diff --git a/crates/swc/tests/fixture/issue-2423/input/.swcrc b/crates/swc/tests/fixture/issue-2423/input/.swcrc
new file mode 100644
index 00000000000..d1eac6f408d
--- /dev/null
+++ b/crates/swc/tests/fixture/issue-2423/input/.swcrc
@@ -0,0 +1,15 @@
+{
+    "module": {
+        "type": "commonjs"
+    },
+    "exclude": [
+        ".*.js$"
+    ],
+    "jsc": {
+        "parser": {
+            "syntax": "typescript"
+        },
+        "target": "es2016"
+    },
+    "sourceMaps": true
+}
\ No newline at end of file
diff --git a/crates/swc/tests/fixture/issue-2423/input/index.ts b/crates/swc/tests/fixture/issue-2423/input/index.ts
new file mode 100644
index 00000000000..fdba7059ea1
--- /dev/null
+++ b/crates/swc/tests/fixture/issue-2423/input/index.ts
@@ -0,0 +1,6 @@
+namespace A {
+    export const v = 25;
+    export function a() {
+        console.log(v);
+    }
+}
\ No newline at end of file
diff --git a/crates/swc/tests/fixture/issue-2423/output/index.map b/crates/swc/tests/fixture/issue-2423/output/index.map
new file mode 100644
index 00000000000..38bef3f209c
--- /dev/null
+++ b/crates/swc/tests/fixture/issue-2423/output/index.map
@@ -0,0 +1,17 @@
+{
+  "mappings": "Y;AAAA,GAAS;;QACQA,CAAC,MAADA,CAAC,GAAG,EAAE;aACHC,CAAC,GAAG,CAAC;QACjBC,OAAO,CAACC,GAAG,CAACH,CAAC,CAAC,CAAC;IACnB,CAAC;OAFeC,CAAC,GAADA,CAAC,A;GAFXG,CAAC,KAADA,CAAC,O",
+  "names": [
+    "v",
+    "a",
+    "console",
+    "log",
+    "A"
+  ],
+  "sources": [
+    "../../input/index.ts"
+  ],
+  "sourcesContent": [
+    "namespace A {\n    export const v = 25;\n    export function a() {\n        console.log(v);\n    }\n}"
+  ],
+  "version": 3
+}
diff --git a/crates/swc/tests/fixture/issue-2423/output/index.ts b/crates/swc/tests/fixture/issue-2423/output/index.ts
new file mode 100644
index 00000000000..972bc933d51
--- /dev/null
+++ b/crates/swc/tests/fixture/issue-2423/output/index.ts
@@ -0,0 +1,9 @@
+"use strict";
+var A;
+(function(A1) {
+    var v = A1.v = 25;
+    function a() {
+        console.log(v);
+    }
+    A1.a = a;
+})(A || (A = {}));
diff --git a/crates/swc/tests/fixture/issue-2636/input/.swcrc b/crates/swc/tests/fixture/issue-2636/input/.swcrc
new file mode 100644
index 00000000000..e4d496ade75
--- /dev/null
+++ b/crates/swc/tests/fixture/issue-2636/input/.swcrc
@@ -0,0 +1,18 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "typescript",
+            "tsx": false
+        },
+        "target": "es5",
+        "loose": false,
+        "minify": {
+            "compress": false,
+            "mangle": false
+        }
+    },
+    "module": {
+        "type": "es6"
+    },
+    "minify": false
+}
\ No newline at end of file
diff --git a/crates/swc/tests/fixture/issue-2636/input/index.ts b/crates/swc/tests/fixture/issue-2636/input/index.ts
new file mode 100644
index 00000000000..4687444e984
--- /dev/null
+++ b/crates/swc/tests/fixture/issue-2636/input/index.ts
@@ -0,0 +1,5 @@
+export module RuleInterpreterHelper {
+    export const fieldNameMap: [string, string][] = [];
+
+    export const fieldNameHashMap: Map<string, string> = new Map(fieldNameMap);
+}
diff --git a/crates/swc/tests/fixture/issue-2636/output/index.ts b/crates/swc/tests/fixture/issue-2636/output/index.ts
new file mode 100644
index 00000000000..ea47d38c574
--- /dev/null
+++ b/crates/swc/tests/fixture/issue-2636/output/index.ts
@@ -0,0 +1,5 @@
+export var RuleInterpreterHelper;
+(function(RuleInterpreterHelper1) {
+    var fieldNameMap = RuleInterpreterHelper1.fieldNameMap = [];
+    var fieldNameHashMap = RuleInterpreterHelper1.fieldNameHashMap = new Map(fieldNameMap);
+})(RuleInterpreterHelper || (RuleInterpreterHelper = {}));