From 2de45fb0f7f0afbf2a15a6a27776a43faacebffc Mon Sep 17 00:00:00 2001
From: Austaras <austaras@outlook.com>
Date: Sun, 6 Nov 2022 02:31:02 +0800
Subject: [PATCH] fix(es/compat): Handle a nullish coalescing in a switch case
 (#6363)

---
 .../src/es2020/nullish_coalescing/mod.rs              |  4 +++-
 .../src/es2020/nullish_coalescing/tests.rs            | 11 +++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/crates/swc_ecma_transforms_compat/src/es2020/nullish_coalescing/mod.rs b/crates/swc_ecma_transforms_compat/src/es2020/nullish_coalescing/mod.rs
index 0555316843ca..ece24839d67c 100644
--- a/crates/swc_ecma_transforms_compat/src/es2020/nullish_coalescing/mod.rs
+++ b/crates/swc_ecma_transforms_compat/src/es2020/nullish_coalescing/mod.rs
@@ -74,8 +74,10 @@ impl VisitMut for NullishCoalescing {
 
     /// Prevents #1123
     fn visit_mut_switch_case(&mut self, s: &mut SwitchCase) {
+        // Prevents #6328
+        s.test.visit_mut_with(self);
         let old_vars = self.vars.take();
-        s.visit_mut_children_with(self);
+        s.cons.visit_mut_with(self);
         self.vars = old_vars;
     }
 
diff --git a/crates/swc_ecma_transforms_compat/src/es2020/nullish_coalescing/tests.rs b/crates/swc_ecma_transforms_compat/src/es2020/nullish_coalescing/tests.rs
index d4623f1b45c3..13a3c615c3f6 100644
--- a/crates/swc_ecma_transforms_compat/src/es2020/nullish_coalescing/tests.rs
+++ b/crates/swc_ecma_transforms_compat/src/es2020/nullish_coalescing/tests.rs
@@ -166,3 +166,14 @@ function foo(opts) {
 }
 "#
 );
+
+test!(
+    syntax(),
+    |_| tr(Default::default()),
+    issue_6328,
+    "switch ( 0 ) { case 0 ?? 0 : }",
+    r#"
+    var ref;
+    switch ( 0 ) { case (ref = 0) !== null && ref !== void 0 ? ref : 0: }
+"#
+);