fix(es/decorators): Use correct class name reference (#9375)

- Closes #9350

.changeset/flat-geese-care.md

@@ -0,0 +1,5 @@
+---
+swc_ecma_transforms_proposal: patch
+---
+
+fix(es/decorator): Use correct class name reference

crates/swc/tests/fixture/issues-9xxx/9350/input/.swcrc

@@ -0,0 +1,13 @@
+{
+  "jsc": {
+    "parser": {
+      "syntax": "typescript",
+      "decorators": true
+    },
+    "target": "es2016"
+  },
+  "module": {
+    "type": "es6"
+  },
+  "isModule": true
+}

crates/swc/tests/fixture/issues-9xxx/9350/input/index.ts

@@ -0,0 +1,18 @@
+function registerHook(key) {
+    return (...args) => console.log(args);
+}
+
+export default function design(base: typeof Component) {
+    return class Design extends base {
+        copy() {
+            console.log("copy");
+        }
+
+        @registerHook("beforeRender")
+        @registerHook("afterRender")
+        render() {
+            super.render();
+            console.log("design render");
+        }
+    };
+}

crates/swc/tests/fixture/issues-9xxx/9350/input/test.ts

@@ -0,0 +1,19 @@
+function registerHook(key) {
+    return (...args) => console.log(args);
+}
+
+export default function design(base: typeof Component) {
+    const Design = "test name conflict";
+    return class Design extends base {
+        copy() {
+            console.log("copy");
+        }
+
+        @registerHook("beforeRender")
+        @registerHook("afterRender")
+        render() {
+            super.render();
+            console.log("design render");
+        }
+    };
+}

crates/swc/tests/fixture/issues-9xxx/9350/output/index.ts

@@ -0,0 +1,19 @@
+import { _ as _ts_decorate } from "@swc/helpers/_/_ts_decorate";
+function registerHook(key) {
+    return (...args)=>console.log(args);
+}
+export default function design(base) {
+    var Design;
+    return Design = class Design extends base {
+        copy() {
+            console.log("copy");
+        }
+        render() {
+            super.render();
+            console.log("design render");
+        }
+    }, _ts_decorate([
+        registerHook("beforeRender"),
+        registerHook("afterRender")
+    ], Design.prototype, "render", null), Design;
+}

crates/swc/tests/fixture/issues-9xxx/9350/output/test.ts

@@ -0,0 +1,20 @@
+import { _ as _ts_decorate } from "@swc/helpers/_/_ts_decorate";
+function registerHook(key) {
+    return (...args)=>console.log(args);
+}
+export default function design(base) {
+    const Design = "test name conflict";
+    var Design1;
+    return Design1 = class Design1 extends base {
+        copy() {
+            console.log("copy");
+        }
+        render() {
+            super.render();
+            console.log("design render");
+        }
+    }, _ts_decorate([
+        registerHook("beforeRender"),
+        registerHook("afterRender")
+    ], Design1.prototype, "render", null), Design1;
+}

crates/swc_ecma_transforms_proposal/src/decorators/legacy/mod.rs

@@ -332,14 +332,16 @@ impl VisitMut for TscDecorator {
             return;
         }
 
-        let var_name = private_ident!("_class");
-        let ident = n.ident.get_or_insert_with(|| var_name.clone());
+        let ident = n
+            .ident
+            .get_or_insert_with(|| private_ident!("_class"))
+            .clone();
 
         let old = mem::replace(&mut self.class_name, Some(ident.clone()));
 
         n.visit_mut_children_with(self);
 
-        self.assign_class_expr_to = Some(var_name);
+        self.assign_class_expr_to = Some(ident);
 
         self.class_name = old;
     }