fix(es/parser): Allow as in destructuring assignment (#5948)

crates/swc_ecma_parser/src/parser/expr/tests.rs

@@ -510,6 +510,15 @@ fn issue_3672_2() {
     );
 }
 
+#[test]
+fn issue_5947() {
+    test_parser(
+        "[a as number, b as number, c as string] = [1, 2, '3']",
+        Syntax::Typescript(Default::default()),
+        |p| p.parse_module(),
+    );
+}
+
 #[bench]
 fn bench_new_expr_ts(b: &mut Bencher) {
     bench_parser(

crates/swc_ecma_parser/src/parser/pat.rs

@@ -566,7 +566,8 @@ impl<I: Tokens> Parser<I> {
                 | Expr::Fn(..)
                 | Expr::Class(..)
                 | Expr::Paren(..)
-                | Expr::Tpl(..) => {
+                | Expr::Tpl(..)
+                | Expr::TsAs(..) => {
                     if !expr.is_valid_simple_assignment_target(self.ctx().strict) {
                         self.emit_err(span, SyntaxError::NotSimpleAssign)
                     }

crates/swc_ecma_transforms_typescript/tests/fixture/issue-5947/input.ts

@@ -0,0 +1,2 @@
+let a, b;
+[a as number, b as number] = [1, 2];

crates/swc_ecma_transforms_typescript/tests/fixture/issue-5947/output.js

@@ -0,0 +1,2 @@
+let a, b;
+[a, b] = [1, 2];