From 0178f4ed3187dff439ed3097c8c89555b2a6749f Mon Sep 17 00:00:00 2001
From: ygj6 <7699524+ygj6@users.noreply.github.com>
Date: Mon, 6 Sep 2021 05:35:13 +0800
Subject: [PATCH] fix(ref-transform): not transform the prototype attributes.
 (#4503)

fix #4502
---
 packages/ref-transform/__tests__/refTransform.spec.ts | 8 ++++++++
 packages/ref-transform/src/refTransform.ts            | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/packages/ref-transform/__tests__/refTransform.spec.ts b/packages/ref-transform/__tests__/refTransform.spec.ts
index b4b3473741c..1b9f3003bfb 100644
--- a/packages/ref-transform/__tests__/refTransform.spec.ts
+++ b/packages/ref-transform/__tests__/refTransform.spec.ts
@@ -395,4 +395,12 @@ describe('errors', () => {
       `$computed can only be used as the initializer`
     )
   })
+
+  test('not transform the prototype attributes', () => {
+    const { code } = transform(`
+    const hasOwnProperty = Object.prototype.hasOwnProperty
+    const hasOwn = (val, key) => hasOwnProperty.call(val, key)
+    `)
+    expect(code).not.toMatch('.value')
+  })
 })
diff --git a/packages/ref-transform/src/refTransform.ts b/packages/ref-transform/src/refTransform.ts
index 7fae8562e0c..bfed7311b84 100644
--- a/packages/ref-transform/src/refTransform.ts
+++ b/packages/ref-transform/src/refTransform.ts
@@ -20,7 +20,7 @@ import {
   walkFunctionParams
 } from '@vue/compiler-core'
 import { parse, ParserPlugin } from '@babel/parser'
-import { babelParserDefaultPlugins } from '@vue/shared'
+import { babelParserDefaultPlugins, hasOwn } from '@vue/shared'
 
 const TO_VAR_SYMBOL = '$'
 const TO_REF_SYMBOL = '$$'
@@ -309,7 +309,7 @@ export function transformAST(
     parent: Node,
     parentStack: Node[]
   ): boolean {
-    if (id.name in scope) {
+    if (hasOwn(scope, id.name)) {
       if (scope[id.name]) {
         if (isStaticProperty(parent) && parent.shorthand) {
           // let binding used in a property shorthand