fix(es/compat): Set inserted var inside export class in destructing (#…

…8470)

crates/swc_ecma_compat_es2015/src/destructuring.rs

@@ -565,6 +565,24 @@ impl VisitMut for AssignFolder {
         self.exporting = exporting;
     }
 
+    fn visit_mut_class(&mut self, f: &mut Class) {
+        let exporting = mem::replace(&mut self.exporting, false);
+        f.visit_mut_children_with(self);
+        self.exporting = exporting;
+    }
+
+    fn visit_mut_object_lit(&mut self, f: &mut ObjectLit) {
+        let exporting = mem::replace(&mut self.exporting, false);
+        f.visit_mut_children_with(self);
+        self.exporting = exporting;
+    }
+
+    fn visit_mut_arrow_expr(&mut self, f: &mut ArrowExpr) {
+        let exporting = mem::replace(&mut self.exporting, false);
+        f.visit_mut_children_with(self);
+        self.exporting = exporting;
+    }
+
     fn visit_mut_expr(&mut self, expr: &mut Expr) {
         let ignore_return_value = self.ignore_return_value.take().is_some();
 

crates/swc_ecma_transforms_compat/tests/destructuring/pr-8470/input.js

@@ -0,0 +1,3 @@
+export class A {
+    constructor(t, { a, b = 6, c } = {}) {}
+}

crates/swc_ecma_transforms_compat/tests/destructuring/pr-8470/output.js

@@ -0,0 +1,5 @@
+export class A {
+    constructor(t, ref){
+        let _ref = ref === void 0 ? {} : ref, a = _ref.a, _ref_b = _ref.b, b = _ref_b === void 0 ? 6 : _ref_b, c = _ref.c;
+    }
+}