From 1a7daecdbc69a33b599ae510fe9db14dbc441c4f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=B0=A2=E4=BF=8A?= <xiejun_ncu@qq.com>
Date: Mon, 8 Apr 2019 17:18:36 +0800
Subject: [PATCH] Update deep-assign.ts (#3103)

---
 packages/utils/deep-assign.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/utils/deep-assign.ts b/packages/utils/deep-assign.ts
index eaff80cde..2b93b1c9e 100644
--- a/packages/utils/deep-assign.ts
+++ b/packages/utils/deep-assign.ts
@@ -10,7 +10,7 @@ type Object = {
 function assignKey(to: Object, from: Object, key: string) {
   const val = from[key];
 
-  if (!isDef(val) || (hasOwnProperty.call(to, key) && !isDef(to[key]))) {
+  if (!isDef(val)) {
     return;
   }