From 67280b6fb07ee06757c8d4c61c5e341031bbb3c2 Mon Sep 17 00:00:00 2001
From: David Sherret <dsherret@users.noreply.github.com>
Date: Fri, 3 Dec 2021 21:35:16 -0500
Subject: [PATCH] fix(es/typescript): Run `resolver` before `typescript::strip`
 (#2951)

swc_ecma_transforms_base:
 - `resolver`: Handle some typescript nodes.

swc_ecma_transforms_typescript:
 - `strip`: Use identifier span hygiene information for stripping types.
---
 crates/swc/benches/typescript.rs              |  10 +-
 crates/swc/src/config/mod.rs                  |   6 +-
 .../tests/fixture/issue-1160/output/entry.ts  |   6 +-
 .../fixture/issue-1515/case1/output/input.ts  |   8 +-
 .../tests/fixture/issue-2214/output/index.tsx |   2 +-
 .../input.ts/es2015.1.normal/output.js        |   6 +-
 .../input.ts/es2015.2.minified/output.js      |  10 +-
 .../input.ts/es5.1.normal/output.js           |   2 +-
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 .../input.ts/es2015.1.normal/output.js        |   4 +-
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 .../input.ts/es2015.1.normal/output.js        |   4 +-
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 .../input.ts/es2015.1.normal/output.js        |  12 +-
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 .../input.ts/es2015.1.normal/output.js        |   4 +-
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 .../input.ts/es2015.1.normal/output.js        |  16 +-
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 .../input.ts/es5.1.normal/output.js           |  16 +-
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 .../input.ts/es2015.1.normal/output.js        |  16 +-
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 .../input.ts/es5.1.normal/output.js           |   8 +-
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 .../input.ts/es2015.1.normal/output.js        |  12 +-
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 .../input.ts/es5.1.normal/output.js           |  12 +-
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 .../input.ts/es2015.1.normal/output.js        |  32 +--
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 .../input.ts/es2015.2.minified/output.js      |   4 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   7 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   7 +-
 .../input.ts/es2015.1.normal/output.js        |   8 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   8 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   8 +-
 .../input.ts/es2015.2.minified/output.js      |  12 +-
 .../input.ts/es5.1.normal/output.js           |   8 +-
 .../input.ts/es5.2.minified/output.js         |  16 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   4 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   4 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   8 +-
 .../input.ts/es2015.2.minified/output.js      |  14 +-
 .../input.ts/es5.1.normal/output.js           |   8 +-
 .../input.ts/es5.2.minified/output.js         |  14 +-
 .../input.ts/es2015.1.normal/output.js        |   8 +-
 .../input.ts/es2015.2.minified/output.js      |   8 +-
 .../input.ts/es5.1.normal/output.js           |   8 +-
 .../input.ts/es5.2.minified/output.js         |   8 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   4 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   6 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   6 +-
 .../input.ts/es5.2.minified/output.js         |   4 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |  10 +-
 .../input.ts/es2015.2.minified/output.js      |   8 +-
 .../input.ts/es5.1.normal/output.js           |  10 +-
 .../input.ts/es5.2.minified/output.js         |   8 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |   4 +-
 .../input.ts/es2015.2.minified/output.js      |   6 +-
 .../input.ts/es5.1.normal/output.js           |   4 +-
 .../input.ts/es5.2.minified/output.js         |   6 +-
 .../input.ts/es2015.1.normal/output.js        |  14 +-
 .../input.ts/es2015.2.minified/output.js      |  28 +--
 .../input.ts/es5.1.normal/output.js           |  16 +-
 .../input.ts/es5.2.minified/output.js         |  16 +-
 .../input.ts/es2015.1.normal/output.js        |   8 +-
 .../input.ts/es2015.2.minified/output.js      |   8 +-
 .../input.ts/es5.1.normal/output.js           |   8 +-
 .../input.ts/es5.2.minified/output.js         |   8 +-
 .../input.ts/es2015.1.normal/output.js        |  16 +-
 .../input.ts/es2015.2.minified/output.js      |   8 +-
 .../input.ts/es5.1.normal/output.js           |  16 +-
 .../input.ts/es5.2.minified/output.js         |   8 +-
 crates/swc_bundler/tests/common/mod.rs        |  21 +-
 .../src/compress/optimize/if_return.rs        |   3 +
 .../swc_ecma_transforms/tests/decorators.rs   | 132 +++++------
 .../src/resolver/mod.rs                       |  79 +++----
 .../tests/common_js.rs                        |   2 +-
 .../tests/simplify.rs                         |  24 +-
 .../tests/simplify_dce.rs                     |  66 ++++--
 .../tests/simplify_inlining.rs                |  53 ++++-
 .../benches/compat.rs                         |  14 +-
 .../examples/ts_to_js.rs                      |  21 +-
 .../src/strip.rs                              |  43 +++-
 .../tests/fixture/issue-1653/output.js        |   8 +-
 .../tests/fixture/issue-2234/output.js        |   2 +-
 .../fixture/next/server/render/1/output.js    |  52 ++---
 .../tests/strip.rs                            | 208 +++++++++++++----
 .../tests/strip_correctness.rs                |  20 +-
 crates/swc_estree_compat/benches/babelify.rs  |   8 +-
 crates/swc_node_bundler/benches/bench.rs      |  10 +-
 770 files changed, 3661 insertions(+), 3269 deletions(-)

diff --git a/crates/swc/benches/typescript.rs b/crates/swc/benches/typescript.rs
index 0181cc6fd23..09924612f8a 100644
--- a/crates/swc/benches/typescript.rs
+++ b/crates/swc/benches/typescript.rs
@@ -10,10 +10,10 @@ use std::{
     sync::Arc,
 };
 use swc::config::{Config, IsModule, JscConfig, Options, SourceMapsConfig};
-use swc_common::{errors::Handler, FileName, FilePathMapping, SourceFile, SourceMap};
+use swc_common::{errors::Handler, FileName, FilePathMapping, Mark, SourceFile, SourceMap};
 use swc_ecma_ast::{EsVersion, Program};
 use swc_ecma_parser::{Syntax, TsConfig};
-use swc_ecma_transforms::{fixer, hygiene, resolver, typescript};
+use swc_ecma_transforms::{fixer, hygiene, resolver, resolver_with_mark, typescript};
 use swc_ecma_visit::FoldWith;
 use test::Bencher;
 
@@ -50,8 +50,10 @@ fn parse(c: &swc::Compiler) -> (Arc<SourceFile>, Program) {
 
 fn as_es(c: &swc::Compiler) -> Program {
     let program = parse(c).1;
-
-    program.fold_with(&mut typescript::strip())
+    let mark = Mark::fresh(Mark::root());
+    program
+        .fold_with(&mut resolver_with_mark(mark))
+        .fold_with(&mut typescript::strip(mark))
 }
 
 #[bench]
diff --git a/crates/swc/src/config/mod.rs b/crates/swc/src/config/mod.rs
index 3e38570dcb0..aea8866aa32 100644
--- a/crates/swc/src/config/mod.rs
+++ b/crates/swc/src/config/mod.rs
@@ -365,6 +365,11 @@ impl Options {
                 syntax.decorators()
             ),
             import_assertions(),
+            // Do a resolver pass after decorators as it might
+            // emit runtime declarations and do it before
+            // type stripping as we need to know scope information
+            // for emitting enums and namespaces.
+            resolver_with_mark(top_level_mark),
             Optional::new(
                 typescript::strip_with_jsx(
                     cm.clone(),
@@ -378,7 +383,6 @@ impl Options {
                 ),
                 syntax.typescript()
             ),
-            resolver_with_mark(top_level_mark),
             crate::plugin::plugins(experimental.plugins),
             custom_before_pass(&program),
             // handle jsx
diff --git a/crates/swc/tests/fixture/issue-1160/output/entry.ts b/crates/swc/tests/fixture/issue-1160/output/entry.ts
index ab5ee70eb6a..133bc1d089a 100644
--- a/crates/swc/tests/fixture/issue-1160/output/entry.ts
+++ b/crates/swc/tests/fixture/issue-1160/output/entry.ts
@@ -34,9 +34,9 @@ function _initializerDefineProperty(target, property, descriptor, context) {
 }
 var _class, _descriptor, _dec, _dec1;
 var MyEnum;
-(function(MyEnum1) {
-    MyEnum1["x"] = "xxx";
-    MyEnum1["y"] = "yyy";
+(function(MyEnum) {
+    MyEnum["x"] = "xxx";
+    MyEnum["y"] = "yyy";
 })(MyEnum || (MyEnum = {
 }));
 let Xpto = ((_class = class Xpto {
diff --git a/crates/swc/tests/fixture/issue-1515/case1/output/input.ts b/crates/swc/tests/fixture/issue-1515/case1/output/input.ts
index ebc6430e0d5..aa380e77d7f 100644
--- a/crates/swc/tests/fixture/issue-1515/case1/output/input.ts
+++ b/crates/swc/tests/fixture/issue-1515/case1/output/input.ts
@@ -11,7 +11,7 @@ class ServiceError extends Error {
 }
 exports.ServiceError = ServiceError;
 (function(ServiceError1) {
-    var Code1;
+    let Code;
     (function(Code) {
         Code[Code["serviceNotFound"] = 404] = "serviceNotFound";
         Code[Code["serviceNotCompatible"] = 426] = "serviceNotCompatible";
@@ -20,13 +20,13 @@ exports.ServiceError = ServiceError;
         Code[Code["timedOut"] = 504] = "timedOut";
         Code[Code["badRequest"] = 400] = "badRequest";
         Code[Code["badResponse"] = 422] = "badResponse";
-    })(Code1 || (Code1 = {
+    })(Code || (Code = {
     }));
     class ServiceNotFound extends ServiceError {
         constructor(...args){
             super(...args);
             // Service was probably not registered, or using the wrong channel
-            this.code = Code1.serviceNotFound;
+            this.code = Code.serviceNotFound;
             this.name = "ServiceError.ServiceNotFound";
         }
     }
@@ -37,6 +37,6 @@ exports.ServiceError = ServiceError;
         };
     }
     ServiceError1.toMessageBody = toMessageBody;
-    ServiceError1.Code = Code1;
+    ServiceError1.Code = Code;
 })(ServiceError || (ServiceError = {
 }));
diff --git a/crates/swc/tests/fixture/issue-2214/output/index.tsx b/crates/swc/tests/fixture/issue-2214/output/index.tsx
index 7271315caf7..8319ffd644a 100644
--- a/crates/swc/tests/fixture/issue-2214/output/index.tsx
+++ b/crates/swc/tests/fixture/issue-2214/output/index.tsx
@@ -1,4 +1,4 @@
-import React1 from "react";
+import React from "react";
 export var Test;
 (function(Test1) {
     Test1.content = /*#__PURE__*/ React.createElement("div", null, "Content");
diff --git a/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es2015.1.normal/output.js
index 6cd4d99fab2..17cbb7a22b4 100644
--- a/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es2015.1.normal/output.js
@@ -16,16 +16,16 @@ var N;
 }));
 var O;
 (function(O) {
-    class C2 extends Q1.E2 {
+    class C2 extends Q.E2 {
     } // error
-    var P1;
+    let P1;
     (function(P) {
         class D2 extends C2 {
         }
         P.D2 = D2;
     })(P1 || (P1 = {
     }));
-    var Q1;
+    let Q1;
     (function(Q) {
         class E2 extends P1.D2 {
         }
diff --git a/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es2015.2.minified/output.js
index a3c8dc15ab9..54c7e851507 100644
--- a/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es2015.2.minified/output.js
@@ -9,16 +9,18 @@ class C extends N.E {
     N1.E = E;
 })(N || (N = {
 })), (function(O) {
-    var P, Q1;
-    class C2 extends Q1.E2 {
+    class C2 extends Q.E2 {
     }
+    let P;
     (P || (P = {
     })).D2 = class extends C2 {
-    }, (function(Q) {
+    };
+    let Q1;
+    !function(Q) {
         class E2 extends P.D2 {
         }
         Q.E2 = E2;
-    })(Q1 || (Q1 = {
+    }(Q1 || (Q1 = {
     }));
 })(O || (O = {
 }));
diff --git a/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es5.1.normal/output.js
index c1af9c25f9a..e57b6bb55d3 100644
--- a/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es5.1.normal/output.js
@@ -122,7 +122,7 @@ var O;
         }
         return C2;
     } // error
-    (Q1.E2);
+    (Q.E2);
     var P1;
     (function(P) {
         var D2 = /*#__PURE__*/ function(C2) {
diff --git a/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es5.2.minified/output.js
index f5b950fc6f5..212ae6a69d1 100644
--- a/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/classes/classDeclarations/classHeritageSpecification/classExtendsItselfIndirectly2/input.ts/es5.2.minified/output.js
@@ -87,7 +87,7 @@ var M, N, O, C = function(_E) {
             return _classCallCheck(this, C2), _super.apply(this, arguments);
         }
         return C2;
-    }(Q1.E2);
+    }(Q.E2);
     (function(P) {
         var D2 = function(C2) {
             "use strict";
diff --git a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es2015.1.normal/output.js
index 823a085ab83..530bd8729f1 100644
--- a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es2015.1.normal/output.js
@@ -6,7 +6,7 @@ var x = 1;
 class C {
     constructor(x1){
         this.b // error, evaluated in scope of constructor, cannot reference x
-         = x1;
+         = x;
         x1 = 2; // error, x is string
     }
 }
@@ -14,7 +14,7 @@ var y = 1;
 class D {
     constructor(x){
         this.b // error, evaluated in scope of constructor, cannot reference y
-         = y1;
+         = y;
         var y1 = "";
     }
 }
diff --git a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es5.1.normal/output.js
index 4ceec1369f6..36966011370 100644
--- a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es5.1.normal/output.js
@@ -12,7 +12,7 @@ var C = function C(x1) {
     "use strict";
     _classCallCheck(this, C);
     this.b // error, evaluated in scope of constructor, cannot reference x
-     = x1;
+     = x;
     x1 = 2; // error, x is string
 };
 var y = 1;
@@ -20,6 +20,6 @@ var D = function D(x) {
     "use strict";
     _classCallCheck(this, D);
     this.b // error, evaluated in scope of constructor, cannot reference y
-     = y1;
+     = y;
     var y1 = "";
 };
diff --git a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es5.2.minified/output.js
index 47adde0d627..3c56095df5e 100644
--- a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes/input.ts/es5.2.minified/output.js
@@ -3,9 +3,8 @@ function _classCallCheck(instance, Constructor) {
 }
 var C = function(x) {
     "use strict";
-    _classCallCheck(this, C), this.b = x, x = 2;
+    _classCallCheck(this, C), this.b = 1;
 }, D = function(x) {
     "use strict";
-    _classCallCheck(this, D), this.b = y;
-    var y = "";
+    _classCallCheck(this, D), this.b = 1;
 };
diff --git a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es2015.1.normal/output.js
index b806abeeeed..26938911125 100644
--- a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es2015.1.normal/output.js
@@ -13,19 +13,19 @@ var x = 1;
 class C {
     constructor(x1){
         this.b // ok
-         = x1;
+         = x;
     }
 }
 var y = 1;
 class D {
     constructor(x){
         this.b // ok
-         = y1;
+         = y;
         var y1 = "";
     }
 }
 class E {
-    constructor(z){
+    constructor(z1){
         this.b // not ok
          = z;
     }
diff --git a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es5.1.normal/output.js
index 30e409f3353..2b08202622b 100644
--- a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es5.1.normal/output.js
@@ -19,17 +19,17 @@ var C = function C(x1) {
     "use strict";
     _classCallCheck(this, C);
     this.b // ok
-     = x1;
+     = x;
 };
 var y = 1;
 var D = function D(x) {
     "use strict";
     _classCallCheck(this, D);
     this.b // ok
-     = y1;
+     = y;
     var y1 = "";
 };
-var E = function E(z) {
+var E = function E(z1) {
     "use strict";
     _classCallCheck(this, E);
     this.b // not ok
diff --git a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es5.2.minified/output.js
index cc99cdc6480..43bd128e889 100644
--- a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/constructorParameterShadowsOuterScopes2/input.ts/es5.2.minified/output.js
@@ -3,12 +3,11 @@ function _classCallCheck(instance, Constructor) {
 }
 var C = function(x) {
     "use strict";
-    _classCallCheck(this, C), this.b = x;
+    _classCallCheck(this, C), this.b = 1;
 }, D = function(x) {
     "use strict";
-    _classCallCheck(this, D), this.b = y;
-    var y = "";
-}, E = function(z) {
+    _classCallCheck(this, D), this.b = 1;
+}, E = function(z1) {
     "use strict";
     _classCallCheck(this, E), this.b = z;
 };
diff --git a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es2015.1.normal/output.js
index 25f2754e980..78bd601ec7f 100644
--- a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es2015.1.normal/output.js
@@ -1,13 +1,13 @@
 // Initializer expressions for instance member variables are evaluated in the scope of the class constructor body but are not permitted to reference parameters or local variables of the constructor. 
 class C {
-    constructor(x){
+    constructor(x1){
         this.a // error
          = x;
     }
 }
 class D {
-    constructor(x){
-        this.x = x;
+    constructor(x2){
+        this.x = x2;
         this.a // error
          = x;
     }
@@ -20,8 +20,8 @@ class E {
     }
 }
 class F {
-    constructor(x){
-        this.x = x;
+    constructor(x3){
+        this.x = x3;
         this.a // ok
          = this.x;
         this.b // error
diff --git a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es5.1.normal/output.js
index 7af9169e2f0..fb01ef4234f 100644
--- a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es5.1.normal/output.js
@@ -3,17 +3,17 @@ function _classCallCheck(instance, Constructor) {
         throw new TypeError("Cannot call a class as a function");
     }
 }
-var C = function C(x) {
+var C = function C(x1) {
     "use strict";
     _classCallCheck(this, C);
     // Initializer expressions for instance member variables are evaluated in the scope of the class constructor body but are not permitted to reference parameters or local variables of the constructor. 
     this.a // error
      = x;
 };
-var D = function D(x) {
+var D = function D(x2) {
     "use strict";
     _classCallCheck(this, D);
-    this.x = x;
+    this.x = x2;
     this.a // error
      = x;
 };
@@ -24,10 +24,10 @@ var E = function E(x) {
     this.a // ok
      = this.x;
 };
-var F = function F(x) {
+var F = function F(x3) {
     "use strict";
     _classCallCheck(this, F);
-    this.x = x;
+    this.x = x3;
     this.a // ok
      = this.x;
     this.b // error
diff --git a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es5.2.minified/output.js
index 61df2c9e683..7b7a6b00d13 100644
--- a/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/classes/propertyMemberDeclarations/initializerReferencingConstructorParameters/input.ts/es5.2.minified/output.js
@@ -1,16 +1,16 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-var C = function(x) {
+var C = function(x1) {
     "use strict";
     _classCallCheck(this, C), this.a = x;
-}, D = function(x) {
+}, D = function(x2) {
     "use strict";
-    _classCallCheck(this, D), this.x = x, this.a = x;
+    _classCallCheck(this, D), this.x = x2, this.a = x;
 }, E = function(x) {
     "use strict";
     _classCallCheck(this, E), this.x = x, this.a = this.x;
-}, F = function(x) {
+}, F = function(x3) {
     "use strict";
-    _classCallCheck(this, F), this.x = x, this.a = this.x, this.b = x;
+    _classCallCheck(this, F), this.x = x3, this.a = this.x, this.b = x;
 };
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es2015.1.normal/output.js
index 5de70bb77de..68d1944da66 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es2015.1.normal/output.js
@@ -1,12 +1,12 @@
 var // @target: es5
 E1;
-(function(E11) {
-    E11[E11["x"] = 0] = "x";
+(function(E1) {
+    E1[E1["x"] = 0] = "x";
 })(E1 || (E1 = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["x"] = 0] = "x";
+(function(E2) {
+    E2[E2["x"] = 0] = "x";
 })(E2 || (E2 = {
 }));
 var o = {
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es2015.2.minified/output.js
index 2280b3f45a2..e6bdced7351 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E1, E2, E11, E21;
-(E1 = E11 || (E11 = {
-}))[E1.x = 0] = "x", (E2 = E21 || (E21 = {
-}))[E2.x = 0] = "x", E11.x || E21.x;
+var E1, E2, E1, E2;
+(E1 = E1 || (E1 = {
+}))[E1.x = 0] = "x", (E2 = E2 || (E2 = {
+}))[E2.x = 0] = "x", E1.x || E2.x;
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es5.1.normal/output.js
index 74fa35a3a22..6ba2499d0ae 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es5.1.normal/output.js
@@ -13,13 +13,13 @@ function _defineProperty(obj, key, value) {
 }
 var // @target: es5
 E1;
-(function(E11) {
-    E11[E11["x"] = 0] = "x";
+(function(E1) {
+    E1[E1["x"] = 0] = "x";
 })(E1 || (E1 = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["x"] = 0] = "x";
+(function(E2) {
+    E2[E2["x"] = 0] = "x";
 })(E2 || (E2 = {
 }));
 var o = _defineProperty({
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es5.2.minified/output.js
index 3b06667f287..1f52ee3b48e 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES5/input.ts/es5.2.minified/output.js
@@ -1,8 +1,8 @@
-var E1, E2, obj, key, E11, E21;
-(E1 = E11 || (E11 = {
-}))[E1.x = 0] = "x", (E2 = E21 || (E21 = {
+var E1, E2, obj, key, E1, E2;
+(E1 = E1 || (E1 = {
+}))[E1.x = 0] = "x", (E2 = E2 || (E2 = {
 }))[E2.x = 0] = "x", obj = {
-}, (key = E11.x || E21.x) in obj ? Object.defineProperty(obj, key, {
+}, (key = E1.x || E2.x) in obj ? Object.defineProperty(obj, key, {
     value: 0,
     enumerable: !0,
     configurable: !0,
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es2015.1.normal/output.js
index 6598a065724..43fa0c237ab 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es2015.1.normal/output.js
@@ -1,12 +1,12 @@
 var // @target: es6
 E1;
-(function(E11) {
-    E11[E11["x"] = 0] = "x";
+(function(E1) {
+    E1[E1["x"] = 0] = "x";
 })(E1 || (E1 = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["x"] = 0] = "x";
+(function(E2) {
+    E2[E2["x"] = 0] = "x";
 })(E2 || (E2 = {
 }));
 var o = {
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es2015.2.minified/output.js
index 2280b3f45a2..e6bdced7351 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E1, E2, E11, E21;
-(E1 = E11 || (E11 = {
-}))[E1.x = 0] = "x", (E2 = E21 || (E21 = {
-}))[E2.x = 0] = "x", E11.x || E21.x;
+var E1, E2, E1, E2;
+(E1 = E1 || (E1 = {
+}))[E1.x = 0] = "x", (E2 = E2 || (E2 = {
+}))[E2.x = 0] = "x", E1.x || E2.x;
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es5.1.normal/output.js
index e3b0da28ec8..0b650a3df64 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es5.1.normal/output.js
@@ -13,13 +13,13 @@ function _defineProperty(obj, key, value) {
 }
 var // @target: es6
 E1;
-(function(E11) {
-    E11[E11["x"] = 0] = "x";
+(function(E1) {
+    E1[E1["x"] = 0] = "x";
 })(E1 || (E1 = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["x"] = 0] = "x";
+(function(E2) {
+    E2[E2["x"] = 0] = "x";
 })(E2 || (E2 = {
 }));
 var o = _defineProperty({
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es5.2.minified/output.js
index 3b06667f287..1f52ee3b48e 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames47_ES6/input.ts/es5.2.minified/output.js
@@ -1,8 +1,8 @@
-var E1, E2, obj, key, E11, E21;
-(E1 = E11 || (E11 = {
-}))[E1.x = 0] = "x", (E2 = E21 || (E21 = {
+var E1, E2, obj, key, E1, E2;
+(E1 = E1 || (E1 = {
+}))[E1.x = 0] = "x", (E2 = E2 || (E2 = {
 }))[E2.x = 0] = "x", obj = {
-}, (key = E11.x || E21.x) in obj ? Object.defineProperty(obj, key, {
+}, (key = E1.x || E2.x) in obj ? Object.defineProperty(obj, key, {
     value: 0,
     enumerable: !0,
     configurable: !0,
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es2015.1.normal/output.js
index 398e888f30c..bd2300bb59e 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es2015.1.normal/output.js
@@ -1,6 +1,6 @@
 var E;
-(function(E1) {
-    E1[E1["x"] = 0] = "x";
+(function(E) {
+    E[E["x"] = 0] = "x";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es2015.2.minified/output.js
index eb40b47347d..72e3201c4d7 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var E, a, E1;
-(E1 = E || (E = {
-}))[E1.x = 0] = "x", extractIndexer({
+var E, a, E;
+(E = E || (E = {
+}))[E.x = 0] = "x", extractIndexer({
     [a]: ""
 }), extractIndexer({
     [E.x]: ""
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es5.1.normal/output.js
index 06580cfb5a4..4a6581c042b 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es5.1.normal/output.js
@@ -12,8 +12,8 @@ function _defineProperty(obj, key, value) {
     return obj;
 }
 var E;
-(function(E1) {
-    E1[E1["x"] = 0] = "x";
+(function(E) {
+    E[E["x"] = 0] = "x";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es5.2.minified/output.js
index 81fe6edfac6..65d80ead422 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES5/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, a, E1;
+var E, a, E;
 function _defineProperty(obj, key, value) {
     return key in obj ? Object.defineProperty(obj, key, {
         value: value,
@@ -7,8 +7,8 @@ function _defineProperty(obj, key, value) {
         writable: !0
     }) : obj[key] = value, obj;
 }
-(E1 = E || (E = {
-}))[E1.x = 0] = "x", extractIndexer(_defineProperty({
+(E = E || (E = {
+}))[E.x = 0] = "x", extractIndexer(_defineProperty({
 }, a, "")), extractIndexer(_defineProperty({
 }, E.x, "")), extractIndexer(_defineProperty({
 }, 0, ""));
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es2015.1.normal/output.js
index 398e888f30c..bd2300bb59e 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es2015.1.normal/output.js
@@ -1,6 +1,6 @@
 var E;
-(function(E1) {
-    E1[E1["x"] = 0] = "x";
+(function(E) {
+    E[E["x"] = 0] = "x";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es2015.2.minified/output.js
index eb40b47347d..72e3201c4d7 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var E, a, E1;
-(E1 = E || (E = {
-}))[E1.x = 0] = "x", extractIndexer({
+var E, a, E;
+(E = E || (E = {
+}))[E.x = 0] = "x", extractIndexer({
     [a]: ""
 }), extractIndexer({
     [E.x]: ""
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es5.1.normal/output.js
index 06580cfb5a4..4a6581c042b 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es5.1.normal/output.js
@@ -12,8 +12,8 @@ function _defineProperty(obj, key, value) {
     return obj;
 }
 var E;
-(function(E1) {
-    E1[E1["x"] = 0] = "x";
+(function(E) {
+    E[E["x"] = 0] = "x";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es5.2.minified/output.js
index 81fe6edfac6..65d80ead422 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames48_ES6/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, a, E1;
+var E, a, E;
 function _defineProperty(obj, key, value) {
     return key in obj ? Object.defineProperty(obj, key, {
         value: value,
@@ -7,8 +7,8 @@ function _defineProperty(obj, key, value) {
         writable: !0
     }) : obj[key] = value, obj;
 }
-(E1 = E || (E = {
-}))[E1.x = 0] = "x", extractIndexer(_defineProperty({
+(E = E || (E = {
+}))[E.x = 0] = "x", extractIndexer(_defineProperty({
 }, a, "")), extractIndexer(_defineProperty({
 }, E.x, "")), extractIndexer(_defineProperty({
 }, 0, ""));
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es2015.1.normal/output.js
index f9c397c2bd6..7ae07c1a013 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var // @target: es5
 E;
-(function(E1) {
-    E1[E1["member"] = 0] = "member";
+(function(E) {
+    E[E["member"] = 0] = "member";
 })(E || (E = {
 }));
 var v = {
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es2015.2.minified/output.js
index d9fd953e763..3bd7a9cd67f 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.member = 0] = "member", E.member;
+var E, E;
+(E = E || (E = {
+}))[E.member = 0] = "member", E.member;
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es5.1.normal/output.js
index e38f9727f2c..9db26319fe1 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es5.1.normal/output.js
@@ -13,8 +13,8 @@ function _defineProperty(obj, key, value) {
 }
 var // @target: es5
 E;
-(function(E1) {
-    E1[E1["member"] = 0] = "member";
+(function(E) {
+    E[E["member"] = 0] = "member";
 })(E || (E = {
 }));
 var v = _defineProperty({
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es5.2.minified/output.js
index 23d65d3f2d3..2d42392864b 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES5/input.ts/es5.2.minified/output.js
@@ -1,7 +1,7 @@
-var E, obj, key, E1;
-(E = E1 || (E1 = {
+var E, obj, key, E;
+(E = E || (E = {
 }))[E.member = 0] = "member", obj = {
-}, (key = E1.member) in obj ? Object.defineProperty(obj, key, {
+}, (key = E.member) in obj ? Object.defineProperty(obj, key, {
     value: 0,
     enumerable: !0,
     configurable: !0,
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es2015.1.normal/output.js
index 930c66daffc..1a5c6787e61 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var // @target: es6
 E;
-(function(E1) {
-    E1[E1["member"] = 0] = "member";
+(function(E) {
+    E[E["member"] = 0] = "member";
 })(E || (E = {
 }));
 var v = {
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es2015.2.minified/output.js
index d9fd953e763..3bd7a9cd67f 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.member = 0] = "member", E.member;
+var E, E;
+(E = E || (E = {
+}))[E.member = 0] = "member", E.member;
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es5.1.normal/output.js
index f3ee2c5fdc4..6fd132b925b 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es5.1.normal/output.js
@@ -13,8 +13,8 @@ function _defineProperty(obj, key, value) {
 }
 var // @target: es6
 E;
-(function(E1) {
-    E1[E1["member"] = 0] = "member";
+(function(E) {
+    E[E["member"] = 0] = "member";
 })(E || (E = {
 }));
 var v = _defineProperty({
diff --git a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es5.2.minified/output.js
index 23d65d3f2d3..2d42392864b 100644
--- a/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/computedProperties/computedPropertyNames7_ES6/input.ts/es5.2.minified/output.js
@@ -1,7 +1,7 @@
-var E, obj, key, E1;
-(E = E1 || (E1 = {
+var E, obj, key, E;
+(E = E || (E = {
 }))[E.member = 0] = "member", obj = {
-}, (key = E1.member) in obj ? Object.defineProperty(obj, key, {
+}, (key = E.member) in obj ? Object.defineProperty(obj, key, {
     value: 0,
     enumerable: !0,
     configurable: !0,
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es2015.1.normal/output.js
index 3b5f7fff42a..7c73a1c7536 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var // @target: es5,esnext
 K;
-(function(K1) {
-    K1["a"] = "a";
-    K1["b"] = "b";
+(function(K) {
+    K["a"] = "a";
+    K["b"] = "b";
 })(K || (K = {
 }));
 const { [K.a]: aVal , [K.b]: bVal  } = (()=>{
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es2015.2.minified/output.js
index 88303bf7a93..58fa0a3f68c 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var K, K1;
-(K1 = K || (K = {
-})).a = "a", K1.b = "b";
+var K, K;
+(K = K || (K = {
+})).a = "a", K.b = "b";
 const { [K.a]: aVal , [K.b]: bVal  } = {
     [K.a]: 1,
     [K.b]: 1
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es5.1.normal/output.js
index 8bf727cc078..a740debe435 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es5.1.normal/output.js
@@ -13,9 +13,9 @@ function _defineProperty(obj, key, value) {
 }
 var // @target: es5,esnext
 K;
-(function(K1) {
-    K1["a"] = "a";
-    K1["b"] = "b";
+(function(K) {
+    K["a"] = "a";
+    K["b"] = "b";
 })(K || (K = {
 }));
 var _obj;
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es5.2.minified/output.js
index e79fa2fa984..f3d8c3d4165 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringObjectBindingPatternAndAssignment7/input.ts/es5.2.minified/output.js
@@ -6,8 +6,8 @@ function _defineProperty(obj, key, value) {
         writable: !0
     }) : obj[key] = value, obj;
 }
-(K = K1 || (K1 = {
+(K = K || (K = {
 })).a = "a", K.b = "b";
-var K, K1, _obj, ref = (_defineProperty(_obj = {
-}, K1.a, 1), _defineProperty(_obj, K1.b, 1), _obj), aVal = ref[K1.a], bVal = ref[K1.b];
+var K, K, _obj, ref = (_defineProperty(_obj = {
+}, K.a, 1), _defineProperty(_obj, K.b, 1), _obj), aVal = ref[K.a], bVal = ref[K.b];
 console.log(aVal, bVal);
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es2015.1.normal/output.js
index 134a1d688ce..1edb6b30471 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es2015.1.normal/output.js
@@ -102,8 +102,8 @@ b7([
 ]); // Shouldn't be an error
 var // If the declaration specifies a binding pattern, the parameter type is the implied type of that binding pattern (section 5.1.3)
 Foo;
-(function(Foo1) {
-    Foo1[Foo1["a"] = 0] = "a";
+(function(Foo) {
+    Foo[Foo["a"] = 0] = "a";
 })(Foo || (Foo = {
 }));
 function c0({ z: { x , y: { j  }  }  }) {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es2015.2.minified/output.js
index 3eb7d01ec16..b9d5ec8aebb 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var Foo, Foo1;
+var Foo, Foo;
 function a1([a, b, [[c]]]) {
 }
 function b2(z = null, o = {
@@ -39,8 +39,8 @@ a1([
 }), b2("string", {
     x: 200,
     y: !0
-}), (Foo1 = Foo || (Foo = {
-}))[Foo1.a = 0] = "a", c0({
+}), (Foo = Foo || (Foo = {
+}))[Foo.a = 0] = "a", c0({
     z: {
         x: 1,
         y: {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es5.1.normal/output.js
index 2ec00168618..84405635958 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es5.1.normal/output.js
@@ -160,8 +160,8 @@ b7([
 ]); // Shouldn't be an error
 var // If the declaration specifies a binding pattern, the parameter type is the implied type of that binding pattern (section 5.1.3)
 Foo;
-(function(Foo1) {
-    Foo1[Foo1["a"] = 0] = "a";
+(function(Foo) {
+    Foo[Foo["a"] = 0] = "a";
 })(Foo || (Foo = {
 }));
 function c0(param) {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es5.2.minified/output.js
index 0d997333ddd..d34eb2b4c14 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5/input.ts/es5.2.minified/output.js
@@ -119,7 +119,7 @@ a1([
             !1
         ]
     ]
-]), (Foo = Foo1 || (Foo1 = {
+]), (Foo = Foo || (Foo = {
 }))[Foo.a = 0] = "a", c0({
     z: {
         x: 1,
@@ -164,7 +164,7 @@ a1([
     !1,
     !0
 ]);
-var Foo, Foo1, C2 = function() {
+var Foo, Foo, C2 = function() {
     "use strict";
     function C2() {
         _classCallCheck(this, C2);
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es2015.1.normal/output.js
index c6e9585a8c5..bcd151c3896 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es2015.1.normal/output.js
@@ -103,8 +103,8 @@ b7([
 ]); // Shouldn't be an error
 var // If the declaration specifies a binding pattern, the parameter type is the implied type of that binding pattern (section 5.1.3)
 Foo;
-(function(Foo1) {
-    Foo1[Foo1["a"] = 0] = "a";
+(function(Foo) {
+    Foo[Foo["a"] = 0] = "a";
 })(Foo || (Foo = {
 }));
 function c0({ z: { x , y: { j  }  }  }) {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es2015.2.minified/output.js
index 3eb7d01ec16..b9d5ec8aebb 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var Foo, Foo1;
+var Foo, Foo;
 function a1([a, b, [[c]]]) {
 }
 function b2(z = null, o = {
@@ -39,8 +39,8 @@ a1([
 }), b2("string", {
     x: 200,
     y: !0
-}), (Foo1 = Foo || (Foo = {
-}))[Foo1.a = 0] = "a", c0({
+}), (Foo = Foo || (Foo = {
+}))[Foo.a = 0] = "a", c0({
     z: {
         x: 1,
         y: {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es5.1.normal/output.js
index 7dd62c28ef2..d6b666a72c3 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es5.1.normal/output.js
@@ -161,8 +161,8 @@ b7([
 ]); // Shouldn't be an error
 var // If the declaration specifies a binding pattern, the parameter type is the implied type of that binding pattern (section 5.1.3)
 Foo;
-(function(Foo1) {
-    Foo1[Foo1["a"] = 0] = "a";
+(function(Foo) {
+    Foo[Foo["a"] = 0] = "a";
 })(Foo || (Foo = {
 }));
 function c0(param) {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es5.2.minified/output.js
index 0d997333ddd..d34eb2b4c14 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES5iterable/input.ts/es5.2.minified/output.js
@@ -119,7 +119,7 @@ a1([
             !1
         ]
     ]
-]), (Foo = Foo1 || (Foo1 = {
+]), (Foo = Foo || (Foo = {
 }))[Foo.a = 0] = "a", c0({
     z: {
         x: 1,
@@ -164,7 +164,7 @@ a1([
     !1,
     !0
 ]);
-var Foo, Foo1, C2 = function() {
+var Foo, Foo, C2 = function() {
     "use strict";
     function C2() {
         _classCallCheck(this, C2);
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es2015.1.normal/output.js
index 6d96da698e2..2c6fdc4d2db 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es2015.1.normal/output.js
@@ -87,8 +87,8 @@ b2("string", {
 });
 var // If the declaration specifies a binding pattern, the parameter type is the implied type of that binding pattern (section 5.1.3)
 Foo;
-(function(Foo1) {
-    Foo1[Foo1["a"] = 0] = "a";
+(function(Foo) {
+    Foo[Foo["a"] = 0] = "a";
 })(Foo || (Foo = {
 }));
 function c0({ z: { x , y: { j  }  }  }) {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es2015.2.minified/output.js
index 3eb7d01ec16..b9d5ec8aebb 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var Foo, Foo1;
+var Foo, Foo;
 function a1([a, b, [[c]]]) {
 }
 function b2(z = null, o = {
@@ -39,8 +39,8 @@ a1([
 }), b2("string", {
     x: 200,
     y: !0
-}), (Foo1 = Foo || (Foo = {
-}))[Foo1.a = 0] = "a", c0({
+}), (Foo = Foo || (Foo = {
+}))[Foo.a = 0] = "a", c0({
     z: {
         x: 1,
         y: {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es5.1.normal/output.js
index 8321781acd3..9246f8c5aeb 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es5.1.normal/output.js
@@ -145,8 +145,8 @@ b2("string", {
 });
 var // If the declaration specifies a binding pattern, the parameter type is the implied type of that binding pattern (section 5.1.3)
 Foo;
-(function(Foo1) {
-    Foo1[Foo1["a"] = 0] = "a";
+(function(Foo) {
+    Foo[Foo["a"] = 0] = "a";
 })(Foo || (Foo = {
 }));
 function c0(param) {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es5.2.minified/output.js
index f99f407b1e6..574dc87d767 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration1ES6/input.ts/es5.2.minified/output.js
@@ -83,7 +83,7 @@ a1([
 }), b2("string", {
     x: 200,
     y: !0
-}), (Foo = Foo1 || (Foo1 = {
+}), (Foo = Foo || (Foo = {
 }))[Foo.a = 0] = "a", c0({
     z: {
         x: 1,
@@ -128,7 +128,7 @@ a1([
     !1,
     !0
 ]);
-var Foo, Foo1, C2 = function() {
+var Foo, Foo, C2 = function() {
     "use strict";
     function C2() {
         _classCallCheck(this, C2);
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es2015.1.normal/output.js
index 706c93c0522..3c6c584c6b6 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es2015.1.normal/output.js
@@ -71,15 +71,15 @@ function foo(...a) {
 foo("hello", 1, 2);
 foo("hello", "world");
 var E;
-(function(E2) {
-    E2[E2["a"] = 0] = "a";
-    E2[E2["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var E1;
-(function(E11) {
-    E11[E11["a"] = 0] = "a";
-    E11[E11["b"] = 1] = "b";
+(function(E1) {
+    E1[E1["a"] = 0] = "a";
+    E1[E1["b"] = 1] = "b";
 })(E1 || (E1 = {
 }));
 function foo1(...a) {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es2015.2.minified/output.js
index cd230600e6b..f9a257b8adb 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, E1, E2, E11;
+var E, E1, E, E1;
 function a10([a, b, [[c]], ...x]) {
 }
 function foo(...a) {
@@ -24,6 +24,6 @@ a10([
 ]), a10([
     1,
     2
-]), foo("hello", 1, 2), foo("hello", "world"), (E = E2 || (E2 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E11 || (E11 = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E2.a), foo1(1, 2, 3, E11.a, E2.b);
+]), foo("hello", 1, 2), foo("hello", "world"), (E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E1 || (E1 = {
+}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E.a), foo1(1, 2, 3, E1.a, E.b);
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es5.1.normal/output.js
index 12a5515176a..695ce5a473d 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es5.1.normal/output.js
@@ -141,15 +141,15 @@ function foo() {
 foo("hello", 1, 2);
 foo("hello", "world");
 var E;
-(function(E2) {
-    E2[E2["a"] = 0] = "a";
-    E2[E2["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var E1;
-(function(E11) {
-    E11[E11["a"] = 0] = "a";
-    E11[E11["b"] = 1] = "b";
+(function(E1) {
+    E1[E1["a"] = 0] = "a";
+    E1[E1["b"] = 1] = "b";
 })(E1 || (E1 = {
 }));
 function foo1() {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es5.2.minified/output.js
index 73a4a629559..6c95cc5b64d 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5/input.ts/es5.2.minified/output.js
@@ -41,7 +41,7 @@ function a10(param) {
     var _param = _toArray(param), a = _param[0], b = _param[1], ref = _slicedToArray(_param[2], 1), ref1 = _slicedToArray(ref[0], 1);
     ref1[0], _param.slice(3);
 }
-var E, E1, E2, E11, array = [
+var E, E1, E, E1, array = [
     1,
     2,
     3
@@ -94,6 +94,6 @@ function foo1() {
 })([
     1,
     2
-]), foo("hello", 1, 2), foo("hello", "world"), (E = E2 || (E2 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E11 || (E11 = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E2.a), foo1(1, 2, 3, E11.a, E2.b);
+]), foo("hello", 1, 2), foo("hello", "world"), (E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E1 || (E1 = {
+}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E.a), foo1(1, 2, 3, E1.a, E.b);
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es2015.1.normal/output.js
index 706c93c0522..3c6c584c6b6 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es2015.1.normal/output.js
@@ -71,15 +71,15 @@ function foo(...a) {
 foo("hello", 1, 2);
 foo("hello", "world");
 var E;
-(function(E2) {
-    E2[E2["a"] = 0] = "a";
-    E2[E2["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var E1;
-(function(E11) {
-    E11[E11["a"] = 0] = "a";
-    E11[E11["b"] = 1] = "b";
+(function(E1) {
+    E1[E1["a"] = 0] = "a";
+    E1[E1["b"] = 1] = "b";
 })(E1 || (E1 = {
 }));
 function foo1(...a) {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es2015.2.minified/output.js
index cd230600e6b..f9a257b8adb 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, E1, E2, E11;
+var E, E1, E, E1;
 function a10([a, b, [[c]], ...x]) {
 }
 function foo(...a) {
@@ -24,6 +24,6 @@ a10([
 ]), a10([
     1,
     2
-]), foo("hello", 1, 2), foo("hello", "world"), (E = E2 || (E2 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E11 || (E11 = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E2.a), foo1(1, 2, 3, E11.a, E2.b);
+]), foo("hello", 1, 2), foo("hello", "world"), (E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E1 || (E1 = {
+}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E.a), foo1(1, 2, 3, E1.a, E.b);
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es5.1.normal/output.js
index 12a5515176a..695ce5a473d 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es5.1.normal/output.js
@@ -141,15 +141,15 @@ function foo() {
 foo("hello", 1, 2);
 foo("hello", "world");
 var E;
-(function(E2) {
-    E2[E2["a"] = 0] = "a";
-    E2[E2["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var E1;
-(function(E11) {
-    E11[E11["a"] = 0] = "a";
-    E11[E11["b"] = 1] = "b";
+(function(E1) {
+    E1[E1["a"] = 0] = "a";
+    E1[E1["b"] = 1] = "b";
 })(E1 || (E1 = {
 }));
 function foo1() {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es5.2.minified/output.js
index 73a4a629559..6c95cc5b64d 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES5iterable/input.ts/es5.2.minified/output.js
@@ -41,7 +41,7 @@ function a10(param) {
     var _param = _toArray(param), a = _param[0], b = _param[1], ref = _slicedToArray(_param[2], 1), ref1 = _slicedToArray(ref[0], 1);
     ref1[0], _param.slice(3);
 }
-var E, E1, E2, E11, array = [
+var E, E1, E, E1, array = [
     1,
     2,
     3
@@ -94,6 +94,6 @@ function foo1() {
 })([
     1,
     2
-]), foo("hello", 1, 2), foo("hello", "world"), (E = E2 || (E2 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E11 || (E11 = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E2.a), foo1(1, 2, 3, E11.a, E2.b);
+]), foo("hello", 1, 2), foo("hello", "world"), (E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E1 || (E1 = {
+}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E.a), foo1(1, 2, 3, E1.a, E.b);
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es2015.1.normal/output.js
index 706c93c0522..3c6c584c6b6 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es2015.1.normal/output.js
@@ -71,15 +71,15 @@ function foo(...a) {
 foo("hello", 1, 2);
 foo("hello", "world");
 var E;
-(function(E2) {
-    E2[E2["a"] = 0] = "a";
-    E2[E2["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var E1;
-(function(E11) {
-    E11[E11["a"] = 0] = "a";
-    E11[E11["b"] = 1] = "b";
+(function(E1) {
+    E1[E1["a"] = 0] = "a";
+    E1[E1["b"] = 1] = "b";
 })(E1 || (E1 = {
 }));
 function foo1(...a) {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es2015.2.minified/output.js
index cd230600e6b..f9a257b8adb 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, E1, E2, E11;
+var E, E1, E, E1;
 function a10([a, b, [[c]], ...x]) {
 }
 function foo(...a) {
@@ -24,6 +24,6 @@ a10([
 ]), a10([
     1,
     2
-]), foo("hello", 1, 2), foo("hello", "world"), (E = E2 || (E2 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E11 || (E11 = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E2.a), foo1(1, 2, 3, E11.a, E2.b);
+]), foo("hello", 1, 2), foo("hello", "world"), (E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E1 || (E1 = {
+}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E.a), foo1(1, 2, 3, E1.a, E.b);
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es5.1.normal/output.js
index 12a5515176a..695ce5a473d 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es5.1.normal/output.js
@@ -141,15 +141,15 @@ function foo() {
 foo("hello", 1, 2);
 foo("hello", "world");
 var E;
-(function(E2) {
-    E2[E2["a"] = 0] = "a";
-    E2[E2["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var E1;
-(function(E11) {
-    E11[E11["a"] = 0] = "a";
-    E11[E11["b"] = 1] = "b";
+(function(E1) {
+    E1[E1["a"] = 0] = "a";
+    E1[E1["b"] = 1] = "b";
 })(E1 || (E1 = {
 }));
 function foo1() {
diff --git a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es5.2.minified/output.js
index 73a4a629559..6c95cc5b64d 100644
--- a/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/destructuring/destructuringParameterDeclaration3ES6/input.ts/es5.2.minified/output.js
@@ -41,7 +41,7 @@ function a10(param) {
     var _param = _toArray(param), a = _param[0], b = _param[1], ref = _slicedToArray(_param[2], 1), ref1 = _slicedToArray(ref[0], 1);
     ref1[0], _param.slice(3);
 }
-var E, E1, E2, E11, array = [
+var E, E1, E, E1, array = [
     1,
     2,
     3
@@ -94,6 +94,6 @@ function foo1() {
 })([
     1,
     2
-]), foo("hello", 1, 2), foo("hello", "world"), (E = E2 || (E2 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E11 || (E11 = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E2.a), foo1(1, 2, 3, E11.a, E2.b);
+]), foo("hello", 1, 2), foo("hello", "world"), (E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (E1 = E1 || (E1 = {
+}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", foo1(1, 2, 3, E.a), foo1(1, 2, 3, E1.a, E.b);
diff --git a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es2015.1.normal/output.js
index aee50c5ff91..edce9a5b237 100644
--- a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es2015.1.normal/output.js
@@ -7,8 +7,8 @@ var array = [
     }
 ];
 var E;
-(function(E1) {
-    E1[E1["x"] = 0] = "x";
+(function(E) {
+    E[E["x"] = 0] = "x";
 })(E || (E = {
 }));
 for ({ x , y: y = E.x  } of array){
diff --git a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es2015.2.minified/output.js
index 8f3aa5b0748..c53766ded90 100644
--- a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var x, y, E, E1;
-for ({ x , y: y = E.x  } of ((E1 = E || (E = {
-}))[E1.x = 0] = "x", [
+var x, y, E, E;
+for ({ x , y: y = E.x  } of ((E = E || (E = {
+}))[E.x = 0] = "x", [
     {
         x: "",
         y: !0
diff --git a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es5.1.normal/output.js
index 7c654af55e7..05405b86b6c 100644
--- a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es5.1.normal/output.js
@@ -7,8 +7,8 @@ var array = [
     }
 ];
 var E;
-(function(E1) {
-    E1[E1["x"] = 0] = "x";
+(function(E) {
+    E[E["x"] = 0] = "x";
 })(E || (E = {
 }));
 var _iteratorNormalCompletion = true, _didIteratorError = false, _iteratorError = undefined;
diff --git a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es5.2.minified/output.js
index d54ae4acbcc..fe9ec2664e7 100644
--- a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of47/input.ts/es5.2.minified/output.js
@@ -1,14 +1,14 @@
 var E;
-(E = E1 || (E1 = {
+(E = E || (E = {
 }))[E.x = 0] = "x";
 var _iteratorNormalCompletion = !0, _didIteratorError = !1, _iteratorError = void 0;
 try {
-    for(var E1, _step, _iterator = [
+    for(var E, _step, _iterator = [
         {
             x: "",
             y: !0
         }
-    ][Symbol.iterator](); !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = !0)_step.value.x;
+    ][Symbol.iterator](); !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = !0)_step.value.x, E.x;
 } catch (err) {
     _didIteratorError = !0, _iteratorError = err;
 } finally{
diff --git a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es2015.1.normal/output.js
index f0e488f376e..809e255c891 100644
--- a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es2015.1.normal/output.js
@@ -7,8 +7,8 @@ var array = [
     }
 ];
 var E;
-(function(E1) {
-    E1[E1["x"] = 0] = "x";
+(function(E) {
+    E[E["x"] = 0] = "x";
 })(E || (E = {
 }));
 for ({ x , y =E.x  } of array){
diff --git a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es2015.2.minified/output.js
index a45dca43654..3898b1e1101 100644
--- a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var x, y, E, E1;
-for ({ x , y =E.x  } of ((E1 = E || (E = {
-}))[E1.x = 0] = "x", [
+var x, y, E, E;
+for ({ x , y =E.x  } of ((E = E || (E = {
+}))[E.x = 0] = "x", [
     {
         x: "",
         y: !0
diff --git a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es5.1.normal/output.js
index df7eea64966..e12230bfcf8 100644
--- a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es5.1.normal/output.js
@@ -7,8 +7,8 @@ var array = [
     }
 ];
 var E;
-(function(E1) {
-    E1[E1["x"] = 0] = "x";
+(function(E) {
+    E[E["x"] = 0] = "x";
 })(E || (E = {
 }));
 var _iteratorNormalCompletion = true, _didIteratorError = false, _iteratorError = undefined;
diff --git a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es5.2.minified/output.js
index 246b1f67059..a3b179dd914 100644
--- a/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/for-ofStatements/for-of48/input.ts/es5.2.minified/output.js
@@ -1,14 +1,14 @@
 var E;
-(E = E1 || (E1 = {
+(E = E || (E = {
 }))[E.x = 0] = "x";
 var _iteratorNormalCompletion = !0, _didIteratorError = !1, _iteratorError = void 0;
 try {
-    for(var E1, ref, ref1, _step, _iterator = [
+    for(var E, ref, ref1, _step, _iterator = [
         {
             x: "",
             y: !0
         }
-    ][Symbol.iterator](); !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = !0)(ref = _step.value).x, ref1 = ref.y, void 0 === ref1;
+    ][Symbol.iterator](); !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = !0)(ref = _step.value).x, ref1 = ref.y, void 0 === ref1 && E.x;
 } catch (err) {
     _didIteratorError = !0, _iteratorError = err;
 } finally{
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es2015.1.normal/output.js
index 11059e5b723..2dd42039840 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es2015.1.normal/output.js
@@ -9,17 +9,17 @@ function f() {
 class C {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es2015.2.minified/output.js
index 035d49c6283..6c22055f414 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es2015.2.minified/output.js
@@ -3,14 +3,14 @@ function f() {
 }
 class C {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D1 = D || (D = {
-}))[D1.A = 0] = "A", D1[D1.B = 1] = "B", D1[D1.C = 2] = "C", (function(M1) {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
+}))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
 }));
-var E, D, M, v, E1, D1, a = M.x;
+var E, D, M, v, E, D, a = M.x;
 export { v, f, C, E, D, a };
 export { v, f, C, E, D, a } from "./t1";
 export { v, f, C, E, D, a };
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es5.1.normal/output.js
index b7895f2b785..32348340f70 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es5.1.normal/output.js
@@ -16,17 +16,17 @@ var C = function C() {
     _classCallCheck(this, C);
 };
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es5.2.minified/output.js
index a6551cfa7d9..0686f078cbb 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-amd/input.ts/es5.2.minified/output.js
@@ -1,20 +1,20 @@
 import { I, M, N, T, a } from "./t1";
 function f() {
 }
-var D, E, D1, M, v, E1, C = function() {
+var D, E, D, M, v, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D = D1 || (D1 = {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
 }))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
 }));
 var a = M.x;
-export { v, f, C, E, D1 as D, a };
-export { v, f, C, E, D1 as D, a } from "./t1";
-export { v, f, C, E, D1 as D, a };
+export { v, f, C, E, D, a };
+export { v, f, C, E, D, a } from "./t1";
+export { v, f, C, E, D, a };
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es2015.1.normal/output.js
index a38fe473dea..75179a01c96 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es2015.1.normal/output.js
@@ -9,17 +9,17 @@ function f() {
 class C {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es2015.2.minified/output.js
index 035d49c6283..6c22055f414 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es2015.2.minified/output.js
@@ -3,14 +3,14 @@ function f() {
 }
 class C {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D1 = D || (D = {
-}))[D1.A = 0] = "A", D1[D1.B = 1] = "B", D1[D1.C = 2] = "C", (function(M1) {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
+}))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
 }));
-var E, D, M, v, E1, D1, a = M.x;
+var E, D, M, v, E, D, a = M.x;
 export { v, f, C, E, D, a };
 export { v, f, C, E, D, a } from "./t1";
 export { v, f, C, E, D, a };
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es5.1.normal/output.js
index 92333aa022d..ff505345fa3 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es5.1.normal/output.js
@@ -16,17 +16,17 @@ var C = function C() {
     _classCallCheck(this, C);
 };
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es5.2.minified/output.js
index a6551cfa7d9..0686f078cbb 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1-es6/input.ts/es5.2.minified/output.js
@@ -1,20 +1,20 @@
 import { I, M, N, T, a } from "./t1";
 function f() {
 }
-var D, E, D1, M, v, E1, C = function() {
+var D, E, D, M, v, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D = D1 || (D1 = {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
 }))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
 }));
 var a = M.x;
-export { v, f, C, E, D1 as D, a };
-export { v, f, C, E, D1 as D, a } from "./t1";
-export { v, f, C, E, D1 as D, a };
+export { v, f, C, E, D, a };
+export { v, f, C, E, D, a } from "./t1";
+export { v, f, C, E, D, a };
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es2015.1.normal/output.js
index fcc448656ef..1c81c16ac9e 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es2015.1.normal/output.js
@@ -8,17 +8,17 @@ function f() {
 class C {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es2015.2.minified/output.js
index 035d49c6283..6c22055f414 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es2015.2.minified/output.js
@@ -3,14 +3,14 @@ function f() {
 }
 class C {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D1 = D || (D = {
-}))[D1.A = 0] = "A", D1[D1.B = 1] = "B", D1[D1.C = 2] = "C", (function(M1) {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
+}))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
 }));
-var E, D, M, v, E1, D1, a = M.x;
+var E, D, M, v, E, D, a = M.x;
 export { v, f, C, E, D, a };
 export { v, f, C, E, D, a } from "./t1";
 export { v, f, C, E, D, a };
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es5.1.normal/output.js
index 96af5b9f7cd..5e9d7b935b5 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es5.1.normal/output.js
@@ -15,17 +15,17 @@ var C = function C() {
     _classCallCheck(this, C);
 };
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es5.2.minified/output.js
index a6551cfa7d9..0686f078cbb 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports1/input.ts/es5.2.minified/output.js
@@ -1,20 +1,20 @@
 import { I, M, N, T, a } from "./t1";
 function f() {
 }
-var D, E, D1, M, v, E1, C = function() {
+var D, E, D, M, v, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D = D1 || (D1 = {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
 }))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
 }));
 var a = M.x;
-export { v, f, C, E, D1 as D, a };
-export { v, f, C, E, D1 as D, a } from "./t1";
-export { v, f, C, E, D1 as D, a };
+export { v, f, C, E, D, a };
+export { v, f, C, E, D, a } from "./t1";
+export { v, f, C, E, D, a };
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es2015.1.normal/output.js
index a67ef27ab3a..2aef7851c02 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es2015.1.normal/output.js
@@ -9,17 +9,17 @@ export function f() {
 export class C {
 }
 export var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 export var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 export var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es2015.2.minified/output.js
index 9aae33719ac..83aee72b823 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es2015.2.minified/output.js
@@ -3,15 +3,14 @@ export function f() {
 }
 export class C {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D1 = D || (D = {
-}))[D1.A = 0] = "A", D1[D1.B = 1] = "B", D1[D1.C = 2] = "C", (function(M1) {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
+}))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
 }));
-var E, D, M, v, E1, D1, a = M.x;
-export { E1 as E, D1 as D };
+export var E, D, M, v, E, D, a = M.x;
 export { v as v1, f as f1, C as C1, E as E1, D as D1, a as a1 };
 export { v1 as v, f1 as f, C1 as C, I1 as I, E1 as E, D1 as D, M1 as M, N1 as N, T1 as T, a1 as a } from "./t1";
 export { v, f, C, E, D, a };
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es5.1.normal/output.js
index b9187c1e615..29bc30d701b 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es5.1.normal/output.js
@@ -16,17 +16,17 @@ export var C = function C() {
     _classCallCheck(this, C);
 };
 export var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 export var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 export var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es5.2.minified/output.js
index 6ebde9d4590..29feec95649 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-amd/input.ts/es5.2.minified/output.js
@@ -1,16 +1,15 @@
 import { I1 as I, M1 as M, N1 as N, T1 as T, a1 as a } from "./t1";
 export function f() {
 }
-var E, D, M, v, E1, D1, C = function() {
+export var E, D, M, v, E, D, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-export { E1 as E, D1 as D };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D1 = D || (D = {
-}))[D1.A = 0] = "A", D1[D1.B = 1] = "B", D1[D1.C = 2] = "C", (function(M1) {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
+}))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es2015.1.normal/output.js
index a484a6a5bbf..bfea0a049ce 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es2015.1.normal/output.js
@@ -9,17 +9,17 @@ export function f() {
 export class C {
 }
 export var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 export var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 export var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es2015.2.minified/output.js
index 9aae33719ac..83aee72b823 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es2015.2.minified/output.js
@@ -3,15 +3,14 @@ export function f() {
 }
 export class C {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D1 = D || (D = {
-}))[D1.A = 0] = "A", D1[D1.B = 1] = "B", D1[D1.C = 2] = "C", (function(M1) {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
+}))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
 }));
-var E, D, M, v, E1, D1, a = M.x;
-export { E1 as E, D1 as D };
+export var E, D, M, v, E, D, a = M.x;
 export { v as v1, f as f1, C as C1, E as E1, D as D1, a as a1 };
 export { v1 as v, f1 as f, C1 as C, I1 as I, E1 as E, D1 as D, M1 as M, N1 as N, T1 as T, a1 as a } from "./t1";
 export { v, f, C, E, D, a };
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es5.1.normal/output.js
index b8cff9849da..e784b1b60aa 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es5.1.normal/output.js
@@ -16,17 +16,17 @@ export var C = function C() {
     _classCallCheck(this, C);
 };
 export var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 export var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 export var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es5.2.minified/output.js
index 6ebde9d4590..29feec95649 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3-es6/input.ts/es5.2.minified/output.js
@@ -1,16 +1,15 @@
 import { I1 as I, M1 as M, N1 as N, T1 as T, a1 as a } from "./t1";
 export function f() {
 }
-var E, D, M, v, E1, D1, C = function() {
+export var E, D, M, v, E, D, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-export { E1 as E, D1 as D };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D1 = D || (D = {
-}))[D1.A = 0] = "A", D1[D1.B = 1] = "B", D1[D1.C = 2] = "C", (function(M1) {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
+}))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es2015.1.normal/output.js
index cb0e83e609b..e59cfb73513 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es2015.1.normal/output.js
@@ -8,17 +8,17 @@ export function f() {
 export class C {
 }
 export var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 export var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 export var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es2015.2.minified/output.js
index 9aae33719ac..83aee72b823 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es2015.2.minified/output.js
@@ -3,15 +3,14 @@ export function f() {
 }
 export class C {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D1 = D || (D = {
-}))[D1.A = 0] = "A", D1[D1.B = 1] = "B", D1[D1.C = 2] = "C", (function(M1) {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
+}))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
 }));
-var E, D, M, v, E1, D1, a = M.x;
-export { E1 as E, D1 as D };
+export var E, D, M, v, E, D, a = M.x;
 export { v as v1, f as f1, C as C1, E as E1, D as D1, a as a1 };
 export { v1 as v, f1 as f, C1 as C, I1 as I, E1 as E, D1 as D, M1 as M, N1 as N, T1 as T, a1 as a } from "./t1";
 export { v, f, C, E, D, a };
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es5.1.normal/output.js
index d98465643cd..c731848dc9b 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es5.1.normal/output.js
@@ -15,17 +15,17 @@ export var C = function C() {
     _classCallCheck(this, C);
 };
 export var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 export var D;
-(function(D1) {
-    D1[D1["A"] = 0] = "A";
-    D1[D1["B"] = 1] = "B";
-    D1[D1["C"] = 2] = "C";
+(function(D) {
+    D[D["A"] = 0] = "A";
+    D[D["B"] = 1] = "B";
+    D[D["C"] = 2] = "C";
 })(D || (D = {
 }));
 export var M;
diff --git a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es5.2.minified/output.js
index 6ebde9d4590..29feec95649 100644
--- a/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es6/modules/exportsAndImports3/input.ts/es5.2.minified/output.js
@@ -1,16 +1,15 @@
 import { I1 as I, M1 as M, N1 as N, T1 as T, a1 as a } from "./t1";
 export function f() {
 }
-var E, D, M, v, E1, D1, C = function() {
+export var E, D, M, v, E, D, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-export { E1 as E, D1 as D };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", (D1 = D || (D = {
-}))[D1.A = 0] = "A", D1[D1.B = 1] = "B", D1[D1.C = 2] = "C", (function(M1) {
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", (D = D || (D = {
+}))[D.A = 0] = "A", D[D.B = 1] = "B", D[D.C = 2] = "C", (function(M1) {
     var x;
     M1.x = x;
 })(M || (M = {
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es2015.1.normal/output.js
index c01959528b2..06f91b6d133 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es2015.2.minified/output.js
index dd3a78eeac5..0d89e56da56 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, a, b, c, x1, x2, x3, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", E1[E1.c = 2] = "c", x1 = Math.pow(x1, a) = Math.pow(x1, b), x1 = Math.pow(x1, c) = Math.pow(x1, null), x1 = Math.pow(x1, void 0), x2 = Math.pow(x2, a), x2 = Math.pow(x2, b), x2 = Math.pow(x2, c), x2 = Math.pow(x2, null), x2 = Math.pow(x2, void 0), x3 = Math.pow(x3, a), x3 = Math.pow(x3, b), x3 = Math.pow(x3, c), x3 = Math.pow(x3, null), x3 = Math.pow(x3, void 0);
+var E, a, b, c, x1, x2, x3, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", x1 = Math.pow(x1, a) = Math.pow(x1, b), x1 = Math.pow(x1, c) = Math.pow(x1, null), x1 = Math.pow(x1, void 0), x2 = Math.pow(x2, a), x2 = Math.pow(x2, b), x2 = Math.pow(x2, c), x2 = Math.pow(x2, null), x2 = Math.pow(x2, void 0), x3 = Math.pow(x3, a), x3 = Math.pow(x3, b), x3 = Math.pow(x3, c), x3 = Math.pow(x3, null), x3 = Math.pow(x3, void 0);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es5.1.normal/output.js
index c01959528b2..06f91b6d133 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es5.2.minified/output.js
index dd3a78eeac5..0d89e56da56 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCanBeAssigned1/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, a, b, c, x1, x2, x3, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", E1[E1.c = 2] = "c", x1 = Math.pow(x1, a) = Math.pow(x1, b), x1 = Math.pow(x1, c) = Math.pow(x1, null), x1 = Math.pow(x1, void 0), x2 = Math.pow(x2, a), x2 = Math.pow(x2, b), x2 = Math.pow(x2, c), x2 = Math.pow(x2, null), x2 = Math.pow(x2, void 0), x3 = Math.pow(x3, a), x3 = Math.pow(x3, b), x3 = Math.pow(x3, c), x3 = Math.pow(x3, null), x3 = Math.pow(x3, void 0);
+var E, a, b, c, x1, x2, x3, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", x1 = Math.pow(x1, a) = Math.pow(x1, b), x1 = Math.pow(x1, c) = Math.pow(x1, null), x1 = Math.pow(x1, void 0), x2 = Math.pow(x2, a), x2 = Math.pow(x2, b), x2 = Math.pow(x2, c), x2 = Math.pow(x2, null), x2 = Math.pow(x2, void 0), x3 = Math.pow(x3, a), x3 = Math.pow(x3, b), x3 = Math.pow(x3, c), x3 = Math.pow(x3, null), x3 = Math.pow(x3, void 0);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es2015.1.normal/output.js
index 9eb1d5c11ff..a17ad068022 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es2015.2.minified/output.js
index 188f191b3cb..f696fcf0d87 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var E, a, b, x1, x2, x3, x4, x5, x6, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", x1 = Math.pow(x1, a) = Math.pow(x1, b), x1 = Math.pow(x1, !0) = Math.pow(x1, 0), x1 = Math.pow(x1, "") = Math.pow(x1, E.a), x1 = Math.pow(x1, {
+var E, a, b, x1, x2, x3, x4, x5, x6, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", x1 = Math.pow(x1, a) = Math.pow(x1, b), x1 = Math.pow(x1, !0) = Math.pow(x1, 0), x1 = Math.pow(x1, "") = Math.pow(x1, E.a), x1 = Math.pow(x1, {
 }) = Math.pow(x1, null), x1 = Math.pow(x1, void 0), x2 = Math.pow(x2, a), x2 = Math.pow(x2, b), x2 = Math.pow(x2, !0), x2 = Math.pow(x2, 0), x2 = Math.pow(x2, ""), x2 = Math.pow(x2, E.a), x2 = Math.pow(x2, {
 }), x2 = Math.pow(x2, null), x2 = Math.pow(x2, void 0), x3 = Math.pow(x3, a), x3 = Math.pow(x3, b), x3 = Math.pow(x3, !0), x3 = Math.pow(x3, 0), x3 = Math.pow(x3, ""), x3 = Math.pow(x3, E.a), x3 = Math.pow(x3, {
 }), x3 = Math.pow(x3, null), x3 = Math.pow(x3, void 0), x4 = Math.pow(x4, a), x4 = Math.pow(x4, b), x4 = Math.pow(x4, !0), x4 = Math.pow(x4, 0), x4 = Math.pow(x4, ""), x4 = Math.pow(x4, E.a), x4 = Math.pow(x4, {
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es5.1.normal/output.js
index 9eb1d5c11ff..a17ad068022 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es5.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es5.2.minified/output.js
index 188f191b3cb..f696fcf0d87 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/compoundExponentiationAssignmentLHSCannotBeAssigned/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-var E, a, b, x1, x2, x3, x4, x5, x6, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", x1 = Math.pow(x1, a) = Math.pow(x1, b), x1 = Math.pow(x1, !0) = Math.pow(x1, 0), x1 = Math.pow(x1, "") = Math.pow(x1, E.a), x1 = Math.pow(x1, {
+var E, a, b, x1, x2, x3, x4, x5, x6, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", x1 = Math.pow(x1, a) = Math.pow(x1, b), x1 = Math.pow(x1, !0) = Math.pow(x1, 0), x1 = Math.pow(x1, "") = Math.pow(x1, E.a), x1 = Math.pow(x1, {
 }) = Math.pow(x1, null), x1 = Math.pow(x1, void 0), x2 = Math.pow(x2, a), x2 = Math.pow(x2, b), x2 = Math.pow(x2, !0), x2 = Math.pow(x2, 0), x2 = Math.pow(x2, ""), x2 = Math.pow(x2, E.a), x2 = Math.pow(x2, {
 }), x2 = Math.pow(x2, null), x2 = Math.pow(x2, void 0), x3 = Math.pow(x3, a), x3 = Math.pow(x3, b), x3 = Math.pow(x3, !0), x3 = Math.pow(x3, 0), x3 = Math.pow(x3, ""), x3 = Math.pow(x3, E.a), x3 = Math.pow(x3, {
 }), x3 = Math.pow(x3, null), x3 = Math.pow(x3, void 0), x4 = Math.pow(x4, a), x4 = Math.pow(x4, b), x4 = Math.pow(x4, !0), x4 = Math.pow(x4, 0), x4 = Math.pow(x4, ""), x4 = Math.pow(x4, E.a), x4 = Math.pow(x4, {
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es2015.1.normal/output.js
index 7d6aedd2c02..ca1ce3acf2b 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var // operands of an enum type are treated as having the primitive type Number.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es2015.2.minified/output.js
index 89382f72fdf..2df93e78279 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, c;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(c, a), Math.pow(c, b), Math.pow(E1.a, a), Math.pow(E1.a, b), Math.pow(E1.a, E1.b), Math.pow(E1.a, 1), Math.pow(a, E1.b), Math.pow(b, E1.b), Math.pow(1, E1.b);
+var E, E, a, b, c;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(c, a), Math.pow(c, b), Math.pow(E.a, a), Math.pow(E.a, b), Math.pow(E.a, E.b), Math.pow(E.a, 1), Math.pow(a, E.b), Math.pow(b, E.b), Math.pow(1, E.b);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es5.1.normal/output.js
index 7d6aedd2c02..ca1ce3acf2b 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var // operands of an enum type are treated as having the primitive type Number.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es5.2.minified/output.js
index 89382f72fdf..2df93e78279 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnum/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, c;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(c, a), Math.pow(c, b), Math.pow(E1.a, a), Math.pow(E1.a, b), Math.pow(E1.a, E1.b), Math.pow(E1.a, 1), Math.pow(a, E1.b), Math.pow(b, E1.b), Math.pow(1, E1.b);
+var E, E, a, b, c;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(c, a), Math.pow(c, b), Math.pow(E.a, a), Math.pow(E.a, b), Math.pow(E.a, E.b), Math.pow(E.a, 1), Math.pow(a, E.b), Math.pow(b, E.b), Math.pow(1, E.b);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es2015.1.normal/output.js
index 32abe8adf2b..4fd24a61af3 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es2015.1.normal/output.js
@@ -1,14 +1,14 @@
 var // operands of an enum type are treated as having the primitive type Number.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var F;
-(function(F1) {
-    F1[F1["c"] = 0] = "c";
-    F1[F1["d"] = 1] = "d";
+(function(F) {
+    F[F["c"] = 0] = "c";
+    F[F["d"] = 1] = "d";
 })(F || (F = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es2015.2.minified/output.js
index 1a26b433dfe..673f35ceec5 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, F, E1, F1, a, b, c;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F1 || (F1 = {
-}))[F.c = 0] = "c", F[F.d = 1] = "d", Math.pow(c, a), Math.pow(c, b), Math.pow(E1.a, a), Math.pow(E1.a, b), Math.pow(E1.a, E1.b), Math.pow(E1.a, 1), Math.pow(a, E1.b), Math.pow(b, E1.b), Math.pow(1, E1.b);
+var E, F, E, F, a, b, c;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F || (F = {
+}))[F.c = 0] = "c", F[F.d = 1] = "d", Math.pow(c, a), Math.pow(c, b), Math.pow(E.a, a), Math.pow(E.a, b), Math.pow(E.a, E.b), Math.pow(E.a, 1), Math.pow(a, E.b), Math.pow(b, E.b), Math.pow(1, E.b);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es5.1.normal/output.js
index 32abe8adf2b..4fd24a61af3 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es5.1.normal/output.js
@@ -1,14 +1,14 @@
 var // operands of an enum type are treated as having the primitive type Number.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var F;
-(function(F1) {
-    F1[F1["c"] = 0] = "c";
-    F1[F1["d"] = 1] = "d";
+(function(F) {
+    F[F["c"] = 0] = "c";
+    F[F["d"] = 1] = "d";
 })(F || (F = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es5.2.minified/output.js
index 1a26b433dfe..673f35ceec5 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithEnumUnion/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, F, E1, F1, a, b, c;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F1 || (F1 = {
-}))[F.c = 0] = "c", F[F.d = 1] = "d", Math.pow(c, a), Math.pow(c, b), Math.pow(E1.a, a), Math.pow(E1.a, b), Math.pow(E1.a, E1.b), Math.pow(E1.a, 1), Math.pow(a, E1.b), Math.pow(b, E1.b), Math.pow(1, E1.b);
+var E, F, E, F, a, b, c;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F || (F = {
+}))[F.c = 0] = "c", F[F.d = 1] = "d", Math.pow(c, a), Math.pow(c, b), Math.pow(E.a, a), Math.pow(E.a, b), Math.pow(E.a, E.b), Math.pow(E.a, 1), Math.pow(a, E.b), Math.pow(b, E.b), Math.pow(1, E.b);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
index 1c5b10c6fa0..da21a7b1afd 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
@@ -1,10 +1,10 @@
 var // these operators require their operands to be of type Any, the Number primitive type, or
 // an enum type
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
index ba3d8fe48a3..fbde11f508c 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, c, d, e, f;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", Math.pow(a, a), Math.pow(a, b), Math.pow(E1.a, a), Math.pow(E1.a, b), Math.pow(E1.a, c), Math.pow(E1.a, d), Math.pow(E1.a, e), Math.pow(E1.a, f), Math.pow(a, E1.b), Math.pow(b, E1.b), Math.pow(c, E1.b), Math.pow(d, E1.b), Math.pow(e, E1.b), Math.pow(f, E1.b);
+var E, E, a, b, c, d, e, f;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", Math.pow(a, a), Math.pow(a, b), Math.pow(E.a, a), Math.pow(E.a, b), Math.pow(E.a, c), Math.pow(E.a, d), Math.pow(E.a, e), Math.pow(E.a, f), Math.pow(a, E.b), Math.pow(b, E.b), Math.pow(c, E.b), Math.pow(d, E.b), Math.pow(e, E.b), Math.pow(f, E.b);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
index 1c5b10c6fa0..da21a7b1afd 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
@@ -1,10 +1,10 @@
 var // these operators require their operands to be of type Any, the Number primitive type, or
 // an enum type
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
index ba3d8fe48a3..fbde11f508c 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, c, d, e, f;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", Math.pow(a, a), Math.pow(a, b), Math.pow(E1.a, a), Math.pow(E1.a, b), Math.pow(E1.a, c), Math.pow(E1.a, d), Math.pow(E1.a, e), Math.pow(E1.a, f), Math.pow(a, E1.b), Math.pow(b, E1.b), Math.pow(c, E1.b), Math.pow(d, E1.b), Math.pow(e, E1.b), Math.pow(f, E1.b);
+var E, E, a, b, c, d, e, f;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", Math.pow(a, a), Math.pow(a, b), Math.pow(E.a, a), Math.pow(E.a, b), Math.pow(E.a, c), Math.pow(E.a, d), Math.pow(E.a, e), Math.pow(E.a, f), Math.pow(a, E.b), Math.pow(b, E.b), Math.pow(c, E.b), Math.pow(d, E.b), Math.pow(e, E.b), Math.pow(f, E.b);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es2015.1.normal/output.js
index ac8d8e8d22d..f9da523358f 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the null or undefined value, it is treated as having the type of the
 // other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es2015.2.minified/output.js
index 13a9d69ef6d..400154f735a 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(null, a), Math.pow(null, b), Math.pow(null, E1.a), Math.pow(E1.b, null);
+var E, E, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(null, a), Math.pow(null, b), Math.pow(null, E.a), Math.pow(E.b, null);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es5.1.normal/output.js
index ac8d8e8d22d..f9da523358f 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the null or undefined value, it is treated as having the type of the
 // other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es5.2.minified/output.js
index 13a9d69ef6d..400154f735a 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithNullValueAndValidOperands/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(null, a), Math.pow(null, b), Math.pow(null, E1.a), Math.pow(E1.b, null);
+var E, E, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(null, a), Math.pow(null, b), Math.pow(null, E.a), Math.pow(E.b, null);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.1.normal/output.js
index b765972338b..240e0d837ad 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the undefined or undefined value, it is treated as having the type of the
 // other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.2.minified/output.js
index f95a3d0b556..d5fbb944fec 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(void 0, a), Math.pow(void 0, b), Math.pow(void 0, E1.a), Math.pow(E1.b, void 0);
+var E, E, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(void 0, a), Math.pow(void 0, b), Math.pow(void 0, E.a), Math.pow(E.b, void 0);
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es5.1.normal/output.js
index b765972338b..240e0d837ad 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the undefined or undefined value, it is treated as having the type of the
 // other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es5.2.minified/output.js
index f95a3d0b556..d5fbb944fec 100644
--- a/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/es7/exponentiationOperator/exponentiationOperatorWithUndefinedValueAndValidOperands/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(void 0, a), Math.pow(void 0, b), Math.pow(void 0, E1.a), Math.pow(E1.b, void 0);
+var E, E, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", Math.pow(void 0, a), Math.pow(void 0, b), Math.pow(void 0, E.a), Math.pow(E.b, void 0);
diff --git a/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es2015.1.normal/output.js
index 2360b0ac600..8767b72dc11 100644
--- a/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es2015.1.normal/output.js
@@ -1,23 +1,23 @@
 export var AppType;
-(function(AppType1) {
-    AppType1["HeaderDetail"] = "HeaderDetail";
-    AppType1["HeaderMultiDetail"] = "HeaderMultiDetail";
-    AppType1["AdvancedList"] = "AdvancedList";
-    AppType1["Standard"] = "Standard";
-    AppType1["Relationship"] = "Relationship";
-    AppType1["Report"] = "Report";
-    AppType1["Composite"] = "Composite";
-    AppType1["ListOnly"] = "ListOnly";
-    AppType1["ModuleSettings"] = "ModuleSettings";
+(function(AppType) {
+    AppType["HeaderDetail"] = "HeaderDetail";
+    AppType["HeaderMultiDetail"] = "HeaderMultiDetail";
+    AppType["AdvancedList"] = "AdvancedList";
+    AppType["Standard"] = "Standard";
+    AppType["Relationship"] = "Relationship";
+    AppType["Report"] = "Report";
+    AppType["Composite"] = "Composite";
+    AppType["ListOnly"] = "ListOnly";
+    AppType["ModuleSettings"] = "ModuleSettings";
 })(AppType || (AppType = {
 }));
 export var AppStyle;
-(function(AppStyle1) {
-    AppStyle1[AppStyle1["Tree"] = 0] = "Tree";
-    AppStyle1[AppStyle1["TreeEntity"] = 1] = "TreeEntity";
-    AppStyle1[AppStyle1["Standard"] = 2] = "Standard";
-    AppStyle1[AppStyle1["MiniApp"] = 3] = "MiniApp";
-    AppStyle1[AppStyle1["PivotTable"] = 4] = "PivotTable";
+(function(AppStyle) {
+    AppStyle[AppStyle["Tree"] = 0] = "Tree";
+    AppStyle[AppStyle["TreeEntity"] = 1] = "TreeEntity";
+    AppStyle[AppStyle["Standard"] = 2] = "Standard";
+    AppStyle[AppStyle["MiniApp"] = 3] = "MiniApp";
+    AppStyle[AppStyle["PivotTable"] = 4] = "PivotTable";
 })(AppStyle || (AppStyle = {
 }));
 const appTypeStylesWithError = new Map([
diff --git a/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es2015.2.minified/output.js
index a436fd794a6..2a2426c935a 100644
--- a/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es2015.2.minified/output.js
@@ -1,7 +1,7 @@
-var AppType, AppStyle, AppType1, AppStyle1;
-(AppType1 = AppType || (AppType = {
-})).HeaderDetail = "HeaderDetail", AppType1.HeaderMultiDetail = "HeaderMultiDetail", AppType1.AdvancedList = "AdvancedList", AppType1.Standard = "Standard", AppType1.Relationship = "Relationship", AppType1.Report = "Report", AppType1.Composite = "Composite", AppType1.ListOnly = "ListOnly", AppType1.ModuleSettings = "ModuleSettings", (AppStyle1 = AppStyle || (AppStyle = {
-}))[AppStyle1.Tree = 0] = "Tree", AppStyle1[AppStyle1.TreeEntity = 1] = "TreeEntity", AppStyle1[AppStyle1.Standard = 2] = "Standard", AppStyle1[AppStyle1.MiniApp = 3] = "MiniApp", AppStyle1[AppStyle1.PivotTable = 4] = "PivotTable", new Map([
+var AppType, AppStyle, AppType, AppStyle;
+(AppType = AppType || (AppType = {
+})).HeaderDetail = "HeaderDetail", AppType.HeaderMultiDetail = "HeaderMultiDetail", AppType.AdvancedList = "AdvancedList", AppType.Standard = "Standard", AppType.Relationship = "Relationship", AppType.Report = "Report", AppType.Composite = "Composite", AppType.ListOnly = "ListOnly", AppType.ModuleSettings = "ModuleSettings", (AppStyle = AppStyle || (AppStyle = {
+}))[AppStyle.Tree = 0] = "Tree", AppStyle[AppStyle.TreeEntity = 1] = "TreeEntity", AppStyle[AppStyle.Standard = 2] = "Standard", AppStyle[AppStyle.MiniApp = 3] = "MiniApp", AppStyle[AppStyle.PivotTable = 4] = "PivotTable", new Map([
     [
         AppType.Standard,
         [
diff --git a/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es5.1.normal/output.js
index 2797085ff69..b286fe4c24a 100644
--- a/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es5.1.normal/output.js
@@ -1,23 +1,23 @@
 export var AppType;
-(function(AppType1) {
-    AppType1["HeaderDetail"] = "HeaderDetail";
-    AppType1["HeaderMultiDetail"] = "HeaderMultiDetail";
-    AppType1["AdvancedList"] = "AdvancedList";
-    AppType1["Standard"] = "Standard";
-    AppType1["Relationship"] = "Relationship";
-    AppType1["Report"] = "Report";
-    AppType1["Composite"] = "Composite";
-    AppType1["ListOnly"] = "ListOnly";
-    AppType1["ModuleSettings"] = "ModuleSettings";
+(function(AppType) {
+    AppType["HeaderDetail"] = "HeaderDetail";
+    AppType["HeaderMultiDetail"] = "HeaderMultiDetail";
+    AppType["AdvancedList"] = "AdvancedList";
+    AppType["Standard"] = "Standard";
+    AppType["Relationship"] = "Relationship";
+    AppType["Report"] = "Report";
+    AppType["Composite"] = "Composite";
+    AppType["ListOnly"] = "ListOnly";
+    AppType["ModuleSettings"] = "ModuleSettings";
 })(AppType || (AppType = {
 }));
 export var AppStyle;
-(function(AppStyle1) {
-    AppStyle1[AppStyle1["Tree"] = 0] = "Tree";
-    AppStyle1[AppStyle1["TreeEntity"] = 1] = "TreeEntity";
-    AppStyle1[AppStyle1["Standard"] = 2] = "Standard";
-    AppStyle1[AppStyle1["MiniApp"] = 3] = "MiniApp";
-    AppStyle1[AppStyle1["PivotTable"] = 4] = "PivotTable";
+(function(AppStyle) {
+    AppStyle[AppStyle["Tree"] = 0] = "Tree";
+    AppStyle[AppStyle["TreeEntity"] = 1] = "TreeEntity";
+    AppStyle[AppStyle["Standard"] = 2] = "Standard";
+    AppStyle[AppStyle["MiniApp"] = 3] = "MiniApp";
+    AppStyle[AppStyle["PivotTable"] = 4] = "PivotTable";
 })(AppStyle || (AppStyle = {
 }));
 var appTypeStylesWithError = new Map([
diff --git a/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es5.2.minified/output.js
index eb988881f41..2a2426c935a 100644
--- a/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/arrayLiterals/arrayLiteralInference/input.ts/es5.2.minified/output.js
@@ -1,27 +1,27 @@
-var AppType, AppStyle, AppType1, AppStyle1;
-(AppType = AppType1 || (AppType1 = {
-})).HeaderDetail = "HeaderDetail", AppType.HeaderMultiDetail = "HeaderMultiDetail", AppType.AdvancedList = "AdvancedList", AppType.Standard = "Standard", AppType.Relationship = "Relationship", AppType.Report = "Report", AppType.Composite = "Composite", AppType.ListOnly = "ListOnly", AppType.ModuleSettings = "ModuleSettings", (AppStyle = AppStyle1 || (AppStyle1 = {
+var AppType, AppStyle, AppType, AppStyle;
+(AppType = AppType || (AppType = {
+})).HeaderDetail = "HeaderDetail", AppType.HeaderMultiDetail = "HeaderMultiDetail", AppType.AdvancedList = "AdvancedList", AppType.Standard = "Standard", AppType.Relationship = "Relationship", AppType.Report = "Report", AppType.Composite = "Composite", AppType.ListOnly = "ListOnly", AppType.ModuleSettings = "ModuleSettings", (AppStyle = AppStyle || (AppStyle = {
 }))[AppStyle.Tree = 0] = "Tree", AppStyle[AppStyle.TreeEntity = 1] = "TreeEntity", AppStyle[AppStyle.Standard = 2] = "Standard", AppStyle[AppStyle.MiniApp = 3] = "MiniApp", AppStyle[AppStyle.PivotTable = 4] = "PivotTable", new Map([
     [
-        AppType1.Standard,
+        AppType.Standard,
         [
-            AppStyle1.Standard,
-            AppStyle1.MiniApp
+            AppStyle.Standard,
+            AppStyle.MiniApp
         ]
     ],
     [
-        AppType1.Relationship,
+        AppType.Relationship,
         [
-            AppStyle1.Standard,
-            AppStyle1.Tree,
-            AppStyle1.TreeEntity
+            AppStyle.Standard,
+            AppStyle.Tree,
+            AppStyle.TreeEntity
         ]
     ],
     [
-        AppType1.AdvancedList,
+        AppType.AdvancedList,
         [
-            AppStyle1.Standard,
-            AppStyle1.MiniApp
+            AppStyle.Standard,
+            AppStyle.MiniApp
         ]
     ]
 ]), foo({
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es2015.1.normal/output.js
index 2abc00883be..34af0ef3097 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es2015.2.minified/output.js
index c6ea6ecdb47..f3e2e5de102 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-var E, a, b, x1, x2, x3, x4, x5, x6, x7, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", x1 += a, x1 += b, x1 += !0, x1 += 0, x1 += "", x1 += E.a, x1 += {
+var E, a, b, x1, x2, x3, x4, x5, x6, x7, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", x1 += a, x1 += b, x1 += !0, x1 += 0, x1 += "", x1 += E.a, x1 += {
 }, x1 += null, x1 += void 0, x2 += a, x2 += b, x2 += !0, x2 += 0, x2 += "", x2 += E.a, x2 += {
 }, x2 += null, x2 += void 0, x3 += a, x3 += 0, x3 += E.a, x3 += null, x3 += void 0, x4 += a, x4 += 0, x4 += E.a, x4 += null, x4 += void 0, x5 += a, x6 += a, x6 += "", x7 += a;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es5.1.normal/output.js
index 2abc00883be..34af0ef3097 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es5.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es5.2.minified/output.js
index c6ea6ecdb47..f3e2e5de102 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCanBeAssigned/input.ts/es5.2.minified/output.js
@@ -1,5 +1,5 @@
-var E, a, b, x1, x2, x3, x4, x5, x6, x7, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", x1 += a, x1 += b, x1 += !0, x1 += 0, x1 += "", x1 += E.a, x1 += {
+var E, a, b, x1, x2, x3, x4, x5, x6, x7, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", x1 += a, x1 += b, x1 += !0, x1 += 0, x1 += "", x1 += E.a, x1 += {
 }, x1 += null, x1 += void 0, x2 += a, x2 += b, x2 += !0, x2 += 0, x2 += "", x2 += E.a, x2 += {
 }, x2 += null, x2 += void 0, x3 += a, x3 += 0, x3 += E.a, x3 += null, x3 += void 0, x4 += a, x4 += 0, x4 += E.a, x4 += null, x4 += void 0, x5 += a, x6 += a, x6 += "", x7 += a;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es2015.1.normal/output.js
index 066e9e0d2f2..843a3c473a1 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // string can add every type, and result string cannot be assigned to below types
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var x1;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es2015.2.minified/output.js
index 84246a37c48..c7ef61e1146 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, x1, x2, x3, x4, x5, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", E1[E1.c = 2] = "c", x1 += "", x2 += "", x3 += "", x4 += "", x5 += "";
+var E, x1, x2, x3, x4, x5, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", x1 += "", x2 += "", x3 += "", x4 += "", x5 += "";
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es5.1.normal/output.js
index 066e9e0d2f2..843a3c473a1 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // string can add every type, and result string cannot be assigned to below types
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var x1;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es5.2.minified/output.js
index 84246a37c48..c7ef61e1146 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentLHSCannotBeAssigned/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, x1, x2, x3, x4, x5, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", E1[E1.c = 2] = "c", x1 += "", x2 += "", x3 += "", x4 += "", x5 += "";
+var E, x1, x2, x3, x4, x5, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", x1 += "", x2 += "", x3 += "", x4 += "", x5 += "";
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es2015.1.normal/output.js
index 333923a6d37..c61571075aa 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es2015.2.minified/output.js
index e0745a5a5bc..5e0ffdae831 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var E, a, x1, x2, x3, x4, x5, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", x1 += a, x1 += !0, x1 += 0, x1 += E.a, x1 += {
+var E, a, x1, x2, x3, x4, x5, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", x1 += a, x1 += !0, x1 += 0, x1 += E.a, x1 += {
 }, x1 += null, x1 += void 0, x2 += a, x2 += !0, x2 += 0, x2 += E.a, x2 += {
 }, x2 += null, x2 += void 0, x3 += a, x3 += !0, x3 += 0, x3 += E.a, x3 += {
 }, x3 += null, x3 += void 0, x4 += a, x4 += !0, x4 += {
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es5.1.normal/output.js
index 333923a6d37..c61571075aa 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es5.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es5.2.minified/output.js
index e0745a5a5bc..5e0ffdae831 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundAdditionAssignmentWithInvalidOperands/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-var E, a, x1, x2, x3, x4, x5, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", x1 += a, x1 += !0, x1 += 0, x1 += E.a, x1 += {
+var E, a, x1, x2, x3, x4, x5, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", x1 += a, x1 += !0, x1 += 0, x1 += E.a, x1 += {
 }, x1 += null, x1 += void 0, x2 += a, x2 += !0, x2 += 0, x2 += E.a, x2 += {
 }, x2 += null, x2 += void 0, x3 += a, x3 += !0, x3 += 0, x3 += E.a, x3 += {
 }, x3 += null, x3 += void 0, x4 += a, x4 += !0, x4 += {
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es2015.1.normal/output.js
index ceb0a352d2f..f41b8357ca4 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es2015.2.minified/output.js
index ac040737e62..fa0cdb45a5a 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, a, b, c, x1, x2, x3, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", E1[E1.c = 2] = "c", x1 *= a, x1 *= b, x1 *= c, x1 *= null, x1 *= void 0, x2 *= a, x2 *= b, x2 *= c, x2 *= null, x2 *= void 0, x3 *= a, x3 *= b, x3 *= c, x3 *= null, x3 *= void 0;
+var E, a, b, c, x1, x2, x3, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", x1 *= a, x1 *= b, x1 *= c, x1 *= null, x1 *= void 0, x2 *= a, x2 *= b, x2 *= c, x2 *= null, x2 *= void 0, x3 *= a, x3 *= b, x3 *= c, x3 *= null, x3 *= void 0;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es5.1.normal/output.js
index ceb0a352d2f..f41b8357ca4 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es5.2.minified/output.js
index ac040737e62..fa0cdb45a5a 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentLHSCanBeAssigned/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, a, b, c, x1, x2, x3, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", E1[E1.c = 2] = "c", x1 *= a, x1 *= b, x1 *= c, x1 *= null, x1 *= void 0, x2 *= a, x2 *= b, x2 *= c, x2 *= null, x2 *= void 0, x3 *= a, x3 *= b, x3 *= c, x3 *= null, x3 *= void 0;
+var E, a, b, c, x1, x2, x3, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", x1 *= a, x1 *= b, x1 *= c, x1 *= null, x1 *= void 0, x2 *= a, x2 *= b, x2 *= c, x2 *= null, x2 *= void 0, x3 *= a, x3 *= b, x3 *= c, x3 *= null, x3 *= void 0;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es2015.1.normal/output.js
index 908ee58a3ca..58f91e84c0b 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es2015.2.minified/output.js
index 2366c2a95b0..556c415d8e7 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var E, a, b, x1, x2, x3, x4, x5, x6, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", x1 *= a, x1 *= b, x1 *= !0, x1 *= 0, x1 *= "", x1 *= E.a, x1 *= {
+var E, a, b, x1, x2, x3, x4, x5, x6, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", x1 *= a, x1 *= b, x1 *= !0, x1 *= 0, x1 *= "", x1 *= E.a, x1 *= {
 }, x1 *= null, x1 *= void 0, x2 *= a, x2 *= b, x2 *= !0, x2 *= 0, x2 *= "", x2 *= E.a, x2 *= {
 }, x2 *= null, x2 *= void 0, x3 *= a, x3 *= b, x3 *= !0, x3 *= 0, x3 *= "", x3 *= E.a, x3 *= {
 }, x3 *= null, x3 *= void 0, x4 *= a, x4 *= b, x4 *= !0, x4 *= 0, x4 *= "", x4 *= E.a, x4 *= {
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es5.1.normal/output.js
index 908ee58a3ca..58f91e84c0b 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es5.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es5.2.minified/output.js
index 2366c2a95b0..556c415d8e7 100644
--- a/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/assignmentOperator/compoundArithmeticAssignmentWithInvalidOperands/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-var E, a, b, x1, x2, x3, x4, x5, x6, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", x1 *= a, x1 *= b, x1 *= !0, x1 *= 0, x1 *= "", x1 *= E.a, x1 *= {
+var E, a, b, x1, x2, x3, x4, x5, x6, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", x1 *= a, x1 *= b, x1 *= !0, x1 *= 0, x1 *= "", x1 *= E.a, x1 *= {
 }, x1 *= null, x1 *= void 0, x2 *= a, x2 *= b, x2 *= !0, x2 *= 0, x2 *= "", x2 *= E.a, x2 *= {
 }, x2 *= null, x2 *= void 0, x3 *= a, x3 *= b, x3 *= !0, x3 *= 0, x3 *= "", x3 *= E.a, x3 *= {
 }, x3 *= null, x3 *= void 0, x4 *= a, x4 *= b, x4 *= !0, x4 *= 0, x4 *= "", x4 *= E.a, x4 *= {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es2015.1.normal/output.js
index ca2fd3c2148..2679b229b6d 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es2015.1.normal/output.js
@@ -5,10 +5,10 @@ class C {
     }
 }
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var M;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es2015.2.minified/output.js
index da37b119ae8..b31e88871f7 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-var E, E1, M, a, b;
-(E = E1 || (E1 = {
+var E, E, M, a, b;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", (function(M1) {
     var a1;
     M1.a = a1;
@@ -7,4 +7,4 @@ var E, E1, M, a, b;
 })), a + a, a + b, a + new class {
     static foo() {
     }
-}(), a + E1.a;
+}(), a + E.a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es5.1.normal/output.js
index a5814e4f2ef..3d3ad960adf 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es5.1.normal/output.js
@@ -34,10 +34,10 @@ var C = /*#__PURE__*/ function() {
     return C;
 }();
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var M;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es5.2.minified/output.js
index c30bc9020a8..930b66c23c3 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithAnyAndEveryType/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, M, a, E1, C = function() {
+var E, M, a, E, C = function() {
     "use strict";
     var Constructor;
     function C() {
@@ -19,8 +19,8 @@ var E, M, a, E1, C = function() {
         }
     ]), C;
 }();
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", E1[E1.c = 2] = "c", (function(M1) {
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", (function(M1) {
     var a1;
     M1.a = a1;
 })(M || (M = {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
index 39f9329ec54..fe529a0c218 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
@@ -5,10 +5,10 @@ class C {
     }
 }
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var M;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
index 82c84cc7608..d1367ef2cdc 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
@@ -1,11 +1,11 @@
-var E, E1, M, a, b;
+var E, E, M, a, b;
 class C {
     static foo() {
     }
 }
-(E = E1 || (E1 = {
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", (function(M1) {
     var a1;
     M1.a = a1;
 })(M || (M = {
-})), a + a, a + b, E1.a + new C(), E1.a + C.foo(), E1.a + M;
+})), a + a, a + b, E.a + new C(), E.a + C.foo(), E.a + M;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
index 6d513ea8aa2..d0cbcdcffce 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
@@ -34,10 +34,10 @@ var C = /*#__PURE__*/ function() {
     return C;
 }();
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var M;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
index 72694ec82c1..16eec187c31 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, M, a, E1, C = function() {
+var E, M, a, E, C = function() {
     "use strict";
     var Constructor;
     function C() {
@@ -19,8 +19,8 @@ var E, M, a, E1, C = function() {
         }
     ]), C;
 }();
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", E1[E1.c = 2] = "c", (function(M1) {
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", (function(M1) {
     var a1;
     M1.a = a1;
 })(M || (M = {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es2015.1.normal/output.js
index a8b11e23df1..18b80f7bfa4 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the null or undefined value, it is treated as having the type of the other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es2015.2.minified/output.js
index 3ae89d4fc86..0ae5f977bf3 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", null + a, a + null, null + E1.a, null + E1.a, E1.a + null, E1.a + null;
+var E, E, a;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", null + a, a + null, null + E.a, null + E.a, E.a + null, E.a + null;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es5.1.normal/output.js
index a8b11e23df1..18b80f7bfa4 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the null or undefined value, it is treated as having the type of the other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es5.2.minified/output.js
index 3ae89d4fc86..0ae5f977bf3 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNullValueAndValidOperator/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", null + a, a + null, null + E1.a, null + E1.a, E1.a + null, E1.a + null;
+var E, E, a;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", null + a, a + null, null + E.a, null + E.a, E.a + null, E.a + null;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es2015.1.normal/output.js
index 13d196f55c6..b087335c53b 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es2015.1.normal/output.js
@@ -1,13 +1,13 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var F;
-(function(F1) {
-    F1[F1["c"] = 0] = "c";
-    F1[F1["d"] = 1] = "d";
+(function(F) {
+    F[F["c"] = 0] = "c";
+    F[F["d"] = 1] = "d";
 })(F || (F = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es2015.2.minified/output.js
index 9aa4b0c44e1..cbdc8eb8e44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, F, E1, F1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F1 || (F1 = {
-}))[F.c = 0] = "c", F[F.d = 1] = "d", a + a, a + b, E1.a + 0, E1.a + E1.b, E1.a + E1.b, E1.a + F1.c;
+var E, F, E, F, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F || (F = {
+}))[F.c = 0] = "c", F[F.d = 1] = "d", a + a, a + b, E.a + 0, E.a + E.b, E.a + E.b, E.a + F.c;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es5.1.normal/output.js
index 13d196f55c6..b087335c53b 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es5.1.normal/output.js
@@ -1,13 +1,13 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var F;
-(function(F1) {
-    F1[F1["c"] = 0] = "c";
-    F1[F1["d"] = 1] = "d";
+(function(F) {
+    F[F["c"] = 0] = "c";
+    F[F["d"] = 1] = "d";
 })(F || (F = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es5.2.minified/output.js
index 9aa4b0c44e1..cbdc8eb8e44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithNumberAndEnum/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, F, E1, F1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F1 || (F1 = {
-}))[F.c = 0] = "c", F[F.d = 1] = "d", a + a, a + b, E1.a + 0, E1.a + E1.b, E1.a + E1.b, E1.a + F1.c;
+var E, F, E, F, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F || (F = {
+}))[F.c = 0] = "c", F[F.d = 1] = "d", a + a, a + b, E.a + 0, E.a + E.b, E.a + E.b, E.a + F.c;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es2015.1.normal/output.js
index 816b7d6cedc..4af23efb6b2 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es2015.2.minified/output.js
index bb842d6e920..bd2a65826fa 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, x;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", x + a, x + b, x + E1.a;
+var E, E, a, b, x;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", x + a, x + b, x + E.a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es5.1.normal/output.js
index 816b7d6cedc..4af23efb6b2 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es5.2.minified/output.js
index bb842d6e920..bd2a65826fa 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithStringAndEveryType/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, x;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", x + a, x + b, x + E1.a;
+var E, E, a, b, x;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", x + a, x + b, x + E.a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es2015.1.normal/output.js
index 6d679ccf21a..0a6e2892814 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var // type parameter type is not a valid operand of addition operator
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 function foo(t, u) {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es2015.2.minified/output.js
index fcb70e7e46a..3a9ea1a3e4e 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b";
+var E, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es5.1.normal/output.js
index 93f64739023..84606822d4c 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var // type parameter type is not a valid operand of addition operator
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 function foo(t, u) {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es5.2.minified/output.js
index fcb70e7e46a..3a9ea1a3e4e 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithTypeParameter/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b";
+var E, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es2015.1.normal/output.js
index 5ce50c5e150..4ea1bf86bdf 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the null or undefined value, it is treated as having the type of the other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es2015.2.minified/output.js
index 3cd9d61122d..39113f88817 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", (void 0) + a, a + void 0, (void 0) + E1.a, (void 0) + E1.a, E1.a + void 0, E1.a + void 0;
+var E, E, a;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", (void 0) + a, a + void 0, (void 0) + E.a, (void 0) + E.a, E.a + void 0, E.a + void 0;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es5.1.normal/output.js
index 5ce50c5e150..4ea1bf86bdf 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the null or undefined value, it is treated as having the type of the other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es5.2.minified/output.js
index 3cd9d61122d..39113f88817 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndValidOperator/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", (void 0) + a, a + void 0, (void 0) + E1.a, (void 0) + E1.a, E1.a + void 0, E1.a + void 0;
+var E, E, a;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", (void 0) + a, a + void 0, (void 0) + E.a, (void 0) + E.a, E.a + void 0, E.a + void 0;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es2015.1.normal/output.js
index 5bbf7bdebe1..6e1ccf976be 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var // operands of an enum type are treated as having the primitive type Number.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es2015.2.minified/output.js
index f599c6968e0..7d724ecdd0f 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, c;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", c * a, c * b, E1.a * a, E1.a * b, E1.a * E1.b, 1 * E1.a, a * E1.b, b * E1.b, 1 * E1.b, E1.a / a, E1.a / b, E1.a / E1.b, E1.a / 1, a / E1.b, b / E1.b, 1 / E1.b, E1.a % a, E1.a % b, E1.a % E1.b, E1.a % 1, a % E1.b, b % E1.b, 1 % E1.b, E1.a - a, E1.a - b, E1.a - E1.b, E1.a - 1, a - E1.b, b - E1.b, 1 - E1.b, E1.a << a, E1.a << b, E1.a << E1.b, E1.a << 1, a << E1.b, b << E1.b, 1 << E1.b, E1.a >> a, E1.a >> b, E1.a >> E1.b, E1.a >> 1, a >> E1.b, b >> E1.b, 1 >> E1.b, E1.a >>> a, E1.a >>> b, E1.a >>> E1.b, E1.a >>> 1, a >>> E1.b, b >>> E1.b, 1 >>> E1.b, E1.a & a, E1.a & b, E1.a & E1.b, 1 & E1.a, a & E1.b, b & E1.b, 1 & E1.b, E1.a ^ a, E1.a ^ b, E1.a ^ E1.b, 1 ^ E1.a, a ^ E1.b, b ^ E1.b, 1 ^ E1.b, E1.a | a, E1.a | b, E1.a | E1.b, 1 | E1.a, a | E1.b, b | E1.b, 1 | E1.b;
+var E, E, a, b, c;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", c * a, c * b, E.a * a, E.a * b, E.a * E.b, 1 * E.a, a * E.b, b * E.b, 1 * E.b, E.a / a, E.a / b, E.a / E.b, E.a / 1, a / E.b, b / E.b, 1 / E.b, E.a % a, E.a % b, E.a % E.b, E.a % 1, a % E.b, b % E.b, 1 % E.b, E.a - a, E.a - b, E.a - E.b, E.a - 1, a - E.b, b - E.b, 1 - E.b, E.a << a, E.a << b, E.a << E.b, E.a << 1, a << E.b, b << E.b, 1 << E.b, E.a >> a, E.a >> b, E.a >> E.b, E.a >> 1, a >> E.b, b >> E.b, 1 >> E.b, E.a >>> a, E.a >>> b, E.a >>> E.b, E.a >>> 1, a >>> E.b, b >>> E.b, 1 >>> E.b, E.a & a, E.a & b, E.a & E.b, 1 & E.a, a & E.b, b & E.b, 1 & E.b, E.a ^ a, E.a ^ b, E.a ^ E.b, 1 ^ E.a, a ^ E.b, b ^ E.b, 1 ^ E.b, E.a | a, E.a | b, E.a | E.b, 1 | E.a, a | E.b, b | E.b, 1 | E.b;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es5.1.normal/output.js
index 5bbf7bdebe1..6e1ccf976be 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var // operands of an enum type are treated as having the primitive type Number.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es5.2.minified/output.js
index f599c6968e0..7d724ecdd0f 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnum/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, c;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", c * a, c * b, E1.a * a, E1.a * b, E1.a * E1.b, 1 * E1.a, a * E1.b, b * E1.b, 1 * E1.b, E1.a / a, E1.a / b, E1.a / E1.b, E1.a / 1, a / E1.b, b / E1.b, 1 / E1.b, E1.a % a, E1.a % b, E1.a % E1.b, E1.a % 1, a % E1.b, b % E1.b, 1 % E1.b, E1.a - a, E1.a - b, E1.a - E1.b, E1.a - 1, a - E1.b, b - E1.b, 1 - E1.b, E1.a << a, E1.a << b, E1.a << E1.b, E1.a << 1, a << E1.b, b << E1.b, 1 << E1.b, E1.a >> a, E1.a >> b, E1.a >> E1.b, E1.a >> 1, a >> E1.b, b >> E1.b, 1 >> E1.b, E1.a >>> a, E1.a >>> b, E1.a >>> E1.b, E1.a >>> 1, a >>> E1.b, b >>> E1.b, 1 >>> E1.b, E1.a & a, E1.a & b, E1.a & E1.b, 1 & E1.a, a & E1.b, b & E1.b, 1 & E1.b, E1.a ^ a, E1.a ^ b, E1.a ^ E1.b, 1 ^ E1.a, a ^ E1.b, b ^ E1.b, 1 ^ E1.b, E1.a | a, E1.a | b, E1.a | E1.b, 1 | E1.a, a | E1.b, b | E1.b, 1 | E1.b;
+var E, E, a, b, c;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", c * a, c * b, E.a * a, E.a * b, E.a * E.b, 1 * E.a, a * E.b, b * E.b, 1 * E.b, E.a / a, E.a / b, E.a / E.b, E.a / 1, a / E.b, b / E.b, 1 / E.b, E.a % a, E.a % b, E.a % E.b, E.a % 1, a % E.b, b % E.b, 1 % E.b, E.a - a, E.a - b, E.a - E.b, E.a - 1, a - E.b, b - E.b, 1 - E.b, E.a << a, E.a << b, E.a << E.b, E.a << 1, a << E.b, b << E.b, 1 << E.b, E.a >> a, E.a >> b, E.a >> E.b, E.a >> 1, a >> E.b, b >> E.b, 1 >> E.b, E.a >>> a, E.a >>> b, E.a >>> E.b, E.a >>> 1, a >>> E.b, b >>> E.b, 1 >>> E.b, E.a & a, E.a & b, E.a & E.b, 1 & E.a, a & E.b, b & E.b, 1 & E.b, E.a ^ a, E.a ^ b, E.a ^ E.b, 1 ^ E.a, a ^ E.b, b ^ E.b, 1 ^ E.b, E.a | a, E.a | b, E.a | E.b, 1 | E.a, a | E.b, b | E.b, 1 | E.b;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es2015.1.normal/output.js
index 04237a76076..346b3c8cc14 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es2015.1.normal/output.js
@@ -1,14 +1,14 @@
 var // operands of an enum type are treated as having the primitive type Number.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var F;
-(function(F1) {
-    F1[F1["c"] = 0] = "c";
-    F1[F1["d"] = 1] = "d";
+(function(F) {
+    F[F["c"] = 0] = "c";
+    F[F["d"] = 1] = "d";
 })(F || (F = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es2015.2.minified/output.js
index 1c94607d912..0ae17bc1a9a 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, F, E1, F1, a, b, c;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F1 || (F1 = {
-}))[F.c = 0] = "c", F[F.d = 1] = "d", c * a, c * b, E1.a * a, E1.a * b, E1.a * E1.b, 1 * E1.a, a * E1.b, b * E1.b, 1 * E1.b, E1.a / a, E1.a / b, E1.a / E1.b, E1.a / 1, a / E1.b, b / E1.b, 1 / E1.b, E1.a % a, E1.a % b, E1.a % E1.b, E1.a % 1, a % E1.b, b % E1.b, 1 % E1.b, E1.a - a, E1.a - b, E1.a - E1.b, E1.a - 1, a - E1.b, b - E1.b, 1 - E1.b, E1.a << a, E1.a << b, E1.a << E1.b, E1.a << 1, a << E1.b, b << E1.b, 1 << E1.b, E1.a >> a, E1.a >> b, E1.a >> E1.b, E1.a >> 1, a >> E1.b, b >> E1.b, 1 >> E1.b, E1.a >>> a, E1.a >>> b, E1.a >>> E1.b, E1.a >>> 1, a >>> E1.b, b >>> E1.b, 1 >>> E1.b, E1.a & a, E1.a & b, E1.a & E1.b, 1 & E1.a, a & E1.b, b & E1.b, 1 & E1.b, E1.a ^ a, E1.a ^ b, E1.a ^ E1.b, 1 ^ E1.a, a ^ E1.b, b ^ E1.b, 1 ^ E1.b, E1.a | a, E1.a | b, E1.a | E1.b, 1 | E1.a, a | E1.b, b | E1.b, 1 | E1.b;
+var E, F, E, F, a, b, c;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F || (F = {
+}))[F.c = 0] = "c", F[F.d = 1] = "d", c * a, c * b, E.a * a, E.a * b, E.a * E.b, 1 * E.a, a * E.b, b * E.b, 1 * E.b, E.a / a, E.a / b, E.a / E.b, E.a / 1, a / E.b, b / E.b, 1 / E.b, E.a % a, E.a % b, E.a % E.b, E.a % 1, a % E.b, b % E.b, 1 % E.b, E.a - a, E.a - b, E.a - E.b, E.a - 1, a - E.b, b - E.b, 1 - E.b, E.a << a, E.a << b, E.a << E.b, E.a << 1, a << E.b, b << E.b, 1 << E.b, E.a >> a, E.a >> b, E.a >> E.b, E.a >> 1, a >> E.b, b >> E.b, 1 >> E.b, E.a >>> a, E.a >>> b, E.a >>> E.b, E.a >>> 1, a >>> E.b, b >>> E.b, 1 >>> E.b, E.a & a, E.a & b, E.a & E.b, 1 & E.a, a & E.b, b & E.b, 1 & E.b, E.a ^ a, E.a ^ b, E.a ^ E.b, 1 ^ E.a, a ^ E.b, b ^ E.b, 1 ^ E.b, E.a | a, E.a | b, E.a | E.b, 1 | E.a, a | E.b, b | E.b, 1 | E.b;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es5.1.normal/output.js
index 04237a76076..346b3c8cc14 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es5.1.normal/output.js
@@ -1,14 +1,14 @@
 var // operands of an enum type are treated as having the primitive type Number.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var F;
-(function(F1) {
-    F1[F1["c"] = 0] = "c";
-    F1[F1["d"] = 1] = "d";
+(function(F) {
+    F[F["c"] = 0] = "c";
+    F[F["d"] = 1] = "d";
 })(F || (F = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es5.2.minified/output.js
index 1c94607d912..0ae17bc1a9a 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithEnumUnion/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, F, E1, F1, a, b, c;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F1 || (F1 = {
-}))[F.c = 0] = "c", F[F.d = 1] = "d", c * a, c * b, E1.a * a, E1.a * b, E1.a * E1.b, 1 * E1.a, a * E1.b, b * E1.b, 1 * E1.b, E1.a / a, E1.a / b, E1.a / E1.b, E1.a / 1, a / E1.b, b / E1.b, 1 / E1.b, E1.a % a, E1.a % b, E1.a % E1.b, E1.a % 1, a % E1.b, b % E1.b, 1 % E1.b, E1.a - a, E1.a - b, E1.a - E1.b, E1.a - 1, a - E1.b, b - E1.b, 1 - E1.b, E1.a << a, E1.a << b, E1.a << E1.b, E1.a << 1, a << E1.b, b << E1.b, 1 << E1.b, E1.a >> a, E1.a >> b, E1.a >> E1.b, E1.a >> 1, a >> E1.b, b >> E1.b, 1 >> E1.b, E1.a >>> a, E1.a >>> b, E1.a >>> E1.b, E1.a >>> 1, a >>> E1.b, b >>> E1.b, 1 >>> E1.b, E1.a & a, E1.a & b, E1.a & E1.b, 1 & E1.a, a & E1.b, b & E1.b, 1 & E1.b, E1.a ^ a, E1.a ^ b, E1.a ^ E1.b, 1 ^ E1.a, a ^ E1.b, b ^ E1.b, 1 ^ E1.b, E1.a | a, E1.a | b, E1.a | E1.b, 1 | E1.a, a | E1.b, b | E1.b, 1 | E1.b;
+var E, F, E, F, a, b, c;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (F = F || (F = {
+}))[F.c = 0] = "c", F[F.d = 1] = "d", c * a, c * b, E.a * a, E.a * b, E.a * E.b, 1 * E.a, a * E.b, b * E.b, 1 * E.b, E.a / a, E.a / b, E.a / E.b, E.a / 1, a / E.b, b / E.b, 1 / E.b, E.a % a, E.a % b, E.a % E.b, E.a % 1, a % E.b, b % E.b, 1 % E.b, E.a - a, E.a - b, E.a - E.b, E.a - 1, a - E.b, b - E.b, 1 - E.b, E.a << a, E.a << b, E.a << E.b, E.a << 1, a << E.b, b << E.b, 1 << E.b, E.a >> a, E.a >> b, E.a >> E.b, E.a >> 1, a >> E.b, b >> E.b, 1 >> E.b, E.a >>> a, E.a >>> b, E.a >>> E.b, E.a >>> 1, a >>> E.b, b >>> E.b, 1 >>> E.b, E.a & a, E.a & b, E.a & E.b, 1 & E.a, a & E.b, b & E.b, 1 & E.b, E.a ^ a, E.a ^ b, E.a ^ E.b, 1 ^ E.a, a ^ E.b, b ^ E.b, 1 ^ E.b, E.a | a, E.a | b, E.a | E.b, 1 | E.a, a | E.b, b | E.b, 1 | E.b;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
index 73c676f8d0c..64455a26f66 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
@@ -1,10 +1,10 @@
 var // these operators require their operands to be of type Any, the Number primitive type, or
 // an enum type
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
index d0a9c9548c0..ca43cf366cf 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, c, d, e, f;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", a * a, a * b, E1.a * a, E1.a * b, E1.a * c, E1.a * d, E1.a * e, E1.a * f, a * E1.b, b * E1.b, c * E1.b, d * E1.b, e * E1.b, f * E1.b, E1.a / a, E1.a / b, E1.a / c, E1.a / d, E1.a / e, E1.a / f, a / E1.b, b / E1.b, c / E1.b, d / E1.b, e / E1.b, f / E1.b, E1.a % a, E1.a % b, E1.a % c, E1.a % d, E1.a % e, E1.a % f, a % E1.b, b % E1.b, c % E1.b, d % E1.b, e % E1.b, f % E1.b, E1.a - a, E1.a - b, E1.a - c, E1.a - d, E1.a - e, E1.a - f, a - E1.b, b - E1.b, c - E1.b, d - E1.b, e - E1.b, f - E1.b, E1.a << a, E1.a << b, E1.a << c, E1.a << d, E1.a << e, E1.a << f, a << E1.b, b << E1.b, c << E1.b, d << E1.b, e << E1.b, f << E1.b, E1.a >> a, E1.a >> b, E1.a >> c, E1.a >> d, E1.a >> e, E1.a >> f, a >> E1.b, b >> E1.b, c >> E1.b, d >> E1.b, e >> E1.b, f >> E1.b, E1.a >>> a, E1.a >>> b, E1.a >>> c, E1.a >>> d, E1.a >>> e, E1.a >>> f, a >>> E1.b, b >>> E1.b, c >>> E1.b, d >>> E1.b, e >>> E1.b, f >>> E1.b, E1.a & a, E1.a & b, E1.a & c, E1.a & d, E1.a & e, E1.a & f, a & E1.b, b & E1.b, c & E1.b, d & E1.b, e & E1.b, f & E1.b, E1.a ^ a, E1.a ^ b, E1.a ^ c, E1.a ^ d, E1.a ^ e, E1.a ^ f, a ^ E1.b, b ^ E1.b, c ^ E1.b, d ^ E1.b, e ^ E1.b, f ^ E1.b, E1.a | a, E1.a | b, E1.a | c, E1.a | d, E1.a | e, E1.a | f, a | E1.b, b | E1.b, c | E1.b, d | E1.b, e | E1.b, f | E1.b;
+var E, E, a, b, c, d, e, f;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", a * a, a * b, E.a * a, E.a * b, E.a * c, E.a * d, E.a * e, E.a * f, a * E.b, b * E.b, c * E.b, d * E.b, e * E.b, f * E.b, E.a / a, E.a / b, E.a / c, E.a / d, E.a / e, E.a / f, a / E.b, b / E.b, c / E.b, d / E.b, e / E.b, f / E.b, E.a % a, E.a % b, E.a % c, E.a % d, E.a % e, E.a % f, a % E.b, b % E.b, c % E.b, d % E.b, e % E.b, f % E.b, E.a - a, E.a - b, E.a - c, E.a - d, E.a - e, E.a - f, a - E.b, b - E.b, c - E.b, d - E.b, e - E.b, f - E.b, E.a << a, E.a << b, E.a << c, E.a << d, E.a << e, E.a << f, a << E.b, b << E.b, c << E.b, d << E.b, e << E.b, f << E.b, E.a >> a, E.a >> b, E.a >> c, E.a >> d, E.a >> e, E.a >> f, a >> E.b, b >> E.b, c >> E.b, d >> E.b, e >> E.b, f >> E.b, E.a >>> a, E.a >>> b, E.a >>> c, E.a >>> d, E.a >>> e, E.a >>> f, a >>> E.b, b >>> E.b, c >>> E.b, d >>> E.b, e >>> E.b, f >>> E.b, E.a & a, E.a & b, E.a & c, E.a & d, E.a & e, E.a & f, a & E.b, b & E.b, c & E.b, d & E.b, e & E.b, f & E.b, E.a ^ a, E.a ^ b, E.a ^ c, E.a ^ d, E.a ^ e, E.a ^ f, a ^ E.b, b ^ E.b, c ^ E.b, d ^ E.b, e ^ E.b, f ^ E.b, E.a | a, E.a | b, E.a | c, E.a | d, E.a | e, E.a | f, a | E.b, b | E.b, c | E.b, d | E.b, e | E.b, f | E.b;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
index 73c676f8d0c..64455a26f66 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
@@ -1,10 +1,10 @@
 var // these operators require their operands to be of type Any, the Number primitive type, or
 // an enum type
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
index d0a9c9548c0..ca43cf366cf 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, c, d, e, f;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", a * a, a * b, E1.a * a, E1.a * b, E1.a * c, E1.a * d, E1.a * e, E1.a * f, a * E1.b, b * E1.b, c * E1.b, d * E1.b, e * E1.b, f * E1.b, E1.a / a, E1.a / b, E1.a / c, E1.a / d, E1.a / e, E1.a / f, a / E1.b, b / E1.b, c / E1.b, d / E1.b, e / E1.b, f / E1.b, E1.a % a, E1.a % b, E1.a % c, E1.a % d, E1.a % e, E1.a % f, a % E1.b, b % E1.b, c % E1.b, d % E1.b, e % E1.b, f % E1.b, E1.a - a, E1.a - b, E1.a - c, E1.a - d, E1.a - e, E1.a - f, a - E1.b, b - E1.b, c - E1.b, d - E1.b, e - E1.b, f - E1.b, E1.a << a, E1.a << b, E1.a << c, E1.a << d, E1.a << e, E1.a << f, a << E1.b, b << E1.b, c << E1.b, d << E1.b, e << E1.b, f << E1.b, E1.a >> a, E1.a >> b, E1.a >> c, E1.a >> d, E1.a >> e, E1.a >> f, a >> E1.b, b >> E1.b, c >> E1.b, d >> E1.b, e >> E1.b, f >> E1.b, E1.a >>> a, E1.a >>> b, E1.a >>> c, E1.a >>> d, E1.a >>> e, E1.a >>> f, a >>> E1.b, b >>> E1.b, c >>> E1.b, d >>> E1.b, e >>> E1.b, f >>> E1.b, E1.a & a, E1.a & b, E1.a & c, E1.a & d, E1.a & e, E1.a & f, a & E1.b, b & E1.b, c & E1.b, d & E1.b, e & E1.b, f & E1.b, E1.a ^ a, E1.a ^ b, E1.a ^ c, E1.a ^ d, E1.a ^ e, E1.a ^ f, a ^ E1.b, b ^ E1.b, c ^ E1.b, d ^ E1.b, e ^ E1.b, f ^ E1.b, E1.a | a, E1.a | b, E1.a | c, E1.a | d, E1.a | e, E1.a | f, a | E1.b, b | E1.b, c | E1.b, d | E1.b, e | E1.b, f | E1.b;
+var E, E, a, b, c, d, e, f;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", a * a, a * b, E.a * a, E.a * b, E.a * c, E.a * d, E.a * e, E.a * f, a * E.b, b * E.b, c * E.b, d * E.b, e * E.b, f * E.b, E.a / a, E.a / b, E.a / c, E.a / d, E.a / e, E.a / f, a / E.b, b / E.b, c / E.b, d / E.b, e / E.b, f / E.b, E.a % a, E.a % b, E.a % c, E.a % d, E.a % e, E.a % f, a % E.b, b % E.b, c % E.b, d % E.b, e % E.b, f % E.b, E.a - a, E.a - b, E.a - c, E.a - d, E.a - e, E.a - f, a - E.b, b - E.b, c - E.b, d - E.b, e - E.b, f - E.b, E.a << a, E.a << b, E.a << c, E.a << d, E.a << e, E.a << f, a << E.b, b << E.b, c << E.b, d << E.b, e << E.b, f << E.b, E.a >> a, E.a >> b, E.a >> c, E.a >> d, E.a >> e, E.a >> f, a >> E.b, b >> E.b, c >> E.b, d >> E.b, e >> E.b, f >> E.b, E.a >>> a, E.a >>> b, E.a >>> c, E.a >>> d, E.a >>> e, E.a >>> f, a >>> E.b, b >>> E.b, c >>> E.b, d >>> E.b, e >>> E.b, f >>> E.b, E.a & a, E.a & b, E.a & c, E.a & d, E.a & e, E.a & f, a & E.b, b & E.b, c & E.b, d & E.b, e & E.b, f & E.b, E.a ^ a, E.a ^ b, E.a ^ c, E.a ^ d, E.a ^ e, E.a ^ f, a ^ E.b, b ^ E.b, c ^ E.b, d ^ E.b, e ^ E.b, f ^ E.b, E.a | a, E.a | b, E.a | c, E.a | d, E.a | e, E.a | f, a | E.b, b | E.b, c | E.b, d | E.b, e | E.b, f | E.b;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es2015.1.normal/output.js
index b6d28e9c687..eb0f4b184f7 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the null or undefined value, it is treated as having the type of the
 // other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es2015.2.minified/output.js
index 94a5a7ad004..f5b9313f3eb 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", null * a, null * b, null * E1.a, null * E1.b, null / E1.a, E1.b / null, null % E1.a, E1.b % null, null - E1.a, E1.b - null, null << E1.a, E1.b << null, null >> E1.a, E1.b >> null, null >>> E1.a, E1.b >>> null, null & E1.a, null & E1.b, null ^ E1.a, null ^ E1.b, null | E1.a, null | E1.b;
+var E, E, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", null * a, null * b, null * E.a, null * E.b, null / E.a, E.b / null, null % E.a, E.b % null, null - E.a, E.b - null, null << E.a, E.b << null, null >> E.a, E.b >> null, null >>> E.a, E.b >>> null, null & E.a, null & E.b, null ^ E.a, null ^ E.b, null | E.a, null | E.b;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es5.1.normal/output.js
index b6d28e9c687..eb0f4b184f7 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the null or undefined value, it is treated as having the type of the
 // other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es5.2.minified/output.js
index 94a5a7ad004..f5b9313f3eb 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithNullValueAndValidOperands/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", null * a, null * b, null * E1.a, null * E1.b, null / E1.a, E1.b / null, null % E1.a, E1.b % null, null - E1.a, E1.b - null, null << E1.a, E1.b << null, null >> E1.a, E1.b >> null, null >>> E1.a, E1.b >>> null, null & E1.a, null & E1.b, null ^ E1.a, null ^ E1.b, null | E1.a, null | E1.b;
+var E, E, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", null * a, null * b, null * E.a, null * E.b, null / E.a, E.b / null, null % E.a, E.b % null, null - E.a, E.b - null, null << E.a, E.b << null, null >> E.a, E.b >> null, null >>> E.a, E.b >>> null, null & E.a, null & E.b, null ^ E.a, null ^ E.b, null | E.a, null | E.b;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.1.normal/output.js
index db352b74bb9..b5f3ff14ba2 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the undefined or undefined value, it is treated as having the type of the
 // other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.2.minified/output.js
index 296e858334f..2c00d6e1177 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (void 0) * a, (void 0) * b, (void 0) * E1.a, (void 0) * E1.b, (void 0) / E1.a, E1.b / void 0, (void 0) % E1.a, E1.b % void 0, (void 0) - E1.a, E1.b - void 0, (void 0) << E1.a, E1.b << void 0, (void 0) >> E1.a, E1.b >> void 0, (void 0) >>> E1.a, E1.b >>> void 0, (void 0) & E1.a, (void 0) & E1.b, (void 0) ^ E1.a, (void 0) ^ E1.b, (void 0) | E1.a, (void 0) | E1.b;
+var E, E, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (void 0) * a, (void 0) * b, (void 0) * E.a, (void 0) * E.b, (void 0) / E.a, E.b / void 0, (void 0) % E.a, E.b % void 0, (void 0) - E.a, E.b - void 0, (void 0) << E.a, E.b << void 0, (void 0) >> E.a, E.b >> void 0, (void 0) >>> E.a, E.b >>> void 0, (void 0) & E.a, (void 0) & E.b, (void 0) ^ E.a, (void 0) ^ E.b, (void 0) | E.a, (void 0) | E.b;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es5.1.normal/output.js
index db352b74bb9..b5f3ff14ba2 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // If one operand is the undefined or undefined value, it is treated as having the type of the
 // other operand.
 E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es5.2.minified/output.js
index 296e858334f..2c00d6e1177 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/arithmeticOperator/arithmeticOperatorWithUndefinedValueAndValidOperands/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", (void 0) * a, (void 0) * b, (void 0) * E1.a, (void 0) * E1.b, (void 0) / E1.a, E1.b / void 0, (void 0) % E1.a, E1.b % void 0, (void 0) - E1.a, E1.b - void 0, (void 0) << E1.a, E1.b << void 0, (void 0) >> E1.a, E1.b >> void 0, (void 0) >>> E1.a, E1.b >>> void 0, (void 0) & E1.a, (void 0) & E1.b, (void 0) ^ E1.a, (void 0) ^ E1.b, (void 0) | E1.a, (void 0) | E1.b;
+var E, E, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", (void 0) * a, (void 0) * b, (void 0) * E.a, (void 0) * E.b, (void 0) / E.a, E.b / void 0, (void 0) % E.a, E.b % void 0, (void 0) - E.a, E.b - void 0, (void 0) << E.a, E.b << void 0, (void 0) >> E.a, E.b >> void 0, (void 0) >>> E.a, E.b >>> void 0, (void 0) & E.a, (void 0) & E.b, (void 0) ^ E.a, (void 0) ^ E.b, (void 0) | E.a, (void 0) | E.b;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es2015.1.normal/output.js
index 46bea3d066b..86c90c4ecc2 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es2015.2.minified/output.js
index 70238e87f03..97698574f44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es5.1.normal/output.js
index 46bea3d066b..86c90c4ecc2 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es5.2.minified/output.js
index 70238e87f03..97698574f44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithIdenticalPrimitiveType/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es2015.1.normal/output.js
index 88d0c26d64a..8de1703d3c8 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es2015.2.minified/output.js
index ed823855823..18bda281033 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, c;
-(E = E1 || (E1 = {
+var E, E, a, b, c;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", a < b, a < c;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es5.1.normal/output.js
index 88d0c26d64a..8de1703d3c8 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es5.2.minified/output.js
index ed823855823..18bda281033 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipPrimitiveType/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b, c;
-(E = E1 || (E1 = {
+var E, E, a, b, c;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", a < b, a < c;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es2015.1.normal/output.js
index ad494e3d16f..3ad0703830e 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es2015.2.minified/output.js
index e9b35917858..97698574f44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", E1[E1.c = 2] = "c";
+var E, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es5.1.normal/output.js
index ad494e3d16f..3ad0703830e 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es5.2.minified/output.js
index e9b35917858..97698574f44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithNoRelationshipTypeParameter/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", E1[E1.b = 1] = "b", E1[E1.c = 2] = "c";
+var E, E;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es2015.1.normal/output.js
index 4afd7694bee..5807403f8ac 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var x;
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 function foo(t) {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es2015.2.minified/output.js
index 70238e87f03..97698574f44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es5.1.normal/output.js
index 4afd7694bee..5807403f8ac 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var x;
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 function foo(t) {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es5.2.minified/output.js
index 70238e87f03..97698574f44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsAny/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es2015.1.normal/output.js
index 71bf7c744d8..12b84492e46 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 function foo(t) {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es2015.2.minified/output.js
index 70238e87f03..97698574f44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es5.1.normal/output.js
index 71bf7c744d8..12b84492e46 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 function foo(t) {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es5.2.minified/output.js
index 70238e87f03..97698574f44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsNull/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es2015.1.normal/output.js
index 4afd7694bee..5807403f8ac 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var x;
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 function foo(t) {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es2015.2.minified/output.js
index 70238e87f03..97698574f44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es5.1.normal/output.js
index 4afd7694bee..5807403f8ac 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var x;
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 function foo(t) {
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es5.2.minified/output.js
index 70238e87f03..97698574f44 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithOneOperandIsUndefined/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c";
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es2015.1.normal/output.js
index 9d42bd3fb76..01b110228f9 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es2015.2.minified/output.js
index b6fa50bc92a..506115d6441 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", a < b, b < a, E1.a < b, b < E1.a, E1.a < 0, 0 < E1.a, E1.a > b, b > E1.a, E1.a > 0, 0 > E1.a, E1.a <= b, b <= E1.a, E1.a <= 0, 0 <= E1.a, E1.a >= b, b >= E1.a, E1.a >= 0, 0 >= E1.a, E1.a == b, b == E1.a, 0 == E1.a, 0 == E1.a, E1.a != b, b != E1.a, 0 != E1.a, 0 != E1.a, E1.a === b, b === E1.a, 0 === E1.a, 0 === E1.a, E1.a !== b, b !== E1.a, 0 !== E1.a, 0 !== E1.a;
+var E, E, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", a < b, b < a, E.a < b, b < E.a, E.a < 0, 0 < E.a, E.a > b, b > E.a, E.a > 0, 0 > E.a, E.a <= b, b <= E.a, E.a <= 0, 0 <= E.a, E.a >= b, b >= E.a, E.a >= 0, 0 >= E.a, E.a == b, b == E.a, 0 == E.a, 0 == E.a, E.a != b, b != E.a, 0 != E.a, 0 != E.a, E.a === b, b === E.a, 0 === E.a, 0 === E.a, E.a !== b, b !== E.a, 0 !== E.a, 0 !== E.a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es5.1.normal/output.js
index 9d42bd3fb76..01b110228f9 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
-    E1[E1["b"] = 1] = "b";
-    E1[E1["c"] = 2] = "c";
+(function(E) {
+    E[E["a"] = 0] = "a";
+    E[E["b"] = 1] = "b";
+    E[E["c"] = 2] = "c";
 })(E || (E = {
 }));
 var a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es5.2.minified/output.js
index b6fa50bc92a..506115d6441 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/comparisonOperator/comparisonOperatorWithSubtypeEnumAndNumber/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, a, b;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", a < b, b < a, E1.a < b, b < E1.a, E1.a < 0, 0 < E1.a, E1.a > b, b > E1.a, E1.a > 0, 0 > E1.a, E1.a <= b, b <= E1.a, E1.a <= 0, 0 <= E1.a, E1.a >= b, b >= E1.a, E1.a >= 0, 0 >= E1.a, E1.a == b, b == E1.a, 0 == E1.a, 0 == E1.a, E1.a != b, b != E1.a, 0 != E1.a, 0 != E1.a, E1.a === b, b === E1.a, 0 === E1.a, 0 === E1.a, E1.a !== b, b !== E1.a, 0 !== E1.a, 0 !== E1.a;
+var E, E, a, b;
+(E = E || (E = {
+}))[E.a = 0] = "a", E[E.b = 1] = "b", E[E.c = 2] = "c", a < b, b < a, E.a < b, b < E.a, E.a < 0, 0 < E.a, E.a > b, b > E.a, E.a > 0, 0 > E.a, E.a <= b, b <= E.a, E.a <= 0, 0 <= E.a, E.a >= b, b >= E.a, E.a >= 0, 0 >= E.a, E.a == b, b == E.a, 0 == E.a, 0 == E.a, E.a != b, b != E.a, 0 != E.a, 0 != E.a, E.a === b, b === E.a, 0 === E.a, 0 === E.a, E.a !== b, b !== E.a, 0 !== E.a, 0 !== E.a;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
index d6413a5c03a..28cc602b24b 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 class Foo {
 }
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
+(function(E) {
+    E[E["a"] = 0] = "a";
 })(E || (E = {
 }));
 var x;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
index e5144b9bfd5..a4ac76a48ee 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1, x, a1;
-(E = E1 || (E1 = {
-}))[E.a = 0] = "a", a1 in x, (void 0) in x, E1.a in x;
+var E, E, x, a1;
+(E = E || (E = {
+}))[E.a = 0] = "a", a1 in x, (void 0) in x, E.a in x;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
index abbd9c6fdb1..3bea7d3764a 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es5.1.normal/output.js
@@ -8,8 +8,8 @@ var Foo = function Foo() {
     _classCallCheck(this, Foo);
 };
 var E;
-(function(E1) {
-    E1[E1["a"] = 0] = "a";
+(function(E) {
+    E[E["a"] = 0] = "a";
 })(E || (E = {
 }));
 var x;
diff --git a/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
index d76e251cea3..83c89c26886 100644
--- a/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/binaryOperators/inOperator/inOperatorWithInvalidOperands/input.ts/es5.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, x, a1, E1, Foo = function() {
+var E, x, a1, E, Foo = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, Foo);
 };
-(E1 = E || (E = {
-}))[E1.a = 0] = "a", a1 in x, E.a in x;
+(E = E || (E = {
+}))[E.a = 0] = "a", a1 in x, E.a in x;
diff --git a/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es2015.1.normal/output.js
index d5c685b5d5e..f601315db58 100644
--- a/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // When a function expression with no type parameters and no parameter type annotations 
 // is contextually typed (section 4.19) by a type T and a contextual signature S can be extracted from T
 E;
-(function(E1) {
-    E1[E1["red"] = 0] = "red";
-    E1[E1["blue"] = 1] = "blue";
+(function(E) {
+    E[E["red"] = 0] = "red";
+    E[E["blue"] = 1] = "blue";
 })(E || (E = {
 }));
 // A contextual signature S is extracted from a function type T as follows:
diff --git a/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es2015.2.minified/output.js
index aadc5b18e9f..3bc3c48ba9b 100644
--- a/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.red = 0] = "red", E[E.blue = 1] = "blue", (num, str)=>(num.toExponential(), 0)
 ;
diff --git a/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es5.1.normal/output.js
index f6f2768cf32..53a43d47a1d 100644
--- a/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es5.1.normal/output.js
@@ -20,9 +20,9 @@ function _createClass(Constructor, protoProps, staticProps) {
 var // When a function expression with no type parameters and no parameter type annotations 
 // is contextually typed (section 4.19) by a type T and a contextual signature S can be extracted from T
 E;
-(function(E1) {
-    E1[E1["red"] = 0] = "red";
-    E1[E1["blue"] = 1] = "blue";
+(function(E) {
+    E[E["red"] = 0] = "red";
+    E[E["blue"] = 1] = "blue";
 })(E || (E = {
 }));
 // A contextual signature S is extracted from a function type T as follows:
diff --git a/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es5.2.minified/output.js
index 761923985fc..842c8423151 100644
--- a/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/contextualTyping/functionExpressionContextualTyping1/input.ts/es5.2.minified/output.js
@@ -7,9 +7,9 @@ function _defineProperties(target, props) {
         descriptor.enumerable = descriptor.enumerable || !1, descriptor.configurable = !0, "value" in descriptor && (descriptor.writable = !0), Object.defineProperty(target, descriptor.key, descriptor);
     }
 }
-(E = E1 || (E1 = {
+(E = E || (E = {
 }))[E.red = 0] = "red", E[E.blue = 1] = "blue";
-var E, E1, Class = function() {
+var E, E, Class = function() {
     "use strict";
     var Constructor, protoProps, staticProps;
     function Class() {
diff --git a/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es2015.1.normal/output.js
index c41edaa3e75..d4d6327d9a0 100644
--- a/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // @noImplicitAny: true
 E;
-(function(E1) {
-    E1["A"] = "a";
-    E1["B"] = "b";
-    E1["C"] = "c";
+(function(E) {
+    E["A"] = "a";
+    E["B"] = "b";
+    E["C"] = "c";
 })(E || (E = {
 }));
 const snb = item[e];
diff --git a/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es2015.2.minified/output.js
index 5b69988482a..d254d0d12ea 100644
--- a/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-})).A = "a", E1.B = "b", E1.C = "c", item[e];
+var E, E;
+(E = E || (E = {
+})).A = "a", E.B = "b", E.C = "c", item[e];
diff --git a/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es5.1.normal/output.js
index ee760876514..84ace534122 100644
--- a/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // @noImplicitAny: true
 E;
-(function(E1) {
-    E1["A"] = "a";
-    E1["B"] = "b";
-    E1["C"] = "c";
+(function(E) {
+    E["A"] = "a";
+    E["B"] = "b";
+    E["C"] = "c";
 })(E || (E = {
 }));
 var snb = item[e];
diff --git a/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es5.2.minified/output.js
index 5b69988482a..d254d0d12ea 100644
--- a/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/elementAccess/stringEnumInElementAccess01/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-})).A = "a", E1.B = "b", E1.C = "c", item[e];
+var E, E;
+(E = E || (E = {
+})).A = "a", E.B = "b", E.C = "c", item[e];
diff --git a/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es2015.1.normal/output.js
index 498d13c8048..78dc7293b0c 100644
--- a/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es2015.1.normal/output.js
@@ -13,13 +13,13 @@ foo({
     read: ()=>s
 });
 var E1;
-(function(E11) {
-    E11[E11["X"] = 0] = "X";
+(function(E1) {
+    E1[E1["X"] = 0] = "X";
 })(E1 || (E1 = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["X"] = 0] = "X";
+(function(E2) {
+    E2[E2["X"] = 0] = "X";
 })(E2 || (E2 = {
 }));
 var v1;
diff --git a/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es2015.2.minified/output.js
index 36f6f3d14f4..caf962c788d 100644
--- a/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E1, E2, s, E11, E21;
+var E1, E2, s, E1, E2;
 function foo(x) {
 }
 foo({
@@ -9,8 +9,8 @@ foo({
     write: (value)=>s = value
     ,
     read: ()=>s
-}), (E1 = E11 || (E11 = {
-}))[E1.X = 0] = "X", (E2 = E21 || (E21 = {
+}), (E1 = E1 || (E1 = {
+}))[E1.X = 0] = "X", (E2 = E2 || (E2 = {
 }))[E2.X = 0] = "X", f1({
     w: (x)=>x
     ,
@@ -19,16 +19,16 @@ foo({
     w: (x)=>x
     ,
     r: ()=>0
-}, E11.X), f1({
+}, E1.X), f1({
     w: (x)=>x
     ,
-    r: ()=>E11.X
+    r: ()=>E1.X
 }, 0), f1({
     w: (x)=>x
     ,
-    r: ()=>E11.X
-}, E11.X), f1({
+    r: ()=>E1.X
+}, E1.X), f1({
     w: (x)=>x
     ,
-    r: ()=>E11.X
-}, E21.X);
+    r: ()=>E1.X
+}, E2.X);
diff --git a/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es5.1.normal/output.js
index fd03c3d6c84..e94430d6cf7 100644
--- a/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es5.1.normal/output.js
@@ -19,13 +19,13 @@ foo({
     }
 });
 var E1;
-(function(E11) {
-    E11[E11["X"] = 0] = "X";
+(function(E1) {
+    E1[E1["X"] = 0] = "X";
 })(E1 || (E1 = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["X"] = 0] = "X";
+(function(E2) {
+    E2[E2["X"] = 0] = "X";
 })(E2 || (E2 = {
 }));
 var v1;
diff --git a/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es5.2.minified/output.js
index 4106e742cbe..ab1a105f614 100644
--- a/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/functionCalls/typeArgumentInferenceWithObjectLiteral/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E1, E2, s, E11, E21;
+var E1, E2, s, E1, E2;
 function foo(x) {
 }
 foo({
@@ -15,8 +15,8 @@ foo({
     read: function() {
         return s;
     }
-}), (E1 = E11 || (E11 = {
-}))[E1.X = 0] = "X", (E2 = E21 || (E21 = {
+}), (E1 = E1 || (E1 = {
+}))[E1.X = 0] = "X", (E2 = E2 || (E2 = {
 }))[E2.X = 0] = "X", f1({
     w: function(x) {
         return x;
@@ -31,25 +31,25 @@ foo({
     r: function() {
         return 0;
     }
-}, E11.X), f1({
+}, E1.X), f1({
     w: function(x) {
         return x;
     },
     r: function() {
-        return E11.X;
+        return E1.X;
     }
 }, 0), f1({
     w: function(x) {
         return x;
     },
     r: function() {
-        return E11.X;
+        return E1.X;
     }
-}, E11.X), f1({
+}, E1.X), f1({
     w: function(x) {
         return x;
     },
     r: function() {
-        return E11.X;
+        return E1.X;
     }
-}, E21.X);
+}, E2.X);
diff --git a/crates/swc/tests/tsc-references/expressions/identifiers/scopeResolutionIdentifiers/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/identifiers/scopeResolutionIdentifiers/input.ts/es2015.1.normal/output.js
index 3b4d45ee8c2..6029cd0db9b 100644
--- a/crates/swc/tests/tsc-references/expressions/identifiers/scopeResolutionIdentifiers/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/identifiers/scopeResolutionIdentifiers/input.ts/es2015.1.normal/output.js
@@ -32,7 +32,7 @@ class C {
 var M3;
 (function(M3) {
     var s4;
-    var M4;
+    let M4;
     (function(M4) {
         var n = s4;
         var n;
diff --git a/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es2015.1.normal/output.js
index 91ce0a7d3d7..7176c09d2cc 100644
--- a/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es2015.1.normal/output.js
@@ -3,11 +3,11 @@ class A {
 class B extends A {
 }
 var Compass;
-(function(Compass1) {
-    Compass1[Compass1["North"] = 0] = "North";
-    Compass1[Compass1["South"] = 1] = "South";
-    Compass1[Compass1["East"] = 2] = "East";
-    Compass1[Compass1["West"] = 3] = "West";
+(function(Compass) {
+    Compass[Compass["North"] = 0] = "North";
+    Compass[Compass["South"] = 1] = "South";
+    Compass[Compass["East"] = 2] = "East";
+    Compass[Compass["West"] = 3] = "West";
 })(Compass || (Compass = {
 }));
 var numIndex = {
diff --git a/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es2015.2.minified/output.js
index 9f6ab7579f4..b171d0d4e79 100644
--- a/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es2015.2.minified/output.js
@@ -1,11 +1,11 @@
-(Compass = Compass1 || (Compass1 = {
+(Compass = Compass || (Compass = {
 }))[Compass.North = 0] = "North", Compass[Compass.South = 1] = "South", Compass[Compass.East = 2] = "East", Compass[Compass.West = 3] = "West";
-var Compass, Compass1, bothIndex, stringOrNumber, someObject, numIndex = {
+var Compass, Compass, bothIndex, stringOrNumber, someObject, numIndex = {
     3: "three",
     three: "three"
 }, strIndex = {
-    N: Compass1.North,
-    E: Compass1.East
+    N: Compass.North,
+    E: Compass.East
 };
 function noIndex() {
 }
@@ -21,4 +21,4 @@ var obj = {
     "literal property": 100
 }, anyVar = {
 };
-obj.y = 4, anyVar.x = anyVar.y = obj.x = anyVar.z, obj.x, obj.hasOwnProperty, obj.qqq, obj["literal property"], obj["wa wa wa wa wa"], obj["10"], obj["1"], numIndex[3], numIndex[Compass1.South], numIndex[anyVar], numIndex.what, numIndex[someObject], strIndex.N, strIndex.zzz, strIndex[10], strIndex[Compass1.East], strIndex[null], noIndex[123], noIndex[Compass1.South], noIndex[null], noIndex[someObject], noIndex[32], bothIndex[Compass1.East], bothIndex[null], bothIndex.foo, bothIndex["1.0"], bothIndex[someObject], numIndex[stringOrNumber], strIndex[stringOrNumber], bothIndex[stringOrNumber];
+obj.y = 4, anyVar.x = anyVar.y = obj.x = anyVar.z, obj.x, obj.hasOwnProperty, obj.qqq, obj["literal property"], obj["wa wa wa wa wa"], obj["10"], obj["1"], numIndex[3], numIndex[Compass.South], numIndex[anyVar], numIndex.what, numIndex[someObject], strIndex.N, strIndex.zzz, strIndex[10], strIndex[Compass.East], strIndex[null], noIndex[123], noIndex[Compass.South], noIndex[null], noIndex[someObject], noIndex[32], bothIndex[Compass.East], bothIndex[null], bothIndex.foo, bothIndex["1.0"], bothIndex[someObject], numIndex[stringOrNumber], strIndex[stringOrNumber], bothIndex[stringOrNumber];
diff --git a/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es5.1.normal/output.js
index 5e2d7badd5f..e10c2c8f14a 100644
--- a/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es5.1.normal/output.js
@@ -84,11 +84,11 @@ var B = /*#__PURE__*/ function(A) {
     return B;
 }(A);
 var Compass;
-(function(Compass1) {
-    Compass1[Compass1["North"] = 0] = "North";
-    Compass1[Compass1["South"] = 1] = "South";
-    Compass1[Compass1["East"] = 2] = "East";
-    Compass1[Compass1["West"] = 3] = "West";
+(function(Compass) {
+    Compass[Compass["North"] = 0] = "North";
+    Compass[Compass["South"] = 1] = "South";
+    Compass[Compass["East"] = 2] = "East";
+    Compass[Compass["West"] = 3] = "West";
 })(Compass || (Compass = {
 }));
 var numIndex = {
diff --git a/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es5.2.minified/output.js
index a745a301d14..2870bbb4eb6 100644
--- a/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/propertyAccess/propertyAccess/input.ts/es5.2.minified/output.js
@@ -11,7 +11,7 @@ function _setPrototypeOf(o, p) {
         return o.__proto__ = p, o;
     }, _setPrototypeOf(o, p);
 }
-var Compass, bothIndex, stringOrNumber, someObject, Compass1, A = function() {
+var Compass, bothIndex, stringOrNumber, someObject, Compass, A = function() {
     "use strict";
     _classCallCheck(this, A);
 }, B = function(A1) {
@@ -55,8 +55,8 @@ var Compass, bothIndex, stringOrNumber, someObject, Compass1, A = function() {
     }
     return B;
 }(A);
-(Compass1 = Compass || (Compass = {
-}))[Compass1.North = 0] = "North", Compass1[Compass1.South = 1] = "South", Compass1[Compass1.East = 2] = "East", Compass1[Compass1.West = 3] = "West";
+(Compass = Compass || (Compass = {
+}))[Compass.North = 0] = "North", Compass[Compass.South = 1] = "South", Compass[Compass.East = 2] = "East", Compass[Compass.West = 3] = "West";
 var numIndex = {
     3: "three",
     three: "three"
diff --git a/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es2015.1.normal/output.js
index e65863078c9..3f70f44d762 100644
--- a/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var Color;
-(function(Color1) {
-    Color1[Color1["R"] = 0] = "R";
-    Color1[Color1["G"] = 1] = "G";
-    Color1[Color1["B"] = 2] = "B";
+(function(Color) {
+    Color[Color["R"] = 0] = "R";
+    Color[Color["G"] = 1] = "G";
+    Color[Color["B"] = 2] = "B";
 })(Color || (Color = {
 }));
 function f1(x) {
diff --git a/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es2015.2.minified/output.js
index b656b416f0b..519733d4d5f 100644
--- a/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var Color, Color1;
-(Color1 = Color || (Color = {
-}))[Color1.R = 0] = "R", Color1[Color1.G = 1] = "G", Color1[Color1.B = 2] = "B";
+var Color, Color;
+(Color = Color || (Color = {
+}))[Color.R = 0] = "R", Color[Color.G = 1] = "G", Color[Color.B = 2] = "B";
diff --git a/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es5.1.normal/output.js
index e65863078c9..3f70f44d762 100644
--- a/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var Color;
-(function(Color1) {
-    Color1[Color1["R"] = 0] = "R";
-    Color1[Color1["G"] = 1] = "G";
-    Color1[Color1["B"] = 2] = "B";
+(function(Color) {
+    Color[Color["R"] = 0] = "R";
+    Color[Color["G"] = 1] = "G";
+    Color[Color["B"] = 2] = "B";
 })(Color || (Color = {
 }));
 function f1(x) {
diff --git a/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es5.2.minified/output.js
index b656b416f0b..519733d4d5f 100644
--- a/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/typeGuards/TypeGuardWithEnumUnion/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var Color, Color1;
-(Color1 = Color || (Color = {
-}))[Color1.R = 0] = "R", Color1[Color1.G = 1] = "G", Color1[Color1.B = 2] = "B";
+var Color, Color;
+(Color = Color || (Color = {
+}))[Color.R = 0] = "R", Color[Color.G = 1] = "G", Color[Color.B = 2] = "B";
diff --git a/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInFunctionAndModuleBlock/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInFunctionAndModuleBlock/input.ts/es2015.1.normal/output.js
index 71290e9fe08..8f6690feeda 100644
--- a/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInFunctionAndModuleBlock/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInFunctionAndModuleBlock/input.ts/es2015.1.normal/output.js
@@ -39,7 +39,7 @@ function foo5(x) {
 var m;
 (function(m) {
     var x;
-    var m2;
+    let m2;
     (function(m2) {
         var b = x; // new scope - number | boolean | string
         var y;
diff --git a/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInFunctionAndModuleBlock/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInFunctionAndModuleBlock/input.ts/es2015.2.minified/output.js
index 54d84e5003f..60254b7d517 100644
--- a/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInFunctionAndModuleBlock/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInFunctionAndModuleBlock/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,7 @@
 var m;
 !function(m) {
-    var x, m2;
+    var x;
+    let m2;
     m2 || (m2 = {
     }), "string" == typeof x || ("boolean" == typeof x, x.toString());
 }(m || (m = {
diff --git a/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInModule/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInModule/input.ts/es2015.1.normal/output.js
index 4aa429cd96d..ce9359e61c9 100644
--- a/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInModule/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInModule/input.ts/es2015.1.normal/output.js
@@ -30,7 +30,7 @@ var m2;
 (function(m21) {
     var var2;
     var var3;
-    var m31;
+    let m31;
     (function(m3) {
         // global vars in function declaration
         num = typeof var1 === "string" && var1.length; // string
diff --git a/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInModule/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInModule/input.ts/es2015.2.minified/output.js
index e9ff21dd9c3..377de6a2350 100644
--- a/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInModule/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/typeGuards/typeGuardsInModule/input.ts/es2015.2.minified/output.js
@@ -4,8 +4,9 @@ var num, strOrNum, var1, m1, m2;
     num = "string" == typeof var1 && var1.length, num = "string" == typeof var2 ? var2.length : var2, "string" == typeof var3, strOrNum = var3, m11.var3 = var3;
 }(m1 || (m1 = {
 })), (function(m21) {
-    var var2, var3, m3, m31, var4, var5;
-    m31 = m3 || (m3 = {
-    }), num = "string" == typeof var1 && var1.length, num = "string" == typeof var2 && var2.length, strOrNum = "string" == typeof var3 && var3, num = "string" == typeof var4 ? var4.length : var4, "string" == typeof var5, strOrNum = var5, m31.var5 = var5, m21.var3 = var3;
+    var var2, var3, m3, var4, var5;
+    let m31;
+    m3 = m31 || (m31 = {
+    }), num = "string" == typeof var1 && var1.length, num = "string" == typeof var2 && var2.length, strOrNum = "string" == typeof var3 && var3, num = "string" == typeof var4 ? var4.length : var4, "string" == typeof var5, strOrNum = var5, m3.var5 = var5, m21.var3 = var3;
 })(m2 || (m2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es2015.1.normal/output.js
index 29ca96c9727..ad5e6d95bb0 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es2015.1.normal/output.js
@@ -1,10 +1,10 @@
 var // @allowUnreachableCode: true
 // ~ operator on enum type
 ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es2015.2.minified/output.js
index d9d1855db2f..ac940c04281 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM11;
-(ENUM11 = ENUM1 || (ENUM1 = {
-}))[ENUM11.A = 0] = "A", ENUM11[ENUM11.B = 1] = "B", ENUM11[ENUM11[""] = 2] = "", ENUM1.A, ENUM1.A + ENUM1.B, ENUM1.A + ENUM1.B, ENUM1.A, ENUM1.A, ENUM1.B;
+var ENUM1, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM1.A, ENUM1.A + ENUM1.B, ENUM1.A + ENUM1.B, ENUM1.A, ENUM1.A, ENUM1.B;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es5.1.normal/output.js
index 29ca96c9727..ad5e6d95bb0 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es5.1.normal/output.js
@@ -1,10 +1,10 @@
 var // @allowUnreachableCode: true
 // ~ operator on enum type
 ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es5.2.minified/output.js
index d9d1855db2f..ac940c04281 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/bitwiseNotOperator/bitwiseNotOperatorWithEnumType/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM11;
-(ENUM11 = ENUM1 || (ENUM1 = {
-}))[ENUM11.A = 0] = "A", ENUM11[ENUM11.B = 1] = "B", ENUM11[ENUM11[""] = 2] = "", ENUM1.A, ENUM1.A + ENUM1.B, ENUM1.A + ENUM1.B, ENUM1.A, ENUM1.A, ENUM1.B;
+var ENUM1, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM1.A, ENUM1.A + ENUM1.B, ENUM1.A + ENUM1.B, ENUM1.A, ENUM1.A, ENUM1.B;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es2015.1.normal/output.js
index c076c601bc2..f7b417042a0 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // -- operator on enum type
 ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // expression
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es2015.2.minified/output.js
index efd75102cdd..08120e8acc4 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM11;
-(ENUM11 = ENUM1 || (ENUM1 = {
-}))[ENUM11.A = 0] = "A", ENUM11[ENUM11.B = 1] = "B", ENUM11[ENUM11[""] = 2] = "", --ENUM1.A, ENUM1.A--, --ENUM1.A, ENUM1[A]--;
+var ENUM1, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", --ENUM1.A, ENUM1.A--, --ENUM1.A, ENUM1[A]--;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es5.1.normal/output.js
index c076c601bc2..f7b417042a0 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // -- operator on enum type
 ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // expression
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es5.2.minified/output.js
index efd75102cdd..08120e8acc4 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumType/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM11;
-(ENUM11 = ENUM1 || (ENUM1 = {
-}))[ENUM11.A = 0] = "A", ENUM11[ENUM11.B = 1] = "B", ENUM11[ENUM11[""] = 2] = "", --ENUM1.A, ENUM1.A--, --ENUM1.A, ENUM1[A]--;
+var ENUM1, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", --ENUM1.A, ENUM1.A--, --ENUM1.A, ENUM1[A]--;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.1.normal/output.js
index 600804d8617..615594dd7f4 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.1.normal/output.js
@@ -4,10 +4,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.2.minified/output.js
index edf05e171ff..1055a5b87ce 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", --ENUM, --ENUM11, ENUM--, ENUM11--, --ENUM.A + ENUM.B, ENUM.A + ENUM.B--, --ENUM, --ENUM11, ENUM--, ENUM11--;
+var ENUM1, ENUM, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", --ENUM, --ENUM1, ENUM--, ENUM1--, --ENUM.A + ENUM.B, ENUM.A + ENUM.B--, --ENUM, --ENUM1, ENUM--, ENUM1--;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.1.normal/output.js
index 600804d8617..615594dd7f4 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.1.normal/output.js
@@ -4,10 +4,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.2.minified/output.js
index edf05e171ff..1055a5b87ce 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/decrementOperator/decrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", --ENUM, --ENUM11, ENUM--, ENUM11--, --ENUM.A + ENUM.B, ENUM.A + ENUM.B--, --ENUM, --ENUM11, ENUM--, ENUM11--;
+var ENUM1, ENUM, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", --ENUM, --ENUM1, ENUM--, ENUM1--, --ENUM.A + ENUM.B, ENUM.A + ENUM.B--, --ENUM, --ENUM1, ENUM--, ENUM1--;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es2015.1.normal/output.js
index f42a407fbe4..07292be8f32 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // ++ operator on enum type
 ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // expression
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es2015.2.minified/output.js
index 6116264c7fe..78b45bb31fb 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM11;
-(ENUM11 = ENUM1 || (ENUM1 = {
-}))[ENUM11.A = 0] = "A", ENUM11[ENUM11.B = 1] = "B", ENUM11[ENUM11[""] = 2] = "", ++ENUM1.B, ENUM1.B++, ++ENUM1.B, ENUM1.B++;
+var ENUM1, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ++ENUM1.B, ENUM1.B++, ++ENUM1.B, ENUM1.B++;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es5.1.normal/output.js
index f42a407fbe4..07292be8f32 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // ++ operator on enum type
 ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // expression
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es5.2.minified/output.js
index 6116264c7fe..78b45bb31fb 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumType/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM11;
-(ENUM11 = ENUM1 || (ENUM1 = {
-}))[ENUM11.A = 0] = "A", ENUM11[ENUM11.B = 1] = "B", ENUM11[ENUM11[""] = 2] = "", ++ENUM1.B, ENUM1.B++, ++ENUM1.B, ENUM1.B++;
+var ENUM1, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ++ENUM1.B, ENUM1.B++, ++ENUM1.B, ENUM1.B++;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.1.normal/output.js
index 8cd62df0e06..31b35341f90 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.1.normal/output.js
@@ -4,10 +4,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.2.minified/output.js
index afa44ef0944..11fe3a8a9b9 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ++ENUM, ++ENUM11, ENUM++, ENUM11++, ++ENUM[1] + ENUM[2], ENUM[1] + ENUM[2]++, ++ENUM, ++ENUM11, ENUM++, ENUM11++;
+var ENUM1, ENUM, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ++ENUM, ++ENUM1, ENUM++, ENUM1++, ++ENUM[1] + ENUM[2], ENUM[1] + ENUM[2]++, ++ENUM, ++ENUM1, ENUM++, ENUM1++;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.1.normal/output.js
index 8cd62df0e06..31b35341f90 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.1.normal/output.js
@@ -4,10 +4,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.2.minified/output.js
index afa44ef0944..11fe3a8a9b9 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/incrementOperator/incrementOperatorWithEnumTypeInvalidOperations/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ++ENUM, ++ENUM11, ENUM++, ENUM11++, ++ENUM[1] + ENUM[2], ENUM[1] + ENUM[2]++, ++ENUM, ++ENUM11, ENUM++, ENUM11++;
+var ENUM1, ENUM, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ++ENUM, ++ENUM1, ENUM++, ENUM1++, ++ENUM[1] + ENUM[2], ENUM[1] + ENUM[2]++, ++ENUM, ++ENUM1, ENUM++, ENUM1++;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es2015.1.normal/output.js
index 4df3b4d929d..a0720e3bcb1 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // ! operator on enum type
 ENUM;
-(function(ENUM2) {
-    ENUM2[ENUM2["A"] = 0] = "A";
-    ENUM2[ENUM2["B"] = 1] = "B";
-    ENUM2[ENUM2["C"] = 2] = "C";
+(function(ENUM) {
+    ENUM[ENUM["A"] = 0] = "A";
+    ENUM[ENUM["B"] = 1] = "B";
+    ENUM[ENUM["C"] = 2] = "C";
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es2015.2.minified/output.js
index 7dedaa6ff74..b742cfac511 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM, ENUM1;
-(ENUM = ENUM1 || (ENUM1 = {
-}))[ENUM.A = 0] = "A", ENUM[ENUM.B = 1] = "B", ENUM[ENUM.C = 2] = "C", ENUM1.B + ENUM1.C, ENUM1.B + ENUM1.C;
+var ENUM, ENUM;
+(ENUM = ENUM || (ENUM = {
+}))[ENUM.A = 0] = "A", ENUM[ENUM.B = 1] = "B", ENUM[ENUM.C = 2] = "C", ENUM.B, ENUM.B + ENUM.C, ENUM.B + ENUM.C, ENUM.B;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es5.1.normal/output.js
index 4df3b4d929d..a0720e3bcb1 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // ! operator on enum type
 ENUM;
-(function(ENUM2) {
-    ENUM2[ENUM2["A"] = 0] = "A";
-    ENUM2[ENUM2["B"] = 1] = "B";
-    ENUM2[ENUM2["C"] = 2] = "C";
+(function(ENUM) {
+    ENUM[ENUM["A"] = 0] = "A";
+    ENUM[ENUM["B"] = 1] = "B";
+    ENUM[ENUM["C"] = 2] = "C";
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es5.2.minified/output.js
index 7dedaa6ff74..b742cfac511 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/logicalNotOperator/logicalNotOperatorWithEnumType/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM, ENUM1;
-(ENUM = ENUM1 || (ENUM1 = {
-}))[ENUM.A = 0] = "A", ENUM[ENUM.B = 1] = "B", ENUM[ENUM.C = 2] = "C", ENUM1.B + ENUM1.C, ENUM1.B + ENUM1.C;
+var ENUM, ENUM;
+(ENUM = ENUM || (ENUM = {
+}))[ENUM.A = 0] = "A", ENUM[ENUM.B = 1] = "B", ENUM[ENUM.C = 2] = "C", ENUM.B, ENUM.B + ENUM.C, ENUM.B + ENUM.C, ENUM.B;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es2015.1.normal/output.js
index a1d7da6bc3a..9c045bb61f2 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es2015.1.normal/output.js
@@ -4,10 +4,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es2015.2.minified/output.js
index 3ae6eee9162..75c3bfb4e56 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM11.B, ENUM11.B + ENUM11[""], ENUM11.B;
+var ENUM1, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM1.B, ENUM1.B + ENUM1[""], ENUM1.B;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es5.1.normal/output.js
index a1d7da6bc3a..9c045bb61f2 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es5.1.normal/output.js
@@ -4,10 +4,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es5.2.minified/output.js
index 3ae6eee9162..75c3bfb4e56 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/negateOperator/negateOperatorWithEnumType/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM11.B, ENUM11.B + ENUM11[""], ENUM11.B;
+var ENUM1, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM1.B, ENUM1.B + ENUM1[""], ENUM1.B;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es2015.1.normal/output.js
index 30dae7002f9..365bee30ae4 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es2015.1.normal/output.js
@@ -4,10 +4,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es2015.2.minified/output.js
index 7529de1a72b..d39c228c4cd 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM11.A, ENUM[0] + ENUM11.B, ENUM11.B;
+var ENUM1, ENUM, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM1.A, ENUM[0] + ENUM1.B, ENUM1.B;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es5.1.normal/output.js
index 30dae7002f9..365bee30ae4 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es5.1.normal/output.js
@@ -4,10 +4,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es5.2.minified/output.js
index 7529de1a72b..d39c228c4cd 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/plusOperator/plusOperatorWithEnumType/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM11.A, ENUM[0] + ENUM11.B, ENUM11.B;
+var ENUM1, ENUM, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM1.A, ENUM[0] + ENUM1.B, ENUM1.B;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es2015.1.normal/output.js
index 0005bbc55c7..35a4a4af959 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es2015.1.normal/output.js
@@ -5,10 +5,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es2015.2.minified/output.js
index 3ea0ad4ae2f..f297a4d7bc4 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-var ENUM1, ENUM, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM11.A, ENUM[0] + ENUM11.B, ENUM[0] + ENUM11.B, ENUM11.B;
+var ENUM1, ENUM, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM1.A, ENUM[0] + ENUM1.B, ENUM[0] + ENUM1.B, ENUM1.B;
 z: ;
 z: ;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es5.1.normal/output.js
index ca5bf29a698..61f77a05240 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es5.1.normal/output.js
@@ -8,10 +8,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es5.2.minified/output.js
index 493426b2005..21c26f24de5 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/typeofOperator/typeofOperatorWithEnumType/input.ts/es5.2.minified/output.js
@@ -1,7 +1,7 @@
-var ENUM1, ENUM, ENUM11, _typeof = function(obj) {
+var ENUM1, ENUM, ENUM1, _typeof = function(obj) {
     return obj && "undefined" != typeof Symbol && obj.constructor === Symbol ? "symbol" : typeof obj;
 };
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", void 0 === ENUM || _typeof(ENUM), void 0 === ENUM11 || _typeof(ENUM11), _typeof(ENUM11.A), _typeof(ENUM[0] + ENUM11.B), _typeof(void 0 === ENUM ? "undefined" : _typeof(ENUM)), _typeof(_typeof(_typeof(ENUM[0] + ENUM11.B))), void 0 === ENUM || _typeof(ENUM), void 0 === ENUM11 || _typeof(ENUM11), _typeof(ENUM11.B), void 0 === ENUM || _typeof(ENUM);
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", void 0 === ENUM || _typeof(ENUM), void 0 === ENUM1 || _typeof(ENUM1), _typeof(ENUM1.A), _typeof(ENUM[0] + ENUM1.B), _typeof(void 0 === ENUM ? "undefined" : _typeof(ENUM)), _typeof(_typeof(_typeof(ENUM[0] + ENUM1.B))), void 0 === ENUM || _typeof(ENUM), void 0 === ENUM1 || _typeof(ENUM1), _typeof(ENUM1.B), void 0 === ENUM || _typeof(ENUM);
 z: void 0 === ENUM || _typeof(ENUM);
-z: void 0 === ENUM11 || _typeof(ENUM11);
+z: void 0 === ENUM1 || _typeof(ENUM1);
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es2015.1.normal/output.js
index 202c83066e1..a609783713b 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es2015.1.normal/output.js
@@ -4,10 +4,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es2015.2.minified/output.js
index fe9f72508a6..ac8e327a192 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM11.A, ENUM[0] + ENUM11.B, ENUM[0] + ENUM11.B, ENUM11.B;
+var ENUM1, ENUM, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM1.A, ENUM[0] + ENUM1.B, ENUM[0] + ENUM1.B, ENUM1.B;
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es5.1.normal/output.js
index 202c83066e1..a609783713b 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es5.1.normal/output.js
@@ -4,10 +4,10 @@ ENUM;
 })(ENUM || (ENUM = {
 }));
 var ENUM1;
-(function(ENUM11) {
-    ENUM11[ENUM11["A"] = 0] = "A";
-    ENUM11[ENUM11["B"] = 1] = "B";
-    ENUM11[ENUM11[""] = 2] = "";
+(function(ENUM1) {
+    ENUM1[ENUM1["A"] = 0] = "A";
+    ENUM1[ENUM1["B"] = 1] = "B";
+    ENUM1[ENUM1[""] = 2] = "";
 })(ENUM1 || (ENUM1 = {
 }));
 // enum type var
diff --git a/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es5.2.minified/output.js
index fe9f72508a6..ac8e327a192 100644
--- a/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/unaryOperators/voidOperator/voidOperatorWithEnumType/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var ENUM1, ENUM, ENUM11;
-(ENUM1 = ENUM11 || (ENUM11 = {
-}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM11.A, ENUM[0] + ENUM11.B, ENUM[0] + ENUM11.B, ENUM11.B;
+var ENUM1, ENUM, ENUM1;
+(ENUM1 = ENUM1 || (ENUM1 = {
+}))[ENUM1.A = 0] = "A", ENUM1[ENUM1.B = 1] = "B", ENUM1[ENUM1[""] = 2] = "", ENUM1.A, ENUM[0] + ENUM1.B, ENUM[0] + ENUM1.B, ENUM1.B;
diff --git a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es2015.1.normal/output.js
index fd0f4d911f1..412de8e3406 100644
--- a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es2015.1.normal/output.js
@@ -23,7 +23,7 @@ M = {
 }; // Error
 var M2;
 (function(M21) {
-    var M31;
+    let M31;
     (function(M3) {
         var x1;
         M3.x = x1;
@@ -76,8 +76,8 @@ function fn2(x2, y) {
     y['t'] = ''; // Error
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 E = undefined; // Error
diff --git a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es2015.2.minified/output.js
index 6c42806083e..a35b6cd5609 100644
--- a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var x, M, M2, E, E1;
+var x, M, M2, E, E;
 function fn() {
 }
 x = 3 = "", (function(M1) {
@@ -10,7 +10,8 @@ x = 3 = "", (function(M1) {
 } = {
     y: 3
 }, (function(M21) {
-    var M3, x1;
+    var x1;
+    let M3;
     (M3 || (M3 = {
     })).x = x1, M3 = {
         x: 3
@@ -29,8 +30,8 @@ x = 3 = "", (function(M1) {
 }, M2.M3 = {
     x: ""
 }, fn = ()=>3
-, (E1 = E || (E = {
-}))[E1.A = 0] = "A", E = void 0 = void 0;
+, (E = E || (E = {
+}))[E.A = 0] = "A", E = void 0 = void 0;
 class C {
 }
 C = void 0;
diff --git a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es5.1.normal/output.js
index 1ef83d973fc..dbc1cebde61 100644
--- a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es5.1.normal/output.js
@@ -83,8 +83,8 @@ function fn2(x2, y) {
     y['t'] = ''; // Error
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 E = undefined; // Error
diff --git a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es5.2.minified/output.js
index 5cff016f5d9..ce5ee1bcaf3 100644
--- a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignmentToParenthesizedIdentifiers/input.ts/es5.2.minified/output.js
@@ -29,9 +29,9 @@ x = 3 = "", (function(M1) {
     x: ""
 }, fn = function() {
     return 3;
-}, (E = E1 || (E1 = {
-}))[E.A = 0] = "A", E1 = void 0 = void 0;
-var E, x, M, M2, E1, C = function() {
+}, (E = E || (E = {
+}))[E.A = 0] = "A", E = void 0 = void 0;
+var E, x, M, M2, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
diff --git a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es2015.1.normal/output.js
index ce4a0808c71..c13274083f9 100644
--- a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es2015.1.normal/output.js
@@ -3,8 +3,8 @@ class C {
 }
 C = null; // Error
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 E = null; // Error
diff --git a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es2015.2.minified/output.js
index b4776169389..23b9e18b3bd 100644
--- a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-M = null, (E1 = E || (E = {
-}))[E1.A = 0] = "A", (E = null).A = null, I = null;
+var E, E;
+M = null, (E = E || (E = {
+}))[E.A = 0] = "A", (E = null).A = null, I = null;
diff --git a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es5.1.normal/output.js
index e60353a665d..8f216b0bc12 100644
--- a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es5.1.normal/output.js
@@ -10,8 +10,8 @@ var C = function C() {
 };
 C = null; // Error
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 E = null; // Error
diff --git a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es5.2.minified/output.js
index c34a6dbe66e..8d0604f38c9 100644
--- a/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/expressions/valuesAndReferences/assignments/input.ts/es5.2.minified/output.js
@@ -1,9 +1,9 @@
 M = null;
-var E, E1, C = function() {
+var E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-C = null, (E = E1 || (E1 = {
-}))[E.A = 0] = "A", (E1 = null).A = null, I = null;
+C = null, (E = E || (E = {
+}))[E.A = 0] = "A", (E = null).A = null, I = null;
diff --git a/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es2015.1.normal/output.js
index cfee5cb113f..838b3fc6857 100644
--- a/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 export var E1;
-(function(E11) {
-    E11[E11["A"] = 0] = "A";
-    E11[E11["B"] = 1] = "B";
-    E11[E11["C"] = 2] = "C";
+(function(E1) {
+    E1[E1["A"] = 0] = "A";
+    E1[E1["B"] = 1] = "B";
+    E1[E1["C"] = 2] = "C";
 })(E1 || (E1 = {
 }));
 // @Filename: foo_1.ts
diff --git a/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es2015.2.minified/output.js
index 05d561d1607..f215e6b892e 100644
--- a/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-var E1, E11;
-(E11 = E1 || (E1 = {
-}))[E11.A = 0] = "A", E11[E11.B = 1] = "B", E11[E11.C = 2] = "C";
+var E1, E1;
+(E1 = E1 || (E1 = {
+}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C";
 const foo = require("./foo_0");
 0 === foo.E1.A;
diff --git a/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es5.1.normal/output.js
index b9c2895a7d0..cf77d8bea5d 100644
--- a/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 export var E1;
-(function(E11) {
-    E11[E11["A"] = 0] = "A";
-    E11[E11["B"] = 1] = "B";
-    E11[E11["C"] = 2] = "C";
+(function(E1) {
+    E1[E1["A"] = 0] = "A";
+    E1[E1["B"] = 1] = "B";
+    E1[E1["C"] = 2] = "C";
 })(E1 || (E1 = {
 }));
 // @Filename: foo_1.ts
diff --git a/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es5.2.minified/output.js
index 9239714a94f..9b6c0c49bdd 100644
--- a/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/amdImportAsPrimaryExpression/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E1, E11;
-(E11 = E1 || (E1 = {
-}))[E11.A = 0] = "A", E11[E11.B = 1] = "B", E11[E11.C = 2] = "C", 0 === require("./foo_0").E1.A;
+var E1, E1;
+(E1 = E1 || (E1 = {
+}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", 0 === require("./foo_0").E1.A;
diff --git a/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es2015.1.normal/output.js
index 153c9b1c505..b6fe5df12ff 100644
--- a/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es2015.1.normal/output.js
@@ -7,10 +7,10 @@ export class C1 {
 }
 C1.s1 = true;
 export var E1;
-(function(E11) {
-    E11[E11["A"] = 0] = "A";
-    E11[E11["B"] = 1] = "B";
-    E11[E11["C"] = 2] = "C";
+(function(E1) {
+    E1[E1["A"] = 0] = "A";
+    E1[E1["B"] = 1] = "B";
+    E1[E1["C"] = 2] = "C";
 })(E1 || (E1 = {
 }));
 // @Filename: foo_1.ts
diff --git a/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es2015.2.minified/output.js
index 3f28f541312..54585c7e769 100644
--- a/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var E1, E11;
+var E1, E1;
 export class C1 {
     constructor(){
         this.m1 = 42;
     }
 }
-C1.s1 = !0, (E1 = E11 || (E11 = {
+C1.s1 = !0, (E1 = E1 || (E1 = {
 }))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", require("./foo_0");
diff --git a/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es5.1.normal/output.js
index 686fe2974ec..23aaf113d25 100644
--- a/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es5.1.normal/output.js
@@ -12,10 +12,10 @@ export var C1 = function C1() {
 };
 C1.s1 = true;
 export var E1;
-(function(E11) {
-    E11[E11["A"] = 0] = "A";
-    E11[E11["B"] = 1] = "B";
-    E11[E11["C"] = 2] = "C";
+(function(E1) {
+    E1[E1["A"] = 0] = "A";
+    E1[E1["B"] = 1] = "B";
+    E1[E1["C"] = 2] = "C";
 })(E1 || (E1 = {
 }));
 // @Filename: foo_1.ts
diff --git a/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es5.2.minified/output.js
index 65ad2959ef8..06ef9fb1916 100644
--- a/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/amdImportNotAsPrimaryExpression/input.ts/es5.2.minified/output.js
@@ -1,9 +1,8 @@
-var E1, E11, i, z, C1 = function() {
+export var E1, E1, i, z, C1 = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C1), this.m1 = 42;
 };
-export { E11 as E1 };
-C1.s1 = !0, (E1 = E11 || (E11 = {
+C1.s1 = !0, (E1 = E1 || (E1 = {
 }))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", require("./foo_0");
diff --git a/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es2015.1.normal/output.js
index 88c8ee5ea49..ecfd1b0d0ec 100644
--- a/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es2015.1.normal/output.js
@@ -7,10 +7,10 @@ export class C1 {
 }
 C1.s1 = true;
 export var E1;
-(function(E11) {
-    E11[E11["A"] = 0] = "A";
-    E11[E11["B"] = 1] = "B";
-    E11[E11["C"] = 2] = "C";
+(function(E1) {
+    E1[E1["A"] = 0] = "A";
+    E1[E1["B"] = 1] = "B";
+    E1[E1["C"] = 2] = "C";
 })(E1 || (E1 = {
 }));
 // @Filename: foo_1.ts
diff --git a/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es2015.2.minified/output.js
index 3f28f541312..54585c7e769 100644
--- a/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var E1, E11;
+var E1, E1;
 export class C1 {
     constructor(){
         this.m1 = 42;
     }
 }
-C1.s1 = !0, (E1 = E11 || (E11 = {
+C1.s1 = !0, (E1 = E1 || (E1 = {
 }))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", require("./foo_0");
diff --git a/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es5.1.normal/output.js
index 094a5fca7bd..8a58ba88084 100644
--- a/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es5.1.normal/output.js
@@ -12,10 +12,10 @@ export var C1 = function C1() {
 };
 C1.s1 = true;
 export var E1;
-(function(E11) {
-    E11[E11["A"] = 0] = "A";
-    E11[E11["B"] = 1] = "B";
-    E11[E11["C"] = 2] = "C";
+(function(E1) {
+    E1[E1["A"] = 0] = "A";
+    E1[E1["B"] = 1] = "B";
+    E1[E1["C"] = 2] = "C";
 })(E1 || (E1 = {
 }));
 // @Filename: foo_1.ts
diff --git a/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es5.2.minified/output.js
index 65ad2959ef8..06ef9fb1916 100644
--- a/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/commonJSImportNotAsPrimaryExpression/input.ts/es5.2.minified/output.js
@@ -1,9 +1,8 @@
-var E1, E11, i, z, C1 = function() {
+export var E1, E1, i, z, C1 = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C1), this.m1 = 42;
 };
-export { E11 as E1 };
-C1.s1 = !0, (E1 = E11 || (E11 = {
+C1.s1 = !0, (E1 = E1 || (E1 = {
 }))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", require("./foo_0");
diff --git a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es2015.1.normal/output.js
index a5744ac9a62..808565a6961 100644
--- a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es2015.1.normal/output.js
@@ -7,20 +7,20 @@ export class C {
 })(C || (C = {
 }));
 export var E;
-(function(E1) {
-    E1[E1["w"] = 1] = "w";
+(function(E) {
+    E[E["w"] = 1] = "w";
 })(E || (E = {
 }));
-(function(E2) {
-    E2[E2["x"] = 2] = "x";
+(function(E) {
+    E[E["x"] = 2] = "x";
 })(E || (E = {
 }));
-(function(E3) {
-    E3.y = 1;
+(function(E) {
+    E.y = 1;
 })(E || (E = {
 }));
-(function(E4) {
-    E4.z = 1;
+(function(E) {
+    E.z = 1;
 })(E || (E = {
 }));
 (function(N) {
diff --git a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es2015.2.minified/output.js
index 1247b0f71de..fab18a343c9 100644
--- a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es2015.2.minified/output.js
@@ -1,10 +1,10 @@
-var E, E1, E2;
+var E, E, E;
 export class C {
 }
 (C || (C = {
-})).x = 1, (E1 = E || (E = {
-}))[E1.w = 1] = "w", (E2 = E || (E = {
-}))[E2.x = 2] = "x", (E || (E = {
+})).x = 1, (E = E || (E = {
+}))[E.w = 1] = "w", (E = E || (E = {
+}))[E.x = 2] = "x", (E || (E = {
 })).y = 1, (E || (E = {
 })).z = 1, (N || (N = {
 })).x = 1;
diff --git a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es5.1.normal/output.js
index 46c31720f89..74c51d1045a 100644
--- a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es5.1.normal/output.js
@@ -14,20 +14,20 @@ export var C = function C() {
 })(C || (C = {
 }));
 export var E;
-(function(E1) {
-    E1[E1["w"] = 1] = "w";
+(function(E) {
+    E[E["w"] = 1] = "w";
 })(E || (E = {
 }));
-(function(E2) {
-    E2[E2["x"] = 2] = "x";
+(function(E) {
+    E[E["x"] = 2] = "x";
 })(E || (E = {
 }));
-(function(E3) {
-    E3.y = 1;
+(function(E) {
+    E.y = 1;
 })(E || (E = {
 }));
-(function(E4) {
-    E4.z = 1;
+(function(E) {
+    E.z = 1;
 })(E || (E = {
 }));
 (function(N) {
diff --git a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es5.2.minified/output.js
index 4bc9dc20889..e3e8e6fb001 100644
--- a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target12/input.ts/es5.2.minified/output.js
@@ -1,15 +1,14 @@
-var E, E1, E2, C = function() {
+export var E, E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-export { E1 as E, E2 as E };
 (C || (C = {
-})).x = 1, (E = E2 || (E2 = {
-}))[E.w = 1] = "w", (E1 = E2 || (E2 = {
-}))[E1.x = 2] = "x", (E2 || (E2 = {
-})).y = 1, (E2 || (E2 = {
+})).x = 1, (E = E || (E = {
+}))[E.w = 1] = "w", (E = E || (E = {
+}))[E.x = 2] = "x", (E || (E = {
+})).y = 1, (E || (E = {
 })).z = 1, (N || (N = {
 })).x = 1;
 export function F() {
diff --git a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es2015.1.normal/output.js
index 3e6b9c68df2..55833d3eec7 100644
--- a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es2015.1.normal/output.js
@@ -1,10 +1,10 @@
 export var E1;
-(function(E11) {
-    E11[E11["value1"] = 0] = "value1";
+(function(E1) {
+    E1[E1["value1"] = 0] = "value1";
 })(E1 || (E1 = {
 }));
 export var E2;
-(function(E21) {
-    E21[E21["value1"] = 0] = "value1";
+(function(E2) {
+    E2[E2["value1"] = 0] = "value1";
 })(E2 || (E2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es2015.2.minified/output.js
index 1fad1beba18..919f976bb18 100644
--- a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E1, E2, E11, E21;
-(E11 = E1 || (E1 = {
-}))[E11.value1 = 0] = "value1", (E21 = E2 || (E2 = {
-}))[E21.value1 = 0] = "value1";
+var E1, E2, E1, E2;
+(E1 = E1 || (E1 = {
+}))[E1.value1 = 0] = "value1", (E2 = E2 || (E2 = {
+}))[E2.value1 = 0] = "value1";
diff --git a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es5.1.normal/output.js
index 3e6b9c68df2..55833d3eec7 100644
--- a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es5.1.normal/output.js
@@ -1,10 +1,10 @@
 export var E1;
-(function(E11) {
-    E11[E11["value1"] = 0] = "value1";
+(function(E1) {
+    E1[E1["value1"] = 0] = "value1";
 })(E1 || (E1 = {
 }));
 export var E2;
-(function(E21) {
-    E21[E21["value1"] = 0] = "value1";
+(function(E2) {
+    E2[E2["value1"] = 0] = "value1";
 })(E2 || (E2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es5.2.minified/output.js
index 1fad1beba18..919f976bb18 100644
--- a/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/es6/es6modulekindWithES5Target5/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E1, E2, E11, E21;
-(E11 = E1 || (E1 = {
-}))[E11.value1 = 0] = "value1", (E21 = E2 || (E2 = {
-}))[E21.value1 = 0] = "value1";
+var E1, E2, E1, E2;
+(E1 = E1 || (E1 = {
+}))[E1.value1 = 0] = "value1", (E2 = E2 || (E2 = {
+}))[E2.value1 = 0] = "value1";
diff --git a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es2015.1.normal/output.js
index 1aefa88bf48..b9e1f10d458 100644
--- a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es2015.1.normal/output.js
@@ -7,20 +7,20 @@ export class C {
 })(C || (C = {
 }));
 export var E;
-(function(E1) {
-    E1[E1["w"] = 1] = "w";
+(function(E) {
+    E[E["w"] = 1] = "w";
 })(E || (E = {
 }));
-(function(E2) {
-    E2[E2["x"] = 2] = "x";
+(function(E) {
+    E[E["x"] = 2] = "x";
 })(E || (E = {
 }));
-(function(E3) {
-    E3.y = 1;
+(function(E) {
+    E.y = 1;
 })(E || (E = {
 }));
-(function(E4) {
-    E4.z = 1;
+(function(E) {
+    E.z = 1;
 })(E || (E = {
 }));
 (function(N) {
diff --git a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es2015.2.minified/output.js
index 1247b0f71de..fab18a343c9 100644
--- a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es2015.2.minified/output.js
@@ -1,10 +1,10 @@
-var E, E1, E2;
+var E, E, E;
 export class C {
 }
 (C || (C = {
-})).x = 1, (E1 = E || (E = {
-}))[E1.w = 1] = "w", (E2 = E || (E = {
-}))[E2.x = 2] = "x", (E || (E = {
+})).x = 1, (E = E || (E = {
+}))[E.w = 1] = "w", (E = E || (E = {
+}))[E.x = 2] = "x", (E || (E = {
 })).y = 1, (E || (E = {
 })).z = 1, (N || (N = {
 })).x = 1;
diff --git a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es5.1.normal/output.js
index 97b60d379fc..2ed213421c0 100644
--- a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es5.1.normal/output.js
@@ -14,20 +14,20 @@ export var C = function C() {
 })(C || (C = {
 }));
 export var E;
-(function(E1) {
-    E1[E1["w"] = 1] = "w";
+(function(E) {
+    E[E["w"] = 1] = "w";
 })(E || (E = {
 }));
-(function(E2) {
-    E2[E2["x"] = 2] = "x";
+(function(E) {
+    E[E["x"] = 2] = "x";
 })(E || (E = {
 }));
-(function(E3) {
-    E3.y = 1;
+(function(E) {
+    E.y = 1;
 })(E || (E = {
 }));
-(function(E4) {
-    E4.z = 1;
+(function(E) {
+    E.z = 1;
 })(E || (E = {
 }));
 (function(N) {
diff --git a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es5.2.minified/output.js
index 4bc9dc20889..e3e8e6fb001 100644
--- a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target12/input.ts/es5.2.minified/output.js
@@ -1,15 +1,14 @@
-var E, E1, E2, C = function() {
+export var E, E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-export { E1 as E, E2 as E };
 (C || (C = {
-})).x = 1, (E = E2 || (E2 = {
-}))[E.w = 1] = "w", (E1 = E2 || (E2 = {
-}))[E1.x = 2] = "x", (E2 || (E2 = {
-})).y = 1, (E2 || (E2 = {
+})).x = 1, (E = E || (E = {
+}))[E.w = 1] = "w", (E = E || (E = {
+}))[E.x = 2] = "x", (E || (E = {
+})).y = 1, (E || (E = {
 })).z = 1, (N || (N = {
 })).x = 1;
 export function F() {
diff --git a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es2015.1.normal/output.js
index 3e6b9c68df2..55833d3eec7 100644
--- a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es2015.1.normal/output.js
@@ -1,10 +1,10 @@
 export var E1;
-(function(E11) {
-    E11[E11["value1"] = 0] = "value1";
+(function(E1) {
+    E1[E1["value1"] = 0] = "value1";
 })(E1 || (E1 = {
 }));
 export var E2;
-(function(E21) {
-    E21[E21["value1"] = 0] = "value1";
+(function(E2) {
+    E2[E2["value1"] = 0] = "value1";
 })(E2 || (E2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es2015.2.minified/output.js
index 1fad1beba18..919f976bb18 100644
--- a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E1, E2, E11, E21;
-(E11 = E1 || (E1 = {
-}))[E11.value1 = 0] = "value1", (E21 = E2 || (E2 = {
-}))[E21.value1 = 0] = "value1";
+var E1, E2, E1, E2;
+(E1 = E1 || (E1 = {
+}))[E1.value1 = 0] = "value1", (E2 = E2 || (E2 = {
+}))[E2.value1 = 0] = "value1";
diff --git a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es5.1.normal/output.js
index 3e6b9c68df2..55833d3eec7 100644
--- a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es5.1.normal/output.js
@@ -1,10 +1,10 @@
 export var E1;
-(function(E11) {
-    E11[E11["value1"] = 0] = "value1";
+(function(E1) {
+    E1[E1["value1"] = 0] = "value1";
 })(E1 || (E1 = {
 }));
 export var E2;
-(function(E21) {
-    E21[E21["value1"] = 0] = "value1";
+(function(E2) {
+    E2[E2["value1"] = 0] = "value1";
 })(E2 || (E2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es5.2.minified/output.js
index 1fad1beba18..919f976bb18 100644
--- a/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/esnext/esnextmodulekindWithES5Target5/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E1, E2, E11, E21;
-(E11 = E1 || (E1 = {
-}))[E11.value1 = 0] = "value1", (E21 = E2 || (E2 = {
-}))[E21.value1 = 0] = "value1";
+var E1, E2, E1, E2;
+(E1 = E1 || (E1 = {
+}))[E1.value1 = 0] = "value1", (E2 = E2 || (E2 = {
+}))[E2.value1 = 0] = "value1";
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es2015.1.normal/output.js
index c1fe7f6e32e..cbcd306241b 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 export var E1;
-(function(E11) {
-    E11[E11["A"] = 0] = "A";
-    E11[E11["B"] = 1] = "B";
-    E11[E11["C"] = 2] = "C";
+(function(E1) {
+    E1[E1["A"] = 0] = "A";
+    E1[E1["B"] = 1] = "B";
+    E1[E1["C"] = 2] = "C";
 })(E1 || (E1 = {
 }));
 class C1 {
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es2015.2.minified/output.js
index cad26995eae..184b73e09f8 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E1, E11;
-(E11 = E1 || (E1 = {
-}))[E11.A = 0] = "A", E11[E11.B = 1] = "B", E11[E11.C = 2] = "C", module.exports = class {
+var E1, E1;
+(E1 = E1 || (E1 = {
+}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", module.exports = class {
 };
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es5.1.normal/output.js
index e5c115040d5..40eff201b00 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es5.1.normal/output.js
@@ -4,10 +4,10 @@ function _classCallCheck(instance, Constructor) {
     }
 }
 export var E1;
-(function(E11) {
-    E11[E11["A"] = 0] = "A";
-    E11[E11["B"] = 1] = "B";
-    E11[E11["C"] = 2] = "C";
+(function(E1) {
+    E1[E1["A"] = 0] = "A";
+    E1[E1["B"] = 1] = "B";
+    E1[E1["C"] = 2] = "C";
 })(E1 || (E1 = {
 }));
 var C1 = function C1() {
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es5.2.minified/output.js
index f0b056b1c65..7cb65f08630 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentAndDeclaration/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-(E11 = E1 || (E1 = {
-}))[E11.A = 0] = "A", E11[E11.B = 1] = "B", E11[E11.C = 2] = "C";
-var E1, E11, C1 = function() {
+(E1 = E1 || (E1 = {
+}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C";
+var E1, E1, C1 = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentMergedModule/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentMergedModule/input.ts/es2015.1.normal/output.js
index d3806146ffe..d1ad1bba4ba 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentMergedModule/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentMergedModule/input.ts/es2015.1.normal/output.js
@@ -14,7 +14,7 @@ var Foo;
         return a2;
     }
     Foo2.c = c;
-    var Test1;
+    let Test1;
     (function(Test) {
         Test.answer = 42;
     })(Test1 || (Test1 = {
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentMergedModule/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentMergedModule/input.ts/es2015.2.minified/output.js
index 83976031769..b321b3d00f4 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentMergedModule/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentMergedModule/input.ts/es2015.2.minified/output.js
@@ -3,10 +3,11 @@ var Foo, Foo1;
 })).a = function() {
     return 5;
 }, Foo1.b = !0, (function(Foo2) {
-    var Test;
     Foo2.c = function(a) {
         return a;
-    }, (Test || (Test = {
+    };
+    let Test;
+    (Test || (Test = {
     })).answer = 42, Foo2.Test = Test;
 })(Foo || (Foo = {
 })), module.exports = Foo;
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es2015.1.normal/output.js
index 55eb43a507f..a084df570a3 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
-a();
 // @esModuleInterop: true
 // @target: esnext
 // @filename: main.ts
 // @module: commonjs
 // https://github.com/microsoft/TypeScript/issues/39149
-export { };
+import a from "a";
+a();
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es2015.2.minified/output.js
index 1172057ec30..72798234eb2 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es2015.2.minified/output.js
@@ -1,2 +1,2 @@
+import a from "a";
 a();
-export { };
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es5.1.normal/output.js
index 55eb43a507f..a084df570a3 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es5.1.normal/output.js
@@ -1,7 +1,7 @@
-a();
 // @esModuleInterop: true
 // @target: esnext
 // @filename: main.ts
 // @module: commonjs
 // https://github.com/microsoft/TypeScript/issues/39149
-export { };
+import a from "a";
+a();
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es5.2.minified/output.js
index 1172057ec30..72798234eb2 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentOfExportNamespaceWithDefault/input.ts/es5.2.minified/output.js
@@ -1,2 +1,2 @@
+import a from "a";
 a();
-export { };
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es2015.1.normal/output.js
index 101d38c9fd8..d354c105eb0 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es2015.1.normal/output.js
@@ -1,14 +1,14 @@
 var // @module: amd
 // @Filename: foo_0.ts
 foo;
-(function(foo1) {
-    foo1[foo1["red"] = 0] = "red";
-    foo1[foo1["green"] = 1] = "green";
-    foo1[foo1["blue"] = 2] = "blue";
+(function(foo) {
+    foo[foo["red"] = 0] = "red";
+    foo[foo["green"] = 1] = "green";
+    foo[foo["blue"] = 2] = "blue";
 })(foo || (foo = {
 }));
-(function(foo2) {
-    foo2.answer = 42;
+(function(foo) {
+    foo.answer = 42;
 })(foo || (foo = {
 }));
 module.exports = foo;
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es2015.2.minified/output.js
index 575f9611888..bf38a4817ef 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var foo, color, foo1;
-(foo1 = foo || (foo = {
-}))[foo1.red = 0] = "red", foo1[foo1.green = 1] = "green", foo1[foo1.blue = 2] = "blue", (foo || (foo = {
+var foo, color, foo;
+(foo = foo || (foo = {
+}))[foo.red = 0] = "red", foo[foo.green = 1] = "green", foo[foo.blue = 2] = "blue", (foo || (foo = {
 })).answer = 42, module.exports = foo;
 const foo = require("./foo_0");
 color === foo.green && (color = foo.answer);
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es5.1.normal/output.js
index 9aea0b50017..a9416d3d7c5 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es5.1.normal/output.js
@@ -1,14 +1,14 @@
 var // @module: amd
 // @Filename: foo_0.ts
 foo;
-(function(foo1) {
-    foo1[foo1["red"] = 0] = "red";
-    foo1[foo1["green"] = 1] = "green";
-    foo1[foo1["blue"] = 2] = "blue";
+(function(foo) {
+    foo[foo["red"] = 0] = "red";
+    foo[foo["green"] = 1] = "green";
+    foo[foo["blue"] = 2] = "blue";
 })(foo || (foo = {
 }));
-(function(foo2) {
-    foo2.answer = 42;
+(function(foo) {
+    foo.answer = 42;
 })(foo || (foo = {
 }));
 module.exports = foo;
diff --git a/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es5.2.minified/output.js
index f3fe55ca098..7d876c43d62 100644
--- a/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/exportAssignmentTopLevelEnumdule/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-(foo = foo1 || (foo1 = {
-}))[foo.red = 0] = "red", foo[foo.green = 1] = "green", foo[foo.blue = 2] = "blue", (foo1 || (foo1 = {
-})).answer = 42, module.exports = foo1;
-var foo, foo1, color, foo1 = require("./foo_0");
-color === foo1.green && (color = foo1.answer);
+(foo = foo || (foo = {
+}))[foo.red = 0] = "red", foo[foo.green = 1] = "green", foo[foo.blue = 2] = "blue", (foo || (foo = {
+})).answer = 42, module.exports = foo;
+var foo, foo, color, foo = require("./foo_0");
+color === foo.green && (color = foo.answer);
 export { };
diff --git a/crates/swc/tests/tsc-references/externalModules/typeOnly/filterNamespace_import/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/typeOnly/filterNamespace_import/input.ts/es2015.1.normal/output.js
index b1b1a0f7f1f..60ca174968b 100644
--- a/crates/swc/tests/tsc-references/externalModules/typeOnly/filterNamespace_import/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/typeOnly/filterNamespace_import/input.ts/es2015.1.normal/output.js
@@ -5,7 +5,7 @@ var ns;
     }
     ns1.Class = Class;
     ns1.Value = "";
-    var nested1;
+    let nested1;
     (function(nested) {
         class NestedClass {
         }
diff --git a/crates/swc/tests/tsc-references/externalModules/typeOnly/filterNamespace_import/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/typeOnly/filterNamespace_import/input.ts/es2015.2.minified/output.js
index 8f0ae374c33..e5efbff8c1e 100644
--- a/crates/swc/tests/tsc-references/externalModules/typeOnly/filterNamespace_import/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/typeOnly/filterNamespace_import/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,9 @@
 var ns;
 !function(ns1) {
-    var nested;
     ns1.Class = class {
-    }, ns1.Value = "", (nested || (nested = {
+    }, ns1.Value = "";
+    let nested;
+    (nested || (nested = {
     })).NestedClass = class {
     }, ns1.nested = nested;
 }(ns || (ns = {
diff --git a/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es2015.1.normal/output.js
index ba8dd283d5f..5d48c182d01 100644
--- a/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es2015.1.normal/output.js
@@ -7,9 +7,9 @@ export { _class as default };
 export class A {
 }
 export var C;
-(function(C1) {
-    C1[C1["One"] = 0] = "One";
-    C1[C1["Two"] = 1] = "Two";
+(function(C) {
+    C[C["One"] = 0] = "One";
+    C[C["Two"] = 1] = "Two";
 })(C || (C = {
 }));
 let a;
@@ -41,9 +41,9 @@ console.log(h);
 const H = require('./h'); // noUnusedLocals error only
 var // @Filename: /k.ts
 K;
-(function(K1) {
-    K1[K1["One"] = 0] = "One";
-    K1[K1["Two"] = 1] = "Two";
+(function(K) {
+    K[K["One"] = 0] = "One";
+    K[K["Two"] = 1] = "Two";
 })(K || (K = {
 }));
 module.exports = K;
diff --git a/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es2015.2.minified/output.js
index 3b3ce62dbe9..3841401dd72 100644
--- a/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es2015.2.minified/output.js
@@ -1,9 +1,9 @@
-var C, K, C1, K1;
+var C, K, C, K;
 export { _class as default };
 export class A {
 }
-(C1 = C || (C = {
-}))[C1.One = 0] = "One", C1[C1.Two = 1] = "Two";
+(C = C || (C = {
+}))[C.One = 0] = "One", C[C.Two = 1] = "Two";
 let a, b;
 console.log(a, b);
 let a, b;
@@ -22,7 +22,7 @@ const H = require("./h");
 console.log({
 });
 const H = require("./h");
-(K1 = K || (K = {
-}))[K1.One = 0] = "One", K1[K1.Two = 1] = "Two", module.exports = K;
+(K = K || (K = {
+}))[K.One = 0] = "One", K[K.Two = 1] = "Two", module.exports = K;
 const K = require("./k");
 K.One;
diff --git a/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es5.1.normal/output.js
index f43ed2e4244..2eb6516ba9c 100644
--- a/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es5.1.normal/output.js
@@ -16,9 +16,9 @@ export var A = function A() {
     _classCallCheck(this, A);
 };
 export var C;
-(function(C1) {
-    C1[C1["One"] = 0] = "One";
-    C1[C1["Two"] = 1] = "Two";
+(function(C) {
+    C[C["One"] = 0] = "One";
+    C[C["Two"] = 1] = "Two";
 })(C || (C = {
 }));
 var a;
@@ -51,9 +51,9 @@ console.log(h);
 var H = require('./h'); // noUnusedLocals error only
 var // @Filename: /k.ts
 K;
-(function(K1) {
-    K1[K1["One"] = 0] = "One";
-    K1[K1["Two"] = 1] = "Two";
+(function(K) {
+    K[K["One"] = 0] = "One";
+    K[K["Two"] = 1] = "Two";
 })(K || (K = {
 }));
 module.exports = K;
diff --git a/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es5.2.minified/output.js
index 663d6e627ef..10f65329d5d 100644
--- a/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/externalModules/typeOnly/importsNotUsedAsValues_error/input.ts/es5.2.minified/output.js
@@ -10,8 +10,8 @@ export var A = function() {
     "use strict";
     _classCallCheck(this, A);
 };
-(C1 = C || (C = {
-}))[C1.One = 0] = "One", C1[C1.Two = 1] = "Two", console.log(a, b), console.log(a, b);
+(C = C || (C = {
+}))[C.One = 0] = "One", C[C.Two = 1] = "Two", console.log(a, b), console.log(a, b);
 var a = A;
 console.log(a, b), C.One;
 var c = C.Two, d = C.Two;
@@ -21,11 +21,11 @@ var H = function() {
     _classCallCheck(this, H);
 };
 module.exports = H;
-var C1, H = require("./h");
+var C, H = require("./h");
 console.log({
 });
-var K1, H = require("./h");
-(K1 = K || (K = {
-}))[K1.One = 0] = "One", K1[K1.Two = 1] = "Two", module.exports = K;
+var K, H = require("./h");
+(K = K || (K = {
+}))[K.One = 0] = "One", K[K.Two = 1] = "Two", module.exports = K;
 var K = require("./k");
 K.One;
diff --git a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es2015.1.normal/output.js
index 5ffe608ce82..09d5bc3e862 100644
--- a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es2015.1.normal/output.js
@@ -15,7 +15,7 @@ var M2;
 })(M2 || (M2 = {
 }));
 (function(M21) {
-    var M3;
+    let M3;
     (function(M3) {
         var a;
         var r1 = a.foo;
@@ -25,7 +25,8 @@ var M2;
     M21.M3 = M3;
 })(M2 || (M2 = {
 }));
-(function(M2) {
+(function(M22) {
+    let M3;
     (function(M3) {
         var a;
         var r1 = a.foo;
@@ -33,9 +34,11 @@ var M2;
         var r3 = a.baz;
     })(M3 || (M3 = {
     }));
+    M22.M3 = M3;
 })(M2 || (M2 = {
 }));
-(function(M2) {
+(function(M23) {
+    let M3;
     (function(M3) {
         var a;
         var r1 = a.foo;
@@ -43,5 +46,6 @@ var M2;
         var r3 = a.baz;
     })(M3 || (M3 = {
     }));
+    M23.M3 = M3;
 })(M2 || (M2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es2015.2.minified/output.js
index 91681d4d0b5..1625f2a9567 100644
--- a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es2015.2.minified/output.js
@@ -8,18 +8,21 @@ var M2;
     a.foo, a.bar, a.baz;
 })(M2 || (M2 = {
 })), (function(M21) {
-    var M3, a;
+    var a;
+    let M3;
     M3 || (M3 = {
     }), a.foo, a.bar, M21.M3 = M3;
 })(M2 || (M2 = {
-})), (function(M2) {
+})), (function(M22) {
     var a;
+    let M3;
     M3 || (M3 = {
-    }), a.foo, a.bar, a.baz;
+    }), a.foo, a.bar, a.baz, M22.M3 = M3;
 })(M2 || (M2 = {
-})), (function(M2) {
+})), (function(M23) {
     var a;
+    let M3;
     M3 || (M3 = {
-    }), a.foo, a.bar, a.baz;
+    }), a.foo, a.bar, a.baz, M23.M3 = M3;
 })(M2 || (M2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es5.1.normal/output.js
index 5ffe608ce82..dcf7975bf88 100644
--- a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es5.1.normal/output.js
@@ -25,7 +25,8 @@ var M2;
     M21.M3 = M3;
 })(M2 || (M2 = {
 }));
-(function(M2) {
+(function(M22) {
+    var M3;
     (function(M3) {
         var a;
         var r1 = a.foo;
@@ -33,9 +34,11 @@ var M2;
         var r3 = a.baz;
     })(M3 || (M3 = {
     }));
+    M22.M3 = M3;
 })(M2 || (M2 = {
 }));
-(function(M2) {
+(function(M23) {
+    var M3;
     (function(M3) {
         var a;
         var r1 = a.foo;
@@ -43,5 +46,6 @@ var M2;
         var r3 = a.baz;
     })(M3 || (M3 = {
     }));
+    M23.M3 = M3;
 })(M2 || (M2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es5.2.minified/output.js
index 91681d4d0b5..b84eb9fe1c8 100644
--- a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeThreeInterfaces2/input.ts/es5.2.minified/output.js
@@ -12,14 +12,14 @@ var M2;
     M3 || (M3 = {
     }), a.foo, a.bar, M21.M3 = M3;
 })(M2 || (M2 = {
-})), (function(M2) {
-    var a;
+})), (function(M22) {
+    var M3, a;
     M3 || (M3 = {
-    }), a.foo, a.bar, a.baz;
+    }), a.foo, a.bar, a.baz, M22.M3 = M3;
 })(M2 || (M2 = {
-})), (function(M2) {
-    var a;
+})), (function(M23) {
+    var M3, a;
     M3 || (M3 = {
-    }), a.foo, a.bar, a.baz;
+    }), a.foo, a.bar, a.baz, M23.M3 = M3;
 })(M2 || (M2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es2015.1.normal/output.js
index 4152156b280..589839ce7e9 100644
--- a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es2015.1.normal/output.js
@@ -14,7 +14,7 @@ var M2;
 })(M2 || (M2 = {
 }));
 (function(M21) {
-    var M3;
+    let M3;
     (function(M3) {
         var a;
         var r1 = a.foo;
@@ -24,12 +24,14 @@ var M2;
     M21.M3 = M3;
 })(M2 || (M2 = {
 }));
-(function(M2) {
+(function(M22) {
+    let M3;
     (function(M3) {
         var a;
         var r1 = a.foo;
         var r2 = a.bar;
     })(M3 || (M3 = {
     }));
+    M22.M3 = M3;
 })(M2 || (M2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es2015.2.minified/output.js
index 28f7b45defb..79b316d745e 100644
--- a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es2015.2.minified/output.js
@@ -8,13 +8,15 @@ var M2;
     a.foo, a.bar;
 })(M2 || (M2 = {
 })), (function(M21) {
-    var M3, a;
+    var a;
+    let M3;
     M3 || (M3 = {
     }), a.foo, a.bar, M21.M3 = M3;
 })(M2 || (M2 = {
-})), (function(M2) {
+})), (function(M22) {
     var a;
+    let M3;
     M3 || (M3 = {
-    }), a.foo, a.bar;
+    }), a.foo, a.bar, M22.M3 = M3;
 })(M2 || (M2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es5.1.normal/output.js
index 4152156b280..e68af4f6f58 100644
--- a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es5.1.normal/output.js
@@ -24,12 +24,14 @@ var M2;
     M21.M3 = M3;
 })(M2 || (M2 = {
 }));
-(function(M2) {
+(function(M22) {
+    var M3;
     (function(M3) {
         var a;
         var r1 = a.foo;
         var r2 = a.bar;
     })(M3 || (M3 = {
     }));
+    M22.M3 = M3;
 })(M2 || (M2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es5.2.minified/output.js
index 28f7b45defb..b48a145fb08 100644
--- a/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/declarationMerging/mergeTwoInterfaces2/input.ts/es5.2.minified/output.js
@@ -12,9 +12,9 @@ var M2;
     M3 || (M3 = {
     }), a.foo, a.bar, M21.M3 = M3;
 })(M2 || (M2 = {
-})), (function(M2) {
-    var a;
+})), (function(M22) {
+    var M3, a;
     M3 || (M3 = {
-    }), a.foo, a.bar;
+    }), a.foo, a.bar, M22.M3 = M3;
 })(M2 || (M2 = {
 }));
diff --git a/crates/swc/tests/tsc-references/interfaces/declarationMerging/twoInterfacesDifferentRootModule2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/declarationMerging/twoInterfacesDifferentRootModule2/input.ts/es2015.1.normal/output.js
index 1032cff08d7..80fa3d19186 100644
--- a/crates/swc/tests/tsc-references/interfaces/declarationMerging/twoInterfacesDifferentRootModule2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/declarationMerging/twoInterfacesDifferentRootModule2/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 // two interfaces with different root modules should not merge
 var M;
 (function(M) {
-    var M2;
+    let M2;
     (function(M2) {
         var a;
         var r1 = a.foo; // error
diff --git a/crates/swc/tests/tsc-references/interfaces/declarationMerging/twoInterfacesDifferentRootModule2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/declarationMerging/twoInterfacesDifferentRootModule2/input.ts/es2015.2.minified/output.js
index ad91e3d6296..d49c0c28c02 100644
--- a/crates/swc/tests/tsc-references/interfaces/declarationMerging/twoInterfacesDifferentRootModule2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/declarationMerging/twoInterfacesDifferentRootModule2/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,7 @@
 var M;
 !function(M) {
-    var a, b, M2, a1, b1;
+    var a, b, a1, b1;
+    let M2;
     M2 || (M2 = {
     }), a.foo, a.bar, b.foo, b.bar, a1.foo, a1.bar, b1.foo, b1.bar;
 }(M || (M = {
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es2015.1.normal/output.js
index bef31f87307..7d3b45cbf06 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es2015.1.normal/output.js
@@ -13,10 +13,10 @@ class C6 extends Constructor() {
 class C7 extends Constructor() {
 }
 var EX;
-(function(EX1) {
-    EX1[EX1["A"] = 0] = "A";
-    EX1[EX1["B"] = 1] = "B";
-    EX1[EX1["C"] = 2] = "C";
+(function(EX) {
+    EX[EX["A"] = 0] = "A";
+    EX[EX["B"] = 1] = "B";
+    EX[EX["C"] = 2] = "C";
 })(EX || (EX = {
 }));
 class C20 extends Constructor() {
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es2015.2.minified/output.js
index d7089e0effc..31f4966c71b 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var EX, EX1;
+var EX, EX;
 class C1 extends Constructor() {
 }
 class C2 extends Constructor() {
@@ -13,8 +13,8 @@ class C6 extends Constructor() {
 }
 class C7 extends Constructor() {
 }
-(EX1 = EX || (EX = {
-}))[EX1.A = 0] = "A", EX1[EX1.B = 1] = "B", EX1[EX1.C = 2] = "C";
+(EX = EX || (EX = {
+}))[EX.A = 0] = "A", EX[EX.B = 1] = "B", EX[EX.C = 2] = "C";
 class C20 extends Constructor() {
 }
 class C21 extends Constructor() {
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es5.1.normal/output.js
index 99f1fc6873b..c79c815eba5 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es5.1.normal/output.js
@@ -140,10 +140,10 @@ var C7 = /*#__PURE__*/ function(_super) {
     return C7;
 }(Constructor());
 var EX;
-(function(EX1) {
-    EX1[EX1["A"] = 0] = "A";
-    EX1[EX1["B"] = 1] = "B";
-    EX1[EX1["C"] = 2] = "C";
+(function(EX) {
+    EX[EX["A"] = 0] = "A";
+    EX[EX["B"] = 1] = "B";
+    EX[EX["C"] = 2] = "C";
 })(EX || (EX = {
 }));
 var C20 = /*#__PURE__*/ function(_super) {
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es5.2.minified/output.js
index ac863e5db3a..53075c11889 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection/input.ts/es5.2.minified/output.js
@@ -45,7 +45,7 @@ function _createSuper(Derived) {
         })(self);
     };
 }
-var EX, EX1, C1 = function(_super) {
+var EX, EX, C1 = function(_super) {
     "use strict";
     _inherits(C1, _super);
     var _super1 = _createSuper(C1);
@@ -102,8 +102,8 @@ var EX, EX1, C1 = function(_super) {
     }
     return C7;
 }(Constructor());
-(EX1 = EX || (EX = {
-}))[EX1.A = 0] = "A", EX1[EX1.B = 1] = "B", EX1[EX1.C = 2] = "C";
+(EX = EX || (EX = {
+}))[EX.A = 0] = "A", EX[EX.B = 1] = "B", EX[EX.C = 2] = "C";
 var C20 = function(_super) {
     "use strict";
     _inherits(C20, _super);
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es2015.1.normal/output.js
index 1f09dd196dc..b5288c9a607 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es2015.1.normal/output.js
@@ -9,9 +9,9 @@ class C4 extends Constructor() {
 class C5 extends Constructor() {
 }
 var EX;
-(function(EX1) {
-    EX1[EX1["A"] = 0] = "A";
-    EX1[EX1["B"] = 1] = "B";
-    EX1[EX1["C"] = 2] = "C";
+(function(EX) {
+    EX[EX["A"] = 0] = "A";
+    EX[EX["B"] = 1] = "B";
+    EX[EX["C"] = 2] = "C";
 })(EX || (EX = {
 }));
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es2015.2.minified/output.js
index a039af0c580..166de463ac1 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var EX, EX1;
+var EX, EX;
 class C1 extends Constructor() {
 }
 class C2 extends Constructor() {
@@ -9,5 +9,5 @@ class C4 extends Constructor() {
 }
 class C5 extends Constructor() {
 }
-(EX1 = EX || (EX = {
-}))[EX1.A = 0] = "A", EX1[EX1.B = 1] = "B", EX1[EX1.C = 2] = "C";
+(EX = EX || (EX = {
+}))[EX.A = 0] = "A", EX[EX.B = 1] = "B", EX[EX.C = 2] = "C";
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es5.1.normal/output.js
index b8ced6ab123..abd9100769d 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es5.1.normal/output.js
@@ -120,9 +120,9 @@ var C5 = /*#__PURE__*/ function(_super) {
     return C5;
 }(Constructor());
 var EX;
-(function(EX1) {
-    EX1[EX1["A"] = 0] = "A";
-    EX1[EX1["B"] = 1] = "B";
-    EX1[EX1["C"] = 2] = "C";
+(function(EX) {
+    EX[EX["A"] = 0] = "A";
+    EX[EX["B"] = 1] = "B";
+    EX[EX["C"] = 2] = "C";
 })(EX || (EX = {
 }));
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es5.2.minified/output.js
index a41cc75e73a..7e6c497b771 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors/input.ts/es5.2.minified/output.js
@@ -45,7 +45,7 @@ function _createSuper(Derived) {
         })(self);
     };
 }
-var EX, EX1, C1 = function(_super) {
+var EX, EX, C1 = function(_super) {
     "use strict";
     _inherits(C1, _super);
     var _super1 = _createSuper(C1);
@@ -86,5 +86,5 @@ var EX, EX1, C1 = function(_super) {
     }
     return C5;
 }(Constructor());
-(EX1 = EX || (EX = {
-}))[EX1.A = 0] = "A", EX1[EX1.B = 1] = "B", EX1[EX1.C = 2] = "C";
+(EX = EX || (EX = {
+}))[EX.A = 0] = "A", EX[EX.B = 1] = "B", EX[EX.C = 2] = "C";
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es2015.1.normal/output.js
index 50e4c5b92ff..5642e8706ef 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es2015.1.normal/output.js
@@ -8,8 +8,8 @@ var M;
 })(M || (M = {
 }));
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var a = {
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es2015.2.minified/output.js
index 377c1a8b41a..81fb85e7029 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-var E, M, E1;
+var E, M, E;
 (M || (M = {
-})).y = 1, (E = E1 || (E1 = {
+})).y = 1, (E = E || (E = {
 }))[E.A = 0] = "A", new class {
-}(), E1.A;
+}(), E.A;
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es5.1.normal/output.js
index 2d950f76574..93583973a44 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es5.1.normal/output.js
@@ -15,8 +15,8 @@ var M;
 })(M || (M = {
 }));
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var a = {
diff --git a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es5.2.minified/output.js
index 82836c6f8a5..caf96ad584e 100644
--- a/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/interfaces/interfaceDeclarations/interfaceWithPropertyOfEveryType/input.ts/es5.2.minified/output.js
@@ -1,9 +1,9 @@
-var E, M, E1, C = function() {
+var E, M, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
 (M || (M = {
-})).y = 1, (E = E1 || (E1 = {
-}))[E.A = 0] = "A", new C(), E1.A;
+})).y = 1, (E = E || (E = {
+}))[E.A = 0] = "A", new C(), E.A;
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
index 17917c4212a..e9c8d7bff52 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
@@ -1,17 +1,17 @@
 var enumdule;
-(function(enumdule1) {
-    enumdule1[enumdule1["Red"] = 0] = "Red";
-    enumdule1[enumdule1["Blue"] = 1] = "Blue";
+(function(enumdule) {
+    enumdule[enumdule["Red"] = 0] = "Red";
+    enumdule[enumdule["Blue"] = 1] = "Blue";
 })(enumdule || (enumdule = {
 }));
-(function(enumdule2) {
+(function(enumdule) {
     class Point {
         constructor(x1, y1){
             this.x = x1;
             this.y = y1;
         }
     }
-    enumdule2.Point = Point;
+    enumdule.Point = Point;
 })(enumdule || (enumdule = {
 }));
 var x;
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
index 9298fdbd858..e7cd0c3198e 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var enumdule, enumdule1;
-(enumdule = enumdule1 || (enumdule1 = {
-}))[enumdule.Red = 0] = "Red", enumdule[enumdule.Blue = 1] = "Blue", (enumdule1 || (enumdule1 = {
+var enumdule, enumdule;
+(enumdule = enumdule || (enumdule = {
+}))[enumdule.Red = 0] = "Red", enumdule[enumdule.Blue = 1] = "Blue", (enumdule || (enumdule = {
 })).Point = class {
     constructor(x, y){
         this.x = x, this.y = y;
     }
-}, enumdule1.Red, new enumdule1.Point(0, 0);
+}, enumdule.Red, new enumdule.Point(0, 0);
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
index ee2d0b54dbb..9962a3cf0f0 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
@@ -4,19 +4,19 @@ function _classCallCheck(instance, Constructor) {
     }
 }
 var enumdule;
-(function(enumdule1) {
-    enumdule1[enumdule1["Red"] = 0] = "Red";
-    enumdule1[enumdule1["Blue"] = 1] = "Blue";
+(function(enumdule) {
+    enumdule[enumdule["Red"] = 0] = "Red";
+    enumdule[enumdule["Blue"] = 1] = "Blue";
 })(enumdule || (enumdule = {
 }));
-(function(enumdule2) {
+(function(enumdule) {
     var Point = function Point(x1, y1) {
         "use strict";
         _classCallCheck(this, Point);
         this.x = x1;
         this.y = y1;
     };
-    enumdule2.Point = Point;
+    enumdule.Point = Point;
 })(enumdule || (enumdule = {
 }));
 var x;
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
index 11b3c63c9f1..d6c3787488a 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/EnumAndModuleWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
@@ -1,12 +1,12 @@
-var enumdule, enumdule1;
-(enumdule = enumdule1 || (enumdule1 = {
-}))[enumdule.Red = 0] = "Red", enumdule[enumdule.Blue = 1] = "Blue", (function(enumdule2) {
+var enumdule, enumdule;
+(enumdule = enumdule || (enumdule = {
+}))[enumdule.Red = 0] = "Red", enumdule[enumdule.Blue = 1] = "Blue", (function(enumdule1) {
     var Point = function(x, y) {
         "use strict";
         (function(instance, Constructor) {
             if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
         })(this, Point), this.x = x, this.y = y;
     };
-    enumdule2.Point = Point;
-})(enumdule1 || (enumdule1 = {
-})), enumdule1.Red, new enumdule1.Point(0, 0);
+    enumdule1.Point = Point;
+})(enumdule || (enumdule = {
+})), enumdule.Red, new enumdule.Point(0, 0);
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
index 05427ac4485..3452dcaf729 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
@@ -10,14 +10,16 @@ var A;
     A1.Point = Point;
 })(A || (A = {
 }));
-(function(A) {
+(function(A2) {
+    let Point1;
     (function(Point) {
         Point.Origin = {
             x: 0,
             y: 0
         };
-    })(Point || (Point = {
+    })(Point1 || (Point1 = {
     }));
+    A2.Point = Point1;
 })(A || (A = {
 }));
 // @filename: test.ts
@@ -29,19 +31,19 @@ var cl = A.Point.Origin; // not expected to be an error.
 // @filename: simple.ts
 var B;
 (function(B1) {
-    function Point1() {
+    function Point2() {
         return {
             x: 0,
             y: 0
         };
     }
-    B1.Point = Point1;
+    B1.Point = Point2;
     (function(Point) {
         Point.Origin = {
             x: 0,
             y: 0
         };
-    })(Point1 || (Point1 = {
+    })(Point2 || (Point2 = {
     }));
 })(B || (B = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
index e030d31949a..9630c5764c9 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
@@ -5,12 +5,15 @@ var A, B;
         x: 0,
         y: 0
     };
-}, A || (A = {
-}), (Point || (Point = {
-})).Origin = {
-    x: 0,
-    y: 0
-}, A.Point, A.Point(), A.Point.Origin, (function(B1) {
+}, (function(A1) {
+    let Point;
+    (Point || (Point = {
+    })).Origin = {
+        x: 0,
+        y: 0
+    }, A1.Point = Point;
+})(A || (A = {
+})), A.Point, A.Point(), A.Point.Origin, (function(B1) {
     function Point() {
         return {
             x: 0,
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
index 89e33a0adfb..169e002e4d3 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
@@ -10,14 +10,16 @@ var A;
     A1.Point = Point;
 })(A || (A = {
 }));
-(function(A) {
+(function(A2) {
+    var Point1;
     (function(Point) {
         Point.Origin = {
             x: 0,
             y: 0
         };
-    })(Point || (Point = {
+    })(Point1 || (Point1 = {
     }));
+    A2.Point = Point1;
 })(A || (A = {
 }));
 // @filename: test.ts
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
index 75daf6f3dcb..850c912385b 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
@@ -5,12 +5,15 @@ var A, B;
         x: 0,
         y: 0
     };
-}, A || (A = {
-}), (Point || (Point = {
-})).Origin = {
-    x: 0,
-    y: 0
-}, A.Point, A.Point(), A.Point.Origin, (function(B1) {
+}, (function(A1) {
+    var Point;
+    (Point || (Point = {
+    })).Origin = {
+        x: 0,
+        y: 0
+    }, A1.Point = Point;
+})(A || (A = {
+})), A.Point, A.Point(), A.Point.Origin, (function(B1) {
     var Point = function() {
         return {
             x: 0,
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es2015.1.normal/output.js
index f571ae5fbed..ca3c286a0d0 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es2015.1.normal/output.js
@@ -12,14 +12,16 @@ var A;
 }));
 // @filename: module.ts
 var B;
-(function(B) {
+(function(B1) {
+    let Point1;
     (function(Point) {
         Point.Origin = {
             x: 0,
             y: 0
         };
-    })(Point || (Point = {
+    })(Point1 || (Point1 = {
     }));
+    B1.Point = Point1;
 })(B || (B = {
 }));
 // @filename: test.ts
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es2015.2.minified/output.js
index 288f0d417b4..86b637ce8ed 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es2015.2.minified/output.js
@@ -5,9 +5,12 @@ var A, B;
         x: 0,
         y: 0
     };
-}, B || (B = {
-}), (Point || (Point = {
-})).Origin = {
-    x: 0,
-    y: 0
-}, A.Point, B.Point.Origin;
+}, (function(B1) {
+    let Point;
+    (Point || (Point = {
+    })).Origin = {
+        x: 0,
+        y: 0
+    }, B1.Point = Point;
+})(B || (B = {
+})), A.Point, B.Point.Origin;
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es5.1.normal/output.js
index ac2a014a5fe..ac458baaa49 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es5.1.normal/output.js
@@ -12,14 +12,16 @@ var A;
 }));
 // @filename: module.ts
 var B;
-(function(B) {
+(function(B1) {
+    var Point1;
     (function(Point) {
         Point.Origin = {
             x: 0,
             y: 0
         };
-    })(Point || (Point = {
+    })(Point1 || (Point1 = {
     }));
+    B1.Point = Point1;
 })(B || (B = {
 }));
 // @filename: test.ts
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es5.2.minified/output.js
index 288f0d417b4..f9ace49bc4e 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/FunctionAndModuleWithSameNameAndDifferentCommonRoot/input.ts/es5.2.minified/output.js
@@ -5,9 +5,12 @@ var A, B;
         x: 0,
         y: 0
     };
-}, B || (B = {
-}), (Point || (Point = {
-})).Origin = {
-    x: 0,
-    y: 0
-}, A.Point, B.Point.Origin;
+}, (function(B1) {
+    var Point;
+    (Point || (Point = {
+    })).Origin = {
+        x: 0,
+        y: 0
+    }, B1.Point = Point;
+})(B || (B = {
+})), A.Point, B.Point.Origin;
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
index fdc5f47eed2..729f995a910 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
@@ -9,9 +9,9 @@ var enumdule;
     enumdule1.Point = Point;
 })(enumdule || (enumdule = {
 }));
-(function(enumdule2) {
-    enumdule2[enumdule2["Red"] = 0] = "Red";
-    enumdule2[enumdule2["Blue"] = 1] = "Blue";
+(function(enumdule) {
+    enumdule[enumdule["Red"] = 0] = "Red";
+    enumdule[enumdule["Blue"] = 1] = "Blue";
 })(enumdule || (enumdule = {
 }));
 var x;
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
index fa0d71f6a24..ab7314b13c4 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var enumdule, enumdule1;
-(enumdule1 || (enumdule1 = {
+var enumdule, enumdule;
+(enumdule || (enumdule = {
 })).Point = class {
     constructor(x, y){
         this.x = x, this.y = y;
     }
-}, (enumdule = enumdule1 || (enumdule1 = {
-}))[enumdule.Red = 0] = "Red", enumdule[enumdule.Blue = 1] = "Blue", enumdule1.Red, new enumdule1.Point(0, 0);
+}, (enumdule = enumdule || (enumdule = {
+}))[enumdule.Red = 0] = "Red", enumdule[enumdule.Blue = 1] = "Blue", enumdule.Red, new enumdule.Point(0, 0);
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
index ad2c60ac432..9a372d3448c 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
@@ -14,9 +14,9 @@ var enumdule;
     enumdule1.Point = Point;
 })(enumdule || (enumdule = {
 }));
-(function(enumdule2) {
-    enumdule2[enumdule2["Red"] = 0] = "Red";
-    enumdule2[enumdule2["Blue"] = 1] = "Blue";
+(function(enumdule) {
+    enumdule[enumdule["Red"] = 0] = "Red";
+    enumdule[enumdule["Blue"] = 1] = "Blue";
 })(enumdule || (enumdule = {
 }));
 var x;
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
index b32194c6795..85d655d348d 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndEnumWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
@@ -1,12 +1,12 @@
-var enumdule, enumdule1;
-!function(enumdule2) {
+var enumdule, enumdule;
+!function(enumdule1) {
     var Point = function(x, y) {
         "use strict";
         (function(instance, Constructor) {
             if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
         })(this, Point), this.x = x, this.y = y;
     };
-    enumdule2.Point = Point;
-}(enumdule1 || (enumdule1 = {
-})), (enumdule = enumdule1 || (enumdule1 = {
-}))[enumdule.Red = 0] = "Red", enumdule[enumdule.Blue = 1] = "Blue", enumdule1.Red, new enumdule1.Point(0, 0);
+    enumdule1.Point = Point;
+}(enumdule || (enumdule = {
+})), (enumdule = enumdule || (enumdule = {
+}))[enumdule.Red = 0] = "Red", enumdule[enumdule.Blue = 1] = "Blue", enumdule.Red, new enumdule.Point(0, 0);
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
index 39990a3abc8..bb43ca86232 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es2015.1.normal/output.js
@@ -1,23 +1,25 @@
 // @filename: module.ts
 var A;
-(function(A) {
+(function(A1) {
+    let Point1;
     (function(Point) {
         Point.Origin = {
             x: 0,
             y: 0
         };
-    })(Point || (Point = {
+    })(Point1 || (Point1 = {
     }));
+    A1.Point = Point1;
 })(A || (A = {
 }));
-(function(A1) {
+(function(A2) {
     function Point() {
         return {
             x: 0,
             y: 0
         };
     }
-    A1.Point = Point;
+    A2.Point = Point;
 })(A || (A = {
 }));
 // @filename: simple.ts
@@ -28,14 +30,14 @@ var B;
             x: 0,
             y: 0
         };
-    })(Point1 || (Point1 = {
+    })(Point2 || (Point2 = {
     }));
-    function Point1() {
+    function Point2() {
         return {
             x: 0,
             y: 0
         };
     }
-    B1.Point = Point1;
+    B1.Point = Point2;
 })(B || (B = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
index cd927dff3cf..eab6c9d55ba 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es2015.2.minified/output.js
@@ -1,10 +1,13 @@
 var A, B;
-A || (A = {
-}), (Point || (Point = {
-})).Origin = {
-    x: 0,
-    y: 0
-}, (A || (A = {
+!function(A1) {
+    let Point;
+    (Point || (Point = {
+    })).Origin = {
+        x: 0,
+        y: 0
+    }, A1.Point = Point;
+}(A || (A = {
+})), (A || (A = {
 })).Point = function() {
     return {
         x: 0,
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
index 257734910e8..1a415c56477 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es5.1.normal/output.js
@@ -1,23 +1,25 @@
 // @filename: module.ts
 var A;
-(function(A) {
+(function(A1) {
+    var Point1;
     (function(Point) {
         Point.Origin = {
             x: 0,
             y: 0
         };
-    })(Point || (Point = {
+    })(Point1 || (Point1 = {
     }));
+    A1.Point = Point1;
 })(A || (A = {
 }));
-(function(A1) {
+(function(A2) {
     var Point = function Point() {
         return {
             x: 0,
             y: 0
         };
     };
-    A1.Point = Point;
+    A2.Point = Point;
 })(A || (A = {
 }));
 // @filename: simple.ts
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
index 2ef03836b73..b3ee0bd5a08 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/ModuleAndFunctionWithSameNameAndCommonRoot/input.ts/es5.2.minified/output.js
@@ -1,10 +1,13 @@
 var A, B;
-A || (A = {
-}), (Point || (Point = {
-})).Origin = {
-    x: 0,
-    y: 0
-}, (A || (A = {
+!function(A1) {
+    var Point;
+    (Point || (Point = {
+    })).Origin = {
+        x: 0,
+        y: 0
+    }, A1.Point = Point;
+}(A || (A = {
+})), (A || (A = {
 })).Point = function() {
     return {
         x: 0,
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedClassesOfTheSameName/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedClassesOfTheSameName/input.ts/es2015.1.normal/output.js
index 71cb129c035..ee44b8a2ed5 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedClassesOfTheSameName/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedClassesOfTheSameName/input.ts/es2015.1.normal/output.js
@@ -21,9 +21,9 @@ var p;
 var p;
 var X;
 (function(X1) {
-    var Y1;
+    let Y1;
     (function(Y) {
-        var Z;
+        let Z;
         (function(Z) {
             class Line {
             }
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedClassesOfTheSameName/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedClassesOfTheSameName/input.ts/es2015.2.minified/output.js
index 8d91a4cff27..4cd998ab949 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedClassesOfTheSameName/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedClassesOfTheSameName/input.ts/es2015.2.minified/output.js
@@ -2,7 +2,7 @@ var A, X;
 (A || (A = {
 })).Point = class {
 }, (function(X1) {
-    var Y, Z;
+    let Y, Z;
     (Y || (Y = {
     })).Z = Z, X1.Y = Y;
 })(X || (X = {
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es2015.1.normal/output.js
index 67310a22170..c7da3a990a7 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 //@filename: part1.ts
 var A;
 (function(A1) {
-    var Utils1;
+    let Utils1;
     (function(Utils) {
         function mirror(p1) {
             return {
@@ -19,9 +19,10 @@ var A;
     A1.Utils = Utils1;
 })(A || (A = {
 }));
-(function(A) {
+(function(A2) {
     // not a collision, since we don't export
     var Origin = "0,0";
+    let Utils2;
     (function(Utils) {
         class Plane {
             constructor(tl, br){
@@ -30,8 +31,9 @@ var A;
             }
         }
         Utils.Plane = Plane;
-    })(Utils || (Utils = {
+    })(Utils2 || (Utils2 = {
     }));
+    A2.Utils = Utils2;
 })(A || (A = {
 }));
 //@filename: part3.ts
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es2015.2.minified/output.js
index 47f5ae80b26..bb832f3b1cb 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
 !function(A1) {
-    var Utils;
+    let Utils;
     (Utils || (Utils = {
     })).mirror = function(p) {
         return {
@@ -11,13 +11,16 @@
         y: 0
     }, A1.Utils = Utils;
 }(A || (A = {
-})), A || (A = {
-}), (Utils || (Utils = {
-})).Plane = class {
-    constructor(tl, br){
-        this.tl = tl, this.br = br;
-    }
-};
+})), (function(A2) {
+    let Utils;
+    (Utils || (Utils = {
+    })).Plane = class {
+        constructor(tl, br){
+            this.tl = tl, this.br = br;
+        }
+    }, A2.Utils = Utils;
+})(A || (A = {
+}));
 var A, o, o, o = A.Origin, o = A.Utils.mirror(o);
 new A.Utils.Plane(o, {
     x: 1,
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es5.1.normal/output.js
index e8935195d8d..ee1c0ace80b 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es5.1.normal/output.js
@@ -24,9 +24,10 @@ var A;
     A1.Utils = Utils1;
 })(A || (A = {
 }));
-(function(A) {
+(function(A2) {
     // not a collision, since we don't export
     var Origin = "0,0";
+    var Utils2;
     (function(Utils) {
         var Plane = function Plane(tl, br) {
             "use strict";
@@ -35,8 +36,9 @@ var A;
             this.br = br;
         };
         Utils.Plane = Plane;
-    })(Utils || (Utils = {
+    })(Utils2 || (Utils2 = {
     }));
+    A2.Utils = Utils2;
 })(A || (A = {
 }));
 //@filename: part3.ts
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es5.2.minified/output.js
index 4a23ddbfe45..ce598c141c9 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedAndNonExportedLocalVarsOfTheSameName/input.ts/es5.2.minified/output.js
@@ -11,15 +11,15 @@
         y: 0
     }, A1.Utils = Utils;
 }(A || (A = {
-})), (function(A) {
-    var Utils1, Plane;
+})), (function(A2) {
+    var Utils, Utils1, Plane;
     Utils1 = Utils || (Utils = {
     }), Plane = function(tl, br) {
         "use strict";
         (function(instance, Constructor) {
             if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
         })(this, Plane), this.tl = tl, this.br = br;
-    }, Utils1.Plane = Plane;
+    }, Utils1.Plane = Plane, A2.Utils = Utils;
 })(A || (A = {
 }));
 var A, o, o, o = A.Origin, o = A.Utils.mirror(o);
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedClassesOfTheSameName/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedClassesOfTheSameName/input.ts/es2015.1.normal/output.js
index 0d1e3519594..0affa693ef0 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedClassesOfTheSameName/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedClassesOfTheSameName/input.ts/es2015.1.normal/output.js
@@ -13,9 +13,9 @@ var A;
 }));
 var X;
 (function(X1) {
-    var Y1;
+    let Y1;
     (function(Y) {
-        var Z1;
+        let Z1;
         (function(Z) {
             class Line {
             }
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedClassesOfTheSameName/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedClassesOfTheSameName/input.ts/es2015.2.minified/output.js
index d667f0a625c..4ded2684026 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedClassesOfTheSameName/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedClassesOfTheSameName/input.ts/es2015.2.minified/output.js
@@ -4,10 +4,11 @@ var A, X;
 }, (A || (A = {
 })).Point = class {
 }, (function(X1) {
-    var Y, Y1, Z;
-    Y1 = Y || (Y = {
+    var Y;
+    let Y1, Z;
+    Y = Y1 || (Y1 = {
     }), (Z || (Z = {
     })).Line = class {
-    }, Y1.Z = Z, X1.Y = Y;
+    }, Y.Z = Z, X1.Y = Y1;
 })(X || (X = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es2015.1.normal/output.js
index 52d0f858f61..b22e24e57ba 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 //@filename: part1.ts
 export var A;
 (function(A1) {
-    var Utils1;
+    let Utils1;
     (function(Utils) {
         function mirror(p) {
             return {
@@ -24,6 +24,7 @@ export var A;
         x: 0,
         y: 0
     };
+    let Utils2;
     (function(Utils) {
         class Plane {
             constructor(tl, br){
@@ -32,7 +33,8 @@ export var A;
             }
         }
         Utils.Plane = Plane;
-    })(Utils || (Utils = {
+    })(Utils2 || (Utils2 = {
     }));
+    A2.Utils = Utils2;
 })(A || (A = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es2015.2.minified/output.js
index c75d2966153..eb462295d19 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var A;
+export var A;
 !function(A1) {
-    var Utils;
+    let Utils;
     (Utils || (Utils = {
     })).mirror = function(p) {
         return {
@@ -12,13 +12,17 @@ var A;
         y: 0
     }, A1.Utils = Utils;
 }(A || (A = {
-})), (A || (A = {
-})).Origin = {
-    x: 0,
-    y: 0
-}, (Utils || (Utils = {
-})).Plane = class {
-    constructor(tl, br){
-        this.tl = tl, this.br = br;
-    }
-};
+})), (function(A2) {
+    A2.Origin = {
+        x: 0,
+        y: 0
+    };
+    let Utils;
+    (Utils || (Utils = {
+    })).Plane = class {
+        constructor(tl, br){
+            this.tl = tl, this.br = br;
+        }
+    }, A2.Utils = Utils;
+})(A || (A = {
+}));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es5.1.normal/output.js
index f6ce4815c58..8aa19cde310 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es5.1.normal/output.js
@@ -29,6 +29,7 @@ export var A;
         x: 0,
         y: 0
     };
+    var Utils2;
     (function(Utils) {
         var Plane = function Plane(tl, br) {
             "use strict";
@@ -37,7 +38,8 @@ export var A;
             this.br = br;
         };
         Utils.Plane = Plane;
-    })(Utils || (Utils = {
+    })(Utils2 || (Utils2 = {
     }));
+    A2.Utils = Utils2;
 })(A || (A = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es5.2.minified/output.js
index ce6c868152f..7dcef3d5a0a 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedLocalVarsOfTheSameName/input.ts/es5.2.minified/output.js
@@ -13,7 +13,7 @@ export var A;
     }, A1.Utils = Utils;
 }(A || (A = {
 })), (function(A2) {
-    var Utils1, Plane;
+    var Utils, Utils1, Plane;
     A2.Origin = {
         x: 0,
         y: 0
@@ -23,6 +23,6 @@ export var A;
         (function(instance, Constructor) {
             if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
         })(this, Plane), this.tl = tl, this.br = br;
-    }, Utils1.Plane = Plane;
+    }, Utils1.Plane = Plane, A2.Utils = Utils;
 })(A || (A = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedModulesOfTheSameName/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedModulesOfTheSameName/input.ts/es2015.1.normal/output.js
index 1f4b4c4fa24..dd79f978ead 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedModulesOfTheSameName/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedModulesOfTheSameName/input.ts/es2015.1.normal/output.js
@@ -1,6 +1,6 @@
 var A;
 (function(A) {
-    var B1;
+    let B1;
     (function(B) {
         var x1;
         B.x = x1;
@@ -13,9 +13,9 @@ var x;
 var x = A.B.x;
 var X;
 (function(X1) {
-    var Y;
+    let Y;
     (function(Y) {
-        var Z1;
+        let Z1;
         (function(Z) {
             class Line {
             }
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedModulesOfTheSameName/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedModulesOfTheSameName/input.ts/es2015.2.minified/output.js
index 83a7fa3c5d5..05e54c5dd91 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedModulesOfTheSameName/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesThatMergeEachWithExportedModulesOfTheSameName/input.ts/es2015.2.minified/output.js
@@ -1,11 +1,12 @@
 var A, X;
 !function(A) {
-    var B, x;
+    var x;
+    let B;
     (B || (B = {
     })).x = x;
 }(A || (A = {
 })), A.B.x, (function(X1) {
-    var Y, Z;
+    let Y, Z;
     Y || (Y = {
     }), (Z || (Z = {
     })).Line = class {
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es2015.1.normal/output.js
index cd70a4545e8..4768d05a67f 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 //@filename: part1.ts
 var Root;
 (function(Root1) {
-    var A1;
+    let A1;
     (function(A) {
-        var Utils1;
+        let Utils1;
         (function(Utils) {
             function mirror(p) {
                 return {
@@ -22,12 +22,14 @@ var Root;
 }));
 //@filename: part2.ts
 var otherRoot;
-(function(otherRoot) {
+(function(otherRoot1) {
+    let A2;
     (function(A) {
         A.Origin = {
             x: 0,
             y: 0
         };
+        let Utils2;
         (function(Utils) {
             class Plane {
                 constructor(tl, br){
@@ -36,9 +38,11 @@ var otherRoot;
                 }
             }
             Utils.Plane = Plane;
-        })(Utils || (Utils = {
+        })(Utils2 || (Utils2 = {
         }));
-    })(A || (A = {
+        A.Utils = Utils2;
+    })(A2 || (A2 = {
     }));
+    otherRoot1.A = A2;
 })(otherRoot || (otherRoot = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es2015.2.minified/output.js
index 418dfcc6298..489499ac635 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es2015.2.minified/output.js
@@ -1,23 +1,28 @@
 var Root, otherRoot;
 !function(Root1) {
-    var A, A1, Utils;
-    A1 = A || (A = {
+    var A;
+    let A1, Utils;
+    A = A1 || (A1 = {
     }), (Utils || (Utils = {
     })).mirror = function(p) {
         return {
             x: p.y,
             y: p.x
         };
-    }, A1.Utils = Utils, Root1.A = A;
+    }, A.Utils = Utils, Root1.A = A1;
 }(Root || (Root = {
-})), otherRoot || (otherRoot = {
-}), (A || (A = {
-})).Origin = {
-    x: 0,
-    y: 0
-}, (Utils || (Utils = {
-})).Plane = class {
-    constructor(tl, br){
-        this.tl = tl, this.br = br;
-    }
-};
+})), (function(otherRoot1) {
+    var A;
+    let A2, Utils;
+    (A = A2 || (A2 = {
+    })).Origin = {
+        x: 0,
+        y: 0
+    }, (Utils || (Utils = {
+    })).Plane = class {
+        constructor(tl, br){
+            this.tl = tl, this.br = br;
+        }
+    }, A.Utils = Utils, otherRoot1.A = A2;
+})(otherRoot || (otherRoot = {
+}));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es5.1.normal/output.js
index eadd33c8ce1..9099d16a2b0 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es5.1.normal/output.js
@@ -27,12 +27,14 @@ var Root;
 }));
 //@filename: part2.ts
 var otherRoot;
-(function(otherRoot) {
+(function(otherRoot1) {
+    var A2;
     (function(A) {
         A.Origin = {
             x: 0,
             y: 0
         };
+        var Utils2;
         (function(Utils) {
             var Plane = function Plane(tl, br) {
                 "use strict";
@@ -41,9 +43,11 @@ var otherRoot;
                 this.br = br;
             };
             Utils.Plane = Plane;
-        })(Utils || (Utils = {
+        })(Utils2 || (Utils2 = {
         }));
-    })(A || (A = {
+        A.Utils = Utils2;
+    })(A2 || (A2 = {
     }));
+    otherRoot1.A = A2;
 })(otherRoot || (otherRoot = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es5.2.minified/output.js
index ac2905ca8c5..9fdeaaa48ab 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndDifferentCommonRoot/input.ts/es5.2.minified/output.js
@@ -10,9 +10,9 @@ var Root, otherRoot;
         };
     }, A1.Utils = Utils, Root1.A = A;
 }(Root || (Root = {
-})), (function(otherRoot) {
-    var Utils1, Plane;
-    (A || (A = {
+})), (function(otherRoot1) {
+    var A, A2, Utils, Utils1, Plane;
+    (A2 = A || (A = {
     })).Origin = {
         x: 0,
         y: 0
@@ -22,6 +22,6 @@ var Root, otherRoot;
         (function(instance, Constructor) {
             if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
         })(this, Plane), this.tl = tl, this.br = br;
-    }, Utils1.Plane = Plane;
+    }, Utils1.Plane = Plane, A2.Utils = Utils, otherRoot1.A = A;
 })(otherRoot || (otherRoot = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es2015.1.normal/output.js
index 51e5aef7621..73b0cb67f3b 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 //@filename: part1.ts
 var A;
 (function(A1) {
-    var Utils1;
+    let Utils1;
     (function(Utils) {
         function mirror(p1) {
             return {
@@ -20,6 +20,7 @@ var A;
         x: 0,
         y: 0
     };
+    let Utils2;
     (function(Utils) {
         class Plane {
             constructor(tl, br){
@@ -28,8 +29,9 @@ var A;
             }
         }
         Utils.Plane = Plane;
-    })(Utils || (Utils = {
+    })(Utils2 || (Utils2 = {
     }));
+    A2.Utils = Utils2;
 })(A || (A = {
 }));
 //@filename: part3.ts
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es2015.2.minified/output.js
index 47df1ff4d9e..95afa6f6cd3 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
 !function(A1) {
-    var Utils;
+    let Utils;
     (Utils || (Utils = {
     })).mirror = function(p) {
         return {
@@ -8,16 +8,20 @@
         };
     }, A1.Utils = Utils;
 }(A || (A = {
-})), (A || (A = {
-})).Origin = {
-    x: 0,
-    y: 0
-}, (Utils || (Utils = {
-})).Plane = class {
-    constructor(tl, br){
-        this.tl = tl, this.br = br;
-    }
-};
+})), (function(A2) {
+    A2.Origin = {
+        x: 0,
+        y: 0
+    };
+    let Utils;
+    (Utils || (Utils = {
+    })).Plane = class {
+        constructor(tl, br){
+            this.tl = tl, this.br = br;
+        }
+    }, A2.Utils = Utils;
+})(A || (A = {
+}));
 var A, o, o, o = A.Origin, o = A.Utils.mirror(o);
 new A.Utils.Plane(o, {
     x: 1,
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es5.1.normal/output.js
index 7f8e0b6971c..1d320a1da14 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es5.1.normal/output.js
@@ -25,6 +25,7 @@ var A;
         x: 0,
         y: 0
     };
+    var Utils2;
     (function(Utils) {
         var Plane = function Plane(tl, br) {
             "use strict";
@@ -33,8 +34,9 @@ var A;
             this.br = br;
         };
         Utils.Plane = Plane;
-    })(Utils || (Utils = {
+    })(Utils2 || (Utils2 = {
     }));
+    A2.Utils = Utils2;
 })(A || (A = {
 }));
 //@filename: part3.ts
diff --git a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es5.2.minified/output.js
index 91dbe1731b5..89ca0f8945e 100644
--- a/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/DeclarationMerging/TwoInternalModulesWithTheSameNameAndSameCommonRoot/input.ts/es5.2.minified/output.js
@@ -9,7 +9,7 @@
     }, A1.Utils = Utils;
 }(A || (A = {
 })), (function(A2) {
-    var Utils1, Plane;
+    var Utils, Utils1, Plane;
     A2.Origin = {
         x: 0,
         y: 0
@@ -19,7 +19,7 @@
         (function(instance, Constructor) {
             if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
         })(this, Plane), this.tl = tl, this.br = br;
-    }, Utils1.Plane = Plane;
+    }, Utils1.Plane = Plane, A2.Utils = Utils;
 })(A || (A = {
 }));
 var A, o, o, o = A.Origin, o = A.Utils.mirror(o);
diff --git a/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es2015.1.normal/output.js
index f0fa859142d..7c77987ecce 100644
--- a/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es2015.1.normal/output.js
@@ -17,6 +17,8 @@ var B;
     }
 })(B || (B = {
 }));
+// not copied, since not exported
+var C;
 (function(C) {
     function no() {
         return false;
@@ -35,29 +37,30 @@ var D;
 // validate all exportable statements
 var E;
 (function(E1) {
-    var Color1;
+    let Color;
     (function(Color) {
         Color[Color["Red"] = 0] = "Red";
-    })(Color1 || (Color1 = {
+    })(Color || (Color = {
     }));
     function fn() {
     }
     E1.fn = fn;
-    class C {
+    class C1 {
     }
-    E1.C = C;
-    var M1;
+    E1.C = C1;
+    let M1;
     (function(M) {
         M.x = 42;
     })(M1 || (M1 = {
     }));
-    E1.Color = Color1, E1.M = M1;
+    E1.Color = Color, E1.M = M1;
 })(E || (E = {
 }));
 // validate all exportable statements,
 // which are not exported
 var F;
 (function(F) {
+    let Color;
     (function(Color) {
         Color[Color["Red"] = 0] = "Red";
     })(Color || (Color = {
@@ -66,6 +69,7 @@ var F;
     }
     class C {
     }
+    let M;
     (function(M) {
         var x = 42;
     })(M || (M = {
diff --git a/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es2015.2.minified/output.js
index 5be6b6c7da6..c7716f1fcce 100644
--- a/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es2015.2.minified/output.js
@@ -4,16 +4,20 @@ var A, D, E, F;
 })).yes = function() {
     return !0;
 }, (function(E1) {
-    var Color, M, Color1;
-    (Color1 = Color || (Color = {
-    }))[Color1.Red = 0] = "Red", E1.fn = function() {
+    var Color;
+    let Color;
+    (Color = Color || (Color = {
+    }))[Color.Red = 0] = "Red", E1.fn = function() {
     }, E1.C = class {
-    }, (M || (M = {
+    };
+    let M;
+    (M || (M = {
     })).x = 42, E1.Color = Color, E1.M = M;
 })(E || (E = {
 })), (function(F) {
-    var Color2;
-    (Color2 = Color || (Color = {
-    }))[Color2.Red = 0] = "Red";
+    var Color;
+    let Color;
+    (Color = Color || (Color = {
+    }))[Color.Red = 0] = "Red";
 })(F || (F = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es5.1.normal/output.js
index bf42fa4c9fb..990833b4f67 100644
--- a/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es5.1.normal/output.js
@@ -22,6 +22,8 @@ var B;
     var x = 12;
 })(B || (B = {
 }));
+// not copied, since not exported
+var C;
 (function(C) {
     var no = function no() {
         return false;
@@ -42,23 +44,23 @@ var E;
 (function(E1) {
     var fn = function fn() {
     };
-    var Color1;
+    var Color;
     (function(Color) {
         Color[Color["Red"] = 0] = "Red";
-    })(Color1 || (Color1 = {
+    })(Color || (Color = {
     }));
     E1.fn = fn;
-    var C = function C() {
+    var C1 = function C1() {
         "use strict";
-        _classCallCheck(this, C);
+        _classCallCheck(this, C1);
     };
-    E1.C = C;
+    E1.C = C1;
     var M1;
     (function(M) {
         M.x = 42;
     })(M1 || (M1 = {
     }));
-    E1.Color = Color1, E1.M = M1;
+    E1.Color = Color, E1.M = M1;
 })(E || (E = {
 }));
 // validate all exportable statements,
@@ -67,14 +69,16 @@ var F;
 (function(F) {
     var fn = function fn() {
     };
+    var Color;
     (function(Color) {
         Color[Color["Red"] = 0] = "Red";
     })(Color || (Color = {
     }));
-    var C = function C() {
+    var C2 = function C2() {
         "use strict";
-        _classCallCheck(this, C);
+        _classCallCheck(this, C2);
     };
+    var M;
     (function(M) {
         var x = 42;
     })(M || (M = {
diff --git a/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es5.2.minified/output.js
index c8453b23eb6..5c69700ab10 100644
--- a/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/codeGeneration/exportCodeGen/input.ts/es5.2.minified/output.js
@@ -7,10 +7,10 @@ function _classCallCheck(instance, Constructor) {
 })).yes = function() {
     return !0;
 }, (function(E1) {
-    (Color1 = Color || (Color = {
-    }))[Color1.Red = 0] = "Red", E1.fn = function() {
+    (Color = Color || (Color = {
+    }))[Color.Red = 0] = "Red", E1.fn = function() {
     };
-    var Color, M, Color1, C = function() {
+    var Color, M, Color, C = function() {
         "use strict";
         _classCallCheck(this, C);
     };
@@ -18,9 +18,9 @@ function _classCallCheck(instance, Constructor) {
     })).x = 42, E1.Color = Color, E1.M = M;
 })(E || (E = {
 })), (function(F) {
-    var Color2;
-    (Color2 = Color || (Color = {
-    }))[Color2.Red = 0] = "Red";
+    var Color, Color;
+    (Color = Color || (Color = {
+    }))[Color.Red = 0] = "Red";
     var C = function() {
         "use strict";
         _classCallCheck(this, C);
diff --git a/crates/swc/tests/tsc-references/internalModules/codeGeneration/importStatements/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/codeGeneration/importStatements/input.ts/es2015.1.normal/output.js
index 0b3b1fe1f5b..254a64177e4 100644
--- a/crates/swc/tests/tsc-references/internalModules/codeGeneration/importStatements/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/codeGeneration/importStatements/input.ts/es2015.1.normal/output.js
@@ -11,15 +11,8 @@ var A;
 })(A || (A = {
 }));
 // no code gen expected
-var B;
-(function(B) {
-    var a = A;
-})(B || (B = {
-}));
-// no code gen expected
 var C;
 (function(C) {
-    var a = A;
     var m;
     var p;
     var p = {
diff --git a/crates/swc/tests/tsc-references/internalModules/codeGeneration/importStatements/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/codeGeneration/importStatements/input.ts/es5.1.normal/output.js
index c06049323ec..a57abe1e897 100644
--- a/crates/swc/tests/tsc-references/internalModules/codeGeneration/importStatements/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/codeGeneration/importStatements/input.ts/es5.1.normal/output.js
@@ -16,15 +16,8 @@ var A;
 })(A || (A = {
 }));
 // no code gen expected
-var B;
-(function(B) {
-    var a = A;
-})(B || (B = {
-}));
-// no code gen expected
 var C;
 (function(C) {
-    var a = A;
     var m;
     var p;
     var p = {
diff --git a/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es2015.1.normal/output.js
index 70a5f8fd540..67da3d6bdc7 100644
--- a/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es2015.1.normal/output.js
@@ -6,6 +6,7 @@ var A;
     var _A = '';
 })(A || (A = {
 }));
+var B;
 (function(B) {
     var A = 12;
 })(B || (B = {
@@ -20,10 +21,10 @@ var A;
 var X;
 (function(X2) {
     var X1 = 13;
-    var Y2;
+    let Y2;
     (function(Y) {
         var Y1 = 13;
-        var Z;
+        let Z;
         (function(Z) {
             var X = 12;
             var Y = 12;
diff --git a/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es2015.2.minified/output.js
index 5e78a5d0aac..940c26a6cee 100644
--- a/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
 var X, D;
 !function(X1) {
-    var Y, Z;
+    let Y, Z;
     (Y || (Y = {
     })).Z = Z, X1.Y = Y;
 }(X || (X = {
diff --git a/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es5.1.normal/output.js
index b19b7060bde..57740673e21 100644
--- a/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es5.1.normal/output.js
@@ -11,6 +11,7 @@ var A;
     var _A = '';
 })(A || (A = {
 }));
+var B;
 (function(B) {
     var A = 12;
 })(B || (B = {
diff --git a/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es5.2.minified/output.js
index b31ee32adea..08f319e0d4b 100644
--- a/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/codeGeneration/nameCollision/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var X, D;
+var B, X, D;
 !function(B) {
     var B1 = function() {
         "use strict";
diff --git a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ExportModuleWithAccessibleTypesOnItsExportedMembers/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ExportModuleWithAccessibleTypesOnItsExportedMembers/input.ts/es2015.1.normal/output.js
index ef72952919c..bd55923694a 100644
--- a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ExportModuleWithAccessibleTypesOnItsExportedMembers/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ExportModuleWithAccessibleTypesOnItsExportedMembers/input.ts/es2015.1.normal/output.js
@@ -7,7 +7,7 @@ var A;
         }
     }
     A1.Point = Point;
-    var B1;
+    let B1;
     (function(B) {
         B.Origin = new Point(0, 0);
         class Line {
diff --git a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ExportModuleWithAccessibleTypesOnItsExportedMembers/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ExportModuleWithAccessibleTypesOnItsExportedMembers/input.ts/es2015.2.minified/output.js
index 82f6b6b1d7b..7e4145ba31d 100644
--- a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ExportModuleWithAccessibleTypesOnItsExportedMembers/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ExportModuleWithAccessibleTypesOnItsExportedMembers/input.ts/es2015.2.minified/output.js
@@ -1,12 +1,13 @@
 var A;
 !function(A1) {
-    var B1;
     class Point {
         constructor(x, y){
             this.x = x, this.y = y;
         }
     }
-    A1.Point = Point, (function(B) {
+    A1.Point = Point;
+    let B1;
+    !function(B) {
         B.Origin = new Point(0, 0);
         class Line {
             static fromOrigin(p) {
@@ -19,7 +20,7 @@ var A;
             }
         }
         B.Line = Line;
-    })(B1 || (B1 = {
+    }(B1 || (B1 = {
     })), A1.B = B1;
 }(A || (A = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es2015.1.normal/output.js
index 48996e9527a..0454ae4851e 100644
--- a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es2015.1.normal/output.js
@@ -1,10 +1,11 @@
-(function(A) {
+var A;
+(function(A3) {
     class A1 {
     }
-    A.A = A1;
+    A3.A = A1;
     class AG1 {
     }
-    A.AG = AG1;
+    A3.AG = AG1;
     class A2 {
     }
     class AG2 {
diff --git a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es2015.2.minified/output.js
index c0c1ba92151..f39f27b66e3 100644
--- a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-var A1;
-(A1 = A || (A = {
+var A, A1;
+(A = A1 || (A1 = {
 })).A = class {
-}, A1.AG = class {
-}, new A.A(), new A.AG(), new A.A2(), new A.A2();
+}, A.AG = class {
+}, new A1.A(), new A1.AG(), new A1.A2(), new A1.A2();
diff --git a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es5.1.normal/output.js
index 43b7b9ef0db..858965a43d7 100644
--- a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es5.1.normal/output.js
@@ -3,17 +3,18 @@ function _classCallCheck(instance, Constructor) {
         throw new TypeError("Cannot call a class as a function");
     }
 }
-(function(A) {
+var A;
+(function(A3) {
     var A1 = function A1() {
         "use strict";
         _classCallCheck(this, A1);
     };
-    A.A = A1;
+    A3.A = A1;
     var AG1 = function AG1() {
         "use strict";
         _classCallCheck(this, AG1);
     };
-    A.AG = AG1;
+    A3.AG = AG1;
     var A2 = function A2() {
         "use strict";
         _classCallCheck(this, A2);
diff --git a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es5.2.minified/output.js
index eec059481cc..c8d8b205c7c 100644
--- a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedClasses/input.ts/es5.2.minified/output.js
@@ -1,17 +1,18 @@
+var A;
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-(function(A) {
+(function(A3) {
     var A1 = function() {
         "use strict";
         _classCallCheck(this, A1);
     };
-    A.A = A1;
+    A3.A = A1;
     var AG = function() {
         "use strict";
         _classCallCheck(this, AG);
     };
-    A.AG = AG;
+    A3.AG = AG;
     var A2 = function() {
         "use strict";
         _classCallCheck(this, A2);
diff --git a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es2015.1.normal/output.js
index 01922982e39..ff6c584a90f 100644
--- a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es2015.1.normal/output.js
@@ -1,18 +1,18 @@
 var A;
 (function(A1) {
-    var Color1;
+    let Color;
     (function(Color) {
         Color[Color["Red"] = 0] = "Red";
         Color[Color["Blue"] = 1] = "Blue";
-    })(Color1 || (Color1 = {
+    })(Color || (Color = {
     }));
-    var Day1;
+    let Day;
     (function(Day) {
         Day[Day["Monday"] = 0] = "Monday";
         Day[Day["Tuesday"] = 1] = "Tuesday";
-    })(Day1 || (Day1 = {
+    })(Day || (Day = {
     }));
-    A1.Color = Color1;
+    A1.Color = Color;
 })(A || (A = {
 }));
 // not an error since exported
diff --git a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es2015.2.minified/output.js
index 755124a0ee4..3f736461c15 100644
--- a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,11 @@
 var A;
 (function(A1) {
-    var Color, Day, Color1, Day1;
-    (Color1 = Color || (Color = {
-    }))[Color1.Red = 0] = "Red", Color1[Color1.Blue = 1] = "Blue", (Day1 = Day || (Day = {
-    }))[Day1.Monday = 0] = "Monday", Day1[Day1.Tuesday = 1] = "Tuesday", A1.Color = Color;
+    var Color, Day;
+    let Color;
+    (Color = Color || (Color = {
+    }))[Color.Red = 0] = "Red", Color[Color.Blue = 1] = "Blue";
+    let Day;
+    (Day = Day || (Day = {
+    }))[Day.Monday = 0] = "Monday", Day[Day.Tuesday = 1] = "Tuesday", A1.Color = Color;
 })(A || (A = {
 })), A.Color.Red, A.Day.Monday;
diff --git a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es5.1.normal/output.js
index 01922982e39..7ca82116c6d 100644
--- a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es5.1.normal/output.js
@@ -1,18 +1,18 @@
 var A;
 (function(A1) {
-    var Color1;
+    var Color;
     (function(Color) {
         Color[Color["Red"] = 0] = "Red";
         Color[Color["Blue"] = 1] = "Blue";
-    })(Color1 || (Color1 = {
+    })(Color || (Color = {
     }));
-    var Day1;
+    var Day;
     (function(Day) {
         Day[Day["Monday"] = 0] = "Monday";
         Day[Day["Tuesday"] = 1] = "Tuesday";
-    })(Day1 || (Day1 = {
+    })(Day || (Day = {
     }));
-    A1.Color = Color1;
+    A1.Color = Color;
 })(A || (A = {
 }));
 // not an error since exported
diff --git a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es5.2.minified/output.js
index 755124a0ee4..260f37c52b0 100644
--- a/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/exportDeclarations/ModuleWithExportedAndNonExportedEnums/input.ts/es5.2.minified/output.js
@@ -1,8 +1,8 @@
 var A;
 (function(A1) {
-    var Color, Day, Color1, Day1;
-    (Color1 = Color || (Color = {
-    }))[Color1.Red = 0] = "Red", Color1[Color1.Blue = 1] = "Blue", (Day1 = Day || (Day = {
-    }))[Day1.Monday = 0] = "Monday", Day1[Day1.Tuesday = 1] = "Tuesday", A1.Color = Color;
+    var Color, Day, Color, Day;
+    (Color = Color || (Color = {
+    }))[Color.Red = 0] = "Red", Color[Color.Blue = 1] = "Blue", (Day = Day || (Day = {
+    }))[Day.Monday = 0] = "Monday", Day[Day.Tuesday = 1] = "Tuesday", A1.Color = Color;
 })(A || (A = {
 })), A.Color.Red, A.Day.Monday;
diff --git a/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es2015.1.normal/output.js
index 105de3fdb19..74aca4469bf 100644
--- a/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es2015.1.normal/output.js
@@ -3,9 +3,9 @@ var V = 12;
 class C {
 }
 var E;
-(function(E1) {
-    E1[E1["Red"] = 0] = "Red";
-    E1[E1["Blue"] = 1] = "Blue";
+(function(E) {
+    E[E["Red"] = 0] = "Red";
+    E[E["Blue"] = 1] = "Blue";
 })(E || (E = {
 }));
 export { };
diff --git a/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es2015.2.minified/output.js
index 5b80ab0d0e8..07396d54f21 100644
--- a/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.Red = 0] = "Red", E1[E1.Blue = 1] = "Blue";
+var E, E;
+(E = E || (E = {
+}))[E.Red = 0] = "Red", E[E.Blue = 1] = "Blue";
 export { };
diff --git a/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es5.1.normal/output.js
index dab4a116589..4655b26e229 100644
--- a/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es5.1.normal/output.js
@@ -10,9 +10,9 @@ var C = function C() {
     _classCallCheck(this, C);
 };
 var E;
-(function(E1) {
-    E1[E1["Red"] = 0] = "Red";
-    E1[E1["Blue"] = 1] = "Blue";
+(function(E) {
+    E[E["Red"] = 0] = "Red";
+    E[E["Blue"] = 1] = "Blue";
 })(E || (E = {
 }));
 export { };
diff --git a/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es5.2.minified/output.js
index 5539f5ff8a4..3e252890ed2 100644
--- a/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/importDeclarations/invalidImportAliasIdentifiers/input.ts/es5.2.minified/output.js
@@ -1,9 +1,9 @@
-var E, E1, C = function() {
+var E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-(E1 = E || (E = {
-}))[E1.Red = 0] = "Red", E1[E1.Blue = 1] = "Blue";
+(E = E || (E = {
+}))[E.Red = 0] = "Red", E[E.Blue = 1] = "Blue";
 export { };
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es2015.1.normal/output.js
index c5643515860..8a1d3c41cf9 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es2015.1.normal/output.js
@@ -1,3 +1,4 @@
+var A;
 (function(A) {
     class A1 {
     }
@@ -7,17 +8,17 @@
     }
     class BB extends A1 {
     }
-    var Module;
+    let Module;
     (function(Module) {
         class A {
         }
     })(Module || (Module = {
     }));
-    var Color1;
+    let Color;
     (function(Color) {
         Color[Color["Blue"] = 0] = "Blue";
         Color[Color["Red"] = 1] = "Red";
-    })(Color1 || (Color1 = {
+    })(Color || (Color = {
     }));
     var x = 12;
     function F(s) {
@@ -36,23 +37,25 @@
 }));
 var Y;
 (function(Y1) {
-    class A {
+    class A2 {
     }
-    Y1.A = A;
+    Y1.A = A2;
     class AA {
     }
     Y1.AA = AA;
     class B extends AA {
     }
     Y1.B = B;
-    class BB extends A {
+    class BB extends A2 {
     }
     Y1.BB = BB;
+    let Module;
     (function(Module) {
         class A {
         }
     })(Module || (Module = {
     }));
+    let Color;
     (function(Color) {
         Color[Color["Blue"] = 0] = "Blue";
         Color[Color["Red"] = 1] = "Red";
@@ -72,5 +75,6 @@ var Y;
         id: 2,
         isvalid: true
     };
+    Y1.Module = Module, Y1.Color = Color;
 })(Y || (Y = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es2015.2.minified/output.js
index c5f347eeeea..1bc68982b3b 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es2015.2.minified/output.js
@@ -1,26 +1,29 @@
-var Y;
+var A, Y;
 !function(A) {
-    var Color, Color1;
-    (Color = Color1 || (Color1 = {
+    var Color;
+    let Color;
+    (Color = Color || (Color = {
     }))[Color.Blue = 0] = "Blue", Color[Color.Red = 1] = "Red";
 }(A || (A = {
 })), (function(Y1) {
-    var Color2;
-    class A {
+    var Color;
+    class A1 {
     }
-    Y1.A = A;
+    Y1.A = A1;
     class AA {
     }
     Y1.AA = AA, Y1.B = class extends AA {
-    }, Y1.BB = class extends A {
-    }, (Color2 = Color || (Color = {
-    }))[Color2.Blue = 0] = "Blue", Color2[Color2.Red = 1] = "Red", Y1.x = 12, Y1.F = function(s) {
+    }, Y1.BB = class extends A1 {
+    };
+    let Module, Color;
+    (Color = Color || (Color = {
+    }))[Color.Blue = 0] = "Blue", Color[Color.Red = 1] = "Red", Y1.x = 12, Y1.F = function(s) {
         return 2;
     }, Y1.array = null, Y1.fn = (s)=>"hello " + s
     , Y1.ol = {
         s: "hello",
         id: 2,
         isvalid: !0
-    };
+    }, Y1.Module = Module, Y1.Color = Color;
 })(Y || (Y = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es5.1.normal/output.js
index fa137d6e344..b01dd9606d3 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es5.1.normal/output.js
@@ -69,6 +69,7 @@ function _createSuper(Derived) {
         return _possibleConstructorReturn(this, result);
     };
 }
+var A;
 (function(A2) {
     var F = function F(s) {
         return 2;
@@ -91,9 +92,9 @@ function _createSuper(Derived) {
         }
         return B;
     }(AA);
-    var BB = /*#__PURE__*/ function(A) {
+    var BB = /*#__PURE__*/ function(A3) {
         "use strict";
-        _inherits(BB, A);
+        _inherits(BB, A3);
         var _super = _createSuper(BB);
         function BB() {
             _classCallCheck(this, BB);
@@ -103,17 +104,17 @@ function _createSuper(Derived) {
     }(A1);
     var Module;
     (function(Module) {
-        var A = function A() {
+        var A4 = function A4() {
             "use strict";
-            _classCallCheck(this, A);
+            _classCallCheck(this, A4);
         };
     })(Module || (Module = {
     }));
-    var Color1;
+    var Color;
     (function(Color) {
         Color[Color["Blue"] = 0] = "Blue";
         Color[Color["Red"] = 1] = "Red";
-    })(Color1 || (Color1 = {
+    })(Color || (Color = {
     }));
     var x = 12;
     var array = null;
@@ -132,11 +133,11 @@ var Y;
     var F = function F(s) {
         return 2;
     };
-    var A = function A() {
+    var A5 = function A5() {
         "use strict";
-        _classCallCheck(this, A);
+        _classCallCheck(this, A5);
     };
-    Y1.A = A;
+    Y1.A = A5;
     var AA = function AA() {
         "use strict";
         _classCallCheck(this, AA);
@@ -153,24 +154,26 @@ var Y;
         return B;
     }(AA);
     Y1.B = B;
-    var BB = /*#__PURE__*/ function(A) {
+    var BB = /*#__PURE__*/ function(A6) {
         "use strict";
-        _inherits(BB, A);
+        _inherits(BB, A6);
         var _super = _createSuper(BB);
         function BB() {
             _classCallCheck(this, BB);
             return _super.apply(this, arguments);
         }
         return BB;
-    }(A);
+    }(A5);
     Y1.BB = BB;
+    var Module;
     (function(Module) {
-        var A = function A() {
+        var A7 = function A7() {
             "use strict";
-            _classCallCheck(this, A);
+            _classCallCheck(this, A7);
         };
     })(Module || (Module = {
     }));
+    var Color;
     (function(Color) {
         Color[Color["Blue"] = 0] = "Blue";
         Color[Color["Red"] = 1] = "Red";
@@ -187,5 +190,6 @@ var Y;
         id: 2,
         isvalid: true
     };
+    Y1.Module = Module, Y1.Color = Color;
 })(Y || (Y = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es5.2.minified/output.js
index 28c108722dd..f2cdaf02366 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleBody/moduleWithStatementsOfEveryKind/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var Y;
+var A, Y;
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
@@ -47,7 +47,7 @@ function _createSuper(Derived) {
     };
 }
 !function(A3) {
-    var Module, Color, A1, Color1, A2 = function() {
+    var Module, Color, A1, Color, A2 = function() {
         "use strict";
         _classCallCheck(this, A2);
     }, AA1 = function() {
@@ -61,9 +61,9 @@ function _createSuper(Derived) {
             return _classCallCheck(this, B), _super.apply(this, arguments);
         }
         return B;
-    }(AA1), BB = function(A) {
+    }(AA1), BB = function(A4) {
         "use strict";
-        _inherits(BB, A);
+        _inherits(BB, A4);
         var _super = _createSuper(BB);
         function BB() {
             return _classCallCheck(this, BB), _super.apply(this, arguments);
@@ -74,15 +74,15 @@ function _createSuper(Derived) {
     }), A1 = function() {
         "use strict";
         _classCallCheck(this, A1);
-    }, (Color1 = Color || (Color = {
-    }))[Color1.Blue = 0] = "Blue", Color1[Color1.Red = 1] = "Red";
+    }, (Color = Color || (Color = {
+    }))[Color.Blue = 0] = "Blue", Color[Color.Red = 1] = "Red";
 }(A || (A = {
 })), (function(Y1) {
-    var A5 = function() {
+    var Module, Color, A6 = function() {
         "use strict";
-        _classCallCheck(this, A5);
+        _classCallCheck(this, A6);
     };
-    Y1.A = A5;
+    Y1.A = A6;
     var AA2 = function() {
         "use strict";
         _classCallCheck(this, AA2);
@@ -98,21 +98,21 @@ function _createSuper(Derived) {
         return B;
     }(AA2);
     Y1.B = B;
-    var A4, Color2, BB = function(A) {
+    var A5, Color, BB = function(A7) {
         "use strict";
-        _inherits(BB, A);
+        _inherits(BB, A7);
         var _super = _createSuper(BB);
         function BB() {
             return _classCallCheck(this, BB), _super.apply(this, arguments);
         }
         return BB;
-    }(A5);
+    }(A6);
     Y1.BB = BB, Module || (Module = {
-    }), A4 = function() {
+    }), A5 = function() {
         "use strict";
-        _classCallCheck(this, A4);
-    }, (Color2 = Color || (Color = {
-    }))[Color2.Blue = 0] = "Blue", Color2[Color2.Red = 1] = "Red", Y1.x = 12, Y1.F = function(s) {
+        _classCallCheck(this, A5);
+    }, (Color = Color || (Color = {
+    }))[Color.Blue = 0] = "Blue", Color[Color.Red = 1] = "Red", Y1.x = 12, Y1.F = function(s) {
         return 2;
     }, Y1.array = null, Y1.fn = function(s) {
         return "hello " + s;
@@ -120,6 +120,6 @@ function _createSuper(Derived) {
         s: "hello",
         id: 2,
         isvalid: !0
-    };
+    }, Y1.Module = Module, Y1.Color = Color;
 })(Y || (Y = {
 }));
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es2015.1.normal/output.js
index ac632653d50..d11b77ff5ba 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es2015.1.normal/output.js
@@ -40,13 +40,13 @@ var p2 = new m2.Point();
 var p2 = new M2.Point();
 var M3;
 (function(M31) {
-    var Color1;
+    let Color;
     (function(Color) {
         Color[Color["Blue"] = 0] = "Blue";
         Color[Color["Red"] = 1] = "Red";
-    })(Color1 || (Color1 = {
+    })(Color || (Color = {
     }));
-    M31.Color = Color1;
+    M31.Color = Color;
 })(M3 || (M3 = {
 }));
 var m3;
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es2015.2.minified/output.js
index 817864941de..bd906ad4324 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es2015.2.minified/output.js
@@ -12,9 +12,10 @@ m.Point, (M2 || (M2 = {
 };
 var m2 = M2, a2 = m2.Point, a2 = M2.Point;
 a2.Origin(), new m2.Point(), new M2.Point(), (function(M31) {
-    var Color, Color1;
-    (Color1 = Color || (Color = {
-    }))[Color1.Blue = 0] = "Blue", Color1[Color1.Red = 1] = "Red", M31.Color = Color;
+    var Color;
+    let Color;
+    (Color = Color || (Color = {
+    }))[Color.Blue = 0] = "Blue", Color[Color.Red = 1] = "Red", M31.Color = Color;
 })(M3 || (M3 = {
 }));
 var m3 = M3, a3 = m3.Color, a3 = M3.Color;
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es5.1.normal/output.js
index 4af9d6ae80a..1f8ecac7cc8 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es5.1.normal/output.js
@@ -69,13 +69,13 @@ var p2 = new m2.Point();
 var p2 = new M2.Point();
 var M3;
 (function(M31) {
-    var Color1;
+    var Color;
     (function(Color) {
         Color[Color["Blue"] = 0] = "Blue";
         Color[Color["Red"] = 1] = "Red";
-    })(Color1 || (Color1 = {
+    })(Color || (Color = {
     }));
-    M31.Color = Color1;
+    M31.Color = Color;
 })(M3 || (M3 = {
 }));
 var m3;
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es5.2.minified/output.js
index 731ccfa9bb2..94ca223c3e8 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/instantiatedModule/input.ts/es5.2.minified/output.js
@@ -32,9 +32,9 @@ m.Point, (function(M21) {
 }));
 var m2 = M2, a2 = m2.Point, a2 = M2.Point;
 a2.Origin(), new m2.Point(), new M2.Point(), (function(M31) {
-    var Color, Color1;
-    (Color1 = Color || (Color = {
-    }))[Color1.Blue = 0] = "Blue", Color1[Color1.Red = 1] = "Red", M31.Color = Color;
+    var Color, Color;
+    (Color = Color || (Color = {
+    }))[Color.Blue = 0] = "Blue", Color[Color.Red = 1] = "Red", M31.Color = Color;
 })(M3 || (M3 = {
 }));
 var m3 = M3, a3 = m3.Color, a3 = M3.Color;
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/invalidNestedModules/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/invalidNestedModules/input.ts/es2015.1.normal/output.js
index 9288aa84fe8..c261712afff 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/invalidNestedModules/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/invalidNestedModules/input.ts/es2015.1.normal/output.js
@@ -1,6 +1,6 @@
 var A;
 (function(A1) {
-    var B1;
+    let B1;
     (function(B) {
         class C {
         }
@@ -12,7 +12,7 @@ var A;
 }));
 var M2;
 (function(M21) {
-    var X1;
+    let X1;
     (function(X) {
         var Point;
         X.Point = Point;
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/invalidNestedModules/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/invalidNestedModules/input.ts/es2015.2.minified/output.js
index 5bd1605f713..796f06105e0 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/invalidNestedModules/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/invalidNestedModules/input.ts/es2015.2.minified/output.js
@@ -1,12 +1,13 @@
 var A, M2;
 !function(A1) {
-    var B;
+    let B;
     (B || (B = {
     })).C = class {
     }, A1.B = B;
 }(A || (A = {
 })), (function(M21) {
-    var X, Point;
+    var Point;
+    let X;
     (X || (X = {
     })).Point = Point, M21.X = X;
 })(M2 || (M2 = {
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nestedModules/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nestedModules/input.ts/es2015.1.normal/output.js
index 1c735e9a9bc..2545d73af7e 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nestedModules/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nestedModules/input.ts/es2015.1.normal/output.js
@@ -1,6 +1,6 @@
 var A;
 (function(A1) {
-    var B;
+    let B;
     (function(B) {
         var Point = {
             x: 0,
@@ -13,7 +13,7 @@ var A;
 }));
 var M2;
 (function(M21) {
-    var X1;
+    let X1;
     (function(X) {
         var Point;
         X.Point = Point;
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nestedModules/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nestedModules/input.ts/es2015.2.minified/output.js
index dfc89e2167e..a5b2d28a881 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nestedModules/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nestedModules/input.ts/es2015.2.minified/output.js
@@ -1,10 +1,11 @@
 var A, M2;
 !function(A1) {
-    var B;
+    let B;
     A1.B = B;
 }(A || (A = {
 })), (function(M21) {
-    var X, Point;
+    var Point;
+    let X;
     (X || (X = {
     })).Point = Point, M21.X = X;
 })(M2 || (M2 = {
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nonInstantiatedModule/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nonInstantiatedModule/input.ts/es2015.1.normal/output.js
index 846d6b3f783..21c04adfa12 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nonInstantiatedModule/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nonInstantiatedModule/input.ts/es2015.1.normal/output.js
@@ -12,7 +12,7 @@ var a2;
 var a2 = m.a;
 var M2;
 (function(M21) {
-    var Point1;
+    let Point1;
     (function(Point) {
         function Origin() {
             return {
diff --git a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nonInstantiatedModule/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nonInstantiatedModule/input.ts/es2015.2.minified/output.js
index 4aa8f34df90..ec0e7cf18f3 100644
--- a/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nonInstantiatedModule/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/internalModules/moduleDeclarations/nonInstantiatedModule/input.ts/es2015.2.minified/output.js
@@ -2,7 +2,7 @@
 })).a = 1;
 var M, m, M2, M3, m = M;
 m.a, (function(M21) {
-    var Point;
+    let Point;
     (Point || (Point = {
     })).Origin = function() {
         return {
diff --git a/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es2015.1.normal/output.js
index fd42447af82..46e8c38f7fb 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es2015.1.normal/output.js
@@ -5,7 +5,7 @@ var M;
         }
     }
     M1.Foo = Foo;
-    var S1;
+    let S1;
     (function(S) {
         class Bar {
         }
@@ -15,9 +15,10 @@ var M;
     M1.S = S1;
 })(M || (M = {
 }));
-(function(M) {
+(function(M2) {
     // Emit M.Foo
     Foo, /*#__PURE__*/ React.createElement(Foo, null);
+    let S;
     (function(S) {
         // Emit M.Foo
         Foo, /*#__PURE__*/ React.createElement(Foo, null);
@@ -25,6 +26,7 @@ var M;
         Bar, /*#__PURE__*/ React.createElement(Bar, null);
     })(S || (S = {
     }));
+    M2.S = S;
 })(M || (M = {
 }));
 (function(M) {
@@ -33,7 +35,7 @@ var M;
 })(M || (M = {
 }));
 (function(M) {
-    var M2 = 100;
+    var M3 = 100;
     // Emit M_1.Foo
     Foo, /*#__PURE__*/ React.createElement(Foo, null);
 })(M || (M = {
diff --git a/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es2015.2.minified/output.js
index 98c7f658dcd..8580422f5ae 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es2015.2.minified/output.js
@@ -1,15 +1,20 @@
 var M;
 !function(M1) {
-    var S;
     M1.Foo = class {
         constructor(){
         }
-    }, (S || (S = {
+    };
+    let S;
+    (S || (S = {
     })).Bar = class {
     }, M1.S = S;
 }(M || (M = {
+})), (function(M2) {
+    React.createElement(Foo, null);
+    let S;
+    S || (S = {
+    }), React.createElement(Foo, null), React.createElement(Bar, null), M2.S = S;
+})(M || (M = {
 })), M || (M = {
-}), React.createElement(Foo, null), S || (S = {
-}), React.createElement(Foo, null), React.createElement(Bar, null), M || (M = {
 }), React.createElement(S.Bar, null), M || (M = {
 }), React.createElement(Foo, null);
diff --git a/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es5.1.normal/output.js b/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es5.1.normal/output.js
index a6fc01ecd7e..3a3020f8372 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es5.1.normal/output.js
@@ -22,9 +22,10 @@ var M;
     M1.S = S1;
 })(M || (M = {
 }));
-(function(M) {
+(function(M2) {
     // Emit M.Foo
     Foo, /*#__PURE__*/ React.createElement(Foo, null);
+    var S;
     (function(S) {
         // Emit M.Foo
         Foo, /*#__PURE__*/ React.createElement(Foo, null);
@@ -32,6 +33,7 @@ var M;
         Bar, /*#__PURE__*/ React.createElement(Bar, null);
     })(S || (S = {
     }));
+    M2.S = S;
 })(M || (M = {
 }));
 (function(M) {
@@ -40,7 +42,7 @@ var M;
 })(M || (M = {
 }));
 (function(M) {
-    var M2 = 100;
+    var M3 = 100;
     // Emit M_1.Foo
     Foo, /*#__PURE__*/ React.createElement(Foo, null);
 })(M || (M = {
diff --git a/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es5.2.minified/output.js b/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es5.2.minified/output.js
index 726ffb9e82f..1bd44c77652 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxEmit3x/input.tsx/es5.2.minified/output.js
@@ -13,8 +13,11 @@ function _classCallCheck(instance, Constructor) {
         _classCallCheck(this, Bar);
     }, S1.Bar = Bar, M1.S = S;
 }(M || (M = {
+})), (function(M2) {
+    var S;
+    React.createElement(Foo, null), S || (S = {
+    }), React.createElement(Foo, null), React.createElement(Bar, null), M2.S = S;
+})(M || (M = {
 })), M || (M = {
-}), React.createElement(Foo, null), S || (S = {
-}), React.createElement(Foo, null), React.createElement(Bar, null), M || (M = {
 }), React.createElement(S.Bar, null), M || (M = {
 }), React.createElement(Foo, null);
diff --git a/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es2015.1.normal/output.js
index 1dcf6e5cf8d..333499b5967 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es2015.1.normal/output.js
@@ -17,9 +17,9 @@ function _extends() {
 // @noLib: true
 // @skipLibCheck: true
 // @libFiles: react.d.ts,lib.d.ts
-const React1 = require('react');
+const React = require('react');
 export function makeP(Ctor) {
-    return class _class extends React1.PureComponent {
+    return class _class extends React.PureComponent {
         render() {
             return(/*#__PURE__*/ React.createElement(Ctor, _extends({
             }, this.props)));
diff --git a/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es2015.2.minified/output.js
index 6286a34f9e2..6333fc60a0d 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es2015.2.minified/output.js
@@ -7,9 +7,9 @@ function _extends() {
         return target;
     }).apply(this, arguments);
 }
-const React1 = require("react");
+const React = require("react");
 export function makeP(Ctor) {
-    return class extends React1.PureComponent {
+    return class extends React.PureComponent {
         render() {
             return React.createElement(Ctor, _extends({
             }, this.props));
diff --git a/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es5.1.normal/output.js b/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es5.1.normal/output.js
index d6653370cd5..9ab762b110b 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es5.1.normal/output.js
@@ -102,7 +102,7 @@ function _createSuper(Derived) {
 // @noLib: true
 // @skipLibCheck: true
 // @libFiles: react.d.ts,lib.d.ts
-var React1 = require('react');
+var React = require('react');
 export function makeP(Ctor) {
     return /*#__PURE__*/ (function(_PureComponent) {
         "use strict";
@@ -122,5 +122,5 @@ export function makeP(Ctor) {
             }
         ]);
         return _class;
-    })(React1.PureComponent);
+    })(React.PureComponent);
 }
diff --git a/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es5.2.minified/output.js b/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es5.2.minified/output.js
index e162b6e1e81..b6a762b55c2 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxGenericAttributesType9x/input.tsx/es5.2.minified/output.js
@@ -23,7 +23,7 @@ function _setPrototypeOf(o, p) {
         return o.__proto__ = p, o;
     }, _setPrototypeOf(o, p);
 }
-var React1 = require("react");
+var React = require("react");
 export function makeP(Ctor) {
     return (function(_PureComponent) {
         "use strict";
@@ -75,5 +75,5 @@ export function makeP(Ctor) {
                 }
             }
         ], _defineProperties(Constructor.prototype, protoProps), staticProps && _defineProperties(Constructor, staticProps), _class;
-    })(React1.PureComponent);
+    })(React.PureComponent);
 }
diff --git a/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es2015.1.normal/output.js
index 86bda07d206..ce2aa925570 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es2015.1.normal/output.js
@@ -1,6 +1,6 @@
 //@Filename: test.tsx
 // Should emit 'react-router' in the AMD dependency list
-const React1 = require('react');
+const React = require('react');
 const ReactRouter = require('react-router');
 var Route = ReactRouter.Route;
 var routes1 = /*#__PURE__*/ React.createElement(Route, null);
diff --git a/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es2015.2.minified/output.js
index a73ffe8a70e..ea62710c6a8 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es2015.2.minified/output.js
@@ -1,5 +1,4 @@
-require("react");
-const ReactRouter = require("react-router");
+const React = require("react"), ReactRouter = require("react-router");
 var M, Route = ReactRouter.Route;
 React.createElement(Route, null), (function(M1) {
     var X;
diff --git a/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es5.1.normal/output.js b/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es5.1.normal/output.js
index 3b917a0668c..11575c44cfb 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es5.1.normal/output.js
@@ -1,6 +1,6 @@
 //@Filename: test.tsx
 // Should emit 'react-router' in the AMD dependency list
-var React1 = require('react');
+var React = require('react');
 var ReactRouter = require('react-router');
 var Route = ReactRouter.Route;
 var routes1 = /*#__PURE__*/ React.createElement(Route, null);
diff --git a/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es5.2.minified/output.js b/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es5.2.minified/output.js
index 88976cfc6c9..2f7dceb3639 100644
--- a/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/jsx/tsxPreserveEmit1x/input.tsx/es5.2.minified/output.js
@@ -1,5 +1,4 @@
-require("react");
-var M, Route = require("react-router").Route;
+var M, React = require("react"), Route = require("react-router").Route;
 React.createElement(Route, null), (function(M1) {
     var X;
     M1.X = X;
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es2015.1.normal/output.js
index 16c60115327..402ed63ac7a 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 export var SignatureFlags;
-(function(SignatureFlags1) {
-    SignatureFlags1[SignatureFlags1["None"] = 0] = "None";
-    SignatureFlags1[SignatureFlags1["IsIndexer"] = 1] = "IsIndexer";
-    SignatureFlags1[SignatureFlags1["IsStringIndexer"] = 2] = "IsStringIndexer";
-    SignatureFlags1[SignatureFlags1["IsNumberIndexer"] = 4] = "IsNumberIndexer";
+(function(SignatureFlags) {
+    SignatureFlags[SignatureFlags["None"] = 0] = "None";
+    SignatureFlags[SignatureFlags["IsIndexer"] = 1] = "IsIndexer";
+    SignatureFlags[SignatureFlags["IsStringIndexer"] = 2] = "IsStringIndexer";
+    SignatureFlags[SignatureFlags["IsNumberIndexer"] = 4] = "IsNumberIndexer";
 })(SignatureFlags || (SignatureFlags = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es2015.2.minified/output.js
index 1b892aa7eee..7fdb7ee7645 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var SignatureFlags, SignatureFlags1;
-(SignatureFlags1 = SignatureFlags || (SignatureFlags = {
-}))[SignatureFlags1.None = 0] = "None", SignatureFlags1[SignatureFlags1.IsIndexer = 1] = "IsIndexer", SignatureFlags1[SignatureFlags1.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags1[SignatureFlags1.IsNumberIndexer = 4] = "IsNumberIndexer";
+var SignatureFlags, SignatureFlags;
+(SignatureFlags = SignatureFlags || (SignatureFlags = {
+}))[SignatureFlags.None = 0] = "None", SignatureFlags[SignatureFlags.IsIndexer = 1] = "IsIndexer", SignatureFlags[SignatureFlags.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags[SignatureFlags.IsNumberIndexer = 4] = "IsNumberIndexer";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es5.1.normal/output.js
index 16c60115327..402ed63ac7a 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 export var SignatureFlags;
-(function(SignatureFlags1) {
-    SignatureFlags1[SignatureFlags1["None"] = 0] = "None";
-    SignatureFlags1[SignatureFlags1["IsIndexer"] = 1] = "IsIndexer";
-    SignatureFlags1[SignatureFlags1["IsStringIndexer"] = 2] = "IsStringIndexer";
-    SignatureFlags1[SignatureFlags1["IsNumberIndexer"] = 4] = "IsNumberIndexer";
+(function(SignatureFlags) {
+    SignatureFlags[SignatureFlags["None"] = 0] = "None";
+    SignatureFlags[SignatureFlags["IsIndexer"] = 1] = "IsIndexer";
+    SignatureFlags[SignatureFlags["IsStringIndexer"] = 2] = "IsStringIndexer";
+    SignatureFlags[SignatureFlags["IsNumberIndexer"] = 4] = "IsNumberIndexer";
 })(SignatureFlags || (SignatureFlags = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es5.2.minified/output.js
index 1b892aa7eee..7fdb7ee7645 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum1/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var SignatureFlags, SignatureFlags1;
-(SignatureFlags1 = SignatureFlags || (SignatureFlags = {
-}))[SignatureFlags1.None = 0] = "None", SignatureFlags1[SignatureFlags1.IsIndexer = 1] = "IsIndexer", SignatureFlags1[SignatureFlags1.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags1[SignatureFlags1.IsNumberIndexer = 4] = "IsNumberIndexer";
+var SignatureFlags, SignatureFlags;
+(SignatureFlags = SignatureFlags || (SignatureFlags = {
+}))[SignatureFlags.None = 0] = "None", SignatureFlags[SignatureFlags.IsIndexer = 1] = "IsIndexer", SignatureFlags[SignatureFlags.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags[SignatureFlags.IsNumberIndexer = 4] = "IsNumberIndexer";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es2015.1.normal/output.js
index 16c60115327..402ed63ac7a 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 export var SignatureFlags;
-(function(SignatureFlags1) {
-    SignatureFlags1[SignatureFlags1["None"] = 0] = "None";
-    SignatureFlags1[SignatureFlags1["IsIndexer"] = 1] = "IsIndexer";
-    SignatureFlags1[SignatureFlags1["IsStringIndexer"] = 2] = "IsStringIndexer";
-    SignatureFlags1[SignatureFlags1["IsNumberIndexer"] = 4] = "IsNumberIndexer";
+(function(SignatureFlags) {
+    SignatureFlags[SignatureFlags["None"] = 0] = "None";
+    SignatureFlags[SignatureFlags["IsIndexer"] = 1] = "IsIndexer";
+    SignatureFlags[SignatureFlags["IsStringIndexer"] = 2] = "IsStringIndexer";
+    SignatureFlags[SignatureFlags["IsNumberIndexer"] = 4] = "IsNumberIndexer";
 })(SignatureFlags || (SignatureFlags = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es2015.2.minified/output.js
index 1b892aa7eee..7fdb7ee7645 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var SignatureFlags, SignatureFlags1;
-(SignatureFlags1 = SignatureFlags || (SignatureFlags = {
-}))[SignatureFlags1.None = 0] = "None", SignatureFlags1[SignatureFlags1.IsIndexer = 1] = "IsIndexer", SignatureFlags1[SignatureFlags1.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags1[SignatureFlags1.IsNumberIndexer = 4] = "IsNumberIndexer";
+var SignatureFlags, SignatureFlags;
+(SignatureFlags = SignatureFlags || (SignatureFlags = {
+}))[SignatureFlags.None = 0] = "None", SignatureFlags[SignatureFlags.IsIndexer = 1] = "IsIndexer", SignatureFlags[SignatureFlags.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags[SignatureFlags.IsNumberIndexer = 4] = "IsNumberIndexer";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es5.1.normal/output.js
index 16c60115327..402ed63ac7a 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 export var SignatureFlags;
-(function(SignatureFlags1) {
-    SignatureFlags1[SignatureFlags1["None"] = 0] = "None";
-    SignatureFlags1[SignatureFlags1["IsIndexer"] = 1] = "IsIndexer";
-    SignatureFlags1[SignatureFlags1["IsStringIndexer"] = 2] = "IsStringIndexer";
-    SignatureFlags1[SignatureFlags1["IsNumberIndexer"] = 4] = "IsNumberIndexer";
+(function(SignatureFlags) {
+    SignatureFlags[SignatureFlags["None"] = 0] = "None";
+    SignatureFlags[SignatureFlags["IsIndexer"] = 1] = "IsIndexer";
+    SignatureFlags[SignatureFlags["IsStringIndexer"] = 2] = "IsStringIndexer";
+    SignatureFlags[SignatureFlags["IsNumberIndexer"] = 4] = "IsNumberIndexer";
 })(SignatureFlags || (SignatureFlags = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es5.2.minified/output.js
index 1b892aa7eee..7fdb7ee7645 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum2/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var SignatureFlags, SignatureFlags1;
-(SignatureFlags1 = SignatureFlags || (SignatureFlags = {
-}))[SignatureFlags1.None = 0] = "None", SignatureFlags1[SignatureFlags1.IsIndexer = 1] = "IsIndexer", SignatureFlags1[SignatureFlags1.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags1[SignatureFlags1.IsNumberIndexer = 4] = "IsNumberIndexer";
+var SignatureFlags, SignatureFlags;
+(SignatureFlags = SignatureFlags || (SignatureFlags = {
+}))[SignatureFlags.None = 0] = "None", SignatureFlags[SignatureFlags.IsIndexer = 1] = "IsIndexer", SignatureFlags[SignatureFlags.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags[SignatureFlags.IsNumberIndexer = 4] = "IsNumberIndexer";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es2015.1.normal/output.js
index 97af782366c..857c3340038 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es2015.2.minified/output.js
index 07aa7d9a2f5..bc1aac8379a 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C";
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es5.1.normal/output.js
index 97af782366c..857c3340038 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es5.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es5.2.minified/output.js
index 07aa7d9a2f5..bc1aac8379a 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnum6/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C";
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es2015.1.normal/output.js
index 580e01d9fd6..59b2ce1ca0a 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es2015.1.normal/output.js
@@ -1,6 +1,6 @@
 var E;
-(function(E1) {
-    E1[E1["Foo"] = 1] = "Foo";
-    E1[E1["Bar"] = 2] = "Bar";
+(function(E) {
+    E[E["Foo"] = 1] = "Foo";
+    E[E["Bar"] = 2] = "Bar";
 })(E || (E = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es2015.2.minified/output.js
index 9f1447846c3..665d2e372e0 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.Foo = 1] = "Foo", E1[E1.Bar = 2] = "Bar";
+var E, E;
+(E = E || (E = {
+}))[E.Foo = 1] = "Foo", E[E.Bar = 2] = "Bar";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es5.1.normal/output.js
index 580e01d9fd6..59b2ce1ca0a 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es5.1.normal/output.js
@@ -1,6 +1,6 @@
 var E;
-(function(E1) {
-    E1[E1["Foo"] = 1] = "Foo";
-    E1[E1["Bar"] = 2] = "Bar";
+(function(E) {
+    E[E["Foo"] = 1] = "Foo";
+    E[E["Bar"] = 2] = "Bar";
 })(E || (E = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es5.2.minified/output.js
index 9f1447846c3..665d2e372e0 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration1/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.Foo = 1] = "Foo", E1[E1.Bar = 2] = "Bar";
+var E, E;
+(E = E || (E = {
+}))[E.Foo = 1] = "Foo", E[E.Bar = 2] = "Bar";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es2015.1.normal/output.js
index c20a0da99a2..ffae698b70b 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es2015.1.normal/output.js
@@ -1,5 +1,5 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 1] = "A";
+(function(E) {
+    E[E["A"] = 1] = "A";
 })(E || (E = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es2015.2.minified/output.js
index abf273d0515..6004f0a16a1 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 1] = "A";
+var E, E;
+(E = E || (E = {
+}))[E.A = 1] = "A";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es5.1.normal/output.js
index c20a0da99a2..ffae698b70b 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es5.1.normal/output.js
@@ -1,5 +1,5 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 1] = "A";
+(function(E) {
+    E[E["A"] = 1] = "A";
 })(E || (E = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es5.2.minified/output.js
index abf273d0515..6004f0a16a1 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration3/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 1] = "A";
+var E, E;
+(E = E || (E = {
+}))[E.A = 1] = "A";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es2015.1.normal/output.js
index f4aeb2b57e1..1891926cb24 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 1] = "A";
-    E1[E1["B"] = 2] = "B";
-    E1[E1["C"] = 2] = "C";
-    E1[E1["D"] = 3] = "D";
+(function(E) {
+    E[E["A"] = 1] = "A";
+    E[E["B"] = 2] = "B";
+    E[E["C"] = 2] = "C";
+    E[E["D"] = 3] = "D";
 })(E || (E = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es2015.2.minified/output.js
index 62d2ea08f84..10cd5d20bdd 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 1] = "A", E1[E1.B = 2] = "B", E1[E1.C = 2] = "C", E1[E1.D = 3] = "D";
+var E, E;
+(E = E || (E = {
+}))[E.A = 1] = "A", E[E.B = 2] = "B", E[E.C = 2] = "C", E[E.D = 3] = "D";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es5.1.normal/output.js
index f4aeb2b57e1..1891926cb24 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 1] = "A";
-    E1[E1["B"] = 2] = "B";
-    E1[E1["C"] = 2] = "C";
-    E1[E1["D"] = 3] = "D";
+(function(E) {
+    E[E["A"] = 1] = "A";
+    E[E["B"] = 2] = "B";
+    E[E["C"] = 2] = "C";
+    E[E["D"] = 3] = "D";
 })(E || (E = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es5.2.minified/output.js
index 62d2ea08f84..10cd5d20bdd 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration5/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 1] = "A", E1[E1.B = 2] = "B", E1[E1.C = 2] = "C", E1[E1.D = 3] = "D";
+var E, E;
+(E = E || (E = {
+}))[E.A = 1] = "A", E[E.B = 2] = "B", E[E.C = 2] = "C", E[E.D = 3] = "D";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es2015.1.normal/output.js
index f4aeb2b57e1..1891926cb24 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 1] = "A";
-    E1[E1["B"] = 2] = "B";
-    E1[E1["C"] = 2] = "C";
-    E1[E1["D"] = 3] = "D";
+(function(E) {
+    E[E["A"] = 1] = "A";
+    E[E["B"] = 2] = "B";
+    E[E["C"] = 2] = "C";
+    E[E["D"] = 3] = "D";
 })(E || (E = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es2015.2.minified/output.js
index 62d2ea08f84..10cd5d20bdd 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 1] = "A", E1[E1.B = 2] = "B", E1[E1.C = 2] = "C", E1[E1.D = 3] = "D";
+var E, E;
+(E = E || (E = {
+}))[E.A = 1] = "A", E[E.B = 2] = "B", E[E.C = 2] = "C", E[E.D = 3] = "D";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es5.1.normal/output.js
index f4aeb2b57e1..1891926cb24 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 1] = "A";
-    E1[E1["B"] = 2] = "B";
-    E1[E1["C"] = 2] = "C";
-    E1[E1["D"] = 3] = "D";
+(function(E) {
+    E[E["A"] = 1] = "A";
+    E[E["B"] = 2] = "B";
+    E[E["C"] = 2] = "C";
+    E[E["D"] = 3] = "D";
 })(E || (E = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es5.2.minified/output.js
index 62d2ea08f84..10cd5d20bdd 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserEnumDeclaration6/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 1] = "A", E1[E1.B = 2] = "B", E1[E1.C = 2] = "C", E1[E1.D = 3] = "D";
+var E, E;
+(E = E || (E = {
+}))[E.A = 1] = "A", E[E.B = 2] = "B", E[E.C = 2] = "C", E[E.D = 3] = "D";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es2015.1.normal/output.js
index bac314f6c94..9b2f1b678c4 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es2015.1.normal/output.js
@@ -1,5 +1,5 @@
 var Bar;
-(function(Bar1) {
-    Bar1[Bar1["interface"] = 0] = "interface";
+(function(Bar) {
+    Bar[Bar["interface"] = 0] = "interface";
 })(Bar || (Bar = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es2015.2.minified/output.js
index e176d2ae7f2..27fde13f748 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var Bar, Bar1;
-(Bar1 = Bar || (Bar = {
-}))[Bar1.interface = 0] = "interface";
+var Bar, Bar;
+(Bar = Bar || (Bar = {
+}))[Bar.interface = 0] = "interface";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es5.1.normal/output.js
index bac314f6c94..9b2f1b678c4 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es5.1.normal/output.js
@@ -1,5 +1,5 @@
 var Bar;
-(function(Bar1) {
-    Bar1[Bar1["interface"] = 0] = "interface";
+(function(Bar) {
+    Bar[Bar["interface"] = 0] = "interface";
 })(Bar || (Bar = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es5.2.minified/output.js
index e176d2ae7f2..27fde13f748 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var Bar, Bar1;
-(Bar1 = Bar || (Bar = {
-}))[Bar1.interface = 0] = "interface";
+var Bar, Bar;
+(Bar = Bar || (Bar = {
+}))[Bar.interface = 0] = "interface";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es2015.1.normal/output.js
index 074ac6f6a08..bd2bebdf439 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es2015.1.normal/output.js
@@ -1,6 +1,6 @@
 "use strict";
 var Bar;
-(function(Bar1) {
-    Bar1[Bar1["interface"] = 0] = "interface";
+(function(Bar) {
+    Bar[Bar["interface"] = 0] = "interface";
 })(Bar || (Bar = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es2015.2.minified/output.js
index 7e550922d47..df32fdf02de 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
 "use strict";
-var Bar, Bar1;
-(Bar1 = Bar || (Bar = {
-}))[Bar1.interface = 0] = "interface";
+var Bar, Bar;
+(Bar = Bar || (Bar = {
+}))[Bar.interface = 0] = "interface";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es5.1.normal/output.js
index 074ac6f6a08..bd2bebdf439 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es5.1.normal/output.js
@@ -1,6 +1,6 @@
 "use strict";
 var Bar;
-(function(Bar1) {
-    Bar1[Bar1["interface"] = 0] = "interface";
+(function(Bar) {
+    Bar[Bar["interface"] = 0] = "interface";
 })(Bar || (Bar = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es5.2.minified/output.js
index 7e550922d47..df32fdf02de 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/EnumDeclarations/parserInterfaceKeywordInEnum1/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
 "use strict";
-var Bar, Bar1;
-(Bar1 = Bar || (Bar = {
-}))[Bar1.interface = 0] = "interface";
+var Bar, Bar;
+(Bar = Bar || (Bar = {
+}))[Bar.interface = 0] = "interface";
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource1/input.ts/es2015.1.normal/output.js
index fe03ac14098..8efa840746d 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource1/input.ts/es2015.1.normal/output.js
@@ -3,7 +3,7 @@
 ///<reference path='typescript.ts' />
 var TypeScript;
 (function(TypeScript1) {
-    var CompilerDiagnostics1;
+    let CompilerDiagnostics1;
     (function(CompilerDiagnostics) {
         CompilerDiagnostics.debug = false;
         CompilerDiagnostics.diagnosticWriter = null;
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource1/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource1/input.ts/es2015.2.minified/output.js
index 167ac36c692..1ddd104860d 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource1/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource1/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
 var TypeScript;
 !function(TypeScript1) {
-    var CompilerDiagnostics1;
+    let CompilerDiagnostics1;
     !function(CompilerDiagnostics) {
         function Alert(output) {
             diagnosticWriter && diagnosticWriter.Alert(output);
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es2015.1.normal/output.js
index 3e537052034..3a20bd9ae13 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es2015.1.normal/output.js
@@ -64,113 +64,113 @@ var TypeScript;
             return new AstWalker(this.childrenWalkers, pre, post, options, state);
         }
         initChildrenWalkers() {
-            this.childrenWalkers[NodeType.None] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.Empty] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.EmptyExpr] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.True] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.False] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.This] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.Super] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.QString] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.Regex] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.Null] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.ArrayLit] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.ObjectLit] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.Void] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.Comma] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Pos] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.Neg] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.Delete] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.Await] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.In] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Dot] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.From] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Is] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.InstOf] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Typeof] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.NumberLit] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.Name] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.TypeRef] = ChildrenWalkers1.walkTypeReferenceChildren;
-            this.childrenWalkers[NodeType.Index] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Call] = ChildrenWalkers1.walkCallExpressionChildren;
-            this.childrenWalkers[NodeType.New] = ChildrenWalkers1.walkCallExpressionChildren;
-            this.childrenWalkers[NodeType.Asg] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgAdd] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgSub] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgDiv] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgMul] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgMod] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgAnd] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgXor] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgOr] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgLsh] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgRsh] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.AsgRs2] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.ConditionalExpression] = ChildrenWalkers1.walkTrinaryExpressionChildren;
-            this.childrenWalkers[NodeType.LogOr] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.LogAnd] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Or] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Xor] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.And] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Eq] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Ne] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Eqv] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.NEqv] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Lt] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Le] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Gt] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Ge] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Add] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Sub] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Mul] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Div] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Mod] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Lsh] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Rsh] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Rs2] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.Not] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.LogNot] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.IncPre] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.DecPre] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.IncPost] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.DecPost] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.TypeAssertion] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.FuncDecl] = ChildrenWalkers1.walkFuncDeclChildren;
-            this.childrenWalkers[NodeType.Member] = ChildrenWalkers1.walkBinaryExpressionChildren;
-            this.childrenWalkers[NodeType.VarDecl] = ChildrenWalkers1.walkBoundDeclChildren;
-            this.childrenWalkers[NodeType.ArgDecl] = ChildrenWalkers1.walkBoundDeclChildren;
-            this.childrenWalkers[NodeType.Return] = ChildrenWalkers1.walkReturnStatementChildren;
-            this.childrenWalkers[NodeType.Break] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.Continue] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.Throw] = ChildrenWalkers1.walkUnaryExpressionChildren;
-            this.childrenWalkers[NodeType.For] = ChildrenWalkers1.walkForStatementChildren;
-            this.childrenWalkers[NodeType.ForIn] = ChildrenWalkers1.walkForInStatementChildren;
-            this.childrenWalkers[NodeType.If] = ChildrenWalkers1.walkIfStatementChildren;
-            this.childrenWalkers[NodeType.While] = ChildrenWalkers1.walkWhileStatementChildren;
-            this.childrenWalkers[NodeType.DoWhile] = ChildrenWalkers1.walkDoWhileStatementChildren;
-            this.childrenWalkers[NodeType.Block] = ChildrenWalkers1.walkBlockChildren;
-            this.childrenWalkers[NodeType.Case] = ChildrenWalkers1.walkCaseStatementChildren;
-            this.childrenWalkers[NodeType.Switch] = ChildrenWalkers1.walkSwitchStatementChildren;
-            this.childrenWalkers[NodeType.Try] = ChildrenWalkers1.walkTryChildren;
-            this.childrenWalkers[NodeType.TryCatch] = ChildrenWalkers1.walkTryCatchChildren;
-            this.childrenWalkers[NodeType.TryFinally] = ChildrenWalkers1.walkTryFinallyChildren;
-            this.childrenWalkers[NodeType.Finally] = ChildrenWalkers1.walkFinallyChildren;
-            this.childrenWalkers[NodeType.Catch] = ChildrenWalkers1.walkCatchChildren;
-            this.childrenWalkers[NodeType.List] = ChildrenWalkers1.walkListChildren;
-            this.childrenWalkers[NodeType.Script] = ChildrenWalkers1.walkScriptChildren;
-            this.childrenWalkers[NodeType.ClassDeclaration] = ChildrenWalkers1.walkClassDeclChildren;
-            this.childrenWalkers[NodeType.InterfaceDeclaration] = ChildrenWalkers1.walkTypeDeclChildren;
-            this.childrenWalkers[NodeType.ModuleDeclaration] = ChildrenWalkers1.walkModuleDeclChildren;
-            this.childrenWalkers[NodeType.ImportDeclaration] = ChildrenWalkers1.walkImportDeclChildren;
-            this.childrenWalkers[NodeType.With] = ChildrenWalkers1.walkWithStatementChildren;
-            this.childrenWalkers[NodeType.Label] = ChildrenWalkers1.walkLabelChildren;
-            this.childrenWalkers[NodeType.LabeledStatement] = ChildrenWalkers1.walkLabeledStatementChildren;
-            this.childrenWalkers[NodeType.EBStart] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.GotoEB] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.EndCode] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.Error] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.Comment] = ChildrenWalkers1.walkNone;
-            this.childrenWalkers[NodeType.Debugger] = ChildrenWalkers1.walkNone;
+            this.childrenWalkers[NodeType.None] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.Empty] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.EmptyExpr] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.True] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.False] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.This] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.Super] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.QString] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.Regex] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.Null] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.ArrayLit] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.ObjectLit] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.Void] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.Comma] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Pos] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.Neg] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.Delete] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.Await] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.In] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Dot] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.From] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Is] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.InstOf] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Typeof] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.NumberLit] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.Name] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.TypeRef] = ChildrenWalkers.walkTypeReferenceChildren;
+            this.childrenWalkers[NodeType.Index] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Call] = ChildrenWalkers.walkCallExpressionChildren;
+            this.childrenWalkers[NodeType.New] = ChildrenWalkers.walkCallExpressionChildren;
+            this.childrenWalkers[NodeType.Asg] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgAdd] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgSub] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgDiv] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgMul] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgMod] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgAnd] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgXor] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgOr] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgLsh] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgRsh] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.AsgRs2] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.ConditionalExpression] = ChildrenWalkers.walkTrinaryExpressionChildren;
+            this.childrenWalkers[NodeType.LogOr] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.LogAnd] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Or] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Xor] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.And] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Eq] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Ne] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Eqv] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.NEqv] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Lt] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Le] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Gt] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Ge] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Add] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Sub] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Mul] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Div] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Mod] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Lsh] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Rsh] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Rs2] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.Not] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.LogNot] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.IncPre] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.DecPre] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.IncPost] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.DecPost] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.TypeAssertion] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.FuncDecl] = ChildrenWalkers.walkFuncDeclChildren;
+            this.childrenWalkers[NodeType.Member] = ChildrenWalkers.walkBinaryExpressionChildren;
+            this.childrenWalkers[NodeType.VarDecl] = ChildrenWalkers.walkBoundDeclChildren;
+            this.childrenWalkers[NodeType.ArgDecl] = ChildrenWalkers.walkBoundDeclChildren;
+            this.childrenWalkers[NodeType.Return] = ChildrenWalkers.walkReturnStatementChildren;
+            this.childrenWalkers[NodeType.Break] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.Continue] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.Throw] = ChildrenWalkers.walkUnaryExpressionChildren;
+            this.childrenWalkers[NodeType.For] = ChildrenWalkers.walkForStatementChildren;
+            this.childrenWalkers[NodeType.ForIn] = ChildrenWalkers.walkForInStatementChildren;
+            this.childrenWalkers[NodeType.If] = ChildrenWalkers.walkIfStatementChildren;
+            this.childrenWalkers[NodeType.While] = ChildrenWalkers.walkWhileStatementChildren;
+            this.childrenWalkers[NodeType.DoWhile] = ChildrenWalkers.walkDoWhileStatementChildren;
+            this.childrenWalkers[NodeType.Block] = ChildrenWalkers.walkBlockChildren;
+            this.childrenWalkers[NodeType.Case] = ChildrenWalkers.walkCaseStatementChildren;
+            this.childrenWalkers[NodeType.Switch] = ChildrenWalkers.walkSwitchStatementChildren;
+            this.childrenWalkers[NodeType.Try] = ChildrenWalkers.walkTryChildren;
+            this.childrenWalkers[NodeType.TryCatch] = ChildrenWalkers.walkTryCatchChildren;
+            this.childrenWalkers[NodeType.TryFinally] = ChildrenWalkers.walkTryFinallyChildren;
+            this.childrenWalkers[NodeType.Finally] = ChildrenWalkers.walkFinallyChildren;
+            this.childrenWalkers[NodeType.Catch] = ChildrenWalkers.walkCatchChildren;
+            this.childrenWalkers[NodeType.List] = ChildrenWalkers.walkListChildren;
+            this.childrenWalkers[NodeType.Script] = ChildrenWalkers.walkScriptChildren;
+            this.childrenWalkers[NodeType.ClassDeclaration] = ChildrenWalkers.walkClassDeclChildren;
+            this.childrenWalkers[NodeType.InterfaceDeclaration] = ChildrenWalkers.walkTypeDeclChildren;
+            this.childrenWalkers[NodeType.ModuleDeclaration] = ChildrenWalkers.walkModuleDeclChildren;
+            this.childrenWalkers[NodeType.ImportDeclaration] = ChildrenWalkers.walkImportDeclChildren;
+            this.childrenWalkers[NodeType.With] = ChildrenWalkers.walkWithStatementChildren;
+            this.childrenWalkers[NodeType.Label] = ChildrenWalkers.walkLabelChildren;
+            this.childrenWalkers[NodeType.LabeledStatement] = ChildrenWalkers.walkLabeledStatementChildren;
+            this.childrenWalkers[NodeType.EBStart] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.GotoEB] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.EndCode] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.Error] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.Comment] = ChildrenWalkers.walkNone;
+            this.childrenWalkers[NodeType.Debugger] = ChildrenWalkers.walkNone;
             // Verify the code is up to date with the enum
             for(var e in NodeType._map){
                 if (this.childrenWalkers[e] === undefined) {
@@ -192,7 +192,7 @@ var TypeScript;
         return globalAstWalkerFactory;
     }
     TypeScript1.getAstWalkerFactory = getAstWalkerFactory;
-    var ChildrenWalkers1;
+    let ChildrenWalkers1;
     (function(ChildrenWalkers) {
         function walkNone(preAst, parent, walker) {
         // Nothing to do
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es2015.2.minified/output.js
index 290ef28f0a7..4f00a397818 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
 var TypeScript;
 !function(TypeScript1) {
-    var globalAstWalkerFactory, ChildrenWalkers1;
+    var globalAstWalkerFactory;
     class AstWalkOptions {
         stopWalk(stop = !0) {
             this.goChildren = !stop, this.goNextSibling = !stop;
@@ -36,7 +36,7 @@ var TypeScript;
             return options || (options = new AstWalkOptions()), new AstWalker(this.childrenWalkers, pre, post, options, state);
         }
         initChildrenWalkers() {
-            for(var e in this.childrenWalkers[NodeType.None] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Empty] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.EmptyExpr] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.True] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.False] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.This] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Super] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.QString] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Regex] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Null] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.ArrayLit] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.ObjectLit] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Void] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Comma] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Pos] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Neg] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Delete] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Await] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.In] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Dot] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.From] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Is] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.InstOf] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Typeof] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.NumberLit] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Name] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.TypeRef] = ChildrenWalkers1.walkTypeReferenceChildren, this.childrenWalkers[NodeType.Index] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Call] = ChildrenWalkers1.walkCallExpressionChildren, this.childrenWalkers[NodeType.New] = ChildrenWalkers1.walkCallExpressionChildren, this.childrenWalkers[NodeType.Asg] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgAdd] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgSub] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgDiv] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgMul] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgMod] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgAnd] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgXor] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgOr] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgLsh] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgRsh] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgRs2] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.ConditionalExpression] = ChildrenWalkers1.walkTrinaryExpressionChildren, this.childrenWalkers[NodeType.LogOr] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.LogAnd] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Or] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Xor] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.And] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Eq] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Ne] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Eqv] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.NEqv] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Lt] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Le] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Gt] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Ge] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Add] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Sub] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Mul] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Div] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Mod] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Lsh] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Rsh] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Rs2] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Not] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.LogNot] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.IncPre] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.DecPre] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.IncPost] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.DecPost] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.TypeAssertion] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.FuncDecl] = ChildrenWalkers1.walkFuncDeclChildren, this.childrenWalkers[NodeType.Member] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.VarDecl] = ChildrenWalkers1.walkBoundDeclChildren, this.childrenWalkers[NodeType.ArgDecl] = ChildrenWalkers1.walkBoundDeclChildren, this.childrenWalkers[NodeType.Return] = ChildrenWalkers1.walkReturnStatementChildren, this.childrenWalkers[NodeType.Break] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Continue] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Throw] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.For] = ChildrenWalkers1.walkForStatementChildren, this.childrenWalkers[NodeType.ForIn] = ChildrenWalkers1.walkForInStatementChildren, this.childrenWalkers[NodeType.If] = ChildrenWalkers1.walkIfStatementChildren, this.childrenWalkers[NodeType.While] = ChildrenWalkers1.walkWhileStatementChildren, this.childrenWalkers[NodeType.DoWhile] = ChildrenWalkers1.walkDoWhileStatementChildren, this.childrenWalkers[NodeType.Block] = ChildrenWalkers1.walkBlockChildren, this.childrenWalkers[NodeType.Case] = ChildrenWalkers1.walkCaseStatementChildren, this.childrenWalkers[NodeType.Switch] = ChildrenWalkers1.walkSwitchStatementChildren, this.childrenWalkers[NodeType.Try] = ChildrenWalkers1.walkTryChildren, this.childrenWalkers[NodeType.TryCatch] = ChildrenWalkers1.walkTryCatchChildren, this.childrenWalkers[NodeType.TryFinally] = ChildrenWalkers1.walkTryFinallyChildren, this.childrenWalkers[NodeType.Finally] = ChildrenWalkers1.walkFinallyChildren, this.childrenWalkers[NodeType.Catch] = ChildrenWalkers1.walkCatchChildren, this.childrenWalkers[NodeType.List] = ChildrenWalkers1.walkListChildren, this.childrenWalkers[NodeType.Script] = ChildrenWalkers1.walkScriptChildren, this.childrenWalkers[NodeType.ClassDeclaration] = ChildrenWalkers1.walkClassDeclChildren, this.childrenWalkers[NodeType.InterfaceDeclaration] = ChildrenWalkers1.walkTypeDeclChildren, this.childrenWalkers[NodeType.ModuleDeclaration] = ChildrenWalkers1.walkModuleDeclChildren, this.childrenWalkers[NodeType.ImportDeclaration] = ChildrenWalkers1.walkImportDeclChildren, this.childrenWalkers[NodeType.With] = ChildrenWalkers1.walkWithStatementChildren, this.childrenWalkers[NodeType.Label] = ChildrenWalkers1.walkLabelChildren, this.childrenWalkers[NodeType.LabeledStatement] = ChildrenWalkers1.walkLabeledStatementChildren, this.childrenWalkers[NodeType.EBStart] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.GotoEB] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.EndCode] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Error] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Comment] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Debugger] = ChildrenWalkers1.walkNone, NodeType._map)if (void 0 === this.childrenWalkers[e]) throw new Error("initWalkers function is not up to date with enum content!");
+            for(var e in this.childrenWalkers[NodeType.None] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Empty] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.EmptyExpr] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.True] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.False] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.This] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Super] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.QString] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Regex] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Null] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.ArrayLit] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.ObjectLit] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Void] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Comma] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Pos] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Neg] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Delete] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Await] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.In] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Dot] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.From] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Is] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.InstOf] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Typeof] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.NumberLit] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Name] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.TypeRef] = ChildrenWalkers.walkTypeReferenceChildren, this.childrenWalkers[NodeType.Index] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Call] = ChildrenWalkers.walkCallExpressionChildren, this.childrenWalkers[NodeType.New] = ChildrenWalkers.walkCallExpressionChildren, this.childrenWalkers[NodeType.Asg] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgAdd] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgSub] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgDiv] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgMul] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgMod] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgAnd] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgXor] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgOr] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgLsh] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgRsh] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgRs2] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.ConditionalExpression] = ChildrenWalkers.walkTrinaryExpressionChildren, this.childrenWalkers[NodeType.LogOr] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.LogAnd] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Or] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Xor] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.And] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Eq] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Ne] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Eqv] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.NEqv] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Lt] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Le] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Gt] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Ge] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Add] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Sub] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Mul] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Div] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Mod] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Lsh] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Rsh] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Rs2] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Not] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.LogNot] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.IncPre] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.DecPre] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.IncPost] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.DecPost] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.TypeAssertion] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.FuncDecl] = ChildrenWalkers.walkFuncDeclChildren, this.childrenWalkers[NodeType.Member] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.VarDecl] = ChildrenWalkers.walkBoundDeclChildren, this.childrenWalkers[NodeType.ArgDecl] = ChildrenWalkers.walkBoundDeclChildren, this.childrenWalkers[NodeType.Return] = ChildrenWalkers.walkReturnStatementChildren, this.childrenWalkers[NodeType.Break] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Continue] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Throw] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.For] = ChildrenWalkers.walkForStatementChildren, this.childrenWalkers[NodeType.ForIn] = ChildrenWalkers.walkForInStatementChildren, this.childrenWalkers[NodeType.If] = ChildrenWalkers.walkIfStatementChildren, this.childrenWalkers[NodeType.While] = ChildrenWalkers.walkWhileStatementChildren, this.childrenWalkers[NodeType.DoWhile] = ChildrenWalkers.walkDoWhileStatementChildren, this.childrenWalkers[NodeType.Block] = ChildrenWalkers.walkBlockChildren, this.childrenWalkers[NodeType.Case] = ChildrenWalkers.walkCaseStatementChildren, this.childrenWalkers[NodeType.Switch] = ChildrenWalkers.walkSwitchStatementChildren, this.childrenWalkers[NodeType.Try] = ChildrenWalkers.walkTryChildren, this.childrenWalkers[NodeType.TryCatch] = ChildrenWalkers.walkTryCatchChildren, this.childrenWalkers[NodeType.TryFinally] = ChildrenWalkers.walkTryFinallyChildren, this.childrenWalkers[NodeType.Finally] = ChildrenWalkers.walkFinallyChildren, this.childrenWalkers[NodeType.Catch] = ChildrenWalkers.walkCatchChildren, this.childrenWalkers[NodeType.List] = ChildrenWalkers.walkListChildren, this.childrenWalkers[NodeType.Script] = ChildrenWalkers.walkScriptChildren, this.childrenWalkers[NodeType.ClassDeclaration] = ChildrenWalkers.walkClassDeclChildren, this.childrenWalkers[NodeType.InterfaceDeclaration] = ChildrenWalkers.walkTypeDeclChildren, this.childrenWalkers[NodeType.ModuleDeclaration] = ChildrenWalkers.walkModuleDeclChildren, this.childrenWalkers[NodeType.ImportDeclaration] = ChildrenWalkers.walkImportDeclChildren, this.childrenWalkers[NodeType.With] = ChildrenWalkers.walkWithStatementChildren, this.childrenWalkers[NodeType.Label] = ChildrenWalkers.walkLabelChildren, this.childrenWalkers[NodeType.LabeledStatement] = ChildrenWalkers.walkLabeledStatementChildren, this.childrenWalkers[NodeType.EBStart] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.GotoEB] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.EndCode] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Error] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Comment] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Debugger] = ChildrenWalkers.walkNone, NodeType._map)if (void 0 === this.childrenWalkers[e]) throw new Error("initWalkers function is not up to date with enum content!");
         }
         constructor(){
             this.childrenWalkers = [], this.initChildrenWalkers();
@@ -44,7 +44,9 @@ var TypeScript;
     }
     TypeScript1.AstWalkerFactory = AstWalkerFactory, TypeScript1.getAstWalkerFactory = function() {
         return globalAstWalkerFactory || (globalAstWalkerFactory = new AstWalkerFactory()), globalAstWalkerFactory;
-    }, (function(ChildrenWalkers) {
+    };
+    let ChildrenWalkers1;
+    !function(ChildrenWalkers) {
         function walkRecordChildren(preAst, parent, walker) {
             preAst.name = walker.walk(preAst.name, preAst), walker.options.goNextSibling && preAst.members && (preAst.members = walker.walk(preAst.members, preAst));
         }
@@ -114,7 +116,7 @@ var TypeScript;
         }, ChildrenWalkers.walkLabeledStatementChildren = function(preAst, parent, walker) {
             preAst.labels = walker.walk(preAst.labels, preAst), walker.options.goNextSibling && (preAst.stmt = walker.walk(preAst.stmt, preAst));
         };
-    })(ChildrenWalkers1 || (ChildrenWalkers1 = {
+    }(ChildrenWalkers1 || (ChildrenWalkers1 = {
     }));
 }(TypeScript || (TypeScript = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es5.1.normal/output.js
index 93b47a9cdab..6f1e4150c5b 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es5.1.normal/output.js
@@ -124,113 +124,113 @@ var TypeScript;
             {
                 key: "initChildrenWalkers",
                 value: function initChildrenWalkers() {
-                    this.childrenWalkers[NodeType.None] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.Empty] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.EmptyExpr] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.True] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.False] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.This] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.Super] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.QString] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.Regex] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.Null] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.ArrayLit] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.ObjectLit] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Void] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Comma] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Pos] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Neg] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Delete] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Await] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.In] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Dot] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.From] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Is] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.InstOf] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Typeof] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.NumberLit] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.Name] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.TypeRef] = ChildrenWalkers1.walkTypeReferenceChildren;
-                    this.childrenWalkers[NodeType.Index] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Call] = ChildrenWalkers1.walkCallExpressionChildren;
-                    this.childrenWalkers[NodeType.New] = ChildrenWalkers1.walkCallExpressionChildren;
-                    this.childrenWalkers[NodeType.Asg] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgAdd] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgSub] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgDiv] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgMul] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgMod] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgAnd] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgXor] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgOr] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgLsh] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgRsh] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.AsgRs2] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.ConditionalExpression] = ChildrenWalkers1.walkTrinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.LogOr] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.LogAnd] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Or] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Xor] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.And] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Eq] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Ne] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Eqv] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.NEqv] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Lt] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Le] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Gt] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Ge] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Add] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Sub] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Mul] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Div] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Mod] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Lsh] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Rsh] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Rs2] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.Not] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.LogNot] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.IncPre] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.DecPre] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.IncPost] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.DecPost] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.TypeAssertion] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.FuncDecl] = ChildrenWalkers1.walkFuncDeclChildren;
-                    this.childrenWalkers[NodeType.Member] = ChildrenWalkers1.walkBinaryExpressionChildren;
-                    this.childrenWalkers[NodeType.VarDecl] = ChildrenWalkers1.walkBoundDeclChildren;
-                    this.childrenWalkers[NodeType.ArgDecl] = ChildrenWalkers1.walkBoundDeclChildren;
-                    this.childrenWalkers[NodeType.Return] = ChildrenWalkers1.walkReturnStatementChildren;
-                    this.childrenWalkers[NodeType.Break] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.Continue] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.Throw] = ChildrenWalkers1.walkUnaryExpressionChildren;
-                    this.childrenWalkers[NodeType.For] = ChildrenWalkers1.walkForStatementChildren;
-                    this.childrenWalkers[NodeType.ForIn] = ChildrenWalkers1.walkForInStatementChildren;
-                    this.childrenWalkers[NodeType.If] = ChildrenWalkers1.walkIfStatementChildren;
-                    this.childrenWalkers[NodeType.While] = ChildrenWalkers1.walkWhileStatementChildren;
-                    this.childrenWalkers[NodeType.DoWhile] = ChildrenWalkers1.walkDoWhileStatementChildren;
-                    this.childrenWalkers[NodeType.Block] = ChildrenWalkers1.walkBlockChildren;
-                    this.childrenWalkers[NodeType.Case] = ChildrenWalkers1.walkCaseStatementChildren;
-                    this.childrenWalkers[NodeType.Switch] = ChildrenWalkers1.walkSwitchStatementChildren;
-                    this.childrenWalkers[NodeType.Try] = ChildrenWalkers1.walkTryChildren;
-                    this.childrenWalkers[NodeType.TryCatch] = ChildrenWalkers1.walkTryCatchChildren;
-                    this.childrenWalkers[NodeType.TryFinally] = ChildrenWalkers1.walkTryFinallyChildren;
-                    this.childrenWalkers[NodeType.Finally] = ChildrenWalkers1.walkFinallyChildren;
-                    this.childrenWalkers[NodeType.Catch] = ChildrenWalkers1.walkCatchChildren;
-                    this.childrenWalkers[NodeType.List] = ChildrenWalkers1.walkListChildren;
-                    this.childrenWalkers[NodeType.Script] = ChildrenWalkers1.walkScriptChildren;
-                    this.childrenWalkers[NodeType.ClassDeclaration] = ChildrenWalkers1.walkClassDeclChildren;
-                    this.childrenWalkers[NodeType.InterfaceDeclaration] = ChildrenWalkers1.walkTypeDeclChildren;
-                    this.childrenWalkers[NodeType.ModuleDeclaration] = ChildrenWalkers1.walkModuleDeclChildren;
-                    this.childrenWalkers[NodeType.ImportDeclaration] = ChildrenWalkers1.walkImportDeclChildren;
-                    this.childrenWalkers[NodeType.With] = ChildrenWalkers1.walkWithStatementChildren;
-                    this.childrenWalkers[NodeType.Label] = ChildrenWalkers1.walkLabelChildren;
-                    this.childrenWalkers[NodeType.LabeledStatement] = ChildrenWalkers1.walkLabeledStatementChildren;
-                    this.childrenWalkers[NodeType.EBStart] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.GotoEB] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.EndCode] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.Error] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.Comment] = ChildrenWalkers1.walkNone;
-                    this.childrenWalkers[NodeType.Debugger] = ChildrenWalkers1.walkNone;
+                    this.childrenWalkers[NodeType.None] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.Empty] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.EmptyExpr] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.True] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.False] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.This] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.Super] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.QString] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.Regex] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.Null] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.ArrayLit] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.ObjectLit] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Void] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Comma] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Pos] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Neg] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Delete] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Await] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.In] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Dot] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.From] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Is] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.InstOf] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Typeof] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.NumberLit] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.Name] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.TypeRef] = ChildrenWalkers.walkTypeReferenceChildren;
+                    this.childrenWalkers[NodeType.Index] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Call] = ChildrenWalkers.walkCallExpressionChildren;
+                    this.childrenWalkers[NodeType.New] = ChildrenWalkers.walkCallExpressionChildren;
+                    this.childrenWalkers[NodeType.Asg] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgAdd] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgSub] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgDiv] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgMul] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgMod] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgAnd] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgXor] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgOr] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgLsh] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgRsh] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.AsgRs2] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.ConditionalExpression] = ChildrenWalkers.walkTrinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.LogOr] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.LogAnd] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Or] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Xor] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.And] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Eq] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Ne] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Eqv] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.NEqv] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Lt] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Le] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Gt] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Ge] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Add] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Sub] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Mul] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Div] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Mod] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Lsh] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Rsh] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Rs2] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.Not] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.LogNot] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.IncPre] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.DecPre] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.IncPost] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.DecPost] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.TypeAssertion] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.FuncDecl] = ChildrenWalkers.walkFuncDeclChildren;
+                    this.childrenWalkers[NodeType.Member] = ChildrenWalkers.walkBinaryExpressionChildren;
+                    this.childrenWalkers[NodeType.VarDecl] = ChildrenWalkers.walkBoundDeclChildren;
+                    this.childrenWalkers[NodeType.ArgDecl] = ChildrenWalkers.walkBoundDeclChildren;
+                    this.childrenWalkers[NodeType.Return] = ChildrenWalkers.walkReturnStatementChildren;
+                    this.childrenWalkers[NodeType.Break] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.Continue] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.Throw] = ChildrenWalkers.walkUnaryExpressionChildren;
+                    this.childrenWalkers[NodeType.For] = ChildrenWalkers.walkForStatementChildren;
+                    this.childrenWalkers[NodeType.ForIn] = ChildrenWalkers.walkForInStatementChildren;
+                    this.childrenWalkers[NodeType.If] = ChildrenWalkers.walkIfStatementChildren;
+                    this.childrenWalkers[NodeType.While] = ChildrenWalkers.walkWhileStatementChildren;
+                    this.childrenWalkers[NodeType.DoWhile] = ChildrenWalkers.walkDoWhileStatementChildren;
+                    this.childrenWalkers[NodeType.Block] = ChildrenWalkers.walkBlockChildren;
+                    this.childrenWalkers[NodeType.Case] = ChildrenWalkers.walkCaseStatementChildren;
+                    this.childrenWalkers[NodeType.Switch] = ChildrenWalkers.walkSwitchStatementChildren;
+                    this.childrenWalkers[NodeType.Try] = ChildrenWalkers.walkTryChildren;
+                    this.childrenWalkers[NodeType.TryCatch] = ChildrenWalkers.walkTryCatchChildren;
+                    this.childrenWalkers[NodeType.TryFinally] = ChildrenWalkers.walkTryFinallyChildren;
+                    this.childrenWalkers[NodeType.Finally] = ChildrenWalkers.walkFinallyChildren;
+                    this.childrenWalkers[NodeType.Catch] = ChildrenWalkers.walkCatchChildren;
+                    this.childrenWalkers[NodeType.List] = ChildrenWalkers.walkListChildren;
+                    this.childrenWalkers[NodeType.Script] = ChildrenWalkers.walkScriptChildren;
+                    this.childrenWalkers[NodeType.ClassDeclaration] = ChildrenWalkers.walkClassDeclChildren;
+                    this.childrenWalkers[NodeType.InterfaceDeclaration] = ChildrenWalkers.walkTypeDeclChildren;
+                    this.childrenWalkers[NodeType.ModuleDeclaration] = ChildrenWalkers.walkModuleDeclChildren;
+                    this.childrenWalkers[NodeType.ImportDeclaration] = ChildrenWalkers.walkImportDeclChildren;
+                    this.childrenWalkers[NodeType.With] = ChildrenWalkers.walkWithStatementChildren;
+                    this.childrenWalkers[NodeType.Label] = ChildrenWalkers.walkLabelChildren;
+                    this.childrenWalkers[NodeType.LabeledStatement] = ChildrenWalkers.walkLabeledStatementChildren;
+                    this.childrenWalkers[NodeType.EBStart] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.GotoEB] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.EndCode] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.Error] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.Comment] = ChildrenWalkers.walkNone;
+                    this.childrenWalkers[NodeType.Debugger] = ChildrenWalkers.walkNone;
                     // Verify the code is up to date with the enum
                     for(var e in NodeType._map){
                         if (this.childrenWalkers[e] === undefined) {
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es5.2.minified/output.js
index da91b7badd3..225331d3a8d 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource12/input.ts/es5.2.minified/output.js
@@ -12,9 +12,7 @@ function _createClass(Constructor, protoProps, staticProps) {
     return protoProps && _defineProperties(Constructor.prototype, protoProps), staticProps && _defineProperties(Constructor, staticProps), Constructor;
 }
 !function(TypeScript1) {
-    var globalAstWalkerFactory, ChildrenWalkers1, getAstWalkerFactory = function() {
-        return globalAstWalkerFactory || (globalAstWalkerFactory = new AstWalkerFactory()), globalAstWalkerFactory;
-    }, AstWalkOptions = function() {
+    var globalAstWalkerFactory, ChildrenWalkers1, AstWalkOptions = function() {
         "use strict";
         function AstWalkOptions() {
             _classCallCheck(this, AstWalkOptions), this.goChildren = !0, this.goNextSibling = !0, this.reverseSiblings = !1;
@@ -77,12 +75,14 @@ function _createClass(Constructor, protoProps, staticProps) {
             {
                 key: "initChildrenWalkers",
                 value: function() {
-                    for(var e in this.childrenWalkers[NodeType.None] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Empty] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.EmptyExpr] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.True] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.False] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.This] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Super] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.QString] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Regex] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Null] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.ArrayLit] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.ObjectLit] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Void] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Comma] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Pos] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Neg] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Delete] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Await] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.In] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Dot] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.From] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Is] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.InstOf] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Typeof] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.NumberLit] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Name] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.TypeRef] = ChildrenWalkers1.walkTypeReferenceChildren, this.childrenWalkers[NodeType.Index] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Call] = ChildrenWalkers1.walkCallExpressionChildren, this.childrenWalkers[NodeType.New] = ChildrenWalkers1.walkCallExpressionChildren, this.childrenWalkers[NodeType.Asg] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgAdd] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgSub] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgDiv] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgMul] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgMod] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgAnd] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgXor] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgOr] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgLsh] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgRsh] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgRs2] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.ConditionalExpression] = ChildrenWalkers1.walkTrinaryExpressionChildren, this.childrenWalkers[NodeType.LogOr] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.LogAnd] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Or] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Xor] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.And] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Eq] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Ne] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Eqv] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.NEqv] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Lt] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Le] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Gt] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Ge] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Add] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Sub] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Mul] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Div] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Mod] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Lsh] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Rsh] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Rs2] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Not] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.LogNot] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.IncPre] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.DecPre] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.IncPost] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.DecPost] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.TypeAssertion] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.FuncDecl] = ChildrenWalkers1.walkFuncDeclChildren, this.childrenWalkers[NodeType.Member] = ChildrenWalkers1.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.VarDecl] = ChildrenWalkers1.walkBoundDeclChildren, this.childrenWalkers[NodeType.ArgDecl] = ChildrenWalkers1.walkBoundDeclChildren, this.childrenWalkers[NodeType.Return] = ChildrenWalkers1.walkReturnStatementChildren, this.childrenWalkers[NodeType.Break] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Continue] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Throw] = ChildrenWalkers1.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.For] = ChildrenWalkers1.walkForStatementChildren, this.childrenWalkers[NodeType.ForIn] = ChildrenWalkers1.walkForInStatementChildren, this.childrenWalkers[NodeType.If] = ChildrenWalkers1.walkIfStatementChildren, this.childrenWalkers[NodeType.While] = ChildrenWalkers1.walkWhileStatementChildren, this.childrenWalkers[NodeType.DoWhile] = ChildrenWalkers1.walkDoWhileStatementChildren, this.childrenWalkers[NodeType.Block] = ChildrenWalkers1.walkBlockChildren, this.childrenWalkers[NodeType.Case] = ChildrenWalkers1.walkCaseStatementChildren, this.childrenWalkers[NodeType.Switch] = ChildrenWalkers1.walkSwitchStatementChildren, this.childrenWalkers[NodeType.Try] = ChildrenWalkers1.walkTryChildren, this.childrenWalkers[NodeType.TryCatch] = ChildrenWalkers1.walkTryCatchChildren, this.childrenWalkers[NodeType.TryFinally] = ChildrenWalkers1.walkTryFinallyChildren, this.childrenWalkers[NodeType.Finally] = ChildrenWalkers1.walkFinallyChildren, this.childrenWalkers[NodeType.Catch] = ChildrenWalkers1.walkCatchChildren, this.childrenWalkers[NodeType.List] = ChildrenWalkers1.walkListChildren, this.childrenWalkers[NodeType.Script] = ChildrenWalkers1.walkScriptChildren, this.childrenWalkers[NodeType.ClassDeclaration] = ChildrenWalkers1.walkClassDeclChildren, this.childrenWalkers[NodeType.InterfaceDeclaration] = ChildrenWalkers1.walkTypeDeclChildren, this.childrenWalkers[NodeType.ModuleDeclaration] = ChildrenWalkers1.walkModuleDeclChildren, this.childrenWalkers[NodeType.ImportDeclaration] = ChildrenWalkers1.walkImportDeclChildren, this.childrenWalkers[NodeType.With] = ChildrenWalkers1.walkWithStatementChildren, this.childrenWalkers[NodeType.Label] = ChildrenWalkers1.walkLabelChildren, this.childrenWalkers[NodeType.LabeledStatement] = ChildrenWalkers1.walkLabeledStatementChildren, this.childrenWalkers[NodeType.EBStart] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.GotoEB] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.EndCode] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Error] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Comment] = ChildrenWalkers1.walkNone, this.childrenWalkers[NodeType.Debugger] = ChildrenWalkers1.walkNone, NodeType._map)if (void 0 === this.childrenWalkers[e]) throw new Error("initWalkers function is not up to date with enum content!");
+                    for(var e in this.childrenWalkers[NodeType.None] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Empty] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.EmptyExpr] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.True] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.False] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.This] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Super] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.QString] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Regex] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Null] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.ArrayLit] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.ObjectLit] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Void] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Comma] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Pos] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Neg] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Delete] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.Await] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.In] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Dot] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.From] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Is] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.InstOf] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Typeof] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.NumberLit] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Name] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.TypeRef] = ChildrenWalkers.walkTypeReferenceChildren, this.childrenWalkers[NodeType.Index] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Call] = ChildrenWalkers.walkCallExpressionChildren, this.childrenWalkers[NodeType.New] = ChildrenWalkers.walkCallExpressionChildren, this.childrenWalkers[NodeType.Asg] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgAdd] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgSub] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgDiv] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgMul] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgMod] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgAnd] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgXor] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgOr] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgLsh] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgRsh] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.AsgRs2] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.ConditionalExpression] = ChildrenWalkers.walkTrinaryExpressionChildren, this.childrenWalkers[NodeType.LogOr] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.LogAnd] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Or] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Xor] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.And] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Eq] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Ne] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Eqv] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.NEqv] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Lt] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Le] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Gt] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Ge] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Add] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Sub] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Mul] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Div] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Mod] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Lsh] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Rsh] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Rs2] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.Not] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.LogNot] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.IncPre] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.DecPre] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.IncPost] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.DecPost] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.TypeAssertion] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.FuncDecl] = ChildrenWalkers.walkFuncDeclChildren, this.childrenWalkers[NodeType.Member] = ChildrenWalkers.walkBinaryExpressionChildren, this.childrenWalkers[NodeType.VarDecl] = ChildrenWalkers.walkBoundDeclChildren, this.childrenWalkers[NodeType.ArgDecl] = ChildrenWalkers.walkBoundDeclChildren, this.childrenWalkers[NodeType.Return] = ChildrenWalkers.walkReturnStatementChildren, this.childrenWalkers[NodeType.Break] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Continue] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Throw] = ChildrenWalkers.walkUnaryExpressionChildren, this.childrenWalkers[NodeType.For] = ChildrenWalkers.walkForStatementChildren, this.childrenWalkers[NodeType.ForIn] = ChildrenWalkers.walkForInStatementChildren, this.childrenWalkers[NodeType.If] = ChildrenWalkers.walkIfStatementChildren, this.childrenWalkers[NodeType.While] = ChildrenWalkers.walkWhileStatementChildren, this.childrenWalkers[NodeType.DoWhile] = ChildrenWalkers.walkDoWhileStatementChildren, this.childrenWalkers[NodeType.Block] = ChildrenWalkers.walkBlockChildren, this.childrenWalkers[NodeType.Case] = ChildrenWalkers.walkCaseStatementChildren, this.childrenWalkers[NodeType.Switch] = ChildrenWalkers.walkSwitchStatementChildren, this.childrenWalkers[NodeType.Try] = ChildrenWalkers.walkTryChildren, this.childrenWalkers[NodeType.TryCatch] = ChildrenWalkers.walkTryCatchChildren, this.childrenWalkers[NodeType.TryFinally] = ChildrenWalkers.walkTryFinallyChildren, this.childrenWalkers[NodeType.Finally] = ChildrenWalkers.walkFinallyChildren, this.childrenWalkers[NodeType.Catch] = ChildrenWalkers.walkCatchChildren, this.childrenWalkers[NodeType.List] = ChildrenWalkers.walkListChildren, this.childrenWalkers[NodeType.Script] = ChildrenWalkers.walkScriptChildren, this.childrenWalkers[NodeType.ClassDeclaration] = ChildrenWalkers.walkClassDeclChildren, this.childrenWalkers[NodeType.InterfaceDeclaration] = ChildrenWalkers.walkTypeDeclChildren, this.childrenWalkers[NodeType.ModuleDeclaration] = ChildrenWalkers.walkModuleDeclChildren, this.childrenWalkers[NodeType.ImportDeclaration] = ChildrenWalkers.walkImportDeclChildren, this.childrenWalkers[NodeType.With] = ChildrenWalkers.walkWithStatementChildren, this.childrenWalkers[NodeType.Label] = ChildrenWalkers.walkLabelChildren, this.childrenWalkers[NodeType.LabeledStatement] = ChildrenWalkers.walkLabeledStatementChildren, this.childrenWalkers[NodeType.EBStart] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.GotoEB] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.EndCode] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Error] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Comment] = ChildrenWalkers.walkNone, this.childrenWalkers[NodeType.Debugger] = ChildrenWalkers.walkNone, NodeType._map)if (void 0 === this.childrenWalkers[e]) throw new Error("initWalkers function is not up to date with enum content!");
                 }
             }
         ]), AstWalkerFactory;
     }();
-    TypeScript1.AstWalkerFactory = AstWalkerFactory, TypeScript1.getAstWalkerFactory = getAstWalkerFactory, (function(ChildrenWalkers) {
+    TypeScript1.AstWalkerFactory = AstWalkerFactory, TypeScript1.getAstWalkerFactory = function() {
+        return globalAstWalkerFactory || (globalAstWalkerFactory = new AstWalkerFactory()), globalAstWalkerFactory;
+    }, (function(ChildrenWalkers) {
         function walkRecordChildren(preAst, parent, walker) {
             preAst.name = walker.walk(preAst.name, preAst), walker.options.goNextSibling && preAst.members && (preAst.members = walker.walk(preAst.members, preAst));
         }
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es2015.1.normal/output.js
index 0136952a8a6..b5dcef84f74 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es2015.1.normal/output.js
@@ -243,7 +243,7 @@ var TypeScript;
         }
     }
     TypeScript1.AstPathContext = AstPathContext;
-    var GetAstPathOptions1;
+    let GetAstPathOptions;
     (function(GetAstPathOptions) {
         GetAstPathOptions[GetAstPathOptions["Default"] = 0] = "Default";
         GetAstPathOptions[GetAstPathOptions["EdgeInclusive"] = 1] = "EdgeInclusive";
@@ -255,9 +255,9 @@ var TypeScript;
         // we don't find the "precomment" attached to the errorneous empty stmt.
         //TODO: It would be nice to be able to get rid of this.
         "DontPruneSearchBasedOnPosition"] = 2] = "DontPruneSearchBasedOnPosition";
-    })(GetAstPathOptions1 || (GetAstPathOptions1 = {
+    })(GetAstPathOptions || (GetAstPathOptions = {
     }));
-    function getAstPathToPosition(script, pos, options = GetAstPathOptions1.Default) {
+    function getAstPathToPosition(script, pos, options = GetAstPathOptions.Default) {
         var lookInComments = (comments)=>{
             if (comments && comments.length > 0) {
                 for(var i = 0; i < comments.length; i++){
@@ -281,7 +281,7 @@ var TypeScript;
                 //  bar
                 //  0123
                 // If "position == 3", the caret is at the "right" of the "r" character, which should be considered valid
-                var inclusive = hasFlag(options, GetAstPathOptions1.EdgeInclusive) || cur.nodeType === TypeScript.NodeType.Name || pos === script.limChar; // Special "EOF" case
+                var inclusive = hasFlag(options, GetAstPathOptions.EdgeInclusive) || cur.nodeType === TypeScript.NodeType.Name || pos === script.limChar; // Special "EOF" case
                 var minChar = cur.minChar;
                 var limChar = cur.limChar + (inclusive ? 1 : 0);
                 if (pos >= minChar && pos < limChar) {
@@ -301,7 +301,7 @@ var TypeScript;
                 if (pos >= minChar) {
                     lookInComments(cur.postComments);
                 }
-                if (!hasFlag(options, GetAstPathOptions1.DontPruneSearchBasedOnPosition)) {
+                if (!hasFlag(options, GetAstPathOptions.DontPruneSearchBasedOnPosition)) {
                     // Don't go further down the tree if pos is outside of [minChar, limChar]
                     walker.options.goChildren = minChar <= pos && pos <= limChar;
                 }
@@ -348,6 +348,6 @@ var TypeScript;
         TypeScript.getAstWalkerFactory().walk(ast, pre, post, null, path1);
     }
     TypeScript1.walkAST = walkAST;
-    TypeScript1.GetAstPathOptions = GetAstPathOptions1;
+    TypeScript1.GetAstPathOptions = GetAstPathOptions;
 })(TypeScript || (TypeScript = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es2015.2.minified/output.js
index e297bd84618..31d7f0a5437 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
 var TypeScript;
 !function(TypeScript1) {
-    var GetAstPathOptions, GetAstPathOptions1;
+    var GetAstPathOptions;
     function lastOf(items) {
         return null === items || 0 === items.length ? null : items[items.length - 1];
     }
@@ -216,8 +216,10 @@ var TypeScript;
             this.path = new TypeScript.AstPath();
         }
     }
-    TypeScript1.AstPathContext = AstPathContext, (GetAstPathOptions1 = GetAstPathOptions || (GetAstPathOptions = {
-    }))[GetAstPathOptions1.Default = 0] = "Default", GetAstPathOptions1[GetAstPathOptions1.EdgeInclusive = 1] = "EdgeInclusive", GetAstPathOptions1[GetAstPathOptions1.DontPruneSearchBasedOnPosition = 2] = "DontPruneSearchBasedOnPosition", TypeScript1.getAstPathToPosition = function(script, pos, options = GetAstPathOptions.Default) {
+    TypeScript1.AstPathContext = AstPathContext;
+    let GetAstPathOptions;
+    (GetAstPathOptions = GetAstPathOptions || (GetAstPathOptions = {
+    }))[GetAstPathOptions.Default = 0] = "Default", GetAstPathOptions[GetAstPathOptions.EdgeInclusive = 1] = "EdgeInclusive", GetAstPathOptions[GetAstPathOptions.DontPruneSearchBasedOnPosition = 2] = "DontPruneSearchBasedOnPosition", TypeScript1.getAstPathToPosition = function(script, pos, options = GetAstPathOptions.Default) {
         var lookInComments = (comments)=>{
             if (comments && comments.length > 0) for(var i = 0; i < comments.length; i++){
                 var minChar = comments[i].minChar, limChar = comments[i].limChar;
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es5.1.normal/output.js
index 2929632a238..cb8b95f2442 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es5.1.normal/output.js
@@ -37,7 +37,7 @@ var TypeScript;
         return true;
     };
     var getAstPathToPosition = function getAstPathToPosition(script, pos) {
-        var options = arguments.length > 2 && arguments[2] !== void 0 ? arguments[2] : GetAstPathOptions1.Default;
+        var options = arguments.length > 2 && arguments[2] !== void 0 ? arguments[2] : GetAstPathOptions.Default;
         var lookInComments = function(comments) {
             if (comments && comments.length > 0) {
                 for(var i = 0; i < comments.length; i++){
@@ -61,7 +61,7 @@ var TypeScript;
                 //  bar
                 //  0123
                 // If "position == 3", the caret is at the "right" of the "r" character, which should be considered valid
-                var inclusive = hasFlag(options, GetAstPathOptions1.EdgeInclusive) || cur.nodeType === TypeScript.NodeType.Name || pos === script.limChar; // Special "EOF" case
+                var inclusive = hasFlag(options, GetAstPathOptions.EdgeInclusive) || cur.nodeType === TypeScript.NodeType.Name || pos === script.limChar; // Special "EOF" case
                 var minChar = cur.minChar;
                 var limChar = cur.limChar + (inclusive ? 1 : 0);
                 if (pos >= minChar && pos < limChar) {
@@ -81,7 +81,7 @@ var TypeScript;
                 if (pos >= minChar) {
                     lookInComments(cur.postComments);
                 }
-                if (!hasFlag(options, GetAstPathOptions1.DontPruneSearchBasedOnPosition)) {
+                if (!hasFlag(options, GetAstPathOptions.DontPruneSearchBasedOnPosition)) {
                     // Don't go further down the tree if pos is outside of [minChar, limChar]
                     walker.options.goChildren = minChar <= pos && pos <= limChar;
                 }
@@ -537,7 +537,7 @@ var TypeScript;
         this.path = new TypeScript.AstPath();
     };
     TypeScript1.AstPathContext = AstPathContext;
-    var GetAstPathOptions1;
+    var GetAstPathOptions;
     (function(GetAstPathOptions) {
         GetAstPathOptions[GetAstPathOptions["Default"] = 0] = "Default";
         GetAstPathOptions[GetAstPathOptions["EdgeInclusive"] = 1] = "EdgeInclusive";
@@ -549,11 +549,11 @@ var TypeScript;
         // we don't find the "precomment" attached to the errorneous empty stmt.
         //TODO: It would be nice to be able to get rid of this.
         "DontPruneSearchBasedOnPosition"] = 2] = "DontPruneSearchBasedOnPosition";
-    })(GetAstPathOptions1 || (GetAstPathOptions1 = {
+    })(GetAstPathOptions || (GetAstPathOptions = {
     }));
     TypeScript1.getAstPathToPosition = getAstPathToPosition;
     TypeScript1.getTokenizationOffset = getTokenizationOffset;
     TypeScript1.walkAST = walkAST;
-    TypeScript1.GetAstPathOptions = GetAstPathOptions1;
+    TypeScript1.GetAstPathOptions = GetAstPathOptions;
 })(TypeScript || (TypeScript = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es5.2.minified/output.js
index f2f331b8361..fdd8587bf94 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource14/input.ts/es5.2.minified/output.js
@@ -434,11 +434,11 @@ function _defineProperties(target, props) {
         ], protoProps && _defineProperties(Constructor.prototype, protoProps), staticProps && _defineProperties(Constructor, staticProps), AstPath;
     }();
     TypeScript1.AstPath = AstPath, TypeScript1.isValidAstNode = isValidAstNode;
-    var GetAstPathOptions1, AstPathContext = function AstPathContext() {
+    var GetAstPathOptions, AstPathContext = function AstPathContext() {
         "use strict";
         _classCallCheck(this, AstPathContext), this.path = new TypeScript.AstPath();
     };
-    TypeScript1.AstPathContext = AstPathContext, (GetAstPathOptions1 = GetAstPathOptions || (GetAstPathOptions = {
-    }))[GetAstPathOptions1.Default = 0] = "Default", GetAstPathOptions1[GetAstPathOptions1.EdgeInclusive = 1] = "EdgeInclusive", GetAstPathOptions1[GetAstPathOptions1.DontPruneSearchBasedOnPosition = 2] = "DontPruneSearchBasedOnPosition", TypeScript1.getAstPathToPosition = getAstPathToPosition, TypeScript1.getTokenizationOffset = getTokenizationOffset, TypeScript1.walkAST = walkAST, TypeScript1.GetAstPathOptions = GetAstPathOptions;
+    TypeScript1.AstPathContext = AstPathContext, (GetAstPathOptions = GetAstPathOptions || (GetAstPathOptions = {
+    }))[GetAstPathOptions.Default = 0] = "Default", GetAstPathOptions[GetAstPathOptions.EdgeInclusive = 1] = "EdgeInclusive", GetAstPathOptions[GetAstPathOptions.DontPruneSearchBasedOnPosition = 2] = "DontPruneSearchBasedOnPosition", TypeScript1.getAstPathToPosition = getAstPathToPosition, TypeScript1.getTokenizationOffset = getTokenizationOffset, TypeScript1.walkAST = walkAST, TypeScript1.GetAstPathOptions = GetAstPathOptions;
 }(TypeScript || (TypeScript = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es2015.1.normal/output.js
index 35d0b7a8ed1..7cdce519d72 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es2015.1.normal/output.js
@@ -7,7 +7,7 @@ var TypeScript;
         return (val & flag) != 0;
     }
     TypeScript1.hasFlag = hasFlag;
-    var ErrorRecoverySet1;
+    let ErrorRecoverySet;
     (function(ErrorRecoverySet) {
         ErrorRecoverySet[ErrorRecoverySet["None"] = 0] = "None";
         ErrorRecoverySet[ErrorRecoverySet["Comma"] = 1] = "Comma";
@@ -47,9 +47,9 @@ var TypeScript;
         ErrorRecoverySet[ErrorRecoverySet["ExprStart"] = 520158210] = "ExprStart";
         ErrorRecoverySet[ErrorRecoverySet["StmtStart"] = 1608580098] = "StmtStart";
         ErrorRecoverySet[ErrorRecoverySet["Postfix"] = 49280] = "Postfix";
-    })(ErrorRecoverySet1 || (ErrorRecoverySet1 = {
+    })(ErrorRecoverySet || (ErrorRecoverySet = {
     }));
-    var AllowedElements1;
+    let AllowedElements;
     (function(AllowedElements) {
         AllowedElements[AllowedElements["None"] = 0] = "None";
         AllowedElements[AllowedElements["ModuleDeclarations"] = 4] = "ModuleDeclarations";
@@ -59,9 +59,9 @@ var TypeScript;
         AllowedElements[AllowedElements["Properties"] = 2048] = "Properties";
         AllowedElements[AllowedElements["Global"] = 1052] = "Global";
         AllowedElements[AllowedElements["QuickParse"] = 3100] = "QuickParse";
-    })(AllowedElements1 || (AllowedElements1 = {
+    })(AllowedElements || (AllowedElements = {
     }));
-    var Modifiers1;
+    let Modifiers;
     (function(Modifiers) {
         Modifiers[Modifiers["None"] = 0] = "None";
         Modifiers[Modifiers["Private"] = 1] = "Private";
@@ -72,9 +72,9 @@ var TypeScript;
         Modifiers[Modifiers["Getter"] = 32] = "Getter";
         Modifiers[Modifiers["Setter"] = 64] = "Setter";
         Modifiers[Modifiers["Static"] = 128] = "Static";
-    })(Modifiers1 || (Modifiers1 = {
+    })(Modifiers || (Modifiers = {
     }));
-    var ASTFlags1;
+    let ASTFlags;
     (function(ASTFlags) {
         ASTFlags[ASTFlags["None"] = 0] = "None";
         ASTFlags[ASTFlags["ExplicitSemicolon"] = 1] = "ExplicitSemicolon";
@@ -92,9 +92,9 @@ var TypeScript;
         //         The flag is used to communicate this piece of information to the calling parseTerm, which intern will remove it.
         //         Once we have a better way to associate information with nodes, this flag should not be used.
         "SkipNextRParen"] = 2048] = "SkipNextRParen";
-    })(ASTFlags1 || (ASTFlags1 = {
+    })(ASTFlags || (ASTFlags = {
     }));
-    var DeclFlags1;
+    let DeclFlags;
     (function(DeclFlags) {
         DeclFlags[DeclFlags["None"] = 0] = "None";
         DeclFlags[DeclFlags["Exported"] = 1] = "Exported";
@@ -105,9 +105,9 @@ var TypeScript;
         DeclFlags[DeclFlags["LocalStatic"] = 32] = "LocalStatic";
         DeclFlags[DeclFlags["GetAccessor"] = 64] = "GetAccessor";
         DeclFlags[DeclFlags["SetAccessor"] = 128] = "SetAccessor";
-    })(DeclFlags1 || (DeclFlags1 = {
+    })(DeclFlags || (DeclFlags = {
     }));
-    var ModuleFlags1;
+    let ModuleFlags;
     (function(ModuleFlags) {
         ModuleFlags[ModuleFlags["None"] = 0] = "None";
         ModuleFlags[ModuleFlags["Exported"] = 1] = "Exported";
@@ -123,9 +123,9 @@ var TypeScript;
         ModuleFlags[ModuleFlags["IsWholeFile"] = 1024] = "IsWholeFile";
         ModuleFlags[ModuleFlags["IsDynamic"] = 2048] = "IsDynamic";
         ModuleFlags[ModuleFlags["MustCaptureThis"] = 4096] = "MustCaptureThis";
-    })(ModuleFlags1 || (ModuleFlags1 = {
+    })(ModuleFlags || (ModuleFlags = {
     }));
-    var SymbolFlags1;
+    let SymbolFlags;
     (function(SymbolFlags) {
         SymbolFlags[SymbolFlags["None"] = 0] = "None";
         SymbolFlags[SymbolFlags["Exported"] = 1] = "Exported";
@@ -148,9 +148,9 @@ var TypeScript;
         SymbolFlags[SymbolFlags["RecursivelyReferenced"] = 131072] = "RecursivelyReferenced";
         SymbolFlags[SymbolFlags["Bound"] = 262144] = "Bound";
         SymbolFlags[SymbolFlags["CompilerGenerated"] = 524288] = "CompilerGenerated";
-    })(SymbolFlags1 || (SymbolFlags1 = {
+    })(SymbolFlags || (SymbolFlags = {
     }));
-    var VarFlags1;
+    let VarFlags;
     (function(VarFlags) {
         VarFlags[VarFlags["None"] = 0] = "None";
         VarFlags[VarFlags["Exported"] = 1] = "Exported";
@@ -171,9 +171,9 @@ var TypeScript;
         VarFlags[VarFlags["ClassSuperMustBeFirstCallInConstructor"] = 32768] = "ClassSuperMustBeFirstCallInConstructor";
         VarFlags[VarFlags["Constant"] = 65536] = "Constant";
         VarFlags[VarFlags["MustCaptureThis"] = 131072] = "MustCaptureThis";
-    })(VarFlags1 || (VarFlags1 = {
+    })(VarFlags || (VarFlags = {
     }));
-    var FncFlags1;
+    let FncFlags;
     (function(FncFlags) {
         FncFlags[FncFlags["None"] = 0] = "None";
         FncFlags[FncFlags["Exported"] = 1] = "Exported";
@@ -196,21 +196,21 @@ var TypeScript;
         FncFlags[FncFlags["IsFunctionExpression"] = 131072] = "IsFunctionExpression";
         FncFlags[FncFlags["ClassMethod"] = 262144] = "ClassMethod";
         FncFlags[FncFlags["ClassPropertyMethodExported"] = 524288] = "ClassPropertyMethodExported";
-    })(FncFlags1 || (FncFlags1 = {
+    })(FncFlags || (FncFlags = {
     }));
-    var SignatureFlags1;
+    let SignatureFlags;
     (function(SignatureFlags) {
         SignatureFlags[SignatureFlags["None"] = 0] = "None";
         SignatureFlags[SignatureFlags["IsIndexer"] = 1] = "IsIndexer";
         SignatureFlags[SignatureFlags["IsStringIndexer"] = 2] = "IsStringIndexer";
         SignatureFlags[SignatureFlags["IsNumberIndexer"] = 4] = "IsNumberIndexer";
-    })(SignatureFlags1 || (SignatureFlags1 = {
+    })(SignatureFlags || (SignatureFlags = {
     }));
     function ToDeclFlags(fncOrVarOrSymbolOrModuleFlags) {
         return fncOrVarOrSymbolOrModuleFlags;
     }
     TypeScript1.ToDeclFlags = ToDeclFlags;
-    var TypeFlags1;
+    let TypeFlags;
     (function(TypeFlags) {
         TypeFlags[TypeFlags["None"] = 0] = "None";
         TypeFlags[TypeFlags["HasImplementation"] = 1] = "HasImplementation";
@@ -221,9 +221,9 @@ var TypeScript;
         TypeFlags[TypeFlags["HasBaseType"] = 32] = "HasBaseType";
         TypeFlags[TypeFlags["HasBaseTypeOfObject"] = 64] = "HasBaseTypeOfObject";
         TypeFlags[TypeFlags["IsClass"] = 128] = "IsClass";
-    })(TypeFlags1 || (TypeFlags1 = {
+    })(TypeFlags || (TypeFlags = {
     }));
-    var TypeRelationshipFlags1;
+    let TypeRelationshipFlags;
     (function(TypeRelationshipFlags) {
         TypeRelationshipFlags[TypeRelationshipFlags["SuccessfulComparison"] = 0] = "SuccessfulComparison";
         TypeRelationshipFlags[TypeRelationshipFlags["SourceIsNullTargetIsVoidOrUndefined"] = 1] = "SourceIsNullTargetIsVoidOrUndefined";
@@ -233,23 +233,23 @@ var TypeScript;
         TypeRelationshipFlags[TypeRelationshipFlags["IncompatibleReturnTypes"] = 16] = "IncompatibleReturnTypes";
         TypeRelationshipFlags[TypeRelationshipFlags["IncompatiblePropertyTypes"] = 32] = "IncompatiblePropertyTypes";
         TypeRelationshipFlags[TypeRelationshipFlags["IncompatibleParameterTypes"] = 64] = "IncompatibleParameterTypes";
-    })(TypeRelationshipFlags1 || (TypeRelationshipFlags1 = {
+    })(TypeRelationshipFlags || (TypeRelationshipFlags = {
     }));
-    var CodeGenTarget1;
+    let CodeGenTarget;
     (function(CodeGenTarget) {
         CodeGenTarget[CodeGenTarget["ES3"] = 0] = "ES3";
         CodeGenTarget[CodeGenTarget["ES5"] = 1] = "ES5";
-    })(CodeGenTarget1 || (CodeGenTarget1 = {
+    })(CodeGenTarget || (CodeGenTarget = {
     }));
-    var ModuleGenTarget1;
+    let ModuleGenTarget;
     (function(ModuleGenTarget) {
         ModuleGenTarget[ModuleGenTarget["Synchronous"] = 0] = "Synchronous";
         ModuleGenTarget[ModuleGenTarget["Asynchronous"] = 1] = "Asynchronous";
         ModuleGenTarget[ModuleGenTarget["Local"] = 2] = "Local";
-    })(ModuleGenTarget1 || (ModuleGenTarget1 = {
+    })(ModuleGenTarget || (ModuleGenTarget = {
     }));
-    TypeScript1.codeGenTarget = CodeGenTarget1.ES3;
-    TypeScript1.moduleGenTarget = ModuleGenTarget1.Synchronous;
+    TypeScript1.codeGenTarget = CodeGenTarget.ES3;
+    TypeScript1.moduleGenTarget = ModuleGenTarget.Synchronous;
     TypeScript1.optimizeModuleCodeGen = true;
     function flagsToString(e, flags) {
         var builder = "";
@@ -269,6 +269,6 @@ var TypeScript;
         return builder;
     }
     TypeScript1.flagsToString = flagsToString;
-    TypeScript1.ErrorRecoverySet = ErrorRecoverySet1, TypeScript1.AllowedElements = AllowedElements1, TypeScript1.Modifiers = Modifiers1, TypeScript1.ASTFlags = ASTFlags1, TypeScript1.DeclFlags = DeclFlags1, TypeScript1.ModuleFlags = ModuleFlags1, TypeScript1.SymbolFlags = SymbolFlags1, TypeScript1.VarFlags = VarFlags1, TypeScript1.FncFlags = FncFlags1, TypeScript1.SignatureFlags = SignatureFlags1, TypeScript1.TypeFlags = TypeFlags1, TypeScript1.TypeRelationshipFlags = TypeRelationshipFlags1, TypeScript1.CodeGenTarget = CodeGenTarget1, TypeScript1.ModuleGenTarget = ModuleGenTarget1;
+    TypeScript1.ErrorRecoverySet = ErrorRecoverySet, TypeScript1.AllowedElements = AllowedElements, TypeScript1.Modifiers = Modifiers, TypeScript1.ASTFlags = ASTFlags, TypeScript1.DeclFlags = DeclFlags, TypeScript1.ModuleFlags = ModuleFlags, TypeScript1.SymbolFlags = SymbolFlags, TypeScript1.VarFlags = VarFlags, TypeScript1.FncFlags = FncFlags, TypeScript1.SignatureFlags = SignatureFlags, TypeScript1.TypeFlags = TypeFlags, TypeScript1.TypeRelationshipFlags = TypeRelationshipFlags, TypeScript1.CodeGenTarget = CodeGenTarget, TypeScript1.ModuleGenTarget = ModuleGenTarget;
 })(TypeScript || (TypeScript = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es2015.2.minified/output.js
index 1414caa3f4d..9555c5cbc82 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es2015.2.minified/output.js
@@ -1,25 +1,53 @@
 var TypeScript;
 !function(TypeScript1) {
-    var ErrorRecoverySet, AllowedElements, Modifiers, ASTFlags, DeclFlags, ModuleFlags, SymbolFlags, VarFlags, FncFlags, SignatureFlags, TypeFlags, TypeRelationshipFlags, CodeGenTarget, ModuleGenTarget, ErrorRecoverySet1, AllowedElements1, Modifiers1, ASTFlags1, DeclFlags1, ModuleFlags1, SymbolFlags1, VarFlags1, FncFlags1, SignatureFlags1, TypeFlags1, TypeRelationshipFlags1, CodeGenTarget1, ModuleGenTarget1;
+    var ErrorRecoverySet, AllowedElements, Modifiers, ASTFlags, DeclFlags, ModuleFlags, SymbolFlags, VarFlags, FncFlags, SignatureFlags, TypeFlags, TypeRelationshipFlags, CodeGenTarget, ModuleGenTarget;
     TypeScript1.hasFlag = function(val, flag) {
         return (val & flag) != 0;
-    }, (ErrorRecoverySet1 = ErrorRecoverySet || (ErrorRecoverySet = {
-    }))[ErrorRecoverySet1.None = 0] = "None", ErrorRecoverySet1[ErrorRecoverySet1.Comma = 1] = "Comma", ErrorRecoverySet1[ErrorRecoverySet1.SColon = 2] = "SColon", ErrorRecoverySet1[ErrorRecoverySet1.Asg = 4] = "Asg", ErrorRecoverySet1[ErrorRecoverySet1.BinOp = 8] = "BinOp", ErrorRecoverySet1[ErrorRecoverySet1.RBrack = 16] = "RBrack", ErrorRecoverySet1[ErrorRecoverySet1.RCurly = 32] = "RCurly", ErrorRecoverySet1[ErrorRecoverySet1.RParen = 64] = "RParen", ErrorRecoverySet1[ErrorRecoverySet1.Dot = 128] = "Dot", ErrorRecoverySet1[ErrorRecoverySet1.Colon = 256] = "Colon", ErrorRecoverySet1[ErrorRecoverySet1.PrimType = 512] = "PrimType", ErrorRecoverySet1[ErrorRecoverySet1.AddOp = 1024] = "AddOp", ErrorRecoverySet1[ErrorRecoverySet1.LCurly = 2048] = "LCurly", ErrorRecoverySet1[ErrorRecoverySet1.PreOp = 4096] = "PreOp", ErrorRecoverySet1[ErrorRecoverySet1.RegExp = 8192] = "RegExp", ErrorRecoverySet1[ErrorRecoverySet1.LParen = 16384] = "LParen", ErrorRecoverySet1[ErrorRecoverySet1.LBrack = 32768] = "LBrack", ErrorRecoverySet1[ErrorRecoverySet1.Scope = 65536] = "Scope", ErrorRecoverySet1[ErrorRecoverySet1.In = 131072] = "In", ErrorRecoverySet1[ErrorRecoverySet1.SCase = 262144] = "SCase", ErrorRecoverySet1[ErrorRecoverySet1.Else = 524288] = "Else", ErrorRecoverySet1[ErrorRecoverySet1.Catch = 1048576] = "Catch", ErrorRecoverySet1[ErrorRecoverySet1.Var = 2097152] = "Var", ErrorRecoverySet1[ErrorRecoverySet1.Stmt = 4194304] = "Stmt", ErrorRecoverySet1[ErrorRecoverySet1.While = 8388608] = "While", ErrorRecoverySet1[ErrorRecoverySet1.ID = 16777216] = "ID", ErrorRecoverySet1[ErrorRecoverySet1.Prefix = 33554432] = "Prefix", ErrorRecoverySet1[ErrorRecoverySet1.Literal = 67108864] = "Literal", ErrorRecoverySet1[ErrorRecoverySet1.RLit = 134217728] = "RLit", ErrorRecoverySet1[ErrorRecoverySet1.Func = 268435456] = "Func", ErrorRecoverySet1[ErrorRecoverySet1.EOF = 536870912] = "EOF", ErrorRecoverySet1[ErrorRecoverySet1.TypeScriptS = 1073741824] = "TypeScriptS", ErrorRecoverySet1[ErrorRecoverySet1.ExprStart = 520158210] = "ExprStart", ErrorRecoverySet1[ErrorRecoverySet1.StmtStart = 1608580098] = "StmtStart", ErrorRecoverySet1[ErrorRecoverySet1.Postfix = 49280] = "Postfix", (AllowedElements1 = AllowedElements || (AllowedElements = {
-    }))[AllowedElements1.None = 0] = "None", AllowedElements1[AllowedElements1.ModuleDeclarations = 4] = "ModuleDeclarations", AllowedElements1[AllowedElements1.ClassDeclarations = 8] = "ClassDeclarations", AllowedElements1[AllowedElements1.InterfaceDeclarations = 16] = "InterfaceDeclarations", AllowedElements1[AllowedElements1.AmbientDeclarations = 1024] = "AmbientDeclarations", AllowedElements1[AllowedElements1.Properties = 2048] = "Properties", AllowedElements1[AllowedElements1.Global = 1052] = "Global", AllowedElements1[AllowedElements1.QuickParse = 3100] = "QuickParse", (Modifiers1 = Modifiers || (Modifiers = {
-    }))[Modifiers1.None = 0] = "None", Modifiers1[Modifiers1.Private = 1] = "Private", Modifiers1[Modifiers1.Public = 2] = "Public", Modifiers1[Modifiers1.Readonly = 4] = "Readonly", Modifiers1[Modifiers1.Ambient = 8] = "Ambient", Modifiers1[Modifiers1.Exported = 16] = "Exported", Modifiers1[Modifiers1.Getter = 32] = "Getter", Modifiers1[Modifiers1.Setter = 64] = "Setter", Modifiers1[Modifiers1.Static = 128] = "Static", (ASTFlags1 = ASTFlags || (ASTFlags = {
-    }))[ASTFlags1.None = 0] = "None", ASTFlags1[ASTFlags1.ExplicitSemicolon = 1] = "ExplicitSemicolon", ASTFlags1[ASTFlags1.AutomaticSemicolon = 2] = "AutomaticSemicolon", ASTFlags1[ASTFlags1.Writeable = 4] = "Writeable", ASTFlags1[ASTFlags1.Error = 8] = "Error", ASTFlags1[ASTFlags1.DotLHSPartial = 16] = "DotLHSPartial", ASTFlags1[ASTFlags1.DotLHS = 32] = "DotLHS", ASTFlags1[ASTFlags1.IsStatement = 64] = "IsStatement", ASTFlags1[ASTFlags1.StrictMode = 128] = "StrictMode", ASTFlags1[ASTFlags1.PossibleOptionalParameter = 256] = "PossibleOptionalParameter", ASTFlags1[ASTFlags1.ClassBaseConstructorCall = 512] = "ClassBaseConstructorCall", ASTFlags1[ASTFlags1.OptionalName = 1024] = "OptionalName", ASTFlags1[ASTFlags1.SkipNextRParen = 2048] = "SkipNextRParen", (DeclFlags1 = DeclFlags || (DeclFlags = {
-    }))[DeclFlags1.None = 0] = "None", DeclFlags1[DeclFlags1.Exported = 1] = "Exported", DeclFlags1[DeclFlags1.Private = 2] = "Private", DeclFlags1[DeclFlags1.Public = 4] = "Public", DeclFlags1[DeclFlags1.Ambient = 8] = "Ambient", DeclFlags1[DeclFlags1.Static = 16] = "Static", DeclFlags1[DeclFlags1.LocalStatic = 32] = "LocalStatic", DeclFlags1[DeclFlags1.GetAccessor = 64] = "GetAccessor", DeclFlags1[DeclFlags1.SetAccessor = 128] = "SetAccessor", (ModuleFlags1 = ModuleFlags || (ModuleFlags = {
-    }))[ModuleFlags1.None = 0] = "None", ModuleFlags1[ModuleFlags1.Exported = 1] = "Exported", ModuleFlags1[ModuleFlags1.Private = 2] = "Private", ModuleFlags1[ModuleFlags1.Public = 4] = "Public", ModuleFlags1[ModuleFlags1.Ambient = 8] = "Ambient", ModuleFlags1[ModuleFlags1.Static = 16] = "Static", ModuleFlags1[ModuleFlags1.LocalStatic = 32] = "LocalStatic", ModuleFlags1[ModuleFlags1.GetAccessor = 64] = "GetAccessor", ModuleFlags1[ModuleFlags1.SetAccessor = 128] = "SetAccessor", ModuleFlags1[ModuleFlags1.IsEnum = 256] = "IsEnum", ModuleFlags1[ModuleFlags1.ShouldEmitModuleDecl = 512] = "ShouldEmitModuleDecl", ModuleFlags1[ModuleFlags1.IsWholeFile = 1024] = "IsWholeFile", ModuleFlags1[ModuleFlags1.IsDynamic = 2048] = "IsDynamic", ModuleFlags1[ModuleFlags1.MustCaptureThis = 4096] = "MustCaptureThis", (SymbolFlags1 = SymbolFlags || (SymbolFlags = {
-    }))[SymbolFlags1.None = 0] = "None", SymbolFlags1[SymbolFlags1.Exported = 1] = "Exported", SymbolFlags1[SymbolFlags1.Private = 2] = "Private", SymbolFlags1[SymbolFlags1.Public = 4] = "Public", SymbolFlags1[SymbolFlags1.Ambient = 8] = "Ambient", SymbolFlags1[SymbolFlags1.Static = 16] = "Static", SymbolFlags1[SymbolFlags1.LocalStatic = 32] = "LocalStatic", SymbolFlags1[SymbolFlags1.GetAccessor = 64] = "GetAccessor", SymbolFlags1[SymbolFlags1.SetAccessor = 128] = "SetAccessor", SymbolFlags1[SymbolFlags1.Property = 256] = "Property", SymbolFlags1[SymbolFlags1.Readonly = 512] = "Readonly", SymbolFlags1[SymbolFlags1.ModuleMember = 1024] = "ModuleMember", SymbolFlags1[SymbolFlags1.InterfaceMember = 2048] = "InterfaceMember", SymbolFlags1[SymbolFlags1.ClassMember = 4096] = "ClassMember", SymbolFlags1[SymbolFlags1.BuiltIn = 8192] = "BuiltIn", SymbolFlags1[SymbolFlags1.TypeSetDuringScopeAssignment = 16384] = "TypeSetDuringScopeAssignment", SymbolFlags1[SymbolFlags1.Constant = 32768] = "Constant", SymbolFlags1[SymbolFlags1.Optional = 65536] = "Optional", SymbolFlags1[SymbolFlags1.RecursivelyReferenced = 131072] = "RecursivelyReferenced", SymbolFlags1[SymbolFlags1.Bound = 262144] = "Bound", SymbolFlags1[SymbolFlags1.CompilerGenerated = 524288] = "CompilerGenerated", (VarFlags1 = VarFlags || (VarFlags = {
-    }))[VarFlags1.None = 0] = "None", VarFlags1[VarFlags1.Exported = 1] = "Exported", VarFlags1[VarFlags1.Private = 2] = "Private", VarFlags1[VarFlags1.Public = 4] = "Public", VarFlags1[VarFlags1.Ambient = 8] = "Ambient", VarFlags1[VarFlags1.Static = 16] = "Static", VarFlags1[VarFlags1.LocalStatic = 32] = "LocalStatic", VarFlags1[VarFlags1.GetAccessor = 64] = "GetAccessor", VarFlags1[VarFlags1.SetAccessor = 128] = "SetAccessor", VarFlags1[VarFlags1.AutoInit = 256] = "AutoInit", VarFlags1[VarFlags1.Property = 512] = "Property", VarFlags1[VarFlags1.Readonly = 1024] = "Readonly", VarFlags1[VarFlags1.Class = 2048] = "Class", VarFlags1[VarFlags1.ClassProperty = 4096] = "ClassProperty", VarFlags1[VarFlags1.ClassBodyProperty = 8192] = "ClassBodyProperty", VarFlags1[VarFlags1.ClassConstructorProperty = 16384] = "ClassConstructorProperty", VarFlags1[VarFlags1.ClassSuperMustBeFirstCallInConstructor = 32768] = "ClassSuperMustBeFirstCallInConstructor", VarFlags1[VarFlags1.Constant = 65536] = "Constant", VarFlags1[VarFlags1.MustCaptureThis = 131072] = "MustCaptureThis", (FncFlags1 = FncFlags || (FncFlags = {
-    }))[FncFlags1.None = 0] = "None", FncFlags1[FncFlags1.Exported = 1] = "Exported", FncFlags1[FncFlags1.Private = 2] = "Private", FncFlags1[FncFlags1.Public = 4] = "Public", FncFlags1[FncFlags1.Ambient = 8] = "Ambient", FncFlags1[FncFlags1.Static = 16] = "Static", FncFlags1[FncFlags1.LocalStatic = 32] = "LocalStatic", FncFlags1[FncFlags1.GetAccessor = 64] = "GetAccessor", FncFlags1[FncFlags1.SetAccessor = 128] = "SetAccessor", FncFlags1[FncFlags1.Definition = 256] = "Definition", FncFlags1[FncFlags1.Signature = 512] = "Signature", FncFlags1[FncFlags1.Method = 1024] = "Method", FncFlags1[FncFlags1.HasReturnExpression = 2048] = "HasReturnExpression", FncFlags1[FncFlags1.CallMember = 4096] = "CallMember", FncFlags1[FncFlags1.ConstructMember = 8192] = "ConstructMember", FncFlags1[FncFlags1.HasSelfReference = 16384] = "HasSelfReference", FncFlags1[FncFlags1.IsFatArrowFunction = 32768] = "IsFatArrowFunction", FncFlags1[FncFlags1.IndexerMember = 65536] = "IndexerMember", FncFlags1[FncFlags1.IsFunctionExpression = 131072] = "IsFunctionExpression", FncFlags1[FncFlags1.ClassMethod = 262144] = "ClassMethod", FncFlags1[FncFlags1.ClassPropertyMethodExported = 524288] = "ClassPropertyMethodExported", (SignatureFlags1 = SignatureFlags || (SignatureFlags = {
-    }))[SignatureFlags1.None = 0] = "None", SignatureFlags1[SignatureFlags1.IsIndexer = 1] = "IsIndexer", SignatureFlags1[SignatureFlags1.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags1[SignatureFlags1.IsNumberIndexer = 4] = "IsNumberIndexer", TypeScript1.ToDeclFlags = function(fncOrVarOrSymbolOrModuleFlags) {
+    };
+    let ErrorRecoverySet;
+    (ErrorRecoverySet = ErrorRecoverySet || (ErrorRecoverySet = {
+    }))[ErrorRecoverySet.None = 0] = "None", ErrorRecoverySet[ErrorRecoverySet.Comma = 1] = "Comma", ErrorRecoverySet[ErrorRecoverySet.SColon = 2] = "SColon", ErrorRecoverySet[ErrorRecoverySet.Asg = 4] = "Asg", ErrorRecoverySet[ErrorRecoverySet.BinOp = 8] = "BinOp", ErrorRecoverySet[ErrorRecoverySet.RBrack = 16] = "RBrack", ErrorRecoverySet[ErrorRecoverySet.RCurly = 32] = "RCurly", ErrorRecoverySet[ErrorRecoverySet.RParen = 64] = "RParen", ErrorRecoverySet[ErrorRecoverySet.Dot = 128] = "Dot", ErrorRecoverySet[ErrorRecoverySet.Colon = 256] = "Colon", ErrorRecoverySet[ErrorRecoverySet.PrimType = 512] = "PrimType", ErrorRecoverySet[ErrorRecoverySet.AddOp = 1024] = "AddOp", ErrorRecoverySet[ErrorRecoverySet.LCurly = 2048] = "LCurly", ErrorRecoverySet[ErrorRecoverySet.PreOp = 4096] = "PreOp", ErrorRecoverySet[ErrorRecoverySet.RegExp = 8192] = "RegExp", ErrorRecoverySet[ErrorRecoverySet.LParen = 16384] = "LParen", ErrorRecoverySet[ErrorRecoverySet.LBrack = 32768] = "LBrack", ErrorRecoverySet[ErrorRecoverySet.Scope = 65536] = "Scope", ErrorRecoverySet[ErrorRecoverySet.In = 131072] = "In", ErrorRecoverySet[ErrorRecoverySet.SCase = 262144] = "SCase", ErrorRecoverySet[ErrorRecoverySet.Else = 524288] = "Else", ErrorRecoverySet[ErrorRecoverySet.Catch = 1048576] = "Catch", ErrorRecoverySet[ErrorRecoverySet.Var = 2097152] = "Var", ErrorRecoverySet[ErrorRecoverySet.Stmt = 4194304] = "Stmt", ErrorRecoverySet[ErrorRecoverySet.While = 8388608] = "While", ErrorRecoverySet[ErrorRecoverySet.ID = 16777216] = "ID", ErrorRecoverySet[ErrorRecoverySet.Prefix = 33554432] = "Prefix", ErrorRecoverySet[ErrorRecoverySet.Literal = 67108864] = "Literal", ErrorRecoverySet[ErrorRecoverySet.RLit = 134217728] = "RLit", ErrorRecoverySet[ErrorRecoverySet.Func = 268435456] = "Func", ErrorRecoverySet[ErrorRecoverySet.EOF = 536870912] = "EOF", ErrorRecoverySet[ErrorRecoverySet.TypeScriptS = 1073741824] = "TypeScriptS", ErrorRecoverySet[ErrorRecoverySet.ExprStart = 520158210] = "ExprStart", ErrorRecoverySet[ErrorRecoverySet.StmtStart = 1608580098] = "StmtStart", ErrorRecoverySet[ErrorRecoverySet.Postfix = 49280] = "Postfix";
+    let AllowedElements;
+    (AllowedElements = AllowedElements || (AllowedElements = {
+    }))[AllowedElements.None = 0] = "None", AllowedElements[AllowedElements.ModuleDeclarations = 4] = "ModuleDeclarations", AllowedElements[AllowedElements.ClassDeclarations = 8] = "ClassDeclarations", AllowedElements[AllowedElements.InterfaceDeclarations = 16] = "InterfaceDeclarations", AllowedElements[AllowedElements.AmbientDeclarations = 1024] = "AmbientDeclarations", AllowedElements[AllowedElements.Properties = 2048] = "Properties", AllowedElements[AllowedElements.Global = 1052] = "Global", AllowedElements[AllowedElements.QuickParse = 3100] = "QuickParse";
+    let Modifiers;
+    (Modifiers = Modifiers || (Modifiers = {
+    }))[Modifiers.None = 0] = "None", Modifiers[Modifiers.Private = 1] = "Private", Modifiers[Modifiers.Public = 2] = "Public", Modifiers[Modifiers.Readonly = 4] = "Readonly", Modifiers[Modifiers.Ambient = 8] = "Ambient", Modifiers[Modifiers.Exported = 16] = "Exported", Modifiers[Modifiers.Getter = 32] = "Getter", Modifiers[Modifiers.Setter = 64] = "Setter", Modifiers[Modifiers.Static = 128] = "Static";
+    let ASTFlags;
+    (ASTFlags = ASTFlags || (ASTFlags = {
+    }))[ASTFlags.None = 0] = "None", ASTFlags[ASTFlags.ExplicitSemicolon = 1] = "ExplicitSemicolon", ASTFlags[ASTFlags.AutomaticSemicolon = 2] = "AutomaticSemicolon", ASTFlags[ASTFlags.Writeable = 4] = "Writeable", ASTFlags[ASTFlags.Error = 8] = "Error", ASTFlags[ASTFlags.DotLHSPartial = 16] = "DotLHSPartial", ASTFlags[ASTFlags.DotLHS = 32] = "DotLHS", ASTFlags[ASTFlags.IsStatement = 64] = "IsStatement", ASTFlags[ASTFlags.StrictMode = 128] = "StrictMode", ASTFlags[ASTFlags.PossibleOptionalParameter = 256] = "PossibleOptionalParameter", ASTFlags[ASTFlags.ClassBaseConstructorCall = 512] = "ClassBaseConstructorCall", ASTFlags[ASTFlags.OptionalName = 1024] = "OptionalName", ASTFlags[ASTFlags.SkipNextRParen = 2048] = "SkipNextRParen";
+    let DeclFlags;
+    (DeclFlags = DeclFlags || (DeclFlags = {
+    }))[DeclFlags.None = 0] = "None", DeclFlags[DeclFlags.Exported = 1] = "Exported", DeclFlags[DeclFlags.Private = 2] = "Private", DeclFlags[DeclFlags.Public = 4] = "Public", DeclFlags[DeclFlags.Ambient = 8] = "Ambient", DeclFlags[DeclFlags.Static = 16] = "Static", DeclFlags[DeclFlags.LocalStatic = 32] = "LocalStatic", DeclFlags[DeclFlags.GetAccessor = 64] = "GetAccessor", DeclFlags[DeclFlags.SetAccessor = 128] = "SetAccessor";
+    let ModuleFlags;
+    (ModuleFlags = ModuleFlags || (ModuleFlags = {
+    }))[ModuleFlags.None = 0] = "None", ModuleFlags[ModuleFlags.Exported = 1] = "Exported", ModuleFlags[ModuleFlags.Private = 2] = "Private", ModuleFlags[ModuleFlags.Public = 4] = "Public", ModuleFlags[ModuleFlags.Ambient = 8] = "Ambient", ModuleFlags[ModuleFlags.Static = 16] = "Static", ModuleFlags[ModuleFlags.LocalStatic = 32] = "LocalStatic", ModuleFlags[ModuleFlags.GetAccessor = 64] = "GetAccessor", ModuleFlags[ModuleFlags.SetAccessor = 128] = "SetAccessor", ModuleFlags[ModuleFlags.IsEnum = 256] = "IsEnum", ModuleFlags[ModuleFlags.ShouldEmitModuleDecl = 512] = "ShouldEmitModuleDecl", ModuleFlags[ModuleFlags.IsWholeFile = 1024] = "IsWholeFile", ModuleFlags[ModuleFlags.IsDynamic = 2048] = "IsDynamic", ModuleFlags[ModuleFlags.MustCaptureThis = 4096] = "MustCaptureThis";
+    let SymbolFlags;
+    (SymbolFlags = SymbolFlags || (SymbolFlags = {
+    }))[SymbolFlags.None = 0] = "None", SymbolFlags[SymbolFlags.Exported = 1] = "Exported", SymbolFlags[SymbolFlags.Private = 2] = "Private", SymbolFlags[SymbolFlags.Public = 4] = "Public", SymbolFlags[SymbolFlags.Ambient = 8] = "Ambient", SymbolFlags[SymbolFlags.Static = 16] = "Static", SymbolFlags[SymbolFlags.LocalStatic = 32] = "LocalStatic", SymbolFlags[SymbolFlags.GetAccessor = 64] = "GetAccessor", SymbolFlags[SymbolFlags.SetAccessor = 128] = "SetAccessor", SymbolFlags[SymbolFlags.Property = 256] = "Property", SymbolFlags[SymbolFlags.Readonly = 512] = "Readonly", SymbolFlags[SymbolFlags.ModuleMember = 1024] = "ModuleMember", SymbolFlags[SymbolFlags.InterfaceMember = 2048] = "InterfaceMember", SymbolFlags[SymbolFlags.ClassMember = 4096] = "ClassMember", SymbolFlags[SymbolFlags.BuiltIn = 8192] = "BuiltIn", SymbolFlags[SymbolFlags.TypeSetDuringScopeAssignment = 16384] = "TypeSetDuringScopeAssignment", SymbolFlags[SymbolFlags.Constant = 32768] = "Constant", SymbolFlags[SymbolFlags.Optional = 65536] = "Optional", SymbolFlags[SymbolFlags.RecursivelyReferenced = 131072] = "RecursivelyReferenced", SymbolFlags[SymbolFlags.Bound = 262144] = "Bound", SymbolFlags[SymbolFlags.CompilerGenerated = 524288] = "CompilerGenerated";
+    let VarFlags;
+    (VarFlags = VarFlags || (VarFlags = {
+    }))[VarFlags.None = 0] = "None", VarFlags[VarFlags.Exported = 1] = "Exported", VarFlags[VarFlags.Private = 2] = "Private", VarFlags[VarFlags.Public = 4] = "Public", VarFlags[VarFlags.Ambient = 8] = "Ambient", VarFlags[VarFlags.Static = 16] = "Static", VarFlags[VarFlags.LocalStatic = 32] = "LocalStatic", VarFlags[VarFlags.GetAccessor = 64] = "GetAccessor", VarFlags[VarFlags.SetAccessor = 128] = "SetAccessor", VarFlags[VarFlags.AutoInit = 256] = "AutoInit", VarFlags[VarFlags.Property = 512] = "Property", VarFlags[VarFlags.Readonly = 1024] = "Readonly", VarFlags[VarFlags.Class = 2048] = "Class", VarFlags[VarFlags.ClassProperty = 4096] = "ClassProperty", VarFlags[VarFlags.ClassBodyProperty = 8192] = "ClassBodyProperty", VarFlags[VarFlags.ClassConstructorProperty = 16384] = "ClassConstructorProperty", VarFlags[VarFlags.ClassSuperMustBeFirstCallInConstructor = 32768] = "ClassSuperMustBeFirstCallInConstructor", VarFlags[VarFlags.Constant = 65536] = "Constant", VarFlags[VarFlags.MustCaptureThis = 131072] = "MustCaptureThis";
+    let FncFlags;
+    (FncFlags = FncFlags || (FncFlags = {
+    }))[FncFlags.None = 0] = "None", FncFlags[FncFlags.Exported = 1] = "Exported", FncFlags[FncFlags.Private = 2] = "Private", FncFlags[FncFlags.Public = 4] = "Public", FncFlags[FncFlags.Ambient = 8] = "Ambient", FncFlags[FncFlags.Static = 16] = "Static", FncFlags[FncFlags.LocalStatic = 32] = "LocalStatic", FncFlags[FncFlags.GetAccessor = 64] = "GetAccessor", FncFlags[FncFlags.SetAccessor = 128] = "SetAccessor", FncFlags[FncFlags.Definition = 256] = "Definition", FncFlags[FncFlags.Signature = 512] = "Signature", FncFlags[FncFlags.Method = 1024] = "Method", FncFlags[FncFlags.HasReturnExpression = 2048] = "HasReturnExpression", FncFlags[FncFlags.CallMember = 4096] = "CallMember", FncFlags[FncFlags.ConstructMember = 8192] = "ConstructMember", FncFlags[FncFlags.HasSelfReference = 16384] = "HasSelfReference", FncFlags[FncFlags.IsFatArrowFunction = 32768] = "IsFatArrowFunction", FncFlags[FncFlags.IndexerMember = 65536] = "IndexerMember", FncFlags[FncFlags.IsFunctionExpression = 131072] = "IsFunctionExpression", FncFlags[FncFlags.ClassMethod = 262144] = "ClassMethod", FncFlags[FncFlags.ClassPropertyMethodExported = 524288] = "ClassPropertyMethodExported";
+    let SignatureFlags;
+    (SignatureFlags = SignatureFlags || (SignatureFlags = {
+    }))[SignatureFlags.None = 0] = "None", SignatureFlags[SignatureFlags.IsIndexer = 1] = "IsIndexer", SignatureFlags[SignatureFlags.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags[SignatureFlags.IsNumberIndexer = 4] = "IsNumberIndexer", TypeScript1.ToDeclFlags = function(fncOrVarOrSymbolOrModuleFlags) {
         return fncOrVarOrSymbolOrModuleFlags;
-    }, (TypeFlags1 = TypeFlags || (TypeFlags = {
-    }))[TypeFlags1.None = 0] = "None", TypeFlags1[TypeFlags1.HasImplementation = 1] = "HasImplementation", TypeFlags1[TypeFlags1.HasSelfReference = 2] = "HasSelfReference", TypeFlags1[TypeFlags1.MergeResult = 4] = "MergeResult", TypeFlags1[TypeFlags1.IsEnum = 8] = "IsEnum", TypeFlags1[TypeFlags1.BuildingName = 16] = "BuildingName", TypeFlags1[TypeFlags1.HasBaseType = 32] = "HasBaseType", TypeFlags1[TypeFlags1.HasBaseTypeOfObject = 64] = "HasBaseTypeOfObject", TypeFlags1[TypeFlags1.IsClass = 128] = "IsClass", (TypeRelationshipFlags1 = TypeRelationshipFlags || (TypeRelationshipFlags = {
-    }))[TypeRelationshipFlags1.SuccessfulComparison = 0] = "SuccessfulComparison", TypeRelationshipFlags1[TypeRelationshipFlags1.SourceIsNullTargetIsVoidOrUndefined = 1] = "SourceIsNullTargetIsVoidOrUndefined", TypeRelationshipFlags1[TypeRelationshipFlags1.RequiredPropertyIsMissing = 2] = "RequiredPropertyIsMissing", TypeRelationshipFlags1[TypeRelationshipFlags1.IncompatibleSignatures = 4] = "IncompatibleSignatures", TypeRelationshipFlags1[TypeRelationshipFlags1.SourceSignatureHasTooManyParameters = 3] = "SourceSignatureHasTooManyParameters", TypeRelationshipFlags1[TypeRelationshipFlags1.IncompatibleReturnTypes = 16] = "IncompatibleReturnTypes", TypeRelationshipFlags1[TypeRelationshipFlags1.IncompatiblePropertyTypes = 32] = "IncompatiblePropertyTypes", TypeRelationshipFlags1[TypeRelationshipFlags1.IncompatibleParameterTypes = 64] = "IncompatibleParameterTypes", (CodeGenTarget1 = CodeGenTarget || (CodeGenTarget = {
-    }))[CodeGenTarget1.ES3 = 0] = "ES3", CodeGenTarget1[CodeGenTarget1.ES5 = 1] = "ES5", (ModuleGenTarget1 = ModuleGenTarget || (ModuleGenTarget = {
-    }))[ModuleGenTarget1.Synchronous = 0] = "Synchronous", ModuleGenTarget1[ModuleGenTarget1.Asynchronous = 1] = "Asynchronous", ModuleGenTarget1[ModuleGenTarget1.Local = 2] = "Local", TypeScript1.codeGenTarget = CodeGenTarget.ES3, TypeScript1.moduleGenTarget = ModuleGenTarget.Synchronous, TypeScript1.optimizeModuleCodeGen = !0, TypeScript1.flagsToString = function(e, flags) {
+    };
+    let TypeFlags;
+    (TypeFlags = TypeFlags || (TypeFlags = {
+    }))[TypeFlags.None = 0] = "None", TypeFlags[TypeFlags.HasImplementation = 1] = "HasImplementation", TypeFlags[TypeFlags.HasSelfReference = 2] = "HasSelfReference", TypeFlags[TypeFlags.MergeResult = 4] = "MergeResult", TypeFlags[TypeFlags.IsEnum = 8] = "IsEnum", TypeFlags[TypeFlags.BuildingName = 16] = "BuildingName", TypeFlags[TypeFlags.HasBaseType = 32] = "HasBaseType", TypeFlags[TypeFlags.HasBaseTypeOfObject = 64] = "HasBaseTypeOfObject", TypeFlags[TypeFlags.IsClass = 128] = "IsClass";
+    let TypeRelationshipFlags;
+    (TypeRelationshipFlags = TypeRelationshipFlags || (TypeRelationshipFlags = {
+    }))[TypeRelationshipFlags.SuccessfulComparison = 0] = "SuccessfulComparison", TypeRelationshipFlags[TypeRelationshipFlags.SourceIsNullTargetIsVoidOrUndefined = 1] = "SourceIsNullTargetIsVoidOrUndefined", TypeRelationshipFlags[TypeRelationshipFlags.RequiredPropertyIsMissing = 2] = "RequiredPropertyIsMissing", TypeRelationshipFlags[TypeRelationshipFlags.IncompatibleSignatures = 4] = "IncompatibleSignatures", TypeRelationshipFlags[TypeRelationshipFlags.SourceSignatureHasTooManyParameters = 3] = "SourceSignatureHasTooManyParameters", TypeRelationshipFlags[TypeRelationshipFlags.IncompatibleReturnTypes = 16] = "IncompatibleReturnTypes", TypeRelationshipFlags[TypeRelationshipFlags.IncompatiblePropertyTypes = 32] = "IncompatiblePropertyTypes", TypeRelationshipFlags[TypeRelationshipFlags.IncompatibleParameterTypes = 64] = "IncompatibleParameterTypes";
+    let CodeGenTarget;
+    (CodeGenTarget = CodeGenTarget || (CodeGenTarget = {
+    }))[CodeGenTarget.ES3 = 0] = "ES3", CodeGenTarget[CodeGenTarget.ES5 = 1] = "ES5";
+    let ModuleGenTarget;
+    (ModuleGenTarget = ModuleGenTarget || (ModuleGenTarget = {
+    }))[ModuleGenTarget.Synchronous = 0] = "Synchronous", ModuleGenTarget[ModuleGenTarget.Asynchronous = 1] = "Asynchronous", ModuleGenTarget[ModuleGenTarget.Local = 2] = "Local", TypeScript1.codeGenTarget = CodeGenTarget.ES3, TypeScript1.moduleGenTarget = ModuleGenTarget.Synchronous, TypeScript1.optimizeModuleCodeGen = !0, TypeScript1.flagsToString = function(e, flags) {
         for(var builder = "", i = 1; i < -2147483648; i <<= 1)if ((flags & i) != 0) {
             for(var k in e)if (e[k] == i) {
                 builder.length > 0 && (builder += "|"), builder += k;
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es5.1.normal/output.js
index ee4aeffe400..5d0e640889e 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es5.1.normal/output.js
@@ -27,7 +27,7 @@ var TypeScript;
         return builder;
     };
     TypeScript1.hasFlag = hasFlag;
-    var ErrorRecoverySet1;
+    var ErrorRecoverySet;
     (function(ErrorRecoverySet) {
         ErrorRecoverySet[ErrorRecoverySet["None"] = 0] = "None";
         ErrorRecoverySet[ErrorRecoverySet["Comma"] = 1] = "Comma";
@@ -67,9 +67,9 @@ var TypeScript;
         ErrorRecoverySet[ErrorRecoverySet["ExprStart"] = 520158210] = "ExprStart";
         ErrorRecoverySet[ErrorRecoverySet["StmtStart"] = 1608580098] = "StmtStart";
         ErrorRecoverySet[ErrorRecoverySet["Postfix"] = 49280] = "Postfix";
-    })(ErrorRecoverySet1 || (ErrorRecoverySet1 = {
+    })(ErrorRecoverySet || (ErrorRecoverySet = {
     }));
-    var AllowedElements1;
+    var AllowedElements;
     (function(AllowedElements) {
         AllowedElements[AllowedElements["None"] = 0] = "None";
         AllowedElements[AllowedElements["ModuleDeclarations"] = 4] = "ModuleDeclarations";
@@ -79,9 +79,9 @@ var TypeScript;
         AllowedElements[AllowedElements["Properties"] = 2048] = "Properties";
         AllowedElements[AllowedElements["Global"] = 1052] = "Global";
         AllowedElements[AllowedElements["QuickParse"] = 3100] = "QuickParse";
-    })(AllowedElements1 || (AllowedElements1 = {
+    })(AllowedElements || (AllowedElements = {
     }));
-    var Modifiers1;
+    var Modifiers;
     (function(Modifiers) {
         Modifiers[Modifiers["None"] = 0] = "None";
         Modifiers[Modifiers["Private"] = 1] = "Private";
@@ -92,9 +92,9 @@ var TypeScript;
         Modifiers[Modifiers["Getter"] = 32] = "Getter";
         Modifiers[Modifiers["Setter"] = 64] = "Setter";
         Modifiers[Modifiers["Static"] = 128] = "Static";
-    })(Modifiers1 || (Modifiers1 = {
+    })(Modifiers || (Modifiers = {
     }));
-    var ASTFlags1;
+    var ASTFlags;
     (function(ASTFlags) {
         ASTFlags[ASTFlags["None"] = 0] = "None";
         ASTFlags[ASTFlags["ExplicitSemicolon"] = 1] = "ExplicitSemicolon";
@@ -112,9 +112,9 @@ var TypeScript;
         //         The flag is used to communicate this piece of information to the calling parseTerm, which intern will remove it.
         //         Once we have a better way to associate information with nodes, this flag should not be used.
         "SkipNextRParen"] = 2048] = "SkipNextRParen";
-    })(ASTFlags1 || (ASTFlags1 = {
+    })(ASTFlags || (ASTFlags = {
     }));
-    var DeclFlags1;
+    var DeclFlags;
     (function(DeclFlags) {
         DeclFlags[DeclFlags["None"] = 0] = "None";
         DeclFlags[DeclFlags["Exported"] = 1] = "Exported";
@@ -125,9 +125,9 @@ var TypeScript;
         DeclFlags[DeclFlags["LocalStatic"] = 32] = "LocalStatic";
         DeclFlags[DeclFlags["GetAccessor"] = 64] = "GetAccessor";
         DeclFlags[DeclFlags["SetAccessor"] = 128] = "SetAccessor";
-    })(DeclFlags1 || (DeclFlags1 = {
+    })(DeclFlags || (DeclFlags = {
     }));
-    var ModuleFlags1;
+    var ModuleFlags;
     (function(ModuleFlags) {
         ModuleFlags[ModuleFlags["None"] = 0] = "None";
         ModuleFlags[ModuleFlags["Exported"] = 1] = "Exported";
@@ -143,9 +143,9 @@ var TypeScript;
         ModuleFlags[ModuleFlags["IsWholeFile"] = 1024] = "IsWholeFile";
         ModuleFlags[ModuleFlags["IsDynamic"] = 2048] = "IsDynamic";
         ModuleFlags[ModuleFlags["MustCaptureThis"] = 4096] = "MustCaptureThis";
-    })(ModuleFlags1 || (ModuleFlags1 = {
+    })(ModuleFlags || (ModuleFlags = {
     }));
-    var SymbolFlags1;
+    var SymbolFlags;
     (function(SymbolFlags) {
         SymbolFlags[SymbolFlags["None"] = 0] = "None";
         SymbolFlags[SymbolFlags["Exported"] = 1] = "Exported";
@@ -168,9 +168,9 @@ var TypeScript;
         SymbolFlags[SymbolFlags["RecursivelyReferenced"] = 131072] = "RecursivelyReferenced";
         SymbolFlags[SymbolFlags["Bound"] = 262144] = "Bound";
         SymbolFlags[SymbolFlags["CompilerGenerated"] = 524288] = "CompilerGenerated";
-    })(SymbolFlags1 || (SymbolFlags1 = {
+    })(SymbolFlags || (SymbolFlags = {
     }));
-    var VarFlags1;
+    var VarFlags;
     (function(VarFlags) {
         VarFlags[VarFlags["None"] = 0] = "None";
         VarFlags[VarFlags["Exported"] = 1] = "Exported";
@@ -191,9 +191,9 @@ var TypeScript;
         VarFlags[VarFlags["ClassSuperMustBeFirstCallInConstructor"] = 32768] = "ClassSuperMustBeFirstCallInConstructor";
         VarFlags[VarFlags["Constant"] = 65536] = "Constant";
         VarFlags[VarFlags["MustCaptureThis"] = 131072] = "MustCaptureThis";
-    })(VarFlags1 || (VarFlags1 = {
+    })(VarFlags || (VarFlags = {
     }));
-    var FncFlags1;
+    var FncFlags;
     (function(FncFlags) {
         FncFlags[FncFlags["None"] = 0] = "None";
         FncFlags[FncFlags["Exported"] = 1] = "Exported";
@@ -216,18 +216,18 @@ var TypeScript;
         FncFlags[FncFlags["IsFunctionExpression"] = 131072] = "IsFunctionExpression";
         FncFlags[FncFlags["ClassMethod"] = 262144] = "ClassMethod";
         FncFlags[FncFlags["ClassPropertyMethodExported"] = 524288] = "ClassPropertyMethodExported";
-    })(FncFlags1 || (FncFlags1 = {
+    })(FncFlags || (FncFlags = {
     }));
-    var SignatureFlags1;
+    var SignatureFlags;
     (function(SignatureFlags) {
         SignatureFlags[SignatureFlags["None"] = 0] = "None";
         SignatureFlags[SignatureFlags["IsIndexer"] = 1] = "IsIndexer";
         SignatureFlags[SignatureFlags["IsStringIndexer"] = 2] = "IsStringIndexer";
         SignatureFlags[SignatureFlags["IsNumberIndexer"] = 4] = "IsNumberIndexer";
-    })(SignatureFlags1 || (SignatureFlags1 = {
+    })(SignatureFlags || (SignatureFlags = {
     }));
     TypeScript1.ToDeclFlags = ToDeclFlags;
-    var TypeFlags1;
+    var TypeFlags;
     (function(TypeFlags) {
         TypeFlags[TypeFlags["None"] = 0] = "None";
         TypeFlags[TypeFlags["HasImplementation"] = 1] = "HasImplementation";
@@ -238,9 +238,9 @@ var TypeScript;
         TypeFlags[TypeFlags["HasBaseType"] = 32] = "HasBaseType";
         TypeFlags[TypeFlags["HasBaseTypeOfObject"] = 64] = "HasBaseTypeOfObject";
         TypeFlags[TypeFlags["IsClass"] = 128] = "IsClass";
-    })(TypeFlags1 || (TypeFlags1 = {
+    })(TypeFlags || (TypeFlags = {
     }));
-    var TypeRelationshipFlags1;
+    var TypeRelationshipFlags;
     (function(TypeRelationshipFlags) {
         TypeRelationshipFlags[TypeRelationshipFlags["SuccessfulComparison"] = 0] = "SuccessfulComparison";
         TypeRelationshipFlags[TypeRelationshipFlags["SourceIsNullTargetIsVoidOrUndefined"] = 1] = "SourceIsNullTargetIsVoidOrUndefined";
@@ -250,25 +250,25 @@ var TypeScript;
         TypeRelationshipFlags[TypeRelationshipFlags["IncompatibleReturnTypes"] = 16] = "IncompatibleReturnTypes";
         TypeRelationshipFlags[TypeRelationshipFlags["IncompatiblePropertyTypes"] = 32] = "IncompatiblePropertyTypes";
         TypeRelationshipFlags[TypeRelationshipFlags["IncompatibleParameterTypes"] = 64] = "IncompatibleParameterTypes";
-    })(TypeRelationshipFlags1 || (TypeRelationshipFlags1 = {
+    })(TypeRelationshipFlags || (TypeRelationshipFlags = {
     }));
-    var CodeGenTarget1;
+    var CodeGenTarget;
     (function(CodeGenTarget) {
         CodeGenTarget[CodeGenTarget["ES3"] = 0] = "ES3";
         CodeGenTarget[CodeGenTarget["ES5"] = 1] = "ES5";
-    })(CodeGenTarget1 || (CodeGenTarget1 = {
+    })(CodeGenTarget || (CodeGenTarget = {
     }));
-    var ModuleGenTarget1;
+    var ModuleGenTarget;
     (function(ModuleGenTarget) {
         ModuleGenTarget[ModuleGenTarget["Synchronous"] = 0] = "Synchronous";
         ModuleGenTarget[ModuleGenTarget["Asynchronous"] = 1] = "Asynchronous";
         ModuleGenTarget[ModuleGenTarget["Local"] = 2] = "Local";
-    })(ModuleGenTarget1 || (ModuleGenTarget1 = {
+    })(ModuleGenTarget || (ModuleGenTarget = {
     }));
-    TypeScript1.codeGenTarget = CodeGenTarget1.ES3;
-    TypeScript1.moduleGenTarget = ModuleGenTarget1.Synchronous;
+    TypeScript1.codeGenTarget = CodeGenTarget.ES3;
+    TypeScript1.moduleGenTarget = ModuleGenTarget.Synchronous;
     TypeScript1.optimizeModuleCodeGen = true;
     TypeScript1.flagsToString = flagsToString;
-    TypeScript1.ErrorRecoverySet = ErrorRecoverySet1, TypeScript1.AllowedElements = AllowedElements1, TypeScript1.Modifiers = Modifiers1, TypeScript1.ASTFlags = ASTFlags1, TypeScript1.DeclFlags = DeclFlags1, TypeScript1.ModuleFlags = ModuleFlags1, TypeScript1.SymbolFlags = SymbolFlags1, TypeScript1.VarFlags = VarFlags1, TypeScript1.FncFlags = FncFlags1, TypeScript1.SignatureFlags = SignatureFlags1, TypeScript1.TypeFlags = TypeFlags1, TypeScript1.TypeRelationshipFlags = TypeRelationshipFlags1, TypeScript1.CodeGenTarget = CodeGenTarget1, TypeScript1.ModuleGenTarget = ModuleGenTarget1;
+    TypeScript1.ErrorRecoverySet = ErrorRecoverySet, TypeScript1.AllowedElements = AllowedElements, TypeScript1.Modifiers = Modifiers, TypeScript1.ASTFlags = ASTFlags, TypeScript1.DeclFlags = DeclFlags, TypeScript1.ModuleFlags = ModuleFlags, TypeScript1.SymbolFlags = SymbolFlags, TypeScript1.VarFlags = VarFlags, TypeScript1.FncFlags = FncFlags, TypeScript1.SignatureFlags = SignatureFlags, TypeScript1.TypeFlags = TypeFlags, TypeScript1.TypeRelationshipFlags = TypeRelationshipFlags, TypeScript1.CodeGenTarget = CodeGenTarget, TypeScript1.ModuleGenTarget = ModuleGenTarget;
 })(TypeScript || (TypeScript = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es5.2.minified/output.js
index 1414caa3f4d..a4da480ee46 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource2/input.ts/es5.2.minified/output.js
@@ -1,25 +1,25 @@
 var TypeScript;
 !function(TypeScript1) {
-    var ErrorRecoverySet, AllowedElements, Modifiers, ASTFlags, DeclFlags, ModuleFlags, SymbolFlags, VarFlags, FncFlags, SignatureFlags, TypeFlags, TypeRelationshipFlags, CodeGenTarget, ModuleGenTarget, ErrorRecoverySet1, AllowedElements1, Modifiers1, ASTFlags1, DeclFlags1, ModuleFlags1, SymbolFlags1, VarFlags1, FncFlags1, SignatureFlags1, TypeFlags1, TypeRelationshipFlags1, CodeGenTarget1, ModuleGenTarget1;
+    var ErrorRecoverySet, AllowedElements, Modifiers, ASTFlags, DeclFlags, ModuleFlags, SymbolFlags, VarFlags, FncFlags, SignatureFlags, TypeFlags, TypeRelationshipFlags, CodeGenTarget, ModuleGenTarget, ErrorRecoverySet, AllowedElements, Modifiers, ASTFlags, DeclFlags, ModuleFlags, SymbolFlags, VarFlags, FncFlags, SignatureFlags, TypeFlags, TypeRelationshipFlags, CodeGenTarget, ModuleGenTarget;
     TypeScript1.hasFlag = function(val, flag) {
         return (val & flag) != 0;
-    }, (ErrorRecoverySet1 = ErrorRecoverySet || (ErrorRecoverySet = {
-    }))[ErrorRecoverySet1.None = 0] = "None", ErrorRecoverySet1[ErrorRecoverySet1.Comma = 1] = "Comma", ErrorRecoverySet1[ErrorRecoverySet1.SColon = 2] = "SColon", ErrorRecoverySet1[ErrorRecoverySet1.Asg = 4] = "Asg", ErrorRecoverySet1[ErrorRecoverySet1.BinOp = 8] = "BinOp", ErrorRecoverySet1[ErrorRecoverySet1.RBrack = 16] = "RBrack", ErrorRecoverySet1[ErrorRecoverySet1.RCurly = 32] = "RCurly", ErrorRecoverySet1[ErrorRecoverySet1.RParen = 64] = "RParen", ErrorRecoverySet1[ErrorRecoverySet1.Dot = 128] = "Dot", ErrorRecoverySet1[ErrorRecoverySet1.Colon = 256] = "Colon", ErrorRecoverySet1[ErrorRecoverySet1.PrimType = 512] = "PrimType", ErrorRecoverySet1[ErrorRecoverySet1.AddOp = 1024] = "AddOp", ErrorRecoverySet1[ErrorRecoverySet1.LCurly = 2048] = "LCurly", ErrorRecoverySet1[ErrorRecoverySet1.PreOp = 4096] = "PreOp", ErrorRecoverySet1[ErrorRecoverySet1.RegExp = 8192] = "RegExp", ErrorRecoverySet1[ErrorRecoverySet1.LParen = 16384] = "LParen", ErrorRecoverySet1[ErrorRecoverySet1.LBrack = 32768] = "LBrack", ErrorRecoverySet1[ErrorRecoverySet1.Scope = 65536] = "Scope", ErrorRecoverySet1[ErrorRecoverySet1.In = 131072] = "In", ErrorRecoverySet1[ErrorRecoverySet1.SCase = 262144] = "SCase", ErrorRecoverySet1[ErrorRecoverySet1.Else = 524288] = "Else", ErrorRecoverySet1[ErrorRecoverySet1.Catch = 1048576] = "Catch", ErrorRecoverySet1[ErrorRecoverySet1.Var = 2097152] = "Var", ErrorRecoverySet1[ErrorRecoverySet1.Stmt = 4194304] = "Stmt", ErrorRecoverySet1[ErrorRecoverySet1.While = 8388608] = "While", ErrorRecoverySet1[ErrorRecoverySet1.ID = 16777216] = "ID", ErrorRecoverySet1[ErrorRecoverySet1.Prefix = 33554432] = "Prefix", ErrorRecoverySet1[ErrorRecoverySet1.Literal = 67108864] = "Literal", ErrorRecoverySet1[ErrorRecoverySet1.RLit = 134217728] = "RLit", ErrorRecoverySet1[ErrorRecoverySet1.Func = 268435456] = "Func", ErrorRecoverySet1[ErrorRecoverySet1.EOF = 536870912] = "EOF", ErrorRecoverySet1[ErrorRecoverySet1.TypeScriptS = 1073741824] = "TypeScriptS", ErrorRecoverySet1[ErrorRecoverySet1.ExprStart = 520158210] = "ExprStart", ErrorRecoverySet1[ErrorRecoverySet1.StmtStart = 1608580098] = "StmtStart", ErrorRecoverySet1[ErrorRecoverySet1.Postfix = 49280] = "Postfix", (AllowedElements1 = AllowedElements || (AllowedElements = {
-    }))[AllowedElements1.None = 0] = "None", AllowedElements1[AllowedElements1.ModuleDeclarations = 4] = "ModuleDeclarations", AllowedElements1[AllowedElements1.ClassDeclarations = 8] = "ClassDeclarations", AllowedElements1[AllowedElements1.InterfaceDeclarations = 16] = "InterfaceDeclarations", AllowedElements1[AllowedElements1.AmbientDeclarations = 1024] = "AmbientDeclarations", AllowedElements1[AllowedElements1.Properties = 2048] = "Properties", AllowedElements1[AllowedElements1.Global = 1052] = "Global", AllowedElements1[AllowedElements1.QuickParse = 3100] = "QuickParse", (Modifiers1 = Modifiers || (Modifiers = {
-    }))[Modifiers1.None = 0] = "None", Modifiers1[Modifiers1.Private = 1] = "Private", Modifiers1[Modifiers1.Public = 2] = "Public", Modifiers1[Modifiers1.Readonly = 4] = "Readonly", Modifiers1[Modifiers1.Ambient = 8] = "Ambient", Modifiers1[Modifiers1.Exported = 16] = "Exported", Modifiers1[Modifiers1.Getter = 32] = "Getter", Modifiers1[Modifiers1.Setter = 64] = "Setter", Modifiers1[Modifiers1.Static = 128] = "Static", (ASTFlags1 = ASTFlags || (ASTFlags = {
-    }))[ASTFlags1.None = 0] = "None", ASTFlags1[ASTFlags1.ExplicitSemicolon = 1] = "ExplicitSemicolon", ASTFlags1[ASTFlags1.AutomaticSemicolon = 2] = "AutomaticSemicolon", ASTFlags1[ASTFlags1.Writeable = 4] = "Writeable", ASTFlags1[ASTFlags1.Error = 8] = "Error", ASTFlags1[ASTFlags1.DotLHSPartial = 16] = "DotLHSPartial", ASTFlags1[ASTFlags1.DotLHS = 32] = "DotLHS", ASTFlags1[ASTFlags1.IsStatement = 64] = "IsStatement", ASTFlags1[ASTFlags1.StrictMode = 128] = "StrictMode", ASTFlags1[ASTFlags1.PossibleOptionalParameter = 256] = "PossibleOptionalParameter", ASTFlags1[ASTFlags1.ClassBaseConstructorCall = 512] = "ClassBaseConstructorCall", ASTFlags1[ASTFlags1.OptionalName = 1024] = "OptionalName", ASTFlags1[ASTFlags1.SkipNextRParen = 2048] = "SkipNextRParen", (DeclFlags1 = DeclFlags || (DeclFlags = {
-    }))[DeclFlags1.None = 0] = "None", DeclFlags1[DeclFlags1.Exported = 1] = "Exported", DeclFlags1[DeclFlags1.Private = 2] = "Private", DeclFlags1[DeclFlags1.Public = 4] = "Public", DeclFlags1[DeclFlags1.Ambient = 8] = "Ambient", DeclFlags1[DeclFlags1.Static = 16] = "Static", DeclFlags1[DeclFlags1.LocalStatic = 32] = "LocalStatic", DeclFlags1[DeclFlags1.GetAccessor = 64] = "GetAccessor", DeclFlags1[DeclFlags1.SetAccessor = 128] = "SetAccessor", (ModuleFlags1 = ModuleFlags || (ModuleFlags = {
-    }))[ModuleFlags1.None = 0] = "None", ModuleFlags1[ModuleFlags1.Exported = 1] = "Exported", ModuleFlags1[ModuleFlags1.Private = 2] = "Private", ModuleFlags1[ModuleFlags1.Public = 4] = "Public", ModuleFlags1[ModuleFlags1.Ambient = 8] = "Ambient", ModuleFlags1[ModuleFlags1.Static = 16] = "Static", ModuleFlags1[ModuleFlags1.LocalStatic = 32] = "LocalStatic", ModuleFlags1[ModuleFlags1.GetAccessor = 64] = "GetAccessor", ModuleFlags1[ModuleFlags1.SetAccessor = 128] = "SetAccessor", ModuleFlags1[ModuleFlags1.IsEnum = 256] = "IsEnum", ModuleFlags1[ModuleFlags1.ShouldEmitModuleDecl = 512] = "ShouldEmitModuleDecl", ModuleFlags1[ModuleFlags1.IsWholeFile = 1024] = "IsWholeFile", ModuleFlags1[ModuleFlags1.IsDynamic = 2048] = "IsDynamic", ModuleFlags1[ModuleFlags1.MustCaptureThis = 4096] = "MustCaptureThis", (SymbolFlags1 = SymbolFlags || (SymbolFlags = {
-    }))[SymbolFlags1.None = 0] = "None", SymbolFlags1[SymbolFlags1.Exported = 1] = "Exported", SymbolFlags1[SymbolFlags1.Private = 2] = "Private", SymbolFlags1[SymbolFlags1.Public = 4] = "Public", SymbolFlags1[SymbolFlags1.Ambient = 8] = "Ambient", SymbolFlags1[SymbolFlags1.Static = 16] = "Static", SymbolFlags1[SymbolFlags1.LocalStatic = 32] = "LocalStatic", SymbolFlags1[SymbolFlags1.GetAccessor = 64] = "GetAccessor", SymbolFlags1[SymbolFlags1.SetAccessor = 128] = "SetAccessor", SymbolFlags1[SymbolFlags1.Property = 256] = "Property", SymbolFlags1[SymbolFlags1.Readonly = 512] = "Readonly", SymbolFlags1[SymbolFlags1.ModuleMember = 1024] = "ModuleMember", SymbolFlags1[SymbolFlags1.InterfaceMember = 2048] = "InterfaceMember", SymbolFlags1[SymbolFlags1.ClassMember = 4096] = "ClassMember", SymbolFlags1[SymbolFlags1.BuiltIn = 8192] = "BuiltIn", SymbolFlags1[SymbolFlags1.TypeSetDuringScopeAssignment = 16384] = "TypeSetDuringScopeAssignment", SymbolFlags1[SymbolFlags1.Constant = 32768] = "Constant", SymbolFlags1[SymbolFlags1.Optional = 65536] = "Optional", SymbolFlags1[SymbolFlags1.RecursivelyReferenced = 131072] = "RecursivelyReferenced", SymbolFlags1[SymbolFlags1.Bound = 262144] = "Bound", SymbolFlags1[SymbolFlags1.CompilerGenerated = 524288] = "CompilerGenerated", (VarFlags1 = VarFlags || (VarFlags = {
-    }))[VarFlags1.None = 0] = "None", VarFlags1[VarFlags1.Exported = 1] = "Exported", VarFlags1[VarFlags1.Private = 2] = "Private", VarFlags1[VarFlags1.Public = 4] = "Public", VarFlags1[VarFlags1.Ambient = 8] = "Ambient", VarFlags1[VarFlags1.Static = 16] = "Static", VarFlags1[VarFlags1.LocalStatic = 32] = "LocalStatic", VarFlags1[VarFlags1.GetAccessor = 64] = "GetAccessor", VarFlags1[VarFlags1.SetAccessor = 128] = "SetAccessor", VarFlags1[VarFlags1.AutoInit = 256] = "AutoInit", VarFlags1[VarFlags1.Property = 512] = "Property", VarFlags1[VarFlags1.Readonly = 1024] = "Readonly", VarFlags1[VarFlags1.Class = 2048] = "Class", VarFlags1[VarFlags1.ClassProperty = 4096] = "ClassProperty", VarFlags1[VarFlags1.ClassBodyProperty = 8192] = "ClassBodyProperty", VarFlags1[VarFlags1.ClassConstructorProperty = 16384] = "ClassConstructorProperty", VarFlags1[VarFlags1.ClassSuperMustBeFirstCallInConstructor = 32768] = "ClassSuperMustBeFirstCallInConstructor", VarFlags1[VarFlags1.Constant = 65536] = "Constant", VarFlags1[VarFlags1.MustCaptureThis = 131072] = "MustCaptureThis", (FncFlags1 = FncFlags || (FncFlags = {
-    }))[FncFlags1.None = 0] = "None", FncFlags1[FncFlags1.Exported = 1] = "Exported", FncFlags1[FncFlags1.Private = 2] = "Private", FncFlags1[FncFlags1.Public = 4] = "Public", FncFlags1[FncFlags1.Ambient = 8] = "Ambient", FncFlags1[FncFlags1.Static = 16] = "Static", FncFlags1[FncFlags1.LocalStatic = 32] = "LocalStatic", FncFlags1[FncFlags1.GetAccessor = 64] = "GetAccessor", FncFlags1[FncFlags1.SetAccessor = 128] = "SetAccessor", FncFlags1[FncFlags1.Definition = 256] = "Definition", FncFlags1[FncFlags1.Signature = 512] = "Signature", FncFlags1[FncFlags1.Method = 1024] = "Method", FncFlags1[FncFlags1.HasReturnExpression = 2048] = "HasReturnExpression", FncFlags1[FncFlags1.CallMember = 4096] = "CallMember", FncFlags1[FncFlags1.ConstructMember = 8192] = "ConstructMember", FncFlags1[FncFlags1.HasSelfReference = 16384] = "HasSelfReference", FncFlags1[FncFlags1.IsFatArrowFunction = 32768] = "IsFatArrowFunction", FncFlags1[FncFlags1.IndexerMember = 65536] = "IndexerMember", FncFlags1[FncFlags1.IsFunctionExpression = 131072] = "IsFunctionExpression", FncFlags1[FncFlags1.ClassMethod = 262144] = "ClassMethod", FncFlags1[FncFlags1.ClassPropertyMethodExported = 524288] = "ClassPropertyMethodExported", (SignatureFlags1 = SignatureFlags || (SignatureFlags = {
-    }))[SignatureFlags1.None = 0] = "None", SignatureFlags1[SignatureFlags1.IsIndexer = 1] = "IsIndexer", SignatureFlags1[SignatureFlags1.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags1[SignatureFlags1.IsNumberIndexer = 4] = "IsNumberIndexer", TypeScript1.ToDeclFlags = function(fncOrVarOrSymbolOrModuleFlags) {
+    }, (ErrorRecoverySet = ErrorRecoverySet || (ErrorRecoverySet = {
+    }))[ErrorRecoverySet.None = 0] = "None", ErrorRecoverySet[ErrorRecoverySet.Comma = 1] = "Comma", ErrorRecoverySet[ErrorRecoverySet.SColon = 2] = "SColon", ErrorRecoverySet[ErrorRecoverySet.Asg = 4] = "Asg", ErrorRecoverySet[ErrorRecoverySet.BinOp = 8] = "BinOp", ErrorRecoverySet[ErrorRecoverySet.RBrack = 16] = "RBrack", ErrorRecoverySet[ErrorRecoverySet.RCurly = 32] = "RCurly", ErrorRecoverySet[ErrorRecoverySet.RParen = 64] = "RParen", ErrorRecoverySet[ErrorRecoverySet.Dot = 128] = "Dot", ErrorRecoverySet[ErrorRecoverySet.Colon = 256] = "Colon", ErrorRecoverySet[ErrorRecoverySet.PrimType = 512] = "PrimType", ErrorRecoverySet[ErrorRecoverySet.AddOp = 1024] = "AddOp", ErrorRecoverySet[ErrorRecoverySet.LCurly = 2048] = "LCurly", ErrorRecoverySet[ErrorRecoverySet.PreOp = 4096] = "PreOp", ErrorRecoverySet[ErrorRecoverySet.RegExp = 8192] = "RegExp", ErrorRecoverySet[ErrorRecoverySet.LParen = 16384] = "LParen", ErrorRecoverySet[ErrorRecoverySet.LBrack = 32768] = "LBrack", ErrorRecoverySet[ErrorRecoverySet.Scope = 65536] = "Scope", ErrorRecoverySet[ErrorRecoverySet.In = 131072] = "In", ErrorRecoverySet[ErrorRecoverySet.SCase = 262144] = "SCase", ErrorRecoverySet[ErrorRecoverySet.Else = 524288] = "Else", ErrorRecoverySet[ErrorRecoverySet.Catch = 1048576] = "Catch", ErrorRecoverySet[ErrorRecoverySet.Var = 2097152] = "Var", ErrorRecoverySet[ErrorRecoverySet.Stmt = 4194304] = "Stmt", ErrorRecoverySet[ErrorRecoverySet.While = 8388608] = "While", ErrorRecoverySet[ErrorRecoverySet.ID = 16777216] = "ID", ErrorRecoverySet[ErrorRecoverySet.Prefix = 33554432] = "Prefix", ErrorRecoverySet[ErrorRecoverySet.Literal = 67108864] = "Literal", ErrorRecoverySet[ErrorRecoverySet.RLit = 134217728] = "RLit", ErrorRecoverySet[ErrorRecoverySet.Func = 268435456] = "Func", ErrorRecoverySet[ErrorRecoverySet.EOF = 536870912] = "EOF", ErrorRecoverySet[ErrorRecoverySet.TypeScriptS = 1073741824] = "TypeScriptS", ErrorRecoverySet[ErrorRecoverySet.ExprStart = 520158210] = "ExprStart", ErrorRecoverySet[ErrorRecoverySet.StmtStart = 1608580098] = "StmtStart", ErrorRecoverySet[ErrorRecoverySet.Postfix = 49280] = "Postfix", (AllowedElements = AllowedElements || (AllowedElements = {
+    }))[AllowedElements.None = 0] = "None", AllowedElements[AllowedElements.ModuleDeclarations = 4] = "ModuleDeclarations", AllowedElements[AllowedElements.ClassDeclarations = 8] = "ClassDeclarations", AllowedElements[AllowedElements.InterfaceDeclarations = 16] = "InterfaceDeclarations", AllowedElements[AllowedElements.AmbientDeclarations = 1024] = "AmbientDeclarations", AllowedElements[AllowedElements.Properties = 2048] = "Properties", AllowedElements[AllowedElements.Global = 1052] = "Global", AllowedElements[AllowedElements.QuickParse = 3100] = "QuickParse", (Modifiers = Modifiers || (Modifiers = {
+    }))[Modifiers.None = 0] = "None", Modifiers[Modifiers.Private = 1] = "Private", Modifiers[Modifiers.Public = 2] = "Public", Modifiers[Modifiers.Readonly = 4] = "Readonly", Modifiers[Modifiers.Ambient = 8] = "Ambient", Modifiers[Modifiers.Exported = 16] = "Exported", Modifiers[Modifiers.Getter = 32] = "Getter", Modifiers[Modifiers.Setter = 64] = "Setter", Modifiers[Modifiers.Static = 128] = "Static", (ASTFlags = ASTFlags || (ASTFlags = {
+    }))[ASTFlags.None = 0] = "None", ASTFlags[ASTFlags.ExplicitSemicolon = 1] = "ExplicitSemicolon", ASTFlags[ASTFlags.AutomaticSemicolon = 2] = "AutomaticSemicolon", ASTFlags[ASTFlags.Writeable = 4] = "Writeable", ASTFlags[ASTFlags.Error = 8] = "Error", ASTFlags[ASTFlags.DotLHSPartial = 16] = "DotLHSPartial", ASTFlags[ASTFlags.DotLHS = 32] = "DotLHS", ASTFlags[ASTFlags.IsStatement = 64] = "IsStatement", ASTFlags[ASTFlags.StrictMode = 128] = "StrictMode", ASTFlags[ASTFlags.PossibleOptionalParameter = 256] = "PossibleOptionalParameter", ASTFlags[ASTFlags.ClassBaseConstructorCall = 512] = "ClassBaseConstructorCall", ASTFlags[ASTFlags.OptionalName = 1024] = "OptionalName", ASTFlags[ASTFlags.SkipNextRParen = 2048] = "SkipNextRParen", (DeclFlags = DeclFlags || (DeclFlags = {
+    }))[DeclFlags.None = 0] = "None", DeclFlags[DeclFlags.Exported = 1] = "Exported", DeclFlags[DeclFlags.Private = 2] = "Private", DeclFlags[DeclFlags.Public = 4] = "Public", DeclFlags[DeclFlags.Ambient = 8] = "Ambient", DeclFlags[DeclFlags.Static = 16] = "Static", DeclFlags[DeclFlags.LocalStatic = 32] = "LocalStatic", DeclFlags[DeclFlags.GetAccessor = 64] = "GetAccessor", DeclFlags[DeclFlags.SetAccessor = 128] = "SetAccessor", (ModuleFlags = ModuleFlags || (ModuleFlags = {
+    }))[ModuleFlags.None = 0] = "None", ModuleFlags[ModuleFlags.Exported = 1] = "Exported", ModuleFlags[ModuleFlags.Private = 2] = "Private", ModuleFlags[ModuleFlags.Public = 4] = "Public", ModuleFlags[ModuleFlags.Ambient = 8] = "Ambient", ModuleFlags[ModuleFlags.Static = 16] = "Static", ModuleFlags[ModuleFlags.LocalStatic = 32] = "LocalStatic", ModuleFlags[ModuleFlags.GetAccessor = 64] = "GetAccessor", ModuleFlags[ModuleFlags.SetAccessor = 128] = "SetAccessor", ModuleFlags[ModuleFlags.IsEnum = 256] = "IsEnum", ModuleFlags[ModuleFlags.ShouldEmitModuleDecl = 512] = "ShouldEmitModuleDecl", ModuleFlags[ModuleFlags.IsWholeFile = 1024] = "IsWholeFile", ModuleFlags[ModuleFlags.IsDynamic = 2048] = "IsDynamic", ModuleFlags[ModuleFlags.MustCaptureThis = 4096] = "MustCaptureThis", (SymbolFlags = SymbolFlags || (SymbolFlags = {
+    }))[SymbolFlags.None = 0] = "None", SymbolFlags[SymbolFlags.Exported = 1] = "Exported", SymbolFlags[SymbolFlags.Private = 2] = "Private", SymbolFlags[SymbolFlags.Public = 4] = "Public", SymbolFlags[SymbolFlags.Ambient = 8] = "Ambient", SymbolFlags[SymbolFlags.Static = 16] = "Static", SymbolFlags[SymbolFlags.LocalStatic = 32] = "LocalStatic", SymbolFlags[SymbolFlags.GetAccessor = 64] = "GetAccessor", SymbolFlags[SymbolFlags.SetAccessor = 128] = "SetAccessor", SymbolFlags[SymbolFlags.Property = 256] = "Property", SymbolFlags[SymbolFlags.Readonly = 512] = "Readonly", SymbolFlags[SymbolFlags.ModuleMember = 1024] = "ModuleMember", SymbolFlags[SymbolFlags.InterfaceMember = 2048] = "InterfaceMember", SymbolFlags[SymbolFlags.ClassMember = 4096] = "ClassMember", SymbolFlags[SymbolFlags.BuiltIn = 8192] = "BuiltIn", SymbolFlags[SymbolFlags.TypeSetDuringScopeAssignment = 16384] = "TypeSetDuringScopeAssignment", SymbolFlags[SymbolFlags.Constant = 32768] = "Constant", SymbolFlags[SymbolFlags.Optional = 65536] = "Optional", SymbolFlags[SymbolFlags.RecursivelyReferenced = 131072] = "RecursivelyReferenced", SymbolFlags[SymbolFlags.Bound = 262144] = "Bound", SymbolFlags[SymbolFlags.CompilerGenerated = 524288] = "CompilerGenerated", (VarFlags = VarFlags || (VarFlags = {
+    }))[VarFlags.None = 0] = "None", VarFlags[VarFlags.Exported = 1] = "Exported", VarFlags[VarFlags.Private = 2] = "Private", VarFlags[VarFlags.Public = 4] = "Public", VarFlags[VarFlags.Ambient = 8] = "Ambient", VarFlags[VarFlags.Static = 16] = "Static", VarFlags[VarFlags.LocalStatic = 32] = "LocalStatic", VarFlags[VarFlags.GetAccessor = 64] = "GetAccessor", VarFlags[VarFlags.SetAccessor = 128] = "SetAccessor", VarFlags[VarFlags.AutoInit = 256] = "AutoInit", VarFlags[VarFlags.Property = 512] = "Property", VarFlags[VarFlags.Readonly = 1024] = "Readonly", VarFlags[VarFlags.Class = 2048] = "Class", VarFlags[VarFlags.ClassProperty = 4096] = "ClassProperty", VarFlags[VarFlags.ClassBodyProperty = 8192] = "ClassBodyProperty", VarFlags[VarFlags.ClassConstructorProperty = 16384] = "ClassConstructorProperty", VarFlags[VarFlags.ClassSuperMustBeFirstCallInConstructor = 32768] = "ClassSuperMustBeFirstCallInConstructor", VarFlags[VarFlags.Constant = 65536] = "Constant", VarFlags[VarFlags.MustCaptureThis = 131072] = "MustCaptureThis", (FncFlags = FncFlags || (FncFlags = {
+    }))[FncFlags.None = 0] = "None", FncFlags[FncFlags.Exported = 1] = "Exported", FncFlags[FncFlags.Private = 2] = "Private", FncFlags[FncFlags.Public = 4] = "Public", FncFlags[FncFlags.Ambient = 8] = "Ambient", FncFlags[FncFlags.Static = 16] = "Static", FncFlags[FncFlags.LocalStatic = 32] = "LocalStatic", FncFlags[FncFlags.GetAccessor = 64] = "GetAccessor", FncFlags[FncFlags.SetAccessor = 128] = "SetAccessor", FncFlags[FncFlags.Definition = 256] = "Definition", FncFlags[FncFlags.Signature = 512] = "Signature", FncFlags[FncFlags.Method = 1024] = "Method", FncFlags[FncFlags.HasReturnExpression = 2048] = "HasReturnExpression", FncFlags[FncFlags.CallMember = 4096] = "CallMember", FncFlags[FncFlags.ConstructMember = 8192] = "ConstructMember", FncFlags[FncFlags.HasSelfReference = 16384] = "HasSelfReference", FncFlags[FncFlags.IsFatArrowFunction = 32768] = "IsFatArrowFunction", FncFlags[FncFlags.IndexerMember = 65536] = "IndexerMember", FncFlags[FncFlags.IsFunctionExpression = 131072] = "IsFunctionExpression", FncFlags[FncFlags.ClassMethod = 262144] = "ClassMethod", FncFlags[FncFlags.ClassPropertyMethodExported = 524288] = "ClassPropertyMethodExported", (SignatureFlags = SignatureFlags || (SignatureFlags = {
+    }))[SignatureFlags.None = 0] = "None", SignatureFlags[SignatureFlags.IsIndexer = 1] = "IsIndexer", SignatureFlags[SignatureFlags.IsStringIndexer = 2] = "IsStringIndexer", SignatureFlags[SignatureFlags.IsNumberIndexer = 4] = "IsNumberIndexer", TypeScript1.ToDeclFlags = function(fncOrVarOrSymbolOrModuleFlags) {
         return fncOrVarOrSymbolOrModuleFlags;
-    }, (TypeFlags1 = TypeFlags || (TypeFlags = {
-    }))[TypeFlags1.None = 0] = "None", TypeFlags1[TypeFlags1.HasImplementation = 1] = "HasImplementation", TypeFlags1[TypeFlags1.HasSelfReference = 2] = "HasSelfReference", TypeFlags1[TypeFlags1.MergeResult = 4] = "MergeResult", TypeFlags1[TypeFlags1.IsEnum = 8] = "IsEnum", TypeFlags1[TypeFlags1.BuildingName = 16] = "BuildingName", TypeFlags1[TypeFlags1.HasBaseType = 32] = "HasBaseType", TypeFlags1[TypeFlags1.HasBaseTypeOfObject = 64] = "HasBaseTypeOfObject", TypeFlags1[TypeFlags1.IsClass = 128] = "IsClass", (TypeRelationshipFlags1 = TypeRelationshipFlags || (TypeRelationshipFlags = {
-    }))[TypeRelationshipFlags1.SuccessfulComparison = 0] = "SuccessfulComparison", TypeRelationshipFlags1[TypeRelationshipFlags1.SourceIsNullTargetIsVoidOrUndefined = 1] = "SourceIsNullTargetIsVoidOrUndefined", TypeRelationshipFlags1[TypeRelationshipFlags1.RequiredPropertyIsMissing = 2] = "RequiredPropertyIsMissing", TypeRelationshipFlags1[TypeRelationshipFlags1.IncompatibleSignatures = 4] = "IncompatibleSignatures", TypeRelationshipFlags1[TypeRelationshipFlags1.SourceSignatureHasTooManyParameters = 3] = "SourceSignatureHasTooManyParameters", TypeRelationshipFlags1[TypeRelationshipFlags1.IncompatibleReturnTypes = 16] = "IncompatibleReturnTypes", TypeRelationshipFlags1[TypeRelationshipFlags1.IncompatiblePropertyTypes = 32] = "IncompatiblePropertyTypes", TypeRelationshipFlags1[TypeRelationshipFlags1.IncompatibleParameterTypes = 64] = "IncompatibleParameterTypes", (CodeGenTarget1 = CodeGenTarget || (CodeGenTarget = {
-    }))[CodeGenTarget1.ES3 = 0] = "ES3", CodeGenTarget1[CodeGenTarget1.ES5 = 1] = "ES5", (ModuleGenTarget1 = ModuleGenTarget || (ModuleGenTarget = {
-    }))[ModuleGenTarget1.Synchronous = 0] = "Synchronous", ModuleGenTarget1[ModuleGenTarget1.Asynchronous = 1] = "Asynchronous", ModuleGenTarget1[ModuleGenTarget1.Local = 2] = "Local", TypeScript1.codeGenTarget = CodeGenTarget.ES3, TypeScript1.moduleGenTarget = ModuleGenTarget.Synchronous, TypeScript1.optimizeModuleCodeGen = !0, TypeScript1.flagsToString = function(e, flags) {
+    }, (TypeFlags = TypeFlags || (TypeFlags = {
+    }))[TypeFlags.None = 0] = "None", TypeFlags[TypeFlags.HasImplementation = 1] = "HasImplementation", TypeFlags[TypeFlags.HasSelfReference = 2] = "HasSelfReference", TypeFlags[TypeFlags.MergeResult = 4] = "MergeResult", TypeFlags[TypeFlags.IsEnum = 8] = "IsEnum", TypeFlags[TypeFlags.BuildingName = 16] = "BuildingName", TypeFlags[TypeFlags.HasBaseType = 32] = "HasBaseType", TypeFlags[TypeFlags.HasBaseTypeOfObject = 64] = "HasBaseTypeOfObject", TypeFlags[TypeFlags.IsClass = 128] = "IsClass", (TypeRelationshipFlags = TypeRelationshipFlags || (TypeRelationshipFlags = {
+    }))[TypeRelationshipFlags.SuccessfulComparison = 0] = "SuccessfulComparison", TypeRelationshipFlags[TypeRelationshipFlags.SourceIsNullTargetIsVoidOrUndefined = 1] = "SourceIsNullTargetIsVoidOrUndefined", TypeRelationshipFlags[TypeRelationshipFlags.RequiredPropertyIsMissing = 2] = "RequiredPropertyIsMissing", TypeRelationshipFlags[TypeRelationshipFlags.IncompatibleSignatures = 4] = "IncompatibleSignatures", TypeRelationshipFlags[TypeRelationshipFlags.SourceSignatureHasTooManyParameters = 3] = "SourceSignatureHasTooManyParameters", TypeRelationshipFlags[TypeRelationshipFlags.IncompatibleReturnTypes = 16] = "IncompatibleReturnTypes", TypeRelationshipFlags[TypeRelationshipFlags.IncompatiblePropertyTypes = 32] = "IncompatiblePropertyTypes", TypeRelationshipFlags[TypeRelationshipFlags.IncompatibleParameterTypes = 64] = "IncompatibleParameterTypes", (CodeGenTarget = CodeGenTarget || (CodeGenTarget = {
+    }))[CodeGenTarget.ES3 = 0] = "ES3", CodeGenTarget[CodeGenTarget.ES5 = 1] = "ES5", (ModuleGenTarget = ModuleGenTarget || (ModuleGenTarget = {
+    }))[ModuleGenTarget.Synchronous = 0] = "Synchronous", ModuleGenTarget[ModuleGenTarget.Asynchronous = 1] = "Asynchronous", ModuleGenTarget[ModuleGenTarget.Local = 2] = "Local", TypeScript1.codeGenTarget = CodeGenTarget.ES3, TypeScript1.moduleGenTarget = ModuleGenTarget.Synchronous, TypeScript1.optimizeModuleCodeGen = !0, TypeScript1.flagsToString = function(e, flags) {
         for(var builder = "", i = 1; i < -2147483648; i <<= 1)if ((flags & i) != 0) {
             for(var k in e)if (e[k] == i) {
                 builder.length > 0 && (builder += "|"), builder += k;
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es2015.1.normal/output.js
index 78423035977..5340ab9c58d 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es2015.1.normal/output.js
@@ -3,7 +3,7 @@
 ///<reference path='typescript.ts' />
 var TypeScript;
 (function(TypeScript1) {
-    var NodeType1;
+    let NodeType;
     (function(NodeType) {
         NodeType[NodeType["None"] = 0] = "None";
         NodeType[NodeType["Empty"] = 1] = "Empty";
@@ -112,10 +112,10 @@ var TypeScript;
         NodeType[NodeType["Error"] = 104] = "Error";
         NodeType[NodeType["Comment"] = 105] = "Comment";
         NodeType[NodeType["Debugger"] = 106] = "Debugger";
-        NodeType[NodeType["GeneralNode"] = 71] = "GeneralNode";
-        NodeType[NodeType["LastAsg"] = 41] = "LastAsg";
-    })(NodeType1 || (NodeType1 = {
+        NodeType[NodeType["GeneralNode"] = FuncDecl] = "GeneralNode";
+        NodeType[NodeType["LastAsg"] = AsgRs2] = "LastAsg";
+    })(NodeType || (NodeType = {
     }));
-    TypeScript1.NodeType = NodeType1;
+    TypeScript1.NodeType = NodeType;
 })(TypeScript || (TypeScript = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es2015.2.minified/output.js
index 14ff8edd84e..b65fb47ccb6 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es2015.2.minified/output.js
@@ -1,7 +1,8 @@
 var TypeScript;
 !function(TypeScript1) {
-    var NodeType, NodeType1;
-    (NodeType1 = NodeType || (NodeType = {
-    }))[NodeType1.None = 0] = "None", NodeType1[NodeType1.Empty = 1] = "Empty", NodeType1[NodeType1.EmptyExpr = 2] = "EmptyExpr", NodeType1[NodeType1.True = 3] = "True", NodeType1[NodeType1.False = 4] = "False", NodeType1[NodeType1.This = 5] = "This", NodeType1[NodeType1.Super = 6] = "Super", NodeType1[NodeType1.QString = 7] = "QString", NodeType1[NodeType1.Regex = 8] = "Regex", NodeType1[NodeType1.Null = 9] = "Null", NodeType1[NodeType1.ArrayLit = 10] = "ArrayLit", NodeType1[NodeType1.ObjectLit = 11] = "ObjectLit", NodeType1[NodeType1.Void = 12] = "Void", NodeType1[NodeType1.Comma = 13] = "Comma", NodeType1[NodeType1.Pos = 14] = "Pos", NodeType1[NodeType1.Neg = 15] = "Neg", NodeType1[NodeType1.Delete = 16] = "Delete", NodeType1[NodeType1.Await = 17] = "Await", NodeType1[NodeType1.In = 18] = "In", NodeType1[NodeType1.Dot = 19] = "Dot", NodeType1[NodeType1.From = 20] = "From", NodeType1[NodeType1.Is = 21] = "Is", NodeType1[NodeType1.InstOf = 22] = "InstOf", NodeType1[NodeType1.Typeof = 23] = "Typeof", NodeType1[NodeType1.NumberLit = 24] = "NumberLit", NodeType1[NodeType1.Name = 25] = "Name", NodeType1[NodeType1.TypeRef = 26] = "TypeRef", NodeType1[NodeType1.Index = 27] = "Index", NodeType1[NodeType1.Call = 28] = "Call", NodeType1[NodeType1.New = 29] = "New", NodeType1[NodeType1.Asg = 30] = "Asg", NodeType1[NodeType1.AsgAdd = 31] = "AsgAdd", NodeType1[NodeType1.AsgSub = 32] = "AsgSub", NodeType1[NodeType1.AsgDiv = 33] = "AsgDiv", NodeType1[NodeType1.AsgMul = 34] = "AsgMul", NodeType1[NodeType1.AsgMod = 35] = "AsgMod", NodeType1[NodeType1.AsgAnd = 36] = "AsgAnd", NodeType1[NodeType1.AsgXor = 37] = "AsgXor", NodeType1[NodeType1.AsgOr = 38] = "AsgOr", NodeType1[NodeType1.AsgLsh = 39] = "AsgLsh", NodeType1[NodeType1.AsgRsh = 40] = "AsgRsh", NodeType1[NodeType1.AsgRs2 = 41] = "AsgRs2", NodeType1[NodeType1.ConditionalExpression = 42] = "ConditionalExpression", NodeType1[NodeType1.LogOr = 43] = "LogOr", NodeType1[NodeType1.LogAnd = 44] = "LogAnd", NodeType1[NodeType1.Or = 45] = "Or", NodeType1[NodeType1.Xor = 46] = "Xor", NodeType1[NodeType1.And = 47] = "And", NodeType1[NodeType1.Eq = 48] = "Eq", NodeType1[NodeType1.Ne = 49] = "Ne", NodeType1[NodeType1.Eqv = 50] = "Eqv", NodeType1[NodeType1.NEqv = 51] = "NEqv", NodeType1[NodeType1.Lt = 52] = "Lt", NodeType1[NodeType1.Le = 53] = "Le", NodeType1[NodeType1.Gt = 54] = "Gt", NodeType1[NodeType1.Ge = 55] = "Ge", NodeType1[NodeType1.Add = 56] = "Add", NodeType1[NodeType1.Sub = 57] = "Sub", NodeType1[NodeType1.Mul = 58] = "Mul", NodeType1[NodeType1.Div = 59] = "Div", NodeType1[NodeType1.Mod = 60] = "Mod", NodeType1[NodeType1.Lsh = 61] = "Lsh", NodeType1[NodeType1.Rsh = 62] = "Rsh", NodeType1[NodeType1.Rs2 = 63] = "Rs2", NodeType1[NodeType1.Not = 64] = "Not", NodeType1[NodeType1.LogNot = 65] = "LogNot", NodeType1[NodeType1.IncPre = 66] = "IncPre", NodeType1[NodeType1.DecPre = 67] = "DecPre", NodeType1[NodeType1.IncPost = 68] = "IncPost", NodeType1[NodeType1.DecPost = 69] = "DecPost", NodeType1[NodeType1.TypeAssertion = 70] = "TypeAssertion", NodeType1[NodeType1.FuncDecl = 71] = "FuncDecl", NodeType1[NodeType1.Member = 72] = "Member", NodeType1[NodeType1.VarDecl = 73] = "VarDecl", NodeType1[NodeType1.ArgDecl = 74] = "ArgDecl", NodeType1[NodeType1.Return = 75] = "Return", NodeType1[NodeType1.Break = 76] = "Break", NodeType1[NodeType1.Continue = 77] = "Continue", NodeType1[NodeType1.Throw = 78] = "Throw", NodeType1[NodeType1.For = 79] = "For", NodeType1[NodeType1.ForIn = 80] = "ForIn", NodeType1[NodeType1.If = 81] = "If", NodeType1[NodeType1.While = 82] = "While", NodeType1[NodeType1.DoWhile = 83] = "DoWhile", NodeType1[NodeType1.Block = 84] = "Block", NodeType1[NodeType1.Case = 85] = "Case", NodeType1[NodeType1.Switch = 86] = "Switch", NodeType1[NodeType1.Try = 87] = "Try", NodeType1[NodeType1.TryCatch = 88] = "TryCatch", NodeType1[NodeType1.TryFinally = 89] = "TryFinally", NodeType1[NodeType1.Finally = 90] = "Finally", NodeType1[NodeType1.Catch = 91] = "Catch", NodeType1[NodeType1.List = 92] = "List", NodeType1[NodeType1.Script = 93] = "Script", NodeType1[NodeType1.ClassDeclaration = 94] = "ClassDeclaration", NodeType1[NodeType1.InterfaceDeclaration = 95] = "InterfaceDeclaration", NodeType1[NodeType1.ModuleDeclaration = 96] = "ModuleDeclaration", NodeType1[NodeType1.ImportDeclaration = 97] = "ImportDeclaration", NodeType1[NodeType1.With = 98] = "With", NodeType1[NodeType1.Label = 99] = "Label", NodeType1[NodeType1.LabeledStatement = 100] = "LabeledStatement", NodeType1[NodeType1.EBStart = 101] = "EBStart", NodeType1[NodeType1.GotoEB = 102] = "GotoEB", NodeType1[NodeType1.EndCode = 103] = "EndCode", NodeType1[NodeType1.Error = 104] = "Error", NodeType1[NodeType1.Comment = 105] = "Comment", NodeType1[NodeType1.Debugger = 106] = "Debugger", NodeType1[NodeType1.GeneralNode = 71] = "GeneralNode", NodeType1[NodeType1.LastAsg = 41] = "LastAsg", TypeScript1.NodeType = NodeType;
+    var NodeType;
+    let NodeType;
+    (NodeType = NodeType || (NodeType = {
+    }))[NodeType.None = 0] = "None", NodeType[NodeType.Empty = 1] = "Empty", NodeType[NodeType.EmptyExpr = 2] = "EmptyExpr", NodeType[NodeType.True = 3] = "True", NodeType[NodeType.False = 4] = "False", NodeType[NodeType.This = 5] = "This", NodeType[NodeType.Super = 6] = "Super", NodeType[NodeType.QString = 7] = "QString", NodeType[NodeType.Regex = 8] = "Regex", NodeType[NodeType.Null = 9] = "Null", NodeType[NodeType.ArrayLit = 10] = "ArrayLit", NodeType[NodeType.ObjectLit = 11] = "ObjectLit", NodeType[NodeType.Void = 12] = "Void", NodeType[NodeType.Comma = 13] = "Comma", NodeType[NodeType.Pos = 14] = "Pos", NodeType[NodeType.Neg = 15] = "Neg", NodeType[NodeType.Delete = 16] = "Delete", NodeType[NodeType.Await = 17] = "Await", NodeType[NodeType.In = 18] = "In", NodeType[NodeType.Dot = 19] = "Dot", NodeType[NodeType.From = 20] = "From", NodeType[NodeType.Is = 21] = "Is", NodeType[NodeType.InstOf = 22] = "InstOf", NodeType[NodeType.Typeof = 23] = "Typeof", NodeType[NodeType.NumberLit = 24] = "NumberLit", NodeType[NodeType.Name = 25] = "Name", NodeType[NodeType.TypeRef = 26] = "TypeRef", NodeType[NodeType.Index = 27] = "Index", NodeType[NodeType.Call = 28] = "Call", NodeType[NodeType.New = 29] = "New", NodeType[NodeType.Asg = 30] = "Asg", NodeType[NodeType.AsgAdd = 31] = "AsgAdd", NodeType[NodeType.AsgSub = 32] = "AsgSub", NodeType[NodeType.AsgDiv = 33] = "AsgDiv", NodeType[NodeType.AsgMul = 34] = "AsgMul", NodeType[NodeType.AsgMod = 35] = "AsgMod", NodeType[NodeType.AsgAnd = 36] = "AsgAnd", NodeType[NodeType.AsgXor = 37] = "AsgXor", NodeType[NodeType.AsgOr = 38] = "AsgOr", NodeType[NodeType.AsgLsh = 39] = "AsgLsh", NodeType[NodeType.AsgRsh = 40] = "AsgRsh", NodeType[NodeType.AsgRs2 = 41] = "AsgRs2", NodeType[NodeType.ConditionalExpression = 42] = "ConditionalExpression", NodeType[NodeType.LogOr = 43] = "LogOr", NodeType[NodeType.LogAnd = 44] = "LogAnd", NodeType[NodeType.Or = 45] = "Or", NodeType[NodeType.Xor = 46] = "Xor", NodeType[NodeType.And = 47] = "And", NodeType[NodeType.Eq = 48] = "Eq", NodeType[NodeType.Ne = 49] = "Ne", NodeType[NodeType.Eqv = 50] = "Eqv", NodeType[NodeType.NEqv = 51] = "NEqv", NodeType[NodeType.Lt = 52] = "Lt", NodeType[NodeType.Le = 53] = "Le", NodeType[NodeType.Gt = 54] = "Gt", NodeType[NodeType.Ge = 55] = "Ge", NodeType[NodeType.Add = 56] = "Add", NodeType[NodeType.Sub = 57] = "Sub", NodeType[NodeType.Mul = 58] = "Mul", NodeType[NodeType.Div = 59] = "Div", NodeType[NodeType.Mod = 60] = "Mod", NodeType[NodeType.Lsh = 61] = "Lsh", NodeType[NodeType.Rsh = 62] = "Rsh", NodeType[NodeType.Rs2 = 63] = "Rs2", NodeType[NodeType.Not = 64] = "Not", NodeType[NodeType.LogNot = 65] = "LogNot", NodeType[NodeType.IncPre = 66] = "IncPre", NodeType[NodeType.DecPre = 67] = "DecPre", NodeType[NodeType.IncPost = 68] = "IncPost", NodeType[NodeType.DecPost = 69] = "DecPost", NodeType[NodeType.TypeAssertion = 70] = "TypeAssertion", NodeType[NodeType.FuncDecl = 71] = "FuncDecl", NodeType[NodeType.Member = 72] = "Member", NodeType[NodeType.VarDecl = 73] = "VarDecl", NodeType[NodeType.ArgDecl = 74] = "ArgDecl", NodeType[NodeType.Return = 75] = "Return", NodeType[NodeType.Break = 76] = "Break", NodeType[NodeType.Continue = 77] = "Continue", NodeType[NodeType.Throw = 78] = "Throw", NodeType[NodeType.For = 79] = "For", NodeType[NodeType.ForIn = 80] = "ForIn", NodeType[NodeType.If = 81] = "If", NodeType[NodeType.While = 82] = "While", NodeType[NodeType.DoWhile = 83] = "DoWhile", NodeType[NodeType.Block = 84] = "Block", NodeType[NodeType.Case = 85] = "Case", NodeType[NodeType.Switch = 86] = "Switch", NodeType[NodeType.Try = 87] = "Try", NodeType[NodeType.TryCatch = 88] = "TryCatch", NodeType[NodeType.TryFinally = 89] = "TryFinally", NodeType[NodeType.Finally = 90] = "Finally", NodeType[NodeType.Catch = 91] = "Catch", NodeType[NodeType.List = 92] = "List", NodeType[NodeType.Script = 93] = "Script", NodeType[NodeType.ClassDeclaration = 94] = "ClassDeclaration", NodeType[NodeType.InterfaceDeclaration = 95] = "InterfaceDeclaration", NodeType[NodeType.ModuleDeclaration = 96] = "ModuleDeclaration", NodeType[NodeType.ImportDeclaration = 97] = "ImportDeclaration", NodeType[NodeType.With = 98] = "With", NodeType[NodeType.Label = 99] = "Label", NodeType[NodeType.LabeledStatement = 100] = "LabeledStatement", NodeType[NodeType.EBStart = 101] = "EBStart", NodeType[NodeType.GotoEB = 102] = "GotoEB", NodeType[NodeType.EndCode = 103] = "EndCode", NodeType[NodeType.Error = 104] = "Error", NodeType[NodeType.Comment = 105] = "Comment", NodeType[NodeType.Debugger = 106] = "Debugger", NodeType[NodeType.GeneralNode = FuncDecl] = "GeneralNode", NodeType[NodeType.LastAsg = AsgRs2] = "LastAsg", TypeScript1.NodeType = NodeType;
 }(TypeScript || (TypeScript = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es5.1.normal/output.js
index 78423035977..34ff2d48f4a 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es5.1.normal/output.js
@@ -3,7 +3,7 @@
 ///<reference path='typescript.ts' />
 var TypeScript;
 (function(TypeScript1) {
-    var NodeType1;
+    var NodeType;
     (function(NodeType) {
         NodeType[NodeType["None"] = 0] = "None";
         NodeType[NodeType["Empty"] = 1] = "Empty";
@@ -112,10 +112,10 @@ var TypeScript;
         NodeType[NodeType["Error"] = 104] = "Error";
         NodeType[NodeType["Comment"] = 105] = "Comment";
         NodeType[NodeType["Debugger"] = 106] = "Debugger";
-        NodeType[NodeType["GeneralNode"] = 71] = "GeneralNode";
-        NodeType[NodeType["LastAsg"] = 41] = "LastAsg";
-    })(NodeType1 || (NodeType1 = {
+        NodeType[NodeType["GeneralNode"] = FuncDecl] = "GeneralNode";
+        NodeType[NodeType["LastAsg"] = AsgRs2] = "LastAsg";
+    })(NodeType || (NodeType = {
     }));
-    TypeScript1.NodeType = NodeType1;
+    TypeScript1.NodeType = NodeType;
 })(TypeScript || (TypeScript = {
 }));
diff --git a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es5.2.minified/output.js
index 14ff8edd84e..9cfdee36ac6 100644
--- a/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/parser/ecmascript5/parserRealSource3/input.ts/es5.2.minified/output.js
@@ -1,7 +1,7 @@
 var TypeScript;
 !function(TypeScript1) {
-    var NodeType, NodeType1;
-    (NodeType1 = NodeType || (NodeType = {
-    }))[NodeType1.None = 0] = "None", NodeType1[NodeType1.Empty = 1] = "Empty", NodeType1[NodeType1.EmptyExpr = 2] = "EmptyExpr", NodeType1[NodeType1.True = 3] = "True", NodeType1[NodeType1.False = 4] = "False", NodeType1[NodeType1.This = 5] = "This", NodeType1[NodeType1.Super = 6] = "Super", NodeType1[NodeType1.QString = 7] = "QString", NodeType1[NodeType1.Regex = 8] = "Regex", NodeType1[NodeType1.Null = 9] = "Null", NodeType1[NodeType1.ArrayLit = 10] = "ArrayLit", NodeType1[NodeType1.ObjectLit = 11] = "ObjectLit", NodeType1[NodeType1.Void = 12] = "Void", NodeType1[NodeType1.Comma = 13] = "Comma", NodeType1[NodeType1.Pos = 14] = "Pos", NodeType1[NodeType1.Neg = 15] = "Neg", NodeType1[NodeType1.Delete = 16] = "Delete", NodeType1[NodeType1.Await = 17] = "Await", NodeType1[NodeType1.In = 18] = "In", NodeType1[NodeType1.Dot = 19] = "Dot", NodeType1[NodeType1.From = 20] = "From", NodeType1[NodeType1.Is = 21] = "Is", NodeType1[NodeType1.InstOf = 22] = "InstOf", NodeType1[NodeType1.Typeof = 23] = "Typeof", NodeType1[NodeType1.NumberLit = 24] = "NumberLit", NodeType1[NodeType1.Name = 25] = "Name", NodeType1[NodeType1.TypeRef = 26] = "TypeRef", NodeType1[NodeType1.Index = 27] = "Index", NodeType1[NodeType1.Call = 28] = "Call", NodeType1[NodeType1.New = 29] = "New", NodeType1[NodeType1.Asg = 30] = "Asg", NodeType1[NodeType1.AsgAdd = 31] = "AsgAdd", NodeType1[NodeType1.AsgSub = 32] = "AsgSub", NodeType1[NodeType1.AsgDiv = 33] = "AsgDiv", NodeType1[NodeType1.AsgMul = 34] = "AsgMul", NodeType1[NodeType1.AsgMod = 35] = "AsgMod", NodeType1[NodeType1.AsgAnd = 36] = "AsgAnd", NodeType1[NodeType1.AsgXor = 37] = "AsgXor", NodeType1[NodeType1.AsgOr = 38] = "AsgOr", NodeType1[NodeType1.AsgLsh = 39] = "AsgLsh", NodeType1[NodeType1.AsgRsh = 40] = "AsgRsh", NodeType1[NodeType1.AsgRs2 = 41] = "AsgRs2", NodeType1[NodeType1.ConditionalExpression = 42] = "ConditionalExpression", NodeType1[NodeType1.LogOr = 43] = "LogOr", NodeType1[NodeType1.LogAnd = 44] = "LogAnd", NodeType1[NodeType1.Or = 45] = "Or", NodeType1[NodeType1.Xor = 46] = "Xor", NodeType1[NodeType1.And = 47] = "And", NodeType1[NodeType1.Eq = 48] = "Eq", NodeType1[NodeType1.Ne = 49] = "Ne", NodeType1[NodeType1.Eqv = 50] = "Eqv", NodeType1[NodeType1.NEqv = 51] = "NEqv", NodeType1[NodeType1.Lt = 52] = "Lt", NodeType1[NodeType1.Le = 53] = "Le", NodeType1[NodeType1.Gt = 54] = "Gt", NodeType1[NodeType1.Ge = 55] = "Ge", NodeType1[NodeType1.Add = 56] = "Add", NodeType1[NodeType1.Sub = 57] = "Sub", NodeType1[NodeType1.Mul = 58] = "Mul", NodeType1[NodeType1.Div = 59] = "Div", NodeType1[NodeType1.Mod = 60] = "Mod", NodeType1[NodeType1.Lsh = 61] = "Lsh", NodeType1[NodeType1.Rsh = 62] = "Rsh", NodeType1[NodeType1.Rs2 = 63] = "Rs2", NodeType1[NodeType1.Not = 64] = "Not", NodeType1[NodeType1.LogNot = 65] = "LogNot", NodeType1[NodeType1.IncPre = 66] = "IncPre", NodeType1[NodeType1.DecPre = 67] = "DecPre", NodeType1[NodeType1.IncPost = 68] = "IncPost", NodeType1[NodeType1.DecPost = 69] = "DecPost", NodeType1[NodeType1.TypeAssertion = 70] = "TypeAssertion", NodeType1[NodeType1.FuncDecl = 71] = "FuncDecl", NodeType1[NodeType1.Member = 72] = "Member", NodeType1[NodeType1.VarDecl = 73] = "VarDecl", NodeType1[NodeType1.ArgDecl = 74] = "ArgDecl", NodeType1[NodeType1.Return = 75] = "Return", NodeType1[NodeType1.Break = 76] = "Break", NodeType1[NodeType1.Continue = 77] = "Continue", NodeType1[NodeType1.Throw = 78] = "Throw", NodeType1[NodeType1.For = 79] = "For", NodeType1[NodeType1.ForIn = 80] = "ForIn", NodeType1[NodeType1.If = 81] = "If", NodeType1[NodeType1.While = 82] = "While", NodeType1[NodeType1.DoWhile = 83] = "DoWhile", NodeType1[NodeType1.Block = 84] = "Block", NodeType1[NodeType1.Case = 85] = "Case", NodeType1[NodeType1.Switch = 86] = "Switch", NodeType1[NodeType1.Try = 87] = "Try", NodeType1[NodeType1.TryCatch = 88] = "TryCatch", NodeType1[NodeType1.TryFinally = 89] = "TryFinally", NodeType1[NodeType1.Finally = 90] = "Finally", NodeType1[NodeType1.Catch = 91] = "Catch", NodeType1[NodeType1.List = 92] = "List", NodeType1[NodeType1.Script = 93] = "Script", NodeType1[NodeType1.ClassDeclaration = 94] = "ClassDeclaration", NodeType1[NodeType1.InterfaceDeclaration = 95] = "InterfaceDeclaration", NodeType1[NodeType1.ModuleDeclaration = 96] = "ModuleDeclaration", NodeType1[NodeType1.ImportDeclaration = 97] = "ImportDeclaration", NodeType1[NodeType1.With = 98] = "With", NodeType1[NodeType1.Label = 99] = "Label", NodeType1[NodeType1.LabeledStatement = 100] = "LabeledStatement", NodeType1[NodeType1.EBStart = 101] = "EBStart", NodeType1[NodeType1.GotoEB = 102] = "GotoEB", NodeType1[NodeType1.EndCode = 103] = "EndCode", NodeType1[NodeType1.Error = 104] = "Error", NodeType1[NodeType1.Comment = 105] = "Comment", NodeType1[NodeType1.Debugger = 106] = "Debugger", NodeType1[NodeType1.GeneralNode = 71] = "GeneralNode", NodeType1[NodeType1.LastAsg = 41] = "LastAsg", TypeScript1.NodeType = NodeType;
+    var NodeType, NodeType;
+    (NodeType = NodeType || (NodeType = {
+    }))[NodeType.None = 0] = "None", NodeType[NodeType.Empty = 1] = "Empty", NodeType[NodeType.EmptyExpr = 2] = "EmptyExpr", NodeType[NodeType.True = 3] = "True", NodeType[NodeType.False = 4] = "False", NodeType[NodeType.This = 5] = "This", NodeType[NodeType.Super = 6] = "Super", NodeType[NodeType.QString = 7] = "QString", NodeType[NodeType.Regex = 8] = "Regex", NodeType[NodeType.Null = 9] = "Null", NodeType[NodeType.ArrayLit = 10] = "ArrayLit", NodeType[NodeType.ObjectLit = 11] = "ObjectLit", NodeType[NodeType.Void = 12] = "Void", NodeType[NodeType.Comma = 13] = "Comma", NodeType[NodeType.Pos = 14] = "Pos", NodeType[NodeType.Neg = 15] = "Neg", NodeType[NodeType.Delete = 16] = "Delete", NodeType[NodeType.Await = 17] = "Await", NodeType[NodeType.In = 18] = "In", NodeType[NodeType.Dot = 19] = "Dot", NodeType[NodeType.From = 20] = "From", NodeType[NodeType.Is = 21] = "Is", NodeType[NodeType.InstOf = 22] = "InstOf", NodeType[NodeType.Typeof = 23] = "Typeof", NodeType[NodeType.NumberLit = 24] = "NumberLit", NodeType[NodeType.Name = 25] = "Name", NodeType[NodeType.TypeRef = 26] = "TypeRef", NodeType[NodeType.Index = 27] = "Index", NodeType[NodeType.Call = 28] = "Call", NodeType[NodeType.New = 29] = "New", NodeType[NodeType.Asg = 30] = "Asg", NodeType[NodeType.AsgAdd = 31] = "AsgAdd", NodeType[NodeType.AsgSub = 32] = "AsgSub", NodeType[NodeType.AsgDiv = 33] = "AsgDiv", NodeType[NodeType.AsgMul = 34] = "AsgMul", NodeType[NodeType.AsgMod = 35] = "AsgMod", NodeType[NodeType.AsgAnd = 36] = "AsgAnd", NodeType[NodeType.AsgXor = 37] = "AsgXor", NodeType[NodeType.AsgOr = 38] = "AsgOr", NodeType[NodeType.AsgLsh = 39] = "AsgLsh", NodeType[NodeType.AsgRsh = 40] = "AsgRsh", NodeType[NodeType.AsgRs2 = 41] = "AsgRs2", NodeType[NodeType.ConditionalExpression = 42] = "ConditionalExpression", NodeType[NodeType.LogOr = 43] = "LogOr", NodeType[NodeType.LogAnd = 44] = "LogAnd", NodeType[NodeType.Or = 45] = "Or", NodeType[NodeType.Xor = 46] = "Xor", NodeType[NodeType.And = 47] = "And", NodeType[NodeType.Eq = 48] = "Eq", NodeType[NodeType.Ne = 49] = "Ne", NodeType[NodeType.Eqv = 50] = "Eqv", NodeType[NodeType.NEqv = 51] = "NEqv", NodeType[NodeType.Lt = 52] = "Lt", NodeType[NodeType.Le = 53] = "Le", NodeType[NodeType.Gt = 54] = "Gt", NodeType[NodeType.Ge = 55] = "Ge", NodeType[NodeType.Add = 56] = "Add", NodeType[NodeType.Sub = 57] = "Sub", NodeType[NodeType.Mul = 58] = "Mul", NodeType[NodeType.Div = 59] = "Div", NodeType[NodeType.Mod = 60] = "Mod", NodeType[NodeType.Lsh = 61] = "Lsh", NodeType[NodeType.Rsh = 62] = "Rsh", NodeType[NodeType.Rs2 = 63] = "Rs2", NodeType[NodeType.Not = 64] = "Not", NodeType[NodeType.LogNot = 65] = "LogNot", NodeType[NodeType.IncPre = 66] = "IncPre", NodeType[NodeType.DecPre = 67] = "DecPre", NodeType[NodeType.IncPost = 68] = "IncPost", NodeType[NodeType.DecPost = 69] = "DecPost", NodeType[NodeType.TypeAssertion = 70] = "TypeAssertion", NodeType[NodeType.FuncDecl = 71] = "FuncDecl", NodeType[NodeType.Member = 72] = "Member", NodeType[NodeType.VarDecl = 73] = "VarDecl", NodeType[NodeType.ArgDecl = 74] = "ArgDecl", NodeType[NodeType.Return = 75] = "Return", NodeType[NodeType.Break = 76] = "Break", NodeType[NodeType.Continue = 77] = "Continue", NodeType[NodeType.Throw = 78] = "Throw", NodeType[NodeType.For = 79] = "For", NodeType[NodeType.ForIn = 80] = "ForIn", NodeType[NodeType.If = 81] = "If", NodeType[NodeType.While = 82] = "While", NodeType[NodeType.DoWhile = 83] = "DoWhile", NodeType[NodeType.Block = 84] = "Block", NodeType[NodeType.Case = 85] = "Case", NodeType[NodeType.Switch = 86] = "Switch", NodeType[NodeType.Try = 87] = "Try", NodeType[NodeType.TryCatch = 88] = "TryCatch", NodeType[NodeType.TryFinally = 89] = "TryFinally", NodeType[NodeType.Finally = 90] = "Finally", NodeType[NodeType.Catch = 91] = "Catch", NodeType[NodeType.List = 92] = "List", NodeType[NodeType.Script = 93] = "Script", NodeType[NodeType.ClassDeclaration = 94] = "ClassDeclaration", NodeType[NodeType.InterfaceDeclaration = 95] = "InterfaceDeclaration", NodeType[NodeType.ModuleDeclaration = 96] = "ModuleDeclaration", NodeType[NodeType.ImportDeclaration = 97] = "ImportDeclaration", NodeType[NodeType.With = 98] = "With", NodeType[NodeType.Label = 99] = "Label", NodeType[NodeType.LabeledStatement = 100] = "LabeledStatement", NodeType[NodeType.EBStart = 101] = "EBStart", NodeType[NodeType.GotoEB = 102] = "GotoEB", NodeType[NodeType.EndCode = 103] = "EndCode", NodeType[NodeType.Error = 104] = "Error", NodeType[NodeType.Comment = 105] = "Comment", NodeType[NodeType.Debugger = 106] = "Debugger", NodeType[NodeType.GeneralNode = FuncDecl] = "GeneralNode", NodeType[NodeType.LastAsg = AsgRs2] = "LastAsg", TypeScript1.NodeType = NodeType;
 }(TypeScript || (TypeScript = {
 }));
diff --git a/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es2015.1.normal/output.js
index b934195b1d8..7851add33df 100644
--- a/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es2015.1.normal/output.js
@@ -1,21 +1,21 @@
 var NumericEnum1;
-(function(NumericEnum11) {
-    NumericEnum11[NumericEnum11["A"] = 0] = "A";
-    NumericEnum11[NumericEnum11["B"] = 1] = "B";
-    NumericEnum11[NumericEnum11["C"] = 2] = "C";
+(function(NumericEnum1) {
+    NumericEnum1[NumericEnum1["A"] = 0] = "A";
+    NumericEnum1[NumericEnum1["B"] = 1] = "B";
+    NumericEnum1[NumericEnum1["C"] = 2] = "C";
 })(NumericEnum1 || (NumericEnum1 = {
 }));
 var NumericEnum2;
-(function(NumericEnum21) {
-    NumericEnum21[NumericEnum21["A"] = 0] = "A";
-    NumericEnum21[NumericEnum21["B"] = 1] = "B";
-    NumericEnum21[NumericEnum21["C"] = 2] = "C";
+(function(NumericEnum2) {
+    NumericEnum2[NumericEnum2["A"] = 0] = "A";
+    NumericEnum2[NumericEnum2["B"] = 1] = "B";
+    NumericEnum2[NumericEnum2["C"] = 2] = "C";
 })(NumericEnum2 || (NumericEnum2 = {
 }));
 var StringEnum1;
-(function(StringEnum11) {
-    StringEnum11["A"] = "Alpha";
-    StringEnum11["B"] = "Beta";
+(function(StringEnum1) {
+    StringEnum1["A"] = "Alpha";
+    StringEnum1["B"] = "Beta";
 })(StringEnum1 || (StringEnum1 = {
 }));
 // All of these should be errors
diff --git a/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es2015.2.minified/output.js
index 2400bfb004c..178cb1dacfb 100644
--- a/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-var NumericEnum1, NumericEnum2, StringEnum1, NumericEnum11, NumericEnum21, StringEnum11;
-(NumericEnum11 = NumericEnum1 || (NumericEnum1 = {
-}))[NumericEnum11.A = 0] = "A", NumericEnum11[NumericEnum11.B = 1] = "B", NumericEnum11[NumericEnum11.C = 2] = "C", (NumericEnum21 = NumericEnum2 || (NumericEnum2 = {
-}))[NumericEnum21.A = 0] = "A", NumericEnum21[NumericEnum21.B = 1] = "B", NumericEnum21[NumericEnum21.C = 2] = "C", (StringEnum11 = StringEnum1 || (StringEnum1 = {
-})).A = "Alpha", StringEnum11.B = "Beta", strMap[0], strMap[0], strMap[0], strMap[0], strMap[NumericEnum1.A], strMap[NumericEnum2.A], strMap[StringEnum1.A], strMap[StringEnum1.A], strMap[NumericEnum1.A], strMap[NumericEnum2.A], strMap[null], strMap.baz = void 0, strMap.qua = void 0, strMap[0] = void 0, strMap[null] = void 0, numMap[0], numMap[0], numMap[0], numMap[NumericEnum1.A], numMap[NumericEnum2.A], symbolMap[s], symbolMap[s] = void 0, nonEmptyStringArray[0], nonEmptyStringArray[1];
+var NumericEnum1, NumericEnum2, StringEnum1, NumericEnum1, NumericEnum2, StringEnum1;
+(NumericEnum1 = NumericEnum1 || (NumericEnum1 = {
+}))[NumericEnum1.A = 0] = "A", NumericEnum1[NumericEnum1.B = 1] = "B", NumericEnum1[NumericEnum1.C = 2] = "C", (NumericEnum2 = NumericEnum2 || (NumericEnum2 = {
+}))[NumericEnum2.A = 0] = "A", NumericEnum2[NumericEnum2.B = 1] = "B", NumericEnum2[NumericEnum2.C = 2] = "C", (StringEnum1 = StringEnum1 || (StringEnum1 = {
+})).A = "Alpha", StringEnum1.B = "Beta", strMap[0], strMap[0], strMap[0], strMap[0], strMap[NumericEnum1.A], strMap[NumericEnum2.A], strMap[StringEnum1.A], strMap[StringEnum1.A], strMap[NumericEnum1.A], strMap[NumericEnum2.A], strMap[null], strMap.baz = void 0, strMap.qua = void 0, strMap[0] = void 0, strMap[null] = void 0, numMap[0], numMap[0], numMap[0], numMap[NumericEnum1.A], numMap[NumericEnum2.A], symbolMap[s], symbolMap[s] = void 0, nonEmptyStringArray[0], nonEmptyStringArray[1];
diff --git a/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es5.1.normal/output.js
index b9e10d5b59c..2da5d54272e 100644
--- a/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es5.1.normal/output.js
@@ -1,21 +1,21 @@
 var NumericEnum1;
-(function(NumericEnum11) {
-    NumericEnum11[NumericEnum11["A"] = 0] = "A";
-    NumericEnum11[NumericEnum11["B"] = 1] = "B";
-    NumericEnum11[NumericEnum11["C"] = 2] = "C";
+(function(NumericEnum1) {
+    NumericEnum1[NumericEnum1["A"] = 0] = "A";
+    NumericEnum1[NumericEnum1["B"] = 1] = "B";
+    NumericEnum1[NumericEnum1["C"] = 2] = "C";
 })(NumericEnum1 || (NumericEnum1 = {
 }));
 var NumericEnum2;
-(function(NumericEnum21) {
-    NumericEnum21[NumericEnum21["A"] = 0] = "A";
-    NumericEnum21[NumericEnum21["B"] = 1] = "B";
-    NumericEnum21[NumericEnum21["C"] = 2] = "C";
+(function(NumericEnum2) {
+    NumericEnum2[NumericEnum2["A"] = 0] = "A";
+    NumericEnum2[NumericEnum2["B"] = 1] = "B";
+    NumericEnum2[NumericEnum2["C"] = 2] = "C";
 })(NumericEnum2 || (NumericEnum2 = {
 }));
 var StringEnum1;
-(function(StringEnum11) {
-    StringEnum11["A"] = "Alpha";
-    StringEnum11["B"] = "Beta";
+(function(StringEnum1) {
+    StringEnum1["A"] = "Alpha";
+    StringEnum1["B"] = "Beta";
 })(StringEnum1 || (StringEnum1 = {
 }));
 // All of these should be errors
diff --git a/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es5.2.minified/output.js
index 8bb50645cfb..178cb1dacfb 100644
--- a/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/pedantic/noUncheckedIndexedAccess/input.ts/es5.2.minified/output.js
@@ -1,5 +1,5 @@
-var NumericEnum1, NumericEnum2, StringEnum1, NumericEnum11, NumericEnum21, StringEnum11;
-(NumericEnum1 = NumericEnum11 || (NumericEnum11 = {
-}))[NumericEnum1.A = 0] = "A", NumericEnum1[NumericEnum1.B = 1] = "B", NumericEnum1[NumericEnum1.C = 2] = "C", (NumericEnum2 = NumericEnum21 || (NumericEnum21 = {
-}))[NumericEnum2.A = 0] = "A", NumericEnum2[NumericEnum2.B = 1] = "B", NumericEnum2[NumericEnum2.C = 2] = "C", (StringEnum1 = StringEnum11 || (StringEnum11 = {
-})).A = "Alpha", StringEnum1.B = "Beta", strMap[0], strMap[0], strMap[0], strMap[0], strMap[NumericEnum11.A], strMap[NumericEnum21.A], strMap[StringEnum11.A], strMap[StringEnum11.A], strMap[NumericEnum11.A], strMap[NumericEnum21.A], strMap[null], strMap.baz = void 0, strMap.qua = void 0, strMap[0] = void 0, strMap[null] = void 0, numMap[0], numMap[0], numMap[0], numMap[NumericEnum11.A], numMap[NumericEnum21.A], symbolMap[s], symbolMap[s] = void 0, nonEmptyStringArray[0], nonEmptyStringArray[1];
+var NumericEnum1, NumericEnum2, StringEnum1, NumericEnum1, NumericEnum2, StringEnum1;
+(NumericEnum1 = NumericEnum1 || (NumericEnum1 = {
+}))[NumericEnum1.A = 0] = "A", NumericEnum1[NumericEnum1.B = 1] = "B", NumericEnum1[NumericEnum1.C = 2] = "C", (NumericEnum2 = NumericEnum2 || (NumericEnum2 = {
+}))[NumericEnum2.A = 0] = "A", NumericEnum2[NumericEnum2.B = 1] = "B", NumericEnum2[NumericEnum2.C = 2] = "C", (StringEnum1 = StringEnum1 || (StringEnum1 = {
+})).A = "Alpha", StringEnum1.B = "Beta", strMap[0], strMap[0], strMap[0], strMap[0], strMap[NumericEnum1.A], strMap[NumericEnum2.A], strMap[StringEnum1.A], strMap[StringEnum1.A], strMap[NumericEnum1.A], strMap[NumericEnum2.A], strMap[null], strMap.baz = void 0, strMap.qua = void 0, strMap[0] = void 0, strMap[null] = void 0, numMap[0], numMap[0], numMap[0], numMap[NumericEnum1.A], numMap[NumericEnum2.A], symbolMap[s], symbolMap[s] = void 0, nonEmptyStringArray[0], nonEmptyStringArray[1];
diff --git a/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es2015.1.normal/output.js
index 4f40eb24666..45d7ada7db0 100644
--- a/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es2015.1.normal/output.js
@@ -1,6 +1,6 @@
 export var CodeGenTarget;
-(function(CodeGenTarget1) {
-    CodeGenTarget1[CodeGenTarget1["ES3"] = 0] = "ES3";
-    CodeGenTarget1[CodeGenTarget1["ES5"] = 1] = "ES5";
+(function(CodeGenTarget) {
+    CodeGenTarget[CodeGenTarget["ES3"] = 0] = "ES3";
+    CodeGenTarget[CodeGenTarget["ES5"] = 1] = "ES5";
 })(CodeGenTarget || (CodeGenTarget = {
 }));
diff --git a/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es2015.2.minified/output.js
index 42f57e7e266..243f274ae21 100644
--- a/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var CodeGenTarget, CodeGenTarget1;
-(CodeGenTarget1 = CodeGenTarget || (CodeGenTarget = {
-}))[CodeGenTarget1.ES3 = 0] = "ES3", CodeGenTarget1[CodeGenTarget1.ES5 = 1] = "ES5";
+var CodeGenTarget, CodeGenTarget;
+(CodeGenTarget = CodeGenTarget || (CodeGenTarget = {
+}))[CodeGenTarget.ES3 = 0] = "ES3", CodeGenTarget[CodeGenTarget.ES5 = 1] = "ES5";
diff --git a/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es5.1.normal/output.js
index 4f40eb24666..45d7ada7db0 100644
--- a/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es5.1.normal/output.js
@@ -1,6 +1,6 @@
 export var CodeGenTarget;
-(function(CodeGenTarget1) {
-    CodeGenTarget1[CodeGenTarget1["ES3"] = 0] = "ES3";
-    CodeGenTarget1[CodeGenTarget1["ES5"] = 1] = "ES5";
+(function(CodeGenTarget) {
+    CodeGenTarget[CodeGenTarget["ES3"] = 0] = "ES3";
+    CodeGenTarget[CodeGenTarget["ES5"] = 1] = "ES5";
 })(CodeGenTarget || (CodeGenTarget = {
 }));
diff --git a/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es5.2.minified/output.js
index 42f57e7e266..243f274ae21 100644
--- a/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/scanner/ecmascript5/scannerEnum1/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var CodeGenTarget, CodeGenTarget1;
-(CodeGenTarget1 = CodeGenTarget || (CodeGenTarget = {
-}))[CodeGenTarget1.ES3 = 0] = "ES3", CodeGenTarget1[CodeGenTarget1.ES5 = 1] = "ES5";
+var CodeGenTarget, CodeGenTarget;
+(CodeGenTarget = CodeGenTarget || (CodeGenTarget = {
+}))[CodeGenTarget.ES3 = 0] = "ES3", CodeGenTarget[CodeGenTarget.ES5 = 1] = "ES5";
diff --git a/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es2015.1.normal/output.js
index ed7d1468bfa..bb8460f6823 100644
--- a/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es2015.1.normal/output.js
@@ -97,9 +97,9 @@ for(var x in M){
 for(var x in M.X){
 }
 var Color;
-(function(Color1) {
-    Color1[Color1["Red"] = 0] = "Red";
-    Color1[Color1["Blue"] = 1] = "Blue";
+(function(Color) {
+    Color[Color["Red"] = 0] = "Red";
+    Color[Color["Blue"] = 1] = "Blue";
 })(Color || (Color = {
 }));
 for(var x in Color){
diff --git a/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es2015.2.minified/output.js
index b3140b15187..96a2d5513a4 100644
--- a/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var aString, anAny, c, d, e, i, M, Color, Color1;
+var aString, anAny, c, d, e, i, M, Color, Color;
 for(aString in {
 });
 for(anAny in {
@@ -34,6 +34,6 @@ for(var x in (M || (M = {
 })).X = class {
 }, M);
 for(var x in M.X);
-for(var x in (Color1 = Color || (Color = {
-}))[Color1.Red = 0] = "Red", Color1[Color1.Blue = 1] = "Blue", Color);
+for(var x in (Color = Color || (Color = {
+}))[Color.Red = 0] = "Red", Color[Color.Blue = 1] = "Blue", Color);
 for(var x in Color.Blue);
diff --git a/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es5.1.normal/output.js
index b172830d2d4..061bb2f461c 100644
--- a/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es5.1.normal/output.js
@@ -235,9 +235,9 @@ for(var x in M){
 for(var x in M.X){
 }
 var Color;
-(function(Color1) {
-    Color1[Color1["Red"] = 0] = "Red";
-    Color1[Color1["Blue"] = 1] = "Blue";
+(function(Color) {
+    Color[Color["Red"] = 0] = "Red";
+    Color[Color["Blue"] = 1] = "Blue";
 })(Color || (Color = {
 }));
 for(var x in Color){
diff --git a/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es5.2.minified/output.js
index e64005fb8a3..308805872be 100644
--- a/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/statements/for-inStatements/for-inStatements/input.ts/es5.2.minified/output.js
@@ -64,7 +64,7 @@ for(var x in function(x1) {
 for(var x in function(x2, y) {
     return x2 + y;
 });
-var Color, aString, anAny, c, d, e, i, M, Color1, A = function() {
+var Color, aString, anAny, c, d, e, i, M, Color, A = function() {
     "use strict";
     function A() {
         _classCallCheck(this, A);
@@ -153,6 +153,6 @@ for(var x in !function(M1) {
 }(M || (M = {
 })), M);
 for(var x in M.X);
-for(var x in (Color = Color1 || (Color1 = {
-}))[Color.Red = 0] = "Red", Color[Color.Blue = 1] = "Blue", Color1);
-for(var x in Color1.Blue);
+for(var x in (Color = Color || (Color = {
+}))[Color.Red = 0] = "Red", Color[Color.Blue = 1] = "Blue", Color);
+for(var x in Color.Blue);
diff --git a/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es2015.1.normal/output.js
index cd492fdf167..37292b07537 100644
--- a/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es2015.1.normal/output.js
@@ -9,8 +9,8 @@ e = x;
 var f = undefined;
 f = x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var g = x;
diff --git a/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es2015.2.minified/output.js
index c7083cc19e2..2c976940bf3 100644
--- a/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var x, E, M, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E.A, (M || (M = {
+var x, E, M, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E.A, (M || (M = {
 })).foo = 1, M = x;
diff --git a/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es5.1.normal/output.js
index 6e0cf225d1b..1852bf417fe 100644
--- a/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es5.1.normal/output.js
@@ -14,8 +14,8 @@ e = x;
 var f = undefined;
 f = x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var g = x;
diff --git a/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es5.2.minified/output.js
index ccb64d77bba..43792b36778 100644
--- a/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/any/assignAnyToEveryType/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-var x, E, M, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E.A;
+var x, E, M, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E.A;
 var C = function() {
     "use strict";
     !function(instance, Constructor) {
diff --git a/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es2015.1.normal/output.js
index 1e50030eeb8..7461112be3c 100644
--- a/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es2015.1.normal/output.js
@@ -16,8 +16,8 @@ x = e;
 var e2;
 x = e2;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 x = E.A;
diff --git a/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es2015.2.minified/output.js
index 47941337af4..4dac4549ce1 100644
--- a/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es5.1.normal/output.js
index 9ba3dc3c891..01b607da7a6 100644
--- a/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es5.1.normal/output.js
@@ -21,8 +21,8 @@ x = e;
 var e2;
 x = e2;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 x = E.A;
diff --git a/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es5.2.minified/output.js
index a17c79ff03c..d75c50e764f 100644
--- a/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/any/assignEveryTypeToAny/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
-var E, E1, C = function() {
+(E = E || (E = {
+}))[E.A = 0] = "A";
+var E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
diff --git a/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es2015.1.normal/output.js
index 892885f6814..ebdae1a11df 100644
--- a/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es2015.1.normal/output.js
@@ -1,12 +1,12 @@
 var // @strict
 E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
-    E1[E1["D"] = 3] = "D";
-    E1[E1["E"] = 4] = "E";
-    E1[E1["F"] = 5] = "F";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
+    E[E["D"] = 3] = "D";
+    E[E["E"] = 4] = "E";
+    E[E["F"] = 5] = "F";
 })(E || (E = {
 }));
 let x0; // 'a' | 'b' | 'c'
diff --git a/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es2015.2.minified/output.js
index c36db5a9d35..fa1613981de 100644
--- a/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", E1[E1.D = 3] = "D", E1[E1.E = 4] = "E", E1[E1.F = 5] = "F";
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", E[E.D = 3] = "D", E[E.E = 4] = "E", E[E.F = 5] = "F";
diff --git a/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es5.1.normal/output.js
index bc87052f0e9..342ab87e926 100644
--- a/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es5.1.normal/output.js
@@ -1,12 +1,12 @@
 var // @strict
 E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
-    E1[E1["D"] = 3] = "D";
-    E1[E1["E"] = 4] = "E";
-    E1[E1["F"] = 5] = "F";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
+    E[E["D"] = 3] = "D";
+    E[E["E"] = 4] = "E";
+    E[E["F"] = 5] = "F";
 })(E || (E = {
 }));
 var x0; // 'a' | 'b' | 'c'
diff --git a/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es5.2.minified/output.js
index c36db5a9d35..fa1613981de 100644
--- a/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/intersection/intersectionOfUnionOfUnitTypes/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C", E1[E1.D = 3] = "D", E1[E1.E = 4] = "E", E1[E1.F = 5] = "F";
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", E[E.D = 3] = "D", E[E.E = 4] = "E", E[E.F = 5] = "F";
diff --git a/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es2015.1.normal/output.js
index 2db6b2ee048..80c8946002a 100644
--- a/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es2015.1.normal/output.js
@@ -9,10 +9,10 @@ class Item {
 class Options {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 function getProperty(obj, key) {
@@ -422,9 +422,9 @@ function f3(t, k, tk) {
     }
 }
 var Flag;
-(function(Flag1) {
-    Flag1["FLAG_1"] = "flag_1";
-    Flag1["FLAG_2"] = "flag_2";
+(function(Flag) {
+    Flag["FLAG_1"] = "flag_1";
+    Flag["FLAG_2"] = "flag_2";
 })(Flag || (Flag = {
 }));
 function getFlagsFromSimpleRecord(record, flags) {
diff --git a/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es2015.2.minified/output.js
index 123ff70002d..5a0f716232e 100644
--- a/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-var E, E1, Flag, Flag1;
-(E = E1 || (E1 = {
+var E, E, Flag, Flag;
+(E = E || (E = {
 }))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C", one(()=>{
 }), on({
     test: ()=>{
@@ -30,5 +30,5 @@ new class extends SampleClass {
         }));
     }
 }({
-}), (Flag1 = Flag || (Flag = {
-})).FLAG_1 = "flag_1", Flag1.FLAG_2 = "flag_2";
+}), (Flag = Flag || (Flag = {
+})).FLAG_1 = "flag_1", Flag.FLAG_2 = "flag_2";
diff --git a/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es5.1.normal/output.js
index 2a1d9fb54e0..05664480826 100644
--- a/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es5.1.normal/output.js
@@ -123,10 +123,10 @@ var Options = function Options() {
     _classCallCheck(this, Options);
 };
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 function getProperty(obj, key) {
@@ -676,9 +676,9 @@ function f3(t, k, tk) {
     }
 }
 var Flag;
-(function(Flag1) {
-    Flag1["FLAG_1"] = "flag_1";
-    Flag1["FLAG_2"] = "flag_2";
+(function(Flag) {
+    Flag["FLAG_1"] = "flag_1";
+    Flag["FLAG_2"] = "flag_2";
 })(Flag || (Flag = {
 }));
 function getFlagsFromSimpleRecord(record, flags) {
diff --git a/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es5.2.minified/output.js
index 21e3018ffc8..9360fbe1ab8 100644
--- a/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/keyof/keyofAndIndexedAccess/input.ts/es5.2.minified/output.js
@@ -54,7 +54,7 @@ function _createSuper(Derived) {
         })(self);
     };
 }
-var Flag, E, Flag1, E1, Shape = function() {
+var Flag, E, Flag, E, Shape = function() {
     "use strict";
     _classCallCheck(this, Shape);
 }, TaggedShape = function(Shape1) {
@@ -78,8 +78,8 @@ function getProperty(obj, key) {
 function setProperty(obj, key, value) {
     obj[key] = value;
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C";
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C";
 var Component = function() {
     "use strict";
     function Component() {
@@ -244,7 +244,7 @@ var A = function() {
     ]), AnotherSampleClass;
 }(SampleClass);
 new AnotherSampleClass({
-}), (Flag = Flag1 || (Flag1 = {
+}), (Flag = Flag || (Flag = {
 })).FLAG_1 = "flag_1", Flag.FLAG_2 = "flag_2";
 var Unbounded = function() {
     "use strict";
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es2015.1.normal/output.js
index 292d7da4967..4ecb56a618d 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var Choice;
-(function(Choice1) {
-    Choice1[Choice1["Unknown"] = 0] = "Unknown";
-    Choice1[Choice1["Yes"] = 1] = "Yes";
-    Choice1[Choice1["No"] = 2] = "No";
+(function(Choice) {
+    Choice[Choice["Unknown"] = 0] = "Unknown";
+    Choice[Choice["Yes"] = 1] = "Yes";
+    Choice[Choice["No"] = 2] = "No";
 })(Choice || (Choice = {
 }));
 function f1() {
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es2015.2.minified/output.js
index dab587ffd5b..eb31f078dc0 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-}))[Choice1.Unknown = 0] = "Unknown", Choice1[Choice1.Yes = 1] = "Yes", Choice1[Choice1.No = 2] = "No";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+}))[Choice.Unknown = 0] = "Unknown", Choice[Choice.Yes = 1] = "Yes", Choice[Choice.No = 2] = "No";
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es5.1.normal/output.js
index 292d7da4967..4ecb56a618d 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var Choice;
-(function(Choice1) {
-    Choice1[Choice1["Unknown"] = 0] = "Unknown";
-    Choice1[Choice1["Yes"] = 1] = "Yes";
-    Choice1[Choice1["No"] = 2] = "No";
+(function(Choice) {
+    Choice[Choice["Unknown"] = 0] = "Unknown";
+    Choice[Choice["Yes"] = 1] = "Yes";
+    Choice[Choice["No"] = 2] = "No";
 })(Choice || (Choice = {
 }));
 function f1() {
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es5.2.minified/output.js
index dab587ffd5b..eb31f078dc0 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes1/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-}))[Choice1.Unknown = 0] = "Unknown", Choice1[Choice1.Yes = 1] = "Yes", Choice1[Choice1.No = 2] = "No";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+}))[Choice.Unknown = 0] = "Unknown", Choice[Choice.Yes = 1] = "Yes", Choice[Choice.No = 2] = "No";
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es2015.1.normal/output.js
index 1230b425641..05ed7049006 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // @strictNullChecks: true
 Choice;
-(function(Choice1) {
-    Choice1[Choice1["Unknown"] = 0] = "Unknown";
-    Choice1[Choice1["Yes"] = 1] = "Yes";
-    Choice1[Choice1["No"] = 2] = "No";
+(function(Choice) {
+    Choice[Choice["Unknown"] = 0] = "Unknown";
+    Choice[Choice["Yes"] = 1] = "Yes";
+    Choice[Choice["No"] = 2] = "No";
 })(Choice || (Choice = {
 }));
 function f1() {
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es2015.2.minified/output.js
index dab587ffd5b..eb31f078dc0 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-}))[Choice1.Unknown = 0] = "Unknown", Choice1[Choice1.Yes = 1] = "Yes", Choice1[Choice1.No = 2] = "No";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+}))[Choice.Unknown = 0] = "Unknown", Choice[Choice.Yes = 1] = "Yes", Choice[Choice.No = 2] = "No";
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es5.1.normal/output.js
index 1230b425641..05ed7049006 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // @strictNullChecks: true
 Choice;
-(function(Choice1) {
-    Choice1[Choice1["Unknown"] = 0] = "Unknown";
-    Choice1[Choice1["Yes"] = 1] = "Yes";
-    Choice1[Choice1["No"] = 2] = "No";
+(function(Choice) {
+    Choice[Choice["Unknown"] = 0] = "Unknown";
+    Choice[Choice["Yes"] = 1] = "Yes";
+    Choice[Choice["No"] = 2] = "No";
 })(Choice || (Choice = {
 }));
 function f1() {
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es5.2.minified/output.js
index dab587ffd5b..eb31f078dc0 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes2/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-}))[Choice1.Unknown = 0] = "Unknown", Choice1[Choice1.Yes = 1] = "Yes", Choice1[Choice1.No = 2] = "No";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+}))[Choice.Unknown = 0] = "Unknown", Choice[Choice.Yes = 1] = "Yes", Choice[Choice.No = 2] = "No";
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es2015.1.normal/output.js
index 0421f2214a5..0d55eba5f8a 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var Choice;
-(function(Choice1) {
-    Choice1[Choice1["Unknown"] = 0] = "Unknown";
-    Choice1[Choice1["Yes"] = 1] = "Yes";
-    Choice1[Choice1["No"] = 2] = "No";
+(function(Choice) {
+    Choice[Choice["Unknown"] = 0] = "Unknown";
+    Choice[Choice["Yes"] = 1] = "Yes";
+    Choice[Choice["No"] = 2] = "No";
 })(Choice || (Choice = {
 }));
 function f1(a, b, c, d) {
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es2015.2.minified/output.js
index dab587ffd5b..eb31f078dc0 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-}))[Choice1.Unknown = 0] = "Unknown", Choice1[Choice1.Yes = 1] = "Yes", Choice1[Choice1.No = 2] = "No";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+}))[Choice.Unknown = 0] = "Unknown", Choice[Choice.Yes = 1] = "Yes", Choice[Choice.No = 2] = "No";
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es5.1.normal/output.js
index 0421f2214a5..0d55eba5f8a 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var Choice;
-(function(Choice1) {
-    Choice1[Choice1["Unknown"] = 0] = "Unknown";
-    Choice1[Choice1["Yes"] = 1] = "Yes";
-    Choice1[Choice1["No"] = 2] = "No";
+(function(Choice) {
+    Choice[Choice["Unknown"] = 0] = "Unknown";
+    Choice[Choice["Yes"] = 1] = "Yes";
+    Choice[Choice["No"] = 2] = "No";
 })(Choice || (Choice = {
 }));
 function f1(a, b, c, d) {
diff --git a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es5.2.minified/output.js
index dab587ffd5b..eb31f078dc0 100644
--- a/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/enumLiteralTypes3/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-}))[Choice1.Unknown = 0] = "Unknown", Choice1[Choice1.Yes = 1] = "Yes", Choice1[Choice1.No = 2] = "No";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+}))[Choice.Unknown = 0] = "Unknown", Choice[Choice.Yes = 1] = "Yes", Choice[Choice.No = 2] = "No";
diff --git a/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es2015.1.normal/output.js
index b119ca73b70..a30759fccca 100644
--- a/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es2015.1.normal/output.js
@@ -168,9 +168,9 @@ function test(obj) {
     }, rest);
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
 })(E || (E = {
 }));
 const a = f(E.A);
diff --git a/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es2015.2.minified/output.js
index c2b97029287..6f309f919cf 100644
--- a/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, E1;
+var E, E;
 export function Set(...keys1) {
     const result = {
     };
@@ -13,5 +13,5 @@ export const langCodes = keys(langCodeSet);
 langCodes.map((code)=>({
         code
     })
-), (E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", f(E.A);
+), (E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", f(E.A);
diff --git a/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es5.1.normal/output.js
index 03cbb344943..02e2b372a25 100644
--- a/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es5.1.normal/output.js
@@ -173,9 +173,9 @@ function test(obj) {
     }, rest);
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
 })(E || (E = {
 }));
 var a = f(E.A);
diff --git a/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es5.2.minified/output.js
index 6ddfe64bd5d..638ceed53d6 100644
--- a/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/literalTypeWidening/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, E1;
+var E, E;
 export function Set() {
     for(var _len = arguments.length, keys1 = new Array(_len), _key = 0; _key < _len; _key++)keys1[_key] = arguments[_key];
     var result = {
@@ -16,5 +16,5 @@ langCodes.map(function(code) {
     return {
         code: code
     };
-}), (E = E1 || (E1 = {
-}))[E.A = 0] = "A", E[E.B = 1] = "B", f(E1.A);
+}), (E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", f(E.A);
diff --git a/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es2015.1.normal/output.js
index af0ca4019f1..dc242d433a1 100644
--- a/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 let cond;
diff --git a/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es2015.2.minified/output.js
index 8b15b6d2758..2a4ce99f2a7 100644
--- a/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", E1[E1.C = 2] = "C";
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C";
 const a = [
     1,
     2
diff --git a/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es5.1.normal/output.js
index 90aa556f6df..d29572b0f83 100644
--- a/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es5.1.normal/output.js
@@ -18,10 +18,10 @@ function _createClass(Constructor, protoProps, staticProps) {
     return Constructor;
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
-    E1[E1["C"] = 2] = "C";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
+    E[E["C"] = 2] = "C";
 })(E || (E = {
 }));
 var cond;
diff --git a/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es5.2.minified/output.js
index a1d621f01f8..faea7e352b3 100644
--- a/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/literalTypes2/input.ts/es5.2.minified/output.js
@@ -7,11 +7,11 @@ function _defineProperties(target, props) {
         descriptor.enumerable = descriptor.enumerable || !1, descriptor.configurable = !0, "value" in descriptor && (descriptor.writable = !0), Object.defineProperty(target, descriptor.key, descriptor);
     }
 }
-(E = E1 || (E1 = {
+(E = E || (E = {
 }))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C";
-var E, E1, cond, C1 = function() {
+var E, E, cond, C1 = function() {
     "use strict";
-    _classCallCheck(this, C1), this.x1 = 1, this.x2 = -123, this.x3 = 7, this.x4 = "abc", this.x5 = "", this.x6 = "abcdef", this.x7 = !0, this.x8 = E1.A, this.c1 = 1, this.c2 = -123, this.c3 = 7, this.c4 = "abc", this.c5 = "", this.c6 = "abcdef", this.c7 = !0, this.c8 = E1.A;
+    _classCallCheck(this, C1), this.x1 = 1, this.x2 = -123, this.x3 = 7, this.x4 = "abc", this.x5 = "", this.x6 = "abcdef", this.x7 = !0, this.x8 = E.A, this.c1 = 1, this.c2 = -123, this.c3 = 7, this.c4 = "abc", this.c5 = "", this.c6 = "abcdef", this.c7 = !0, this.c8 = E.A;
 }, C2 = function() {
     "use strict";
     var Constructor, protoProps, staticProps;
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es2015.1.normal/output.js
index 40357a49329..671a75aa065 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var Choice;
-(function(Choice1) {
-    Choice1["Unknown"] = "";
-    Choice1["Yes"] = "yes";
-    Choice1["No"] = "no";
+(function(Choice) {
+    Choice["Unknown"] = "";
+    Choice["Yes"] = "yes";
+    Choice["No"] = "no";
 })(Choice || (Choice = {
 }));
 function f1() {
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es2015.2.minified/output.js
index ffc4ae4446d..e06d6e85103 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-})).Unknown = "", Choice1.Yes = "yes", Choice1.No = "no";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+})).Unknown = "", Choice.Yes = "yes", Choice.No = "no";
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es5.1.normal/output.js
index 40357a49329..671a75aa065 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var Choice;
-(function(Choice1) {
-    Choice1["Unknown"] = "";
-    Choice1["Yes"] = "yes";
-    Choice1["No"] = "no";
+(function(Choice) {
+    Choice["Unknown"] = "";
+    Choice["Yes"] = "yes";
+    Choice["No"] = "no";
 })(Choice || (Choice = {
 }));
 function f1() {
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es5.2.minified/output.js
index ffc4ae4446d..e06d6e85103 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes1/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-})).Unknown = "", Choice1.Yes = "yes", Choice1.No = "no";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+})).Unknown = "", Choice.Yes = "yes", Choice.No = "no";
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es2015.1.normal/output.js
index 504d107439a..b98fc097717 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es2015.1.normal/output.js
@@ -1,9 +1,9 @@
 var // @strictNullChecks: true
 Choice;
-(function(Choice1) {
-    Choice1["Unknown"] = "";
-    Choice1["Yes"] = "yes";
-    Choice1["No"] = "no";
+(function(Choice) {
+    Choice["Unknown"] = "";
+    Choice["Yes"] = "yes";
+    Choice["No"] = "no";
 })(Choice || (Choice = {
 }));
 function f1() {
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es2015.2.minified/output.js
index ffc4ae4446d..e06d6e85103 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-})).Unknown = "", Choice1.Yes = "yes", Choice1.No = "no";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+})).Unknown = "", Choice.Yes = "yes", Choice.No = "no";
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es5.1.normal/output.js
index 504d107439a..b98fc097717 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es5.1.normal/output.js
@@ -1,9 +1,9 @@
 var // @strictNullChecks: true
 Choice;
-(function(Choice1) {
-    Choice1["Unknown"] = "";
-    Choice1["Yes"] = "yes";
-    Choice1["No"] = "no";
+(function(Choice) {
+    Choice["Unknown"] = "";
+    Choice["Yes"] = "yes";
+    Choice["No"] = "no";
 })(Choice || (Choice = {
 }));
 function f1() {
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es5.2.minified/output.js
index ffc4ae4446d..e06d6e85103 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes2/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-})).Unknown = "", Choice1.Yes = "yes", Choice1.No = "no";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+})).Unknown = "", Choice.Yes = "yes", Choice.No = "no";
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es2015.1.normal/output.js
index 226922cee68..e4437f65629 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es2015.1.normal/output.js
@@ -1,8 +1,8 @@
 var Choice;
-(function(Choice1) {
-    Choice1["Unknown"] = "";
-    Choice1["Yes"] = "yes";
-    Choice1["No"] = "no";
+(function(Choice) {
+    Choice["Unknown"] = "";
+    Choice["Yes"] = "yes";
+    Choice["No"] = "no";
 })(Choice || (Choice = {
 }));
 function f1(a, b, c, d) {
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es2015.2.minified/output.js
index ffc4ae4446d..e06d6e85103 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-})).Unknown = "", Choice1.Yes = "yes", Choice1.No = "no";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+})).Unknown = "", Choice.Yes = "yes", Choice.No = "no";
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es5.1.normal/output.js
index 226922cee68..e4437f65629 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es5.1.normal/output.js
@@ -1,8 +1,8 @@
 var Choice;
-(function(Choice1) {
-    Choice1["Unknown"] = "";
-    Choice1["Yes"] = "yes";
-    Choice1["No"] = "no";
+(function(Choice) {
+    Choice["Unknown"] = "";
+    Choice["Yes"] = "yes";
+    Choice["No"] = "no";
 })(Choice || (Choice = {
 }));
 function f1(a, b, c, d) {
diff --git a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es5.2.minified/output.js
index ffc4ae4446d..e06d6e85103 100644
--- a/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/literal/stringEnumLiteralTypes3/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var Choice, Choice1;
-(Choice1 = Choice || (Choice = {
-})).Unknown = "", Choice1.Yes = "yes", Choice1.No = "no";
+var Choice, Choice;
+(Choice = Choice || (Choice = {
+})).Unknown = "", Choice.Yes = "yes", Choice.No = "no";
diff --git a/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es2015.1.normal/output.js
index 7aa8c8406f0..624212aa052 100644
--- a/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es2015.1.normal/output.js
@@ -1,5 +1,6 @@
 // @target: es5
 function f1() {
+    let E;
     (function(E) {
         E[E["A"] = 0] = "A";
         E[E["B"] = 1] = "B";
@@ -17,6 +18,7 @@ function f1() {
 }
 function f2() {
     function g() {
+        let E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
@@ -36,6 +38,7 @@ function f2() {
 }
 function f3(b) {
     if (true) {
+        let E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
@@ -65,6 +68,7 @@ function f3(b) {
 }
 function f5() {
     var z1 = function() {
+        let E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
@@ -76,6 +80,7 @@ function f5() {
         return new C();
     };
     var z2 = ()=>{
+        let E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
@@ -89,6 +94,7 @@ function f5() {
 }
 class A {
     m() {
+        let E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
@@ -100,6 +106,7 @@ class A {
         return new C();
     }
     get p() {
+        let E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
@@ -111,12 +118,12 @@ class A {
         return new C();
     }
     constructor(){
-        var E1;
+        let E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
             E[E["C"] = 2] = "C";
-        })(E1 || (E1 = {
+        })(E || (E = {
         }));
         class C {
         }
diff --git a/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es5.1.normal/output.js
index 6566d4fe886..6d61cd6788a 100644
--- a/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es5.1.normal/output.js
@@ -85,6 +85,7 @@ function _createSuper(Derived) {
 }
 // @target: es5
 function f1() {
+    var E;
     (function(E) {
         E[E["A"] = 0] = "A";
         E[E["B"] = 1] = "B";
@@ -104,6 +105,7 @@ function f1() {
 }
 function f2() {
     var g = function g() {
+        var E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
@@ -125,6 +127,7 @@ function f2() {
 }
 function f3(b) {
     if (true) {
+        var E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
@@ -158,6 +161,7 @@ function f3(b) {
 }
 function f5() {
     var z1 = function z1() {
+        var E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
@@ -171,6 +175,7 @@ function f5() {
         return new C();
     };
     var z2 = function() {
+        var E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
@@ -188,12 +193,12 @@ var A = /*#__PURE__*/ function() {
     "use strict";
     function A() {
         _classCallCheck(this, A);
-        var E1;
+        var E;
         (function(E) {
             E[E["A"] = 0] = "A";
             E[E["B"] = 1] = "B";
             E[E["C"] = 2] = "C";
-        })(E1 || (E1 = {
+        })(E || (E = {
         }));
         var C = function C() {
             _classCallCheck(this, C);
@@ -203,6 +208,7 @@ var A = /*#__PURE__*/ function() {
         {
             key: "m",
             value: function m() {
+                var E;
                 (function(E) {
                     E[E["A"] = 0] = "A";
                     E[E["B"] = 1] = "B";
@@ -218,6 +224,7 @@ var A = /*#__PURE__*/ function() {
         {
             key: "p",
             get: function get() {
+                var E;
                 (function(E) {
                     E[E["A"] = 0] = "A";
                     E[E["B"] = 1] = "B";
diff --git a/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es5.2.minified/output.js
index 61a7a638dae..933f5a4ec4b 100644
--- a/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/localTypes/localTypes1/input.ts/es5.2.minified/output.js
@@ -22,9 +22,9 @@ var A = function() {
     var Constructor, protoProps, staticProps;
     function A() {
         var E;
-        _classCallCheck(this, A), (E = E1 || (E1 = {
+        _classCallCheck(this, A), (E = E || (E = {
         }))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C";
-        var E1, C = function() {
+        var E, C = function() {
             _classCallCheck(this, C);
         };
     }
@@ -32,9 +32,9 @@ var A = function() {
         {
             key: "m",
             value: function() {
-                var E2;
-                (E2 = E || (E = {
-                }))[E2.A = 0] = "A", E2[E2.B = 1] = "B", E2[E2.C = 2] = "C";
+                var E, E;
+                (E = E || (E = {
+                }))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C";
                 var C = function() {
                     _classCallCheck(this, C);
                 };
@@ -44,9 +44,9 @@ var A = function() {
         {
             key: "p",
             get: function() {
-                var E3;
-                (E3 = E || (E = {
-                }))[E3.A = 0] = "A", E3[E3.B = 1] = "B", E3[E3.C = 2] = "C";
+                var E, E;
+                (E = E || (E = {
+                }))[E.A = 0] = "A", E[E.B = 1] = "B", E[E.C = 2] = "C";
                 var C = function() {
                     _classCallCheck(this, C);
                 };
diff --git a/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es2015.1.normal/output.js
index 6550c6c12f9..06bd6aa230e 100644
--- a/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es2015.1.normal/output.js
@@ -1,13 +1,13 @@
 var // #37859
 TerrestrialAnimalTypes;
-(function(TerrestrialAnimalTypes1) {
-    TerrestrialAnimalTypes1["CAT"] = "cat";
-    TerrestrialAnimalTypes1["DOG"] = "dog";
+(function(TerrestrialAnimalTypes) {
+    TerrestrialAnimalTypes["CAT"] = "cat";
+    TerrestrialAnimalTypes["DOG"] = "dog";
 })(TerrestrialAnimalTypes || (TerrestrialAnimalTypes = {
 }));
 var AlienAnimalTypes;
-(function(AlienAnimalTypes1) {
-    AlienAnimalTypes1["CAT"] = "cat";
+(function(AlienAnimalTypes) {
+    AlienAnimalTypes["CAT"] = "cat";
 })(AlienAnimalTypes || (AlienAnimalTypes = {
 }));
 const catMap = {
diff --git a/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es2015.2.minified/output.js
index f47d8a8f592..377ac6bacea 100644
--- a/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var TerrestrialAnimalTypes, AlienAnimalTypes, TerrestrialAnimalTypes1;
-(TerrestrialAnimalTypes1 = TerrestrialAnimalTypes || (TerrestrialAnimalTypes = {
-})).CAT = "cat", TerrestrialAnimalTypes1.DOG = "dog", (AlienAnimalTypes || (AlienAnimalTypes = {
+var TerrestrialAnimalTypes, AlienAnimalTypes, TerrestrialAnimalTypes, AlienAnimalTypes;
+(TerrestrialAnimalTypes = TerrestrialAnimalTypes || (TerrestrialAnimalTypes = {
+})).CAT = "cat", TerrestrialAnimalTypes.DOG = "dog", (AlienAnimalTypes = AlienAnimalTypes || (AlienAnimalTypes = {
 })).CAT = "cat", TerrestrialAnimalTypes.CAT, AlienAnimalTypes.CAT;
diff --git a/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es5.1.normal/output.js
index c0d06e18f2e..e7539ccc2d3 100644
--- a/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es5.1.normal/output.js
@@ -1,13 +1,13 @@
 var // #37859
 TerrestrialAnimalTypes;
-(function(TerrestrialAnimalTypes1) {
-    TerrestrialAnimalTypes1["CAT"] = "cat";
-    TerrestrialAnimalTypes1["DOG"] = "dog";
+(function(TerrestrialAnimalTypes) {
+    TerrestrialAnimalTypes["CAT"] = "cat";
+    TerrestrialAnimalTypes["DOG"] = "dog";
 })(TerrestrialAnimalTypes || (TerrestrialAnimalTypes = {
 }));
 var AlienAnimalTypes;
-(function(AlienAnimalTypes1) {
-    AlienAnimalTypes1["CAT"] = "cat";
+(function(AlienAnimalTypes) {
+    AlienAnimalTypes["CAT"] = "cat";
 })(AlienAnimalTypes || (AlienAnimalTypes = {
 }));
 var catMap = {
diff --git a/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es5.2.minified/output.js
index 311834408c0..377ac6bacea 100644
--- a/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/mapped/mappedTypeOverlappingStringEnumKeys/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var TerrestrialAnimalTypes, TerrestrialAnimalTypes1, AlienAnimalTypes;
-(TerrestrialAnimalTypes = TerrestrialAnimalTypes1 || (TerrestrialAnimalTypes1 = {
-})).CAT = "cat", TerrestrialAnimalTypes.DOG = "dog", (AlienAnimalTypes || (AlienAnimalTypes = {
-})).CAT = "cat", TerrestrialAnimalTypes1.CAT, AlienAnimalTypes.CAT;
+var TerrestrialAnimalTypes, AlienAnimalTypes, TerrestrialAnimalTypes, AlienAnimalTypes;
+(TerrestrialAnimalTypes = TerrestrialAnimalTypes || (TerrestrialAnimalTypes = {
+})).CAT = "cat", TerrestrialAnimalTypes.DOG = "dog", (AlienAnimalTypes = AlienAnimalTypes || (AlienAnimalTypes = {
+})).CAT = "cat", TerrestrialAnimalTypes.CAT, AlienAnimalTypes.CAT;
diff --git a/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es2015.1.normal/output.js
index 104e695d6e1..cba45d96fb0 100644
--- a/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es2015.1.normal/output.js
@@ -98,12 +98,12 @@ function foo14() {
 }
 var r14 = foo14();
 var e1;
-(function(e11) {
-    e11[e11["A"] = 0] = "A";
+(function(e1) {
+    e1[e1["A"] = 0] = "A";
 })(e1 || (e1 = {
 }));
-(function(e12) {
-    e12.y = 1;
+(function(e1) {
+    e1.y = 1;
 })(e1 || (e1 = {
 }));
 function foo15() {
diff --git a/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es2015.2.minified/output.js
index a700deed583..77359120743 100644
--- a/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var M, e1, M1, e11;
+var M, e1, M1, e1;
 function foo3() {
     return foo3();
 }
@@ -20,6 +20,6 @@ class c1 {
     }
 }
 (c1 || (c1 = {
-})).x = 1, (e11 = e1 || (e1 = {
-}))[e11.A = 0] = "A", (e1 || (e1 = {
+})).x = 1, (e1 = e1 || (e1 = {
+}))[e1.A = 0] = "A", (e1 || (e1 = {
 })).y = 1;
diff --git a/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es5.1.normal/output.js
index bf6860808f2..aa8faaacf60 100644
--- a/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es5.1.normal/output.js
@@ -110,12 +110,12 @@ function foo14() {
 }
 var r14 = foo14();
 var e1;
-(function(e11) {
-    e11[e11["A"] = 0] = "A";
+(function(e1) {
+    e1[e1["A"] = 0] = "A";
 })(e1 || (e1 = {
 }));
-(function(e12) {
-    e12.y = 1;
+(function(e1) {
+    e1.y = 1;
 })(e1 || (e1 = {
 }));
 function foo15() {
diff --git a/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es5.2.minified/output.js
index a34eba97821..1f000927327 100644
--- a/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/objectTypeLiteral/callSignatures/callSignatureWithoutReturnTypeAnnotationInference/input.ts/es5.2.minified/output.js
@@ -31,11 +31,11 @@ function m1() {
 }(M || (M = {
 })), (m1 || (m1 = {
 })).y = 2;
-var M, e11, c1 = function(x) {
+var M, e1, c1 = function(x) {
     "use strict";
     _classCallCheck(this, c1);
 };
 (c1 || (c1 = {
-})).x = 1, (e1 = e11 || (e11 = {
-}))[e1.A = 0] = "A", (e11 || (e11 = {
+})).x = 1, (e1 = e1 || (e1 = {
+}))[e1.A = 0] = "A", (e1 || (e1 = {
 })).y = 1;
diff --git a/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es2015.1.normal/output.js
index f3599ac7fa2..2563b259790 100644
--- a/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es2015.1.normal/output.js
@@ -4,8 +4,8 @@ var b = x;
 var c = x;
 var d = x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var e = x;
diff --git a/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es2015.2.minified/output.js
index 4faa0e0f6f4..73cfe1ba672 100644
--- a/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, E1, M;
-(E = E1 || (E1 = {
+var E, E, M;
+(E = E || (E = {
 }))[E.A = 0] = "A", (M || (M = {
 })).a = 1, M = !0;
diff --git a/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es5.1.normal/output.js
index 57f41131f29..e4e47470340 100644
--- a/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es5.1.normal/output.js
@@ -9,8 +9,8 @@ var b = x;
 var c = x;
 var d = x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var e = x;
diff --git a/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es5.2.minified/output.js
index ecb1f91769f..fc9319d34b3 100644
--- a/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/boolean/invalidBooleanAssignments/input.ts/es5.2.minified/output.js
@@ -1,5 +1,5 @@
-var E, E1, M;
-(E = E1 || (E1 = {
+var E, E, M;
+(E = E || (E = {
 }))[E.A = 0] = "A";
 var C = function() {
     "use strict";
diff --git a/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es2015.1.normal/output.js
index e641ad4fcca..308222f46a2 100644
--- a/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es2015.1.normal/output.js
@@ -1,13 +1,13 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
 })(E || (E = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["A"] = 0] = "A";
-    E21[E21["B"] = 1] = "B";
+(function(E2) {
+    E2[E2["A"] = 0] = "A";
+    E2[E2["B"] = 1] = "B";
 })(E2 || (E2 = {
 }));
 var e;
diff --git a/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es2015.2.minified/output.js
index 61b4d5a21fc..eb412bc21f5 100644
--- a/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, E2, E1, E21;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", (E21 = E2 || (E2 = {
-}))[E21.A = 0] = "A", E21[E21.B = 1] = "B", E2.A, E.A;
+var E, E2, E, E2;
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", (E2 = E2 || (E2 = {
+}))[E2.A = 0] = "A", E2[E2.B = 1] = "B", E2.A, E.A;
diff --git a/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es5.1.normal/output.js
index e641ad4fcca..308222f46a2 100644
--- a/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es5.1.normal/output.js
@@ -1,13 +1,13 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
 })(E || (E = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["A"] = 0] = "A";
-    E21[E21["B"] = 1] = "B";
+(function(E2) {
+    E2[E2["A"] = 0] = "A";
+    E2[E2["B"] = 1] = "B";
 })(E2 || (E2 = {
 }));
 var e;
diff --git a/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es5.2.minified/output.js
index 61b4d5a21fc..eb412bc21f5 100644
--- a/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/enum/invalidEnumAssignments/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, E2, E1, E21;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", (E21 = E2 || (E2 = {
-}))[E21.A = 0] = "A", E21[E21.B = 1] = "B", E2.A, E.A;
+var E, E2, E, E2;
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", (E2 = E2 || (E2 = {
+}))[E2.A = 0] = "A", E2[E2.B = 1] = "B", E2.A, E.A;
diff --git a/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es2015.1.normal/output.js
index c0a63543456..c7ab4d4a4de 100644
--- a/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
 })(E || (E = {
 }));
 var n;
diff --git a/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es2015.2.minified/output.js
index edf47d810b8..ea5a7566d62 100644
--- a/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, n, e, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", n = e, n = E.A, E.A, e = e, e = E.A, e = E.B, e = n, e = null, e = void 0, e = 1, e = 1, e = 1, e = -1;
+var E, n, e, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", n = e, n = E.A, E.A, e = e, e = E.A, e = E.B, e = n, e = null, e = void 0, e = 1, e = 1, e = 1, e = -1;
diff --git a/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es5.1.normal/output.js
index c0a63543456..c7ab4d4a4de 100644
--- a/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es5.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
-    E1[E1["B"] = 1] = "B";
+(function(E) {
+    E[E["A"] = 0] = "A";
+    E[E["B"] = 1] = "B";
 })(E || (E = {
 }));
 var n;
diff --git a/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es5.2.minified/output.js
index edf47d810b8..ea5a7566d62 100644
--- a/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/enum/validEnumAssignments/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, n, e, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E1[E1.B = 1] = "B", n = e, n = E.A, E.A, e = e, e = E.A, e = E.B, e = n, e = null, e = void 0, e = 1, e = 1, e = 1, e = -1;
+var E, n, e, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E[E.B = 1] = "B", n = e, n = E.A, E.A, e = e, e = E.A, e = E.B, e = n, e = null, e = void 0, e = 1, e = 1, e = 1, e = -1;
diff --git a/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es2015.1.normal/output.js
index 990c10f7a8c..78229d18dce 100644
--- a/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es2015.1.normal/output.js
@@ -5,8 +5,8 @@ var d = null;
 var e = null;
 e = null; // ok
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 E.A = null; // error
diff --git a/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es2015.2.minified/output.js
index e2b5195e1a3..d0bebcb257b 100644
--- a/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, M, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E.A = null, I = null, (M || (M = {
+var E, M, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E.A = null, I = null, (M || (M = {
 })).x = 1, M = null;
diff --git a/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es5.1.normal/output.js
index 1900735da45..ff50932910d 100644
--- a/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es5.1.normal/output.js
@@ -10,8 +10,8 @@ var d = null;
 var e = null;
 e = null; // ok
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 E.A = null; // error
diff --git a/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es5.2.minified/output.js
index d6618040a7a..0d8ed415cb5 100644
--- a/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/null/validNullAssignments/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-var E, M, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E.A = null;
+var E, M, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E.A = null;
 var C = function() {
     "use strict";
     !function(instance, Constructor) {
diff --git a/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es2015.1.normal/output.js
index 1a99c80e3be..1805071de84 100644
--- a/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es2015.1.normal/output.js
@@ -3,8 +3,8 @@ var a = x;
 var b = x;
 var c = x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var d = x;
diff --git a/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es2015.2.minified/output.js
index ff5094a3250..ed7528b1b1c 100644
--- a/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E.A;
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E.A;
diff --git a/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es5.1.normal/output.js
index 1a99c80e3be..1805071de84 100644
--- a/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es5.1.normal/output.js
@@ -3,8 +3,8 @@ var a = x;
 var b = x;
 var c = x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var d = x;
diff --git a/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es5.2.minified/output.js
index ff5094a3250..ed7528b1b1c 100644
--- a/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/number/validNumberAssignments/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E.A;
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E.A;
diff --git a/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es2015.1.normal/output.js
index 5752bdd5ceb..398b561ddbd 100644
--- a/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es2015.1.normal/output.js
@@ -20,8 +20,8 @@ function i(a1) {
 }
 i = x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var j = x;
diff --git a/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es2015.2.minified/output.js
index a747b8b5bb9..0fa0ea3bdd1 100644
--- a/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var M, E, E1;
+var M, E, E;
 (M || (M = {
-})).x = 1, M = "", (E1 = E || (E = {
-}))[E1.A = 0] = "A";
+})).x = 1, M = "", (E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es5.1.normal/output.js
index 43828db80cb..3325526c9b6 100644
--- a/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es5.1.normal/output.js
@@ -27,8 +27,8 @@ function i(a1) {
 }
 i = x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var j = x;
diff --git a/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es5.2.minified/output.js
index bb756125684..1e8655c1773 100644
--- a/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/string/invalidStringAssignments/input.ts/es5.2.minified/output.js
@@ -1,9 +1,9 @@
-var M, E, E1, C = function() {
+var M, E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
 (M || (M = {
-})).x = 1, M = "", (E1 = E || (E = {
-}))[E1.A = 0] = "A";
+})).x = 1, M = "", (E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es2015.1.normal/output.js
index 6385ac58958..c13d952d05b 100644
--- a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 E = x;
diff --git a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es2015.2.minified/output.js
index 8f2f3a08f11..444bd7b9d0a 100644
--- a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var x, E, M, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (E = x).A = x, I = x, (M || (M = {
+var x, E, M, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", (E = x).A = x, I = x, (M || (M = {
 })).x = 1, M = x;
diff --git a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es5.1.normal/output.js
index 6a968f8642f..c530f1a4764 100644
--- a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es5.1.normal/output.js
@@ -5,8 +5,8 @@ function _classCallCheck(instance, Constructor) {
 }
 var x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 E = x;
diff --git a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es5.2.minified/output.js
index b82b84064b1..52b76477c83 100644
--- a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedAssignments/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-(E = E1 || (E1 = {
-}))[E.A = 0] = "A", (E1 = x).A = x;
-var E, x, E1, M, C = function() {
+(E = E || (E = {
+}))[E.A = 0] = "A", (E = x).A = x;
+var E, x, E, M, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
diff --git a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es2015.1.normal/output.js
index 492098af4dd..290d65facad 100644
--- a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es2015.1.normal/output.js
@@ -27,8 +27,8 @@ function f(a1) {
 }
 x = f;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 x = E;
diff --git a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es2015.2.minified/output.js
index 0e9f1e50f92..0842fba191a 100644
--- a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var x, M, E, E1;
+var x, M, E, E;
 x = 1, x = "", x = !0, x = void 0, x = null, x = class {
 }, x = void 0, x = void 0, (M || (M = {
 })).x = 1, x = M, x = {
@@ -6,5 +6,5 @@ x = 1, x = "", x = !0, x = void 0, x = null, x = class {
     }
 }, x = function(a) {
     x = a;
-}, (E1 = E || (E = {
-}))[E1.A = 0] = "A", x = E, x = E.A;
+}, (E = E || (E = {
+}))[E.A = 0] = "A", x = E, x = E.A;
diff --git a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es5.1.normal/output.js
index fc8d93fd349..6fd719561ef 100644
--- a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es5.1.normal/output.js
@@ -34,8 +34,8 @@ function f(a1) {
 }
 x = f;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 x = E;
diff --git a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es5.2.minified/output.js
index 4f78716c3f7..a397219b546 100644
--- a/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/undefined/invalidUndefinedValues/input.ts/es5.2.minified/output.js
@@ -1,5 +1,5 @@
 x = 1, x = "", x = !0, x = a, x = null;
-var E, x, a, b, c, M, E1, C = function() {
+var E, x, a, b, c, M, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
@@ -11,5 +11,5 @@ x = C, x = b, x = c, (M || (M = {
     }
 }, x = function(a1) {
     x = a1;
-}, (E = E1 || (E1 = {
-}))[E.A = 0] = "A", x = E1, x = E1.A;
+}, (E = E || (E = {
+}))[E.A = 0] = "A", x = E, x = E.A;
diff --git a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es2015.1.normal/output.js
index 5041ae1c169..e8b614e816c 100644
--- a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es2015.1.normal/output.js
@@ -20,8 +20,8 @@ function i(a1) {
 }
 i = x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 x = E;
diff --git a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es2015.2.minified/output.js
index 6475eedff35..6f0b26d67f9 100644
--- a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es2015.2.minified/output.js
@@ -1,7 +1,7 @@
-var x, M, E, E1;
+var x, M, E, E;
 (M || (M = {
-})).x = 1, M = x, (E1 = E || (E = {
-}))[E1.A = 0] = "A", x = E, x = E.A, x = {
+})).x = 1, M = x, (E = E || (E = {
+}))[E.A = 0] = "A", x = E, x = E.A, x = {
     f () {
     }
 };
diff --git a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es5.1.normal/output.js
index ed1f9b87cfa..9f05fad0a7b 100644
--- a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es5.1.normal/output.js
@@ -27,8 +27,8 @@ function i(a1) {
 }
 i = x;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 x = E;
diff --git a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es5.2.minified/output.js
index 7a117331a7e..5b2fefda16e 100644
--- a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidAssignments/input.ts/es5.2.minified/output.js
@@ -1,12 +1,12 @@
-var x, M, E, E1, C = function() {
+var x, M, E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
 (M || (M = {
-})).x = 1, M = x, (E1 = E || (E = {
-}))[E1.A = 0] = "A", x = E, x = E.A, x = {
+})).x = 1, M = x, (E = E || (E = {
+}))[E.A = 0] = "A", x = E, x = E.A, x = {
     f: function() {
     }
 };
diff --git a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es2015.1.normal/output.js
index 110bb02de64..0f018ee3904 100644
--- a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es2015.1.normal/output.js
@@ -3,8 +3,8 @@ x = 1;
 x = '';
 x = true;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 x = E;
diff --git a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es2015.2.minified/output.js
index 959b7b79c10..15b18ccac99 100644
--- a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var x, E, a, b, M, E1;
-x = 1, x = "", x = !0, (E1 = E || (E = {
-}))[E1.A = 0] = "A", x = E, x = E.A, x = a, x = b, x = {
+var x, E, a, b, M, E;
+x = 1, x = "", x = !0, (E = E || (E = {
+}))[E.A = 0] = "A", x = E, x = E.A, x = a, x = b, x = {
     f () {
     }
 }, (M || (M = {
diff --git a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es5.1.normal/output.js
index 2f59496a1a2..8a5ffb2353e 100644
--- a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es5.1.normal/output.js
@@ -8,8 +8,8 @@ x = 1;
 x = '';
 x = true;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 x = E;
diff --git a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es5.2.minified/output.js
index b61087ad87e..32e300fdb9f 100644
--- a/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/primitives/void/invalidVoidValues/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-x = 1, x = "", x = !0, (E = E1 || (E1 = {
-}))[E.A = 0] = "A", x = E1, x = E1.A;
-var E, x, E1, a, b, M, C = function() {
+x = 1, x = "", x = !0, (E = E || (E = {
+}))[E.A = 0] = "A", x = E, x = E.A;
+var E, x, E, a, b, M, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
diff --git a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es2015.1.normal/output.js
index 3f506ca8e47..381c3a3d53c 100644
--- a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es2015.1.normal/output.js
@@ -28,8 +28,8 @@ export var r7;
 export var r8;
 export var r9;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 export var r10;
diff --git a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es2015.2.minified/output.js
index 33d816c2e25..a5dd9e97113 100644
--- a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es2015.2.minified/output.js
@@ -1,9 +1,9 @@
-var M, E, M1, E1, foo;
+var M, E, M1, E, foo;
 function foo1() {
 }
 (M1 = M || (M = {
 })).foo = "", M1.C = class {
-}, (E1 = E || (E = {
-}))[E1.A = 0] = "A", (foo = foo1 || (foo1 = {
+}, (E = E || (E = {
+}))[E.A = 0] = "A", (foo = foo1 || (foo1 = {
 })).y = 1, foo.C = class {
 };
diff --git a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es5.1.normal/output.js
index 9bad4f611af..0640c2d576d 100644
--- a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es5.1.normal/output.js
@@ -37,8 +37,8 @@ export var r7;
 export var r8;
 export var r9;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 export var r10;
diff --git a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es5.2.minified/output.js
index 050233d6c10..453180f7d1c 100644
--- a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofANonExportedType/input.ts/es5.2.minified/output.js
@@ -1,7 +1,7 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-var M, E, E1, C = function() {
+var M, E, E, C = function() {
     "use strict";
     _classCallCheck(this, C);
 };
@@ -15,8 +15,8 @@ function foo() {
     };
     M1.C = C1;
 }(M || (M = {
-})), (E1 = E || (E = {
-}))[E1.A = 0] = "A", (function(foo1) {
+})), (E = E || (E = {
+}))[E.A = 0] = "A", (function(foo1) {
     foo1.y = 1;
     var C2 = function() {
         "use strict";
diff --git a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es2015.1.normal/output.js
index cca9b33ed8f..d05704e221d 100644
--- a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es2015.1.normal/output.js
@@ -29,8 +29,8 @@ export var Z = M;
 export var r8;
 export var r9;
 export var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 export var r10;
diff --git a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es2015.2.minified/output.js
index a2d6249cefd..a62ea253a5d 100644
--- a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-var M, E, foo, r1, r2, c, c2, r3, r4, r4b, i, i2, r5, r5, M1, r6, r7, r8, r9, E1, r10, r11, r12, r13, x = 1;
-export { M1 as M, E1 as E };
+var M, E, foo, r1, r2, c, c2, r3, r4, r4b, i, i2, r5, r5, M1, r6, r7, r8, r9, E, r10, r11, r12, r13, x = 1;
+export { M1 as M };
 export var y = {
     foo: ""
 };
@@ -9,7 +9,7 @@ export class C {
 })).foo = "", M.C = class {
 };
 export var Z = M1;
-(E = E1 || (E1 = {
+(E = E || (E = {
 }))[E.A = 0] = "A";
 function foo1() {
 }
diff --git a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es5.1.normal/output.js
index 670aa987ff5..0b5c77df219 100644
--- a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es5.1.normal/output.js
@@ -38,8 +38,8 @@ export var Z = M;
 export var r8;
 export var r9;
 export var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 export var r10;
diff --git a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es5.2.minified/output.js
index feb1d6d65ce..e2e0048eb55 100644
--- a/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/specifyingTypes/typeQueries/typeofAnExportedType/input.ts/es5.2.minified/output.js
@@ -1,8 +1,7 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-var E, r1, r2, c, c2, r3, r4, r4b, i, i2, r5, r5, M, r6, r7, r8, r9, E1, r10, r11, r12, r13, x = 1;
-export { E1 as E };
+export var E, r1, r2, c, c2, r3, r4, r4b, i, i2, r5, r5, M, r6, r7, r8, r9, E, r10, r11, r12, r13, x = 1;
 export var y = {
     foo: ""
 };
@@ -20,7 +19,7 @@ export var C = function() {
 }(M || (M = {
 }));
 export var Z = M;
-(E = E1 || (E1 = {
+(E = E || (E = {
 }))[E.A = 0] = "A";
 export function foo() {
 }
diff --git a/crates/swc/tests/tsc-references/types/specifyingTypes/typeReferences/nonGenericTypeReferenceWithTypeArguments/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/specifyingTypes/typeReferences/nonGenericTypeReferenceWithTypeArguments/input.ts/es2015.1.normal/output.js
index 769e9e74e1e..43f1bc7add5 100644
--- a/crates/swc/tests/tsc-references/types/specifyingTypes/typeReferences/nonGenericTypeReferenceWithTypeArguments/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/specifyingTypes/typeReferences/nonGenericTypeReferenceWithTypeArguments/input.ts/es2015.1.normal/output.js
@@ -13,6 +13,7 @@ function f() {
     class C {
     }
     ;
+    let E;
     (function(E) {
     })(E || (E = {
     }));
diff --git a/crates/swc/tests/tsc-references/types/specifyingTypes/typeReferences/nonGenericTypeReferenceWithTypeArguments/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/specifyingTypes/typeReferences/nonGenericTypeReferenceWithTypeArguments/input.ts/es5.1.normal/output.js
index 6e6c08e2fbb..0d9380c80d8 100644
--- a/crates/swc/tests/tsc-references/types/specifyingTypes/typeReferences/nonGenericTypeReferenceWithTypeArguments/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/specifyingTypes/typeReferences/nonGenericTypeReferenceWithTypeArguments/input.ts/es5.1.normal/output.js
@@ -21,6 +21,7 @@ function f() {
         _classCallCheck(this, C);
     };
     ;
+    var E;
     (function(E) {
     })(E || (E = {
     }));
diff --git a/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es2015.1.normal/output.js
index 92254c2b043..24c1010e6e8 100644
--- a/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es2015.1.normal/output.js
@@ -12,13 +12,13 @@ class E extends A {
 class F extends A {
 }
 var E1;
-(function(E11) {
-    E11[E11["one"] = 0] = "one";
+(function(E1) {
+    E1[E1["one"] = 0] = "one";
 })(E1 || (E1 = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["one"] = 0] = "one";
+(function(E2) {
+    E2[E2["one"] = 0] = "one";
 })(E2 || (E2 = {
 }));
 // no error
diff --git a/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es2015.2.minified/output.js
index f712ffcb5d3..db6c02a71f6 100644
--- a/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es2015.2.minified/output.js
@@ -2,10 +2,10 @@ class C {
 }
 class D {
 }
-(E1 = E11 || (E11 = {
-}))[E1.one = 0] = "one", (E2 = E21 || (E21 = {
+(E1 = E1 || (E1 = {
+}))[E1.one = 0] = "one", (E2 = E2 || (E2 = {
 }))[E2.one = 0] = "one";
-var E1, E2, E11, E21, classCDATuple = [
+var E1, E2, E1, E2, classCDATuple = [
     new C(),
     new D()
 ];
diff --git a/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es5.1.normal/output.js
index e15f330c347..dcfc0273195 100644
--- a/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es5.1.normal/output.js
@@ -103,13 +103,13 @@ var F = /*#__PURE__*/ function(A) {
     return F;
 }(A);
 var E1;
-(function(E11) {
-    E11[E11["one"] = 0] = "one";
+(function(E1) {
+    E1[E1["one"] = 0] = "one";
 })(E1 || (E1 = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["one"] = 0] = "one";
+(function(E2) {
+    E2[E2["one"] = 0] = "one";
 })(E2 || (E2 = {
 }));
 // no error
diff --git a/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es5.2.minified/output.js
index 17cf7d711b8..c6a8d9d755e 100644
--- a/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/tuple/castingTuple/input.ts/es5.2.minified/output.js
@@ -45,7 +45,7 @@ function _createSuper(Derived) {
         })(self);
     };
 }
-var E1, E2, E11, A = function() {
+var E1, E2, E1, A = function() {
     "use strict";
     _classCallCheck(this, A), this.a = 10;
 }, C = function() {
@@ -71,10 +71,10 @@ var E1, E2, E11, A = function() {
     }
     return F;
 }(A);
-(E11 = E1 || (E1 = {
-}))[E11.one = 0] = "one", (E21 = E2 || (E2 = {
-}))[E21.one = 0] = "one";
-var E21, classCDATuple = [
+(E1 = E1 || (E1 = {
+}))[E1.one = 0] = "one", (E2 = E2 || (E2 = {
+}))[E2.one = 0] = "one";
+var E2, classCDATuple = [
     new C(),
     new D()
 ];
diff --git a/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es2015.1.normal/output.js
index 930000a0993..3149511eea5 100644
--- a/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es2015.1.normal/output.js
@@ -28,8 +28,8 @@ foo13(x13_1, x13_2);
 foo13(x13_2, x13_1);
 var x14;
 var E;
-(function(E1) {
-    E1[E1["x"] = 10] = "x";
+(function(E) {
+    E[E["x"] = 10] = "x";
 })(E || (E = {
 }));
 f15(E.x).toLowerCase();
diff --git a/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es2015.2.minified/output.js
index f094b340bab..ee93b3b0cde 100644
--- a/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, x13_1, x13_2, E1, x;
-foo13(x13_1, x13_2), foo13(x13_2, x13_1), (E = E1 || (E1 = {
-}))[E.x = 10] = "x", f15(E1.x).toLowerCase(), f16(x);
+var E, x13_1, x13_2, E, x;
+foo13(x13_1, x13_2), foo13(x13_2, x13_1), (E = E || (E = {
+}))[E.x = 10] = "x", f15(E.x).toLowerCase(), f16(x);
diff --git a/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es5.1.normal/output.js
index 8df4f256529..72fe155bda1 100644
--- a/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es5.1.normal/output.js
@@ -35,8 +35,8 @@ foo13(x13_1, x13_2);
 foo13(x13_2, x13_1);
 var x14;
 var E;
-(function(E1) {
-    E1[E1["x"] = 10] = "x";
+(function(E) {
+    E[E["x"] = 10] = "x";
 })(E || (E = {
 }));
 f15(E.x).toLowerCase();
diff --git a/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es5.2.minified/output.js
index 1b024c86d69..e7321d23295 100644
--- a/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeAliases/typeAliases/input.ts/es5.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, x13_1, x13_2, E1, x, C7 = function() {
+var E, x13_1, x13_2, E, x, C7 = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C7);
 };
-foo13(x13_1, x13_2), foo13(x13_2, x13_1), (E = E1 || (E1 = {
-}))[E.x = 10] = "x", f15(E1.x).toLowerCase(), f16(x);
+foo13(x13_1, x13_2), foo13(x13_2, x13_1), (E = E || (E = {
+}))[E.x = 10] = "x", f15(E.x).toLowerCase(), f16(x);
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es2015.1.normal/output.js
index d0bb4057a8b..a708abf037d 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es2015.1.normal/output.js
@@ -16,8 +16,8 @@ var r3 = foo3(a); // any
 var r3 = foo3(a); // any
 var r3 = foo3(a); // any
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var r3 = foo3(a); // any
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es2015.2.minified/output.js
index 46d480124d0..17ef92de451 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var a, E, E1;
+var a, E, E;
 function f() {
 }
-foo2(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), (E1 = E || (E = {
-}))[E1.A = 0] = "A", foo3(a), (f || (f = {
+foo2(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), foo3(a), (E = E || (E = {
+}))[E.A = 0] = "A", foo3(a), (f || (f = {
 })).bar = 1, foo3(a);
 class CC {
 }
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es5.1.normal/output.js
index b370447f7bd..789a6244252 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es5.1.normal/output.js
@@ -25,8 +25,8 @@ var r3 = foo3(a); // any
 var r3 = foo3(a); // any
 var r3 = foo3(a); // any
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var r3 = foo3(a); // any
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es5.2.minified/output.js
index 68e052442c5..48d0b1d2c42 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignabilityInInheritance/input.ts/es5.2.minified/output.js
@@ -13,10 +13,10 @@ var A2 = function() {
 };
 function f() {
 }
-foo3(a), foo3(a), foo3(a), (E1 = E || (E = {
-}))[E1.A = 0] = "A", foo3(a), (f || (f = {
+foo3(a), foo3(a), foo3(a), (E = E || (E = {
+}))[E.A = 0] = "A", foo3(a), (f || (f = {
 })).bar = 1, foo3(a);
-var a, E, E1, CC = function() {
+var a, E, E, CC = function() {
     "use strict";
     _classCallCheck(this, CC);
 };
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es2015.1.normal/output.js
index 5022bc1c15d..187b7466773 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es2015.1.normal/output.js
@@ -4,8 +4,8 @@ class C {
 var ac;
 var ai;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var ae;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es2015.2.minified/output.js
index 52b1e98a3af..4dac4549ce1 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es5.1.normal/output.js
index f9cb3a5de1c..37779b024d3 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es5.1.normal/output.js
@@ -11,8 +11,8 @@ var C = function C() {
 var ac;
 var ai;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var ae;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es5.2.minified/output.js
index 74f67cb635e..b3226de6741 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType/input.ts/es5.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1, C = function() {
+var E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
+(E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es2015.1.normal/output.js
index b3f62a9d8f8..b9dceab40b3 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es2015.1.normal/output.js
@@ -3,8 +3,8 @@ class A {
 class A2 {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es2015.2.minified/output.js
index df33eeb3a94..a2e87ad744c 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1;
+var E, E;
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (f || (f = {
 })).bar = 1;
 class c {
 }
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es5.1.normal/output.js
index ed1f4d75df5..7d7a80f1b39 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es5.1.normal/output.js
@@ -12,8 +12,8 @@ var A2 = function A2() {
     _classCallCheck(this, A2);
 };
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es5.2.minified/output.js
index e2381a729ad..6507a42018d 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/anyAssignableToEveryType2/input.ts/es5.2.minified/output.js
@@ -1,7 +1,7 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-var E, E1, A = function() {
+var E, E, A = function() {
     "use strict";
     _classCallCheck(this, A);
 }, A2 = function() {
@@ -10,8 +10,8 @@ var E, E1, A = function() {
 };
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (f || (f = {
 })).bar = 1;
 var c = function() {
     "use strict";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures4/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures4/input.ts/es2015.1.normal/output.js
index 3bbc8d35344..3a266be3fa3 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures4/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures4/input.ts/es2015.1.normal/output.js
@@ -9,7 +9,7 @@ var Errors;
     }
     class OtherDerived extends Base {
     }
-    var WithNonGenericSignaturesInBaseType;
+    let WithNonGenericSignaturesInBaseType;
     (function(WithNonGenericSignaturesInBaseType) {
         // target type with non-generic call signatures
         var a2;
@@ -54,7 +54,7 @@ var Errors;
         b17 = a17;
     })(WithNonGenericSignaturesInBaseType || (WithNonGenericSignaturesInBaseType = {
     }));
-    var WithGenericSignaturesInBaseType;
+    let WithGenericSignaturesInBaseType;
     (function(WithGenericSignaturesInBaseType) {
         // target type has generic call signature
         var a2;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures4/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures4/input.ts/es2015.2.minified/output.js
index b6ba3581c5c..bd7db5ed85f 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures4/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures4/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,11 @@
 var Errors;
 !function(Errors) {
-    var WithNonGenericSignaturesInBaseType, WithGenericSignaturesInBaseType, b2, b7, b8, b10, b11, b12, b15, b15a, b16, b17, b21, b3;
+    var b2, b7, b8, b10, b11, b12, b15, b15a, b16, b17, b21, b3;
+    let WithNonGenericSignaturesInBaseType;
     WithNonGenericSignaturesInBaseType || (WithNonGenericSignaturesInBaseType = {
-    }), b2 = b2, b7 = b7, b8 = b8, b10 = b10, b11 = b11, b12 = b12, b15 = b15, b15a = b15a, b16 = b16, b17 = b17, WithGenericSignaturesInBaseType || (WithGenericSignaturesInBaseType = {
+    }), b2 = b2, b7 = b7, b8 = b8, b10 = b10, b11 = b11, b12 = b12, b15 = b15, b15a = b15a, b16 = b16, b17 = b17;
+    let WithGenericSignaturesInBaseType;
+    WithGenericSignaturesInBaseType || (WithGenericSignaturesInBaseType = {
     }), b21 = b21, b3 = b3;
 }(Errors || (Errors = {
 }));
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithConstructSignatures4/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithConstructSignatures4/input.ts/es2015.1.normal/output.js
index 6c35b6f0f4f..4cd50f9ae00 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithConstructSignatures4/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithConstructSignatures4/input.ts/es2015.1.normal/output.js
@@ -9,7 +9,7 @@ var Errors;
     }
     class OtherDerived extends Base {
     }
-    var WithNonGenericSignaturesInBaseType;
+    let WithNonGenericSignaturesInBaseType;
     (function(WithNonGenericSignaturesInBaseType) {
         // target type with non-generic call signatures
         var a2;
@@ -54,7 +54,7 @@ var Errors;
         b17 = a17; // error
     })(WithNonGenericSignaturesInBaseType || (WithNonGenericSignaturesInBaseType = {
     }));
-    var WithGenericSignaturesInBaseType;
+    let WithGenericSignaturesInBaseType;
     (function(WithGenericSignaturesInBaseType) {
         // target type has generic call signature
         var a2;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithConstructSignatures4/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithConstructSignatures4/input.ts/es2015.2.minified/output.js
index b6ba3581c5c..bd7db5ed85f 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithConstructSignatures4/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/assignmentCompatWithConstructSignatures4/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,11 @@
 var Errors;
 !function(Errors) {
-    var WithNonGenericSignaturesInBaseType, WithGenericSignaturesInBaseType, b2, b7, b8, b10, b11, b12, b15, b15a, b16, b17, b21, b3;
+    var b2, b7, b8, b10, b11, b12, b15, b15a, b16, b17, b21, b3;
+    let WithNonGenericSignaturesInBaseType;
     WithNonGenericSignaturesInBaseType || (WithNonGenericSignaturesInBaseType = {
-    }), b2 = b2, b7 = b7, b8 = b8, b10 = b10, b11 = b11, b12 = b12, b15 = b15, b15a = b15a, b16 = b16, b17 = b17, WithGenericSignaturesInBaseType || (WithGenericSignaturesInBaseType = {
+    }), b2 = b2, b7 = b7, b8 = b8, b10 = b10, b11 = b11, b12 = b12, b15 = b15, b15a = b15a, b16 = b16, b17 = b17;
+    let WithGenericSignaturesInBaseType;
+    WithGenericSignaturesInBaseType || (WithGenericSignaturesInBaseType = {
     }), b21 = b21, b3 = b3;
 }(Errors || (Errors = {
 }));
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es2015.1.normal/output.js
index 3bc873253e6..3991f8d3a4a 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es2015.1.normal/output.js
@@ -1,12 +1,12 @@
 var // enums assignable to number, any, Object, errors unless otherwise noted
 E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var F;
-(function(F1) {
-    F1[F1["B"] = 0] = "B";
+(function(F) {
+    F[F["B"] = 0] = "B";
 })(F || (F = {
 }));
 var e = E.A;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es2015.2.minified/output.js
index 2010c58c52d..23983d411eb 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-(E = E1 || (E1 = {
-}))[E.A = 0] = "A", (F = F1 || (F1 = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (F = F || (F = {
 }))[F.B = 0] = "B";
-var E, F, E1, F1, e = E1.A, f = F1.B;
+var E, F, E, F, e = E.A, f = F.B;
 f = f, f = 1;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es5.1.normal/output.js
index a22e45ee84d..8dceaada618 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es5.1.normal/output.js
@@ -5,13 +5,13 @@ function _classCallCheck(instance, Constructor) {
 }
 var // enums assignable to number, any, Object, errors unless otherwise noted
 E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var F;
-(function(F1) {
-    F1[F1["B"] = 0] = "B";
+(function(F) {
+    F[F["B"] = 0] = "B";
 })(F || (F = {
 }));
 var e = E.A;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es5.2.minified/output.js
index 5ab7ccb29e4..0ef61e2efba 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignability/input.ts/es5.2.minified/output.js
@@ -1,7 +1,7 @@
-(E = E1 || (E1 = {
-}))[E.A = 0] = "A", (F = F1 || (F1 = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (F = F || (F = {
 }))[F.B = 0] = "B";
-var E, F, E1, F1, Others, e = E1.A, f = F1.B;
+var E, F, E, F, Others, e = E.A, f = F.B;
 f = f, f = 1, (function(Others) {
     var C = function() {
         "use strict";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es2015.1.normal/output.js
index f03a8c2a128..0c71d7cf873 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var // enum is only a subtype of number, no types are subtypes of enum, all of these except the first are errors
 E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var r = foo(E.A); // E
@@ -23,8 +23,8 @@ var r4 = foo10(E.A);
 var r4 = foo11(E.A);
 var r4 = foo12(E.A);
 var E2;
-(function(E21) {
-    E21[E21["A"] = 0] = "A";
+(function(E2) {
+    E2[E2["A"] = 0] = "A";
 })(E2 || (E2 = {
 }));
 var r4 = foo13(E.A);
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es2015.2.minified/output.js
index 7509ab23fcc..6ae6cfa5f65 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es2015.2.minified/output.js
@@ -1,11 +1,11 @@
-var E, E1, E2, E21;
+var E, E, E2, E2;
 function f() {
 }
-(E = E1 || (E1 = {
-}))[E.A = 0] = "A", foo(E1.A), foo(1), foo(null), foo2(E1.A), foo3(E1.A), foo4(E1.A), foo5(E1.A), foo6(E1.A), foo7(E1.A), foo8(E1.A), foo9(E1.A), foo10(E1.A), foo11(E1.A), foo12(E1.A), (E21 = E2 || (E2 = {
-}))[E21.A = 0] = "A", foo13(E1.A), (f || (f = {
-})).bar = 1, foo14(E1.A);
+(E = E || (E = {
+}))[E.A = 0] = "A", foo(E.A), foo(1), foo(null), foo2(E.A), foo3(E.A), foo4(E.A), foo5(E.A), foo6(E.A), foo7(E.A), foo8(E.A), foo9(E.A), foo10(E.A), foo11(E.A), foo12(E.A), (E2 = E2 || (E2 = {
+}))[E2.A = 0] = "A", foo13(E.A), (f || (f = {
+})).bar = 1, foo14(E.A);
 class CC {
 }
 (CC || (CC = {
-})).bar = 1, foo15(E1.A), foo16(E1.A), foo16(E1.A);
+})).bar = 1, foo15(E.A), foo16(E.A), foo16(E.A);
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es5.1.normal/output.js
index 2e4b5369212..71acee3973e 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es5.1.normal/output.js
@@ -5,8 +5,8 @@ function _classCallCheck(instance, Constructor) {
 }
 var // enum is only a subtype of number, no types are subtypes of enum, all of these except the first are errors
 E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var r = foo(E.A); // E
@@ -32,8 +32,8 @@ var r4 = foo10(E.A);
 var r4 = foo11(E.A);
 var r4 = foo12(E.A);
 var E2;
-(function(E21) {
-    E21[E21["A"] = 0] = "A";
+(function(E2) {
+    E2[E2["A"] = 0] = "A";
 })(E2 || (E2 = {
 }));
 var r4 = foo13(E.A);
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es5.2.minified/output.js
index 6bc3b5bf10d..9c8648f5797 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/enumAssignabilityInInheritance/input.ts/es5.2.minified/output.js
@@ -1,25 +1,25 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-(E = E1 || (E1 = {
-}))[E.A = 0] = "A", foo(E1.A), foo(1), foo(null), foo2(E1.A), foo3(E1.A), foo4(E1.A), foo5(E1.A), foo6(E1.A), foo7(E1.A), foo8(E1.A);
+(E = E || (E = {
+}))[E.A = 0] = "A", foo(E.A), foo(1), foo(null), foo2(E.A), foo3(E.A), foo4(E.A), foo5(E.A), foo6(E.A), foo7(E.A), foo8(E.A);
 var A = function() {
     "use strict";
     _classCallCheck(this, A);
 };
-foo9(E1.A);
+foo9(E.A);
 var A2 = function() {
     "use strict";
     _classCallCheck(this, A2);
 };
 function f() {
 }
-foo10(E1.A), foo11(E1.A), foo12(E1.A), (E21 = E2 || (E2 = {
-}))[E21.A = 0] = "A", foo13(E1.A), (f || (f = {
-})).bar = 1, foo14(E1.A);
-var E, E1, E2, E21, CC = function() {
+foo10(E.A), foo11(E.A), foo12(E.A), (E2 = E2 || (E2 = {
+}))[E2.A = 0] = "A", foo13(E.A), (f || (f = {
+})).bar = 1, foo14(E.A);
+var E, E, E2, E2, CC = function() {
     "use strict";
     _classCallCheck(this, CC);
 };
 (CC || (CC = {
-})).bar = 1, foo15(E1.A), foo16(E1.A), foo16(E1.A);
+})).bar = 1, foo15(E.A), foo16(E.A), foo16(E.A);
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es2015.1.normal/output.js
index a740bf9807f..e57401fa945 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es2015.1.normal/output.js
@@ -4,8 +4,8 @@ class C {
 var ac;
 var ai;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var ae;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es2015.2.minified/output.js
index 47941337af4..4dac4549ce1 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es5.1.normal/output.js
index b220c643469..19c1e167bf5 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es5.1.normal/output.js
@@ -11,8 +11,8 @@ var C = function C() {
 var ac;
 var ai;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var ae;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es5.2.minified/output.js
index 74f67cb635e..b3226de6741 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/everyTypeAssignableToAny/input.ts/es5.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1, C = function() {
+var E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
+(E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es2015.1.normal/output.js
index 7d6906739d3..cf34e4601c7 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es2015.1.normal/output.js
@@ -3,8 +3,8 @@ class C {
 var ac;
 var ai;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var ae;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es2015.2.minified/output.js
index 52b1e98a3af..4dac4549ce1 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es5.1.normal/output.js
index f5bbaa2c8c2..0ac07f2cda3 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es5.1.normal/output.js
@@ -10,8 +10,8 @@ var C = function C() {
 var ac;
 var ai;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var ae;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es5.2.minified/output.js
index 74f67cb635e..b3226de6741 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/nullAssignableToEveryType/input.ts/es5.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1, C = function() {
+var E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
+(E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es2015.1.normal/output.js
index c9c12990036..cefe0f1649e 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es2015.1.normal/output.js
@@ -1,6 +1,6 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var n;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es2015.2.minified/output.js
index 54aeb81c169..d582b5a4a25 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, n, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", n = n;
+var E, n, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", n = n;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es5.1.normal/output.js
index c9c12990036..cefe0f1649e 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es5.1.normal/output.js
@@ -1,6 +1,6 @@
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var n;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es5.2.minified/output.js
index 54aeb81c169..d582b5a4a25 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/numberAssignableToEnum/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, n, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", n = n;
+var E, n, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", n = n;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es2015.1.normal/output.js
index aa63803fc67..550ef7d2fe7 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es2015.1.normal/output.js
@@ -3,8 +3,8 @@ class C {
 var ac;
 var ai;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var ae;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es2015.2.minified/output.js
index 52b1e98a3af..4dac4549ce1 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
+var E, E;
+(E = E || (E = {
 }))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es5.1.normal/output.js
index e3585efb8be..04a965730b5 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es5.1.normal/output.js
@@ -10,8 +10,8 @@ var C = function C() {
 var ac;
 var ai;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var ae;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es5.2.minified/output.js
index 74f67cb635e..b3226de6741 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/assignmentCompatibility/undefinedAssignableToEveryType/input.ts/es5.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1, C = function() {
+var E, E, C = function() {
     "use strict";
     !function(instance, Constructor) {
         if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
     }(this, C);
 };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
+(E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es2015.1.normal/output.js
index 98d72073c14..a3bc98c01d2 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es2015.1.normal/output.js
@@ -8,13 +8,13 @@ function f3(x) {
     return true;
 }
 var E1;
-(function(E11) {
-    E11[E11["one"] = 0] = "one";
+(function(E1) {
+    E1[E1["one"] = 0] = "one";
 })(E1 || (E1 = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["two"] = 0] = "two";
+(function(E2) {
+    E2[E2["two"] = 0] = "two";
 })(E2 || (E2 = {
 }));
 var t1;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es2015.2.minified/output.js
index c9ae71c687c..5a0c2351171 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es2015.2.minified/output.js
@@ -1,6 +1,6 @@
-var E1, E2, E11, E21, t1, t2, t3, t4;
-(E1 = E11 || (E11 = {
-}))[E1.one = 0] = "one", (E2 = E21 || (E21 = {
+var E1, E2, E1, E2, t1, t2, t3, t4;
+(E1 = E1 || (E1 = {
+}))[E1.one = 0] = "one", (E2 = E2 || (E2 = {
 }))[E2.two = 0] = "two", t1 = [
     function(x) {
         return "foo";
@@ -9,13 +9,13 @@ var E1, E2, E11, E21, t1, t2, t3, t4;
         return 10;
     }
 ], t2 = [
-    E11.one,
-    E21.two
+    E1.one,
+    E2.two
 ], t3 = [
     5,
     void 0
 ], t4 = [
-    E11.one,
-    E21.two,
+    E1.one,
+    E2.two,
     20
 ], t1[2], t2[2], t3[2], t4[3];
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es5.1.normal/output.js
index 98d72073c14..a3bc98c01d2 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es5.1.normal/output.js
@@ -8,13 +8,13 @@ function f3(x) {
     return true;
 }
 var E1;
-(function(E11) {
-    E11[E11["one"] = 0] = "one";
+(function(E1) {
+    E1[E1["one"] = 0] = "one";
 })(E1 || (E1 = {
 }));
 var E2;
-(function(E21) {
-    E21[E21["two"] = 0] = "two";
+(function(E2) {
+    E2[E2["two"] = 0] = "two";
 })(E2 || (E2 = {
 }));
 var t1;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es5.2.minified/output.js
index c9ae71c687c..5a0c2351171 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple/input.ts/es5.2.minified/output.js
@@ -1,6 +1,6 @@
-var E1, E2, E11, E21, t1, t2, t3, t4;
-(E1 = E11 || (E11 = {
-}))[E1.one = 0] = "one", (E2 = E21 || (E21 = {
+var E1, E2, E1, E2, t1, t2, t3, t4;
+(E1 = E1 || (E1 = {
+}))[E1.one = 0] = "one", (E2 = E2 || (E2 = {
 }))[E2.two = 0] = "two", t1 = [
     function(x) {
         return "foo";
@@ -9,13 +9,13 @@ var E1, E2, E11, E21, t1, t2, t3, t4;
         return 10;
     }
 ], t2 = [
-    E11.one,
-    E21.two
+    E1.one,
+    E2.two
 ], t3 = [
     5,
     void 0
 ], t4 = [
-    E11.one,
-    E21.two,
+    E1.one,
+    E2.two,
     20
 ], t1[2], t2[2], t3[2], t4[3];
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es2015.1.normal/output.js
index 307cb730c6c..a5c74686679 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var // enums are only subtypes of number, any and no other types
 E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 class A {
@@ -9,8 +9,8 @@ class A {
 class A2 {
 }
 var E2;
-(function(E21) {
-    E21[E21["A"] = 0] = "A";
+(function(E2) {
+    E2[E2["A"] = 0] = "A";
 })(E2 || (E2 = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es2015.2.minified/output.js
index 76ccc74aec7..52b7e57538e 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es2015.2.minified/output.js
@@ -1,9 +1,9 @@
-var E, E2, E1, E21;
+var E, E2, E, E2;
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (E21 = E2 || (E2 = {
-}))[E21.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (E2 = E2 || (E2 = {
+}))[E2.A = 0] = "A", (f || (f = {
 })).bar = 1;
 class c {
 }
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es5.1.normal/output.js
index c4534175879..6c6e3522cc3 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es5.1.normal/output.js
@@ -5,8 +5,8 @@ function _classCallCheck(instance, Constructor) {
 }
 var // enums are only subtypes of number, any and no other types
 E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var A = function A() {
@@ -18,8 +18,8 @@ var A2 = function A2() {
     _classCallCheck(this, A2);
 };
 var E2;
-(function(E21) {
-    E21[E21["A"] = 0] = "A";
+(function(E2) {
+    E2[E2["A"] = 0] = "A";
 })(E2 || (E2 = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es5.2.minified/output.js
index 1e2be045421..b5c64ffecb3 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/enumIsNotASubtypeOfAnythingButNumber/input.ts/es5.2.minified/output.js
@@ -1,9 +1,9 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-(E = E1 || (E1 = {
+(E = E || (E = {
 }))[E.A = 0] = "A";
-var E, E1, E2, E21, A = function() {
+var E, E, E2, E2, A = function() {
     "use strict";
     _classCallCheck(this, A);
 }, A2 = function() {
@@ -12,8 +12,8 @@ var E, E1, E2, E21, A = function() {
 };
 function f() {
 }
-(E21 = E2 || (E2 = {
-}))[E21.A = 0] = "A", (f || (f = {
+(E2 = E2 || (E2 = {
+}))[E2.A = 0] = "A", (f || (f = {
 })).bar = 1;
 var c = function() {
     "use strict";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es2015.1.normal/output.js
index 6cb09258302..c55c20b43c8 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es2015.1.normal/output.js
@@ -44,8 +44,8 @@ var c2;
 var r12 = true ? c2 : null;
 var r12 = true ? null : c2;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var r13 = true ? E : null;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es2015.2.minified/output.js
index 04898585c2a..ef919fe3a0e 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1;
+var E, E;
 function f() {
 }
-new Date(), (E1 = E || (E = {
-}))[E1.A = 0] = "A", E.A, (f || (f = {
+new Date(), (E = E || (E = {
+}))[E.A = 0] = "A", E.A, (f || (f = {
 })).bar = 1;
 class c {
 }
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es5.1.normal/output.js
index 25f2ffa8e20..edc3520304c 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es5.1.normal/output.js
@@ -53,8 +53,8 @@ var c2;
 var r12 = true ? c2 : null;
 var r12 = true ? null : c2;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var r13 = true ? E : null;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es5.2.minified/output.js
index b6d57507ac8..a0b43bfe47e 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/nullIsSubtypeOfEverythingButUndefined/input.ts/es5.2.minified/output.js
@@ -11,10 +11,10 @@ var C1 = function() {
 };
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (f || (f = {
 })).bar = 1;
-var E, E1, c = function() {
+var E, E, c = function() {
     "use strict";
     _classCallCheck(this, c);
 };
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es2015.1.normal/output.js
index 9cd6b389d2a..6dfbf7cdcbc 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es2015.1.normal/output.js
@@ -87,8 +87,8 @@ function f12(x) {
 function f13(x) {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function f14(x) {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es2015.2.minified/output.js
index 47941337af4..4dac4549ce1 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es5.1.normal/output.js
index 33d15fb1689..d80862f5c27 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es5.1.normal/output.js
@@ -176,8 +176,8 @@ function f12(x) {
 function f13(x) {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function f14(x) {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es5.2.minified/output.js
index 4b1fc473255..102d28d3694 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/stringLiteralTypeIsSubtypeOfString/input.ts/es5.2.minified/output.js
@@ -4,7 +4,7 @@ function _defineProperties(target, props) {
         descriptor.enumerable = descriptor.enumerable || !1, descriptor.configurable = !0, "value" in descriptor && (descriptor.writable = !0), Object.defineProperty(target, descriptor.key, descriptor);
     }
 }
-var E, E1, C = function() {
+var E, E, C = function() {
     "use strict";
     var Constructor, protoProps, staticProps;
     function C() {
@@ -136,5 +136,5 @@ var E, E1, C = function() {
         }
     ], _defineProperties(Constructor.prototype, protoProps), staticProps && _defineProperties(Constructor, staticProps), C;
 }();
-(E = E1 || (E1 = {
+(E = E || (E = {
 }))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es2015.1.normal/output.js
index b3f62a9d8f8..b9dceab40b3 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es2015.1.normal/output.js
@@ -3,8 +3,8 @@ class A {
 class A2 {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es2015.2.minified/output.js
index df33eeb3a94..a2e87ad744c 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1;
+var E, E;
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (f || (f = {
 })).bar = 1;
 class c {
 }
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es5.1.normal/output.js
index ed1f4d75df5..7d7a80f1b39 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es5.1.normal/output.js
@@ -12,8 +12,8 @@ var A2 = function A2() {
     _classCallCheck(this, A2);
 };
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es5.2.minified/output.js
index e2381a729ad..6507a42018d 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfAny/input.ts/es5.2.minified/output.js
@@ -1,7 +1,7 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-var E, E1, A = function() {
+var E, E, A = function() {
     "use strict";
     _classCallCheck(this, A);
 }, A2 = function() {
@@ -10,8 +10,8 @@ var E, E1, A = function() {
 };
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (f || (f = {
 })).bar = 1;
 var c = function() {
     "use strict";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es2015.1.normal/output.js
index 82fd119d988..b550934df1e 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es2015.1.normal/output.js
@@ -12,8 +12,8 @@ class C1 {
 class C2 {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es2015.2.minified/output.js
index df33eeb3a94..a2e87ad744c 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1;
+var E, E;
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (f || (f = {
 })).bar = 1;
 class c {
 }
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es5.1.normal/output.js
index 12c3c049105..3b3e6feca84 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es5.1.normal/output.js
@@ -96,8 +96,8 @@ var C2 = function C2() {
     _classCallCheck(this, C2);
 };
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es5.2.minified/output.js
index 90731b223a1..68e946ed516 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameter/input.ts/es5.2.minified/output.js
@@ -11,7 +11,7 @@ function _setPrototypeOf(o, p) {
         return o.__proto__ = p, o;
     }, _setPrototypeOf(o, p);
 }
-var E, E1, _typeof = function(obj) {
+var E, E, _typeof = function(obj) {
     return obj && "undefined" != typeof Symbol && obj.constructor === Symbol ? "symbol" : typeof obj;
 }, C3 = function() {
     "use strict";
@@ -65,8 +65,8 @@ var E, E1, _typeof = function(obj) {
 };
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (f || (f = {
 })).bar = 1;
 var c = function() {
     "use strict";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es2015.1.normal/output.js
index 61ceef3a906..b644f0f365c 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es2015.1.normal/output.js
@@ -30,8 +30,8 @@ class C1 {
 class C2 {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es2015.2.minified/output.js
index df33eeb3a94..a2e87ad744c 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1;
+var E, E;
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (f || (f = {
 })).bar = 1;
 class c {
 }
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es5.1.normal/output.js
index 98647ab4c8d..a17521d950e 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es5.1.normal/output.js
@@ -39,8 +39,8 @@ var C2 = function C2() {
     _classCallCheck(this, C2);
 };
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es5.2.minified/output.js
index 48eaff5cea6..c7cb0708913 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfTypeParameterWithConstraints2/input.ts/es5.2.minified/output.js
@@ -1,7 +1,7 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-var E, E1, C1 = function() {
+var E, E, C1 = function() {
     "use strict";
     _classCallCheck(this, C1);
 }, C2 = function() {
@@ -10,8 +10,8 @@ var E, E1, C1 = function() {
 };
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (f || (f = {
 })).bar = 1;
 var c = function() {
     "use strict";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es2015.1.normal/output.js
index e33b3f621b5..1c6e8937aaa 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var E;
-(function(E1) {
-    E1[E1["e1"] = 0] = "e1";
-    E1[E1["e2"] = 1] = "e2";
+(function(E) {
+    E[E["e1"] = 0] = "e1";
+    E[E["e2"] = 1] = "e2";
 })(E || (E = {
 }));
 class A {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es2015.2.minified/output.js
index 9f5130d2b74..2eec6bd9537 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1;
+var E, E;
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.e1 = 0] = "e1", E1[E1.e2 = 1] = "e2", (f || (f = {
+(E = E || (E = {
+}))[E.e1 = 0] = "e1", E[E.e2 = 1] = "e2", (f || (f = {
 })).bar = 1;
 class c {
 }
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es5.1.normal/output.js
index a23d860a48d..cca4cf1c187 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es5.1.normal/output.js
@@ -4,9 +4,9 @@ function _classCallCheck(instance, Constructor) {
     }
 }
 var E;
-(function(E1) {
-    E1[E1["e1"] = 0] = "e1";
-    E1[E1["e2"] = 1] = "e2";
+(function(E) {
+    E[E["e1"] = 0] = "e1";
+    E[E["e2"] = 1] = "e2";
 })(E || (E = {
 }));
 var A = function A() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es5.2.minified/output.js
index ff45c4a6179..df032a577cd 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/subtypesOfUnion/input.ts/es5.2.minified/output.js
@@ -1,9 +1,9 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-(E = E1 || (E1 = {
+(E = E || (E = {
 }))[E.e1 = 0] = "e1", E[E.e2 = 1] = "e2";
-var E, E1, A = function() {
+var E, E, A = function() {
     "use strict";
     _classCallCheck(this, A);
 }, A2 = function() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es2015.1.normal/output.js
index fcbf717185b..569d98bb7c6 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es2015.1.normal/output.js
@@ -32,8 +32,8 @@ class D9 extends Base {
 class D10 extends Base {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 class D11 extends Base {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es2015.2.minified/output.js
index df33eeb3a94..a2e87ad744c 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es2015.2.minified/output.js
@@ -1,8 +1,8 @@
-var E, E1;
+var E, E;
 function f() {
 }
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", (f || (f = {
+(E = E || (E = {
+}))[E.A = 0] = "A", (f || (f = {
 })).bar = 1;
 class c {
 }
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es5.1.normal/output.js
index 28b8ea93d54..6ee4a810d26 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es5.1.normal/output.js
@@ -224,8 +224,8 @@ var D10 = /*#__PURE__*/ function(Base) {
     return D10;
 }(Base);
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var D11 = /*#__PURE__*/ function(Base) {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es5.2.minified/output.js
index 50c51106ee8..dd80336202b 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/undefinedIsSubtypeOfEverything/input.ts/es5.2.minified/output.js
@@ -45,7 +45,7 @@ function _createSuper(Derived) {
         })(self);
     };
 }
-var E, E1, Base = function() {
+var E, E, Base = function() {
     "use strict";
     _classCallCheck(this, Base);
 }, D0 = function(Base1) {
@@ -169,8 +169,8 @@ var E, E1, Base = function() {
     }
     return D10;
 }(Base);
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
+(E = E || (E = {
+}))[E.A = 0] = "A";
 var D11 = function(Base16) {
     "use strict";
     _inherits(D11, Base16);
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es2015.1.normal/output.js
index 7a374a26f5a..7df7acf387b 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es2015.1.normal/output.js
@@ -1,7 +1,7 @@
 var e;
-(function(e1) {
-    e1[e1["e1"] = 0] = "e1";
-    e1[e1["e2"] = 1] = "e2";
+(function(e) {
+    e[e["e1"] = 0] = "e1";
+    e[e["e2"] = 1] = "e2";
 })(e || (e = {
 }));
 class A {
@@ -9,8 +9,8 @@ class A {
 class A2 {
 }
 var E2;
-(function(E21) {
-    E21[E21["A"] = 0] = "A";
+(function(E2) {
+    E2[E2["A"] = 0] = "A";
 })(E2 || (E2 = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es2015.2.minified/output.js
index 8b1b508caaa..b3c301fab3b 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es2015.2.minified/output.js
@@ -1,9 +1,9 @@
-var e, E2, e1, E21;
+var e, E2, e, E2;
 function f() {
 }
-(e1 = e || (e = {
-}))[e1.e1 = 0] = "e1", e1[e1.e2 = 1] = "e2", (E21 = E2 || (E2 = {
-}))[E21.A = 0] = "A", (f || (f = {
+(e = e || (e = {
+}))[e.e1 = 0] = "e1", e[e.e2 = 1] = "e2", (E2 = E2 || (E2 = {
+}))[E2.A = 0] = "A", (f || (f = {
 })).bar = 1;
 class c {
 }
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es5.1.normal/output.js
index 1d2d190f0c9..bccc95a7fce 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es5.1.normal/output.js
@@ -4,9 +4,9 @@ function _classCallCheck(instance, Constructor) {
     }
 }
 var e;
-(function(e1) {
-    e1[e1["e1"] = 0] = "e1";
-    e1[e1["e2"] = 1] = "e2";
+(function(e) {
+    e[e["e1"] = 0] = "e1";
+    e[e["e2"] = 1] = "e2";
 })(e || (e = {
 }));
 var A = function A() {
@@ -18,8 +18,8 @@ var A2 = function A2() {
     _classCallCheck(this, A2);
 };
 var E2;
-(function(E21) {
-    E21[E21["A"] = 0] = "A";
+(function(E2) {
+    E2[E2["A"] = 0] = "A";
 })(E2 || (E2 = {
 }));
 function f() {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es5.2.minified/output.js
index 488ad443d28..28c6465b3cd 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/subtypesAndSuperTypes/unionSubtypeIfEveryConstituentTypeIsSubtype/input.ts/es5.2.minified/output.js
@@ -1,9 +1,9 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-(e = e1 || (e1 = {
+(e = e || (e = {
 }))[e.e1 = 0] = "e1", e[e.e2 = 1] = "e2";
-var e, e1, E2, E21, A = function() {
+var e, e, E2, E2, A = function() {
     "use strict";
     _classCallCheck(this, A);
 }, A2 = function() {
@@ -12,8 +12,8 @@ var e, e1, E2, E21, A = function() {
 };
 function f() {
 }
-(E21 = E2 || (E2 = {
-}))[E21.A = 0] = "A", (f || (f = {
+(E2 = E2 || (E2 = {
+}))[E2.A = 0] = "A", (f || (f = {
 })).bar = 1;
 var c = function() {
     "use strict";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es2015.1.normal/output.js
index 2e6446f3588..45d6f21011b 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es2015.1.normal/output.js
@@ -7,8 +7,8 @@ class C {
 }
 var a;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var b = {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es2015.2.minified/output.js
index c3e488e7257..ed7528b1b1c 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E = E1 || (E1 = {
-}))[E.A = 0] = "A", E1.A;
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A", E.A;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es5.1.normal/output.js
index 9407105ea54..189bea9353f 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es5.1.normal/output.js
@@ -17,8 +17,8 @@ var C = function C() {
 };
 var a;
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var b = {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es5.2.minified/output.js
index 8751a41830c..c62d467d01d 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentity2/input.ts/es5.2.minified/output.js
@@ -1,7 +1,7 @@
 function _classCallCheck(instance, Constructor) {
     if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
 }
-var E, E1, A = function() {
+var E, E, A = function() {
     "use strict";
     _classCallCheck(this, A);
 }, B = function() {
@@ -11,5 +11,5 @@ var E, E1, A = function() {
     "use strict";
     _classCallCheck(this, C);
 };
-(E1 = E || (E = {
-}))[E1.A = 0] = "A", E.A;
+(E = E || (E = {
+}))[E.A = 0] = "A", E.A;
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es2015.1.normal/output.js
index 7240d1a7a39..96458b6ab13 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es2015.1.normal/output.js
@@ -9,8 +9,8 @@ function foo4(x) {
 function foo5(x) {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function foo6(x) {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es2015.2.minified/output.js
index 47941337af4..4dac4549ce1 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es2015.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es5.1.normal/output.js
index 7240d1a7a39..96458b6ab13 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es5.1.normal/output.js
@@ -9,8 +9,8 @@ function foo4(x) {
 function foo5(x) {
 }
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 function foo6(x) {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es5.2.minified/output.js
index 47941337af4..4dac4549ce1 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeAndMemberIdentity/primtiveTypesAreIdentical/input.ts/es5.2.minified/output.js
@@ -1,3 +1,3 @@
-var E, E1;
-(E1 = E || (E = {
-}))[E1.A = 0] = "A";
+var E, E;
+(E = E || (E = {
+}))[E.A = 0] = "A";
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es2015.1.normal/output.js
index 5b4211cdf60..dc2ed0ce2db 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es2015.1.normal/output.js
@@ -29,22 +29,22 @@ var onlyT;
         , (b)=>b
         ); // valid, T is inferred to be Date
     }
-    var E1;
+    let E;
     (function(E) {
         E[E["A"] = 0] = "A";
-    })(E1 || (E1 = {
+    })(E || (E = {
     }));
-    var F1;
+    let F;
     (function(F) {
         F[F["A"] = 0] = "A";
-    })(F1 || (F1 = {
+    })(F || (F = {
     }));
     function foo3(x, a, b) {
         var r;
         return r;
     }
-    var r71 = foo3(E1.A, (x)=>E1.A
-    , (x)=>F1.A
+    var r71 = foo3(E.A, (x)=>E.A
+    , (x)=>F.A
     ); // error
 })(onlyT || (onlyT = {
 }));
@@ -76,10 +76,12 @@ var TU;
         , (b)=>b
         );
     }
+    let E;
     (function(E) {
         E[E["A"] = 0] = "A";
     })(E || (E = {
     }));
+    let F;
     (function(F) {
         F[F["A"] = 0] = "A";
     })(F || (F = {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es2015.2.minified/output.js
index edfdf0907e4..65ec8287cb1 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es2015.2.minified/output.js
@@ -1,24 +1,24 @@
 var onlyT, TU;
 !function(onlyT) {
-    var E, F, E1, F1;
-    (function(a, b) {
-    })((x)=>1
-    , (x)=>""
-    ), (E1 = E || (E = {
-    }))[E1.A = 0] = "A", (F1 = F || (F = {
-    }))[F1.A = 0] = "A", (function(x, a, b) {
+    var E, F;
+    let E;
+    (E = E || (E = {
+    }))[E.A = 0] = "A";
+    let F;
+    (F = F || (F = {
+    }))[F.A = 0] = "A", (function(x, a, b) {
     })(E.A, (x)=>E.A
     , (x)=>F.A
     );
 }(onlyT || (onlyT = {
 })), (function(TU) {
-    var E2, F2;
-    (function(a, b) {
-    })((x)=>1
-    , (x)=>""
-    ), (E2 = E || (E = {
-    }))[E2.A = 0] = "A", (F2 = F || (F = {
-    }))[F2.A = 0] = "A", (function(x, a, b) {
+    var E, F;
+    let E;
+    (E = E || (E = {
+    }))[E.A = 0] = "A";
+    let F;
+    (F = F || (F = {
+    }))[F.A = 0] = "A", (function(x, a, b) {
     })(E.A, (x)=>E.A
     , (x)=>F.A
     );
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es5.1.normal/output.js
index a9dca67d73b..67bc93f6370 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es5.1.normal/output.js
@@ -41,20 +41,20 @@ var onlyT;
     }, function(x) {
         return '';
     });
-    var E1;
+    var E;
     (function(E) {
         E[E["A"] = 0] = "A";
-    })(E1 || (E1 = {
+    })(E || (E = {
     }));
-    var F1;
+    var F;
     (function(F) {
         F[F["A"] = 0] = "A";
-    })(F1 || (F1 = {
+    })(F || (F = {
     }));
-    var r71 = foo3(E1.A, function(x) {
-        return E1.A;
+    var r71 = foo3(E.A, function(x) {
+        return E.A;
     }, function(x) {
-        return F1.A;
+        return F.A;
     }); // error
 })(onlyT || (onlyT = {
 }));
@@ -98,10 +98,12 @@ var TU;
     }, function(x) {
         return '';
     });
+    var E;
     (function(E) {
         E[E["A"] = 0] = "A";
     })(E || (E = {
     }));
+    var F;
     (function(F) {
         F[F["A"] = 0] = "A";
     })(F || (F = {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es5.2.minified/output.js
index 8e19855f942..05499f8cc93 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2/input.ts/es5.2.minified/output.js
@@ -1,14 +1,14 @@
 var onlyT, TU;
 !function(onlyT) {
-    var E, F, E1, F1;
+    var E, F, E, F;
     (function(a, b) {
     })(function(x) {
         return 1;
     }, function(x) {
         return "";
-    }), (E1 = E || (E = {
-    }))[E1.A = 0] = "A", (F1 = F || (F = {
-    }))[F1.A = 0] = "A", (function(x, a, b) {
+    }), (E = E || (E = {
+    }))[E.A = 0] = "A", (F = F || (F = {
+    }))[F.A = 0] = "A", (function(x, a, b) {
     })(E.A, function(x) {
         return E.A;
     }, function(x) {
@@ -16,15 +16,15 @@ var onlyT, TU;
     });
 }(onlyT || (onlyT = {
 })), (function(TU) {
-    var E2, F2;
+    var E, F, E, F;
     (function(a, b) {
     })(function(x) {
         return 1;
     }, function(x) {
         return "";
-    }), (E2 = E || (E = {
-    }))[E2.A = 0] = "A", (F2 = F || (F = {
-    }))[F2.A = 0] = "A", (function(x, a, b) {
+    }), (E = E || (E = {
+    }))[E.A = 0] = "A", (F = F || (F = {
+    }))[F.A = 0] = "A", (function(x, a, b) {
     })(E.A, function(x) {
         return E.A;
     }, function(x) {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es2015.1.normal/output.js
index be2027af844..26554856fdb 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es2015.1.normal/output.js
@@ -23,13 +23,13 @@ var r5 = foo(new Object(), (x)=>''
 , (x)=>''
 ); // Object => Object
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var F;
-(function(F1) {
-    F1[F1["A"] = 0] = "A";
+(function(F) {
+    F[F["A"] = 0] = "A";
 })(F || (F = {
 }));
 var r6 = foo(E.A, (x)=>E.A
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es2015.2.minified/output.js
index fb939d7d153..2abf6d899e1 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es2015.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, F, x, E1, F1;
+var E, F, x, E, F;
 function foo(x, a, b) {
 }
 function foo2(x, a, b) {
@@ -15,9 +15,9 @@ foo("", (x)=>""
 , (x)=>""
 ), foo(new Object(), (x)=>""
 , (x)=>""
-), (E1 = E || (E = {
-}))[E1.A = 0] = "A", (F1 = F || (F = {
-}))[F1.A = 0] = "A", foo(E.A, (x)=>E.A
+), (E = E || (E = {
+}))[E.A = 0] = "A", (F = F || (F = {
+}))[F.A = 0] = "A", foo(E.A, (x)=>E.A
 , (x)=>F.A
 ), foo2("", (x)=>""
 , (x)=>null
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es5.1.normal/output.js
index 28d13df1ff7..b6b00901ea6 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es5.1.normal/output.js
@@ -35,13 +35,13 @@ var r5 = foo(new Object(), function(x) {
     return '';
 }); // Object => Object
 var E;
-(function(E1) {
-    E1[E1["A"] = 0] = "A";
+(function(E) {
+    E[E["A"] = 0] = "A";
 })(E || (E = {
 }));
 var F;
-(function(F1) {
-    F1[F1["A"] = 0] = "A";
+(function(F) {
+    F[F["A"] = 0] = "A";
 })(F || (F = {
 }));
 var r6 = foo(E.A, function(x) {
diff --git a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es5.2.minified/output.js
index afa864ef2b6..ea9c97affcd 100644
--- a/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var E, F, x, E1, F1;
+var E, F, x, E, F;
 function foo(x, a, b) {
 }
 function foo2(x, a, b) {
@@ -27,9 +27,9 @@ foo("", function(x) {
     return "";
 }, function(x) {
     return "";
-}), (E1 = E || (E = {
-}))[E1.A = 0] = "A", (F1 = F || (F = {
-}))[F1.A = 0] = "A", foo(E.A, function(x) {
+}), (E = E || (E = {
+}))[E.A = 0] = "A", (F = F || (F = {
+}))[F.A = 0] = "A", foo(E.A, function(x) {
     return E.A;
 }, function(x) {
     return F.A;
diff --git a/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es2015.1.normal/output.js b/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es2015.1.normal/output.js
index 80d573d18ca..368008bf192 100644
--- a/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es2015.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es2015.1.normal/output.js
@@ -49,17 +49,17 @@ if (u === aFunction) {
     let uFunction = u;
 }
 var NumberEnum;
-(function(NumberEnum1) {
-    NumberEnum1[NumberEnum1["A"] = 0] = "A";
-    NumberEnum1[NumberEnum1["B"] = 1] = "B";
-    NumberEnum1[NumberEnum1["C"] = 2] = "C";
+(function(NumberEnum) {
+    NumberEnum[NumberEnum["A"] = 0] = "A";
+    NumberEnum[NumberEnum["B"] = 1] = "B";
+    NumberEnum[NumberEnum["C"] = 2] = "C";
 })(NumberEnum || (NumberEnum = {
 }));
 var StringEnum;
-(function(StringEnum1) {
-    StringEnum1["A"] = "A";
-    StringEnum1["B"] = "B";
-    StringEnum1["C"] = "C";
+(function(StringEnum) {
+    StringEnum["A"] = "A";
+    StringEnum["B"] = "B";
+    StringEnum["C"] = "C";
 })(StringEnum || (StringEnum = {
 }));
 if (u === NumberEnum || u === StringEnum) {
diff --git a/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es2015.2.minified/output.js b/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es2015.2.minified/output.js
index 4e9b394a4ce..dcd4c50af2f 100644
--- a/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es2015.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es2015.2.minified/output.js
@@ -1,5 +1,5 @@
-var NumberEnum, StringEnum, NumberEnum1, StringEnum1;
+var NumberEnum, StringEnum, NumberEnum, StringEnum;
 const u = void 0;
-5 === u && u.toString(10), !0 === u || !1 === u, void 0 === u, null === u, u === symb, 42 !== u, 42 !== u, 42 == u, !0 == u, u == Object, u === aString, u === aBoolean, u === aNumber, u === anObject, u === anObjectLiteral, u === aUnion, u === anIntersection, u === aFunction, (NumberEnum1 = NumberEnum || (NumberEnum = {
-}))[NumberEnum1.A = 0] = "A", NumberEnum1[NumberEnum1.B = 1] = "B", NumberEnum1[NumberEnum1.C = 2] = "C", (StringEnum1 = StringEnum || (StringEnum = {
-})).A = "A", StringEnum1.B = "B", StringEnum1.C = "C", u === NumberEnum || u === StringEnum, u === NumberEnum.A, u === StringEnum.B;
+5 === u && u.toString(10), !0 === u || !1 === u, void 0 === u, null === u, u === symb, 42 !== u, 42 !== u, 42 == u, !0 == u, u == Object, u === aString, u === aBoolean, u === aNumber, u === anObject, u === anObjectLiteral, u === aUnion, u === anIntersection, u === aFunction, (NumberEnum = NumberEnum || (NumberEnum = {
+}))[NumberEnum.A = 0] = "A", NumberEnum[NumberEnum.B = 1] = "B", NumberEnum[NumberEnum.C = 2] = "C", (StringEnum = StringEnum || (StringEnum = {
+})).A = "A", StringEnum.B = "B", StringEnum.C = "C", u === NumberEnum || u === StringEnum, u === NumberEnum.A, u === StringEnum.B;
diff --git a/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es5.1.normal/output.js b/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es5.1.normal/output.js
index 72de41130cf..3ba378a2ce7 100644
--- a/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es5.1.normal/output.js
+++ b/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es5.1.normal/output.js
@@ -50,17 +50,17 @@ if (u === aFunction) {
     var uFunction = u;
 }
 var NumberEnum;
-(function(NumberEnum1) {
-    NumberEnum1[NumberEnum1["A"] = 0] = "A";
-    NumberEnum1[NumberEnum1["B"] = 1] = "B";
-    NumberEnum1[NumberEnum1["C"] = 2] = "C";
+(function(NumberEnum) {
+    NumberEnum[NumberEnum["A"] = 0] = "A";
+    NumberEnum[NumberEnum["B"] = 1] = "B";
+    NumberEnum[NumberEnum["C"] = 2] = "C";
 })(NumberEnum || (NumberEnum = {
 }));
 var StringEnum;
-(function(StringEnum1) {
-    StringEnum1["A"] = "A";
-    StringEnum1["B"] = "B";
-    StringEnum1["C"] = "C";
+(function(StringEnum) {
+    StringEnum["A"] = "A";
+    StringEnum["B"] = "B";
+    StringEnum["C"] = "C";
 })(StringEnum || (StringEnum = {
 }));
 if (u === NumberEnum || u === StringEnum) {
diff --git a/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es5.2.minified/output.js b/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es5.2.minified/output.js
index 20fa34bbac2..4b9417427eb 100644
--- a/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es5.2.minified/output.js
+++ b/crates/swc/tests/tsc-references/types/unknown/unknownType2/input.ts/es5.2.minified/output.js
@@ -1,4 +1,4 @@
-var NumberEnum, StringEnum, NumberEnum1, StringEnum1, u = void 0;
-5 === u && u.toString(10), !0 === u || !1 === u, void 0 === u, null === u, u === symb, 42 !== u, 42 !== u, 42 == u, !0 == u, u == Object, u === aString, u === aBoolean, u === aNumber, u === anObject, u === anObjectLiteral, u === aUnion, u === anIntersection, u === aFunction, (NumberEnum = NumberEnum1 || (NumberEnum1 = {
-}))[NumberEnum.A = 0] = "A", NumberEnum[NumberEnum.B = 1] = "B", NumberEnum[NumberEnum.C = 2] = "C", (StringEnum = StringEnum1 || (StringEnum1 = {
-})).A = "A", StringEnum.B = "B", StringEnum.C = "C", u === NumberEnum1 || u === StringEnum1, u === NumberEnum1.A, u === StringEnum1.B;
+var NumberEnum, StringEnum, NumberEnum, StringEnum, u = void 0;
+5 === u && u.toString(10), !0 === u || !1 === u, void 0 === u, null === u, u === symb, 42 !== u, 42 !== u, 42 == u, !0 == u, u == Object, u === aString, u === aBoolean, u === aNumber, u === anObject, u === anObjectLiteral, u === aUnion, u === anIntersection, u === aFunction, (NumberEnum = NumberEnum || (NumberEnum = {
+}))[NumberEnum.A = 0] = "A", NumberEnum[NumberEnum.B = 1] = "B", NumberEnum[NumberEnum.C = 2] = "C", (StringEnum = StringEnum || (StringEnum = {
+})).A = "A", StringEnum.B = "B", StringEnum.C = "C", u === NumberEnum || u === StringEnum, u === NumberEnum.A, u === StringEnum.B;
diff --git a/crates/swc_bundler/tests/common/mod.rs b/crates/swc_bundler/tests/common/mod.rs
index 086776b8f6b..b715f10c8f6 100644
--- a/crates/swc_bundler/tests/common/mod.rs
+++ b/crates/swc_bundler/tests/common/mod.rs
@@ -17,6 +17,7 @@ use swc_common::{
 };
 use swc_ecma_ast::EsVersion;
 use swc_ecma_parser::{lexer::Lexer, Parser, StringInput, Syntax, TsConfig};
+use swc_ecma_transforms_base::resolver::resolver_with_mark;
 use swc_ecma_transforms_react::react;
 use swc_ecma_transforms_typescript::strip;
 use swc_ecma_visit::FoldWith;
@@ -129,15 +130,17 @@ impl Load for Loader {
             err.into_diagnostic(&handler).emit();
             panic!("failed to parse")
         });
-        let module =
-            module
-                .fold_with(&mut strip())
-                .fold_with(&mut react::<SingleThreadedComments>(
-                    self.cm.clone(),
-                    None,
-                    Default::default(),
-                    top_level_mark,
-                ));
+
+        let mark = Mark::fresh(Mark::root());
+        let module = module
+            .fold_with(&mut resolver_with_mark(mark))
+            .fold_with(&mut strip(mark))
+            .fold_with(&mut react::<SingleThreadedComments>(
+                self.cm.clone(),
+                None,
+                Default::default(),
+                top_level_mark,
+            ));
 
         Ok(ModuleData {
             fm,
diff --git a/crates/swc_ecma_minifier/src/compress/optimize/if_return.rs b/crates/swc_ecma_minifier/src/compress/optimize/if_return.rs
index bc7c437fa15..a0c2e10ec30 100644
--- a/crates/swc_ecma_minifier/src/compress/optimize/if_return.rs
+++ b/crates/swc_ecma_minifier/src/compress/optimize/if_return.rs
@@ -200,6 +200,9 @@ where
                 match s {
                     Stmt::Decl(Decl::Var(v)) => {
                         if v.decls.iter().all(|v| v.init.is_none()) {
+                            if last_idx == 0 {
+                                break;
+                            }
                             last_idx -= 1;
                             continue;
                         }
diff --git a/crates/swc_ecma_transforms/tests/decorators.rs b/crates/swc_ecma_transforms/tests/decorators.rs
index 3bd3c465509..212b7ec7b77 100644
--- a/crates/swc_ecma_transforms/tests/decorators.rs
+++ b/crates/swc_ecma_transforms/tests/decorators.rs
@@ -7,6 +7,7 @@
 
 use swc_common::{chain, Mark};
 use swc_ecma_parser::{EsConfig, Syntax, TsConfig};
+use swc_ecma_transforms::resolver_with_mark;
 use swc_ecma_transforms_base::resolver::resolver;
 use swc_ecma_transforms_compat::{
     es2015::{classes, function_name},
@@ -43,25 +44,30 @@ fn tr() -> impl Fold {
 }
 
 fn ts_transform() -> impl Fold {
-    chain!(
-        decorators(Config {
-            legacy: true,
-            ..Default::default()
-        }),
-        simple_strip(),
-    )
-}
-
-fn simple_strip() -> impl Fold {
-    strip::strip_with_config(strip::Config {
-        no_empty_export: true,
+    simple_strip(Config {
+        legacy: true,
         ..Default::default()
     })
 }
 
+fn simple_strip(config: Config) -> impl Fold {
+    let mark = Mark::fresh(Mark::root());
+    chain!(
+        decorators(config),
+        resolver_with_mark(mark),
+        strip::strip_with_config(
+            strip::Config {
+                no_empty_export: true,
+                ..Default::default()
+            },
+            mark
+        ),
+    )
+}
+
 /// Folder for `transformation_*` tests
 fn transformation() -> impl Fold {
-    chain!(decorators(Default::default()), simple_strip(),)
+    simple_strip(Default::default())
 }
 
 // transformation_declaration
@@ -77,7 +83,7 @@ class A {}
 let A = _decorate([dec()], function (_initialize) {
 
 
-  class A {
+  class A1 {
     constructor() {
       _initialize(this);
     }
@@ -85,7 +91,7 @@ let A = _decorate([dec()], function (_initialize) {
   }
 
   return {
-    F: A,
+    F: A1,
     d: []
   };
 });
@@ -118,7 +124,7 @@ class B extends A {
 let B = _decorate([dec], function (_initialize, _A) {
 
 
-  class B extends _A {
+  class B1 extends _A {
     constructor() {
       const foo = () => {
         super();
@@ -148,7 +154,7 @@ let B = _decorate([dec], function (_initialize, _A) {
   }
 
   return {
-    F: B,
+    F: B1,
     d: []
   };
 }, A);
@@ -199,7 +205,7 @@ class B extends A {
 let B = _decorate([dec], function (_initialize, _A) {
 
 
-  class B extends _A {
+  class B1 extends _A {
     constructor() {
       super();
 
@@ -209,7 +215,7 @@ let B = _decorate([dec], function (_initialize, _A) {
   }
 
   return {
-    F: B,
+    F: B1,
     d: []
   };
 }, A);
@@ -544,7 +550,7 @@ class Sub extends Super {
 let Sub = _decorate([decorator(parameter)], function (_initialize, _Super) {
 
 
-  class Sub extends _Super {
+  class Sub1 extends _Super {
     constructor() {
       var _temp;
 
@@ -554,7 +560,7 @@ let Sub = _decorate([decorator(parameter)], function (_initialize, _Super) {
   }
 
   return {
-    F: Sub,
+    F: Sub1,
     d: []
   };
 }, Super);
@@ -601,7 +607,7 @@ class A {
 let A = _decorate([dec(a, b, ...c)], function (_initialize) {
 
 
-  class A {
+  class A1 {
     constructor() {
       _initialize(this);
     }
@@ -609,7 +615,7 @@ let A = _decorate([dec(a, b, ...c)], function (_initialize) {
   }
 
   return {
-    F: A,
+    F: A1,
     d: [{
       kind: "method",
       decorators: [dec(a, b, ...c)],
@@ -725,7 +731,7 @@ class B extends A {
 let B = _decorate([dec], function (_initialize, _A) {
 
 
-  class B extends _A {
+  class B1 extends _A {
     constructor() {
       var _temp;
 
@@ -735,7 +741,7 @@ let B = _decorate([dec], function (_initialize, _A) {
   }
 
   return {
-    F: B,
+    F: B1,
     d: []
   };
 }, A);
@@ -775,7 +781,7 @@ export default @dec() class Foo {}
 "#,
     r#"
 let Foo = _decorate([dec()], function (_initialize) {
-  class Foo {
+  class Foo1 {
     constructor() {
       _initialize(this);
     }
@@ -783,7 +789,7 @@ let Foo = _decorate([dec()], function (_initialize) {
   }
 
   return {
-    F: Foo,
+    F: Foo1,
     d: []
   };
 });
@@ -1174,7 +1180,7 @@ test!(
 let A = _decorate([dec], function (_initialize, _B) {
 
 
-  class A extends _B {
+  class A1 extends _B {
     constructor(...args) {
       super(...args);
 
@@ -1184,7 +1190,7 @@ let A = _decorate([dec], function (_initialize, _B) {
   }
 
   return {
-    F: A,
+    F: A1,
     d: []
   };
 }, B);
@@ -1205,7 +1211,7 @@ async function g() {
 "#,
     r#"
 async function g() {
-  let A = _decorate([dec], function (_initialize, _super) {
+  let A1 = _decorate([dec], function (_initialize, _super) {
 
 
     class A extends _super {
@@ -1239,7 +1245,7 @@ function* g() {
 "#,
     r#"
 function* g() {
-  let A = _decorate([dec], function (_initialize, _super) {
+  let A1 = _decorate([dec], function (_initialize, _super) {
 
 
     class A extends _super {
@@ -1433,7 +1439,7 @@ class B extends A {
 let B = _decorate([dec], function (_initialize, _A) {
 
 
-  class B extends _A {
+  class B1 extends _A {
     constructor() {
       super();
 
@@ -1445,7 +1451,7 @@ let B = _decorate([dec], function (_initialize, _A) {
   }
 
   return {
-    F: B,
+    F: B1,
     d: []
   };
 }, A);
@@ -2040,13 +2046,10 @@ expect(typeof Parent.prototype.child).toBe("function");
 // legacy_regression_10264
 test!(
     syntax(true),
-    |_| chain!(
-        decorators(decorators::Config {
-            legacy: true,
-            ..Default::default()
-        }),
-        simple_strip()
-    ),
+    |_| simple_strip(decorators::Config {
+        legacy: true,
+        ..Default::default()
+    }),
     legacy_regression_10264,
     r#"
 function myDecorator(decoratee) {}
@@ -4288,13 +4291,10 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(
-        decorators(Config {
-            legacy: true,
-            ..Default::default()
-        }),
-        simple_strip()
-    ),
+    |_| simple_strip(Config {
+        legacy: true,
+        ..Default::default()
+    }),
     issue_823_1,
     "import {Debounce} from 'lodash-decorators';
 class Person {
@@ -4328,14 +4328,13 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(
-        decorators(Config {
+    |_| {
+        simple_strip(Config {
             legacy: true,
             ..Default::default()
-        }),
-        simple_strip(),
+        })
         // classes(Some(t.comments.clone())),
-    ),
+    },
     issue_823_2,
     "import {Debounce} from 'lodash-decorators';
 class Person {
@@ -4371,11 +4370,10 @@ test!(
         ..Default::default()
     }),
     |t| chain!(
-        decorators(Config {
+        simple_strip(Config {
             legacy: true,
             ..Default::default()
         }),
-        simple_strip(),
         classes(Some(t.comments.clone())),
     ),
     issue_823_3,
@@ -4396,10 +4394,10 @@ var _class1, _dec;
 import { Debounce } from 'lodash-decorators';
 let Person = ((_class1 = (_class = function() {
     'use strict';
-    function Person() {
-        _classCallCheck(this, Person);
+    function Person1() {
+        _classCallCheck(this, Person1);
     }
-    _createClass(Person, [
+    _createClass(Person1, [
         {
             key: 'save',
             value: function save() {
@@ -4407,7 +4405,7 @@ let Person = ((_class1 = (_class = function() {
             }
         }
     ]);
-    return Person;
+    return Person1;
 }(), _class.debounceTime = 500, _class)) || _class1, _dec = Debounce(_class1.debounceTime), \
      _applyDecoratedDescriptor(_class1.prototype, 'save', [
     _dec
@@ -4623,11 +4621,10 @@ test!(
     ts(),
     |_| chain!(
         inlining::inlining(inlining::Config {}),
-        decorators(Config {
+        simple_strip(Config {
             legacy: true,
             ..Default::default()
         }),
-        simple_strip(),
     ),
     issue_879_1,
     "export default class X {
@@ -5991,16 +5988,11 @@ test_exec!(
         decorators: true,
         ..Default::default()
     }),
-    |_| {
-        chain!(
-            decorators(Config {
-                legacy: true,
-                emit_metadata: true,
-                ..Default::default()
-            }),
-            strip()
-        )
-    },
+    |_| simple_strip(Config {
+        legacy: true,
+        emit_metadata: true,
+        ..Default::default()
+    }),
     issue_1362_1,
     "
     const { IsString } = require('class-validator');
diff --git a/crates/swc_ecma_transforms_base/src/resolver/mod.rs b/crates/swc_ecma_transforms_base/src/resolver/mod.rs
index d6367f7d013..743c4f79c6a 100644
--- a/crates/swc_ecma_transforms_base/src/resolver/mod.rs
+++ b/crates/swc_ecma_transforms_base/src/resolver/mod.rs
@@ -377,7 +377,6 @@ impl<'a> VisitMut for Resolver<'a> {
 
     typed_ref!(visit_mut_ts_array_type, TsArrayType);
     typed_ref!(visit_mut_ts_conditional_type, TsConditionalType);
-    typed_ref!(visit_mut_ts_entity_name, TsEntityName);
     typed_ref!(
         visit_mut_ts_type_param_instantiation,
         TsTypeParamInstantiation
@@ -387,7 +386,6 @@ impl<'a> VisitMut for Resolver<'a> {
     typed_ref!(visit_mut_ts_type_operator, TsTypeOperator);
     typed_ref!(visit_mut_ts_type, TsType);
     typed_ref!(visit_mut_ts_type_ann, TsTypeAnn);
-    typed_ref!(visit_mut_ts_type_assertion, TsTypeAssertion);
     typed!(
         visit_mut_ts_union_or_intersection_type,
         TsUnionOrIntersectionType
@@ -400,31 +398,22 @@ impl<'a> VisitMut for Resolver<'a> {
     typed_ref!(visit_mut_ts_intersection_type, TsIntersectionType);
     typed_ref!(visit_mut_ts_type_ref, TsTypeRef);
     typed_decl!(visit_mut_ts_type_param_decl, TsTypeParamDecl);
-    typed!(visit_mut_ts_enum_member, TsEnumMember);
     typed!(visit_mut_ts_fn_param, TsFnParam);
     typed!(visit_mut_ts_indexed_access_type, TsIndexedAccessType);
     typed!(visit_mut_ts_index_signature, TsIndexSignature);
     typed!(visit_mut_ts_interface_body, TsInterfaceBody);
-    typed!(visit_mut_ts_module_ref, TsModuleRef);
     typed!(visit_mut_ts_parenthesized_type, TsParenthesizedType);
     typed!(visit_mut_ts_type_lit, TsTypeLit);
     typed!(visit_mut_ts_type_element, TsTypeElement);
-    typed!(visit_mut_ts_module_block, TsModuleBlock);
-    typed!(visit_mut_ts_namespace_body, TsNamespaceBody);
     typed!(visit_mut_ts_optional_type, TsOptionalType);
-    typed!(visit_mut_ts_param_prop, TsParamProp);
     typed!(visit_mut_ts_rest_type, TsRestType);
     typed!(visit_mut_ts_type_predicate, TsTypePredicate);
     typed_ref!(visit_mut_ts_this_type_or_ident, TsThisTypeOrIdent);
     typed_ref!(visit_mut_ts_expr_with_type_args, TsExprWithTypeArgs);
 
     fn visit_mut_import_decl(&mut self, n: &mut ImportDecl) {
-        if n.type_only {
-            if !self.handle_types {
-                return;
-            }
-        }
-
+        // Always resolve the import declaration identifiers even if it's type only.
+        // We need to analyze these identifiers for type stripping purposes.
         self.ident_type = IdentType::Binding;
         self.in_type = n.type_only;
         n.visit_mut_children_with(self);
@@ -933,6 +922,22 @@ impl<'a> VisitMut for Resolver<'a> {
         stmts.visit_mut_children_with(self)
     }
 
+    fn visit_mut_ts_as_expr(&mut self, n: &mut TsAsExpr) {
+        if self.handle_types {
+            n.type_ann.visit_mut_with(self);
+        }
+
+        n.expr.visit_mut_with(self);
+    }
+
+    fn visit_mut_ts_type_assertion(&mut self, n: &mut TsTypeAssertion) {
+        if self.handle_types {
+            n.type_ann.visit_mut_with(self);
+        }
+
+        n.expr.visit_mut_with(self);
+    }
+
     fn visit_mut_ts_call_signature_decl(&mut self, n: &mut TsCallSignatureDecl) {
         if !self.handle_types {
             return;
@@ -994,12 +999,7 @@ impl<'a> VisitMut for Resolver<'a> {
     }
 
     fn visit_mut_ts_enum_decl(&mut self, decl: &mut TsEnumDecl) {
-        if !self.handle_types {
-            return;
-        }
-
-        self.in_type = false;
-        self.modify(&mut decl.id, None);
+        self.modify(&mut decl.id, Some(VarDeclKind::Let));
         decl.members.visit_mut_with(self);
     }
 
@@ -1039,12 +1039,16 @@ impl<'a> VisitMut for Resolver<'a> {
     }
 
     fn visit_mut_ts_interface_decl(&mut self, n: &mut TsInterfaceDecl) {
+        // always resolve the identifier for type stripping purposes
+        let old_in_type = self.in_type;
+        self.in_type = true;
+        self.modify(&mut n.id, None);
+
         if !self.handle_types {
+            self.in_type = old_in_type;
             return;
         }
 
-        self.in_type = true;
-        self.modify(&mut n.id, None);
         let child_mark = Mark::fresh(Mark::root());
         // Child folder
         let mut child = Resolver::new(
@@ -1056,6 +1060,7 @@ impl<'a> VisitMut for Resolver<'a> {
         n.type_params.visit_mut_with(&mut child);
         n.extends.visit_mut_with(&mut child);
         n.body.visit_mut_with(&mut child);
+        self.in_type = old_in_type;
     }
 
     fn visit_mut_ts_mapped_type(&mut self, n: &mut TsMappedType) {
@@ -1102,7 +1107,7 @@ impl<'a> VisitMut for Resolver<'a> {
     fn visit_mut_ts_module_decl(&mut self, decl: &mut TsModuleDecl) {
         match &mut decl.id {
             TsModuleName::Ident(i) => {
-                self.modify(i, None);
+                self.modify(i, Some(VarDeclKind::Let));
             }
             TsModuleName::Str(_) => {}
         }
@@ -1119,21 +1124,12 @@ impl<'a> VisitMut for Resolver<'a> {
     }
 
     fn visit_mut_ts_namespace_decl(&mut self, n: &mut TsNamespaceDecl) {
-        if !self.handle_types {
-            return;
-        }
-
-        self.in_type = true;
-        self.modify(&mut n.id, None);
+        self.modify(&mut n.id, Some(VarDeclKind::Let));
 
         n.body.visit_mut_with(self);
     }
 
     fn visit_mut_ts_param_prop_param(&mut self, n: &mut TsParamPropParam) {
-        if !self.handle_types {
-            return;
-        }
-
         self.in_type = false;
         self.ident_type = IdentType::Binding;
         n.visit_mut_children_with(self)
@@ -1163,11 +1159,6 @@ impl<'a> VisitMut for Resolver<'a> {
     }
 
     fn visit_mut_ts_qualified_name(&mut self, n: &mut TsQualifiedName) {
-        if !self.handle_types {
-            return;
-        }
-
-        self.in_type = true;
         self.ident_type = IdentType::Ref;
 
         n.left.visit_mut_with(self)
@@ -1190,12 +1181,16 @@ impl<'a> VisitMut for Resolver<'a> {
     }
 
     fn visit_mut_ts_type_alias_decl(&mut self, n: &mut TsTypeAliasDecl) {
+        // always resolve the identifier for type stripping purposes
+        let old_in_type = self.in_type;
+        self.in_type = true;
+        self.modify(&mut n.id, None);
+
         if !self.handle_types {
+            self.in_type = old_in_type;
             return;
         }
 
-        self.in_type = true;
-        self.modify(&mut n.id, None);
         let child_mark = Mark::fresh(Mark::root());
         // Child folder
         let mut child = Resolver::new(
@@ -1206,6 +1201,7 @@ impl<'a> VisitMut for Resolver<'a> {
 
         n.type_params.visit_mut_with(&mut child);
         n.type_ann.visit_mut_with(&mut child);
+        self.in_type = old_in_type;
     }
 
     fn visit_mut_ts_type_param(&mut self, param: &mut TsTypeParam) {
@@ -1318,11 +1314,6 @@ impl VisitMut for Hoister<'_, '_> {
 
         if self.resolver.handle_types {
             match decl {
-                Decl::TsEnum(e) => {
-                    self.resolver.in_type = true;
-                    self.resolver.modify(&mut e.id, None);
-                }
-
                 Decl::TsInterface(i) => {
                     self.resolver.in_type = true;
                     self.resolver.modify(&mut i.id, None);
diff --git a/crates/swc_ecma_transforms_module/tests/common_js.rs b/crates/swc_ecma_transforms_module/tests/common_js.rs
index b2ac8812ed1..d8e1f0a0eb3 100644
--- a/crates/swc_ecma_transforms_module/tests/common_js.rs
+++ b/crates/swc_ecma_transforms_module/tests/common_js.rs
@@ -99,7 +99,7 @@ test!(
         let scope = Rc::new(RefCell::new(Scope::default()));
         chain!(
             resolver_with_mark(mark),
-            // Optional::new(typescript::strip(), syntax.typescript()),
+            // Optional::new(typescript::strip(mark), syntax.typescript()),
             import_analyzer(Rc::clone(&scope)),
             inject_helpers(),
             common_js(mark, Default::default(), Some(scope)),
diff --git a/crates/swc_ecma_transforms_optimization/tests/simplify.rs b/crates/swc_ecma_transforms_optimization/tests/simplify.rs
index 3763e50f2ab..40aa06b8dfb 100644
--- a/crates/swc_ecma_transforms_optimization/tests/simplify.rs
+++ b/crates/swc_ecma_transforms_optimization/tests/simplify.rs
@@ -3,7 +3,10 @@
 use std::{cell::RefCell, rc::Rc};
 use swc_common::{chain, Mark};
 use swc_ecma_parser::{EsConfig, Syntax, TsConfig};
-use swc_ecma_transforms_base::{helpers::inject_helpers, resolver::resolver};
+use swc_ecma_transforms_base::{
+    helpers::inject_helpers,
+    resolver::{resolver, resolver_with_mark},
+};
 use swc_ecma_transforms_compat::{es2015, es2016, es2017, es2018, es2022::class_properties, es3};
 use swc_ecma_transforms_module::{
     common_js::common_js, import_analysis::import_analyzer, util::Scope,
@@ -469,12 +472,15 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(
-        strip(),
-        resolver(),
-        dce(Default::default()),
-        inlining(Default::default())
-    ),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(
+            resolver_with_mark(mark),
+            strip(mark),
+            dce(Default::default()),
+            inlining(Default::default())
+        )
+    },
     issue_1156_1,
     "
     interface D {
@@ -536,10 +542,12 @@ test!(
         ..Default::default()
     }),
     |t| {
+        let mark = Mark::fresh(Mark::root());
         let scope = Rc::new(RefCell::new(Scope::default()));
         chain!(
-            strip(),
             decorators(Default::default()),
+            resolver_with_mark(mark),
+            strip(mark),
             class_properties(class_properties::Config { loose: false }),
             simplifier(Default::default()),
             es2018(Default::default()),
diff --git a/crates/swc_ecma_transforms_optimization/tests/simplify_dce.rs b/crates/swc_ecma_transforms_optimization/tests/simplify_dce.rs
index ad59b3687ea..5cf6928c13d 100644
--- a/crates/swc_ecma_transforms_optimization/tests/simplify_dce.rs
+++ b/crates/swc_ecma_transforms_optimization/tests/simplify_dce.rs
@@ -1,6 +1,6 @@
-use swc_common::{chain, pass::Repeat};
+use swc_common::{chain, pass::Repeat, Mark};
 use swc_ecma_parser::{EsConfig, Syntax, TsConfig};
-use swc_ecma_transforms_base::resolver::resolver;
+use swc_ecma_transforms_base::resolver::{resolver, resolver_with_mark};
 use swc_ecma_transforms_optimization::simplify::dce::dce;
 use swc_ecma_transforms_proposal::decorators;
 use swc_ecma_transforms_testing::test;
@@ -413,15 +413,18 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(
-        resolver(),
-        strip(),
-        decorators(decorators::Config {
-            legacy: true,
-            emit_metadata: false
-        }),
-        tr()
-    ),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(
+            decorators(decorators::Config {
+                legacy: true,
+                emit_metadata: false
+            }),
+            resolver_with_mark(mark),
+            strip(mark),
+            tr()
+        )
+    },
     issue_898_2,
     "export default class X {
     @whatever
@@ -460,15 +463,18 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(
-        resolver(),
-        strip(),
-        decorators(decorators::Config {
-            legacy: true,
-            emit_metadata: false
-        }),
-        tr()
-    ),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(
+            decorators(decorators::Config {
+                legacy: true,
+                emit_metadata: false
+            }),
+            resolver_with_mark(mark),
+            strip(mark),
+            tr()
+        )
+    },
     issue_1111,
     "
     const a = 1;
@@ -534,7 +540,10 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(strip(), resolver(), tr()),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(resolver_with_mark(mark), strip(mark), tr())
+    },
     issue_1156_1,
     "
     export interface D {
@@ -569,7 +578,10 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(strip(), resolver(), tr(),),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(resolver_with_mark(mark), strip(mark), tr(),)
+    },
     issue_1156_2,
     "
     interface D {
@@ -630,7 +642,10 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(strip(), resolver(), tr(),),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(resolver_with_mark(mark), strip(mark), tr(),)
+    },
     issue_1156_3,
     "
     function d() {
@@ -663,7 +678,10 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(strip(), resolver(), tr(),),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(resolver_with_mark(mark), strip(mark), tr(),)
+    },
     issue_1156_4,
     "
     interface D {
diff --git a/crates/swc_ecma_transforms_optimization/tests/simplify_inlining.rs b/crates/swc_ecma_transforms_optimization/tests/simplify_inlining.rs
index 62f7d40f26a..0884b24c575 100644
--- a/crates/swc_ecma_transforms_optimization/tests/simplify_inlining.rs
+++ b/crates/swc_ecma_transforms_optimization/tests/simplify_inlining.rs
@@ -1,18 +1,21 @@
 //! Copied from https://github.com/google/closure-compiler/blob/6ca3b62990064488074a1a8931b9e8dc39b148b3/test/com/google/javascript/jscomp/InlineVariablesTest.java
 
-use swc_common::chain;
+use swc_common::{chain, Mark};
 use swc_ecma_parser::{Syntax, TsConfig};
-use swc_ecma_transforms_base::resolver::resolver;
+use swc_ecma_transforms_base::resolver::{resolver, resolver_with_mark};
 use swc_ecma_transforms_optimization::simplify::inlining::inlining;
 use swc_ecma_transforms_testing::test;
 use swc_ecma_transforms_typescript::strip;
 use swc_ecma_visit::Fold;
 
-fn simple_strip() -> impl Fold {
-    strip::strip_with_config(strip::Config {
-        no_empty_export: true,
-        ..Default::default()
-    })
+fn simple_strip(mark: Mark) -> impl Fold {
+    strip::strip_with_config(
+        strip::Config {
+            no_empty_export: true,
+            ..Default::default()
+        },
+        mark,
+    )
 }
 
 macro_rules! to {
@@ -2150,7 +2153,14 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(simple_strip(), resolver(), inlining(Default::default())),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(
+            resolver_with_mark(mark),
+            simple_strip(mark),
+            inlining(Default::default())
+        )
+    },
     issue_1156_1,
     "
     export interface D {
@@ -2185,7 +2195,14 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(simple_strip(), resolver(), inlining(Default::default())),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(
+            resolver_with_mark(mark),
+            simple_strip(mark),
+            inlining(Default::default())
+        )
+    },
     issue_1156_2,
     "
     interface D {
@@ -2246,7 +2263,14 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(simple_strip(), resolver(), inlining(Default::default())),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(
+            resolver_with_mark(mark),
+            simple_strip(mark),
+            inlining(Default::default())
+        )
+    },
     deno_8180_1,
     r#"
     var Status;
@@ -2290,7 +2314,14 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(simple_strip(), resolver(), inlining(Default::default())),
+    |_| {
+        let mark = Mark::fresh(Mark::root());
+        chain!(
+            resolver_with_mark(mark),
+            simple_strip(mark),
+            inlining(Default::default())
+        )
+    },
     deno_8189_1,
     "
     let A, I = null;
diff --git a/crates/swc_ecma_transforms_typescript/benches/compat.rs b/crates/swc_ecma_transforms_typescript/benches/compat.rs
index 0babf2c3c08..521146f4a16 100644
--- a/crates/swc_ecma_transforms_typescript/benches/compat.rs
+++ b/crates/swc_ecma_transforms_typescript/benches/compat.rs
@@ -5,7 +5,7 @@ extern crate test;
 use swc_common::{chain, comments::SingleThreadedComments, sync::Lrc, FileName, Mark, SourceMap};
 use swc_ecma_ast::Module;
 use swc_ecma_parser::{lexer::Lexer, Parser, StringInput, Syntax};
-use swc_ecma_transforms_base::helpers;
+use swc_ecma_transforms_base::{helpers, resolver::resolver_with_mark};
 use swc_ecma_transforms_typescript::strip;
 use swc_ecma_visit::{Fold, FoldWith};
 use test::Bencher;
@@ -33,7 +33,10 @@ where
 
     let _ = ::testing::run_test(false, |cm, _| {
         let module = module(cm);
-        let module = module.fold_with(&mut strip());
+        let mark = Mark::fresh(Mark::root());
+        let module = module
+            .fold_with(&mut resolver_with_mark(mark))
+            .fold_with(&mut strip(mark));
 
         b.iter(|| {
             let module = module.clone();
@@ -67,13 +70,16 @@ fn common_typescript(b: &mut Bencher) {
 
     let _ = ::testing::run_test(false, |cm, _| {
         let module = module(cm);
-        let module = module.fold_with(&mut strip());
+        let mark = Mark::fresh(Mark::root());
+        let module = module
+            .fold_with(&mut resolver_with_mark(mark))
+            .fold_with(&mut strip(mark));
 
         b.iter(|| {
             let module = module.clone();
 
             let _ = helpers::HELPERS.set(&Default::default(), || {
-                test::black_box(module.fold_with(&mut strip()));
+                test::black_box(module.fold_with(&mut strip(mark)));
             });
         });
 
diff --git a/crates/swc_ecma_transforms_typescript/examples/ts_to_js.rs b/crates/swc_ecma_transforms_typescript/examples/ts_to_js.rs
index f6ffd9c6c7c..ed76b35e3b3 100644
--- a/crates/swc_ecma_transforms_typescript/examples/ts_to_js.rs
+++ b/crates/swc_ecma_transforms_typescript/examples/ts_to_js.rs
@@ -8,11 +8,11 @@ use swc_common::{
     comments::SingleThreadedComments,
     errors::{ColorConfig, Handler},
     sync::Lrc,
-    SourceMap,
+    Mark, SourceMap,
 };
 use swc_ecma_codegen::{text_writer::JsWriter, Emitter};
 use swc_ecma_parser::{lexer::Lexer, Parser, StringInput, Syntax, TsConfig};
-use swc_ecma_transforms_base::fixer::fixer;
+use swc_ecma_transforms_base::{fixer::fixer, hygiene::hygiene, resolver::resolver_with_mark};
 use swc_ecma_transforms_typescript::strip;
 use swc_ecma_visit::FoldWith;
 
@@ -57,10 +57,21 @@ fn main() {
         .map_err(|e| e.into_diagnostic(&handler).emit())
         .expect("failed to parse module.");
 
-    // Remove typescript types
-    let module = module.fold_with(&mut strip());
+    let top_level_mark = Mark::fresh(Mark::root());
 
-    // Ensure that we have eenough parenthesis.
+    // Optionally transforms decorators here before the resolver pass
+    // as it might produce runtime declarations.
+
+    // Conduct identifier scope analysis
+    let module = module.fold_with(&mut resolver_with_mark(top_level_mark));
+
+    // Remove typescript types
+    let module = module.fold_with(&mut strip(top_level_mark));
+
+    // Fix up any identifiers with the same name, but different contexts
+    let module = module.fold_with(&mut hygiene());
+
+    // Ensure that we have enough parenthesis.
     let module = module.fold_with(&mut fixer(Some(&comments)));
 
     let mut buf = vec![];
diff --git a/crates/swc_ecma_transforms_typescript/src/strip.rs b/crates/swc_ecma_transforms_typescript/src/strip.rs
index 6bb136552ef..423d21857e5 100644
--- a/crates/swc_ecma_transforms_typescript/src/strip.rs
+++ b/crates/swc_ecma_transforms_typescript/src/strip.rs
@@ -78,11 +78,12 @@ pub struct Config {
     pub pragma_frag: Option<String>,
 }
 
-pub fn strip_with_config(config: Config) -> impl Fold + VisitMut {
+pub fn strip_with_config(config: Config, top_level_mark: Mark) -> impl Fold + VisitMut {
     as_folder(Strip {
         config,
         comments: NoopComments,
         jsx: None,
+        top_level_ctxt: SyntaxContext::empty().apply_mark(top_level_mark),
         non_top_level: Default::default(),
         scope: Default::default(),
         is_side_effect_import: Default::default(),
@@ -97,8 +98,8 @@ pub fn strip_with_config(config: Config) -> impl Fold + VisitMut {
 ///
 /// See the `examples` directory of the crate to see how you can transpile a
 /// typescript file to a javascript file.
-pub fn strip() -> impl Fold + VisitMut {
-    strip_with_config(Default::default())
+pub fn strip(top_level_mark: Mark) -> impl Fold + VisitMut {
+    strip_with_config(Default::default(), top_level_mark)
 }
 
 /// [strip], but aware of jsx.
@@ -145,6 +146,7 @@ where
             pragma_id,
             pragma_frag_id,
         }),
+        top_level_ctxt: SyntaxContext::empty().apply_mark(top_level_mark),
         non_top_level: Default::default(),
         scope: Default::default(),
         is_side_effect_import: Default::default(),
@@ -189,18 +191,19 @@ where
     jsx: Option<JsxData>,
 
     non_top_level: bool,
+    top_level_ctxt: SyntaxContext,
     scope: Scope,
 
     is_side_effect_import: bool,
     is_type_only_export: bool,
     uninitialized_vars: Vec<VarDeclarator>,
 
-    /// Names of top-level declarations.
-    /// This is used to prevent emittnig a variable with same name multiple
+    /// Names of declarations.
+    /// This is used to prevent emitting a variable with same name multiple
     /// name.
     ///
-    /// If an identifier is in this list, thre [VisitMut] impl should not add a
-    /// varaible with it.
+    /// If an identifier is in this list, the [VisitMut] impl should not add a
+    /// variable with it.
     ///
     /// This field is filled by [Visit] impl and [VisitMut] impl.
     decl_names: AHashSet<Id>,
@@ -1299,7 +1302,11 @@ where
             var.map(|var| {
                 Decl::Var(VarDecl {
                     span: module_span,
-                    kind: VarDeclKind::Var,
+                    kind: if module_name.span.ctxt != self.top_level_ctxt {
+                        VarDeclKind::Let
+                    } else {
+                        VarDeclKind::Var
+                    },
                     declare: false,
                     decls: vec![var],
                 })
@@ -1758,7 +1765,11 @@ where
                     if let Some(var) = self.create_uninit_var(e.span, e.id.to_id()) {
                         stmts.push(Stmt::Decl(Decl::Var(VarDecl {
                             span: DUMMY_SP,
-                            kind: VarDeclKind::Var,
+                            kind: if e.id.span.ctxt != self.top_level_ctxt {
+                                VarDeclKind::Let
+                            } else {
+                                VarDeclKind::Var
+                            },
                             declare: false,
                             decls: vec![var],
                         })));
@@ -2077,7 +2088,11 @@ where
                             span: e.span,
                             decl: Decl::Var(VarDecl {
                                 span: DUMMY_SP,
-                                kind: VarDeclKind::Var,
+                                kind: if e.id.span.ctxt != self.top_level_ctxt {
+                                    VarDeclKind::Let
+                                } else {
+                                    VarDeclKind::Var
+                                },
                                 declare: false,
                                 decls: vec![var],
                             }),
@@ -2087,7 +2102,7 @@ where
                     self.handle_enum(e, &mut stmts)
                 }
                 ModuleItem::Stmt(Stmt::Decl(Decl::TsEnum(e))) => {
-                    // var Foo;
+                    // let Foo;
                     // (function (Foo) {
                     //     Foo[Foo["a"] = 0] = "a";
                     // })(Foo || (Foo = {}));
@@ -2096,7 +2111,11 @@ where
                         stmts.push(
                             Stmt::Decl(Decl::Var(VarDecl {
                                 span: DUMMY_SP,
-                                kind: VarDeclKind::Var,
+                                kind: if e.id.span.ctxt != self.top_level_ctxt {
+                                    VarDeclKind::Let
+                                } else {
+                                    VarDeclKind::Var
+                                },
                                 declare: false,
                                 decls: vec![var],
                             }))
diff --git a/crates/swc_ecma_transforms_typescript/tests/fixture/issue-1653/output.js b/crates/swc_ecma_transforms_typescript/tests/fixture/issue-1653/output.js
index 2680cdd1c0f..01e02b6e341 100644
--- a/crates/swc_ecma_transforms_typescript/tests/fixture/issue-1653/output.js
+++ b/crates/swc_ecma_transforms_typescript/tests/fixture/issue-1653/output.js
@@ -1,6 +1,6 @@
 var X;
 (function(X1) {
-    var Z1;
+    let Z1;
     (function(Z) {
         Z.foo = 0;
     })(Z1 || (Z1 = {
@@ -9,10 +9,12 @@ var X;
 })(X || (X = {
 }));
 var Y;
-(function(Y) {
+(function(Y1) {
+    let Z2;
     (function(Z) {
         Z.bar = 1;
-    })(Z1 || (Z1 = {
+    })(Z2 || (Z2 = {
     }));
+    Y1.Z = Z2;
 })(Y || (Y = {
 }));
diff --git a/crates/swc_ecma_transforms_typescript/tests/fixture/issue-2234/output.js b/crates/swc_ecma_transforms_typescript/tests/fixture/issue-2234/output.js
index 98fc1153e63..61b4871a0a6 100644
--- a/crates/swc_ecma_transforms_typescript/tests/fixture/issue-2234/output.js
+++ b/crates/swc_ecma_transforms_typescript/tests/fixture/issue-2234/output.js
@@ -1,6 +1,6 @@
 var Shapes;
 (function(Shapes1) {
-    var Polygons1;
+    let Polygons1;
     (function(Polygons) {
         class Triangle {
         }
diff --git a/crates/swc_ecma_transforms_typescript/tests/fixture/next/server/render/1/output.js b/crates/swc_ecma_transforms_typescript/tests/fixture/next/server/render/1/output.js
index a076b4889b5..fc8505fbb0a 100644
--- a/crates/swc_ecma_transforms_typescript/tests/fixture/next/server/render/1/output.js
+++ b/crates/swc_ecma_transforms_typescript/tests/fixture/next/server/render/1/output.js
@@ -248,7 +248,7 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
             };
         }
     };
-    let props;
+    let props1;
     const ampState = {
         ampFirst: pageConfig.amp === true,
         hasQuery: Boolean(query.amp),
@@ -256,7 +256,7 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
     };
     const inAmpMode = isInAmpMode(ampState);
     const reactLoadableModules = [];
-    let head = defaultHead(inAmpMode);
+    let head1 = defaultHead(inAmpMode);
     let scriptLoader = {
     };
     const nextExport = !isSSG && (renderOpts.nextExport || dev && (isAutoExport || isFallback));
@@ -266,7 +266,7 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
 
                 <HeadManagerContext.Provider value={{
             updateHead: (state)=>{
-                head = state;
+                head1 = state;
             },
             updateScripts: (scripts)=>{
                 scriptLoader = scripts;
@@ -293,17 +293,17 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
 
         </RouterContext.Provider>
     ;
-    props = await loadGetInitialProps(App, {
+    props1 = await loadGetInitialProps(App, {
         AppTree: ctx.AppTree,
         Component,
         router,
         ctx
     });
     if ((isSSG || getServerSideProps) && isPreview) {
-        props.__N_PREVIEW = true;
+        props1.__N_PREVIEW = true;
     }
     if (isSSG) {
-        props[STATIC_PROPS_ID] = true;
+        props1[STATIC_PROPS_ID] = true;
     }
     if (isSSG && !isFallback) {
         let data;
@@ -384,16 +384,16 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
         } else {
             data.revalidate = false;
         }
-        props.pageProps = Object.assign({
-        }, props.pageProps, "props" in data ? data.props : undefined);
+        props1.pageProps = Object.assign({
+        }, props1.pageProps, "props" in data ? data.props : undefined);
         renderOpts.revalidate = "revalidate" in data ? data.revalidate : undefined;
-        renderOpts.pageData = props;
+        renderOpts.pageData = props1;
         if (renderOpts.isNotFound) {
             return null;
         }
     }
     if (getServerSideProps) {
-        props[SERVER_PROPS_ID] = true;
+        props1[SERVER_PROPS_ID] = true;
     }
     if (getServerSideProps && !isFallback) {
         let data;
@@ -471,19 +471,19 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
         if ((dev || isBuildTimeSSG) && !isSerializableProps(pathname, "getServerSideProps", data.props)) {
             throw new Error("invariant: getServerSideProps did not return valid props. Please report this.");
         }
-        props.pageProps = Object.assign({
-        }, props.pageProps, data.props);
-        renderOpts.pageData = props;
+        props1.pageProps = Object.assign({
+        }, props1.pageProps, data.props);
+        renderOpts.pageData = props1;
     }
-    if (!isSSG && !getServerSideProps && process.env.NODE_ENV !== "production" && Object.keys(props?.pageProps || {
+    if (!isSSG && !getServerSideProps && process.env.NODE_ENV !== "production" && Object.keys(props1?.pageProps || {
     }).includes("url")) {
         console.warn(`The prop \`url\` is a reserved prop in Next.js for legacy reasons and will be overridden on page ${pathname}\n` + `See more info here: https://nextjs.org/docs/messages/reserved-page-prop`);
     }
     if (isDataReq && !isSSG || renderOpts.isRedirect) {
-        return RenderResult.fromStatic(JSON.stringify(props));
+        return RenderResult.fromStatic(JSON.stringify(props1));
     }
     if (isFallback) {
-        props.pageProps = {
+        props1.pageProps = {
         };
     }
     if (isResSent(res) && !isSSG) return null;
@@ -515,21 +515,21 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
                     const html = ReactDOMServer.renderToString(<ErrorDebug error={ctx.err}/>);
                     return {
                         html,
-                        head
+                        head: head1
                     };
                 }
-                if (dev && (props.router || props.Component)) {
+                if (dev && (props1.router || props1.Component)) {
                     throw new Error(`'router' and 'Component' can not be returned in getInitialProps from _app.js https://nextjs.org/docs/messages/cant-override-next-props`);
                 }
                 const { App: EnhancedApp , Component: EnhancedComponent  } = enhanceComponents(options, App, Component);
                 const html = ReactDOMServer.renderToString(<AppContainer >
 
-                        <EnhancedApp Component={EnhancedComponent} router={router} {...props}/>
+                        <EnhancedApp Component={EnhancedComponent} router={router} {...props1}/>
 
                     </AppContainer>);
                 return {
                     html,
-                    head
+                    head: head1
                 };
             };
             const documentCtx = {
@@ -555,7 +555,7 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
         } else {
             const content = ctx.err && ErrorDebug ? <ErrorDebug error={ctx.err}/> : <AppContainer >
 
-                        <App {...props} Component={Component} router={router}/>
+                        <App {...props1} Component={Component} router={router}/>
 
                     </AppContainer>;
             const bodyResult = concurrentFeatures ? await renderToStream(content, generateStaticHTML) : piperFromArray([
@@ -565,7 +565,7 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
                 bodyResult,
                 documentElement: ()=>Document()
                 ,
-                head,
+                head: head1,
                 headTags: [],
                 styles: jsxStyleRegistry.styles()
             };
@@ -590,9 +590,9 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
     const docComponentsRendered = {
     };
     const { assetPrefix , buildId , customServer , defaultLocale , disableOptimizedLoading , domainLocales , locale , locales , runtimeConfig  } = renderOpts;
-    const htmlProps = {
+    const htmlProps1 = {
         __NEXT_DATA__: {
-            props,
+            props: props1,
             page: pathname,
             query,
             buildId,
@@ -637,9 +637,9 @@ export async function renderToHTML(req, res, pathname, query, renderOpts) {
     };
     const documentHTML = ReactDOMServer.renderToStaticMarkup(<AmpStateContext.Provider value={ampState}>
 
-            <HtmlContext.Provider value={htmlProps}>
+            <HtmlContext.Provider value={htmlProps1}>
 
-                {documentResult.documentElement(htmlProps)}
+                {documentResult.documentElement(htmlProps1)}
 
             </HtmlContext.Provider>
 
diff --git a/crates/swc_ecma_transforms_typescript/tests/strip.rs b/crates/swc_ecma_transforms_typescript/tests/strip.rs
index 19573d33329..71a2a58a196 100644
--- a/crates/swc_ecma_transforms_typescript/tests/strip.rs
+++ b/crates/swc_ecma_transforms_typescript/tests/strip.rs
@@ -1,8 +1,8 @@
 use std::path::PathBuf;
 
-use swc_common::chain;
+use swc_common::{chain, pass::Optional, Mark};
 use swc_ecma_parser::{Syntax, TsConfig};
-use swc_ecma_transforms_base::resolver::resolver;
+use swc_ecma_transforms_base::resolver::resolver_with_mark;
 use swc_ecma_transforms_compat::{
     es2015::{block_scoping, destructuring, parameters},
     es2017::async_to_generator,
@@ -14,32 +14,28 @@ use swc_ecma_transforms_typescript::{strip, strip::strip_with_config};
 use swc_ecma_visit::Fold;
 
 fn tr() -> impl Fold {
-    strip_with_config(strip::Config {
-        no_empty_export: true,
-        ..Default::default()
-    })
+    tr_config(None, None)
 }
 
-test!(
-    Syntax::Typescript(Default::default()),
-    |_| chain!(
-        strip(),
-        resolver(),
-        parameters(parameters::Config {
-            ignore_function_length: true
-        }),
-        destructuring(destructuring::Config { loose: false }),
-        block_scoping(),
-    ),
-    fn_len_default_assignment_with_types,
-    "export function transformFileSync(
-      filename: string,
-      opts?: Object = {},
-    ): string {}",
-    "export function transformFileSync(filename, opts) {
-      if (opts === void 0) opts = {};
-    }"
-);
+fn tr_config(
+    config: Option<strip::Config>,
+    decorators_config: Option<decorators::Config>,
+) -> impl Fold {
+    let mark = Mark::fresh(Mark::root());
+    let has_decorators = decorators_config.is_some();
+    let config = config.unwrap_or_else(|| strip::Config {
+        no_empty_export: true,
+        ..Default::default()
+    });
+    chain!(
+        Optional::new(
+            decorators(decorators_config.unwrap_or_default()),
+            has_decorators,
+        ),
+        resolver_with_mark(mark),
+        strip_with_config(config, mark),
+    )
+}
 
 macro_rules! to {
     ($name:ident, $from:expr, $to:expr) => {
@@ -64,7 +60,7 @@ macro_rules! test_with_config {
                 decorators: true,
                 ..Default::default()
             }),
-            |_| strip_with_config($config),
+            |_| tr_config(Some($config), None),
             $name,
             $from,
             $to,
@@ -73,6 +69,26 @@ macro_rules! test_with_config {
     };
 }
 
+test!(
+    Syntax::Typescript(Default::default()),
+    |_| chain!(
+        tr(),
+        parameters(parameters::Config {
+            ignore_function_length: true
+        }),
+        destructuring(destructuring::Config { loose: false }),
+        block_scoping(),
+    ),
+    fn_len_default_assignment_with_types,
+    "export function transformFileSync(
+      filename: string,
+      opts?: Object = {},
+    ): string {}",
+    "export function transformFileSync(filename, opts) {
+      if (opts === void 0) opts = {};
+    }"
+);
+
 to!(
     constructor_01,
     "class Foo {
@@ -237,7 +253,7 @@ const dict = {};"
 
 test!(
     ::swc_ecma_parser::Syntax::Typescript(Default::default()),
-    |_| chain!(tr(), resolver()),
+    |_| tr(),
     issue_392_2,
     "
 import { PlainObject } from 'simplytyped';
@@ -452,6 +468,16 @@ to!(
     export default MyType;"
 );
 
+to!(
+    issue_685_4,
+    "
+    interface MyType {
+        other: number;
+    }
+    export default MyType;",
+    ""
+);
+
 to!(
     ts_enum_str_init,
     "enum FlexSize {
@@ -705,7 +731,7 @@ to!(
   }
 });"#,
     r#"Deno.test("[ws] WebSocket should act as asyncIterator", async ()=>{
-    var Frames;
+    let Frames;
     (function(Frames) {
         Frames[Frames["ping"] = 0] = "ping";
         Frames[Frames["hello"] = 1] = "hello";
@@ -3139,11 +3165,14 @@ test!(
         ..Default::default()
     }),
     |_| {
-        strip_with_config(strip::Config {
-            no_empty_export: true,
-            import_not_used_as_values: strip::ImportsNotUsedAsValues::Preserve,
-            ..Default::default()
-        })
+        tr_config(
+            Some(strip::Config {
+                no_empty_export: true,
+                import_not_used_as_values: strip::ImportsNotUsedAsValues::Preserve,
+                ..Default::default()
+            }),
+            None,
+        )
     },
     deno_7413_3,
     "
@@ -3272,11 +3301,14 @@ test!(
     Syntax::Typescript(TsConfig {
         ..Default::default()
     }),
-    |_| strip_with_config(strip::Config {
-        use_define_for_class_fields: true,
-        no_empty_export: true,
-        ..Default::default()
-    }),
+    |_| tr_config(
+        Some(strip::Config {
+            use_define_for_class_fields: true,
+            no_empty_export: true,
+            ..Default::default()
+        }),
+        None
+    ),
     compile_to_class_constructor_collision_ignores_types,
     r#"
 class C {
@@ -3305,7 +3337,7 @@ test!(
         decorators: true,
         ..Default::default()
     }),
-    |_| chain!(resolver(), decorators(Default::default()), tr()),
+    |_| tr_config(None, Some(Default::default())),
     issue_367,
     "
 
@@ -3325,13 +3357,13 @@ class A {
 }",
     "import { bind } from 'some';
 let A = _decorate([], function(_initialize) {
-    class A{
+    class A1{
         constructor(){
             _initialize(this);
         }
     }
     return {
-        F: A,
+        F: A1,
         d: [{
                 kind: 'get',
                 decorators: [bind],
@@ -3419,7 +3451,6 @@ to!(
         util1.objectValues = (obj) => {
         };
     })(util || (util = {}));
-
     "
 );
 
@@ -3482,7 +3513,7 @@ to!(
     "
     var Test;
     (function(Test1) {
-        var DummyValues;
+        let DummyValues;
         (function(DummyValues) {
             DummyValues['A'] = 'A';
             DummyValues['B'] = 'B';
@@ -4222,6 +4253,95 @@ to!(
 })(Color || (Color = {}));"
 );
 
+to!(
+    issue_2886_enum_namespace_block_scoping,
+    "
+export enum Enum {
+    test = 1
+}
+namespace Namespace {
+    export enum Enum {
+        test = 1
+    }
+    export enum Enum {
+        test2 = 1
+    }
+}
+{
+    enum Enum {
+        test = 1
+    }
+    namespace Namespace {
+        export enum Enum {
+            test = 1
+        }
+    }
+}
+{
+    enum Enum {
+        test = 1
+    }
+    namespace Namespace {
+        export enum Enum {
+            test = 1
+        }
+    }
+}
+",
+    r#"
+export var Enum;
+(function (Enum) {
+    Enum[Enum["test"] = 1] = "test";
+})(Enum || (Enum = {}));
+var Namespace;
+(function(Namespace1) {
+    let Enum;
+    (function(Enum) {
+        Enum[Enum["test"] = 1] = "test";
+    })(Enum || (Enum = {
+    }));
+    (function(Enum) {
+        Enum[Enum["test2"] = 1] = "test2";
+    })(Enum || (Enum = {
+    }));
+    Namespace1.Enum = Enum;
+})(Namespace || (Namespace = {
+}));
+{
+    let Enum;
+    (function (Enum) {
+        Enum[Enum["test"] = 1] = "test";
+    })(Enum || (Enum = {}));
+    let Namespace2;
+    (function(Namespace) {
+        let Enum;
+        (function(Enum) {
+            Enum[Enum["test"] = 1] = "test";
+        })(Enum || (Enum = {
+        }));
+        Namespace.Enum = Enum;
+    })(Namespace2 || (Namespace2 = {
+    }));
+}
+{
+    let Enum;
+    (function (Enum) {
+        Enum[Enum["test"] = 1] = "test";
+    })(Enum || (Enum = {}));
+    let Namespace3;
+    (function(Namespace) {
+        let Enum;
+        (function(Enum) {
+            Enum[Enum["test"] = 1] = "test";
+        })(Enum || (Enum = {
+        }));
+        Namespace.Enum = Enum;
+    })(Namespace3 || (Namespace3 = {
+    }));
+}
+    "#
+);
+
 #[testing::fixture("tests/fixture/**/input.ts")]
 #[testing::fixture("tests/fixture/**/input.tsx")]
 fn exec(input: PathBuf) {
diff --git a/crates/swc_ecma_transforms_typescript/tests/strip_correctness.rs b/crates/swc_ecma_transforms_typescript/tests/strip_correctness.rs
index 7b1d4a34061..4ad9a3c24ca 100644
--- a/crates/swc_ecma_transforms_typescript/tests/strip_correctness.rs
+++ b/crates/swc_ecma_transforms_typescript/tests/strip_correctness.rs
@@ -3,11 +3,11 @@ use std::{
     path::PathBuf,
     sync::{Arc, RwLock},
 };
-use swc_common::FileName;
+use swc_common::{FileName, Mark};
 use swc_ecma_ast::*;
 use swc_ecma_codegen::{self, Emitter};
 use swc_ecma_parser::{lexer::Lexer, EsConfig, Parser, StringInput, Syntax, TsConfig};
-use swc_ecma_transforms_base::fixer::fixer;
+use swc_ecma_transforms_base::{fixer::fixer, hygiene::hygiene, resolver::resolver_with_mark};
 use swc_ecma_transforms_typescript::{strip, strip::strip_with_config};
 use swc_ecma_visit::{Fold, FoldWith};
 
@@ -123,11 +123,17 @@ fn identity(entry: PathBuf) {
             let module = parser
                 .parse_typescript_module()
                 .map(|p| {
-                    p.fold_with(&mut strip_with_config(strip::Config {
-                        no_empty_export: true,
-                        ..Default::default()
-                    }))
-                    .fold_with(&mut fixer(None))
+                    let mark = Mark::fresh(Mark::root());
+                    p.fold_with(&mut resolver_with_mark(mark))
+                        .fold_with(&mut strip_with_config(
+                            strip::Config {
+                                no_empty_export: true,
+                                ..Default::default()
+                            },
+                            mark,
+                        ))
+                        .fold_with(&mut hygiene())
+                        .fold_with(&mut fixer(None))
                 })
                 .map_err(|e| {
                     eprintln!("failed to parse as typescript module");
diff --git a/crates/swc_estree_compat/benches/babelify.rs b/crates/swc_estree_compat/benches/babelify.rs
index 9e1527cf08a..fc2768b82fe 100644
--- a/crates/swc_estree_compat/benches/babelify.rs
+++ b/crates/swc_estree_compat/benches/babelify.rs
@@ -5,10 +5,10 @@ extern crate test;
 
 use std::{hint::black_box, io::stderr, sync::Arc};
 use swc::config::IsModule;
-use swc_common::{errors::Handler, FileName, FilePathMapping, SourceFile, SourceMap};
+use swc_common::{errors::Handler, FileName, FilePathMapping, Mark, SourceFile, SourceMap};
 use swc_ecma_ast::{EsVersion, Program};
 use swc_ecma_parser::Syntax;
-use swc_ecma_transforms::{compat::es2020, typescript};
+use swc_ecma_transforms::{compat::es2020, resolver_with_mark, typescript};
 use swc_ecma_visit::FoldWith;
 use swc_estree_compat::babelify::{Babelify, Context};
 use test::Bencher;
@@ -54,8 +54,10 @@ fn babelify_only(b: &mut Bencher) {
     let handler = Handler::with_emitter_writer(Box::new(stderr()), Some(c.cm.clone()));
 
     let module = c.run_transform(&handler, false, || {
+        let mark = Mark::fresh(Mark::root());
         module
-            .fold_with(&mut typescript::strip())
+            .fold_with(&mut resolver_with_mark(mark))
+            .fold_with(&mut typescript::strip(mark))
             .fold_with(&mut es2020(Default::default()))
     });
 
diff --git a/crates/swc_node_bundler/benches/bench.rs b/crates/swc_node_bundler/benches/bench.rs
index 2bb88dcc98e..7368ea2afe8 100644
--- a/crates/swc_node_bundler/benches/bench.rs
+++ b/crates/swc_node_bundler/benches/bench.rs
@@ -14,10 +14,10 @@ use std::{
 use swc::resolver::NodeResolver;
 use swc_atoms::js_word;
 use swc_bundler::{Bundler, Load, ModuleData, ModuleRecord};
-use swc_common::{sync::Lrc, FileName, SourceMap, Span, GLOBALS};
+use swc_common::{sync::Lrc, FileName, Mark, SourceMap, Span, GLOBALS};
 use swc_ecma_ast::*;
 use swc_ecma_parser::{lexer::Lexer, Parser, StringInput, Syntax, TsConfig};
-use swc_ecma_transforms::typescript::strip;
+use swc_ecma_transforms::{resolver_with_mark, typescript::strip};
 use swc_ecma_visit::FoldWith;
 use test::Bencher;
 
@@ -88,7 +88,11 @@ impl Load for Loader {
 
         let mut parser = Parser::new_from(lexer);
         let module = parser.parse_module().unwrap();
-        let module = module.fold_with(&mut strip());
+
+        let mark = Mark::fresh(Mark::root());
+        let module = module
+            .fold_with(&mut resolver_with_mark(mark))
+            .fold_with(&mut strip(mark));
         Ok(ModuleData {
             fm,
             module,