From 520af9787b54955e2ae883679d241f2013271df8 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Mon, 21 Oct 2019 12:24:19 -0400
Subject: [PATCH] perf: skip normalizeVNode in optimized mode

---
 packages/runtime-core/src/createRenderer.ts | 45 +++++++++++++++------
 1 file changed, 32 insertions(+), 13 deletions(-)

diff --git a/packages/runtime-core/src/createRenderer.ts b/packages/runtime-core/src/createRenderer.ts
index 9d2fc51e..f2bc0715 100644
--- a/packages/runtime-core/src/createRenderer.ts
+++ b/packages/runtime-core/src/createRenderer.ts
@@ -319,7 +319,8 @@ export function createRenderer<
         anchor,
         parentComponent,
         parentSuspense,
-        isSVG
+        isSVG,
+        optimized
       )
     } else {
       patchElement(n1, n2, parentComponent, parentSuspense, isSVG, optimized)
@@ -335,7 +336,8 @@ export function createRenderer<
     anchor: HostNode | null,
     parentComponent: ComponentInternalInstance | null,
     parentSuspense: HostSuspenseBoundary | null,
-    isSVG: boolean
+    isSVG: boolean,
+    optimized: boolean
   ) {
     const tag = vnode.type as string
     isSVG = isSVG || tag === 'svg'
@@ -359,7 +361,8 @@ export function createRenderer<
         null,
         parentComponent,
         parentSuspense,
-        isSVG
+        isSVG,
+        optimized || vnode.dynamicChildren !== null
       )
     }
     hostInsert(el, container, anchor)
@@ -377,10 +380,13 @@ export function createRenderer<
     parentComponent: ComponentInternalInstance | null,
     parentSuspense: HostSuspenseBoundary | null,
     isSVG: boolean,
+    optimized: boolean,
     start: number = 0
   ) {
     for (let i = start; i < children.length; i++) {
-      const child = (children[i] = normalizeVNode(children[i]))
+      const child = optimized
+        ? (children[i] as HostVNode)
+        : (children[i] = normalizeVNode(children[i]))
       patch(
         null,
         child,
@@ -388,7 +394,8 @@ export function createRenderer<
         anchor,
         parentComponent,
         parentSuspense,
-        isSVG
+        isSVG,
+        optimized
       )
     }
   }
@@ -620,7 +627,8 @@ export function createRenderer<
         fragmentEndAnchor,
         parentComponent,
         parentSuspense,
-        isSVG
+        isSVG,
+        optimized
       )
     } else {
       patchChildren(
@@ -662,7 +670,8 @@ export function createRenderer<
             null,
             parentComponent,
             parentSuspense,
-            isSVG
+            isSVG,
+            optimized
           )
         }
       } else if (__DEV__) {
@@ -1337,7 +1346,8 @@ export function createRenderer<
             anchor,
             parentComponent,
             parentSuspense,
-            isSVG
+            isSVG,
+            optimized
           )
         }
       }
@@ -1361,7 +1371,9 @@ export function createRenderer<
     const commonLength = Math.min(oldLength, newLength)
     let i
     for (i = 0; i < commonLength; i++) {
-      const nextChild = (c2[i] = normalizeVNode(c2[i]))
+      const nextChild = optimized
+        ? (c2[i] as HostVNode)
+        : (c2[i] = normalizeVNode(c2[i]))
       patch(
         c1[i],
         nextChild,
@@ -1385,6 +1397,7 @@ export function createRenderer<
         parentComponent,
         parentSuspense,
         isSVG,
+        optimized,
         commonLength
       )
     }
@@ -1411,7 +1424,9 @@ export function createRenderer<
     // (a b) d e
     while (i <= e1 && i <= e2) {
       const n1 = c1[i]
-      const n2 = (c2[i] = normalizeVNode(c2[i]))
+      const n2 = optimized
+        ? (c2[i] as HostVNode)
+        : (c2[i] = normalizeVNode(c2[i]))
       if (isSameType(n1, n2)) {
         patch(
           n1,
@@ -1434,7 +1449,9 @@ export function createRenderer<
     // d e (b c)
     while (i <= e1 && i <= e2) {
       const n1 = c1[e1]
-      const n2 = (c2[e2] = normalizeVNode(c2[e2]))
+      const n2 = optimized
+        ? (c2[i] as HostVNode)
+        : (c2[e2] = normalizeVNode(c2[e2]))
       if (isSameType(n1, n2)) {
         patch(
           n1,
@@ -1468,7 +1485,7 @@ export function createRenderer<
         while (i <= e2) {
           patch(
             null,
-            (c2[i] = normalizeVNode(c2[i])),
+            optimized ? (c2[i] as HostVNode) : (c2[i] = normalizeVNode(c2[i])),
             container,
             anchor,
             parentComponent,
@@ -1505,7 +1522,9 @@ export function createRenderer<
       // 5.1 build key:index map for newChildren
       const keyToNewIndexMap: Map<string | number, number> = new Map()
       for (i = s2; i <= e2; i++) {
-        const nextChild = (c2[i] = normalizeVNode(c2[i]))
+        const nextChild = optimized
+          ? (c2[i] as HostVNode)
+          : (c2[i] = normalizeVNode(c2[i]))
         if (nextChild.key != null) {
           if (__DEV__ && keyToNewIndexMap.has(nextChild.key)) {
             warn(