From bae79ddf8564a2da4a5365cfeb8d811990f42335 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=99=BD=E9=9B=BE=E4=B8=89=E8=AF=AD?=
 <32354856+baiwusanyu-c@users.noreply.github.com>
Date: Tue, 19 Dec 2023 17:08:46 +0800
Subject: [PATCH] fix(compiler-core): fix v-on with modifiers on inline
 expression of undefined (#9866)

close #9865
improve isMemberExpression check for undefined
---
 packages/compiler-core/__tests__/utils.spec.ts | 4 ++++
 packages/compiler-core/src/utils.ts            | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/compiler-core/__tests__/utils.spec.ts b/packages/compiler-core/__tests__/utils.spec.ts
index 45fa46fea7a..f2ea70cc51d 100644
--- a/packages/compiler-core/__tests__/utils.spec.ts
+++ b/packages/compiler-core/__tests__/utils.spec.ts
@@ -122,6 +122,10 @@ describe('isMemberExpression', () => {
     expect(fn(`123[a]`)).toBe(true)
     expect(fn(`foo() as string`)).toBe(false)
     expect(fn(`a + b as string`)).toBe(false)
+    // #9865
+    expect(fn('""')).toBe(false)
+    expect(fn('undefined')).toBe(false)
+    expect(fn('null')).toBe(false)
   })
 })
 
diff --git a/packages/compiler-core/src/utils.ts b/packages/compiler-core/src/utils.ts
index baffe5086f6..fe4141507bc 100644
--- a/packages/compiler-core/src/utils.ts
+++ b/packages/compiler-core/src/utils.ts
@@ -163,7 +163,7 @@ export const isMemberExpressionNode = __BROWSER__
         return (
           ret.type === 'MemberExpression' ||
           ret.type === 'OptionalMemberExpression' ||
-          ret.type === 'Identifier'
+          (ret.type === 'Identifier' && ret.name !== 'undefined')
         )
       } catch (e) {
         return false