fix(es/compat): Destructuring of export class/funtion

crates/swc/tests/fixture/issues-8xxx/8366/input/.swcrc

@@ -0,0 +1,21 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "typescript",
+            "tsx": false
+        },
+        "loose": false,
+        "minify": {
+            "compress": false,
+            "mangle": false
+        }
+    },
+    "module": {
+        "type": "es6"
+    },
+    "minify": false,
+    "isModule": true,
+    "env": {
+        "targets": "Chrome >= 50"
+    }
+}

crates/swc/tests/fixture/issues-8xxx/8366/input/index.js

@@ -0,0 +1,5 @@
+export class F {
+    a({ b, c } = undefined) { }
+}
+
+export function f({ b, c } = undefined) { }

crates/swc/tests/fixture/issues-8xxx/8366/output/index.js

@@ -0,0 +1,8 @@
+export class F {
+    a(ref) {
+        let _ref = ref === void 0 ? undefined : ref, b = _ref.b, c = _ref.c;
+    }
+}
+export function f(ref) {
+    let _ref = ref === void 0 ? undefined : ref, b = _ref.b, c = _ref.c;
+}

crates/swc_ecma_compat_es2015/src/destructuring.rs

@@ -1,4 +1,4 @@
-use std::iter;
+use std::{iter, mem};
 
 use serde::Deserialize;
 use swc_common::{util::take::Take, Spanned, SyntaxContext, DUMMY_SP};
@@ -559,6 +559,12 @@ impl VisitMut for AssignFolder {
         self.exporting = old;
     }
 
+    fn visit_mut_function(&mut self, f: &mut Function) {
+        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();