fix(es/compat): Fix destructuring of an empty array (#6314)

crates/swc_ecma_transforms_compat/src/es2015/destructuring.rs

@@ -160,8 +160,9 @@ impl AssignFolder {
                 if is_literal(&init) {
                     match *init {
                         Expr::Array(arr)
-                            if elems.len() == arr.elems.len()
+                            if !elems.is_empty()
-                                || (elems.len() < arr.elems.len() && has_rest_pat(&elems)) =>
+                                && (elems.len() == arr.elems.len()
+                                    || (elems.len() < arr.elems.len() && has_rest_pat(&elems))) =>
                         {
                             let mut arr_elems = Some(arr.elems.into_iter());
                             elems.into_iter().for_each(|p| match p {

crates/swc_ecma_transforms_compat/tests/es2015_destructuring.rs

@@ -2261,3 +2261,27 @@ test!(
     "let [x] = [,];",
     "let x;"
 );
+
+test!(
+    syntax(),
+    |_| tr(),
+    issue_6304,
+    "let [] = [];",
+    "let ref = [];"
+);
+
+test!(
+    syntax(),
+    |_| tr(),
+    issue_6304_1,
+    "let [] = [,];",
+    "let ref = [,];"
+);
+
+test!(
+    syntax(),
+    |_| tr(),
+    issue_6304_2,
+    "let [] = [...[1, 2, 3]];",
+    "let ref = [...[1, 2, 3]];"
+);