improve mergeVNodeHook logic

src/core/vdom/helpers.js

@@ -65,19 +65,19 @@ export function getFirstComponentChild (children: ?Array<any>) {
   return children && children.filter(c => c && c.componentOptions)[0]
 }
 
-export function mergeVNodeHook (def: Object, key: string, hook: Function) {
+export function mergeVNodeHook (def: Object, hookKey: string, hook: Function, key: string) {
-  const oldHook = def[key]
+  key = key + hookKey
+  const injectedHash = def.__injected || (def.__injected = {})
+  if (injectedHash[key]) return
+  injectedHash[key] = true
+  const oldHook = def[hookKey]
   if (oldHook) {
-    const injectedHash = def.__injected || (def.__injected = {})
+    def[hookKey] = function () {
-    if (!injectedHash[key]) {
+      oldHook.apply(this, arguments)
-      injectedHash[key] = true
+      hook.apply(this, arguments)
-      def[key] = function () {
-        oldHook.apply(this, arguments)
-        hook.apply(this, arguments)
-      }
     }
   } else {
-    def[key] = hook
+    def[hookKey] = hook
   }
 }
 

src/core/vdom/modules/directives.js

@@ -15,7 +15,7 @@ export default {
     if (hasInsert) {
       mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'insert', () => {
         applyDirectives(oldVnode, vnode, 'inserted')
-      })
+      }, 'dir-insert')
     }
   },
   update: function updateDirectives (oldVnode: VNodeWithData, vnode: VNodeWithData) {

src/platforms/web/runtime/components/transition.js

@@ -119,7 +119,7 @@ export default {
       return placeholder(h, rawChild)
     }
 
-    child.key = child.key == null || child.isStatic
+    const key = child.key = child.key == null || child.isStatic
       ? `__v${child.tag + this._uid}__`
       : child.key
     const data = (child.data || (child.data = {})).transition = extractTransitionData(this)
@@ -132,7 +132,7 @@ export default {
       child.data.show = true
     }
 
-    if (oldChild && oldChild.data && oldChild.key !== child.key) {
+    if (oldChild && oldChild.data && oldChild.key !== key) {
       // replace old child transition data with fresh one
       // important for dynamic transitions!
       const oldData = oldChild.data.transition = extend({}, data)
@@ -144,16 +144,16 @@ export default {
         mergeVNodeHook(oldData, 'afterLeave', () => {
           this._leaving = false
           this.$forceUpdate()
-        })
+        }, key)
         return placeholder(h, rawChild)
       } else if (mode === 'in-out') {
         var delayedLeave
         var performLeave = () => { delayedLeave() }
-        mergeVNodeHook(data, 'afterEnter', performLeave)
+        mergeVNodeHook(data, 'afterEnter', performLeave, key)
-        mergeVNodeHook(data, 'enterCancelled', performLeave)
+        mergeVNodeHook(data, 'enterCancelled', performLeave, key)
         mergeVNodeHook(oldData, 'delayLeave', leave => {
           delayedLeave = leave
-        })
+        }, key)
       }
     }
 

src/platforms/web/runtime/modules/transition.js

@@ -100,7 +100,7 @@ export function enter (vnode: VNodeWithData) {
         pendingNode.elm._leaveCb()
       }
       enterHook && enterHook(el, cb)
-    })
+    }, 'transition-insert')
   }
 
   // start enter transition