fix(es/typescript): Preserve more comments (#9509)

**Related issue:**

- Closes #9505

Author: magic-akari

.changeset/silly-mugs-heal.md

@@ -0,0 +1,5 @@
+---
+swc_ecma_transforms_typescript: patch
+---
+
+fix(es/typescript): Preserve more comments

crates/swc/tests/fixture/issues-9xxx/9505/input/.swcrc

@@ -0,0 +1,15 @@
+{
+  "minify": false,
+  "jsc": {
+    "parser": {
+      "syntax": "typescript"
+    },
+    "target": "es2022",
+    "minify": {
+      "mangle": false,
+      "format": {
+        "comments": "all"
+      }
+    }
+  }
+}

crates/swc/tests/fixture/issues-9xxx/9505/input/index.ts

@@ -0,0 +1,5 @@
+;// a.ts
+const a = 1
+
+;// b.ts
+const b = 2

crates/swc/tests/fixture/issues-9xxx/9505/output/index.ts

@@ -0,0 +1,3 @@
+; // a.ts
+const a = 1; // b.ts
+const b = 2;

crates/swc/tests/tsc-references/generatorTypeCheck59.1.normal.js

@@ -7,4 +7,5 @@ function* g() {
     _ts_decorate([
         (yield "")
     ], C.prototype, "m", null);
+    ;
 }

crates/swc/tests/tsc-references/generatorTypeCheck60.1.normal.js

@@ -2,4 +2,5 @@
 function* g() {
     class C extends (yield) {
     }
+    ;
 }

crates/swc/tests/tsc-references/generatorTypeCheck61.1.normal.js

@@ -6,4 +6,5 @@ function* g() {
     C = _ts_decorate([
         (yield 0)
     ], C);
+    ;
 }

crates/swc/tests/tsc-references/parserDoStatement2.1.normal.js

@@ -1,3 +1,5 @@
 //// [parserDoStatement2.ts]
-do {}while (false);
+do {
+    ;
+}while (false);
 false;

crates/swc/tests/tsc-references/parserSbp_7.9_A9_T3.1.normal.js

@@ -7,5 +7,7 @@
  * @path bestPractice/Sbp_7.9_A9_T3.js
  * @description Execute do { \n ; \n }while(false) true
  */ //CHECK#1
-do {}while (false);
+do {
+    ;
+}while (false);
 true;

crates/swc/tests/tsc-references/superInStaticMembers1(target=es2015).1.normal.js

@@ -50,6 +50,7 @@ C._ = [
         _get(_get_prototype_of(C), "w", C).call(C);
     })(),
     (()=>{
+        ; // no collision
         _get(_get_prototype_of(C), "w", C).call(C);
     })(),
     (()=>{

crates/swc/tests/tsc-references/superInStaticMembers1(target=es2021).1.normal.js

@@ -50,6 +50,7 @@ C._ = [
         _get(_get_prototype_of(C), "w", C).call(C);
     })(),
     (()=>{
+        ; // no collision
         _get(_get_prototype_of(C), "w", C).call(C);
     })(),
     (()=>{

crates/swc/tests/tsc-references/superInStaticMembers1(target=es2022).1.normal.js

@@ -48,6 +48,7 @@ class C extends B {
                 super.w();
             })(),
             (()=>{
+                ; // no collision
                 super.w();
             })(),
             (()=>{

crates/swc/tests/tsc-references/superInStaticMembers1(target=es5).1.normal.js

@@ -69,6 +69,7 @@ C._ = [
         _get(_get_prototype_of(C), "w", C).call(C);
     }(),
     function() {
+        ; // no collision
         _get(_get_prototype_of(C), "w", C).call(C);
     }(),
     function() {

crates/swc/tests/tsc-references/superInStaticMembers1(target=esnext).1.normal.js

@@ -48,6 +48,7 @@ class C extends B {
                 super.w();
             })(),
             (()=>{
+                ; // no collision
                 super.w();
             })(),
             (()=>{

crates/swc_ecma_transforms_typescript/src/strip_type.rs

@@ -206,7 +206,7 @@ impl VisitMut for StripType {
 
     fn visit_mut_stmts(&mut self, n: &mut Vec<Stmt>) {
         n.visit_mut_children_with(self);
-        n.retain(|s| !s.is_empty());
+        n.retain(|s| !matches!(s, Stmt::Empty(e) if e.span.is_dummy()));
     }
 
     fn visit_mut_stmt(&mut self, n: &mut Stmt) {