From e68321eac0233a1e45d3169611b9091eec83410f Mon Sep 17 00:00:00 2001
From: Chester <291164091@qq.com>
Date: Sat, 12 Oct 2019 10:04:33 +0800
Subject: [PATCH] chore: use '' instead of undefined (#205)

---
 packages/reactivity/src/ref.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/reactivity/src/ref.ts b/packages/reactivity/src/ref.ts
index 5aac9272bf..3616799e36 100644
--- a/packages/reactivity/src/ref.ts
+++ b/packages/reactivity/src/ref.ts
@@ -3,7 +3,7 @@ import { OperationTypes } from './operations'
 import { isObject } from '@vue/shared'
 import { reactive } from './reactive'
 
-export const refSymbol = Symbol(__DEV__ ? 'refSymbol' : undefined)
+export const refSymbol = Symbol(__DEV__ ? 'refSymbol' : '')
 
 export interface Ref<T = any> {
   [refSymbol]: true
-- 
2.47.3