fix(es/transforms/strip): Strip types for typescript export equals (#2623)

swc_ecma_transforms_typescript:
 - `strip`: Visit the RHS of typescript export equals.

ecmascript/transforms/typescript/src/strip.rs

@@ -2158,7 +2158,9 @@ where
                     }
                 }
 
-                ModuleItem::ModuleDecl(ModuleDecl::TsExportAssignment(export)) => {
+                ModuleItem::ModuleDecl(ModuleDecl::TsExportAssignment(mut export)) => {
+                    export.expr.visit_mut_with(self);
+
                     stmts.push(ModuleItem::Stmt(Stmt::Expr(ExprStmt {
                         span: export.span,
                         expr: Box::new(Expr::Assign(AssignExpr {

ecmascript/transforms/typescript/tests/strip.rs

@@ -4176,6 +4176,20 @@ test_with_config!(
     "
 );
 
+to!(
+    issue_2613,
+    "
+    export = function (foo: string, bar: number): boolean {
+        return true
+    };
+    ",
+    "
+    module.exports = function (foo, bar) {
+        return true
+    };
+    "
+);
+
 #[testing::fixture("tests/fixture/**/input.ts")]
 #[testing::fixture("tests/fixture/**/input.tsx")]
 fn exec(input: PathBuf) {

tests/fixture/issue-2613/1/input/.swcrc

@@ -0,0 +1,10 @@
+{
+  "jsc": {
+    "parser": {
+      "syntax": "typescript"
+    }
+  },
+  "module": {
+    "type": "commonjs"
+  }
+}

tests/fixture/issue-2613/1/input/index.ts

@@ -0,0 +1,3 @@
+export = function (foo: string, bar: number): boolean {
+  return true
+}

tests/fixture/issue-2613/1/output/index.ts

@@ -0,0 +1,7 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+module.exports = function(foo, bar) {
+    return true;
+};