From 4f17be7b1ce4872ded085a36b95c1897d8c1f299 Mon Sep 17 00:00:00 2001
From: HcySunYang <HcySunYang@outlook.com>
Date: Tue, 18 May 2021 02:07:53 +0800
Subject: [PATCH] fix(compat): avoid accidentally delete the modelValue prop
 (#3772)

---
 packages/runtime-core/src/compat/componentVModel.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/runtime-core/src/compat/componentVModel.ts b/packages/runtime-core/src/compat/componentVModel.ts
index 03ae787afb9..e179c3b1d41 100644
--- a/packages/runtime-core/src/compat/componentVModel.ts
+++ b/packages/runtime-core/src/compat/componentVModel.ts
@@ -39,8 +39,10 @@ export function convertLegacyVModelProps(vnode: VNode) {
     // modelValue -> value
     // onUpdate:modelValue -> onModelCompat:input
     const { prop = 'value', event = 'input' } = (type as any).model || {}
-    props[prop] = props.modelValue
-    delete props.modelValue
+    if (prop !== 'modelValue') {
+      props[prop] = props.modelValue
+      delete props.modelValue
+    }
     // important: update dynamic props
     if (dynamicProps) {
       dynamicProps[dynamicProps.indexOf('modelValue')] = prop