From 499bc0bfc4aedcb6ee4ec55ba823838b5496eba8 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Mon, 24 Aug 2020 18:13:17 -0400
Subject: [PATCH] fix(hmr): properly force hmr full component props update

fix #1942
---
 packages/runtime-core/src/componentProps.ts | 7 ++++++-
 packages/runtime-core/src/renderer.ts       | 3 ---
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/packages/runtime-core/src/componentProps.ts b/packages/runtime-core/src/componentProps.ts
index 90abf4149f0..28d7de2a5e7 100644
--- a/packages/runtime-core/src/componentProps.ts
+++ b/packages/runtime-core/src/componentProps.ts
@@ -153,7 +153,12 @@ export function updateProps(
   const rawCurrentProps = toRaw(props)
   const [options] = normalizePropsOptions(instance.type)
 
-  if ((optimized || patchFlag > 0) && !(patchFlag & PatchFlags.FULL_PROPS)) {
+  if (
+    // always force full diff if hmr is enabled
+    !(__DEV__ && instance.type.__hmrId) &&
+    (optimized || patchFlag > 0) &&
+    !(patchFlag & PatchFlags.FULL_PROPS)
+  ) {
     if (patchFlag & PatchFlags.PROPS) {
       // Compiler-generated props & no keys change, just set the updated
       // the props.
diff --git a/packages/runtime-core/src/renderer.ts b/packages/runtime-core/src/renderer.ts
index f35435a1c69..930464ebc61 100644
--- a/packages/runtime-core/src/renderer.ts
+++ b/packages/runtime-core/src/renderer.ts
@@ -1451,9 +1451,6 @@ function baseCreateRenderer(
     nextVNode: VNode,
     optimized: boolean
   ) => {
-    if (__DEV__ && instance.type.__hmrId) {
-      optimized = false
-    }
     nextVNode.component = instance
     const prevProps = instance.vnode.props
     instance.vnode = nextVNode