From 26105034da4fcce7ac883c899d781f016559310d Mon Sep 17 00:00:00 2001
From: ruki <waruqi@gmail.com>
Date: Thu, 8 Nov 2018 00:38:48 +0800
Subject: switch to vuepress

---
 node_modules/vue/src/core/vdom/create-component.js | 257 +++++++
 node_modules/vue/src/core/vdom/create-element.js   | 160 +++++
 .../src/core/vdom/create-functional-component.js   | 136 ++++
 .../vue/src/core/vdom/helpers/extract-props.js     |  75 ++
 .../core/vdom/helpers/get-first-component-child.js |  15 +
 node_modules/vue/src/core/vdom/helpers/index.js    |   9 +
 .../src/core/vdom/helpers/is-async-placeholder.js  |   5 +
 .../vue/src/core/vdom/helpers/merge-hook.js        |  38 +
 .../src/core/vdom/helpers/normalize-children.js    |  89 +++
 .../core/vdom/helpers/resolve-async-component.js   | 140 ++++
 .../vue/src/core/vdom/helpers/update-listeners.js  |  83 +++
 .../vue/src/core/vdom/modules/directives.js        | 119 ++++
 node_modules/vue/src/core/vdom/modules/index.js    |   7 +
 node_modules/vue/src/core/vdom/modules/ref.js      |  45 ++
 node_modules/vue/src/core/vdom/patch.js            | 787 +++++++++++++++++++++
 node_modules/vue/src/core/vdom/vnode.js            | 108 +++
 16 files changed, 2073 insertions(+)
 create mode 100644 node_modules/vue/src/core/vdom/create-component.js
 create mode 100644 node_modules/vue/src/core/vdom/create-element.js
 create mode 100644 node_modules/vue/src/core/vdom/create-functional-component.js
 create mode 100644 node_modules/vue/src/core/vdom/helpers/extract-props.js
 create mode 100644 node_modules/vue/src/core/vdom/helpers/get-first-component-child.js
 create mode 100644 node_modules/vue/src/core/vdom/helpers/index.js
 create mode 100644 node_modules/vue/src/core/vdom/helpers/is-async-placeholder.js
 create mode 100644 node_modules/vue/src/core/vdom/helpers/merge-hook.js
 create mode 100644 node_modules/vue/src/core/vdom/helpers/normalize-children.js
 create mode 100644 node_modules/vue/src/core/vdom/helpers/resolve-async-component.js
 create mode 100644 node_modules/vue/src/core/vdom/helpers/update-listeners.js
 create mode 100644 node_modules/vue/src/core/vdom/modules/directives.js
 create mode 100644 node_modules/vue/src/core/vdom/modules/index.js
 create mode 100644 node_modules/vue/src/core/vdom/modules/ref.js
 create mode 100644 node_modules/vue/src/core/vdom/patch.js
 create mode 100644 node_modules/vue/src/core/vdom/vnode.js

(limited to 'node_modules/vue/src/core/vdom')

diff --git a/node_modules/vue/src/core/vdom/create-component.js b/node_modules/vue/src/core/vdom/create-component.js
new file mode 100644
index 00000000..89578224
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/create-component.js
@@ -0,0 +1,257 @@
+/* @flow */
+
+import VNode from './vnode'
+import { resolveConstructorOptions } from 'core/instance/init'
+import { queueActivatedComponent } from 'core/observer/scheduler'
+import { createFunctionalComponent } from './create-functional-component'
+
+import {
+  warn,
+  isDef,
+  isUndef,
+  isTrue,
+  isObject
+} from '../util/index'
+
+import {
+  resolveAsyncComponent,
+  createAsyncPlaceholder,
+  extractPropsFromVNodeData
+} from './helpers/index'
+
+import {
+  callHook,
+  activeInstance,
+  updateChildComponent,
+  activateChildComponent,
+  deactivateChildComponent
+} from '../instance/lifecycle'
+
+import {
+  isRecyclableComponent,
+  renderRecyclableComponentTemplate
+} from 'weex/runtime/recycle-list/render-component-template'
+
+// inline hooks to be invoked on component VNodes during patch
+const componentVNodeHooks = {
+  init (
+    vnode: VNodeWithData,
+    hydrating: boolean,
+    parentElm: ?Node,
+    refElm: ?Node
+  ): ?boolean {
+    if (
+      vnode.componentInstance &&
+      !vnode.componentInstance._isDestroyed &&
+      vnode.data.keepAlive
+    ) {
+      // kept-alive components, treat as a patch
+      const mountedNode: any = vnode // work around flow
+      componentVNodeHooks.prepatch(mountedNode, mountedNode)
+    } else {
+      const child = vnode.componentInstance = createComponentInstanceForVnode(
+        vnode,
+        activeInstance,
+        parentElm,
+        refElm
+      )
+      child.$mount(hydrating ? vnode.elm : undefined, hydrating)
+    }
+  },
+
+  prepatch (oldVnode: MountedComponentVNode, vnode: MountedComponentVNode) {
+    const options = vnode.componentOptions
+    const child = vnode.componentInstance = oldVnode.componentInstance
+    updateChildComponent(
+      child,
+      options.propsData, // updated props
+      options.listeners, // updated listeners
+      vnode, // new parent vnode
+      options.children // new children
+    )
+  },
+
+  insert (vnode: MountedComponentVNode) {
+    const { context, componentInstance } = vnode
+    if (!componentInstance._isMounted) {
+      componentInstance._isMounted = true
+      callHook(componentInstance, 'mounted')
+    }
+    if (vnode.data.keepAlive) {
+      if (context._isMounted) {
+        // vue-router#1212
+        // During updates, a kept-alive component's child components may
+        // change, so directly walking the tree here may call activated hooks
+        // on incorrect children. Instead we push them into a queue which will
+        // be processed after the whole patch process ended.
+        queueActivatedComponent(componentInstance)
+      } else {
+        activateChildComponent(componentInstance, true /* direct */)
+      }
+    }
+  },
+
+  destroy (vnode: MountedComponentVNode) {
+    const { componentInstance } = vnode
+    if (!componentInstance._isDestroyed) {
+      if (!vnode.data.keepAlive) {
+        componentInstance.$destroy()
+      } else {
+        deactivateChildComponent(componentInstance, true /* direct */)
+      }
+    }
+  }
+}
+
+const hooksToMerge = Object.keys(componentVNodeHooks)
+
+export function createComponent (
+  Ctor: Class<Component> | Function | Object | void,
+  data: ?VNodeData,
+  context: Component,
+  children: ?Array<VNode>,
+  tag?: string
+): VNode | Array<VNode> | void {
+  if (isUndef(Ctor)) {
+    return
+  }
+
+  const baseCtor = context.$options._base
+
+  // plain options object: turn it into a constructor
+  if (isObject(Ctor)) {
+    Ctor = baseCtor.extend(Ctor)
+  }
+
+  // if at this stage it's not a constructor or an async component factory,
+  // reject.
+  if (typeof Ctor !== 'function') {
+    if (process.env.NODE_ENV !== 'production') {
+      warn(`Invalid Component definition: ${String(Ctor)}`, context)
+    }
+    return
+  }
+
+  // async component
+  let asyncFactory
+  if (isUndef(Ctor.cid)) {
+    asyncFactory = Ctor
+    Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context)
+    if (Ctor === undefined) {
+      // return a placeholder node for async component, which is rendered
+      // as a comment node but preserves all the raw information for the node.
+      // the information will be used for async server-rendering and hydration.
+      return createAsyncPlaceholder(
+        asyncFactory,
+        data,
+        context,
+        children,
+        tag
+      )
+    }
+  }
+
+  data = data || {}
+
+  // resolve constructor options in case global mixins are applied after
+  // component constructor creation
+  resolveConstructorOptions(Ctor)
+
+  // transform component v-model data into props & events
+  if (isDef(data.model)) {
+    transformModel(Ctor.options, data)
+  }
+
+  // extract props
+  const propsData = extractPropsFromVNodeData(data, Ctor, tag)
+
+  // functional component
+  if (isTrue(Ctor.options.functional)) {
+    return createFunctionalComponent(Ctor, propsData, data, context, children)
+  }
+
+  // extract listeners, since these needs to be treated as
+  // child component listeners instead of DOM listeners
+  const listeners = data.on
+  // replace with listeners with .native modifier
+  // so it gets processed during parent component patch.
+  data.on = data.nativeOn
+
+  if (isTrue(Ctor.options.abstract)) {
+    // abstract components do not keep anything
+    // other than props & listeners & slot
+
+    // work around flow
+    const slot = data.slot
+    data = {}
+    if (slot) {
+      data.slot = slot
+    }
+  }
+
+  // install component management hooks onto the placeholder node
+  installComponentHooks(data)
+
+  // return a placeholder vnode
+  const name = Ctor.options.name || tag
+  const vnode = new VNode(
+    `vue-component-${Ctor.cid}${name ? `-${name}` : ''}`,
+    data, undefined, undefined, undefined, context,
+    { Ctor, propsData, listeners, tag, children },
+    asyncFactory
+  )
+
+  // Weex specific: invoke recycle-list optimized @render function for
+  // extracting cell-slot template.
+  // https://github.com/Hanks10100/weex-native-directive/tree/master/component
+  /* istanbul ignore if */
+  if (__WEEX__ && isRecyclableComponent(vnode)) {
+    return renderRecyclableComponentTemplate(vnode)
+  }
+
+  return vnode
+}
+
+export function createComponentInstanceForVnode (
+  vnode: any, // we know it's MountedComponentVNode but flow doesn't
+  parent: any, // activeInstance in lifecycle state
+  parentElm?: ?Node,
+  refElm?: ?Node
+): Component {
+  const options: InternalComponentOptions = {
+    _isComponent: true,
+    parent,
+    _parentVnode: vnode,
+    _parentElm: parentElm || null,
+    _refElm: refElm || null
+  }
+  // check inline-template render functions
+  const inlineTemplate = vnode.data.inlineTemplate
+  if (isDef(inlineTemplate)) {
+    options.render = inlineTemplate.render
+    options.staticRenderFns = inlineTemplate.staticRenderFns
+  }
+  return new vnode.componentOptions.Ctor(options)
+}
+
+function installComponentHooks (data: VNodeData) {
+  const hooks = data.hook || (data.hook = {})
+  for (let i = 0; i < hooksToMerge.length; i++) {
+    const key = hooksToMerge[i]
+    hooks[key] = componentVNodeHooks[key]
+  }
+}
+
+// transform component v-model info (value and callback) into
+// prop and event handler respectively.
+function transformModel (options, data: any) {
+  const prop = (options.model && options.model.prop) || 'value'
+  const event = (options.model && options.model.event) || 'input'
+  ;(data.props || (data.props = {}))[prop] = data.model.value
+  const on = data.on || (data.on = {})
+  if (isDef(on[event])) {
+    on[event] = [data.model.callback].concat(on[event])
+  } else {
+    on[event] = data.model.callback
+  }
+}
diff --git a/node_modules/vue/src/core/vdom/create-element.js b/node_modules/vue/src/core/vdom/create-element.js
new file mode 100644
index 00000000..c5cde2c6
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/create-element.js
@@ -0,0 +1,160 @@
+/* @flow */
+
+import config from '../config'
+import VNode, { createEmptyVNode } from './vnode'
+import { createComponent } from './create-component'
+import { traverse } from '../observer/traverse'
+
+import {
+  warn,
+  isDef,
+  isUndef,
+  isTrue,
+  isObject,
+  isPrimitive,
+  resolveAsset
+} from '../util/index'
+
+import {
+  normalizeChildren,
+  simpleNormalizeChildren
+} from './helpers/index'
+
+const SIMPLE_NORMALIZE = 1
+const ALWAYS_NORMALIZE = 2
+
+// wrapper function for providing a more flexible interface
+// without getting yelled at by flow
+export function createElement (
+  context: Component,
+  tag: any,
+  data: any,
+  children: any,
+  normalizationType: any,
+  alwaysNormalize: boolean
+): VNode | Array<VNode> {
+  if (Array.isArray(data) || isPrimitive(data)) {
+    normalizationType = children
+    children = data
+    data = undefined
+  }
+  if (isTrue(alwaysNormalize)) {
+    normalizationType = ALWAYS_NORMALIZE
+  }
+  return _createElement(context, tag, data, children, normalizationType)
+}
+
+export function _createElement (
+  context: Component,
+  tag?: string | Class<Component> | Function | Object,
+  data?: VNodeData,
+  children?: any,
+  normalizationType?: number
+): VNode | Array<VNode> {
+  if (isDef(data) && isDef((data: any).__ob__)) {
+    process.env.NODE_ENV !== 'production' && warn(
+      `Avoid using observed data object as vnode data: ${JSON.stringify(data)}\n` +
+      'Always create fresh vnode data objects in each render!',
+      context
+    )
+    return createEmptyVNode()
+  }
+  // object syntax in v-bind
+  if (isDef(data) && isDef(data.is)) {
+    tag = data.is
+  }
+  if (!tag) {
+    // in case of component :is set to falsy value
+    return createEmptyVNode()
+  }
+  // warn against non-primitive key
+  if (process.env.NODE_ENV !== 'production' &&
+    isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+  ) {
+    if (!__WEEX__ || !('@binding' in data.key)) {
+      warn(
+        'Avoid using non-primitive value as key, ' +
+        'use string/number value instead.',
+        context
+      )
+    }
+  }
+  // support single function children as default scoped slot
+  if (Array.isArray(children) &&
+    typeof children[0] === 'function'
+  ) {
+    data = data || {}
+    data.scopedSlots = { default: children[0] }
+    children.length = 0
+  }
+  if (normalizationType === ALWAYS_NORMALIZE) {
+    children = normalizeChildren(children)
+  } else if (normalizationType === SIMPLE_NORMALIZE) {
+    children = simpleNormalizeChildren(children)
+  }
+  let vnode, ns
+  if (typeof tag === 'string') {
+    let Ctor
+    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag)
+    if (config.isReservedTag(tag)) {
+      // platform built-in elements
+      vnode = new VNode(
+        config.parsePlatformTagName(tag), data, children,
+        undefined, undefined, context
+      )
+    } else if (isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+      // component
+      vnode = createComponent(Ctor, data, context, children, tag)
+    } else {
+      // unknown or unlisted namespaced elements
+      // check at runtime because it may get assigned a namespace when its
+      // parent normalizes children
+      vnode = new VNode(
+        tag, data, children,
+        undefined, undefined, context
+      )
+    }
+  } else {
+    // direct component options / constructor
+    vnode = createComponent(tag, data, context, children)
+  }
+  if (Array.isArray(vnode)) {
+    return vnode
+  } else if (isDef(vnode)) {
+    if (isDef(ns)) applyNS(vnode, ns)
+    if (isDef(data)) registerDeepBindings(data)
+    return vnode
+  } else {
+    return createEmptyVNode()
+  }
+}
+
+function applyNS (vnode, ns, force) {
+  vnode.ns = ns
+  if (vnode.tag === 'foreignObject') {
+    // use default namespace inside foreignObject
+    ns = undefined
+    force = true
+  }
+  if (isDef(vnode.children)) {
+    for (let i = 0, l = vnode.children.length; i < l; i++) {
+      const child = vnode.children[i]
+      if (isDef(child.tag) && (
+        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+        applyNS(child, ns, force)
+      }
+    }
+  }
+}
+
+// ref #5318
+// necessary to ensure parent re-render when deep bindings like :style and
+// :class are used on slot nodes
+function registerDeepBindings (data) {
+  if (isObject(data.style)) {
+    traverse(data.style)
+  }
+  if (isObject(data.class)) {
+    traverse(data.class)
+  }
+}
diff --git a/node_modules/vue/src/core/vdom/create-functional-component.js b/node_modules/vue/src/core/vdom/create-functional-component.js
new file mode 100644
index 00000000..efed801d
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/create-functional-component.js
@@ -0,0 +1,136 @@
+/* @flow */
+
+import VNode, { cloneVNode } from './vnode'
+import { createElement } from './create-element'
+import { resolveInject } from '../instance/inject'
+import { normalizeChildren } from '../vdom/helpers/normalize-children'
+import { resolveSlots } from '../instance/render-helpers/resolve-slots'
+import { installRenderHelpers } from '../instance/render-helpers/index'
+
+import {
+  isDef,
+  isTrue,
+  hasOwn,
+  camelize,
+  emptyObject,
+  validateProp
+} from '../util/index'
+
+export function FunctionalRenderContext (
+  data: VNodeData,
+  props: Object,
+  children: ?Array<VNode>,
+  parent: Component,
+  Ctor: Class<Component>
+) {
+  const options = Ctor.options
+  // ensure the createElement function in functional components
+  // gets a unique context - this is necessary for correct named slot check
+  let contextVm
+  if (hasOwn(parent, '_uid')) {
+    contextVm = Object.create(parent)
+    // $flow-disable-line
+    contextVm._original = parent
+  } else {
+    // the context vm passed in is a functional context as well.
+    // in this case we want to make sure we are able to get a hold to the
+    // real context instance.
+    contextVm = parent
+    // $flow-disable-line
+    parent = parent._original
+  }
+  const isCompiled = isTrue(options._compiled)
+  const needNormalization = !isCompiled
+
+  this.data = data
+  this.props = props
+  this.children = children
+  this.parent = parent
+  this.listeners = data.on || emptyObject
+  this.injections = resolveInject(options.inject, parent)
+  this.slots = () => resolveSlots(children, parent)
+
+  // support for compiled functional template
+  if (isCompiled) {
+    // exposing $options for renderStatic()
+    this.$options = options
+    // pre-resolve slots for renderSlot()
+    this.$slots = this.slots()
+    this.$scopedSlots = data.scopedSlots || emptyObject
+  }
+
+  if (options._scopeId) {
+    this._c = (a, b, c, d) => {
+      const vnode = createElement(contextVm, a, b, c, d, needNormalization)
+      if (vnode && !Array.isArray(vnode)) {
+        vnode.fnScopeId = options._scopeId
+        vnode.fnContext = parent
+      }
+      return vnode
+    }
+  } else {
+    this._c = (a, b, c, d) => createElement(contextVm, a, b, c, d, needNormalization)
+  }
+}
+
+installRenderHelpers(FunctionalRenderContext.prototype)
+
+export function createFunctionalComponent (
+  Ctor: Class<Component>,
+  propsData: ?Object,
+  data: VNodeData,
+  contextVm: Component,
+  children: ?Array<VNode>
+): VNode | Array<VNode> | void {
+  const options = Ctor.options
+  const props = {}
+  const propOptions = options.props
+  if (isDef(propOptions)) {
+    for (const key in propOptions) {
+      props[key] = validateProp(key, propOptions, propsData || emptyObject)
+    }
+  } else {
+    if (isDef(data.attrs)) mergeProps(props, data.attrs)
+    if (isDef(data.props)) mergeProps(props, data.props)
+  }
+
+  const renderContext = new FunctionalRenderContext(
+    data,
+    props,
+    children,
+    contextVm,
+    Ctor
+  )
+
+  const vnode = options.render.call(null, renderContext._c, renderContext)
+
+  if (vnode instanceof VNode) {
+    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options)
+  } else if (Array.isArray(vnode)) {
+    const vnodes = normalizeChildren(vnode) || []
+    const res = new Array(vnodes.length)
+    for (let i = 0; i < vnodes.length; i++) {
+      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options)
+    }
+    return res
+  }
+}
+
+function cloneAndMarkFunctionalResult (vnode, data, contextVm, options) {
+  // #7817 clone node before setting fnContext, otherwise if the node is reused
+  // (e.g. it was from a cached normal slot) the fnContext causes named slots
+  // that should not be matched to match.
+  const clone = cloneVNode(vnode)
+  clone.fnContext = contextVm
+  clone.fnOptions = options
+  if (data.slot) {
+    (clone.data || (clone.data = {})).slot = data.slot
+  }
+  return clone
+}
+
+function mergeProps (to, from) {
+  for (const key in from) {
+    to[camelize(key)] = from[key]
+  }
+}
diff --git a/node_modules/vue/src/core/vdom/helpers/extract-props.js b/node_modules/vue/src/core/vdom/helpers/extract-props.js
new file mode 100644
index 00000000..f2a41661
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/helpers/extract-props.js
@@ -0,0 +1,75 @@
+/* @flow */
+
+import {
+  tip,
+  hasOwn,
+  isDef,
+  isUndef,
+  hyphenate,
+  formatComponentName
+} from 'core/util/index'
+
+export function extractPropsFromVNodeData (
+  data: VNodeData,
+  Ctor: Class<Component>,
+  tag?: string
+): ?Object {
+  // we are only extracting raw values here.
+  // validation and default values are handled in the child
+  // component itself.
+  const propOptions = Ctor.options.props
+  if (isUndef(propOptions)) {
+    return
+  }
+  const res = {}
+  const { attrs, props } = data
+  if (isDef(attrs) || isDef(props)) {
+    for (const key in propOptions) {
+      const altKey = hyphenate(key)
+      if (process.env.NODE_ENV !== 'production') {
+        const keyInLowerCase = key.toLowerCase()
+        if (
+          key !== keyInLowerCase &&
+          attrs && hasOwn(attrs, keyInLowerCase)
+        ) {
+          tip(
+            `Prop "${keyInLowerCase}" is passed to component ` +
+            `${formatComponentName(tag || Ctor)}, but the declared prop name is` +
+            ` "${key}". ` +
+            `Note that HTML attributes are case-insensitive and camelCased ` +
+            `props need to use their kebab-case equivalents when using in-DOM ` +
+            `templates. You should probably use "${altKey}" instead of "${key}".`
+          )
+        }
+      }
+      checkProp(res, props, key, altKey, true) ||
+      checkProp(res, attrs, key, altKey, false)
+    }
+  }
+  return res
+}
+
+function checkProp (
+  res: Object,
+  hash: ?Object,
+  key: string,
+  altKey: string,
+  preserve: boolean
+): boolean {
+  if (isDef(hash)) {
+    if (hasOwn(hash, key)) {
+      res[key] = hash[key]
+      if (!preserve) {
+        delete hash[key]
+      }
+      return true
+    } else if (hasOwn(hash, altKey)) {
+      res[key] = hash[altKey]
+      if (!preserve) {
+        delete hash[altKey]
+      }
+      return true
+    }
+  }
+  return false
+}
diff --git a/node_modules/vue/src/core/vdom/helpers/get-first-component-child.js b/node_modules/vue/src/core/vdom/helpers/get-first-component-child.js
new file mode 100644
index 00000000..f8649dd8
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/helpers/get-first-component-child.js
@@ -0,0 +1,15 @@
+/* @flow */
+
+import { isDef } from 'shared/util'
+import { isAsyncPlaceholder } from './is-async-placeholder'
+
+export function getFirstComponentChild (children: ?Array<VNode>): ?VNode {
+  if (Array.isArray(children)) {
+    for (let i = 0; i < children.length; i++) {
+      const c = children[i]
+      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
+        return c
+      }
+    }
+  }
+}
diff --git a/node_modules/vue/src/core/vdom/helpers/index.js b/node_modules/vue/src/core/vdom/helpers/index.js
new file mode 100644
index 00000000..320cf4c4
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/helpers/index.js
@@ -0,0 +1,9 @@
+/* @flow */
+
+export * from './merge-hook'
+export * from './extract-props'
+export * from './update-listeners'
+export * from './normalize-children'
+export * from './resolve-async-component'
+export * from './get-first-component-child'
+export * from './is-async-placeholder'
diff --git a/node_modules/vue/src/core/vdom/helpers/is-async-placeholder.js b/node_modules/vue/src/core/vdom/helpers/is-async-placeholder.js
new file mode 100644
index 00000000..6c4a6596
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/helpers/is-async-placeholder.js
@@ -0,0 +1,5 @@
+/* @flow */
+
+export function isAsyncPlaceholder (node: VNode): boolean {
+  return node.isComment && node.asyncFactory
+}
diff --git a/node_modules/vue/src/core/vdom/helpers/merge-hook.js b/node_modules/vue/src/core/vdom/helpers/merge-hook.js
new file mode 100644
index 00000000..0bb96e8b
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/helpers/merge-hook.js
@@ -0,0 +1,38 @@
+/* @flow */
+
+import VNode from '../vnode'
+import { createFnInvoker } from './update-listeners'
+import { remove, isDef, isUndef, isTrue } from 'shared/util'
+
+export function mergeVNodeHook (def: Object, hookKey: string, hook: Function) {
+  if (def instanceof VNode) {
+    def = def.data.hook || (def.data.hook = {})
+  }
+  let invoker
+  const oldHook = def[hookKey]
+
+  function wrappedHook () {
+    hook.apply(this, arguments)
+    // important: remove merged hook to ensure it's called only once
+    // and prevent memory leak
+    remove(invoker.fns, wrappedHook)
+  }
+
+  if (isUndef(oldHook)) {
+    // no existing hook
+    invoker = createFnInvoker([wrappedHook])
+  } else {
+    /* istanbul ignore if */
+    if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
+      // already a merged invoker
+      invoker = oldHook
+      invoker.fns.push(wrappedHook)
+    } else {
+      // existing plain hook
+      invoker = createFnInvoker([oldHook, wrappedHook])
+    }
+  }
+
+  invoker.merged = true
+  def[hookKey] = invoker
+}
diff --git a/node_modules/vue/src/core/vdom/helpers/normalize-children.js b/node_modules/vue/src/core/vdom/helpers/normalize-children.js
new file mode 100644
index 00000000..a4622ef4
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/helpers/normalize-children.js
@@ -0,0 +1,89 @@
+/* @flow */
+
+import VNode, { createTextVNode } from 'core/vdom/vnode'
+import { isFalse, isTrue, isDef, isUndef, isPrimitive } from 'shared/util'
+
+// The template compiler attempts to minimize the need for normalization by
+// statically analyzing the template at compile time.
+//
+// For plain HTML markup, normalization can be completely skipped because the
+// generated render function is guaranteed to return Array<VNode>. There are
+// two cases where extra normalization is needed:
+
+// 1. When the children contains components - because a functional component
+// may return an Array instead of a single root. In this case, just a simple
+// normalization is needed - if any child is an Array, we flatten the whole
+// thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
+// because functional components already normalize their own children.
+export function simpleNormalizeChildren (children: any) {
+  for (let i = 0; i < children.length; i++) {
+    if (Array.isArray(children[i])) {
+      return Array.prototype.concat.apply([], children)
+    }
+  }
+  return children
+}
+
+// 2. When the children contains constructs that always generated nested Arrays,
+// e.g. <template>, <slot>, v-for, or when the children is provided by user
+// with hand-written render functions / JSX. In such cases a full normalization
+// is needed to cater to all possible types of children values.
+export function normalizeChildren (children: any): ?Array<VNode> {
+  return isPrimitive(children)
+    ? [createTextVNode(children)]
+    : Array.isArray(children)
+      ? normalizeArrayChildren(children)
+      : undefined
+}
+
+function isTextNode (node): boolean {
+  return isDef(node) && isDef(node.text) && isFalse(node.isComment)
+}
+
+function normalizeArrayChildren (children: any, nestedIndex?: string): Array<VNode> {
+  const res = []
+  let i, c, lastIndex, last
+  for (i = 0; i < children.length; i++) {
+    c = children[i]
+    if (isUndef(c) || typeof c === 'boolean') continue
+    lastIndex = res.length - 1
+    last = res[lastIndex]
+    //  nested
+    if (Array.isArray(c)) {
+      if (c.length > 0) {
+        c = normalizeArrayChildren(c, `${nestedIndex || ''}_${i}`)
+        // merge adjacent text nodes
+        if (isTextNode(c[0]) && isTextNode(last)) {
+          res[lastIndex] = createTextVNode(last.text + (c[0]: any).text)
+          c.shift()
+        }
+        res.push.apply(res, c)
+      }
+    } else if (isPrimitive(c)) {
+      if (isTextNode(last)) {
+        // merge adjacent text nodes
+        // this is necessary for SSR hydration because text nodes are
+        // essentially merged when rendered to HTML strings
+        res[lastIndex] = createTextVNode(last.text + c)
+      } else if (c !== '') {
+        // convert primitive to vnode
+        res.push(createTextVNode(c))
+      }
+    } else {
+      if (isTextNode(c) && isTextNode(last)) {
+        // merge adjacent text nodes
+        res[lastIndex] = createTextVNode(last.text + c.text)
+      } else {
+        // default key for nested array children (likely generated by v-for)
+        if (isTrue(children._isVList) &&
+          isDef(c.tag) &&
+          isUndef(c.key) &&
+          isDef(nestedIndex)) {
+          c.key = `__vlist${nestedIndex}_${i}__`
+        }
+        res.push(c)
+      }
+    }
+  }
+  return res
+}
diff --git a/node_modules/vue/src/core/vdom/helpers/resolve-async-component.js b/node_modules/vue/src/core/vdom/helpers/resolve-async-component.js
new file mode 100644
index 00000000..99ce5ce4
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/helpers/resolve-async-component.js
@@ -0,0 +1,140 @@
+/* @flow */
+
+import {
+  warn,
+  once,
+  isDef,
+  isUndef,
+  isTrue,
+  isObject,
+  hasSymbol
+} from 'core/util/index'
+
+import { createEmptyVNode } from 'core/vdom/vnode'
+
+function ensureCtor (comp: any, base) {
+  if (
+    comp.__esModule ||
+    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+  ) {
+    comp = comp.default
+  }
+  return isObject(comp)
+    ? base.extend(comp)
+    : comp
+}
+
+export function createAsyncPlaceholder (
+  factory: Function,
+  data: ?VNodeData,
+  context: Component,
+  children: ?Array<VNode>,
+  tag: ?string
+): VNode {
+  const node = createEmptyVNode()
+  node.asyncFactory = factory
+  node.asyncMeta = { data, context, children, tag }
+  return node
+}
+
+export function resolveAsyncComponent (
+  factory: Function,
+  baseCtor: Class<Component>,
+  context: Component
+): Class<Component> | void {
+  if (isTrue(factory.error) && isDef(factory.errorComp)) {
+    return factory.errorComp
+  }
+
+  if (isDef(factory.resolved)) {
+    return factory.resolved
+  }
+
+  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+    return factory.loadingComp
+  }
+
+  if (isDef(factory.contexts)) {
+    // already pending
+    factory.contexts.push(context)
+  } else {
+    const contexts = factory.contexts = [context]
+    let sync = true
+
+    const forceRender = () => {
+      for (let i = 0, l = contexts.length; i < l; i++) {
+        contexts[i].$forceUpdate()
+      }
+    }
+
+    const resolve = once((res: Object | Class<Component>) => {
+      // cache resolved
+      factory.resolved = ensureCtor(res, baseCtor)
+      // invoke callbacks only if this is not a synchronous resolve
+      // (async resolves are shimmed as synchronous during SSR)
+      if (!sync) {
+        forceRender()
+      }
+    })
+
+    const reject = once(reason => {
+      process.env.NODE_ENV !== 'production' && warn(
+        `Failed to resolve async component: ${String(factory)}` +
+        (reason ? `\nReason: ${reason}` : '')
+      )
+      if (isDef(factory.errorComp)) {
+        factory.error = true
+        forceRender()
+      }
+    })
+
+    const res = factory(resolve, reject)
+
+    if (isObject(res)) {
+      if (typeof res.then === 'function') {
+        // () => Promise
+        if (isUndef(factory.resolved)) {
+          res.then(resolve, reject)
+        }
+      } else if (isDef(res.component) && typeof res.component.then === 'function') {
+        res.component.then(resolve, reject)
+
+        if (isDef(res.error)) {
+          factory.errorComp = ensureCtor(res.error, baseCtor)
+        }
+
+        if (isDef(res.loading)) {
+          factory.loadingComp = ensureCtor(res.loading, baseCtor)
+          if (res.delay === 0) {
+            factory.loading = true
+          } else {
+            setTimeout(() => {
+              if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                factory.loading = true
+                forceRender()
+              }
+            }, res.delay || 200)
+          }
+        }
+
+        if (isDef(res.timeout)) {
+          setTimeout(() => {
+            if (isUndef(factory.resolved)) {
+              reject(
+                process.env.NODE_ENV !== 'production'
+                  ? `timeout (${res.timeout}ms)`
+                  : null
+              )
+            }
+          }, res.timeout)
+        }
+      }
+    }
+
+    sync = false
+    // return in case resolved synchronously
+    return factory.loading
+      ? factory.loadingComp
+      : factory.resolved
+  }
+}
diff --git a/node_modules/vue/src/core/vdom/helpers/update-listeners.js b/node_modules/vue/src/core/vdom/helpers/update-listeners.js
new file mode 100644
index 00000000..11c5a2cd
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/helpers/update-listeners.js
@@ -0,0 +1,83 @@
+/* @flow */
+
+import { warn } from 'core/util/index'
+import { cached, isUndef, isPlainObject } from 'shared/util'
+
+const normalizeEvent = cached((name: string): {
+  name: string,
+  once: boolean,
+  capture: boolean,
+  passive: boolean,
+  handler?: Function,
+  params?: Array<any>
+} => {
+  const passive = name.charAt(0) === '&'
+  name = passive ? name.slice(1) : name
+  const once = name.charAt(0) === '~' // Prefixed last, checked first
+  name = once ? name.slice(1) : name
+  const capture = name.charAt(0) === '!'
+  name = capture ? name.slice(1) : name
+  return {
+    name,
+    once,
+    capture,
+    passive
+  }
+})
+
+export function createFnInvoker (fns: Function | Array<Function>): Function {
+  function invoker () {
+    const fns = invoker.fns
+    if (Array.isArray(fns)) {
+      const cloned = fns.slice()
+      for (let i = 0; i < cloned.length; i++) {
+        cloned[i].apply(null, arguments)
+      }
+    } else {
+      // return handler return value for single handlers
+      return fns.apply(null, arguments)
+    }
+  }
+  invoker.fns = fns
+  return invoker
+}
+
+export function updateListeners (
+  on: Object,
+  oldOn: Object,
+  add: Function,
+  remove: Function,
+  vm: Component
+) {
+  let name, def, cur, old, event
+  for (name in on) {
+    def = cur = on[name]
+    old = oldOn[name]
+    event = normalizeEvent(name)
+    /* istanbul ignore if */
+    if (__WEEX__ && isPlainObject(def)) {
+      cur = def.handler
+      event.params = def.params
+    }
+    if (isUndef(cur)) {
+      process.env.NODE_ENV !== 'production' && warn(
+        `Invalid handler for event "${event.name}": got ` + String(cur),
+        vm
+      )
+    } else if (isUndef(old)) {
+      if (isUndef(cur.fns)) {
+        cur = on[name] = createFnInvoker(cur)
+      }
+      add(event.name, cur, event.once, event.capture, event.passive, event.params)
+    } else if (cur !== old) {
+      old.fns = cur
+      on[name] = old
+    }
+  }
+  for (name in oldOn) {
+    if (isUndef(on[name])) {
+      event = normalizeEvent(name)
+      remove(event.name, oldOn[name], event.capture)
+    }
+  }
+}
diff --git a/node_modules/vue/src/core/vdom/modules/directives.js b/node_modules/vue/src/core/vdom/modules/directives.js
new file mode 100644
index 00000000..639982fa
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/modules/directives.js
@@ -0,0 +1,119 @@
+/* @flow */
+
+import { emptyNode } from 'core/vdom/patch'
+import { resolveAsset, handleError } from 'core/util/index'
+import { mergeVNodeHook } from 'core/vdom/helpers/index'
+
+export default {
+  create: updateDirectives,
+  update: updateDirectives,
+  destroy: function unbindDirectives (vnode: VNodeWithData) {
+    updateDirectives(vnode, emptyNode)
+  }
+}
+
+function updateDirectives (oldVnode: VNodeWithData, vnode: VNodeWithData) {
+  if (oldVnode.data.directives || vnode.data.directives) {
+    _update(oldVnode, vnode)
+  }
+}
+
+function _update (oldVnode, vnode) {
+  const isCreate = oldVnode === emptyNode
+  const isDestroy = vnode === emptyNode
+  const oldDirs = normalizeDirectives(oldVnode.data.directives, oldVnode.context)
+  const newDirs = normalizeDirectives(vnode.data.directives, vnode.context)
+
+  const dirsWithInsert = []
+  const dirsWithPostpatch = []
+
+  let key, oldDir, dir
+  for (key in newDirs) {
+    oldDir = oldDirs[key]
+    dir = newDirs[key]
+    if (!oldDir) {
+      // new directive, bind
+      callHook(dir, 'bind', vnode, oldVnode)
+      if (dir.def && dir.def.inserted) {
+        dirsWithInsert.push(dir)
+      }
+    } else {
+      // existing directive, update
+      dir.oldValue = oldDir.value
+      callHook(dir, 'update', vnode, oldVnode)
+      if (dir.def && dir.def.componentUpdated) {
+        dirsWithPostpatch.push(dir)
+      }
+    }
+  }
+
+  if (dirsWithInsert.length) {
+    const callInsert = () => {
+      for (let i = 0; i < dirsWithInsert.length; i++) {
+        callHook(dirsWithInsert[i], 'inserted', vnode, oldVnode)
+      }
+    }
+    if (isCreate) {
+      mergeVNodeHook(vnode, 'insert', callInsert)
+    } else {
+      callInsert()
+    }
+  }
+
+  if (dirsWithPostpatch.length) {
+    mergeVNodeHook(vnode, 'postpatch', () => {
+      for (let i = 0; i < dirsWithPostpatch.length; i++) {
+        callHook(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode)
+      }
+    })
+  }
+
+  if (!isCreate) {
+    for (key in oldDirs) {
+      if (!newDirs[key]) {
+        // no longer present, unbind
+        callHook(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy)
+      }
+    }
+  }
+}
+
+const emptyModifiers = Object.create(null)
+
+function normalizeDirectives (
+  dirs: ?Array<VNodeDirective>,
+  vm: Component
+): { [key: string]: VNodeDirective } {
+  const res = Object.create(null)
+  if (!dirs) {
+    // $flow-disable-line
+    return res
+  }
+  let i, dir
+  for (i = 0; i < dirs.length; i++) {
+    dir = dirs[i]
+    if (!dir.modifiers) {
+      // $flow-disable-line
+      dir.modifiers = emptyModifiers
+    }
+    res[getRawDirName(dir)] = dir
+    dir.def = resolveAsset(vm.$options, 'directives', dir.name, true)
+  }
+  // $flow-disable-line
+  return res
+}
+
+function getRawDirName (dir: VNodeDirective): string {
+  return dir.rawName || `${dir.name}.${Object.keys(dir.modifiers || {}).join('.')}`
+}
+
+function callHook (dir, hook, vnode, oldVnode, isDestroy) {
+  const fn = dir.def && dir.def[hook]
+  if (fn) {
+    try {
+      fn(vnode.elm, dir, vnode, oldVnode, isDestroy)
+    } catch (e) {
+      handleError(e, vnode.context, `directive ${dir.name} ${hook} hook`)
+    }
+  }
+}
diff --git a/node_modules/vue/src/core/vdom/modules/index.js b/node_modules/vue/src/core/vdom/modules/index.js
new file mode 100644
index 00000000..727c8646
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/modules/index.js
@@ -0,0 +1,7 @@
+import directives from './directives'
+import ref from './ref'
+
+export default [
+  ref,
+  directives
+]
diff --git a/node_modules/vue/src/core/vdom/modules/ref.js b/node_modules/vue/src/core/vdom/modules/ref.js
new file mode 100644
index 00000000..aa9bdcfc
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/modules/ref.js
@@ -0,0 +1,45 @@
+/* @flow */
+
+import { remove, isDef } from 'shared/util'
+
+export default {
+  create (_: any, vnode: VNodeWithData) {
+    registerRef(vnode)
+  },
+  update (oldVnode: VNodeWithData, vnode: VNodeWithData) {
+    if (oldVnode.data.ref !== vnode.data.ref) {
+      registerRef(oldVnode, true)
+      registerRef(vnode)
+    }
+  },
+  destroy (vnode: VNodeWithData) {
+    registerRef(vnode, true)
+  }
+}
+
+export function registerRef (vnode: VNodeWithData, isRemoval: ?boolean) {
+  const key = vnode.data.ref
+  if (!isDef(key)) return
+
+  const vm = vnode.context
+  const ref = vnode.componentInstance || vnode.elm
+  const refs = vm.$refs
+  if (isRemoval) {
+    if (Array.isArray(refs[key])) {
+      remove(refs[key], ref)
+    } else if (refs[key] === ref) {
+      refs[key] = undefined
+    }
+  } else {
+    if (vnode.data.refInFor) {
+      if (!Array.isArray(refs[key])) {
+        refs[key] = [ref]
+      } else if (refs[key].indexOf(ref) < 0) {
+        // $flow-disable-line
+        refs[key].push(ref)
+      }
+    } else {
+      refs[key] = ref
+    }
+  }
+}
diff --git a/node_modules/vue/src/core/vdom/patch.js b/node_modules/vue/src/core/vdom/patch.js
new file mode 100644
index 00000000..9f3bcc65
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/patch.js
@@ -0,0 +1,787 @@
+/**
+ * Virtual DOM patching algorithm based on Snabbdom by
+ * Simon Friis Vindum (@paldepind)
+ * Licensed under the MIT License
+ * https://github.com/paldepind/snabbdom/blob/master/LICENSE
+ *
+ * modified by Evan You (@yyx990803)
+ *
+ * Not type-checking this because this file is perf-critical and the cost
+ * of making flow understand it is not worth it.
+ */
+
+import VNode, { cloneVNode } from './vnode'
+import config from '../config'
+import { SSR_ATTR } from 'shared/constants'
+import { registerRef } from './modules/ref'
+import { traverse } from '../observer/traverse'
+import { activeInstance } from '../instance/lifecycle'
+import { isTextInputType } from 'web/util/element'
+
+import {
+  warn,
+  isDef,
+  isUndef,
+  isTrue,
+  makeMap,
+  isRegExp,
+  isPrimitive
+} from '../util/index'
+
+export const emptyNode = new VNode('', {}, [])
+
+const hooks = ['create', 'activate', 'update', 'remove', 'destroy']
+
+function sameVnode (a, b) {
+  return (
+    a.key === b.key && (
+      (
+        a.tag === b.tag &&
+        a.isComment === b.isComment &&
+        isDef(a.data) === isDef(b.data) &&
+        sameInputType(a, b)
+      ) || (
+        isTrue(a.isAsyncPlaceholder) &&
+        a.asyncFactory === b.asyncFactory &&
+        isUndef(b.asyncFactory.error)
+      )
+    )
+  )
+}
+
+function sameInputType (a, b) {
+  if (a.tag !== 'input') return true
+  let i
+  const typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type
+  const typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type
+  return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)
+}
+
+function createKeyToOldIdx (children, beginIdx, endIdx) {
+  let i, key
+  const map = {}
+  for (i = beginIdx; i <= endIdx; ++i) {
+    key = children[i].key
+    if (isDef(key)) map[key] = i
+  }
+  return map
+}
+
+export function createPatchFunction (backend) {
+  let i, j
+  const cbs = {}
+
+  const { modules, nodeOps } = backend
+
+  for (i = 0; i < hooks.length; ++i) {
+    cbs[hooks[i]] = []
+    for (j = 0; j < modules.length; ++j) {
+      if (isDef(modules[j][hooks[i]])) {
+        cbs[hooks[i]].push(modules[j][hooks[i]])
+      }
+    }
+  }
+
+  function emptyNodeAt (elm) {
+    return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
+  }
+
+  function createRmCb (childElm, listeners) {
+    function remove () {
+      if (--remove.listeners === 0) {
+        removeNode(childElm)
+      }
+    }
+    remove.listeners = listeners
+    return remove
+  }
+
+  function removeNode (el) {
+    const parent = nodeOps.parentNode(el)
+    // element may have already been removed due to v-html / v-text
+    if (isDef(parent)) {
+      nodeOps.removeChild(parent, el)
+    }
+  }
+
+  function isUnknownElement (vnode, inVPre) {
+    return (
+      !inVPre &&
+      !vnode.ns &&
+      !(
+        config.ignoredElements.length &&
+        config.ignoredElements.some(ignore => {
+          return isRegExp(ignore)
+            ? ignore.test(vnode.tag)
+            : ignore === vnode.tag
+        })
+      ) &&
+      config.isUnknownElement(vnode.tag)
+    )
+  }
+
+  let creatingElmInVPre = 0
+
+  function createElm (
+    vnode,
+    insertedVnodeQueue,
+    parentElm,
+    refElm,
+    nested,
+    ownerArray,
+    index
+  ) {
+    if (isDef(vnode.elm) && isDef(ownerArray)) {
+      // This vnode was used in a previous render!
+      // now it's used as a new node, overwriting its elm would cause
+      // potential patch errors down the road when it's used as an insertion
+      // reference node. Instead, we clone the node on-demand before creating
+      // associated DOM element for it.
+      vnode = ownerArray[index] = cloneVNode(vnode)
+    }
+
+    vnode.isRootInsert = !nested // for transition enter check
+    if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
+      return
+    }
+
+    const data = vnode.data
+    const children = vnode.children
+    const tag = vnode.tag
+    if (isDef(tag)) {
+      if (process.env.NODE_ENV !== 'production') {
+        if (data && data.pre) {
+          creatingElmInVPre++
+        }
+        if (isUnknownElement(vnode, creatingElmInVPre)) {
+          warn(
+            'Unknown custom element: <' + tag + '> - did you ' +
+            'register the component correctly? For recursive components, ' +
+            'make sure to provide the "name" option.',
+            vnode.context
+          )
+        }
+      }
+
+      vnode.elm = vnode.ns
+        ? nodeOps.createElementNS(vnode.ns, tag)
+        : nodeOps.createElement(tag, vnode)
+      setScope(vnode)
+
+      /* istanbul ignore if */
+      if (__WEEX__) {
+        // in Weex, the default insertion order is parent-first.
+        // List items can be optimized to use children-first insertion
+        // with append="tree".
+        const appendAsTree = isDef(data) && isTrue(data.appendAsTree)
+        if (!appendAsTree) {
+          if (isDef(data)) {
+            invokeCreateHooks(vnode, insertedVnodeQueue)
+          }
+          insert(parentElm, vnode.elm, refElm)
+        }
+        createChildren(vnode, children, insertedVnodeQueue)
+        if (appendAsTree) {
+          if (isDef(data)) {
+            invokeCreateHooks(vnode, insertedVnodeQueue)
+          }
+          insert(parentElm, vnode.elm, refElm)
+        }
+      } else {
+        createChildren(vnode, children, insertedVnodeQueue)
+        if (isDef(data)) {
+          invokeCreateHooks(vnode, insertedVnodeQueue)
+        }
+        insert(parentElm, vnode.elm, refElm)
+      }
+
+      if (process.env.NODE_ENV !== 'production' && data && data.pre) {
+        creatingElmInVPre--
+      }
+    } else if (isTrue(vnode.isComment)) {
+      vnode.elm = nodeOps.createComment(vnode.text)
+      insert(parentElm, vnode.elm, refElm)
+    } else {
+      vnode.elm = nodeOps.createTextNode(vnode.text)
+      insert(parentElm, vnode.elm, refElm)
+    }
+  }
+
+  function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
+    let i = vnode.data
+    if (isDef(i)) {
+      const isReactivated = isDef(vnode.componentInstance) && i.keepAlive
+      if (isDef(i = i.hook) && isDef(i = i.init)) {
+        i(vnode, false /* hydrating */, parentElm, refElm)
+      }
+      // after calling the init hook, if the vnode is a child component
+      // it should've created a child instance and mounted it. the child
+      // component also has set the placeholder vnode's elm.
+      // in that case we can just return the element and be done.
+      if (isDef(vnode.componentInstance)) {
+        initComponent(vnode, insertedVnodeQueue)
+        if (isTrue(isReactivated)) {
+          reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm)
+        }
+        return true
+      }
+    }
+  }
+
+  function initComponent (vnode, insertedVnodeQueue) {
+    if (isDef(vnode.data.pendingInsert)) {
+      insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert)
+      vnode.data.pendingInsert = null
+    }
+    vnode.elm = vnode.componentInstance.$el
+    if (isPatchable(vnode)) {
+      invokeCreateHooks(vnode, insertedVnodeQueue)
+      setScope(vnode)
+    } else {
+      // empty component root.
+      // skip all element-related modules except for ref (#3455)
+      registerRef(vnode)
+      // make sure to invoke the insert hook
+      insertedVnodeQueue.push(vnode)
+    }
+  }
+
+  function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
+    let i
+    // hack for #4339: a reactivated component with inner transition
+    // does not trigger because the inner node's created hooks are not called
+    // again. It's not ideal to involve module-specific logic in here but
+    // there doesn't seem to be a better way to do it.
+    let innerNode = vnode
+    while (innerNode.componentInstance) {
+      innerNode = innerNode.componentInstance._vnode
+      if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
+        for (i = 0; i < cbs.activate.length; ++i) {
+          cbs.activate[i](emptyNode, innerNode)
+        }
+        insertedVnodeQueue.push(innerNode)
+        break
+      }
+    }
+    // unlike a newly created component,
+    // a reactivated keep-alive component doesn't insert itself
+    insert(parentElm, vnode.elm, refElm)
+  }
+
+  function insert (parent, elm, ref) {
+    if (isDef(parent)) {
+      if (isDef(ref)) {
+        if (ref.parentNode === parent) {
+          nodeOps.insertBefore(parent, elm, ref)
+        }
+      } else {
+        nodeOps.appendChild(parent, elm)
+      }
+    }
+  }
+
+  function createChildren (vnode, children, insertedVnodeQueue) {
+    if (Array.isArray(children)) {
+      if (process.env.NODE_ENV !== 'production') {
+        checkDuplicateKeys(children)
+      }
+      for (let i = 0; i < children.length; ++i) {
+        createElm(children[i], insertedVnodeQueue, vnode.elm, null, true, children, i)
+      }
+    } else if (isPrimitive(vnode.text)) {
+      nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(String(vnode.text)))
+    }
+  }
+
+  function isPatchable (vnode) {
+    while (vnode.componentInstance) {
+      vnode = vnode.componentInstance._vnode
+    }
+    return isDef(vnode.tag)
+  }
+
+  function invokeCreateHooks (vnode, insertedVnodeQueue) {
+    for (let i = 0; i < cbs.create.length; ++i) {
+      cbs.create[i](emptyNode, vnode)
+    }
+    i = vnode.data.hook // Reuse variable
+    if (isDef(i)) {
+      if (isDef(i.create)) i.create(emptyNode, vnode)
+      if (isDef(i.insert)) insertedVnodeQueue.push(vnode)
+    }
+  }
+
+  // set scope id attribute for scoped CSS.
+  // this is implemented as a special case to avoid the overhead
+  // of going through the normal attribute patching process.
+  function setScope (vnode) {
+    let i
+    if (isDef(i = vnode.fnScopeId)) {
+      nodeOps.setStyleScope(vnode.elm, i)
+    } else {
+      let ancestor = vnode
+      while (ancestor) {
+        if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
+          nodeOps.setStyleScope(vnode.elm, i)
+        }
+        ancestor = ancestor.parent
+      }
+    }
+    // for slot content they should also get the scopeId from the host instance.
+    if (isDef(i = activeInstance) &&
+      i !== vnode.context &&
+      i !== vnode.fnContext &&
+      isDef(i = i.$options._scopeId)
+    ) {
+      nodeOps.setStyleScope(vnode.elm, i)
+    }
+  }
+
+  function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
+    for (; startIdx <= endIdx; ++startIdx) {
+      createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm, false, vnodes, startIdx)
+    }
+  }
+
+  function invokeDestroyHook (vnode) {
+    let i, j
+    const data = vnode.data
+    if (isDef(data)) {
+      if (isDef(i = data.hook) && isDef(i = i.destroy)) i(vnode)
+      for (i = 0; i < cbs.destroy.length; ++i) cbs.destroy[i](vnode)
+    }
+    if (isDef(i = vnode.children)) {
+      for (j = 0; j < vnode.children.length; ++j) {
+        invokeDestroyHook(vnode.children[j])
+      }
+    }
+  }
+
+  function removeVnodes (parentElm, vnodes, startIdx, endIdx) {
+    for (; startIdx <= endIdx; ++startIdx) {
+      const ch = vnodes[startIdx]
+      if (isDef(ch)) {
+        if (isDef(ch.tag)) {
+          removeAndInvokeRemoveHook(ch)
+          invokeDestroyHook(ch)
+        } else { // Text node
+          removeNode(ch.elm)
+        }
+      }
+    }
+  }
+
+  function removeAndInvokeRemoveHook (vnode, rm) {
+    if (isDef(rm) || isDef(vnode.data)) {
+      let i
+      const listeners = cbs.remove.length + 1
+      if (isDef(rm)) {
+        // we have a recursively passed down rm callback
+        // increase the listeners count
+        rm.listeners += listeners
+      } else {
+        // directly removing
+        rm = createRmCb(vnode.elm, listeners)
+      }
+      // recursively invoke hooks on child component root node
+      if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
+        removeAndInvokeRemoveHook(i, rm)
+      }
+      for (i = 0; i < cbs.remove.length; ++i) {
+        cbs.remove[i](vnode, rm)
+      }
+      if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
+        i(vnode, rm)
+      } else {
+        rm()
+      }
+    } else {
+      removeNode(vnode.elm)
+    }
+  }
+
+  function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
+    let oldStartIdx = 0
+    let newStartIdx = 0
+    let oldEndIdx = oldCh.length - 1
+    let oldStartVnode = oldCh[0]
+    let oldEndVnode = oldCh[oldEndIdx]
+    let newEndIdx = newCh.length - 1
+    let newStartVnode = newCh[0]
+    let newEndVnode = newCh[newEndIdx]
+    let oldKeyToIdx, idxInOld, vnodeToMove, refElm
+
+    // removeOnly is a special flag used only by <transition-group>
+    // to ensure removed elements stay in correct relative positions
+    // during leaving transitions
+    const canMove = !removeOnly
+
+    if (process.env.NODE_ENV !== 'production') {
+      checkDuplicateKeys(newCh)
+    }
+
+    while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
+      if (isUndef(oldStartVnode)) {
+        oldStartVnode = oldCh[++oldStartIdx] // Vnode has been moved left
+      } else if (isUndef(oldEndVnode)) {
+        oldEndVnode = oldCh[--oldEndIdx]
+      } else if (sameVnode(oldStartVnode, newStartVnode)) {
+        patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue)
+        oldStartVnode = oldCh[++oldStartIdx]
+        newStartVnode = newCh[++newStartIdx]
+      } else if (sameVnode(oldEndVnode, newEndVnode)) {
+        patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue)
+        oldEndVnode = oldCh[--oldEndIdx]
+        newEndVnode = newCh[--newEndIdx]
+      } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
+        patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue)
+        canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm))
+        oldStartVnode = oldCh[++oldStartIdx]
+        newEndVnode = newCh[--newEndIdx]
+      } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
+        patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue)
+        canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm)
+        oldEndVnode = oldCh[--oldEndIdx]
+        newStartVnode = newCh[++newStartIdx]
+      } else {
+        if (isUndef(oldKeyToIdx)) oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx)
+        idxInOld = isDef(newStartVnode.key)
+          ? oldKeyToIdx[newStartVnode.key]
+          : findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx)
+        if (isUndef(idxInOld)) { // New element
+          createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx)
+        } else {
+          vnodeToMove = oldCh[idxInOld]
+          if (sameVnode(vnodeToMove, newStartVnode)) {
+            patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue)
+            oldCh[idxInOld] = undefined
+            canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm)
+          } else {
+            // same key but different element. treat as new element
+            createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx)
+          }
+        }
+        newStartVnode = newCh[++newStartIdx]
+      }
+    }
+    if (oldStartIdx > oldEndIdx) {
+      refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm
+      addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue)
+    } else if (newStartIdx > newEndIdx) {
+      removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx)
+    }
+  }
+
+  function checkDuplicateKeys (children) {
+    const seenKeys = {}
+    for (let i = 0; i < children.length; i++) {
+      const vnode = children[i]
+      const key = vnode.key
+      if (isDef(key)) {
+        if (seenKeys[key]) {
+          warn(
+            `Duplicate keys detected: '${key}'. This may cause an update error.`,
+            vnode.context
+          )
+        } else {
+          seenKeys[key] = true
+        }
+      }
+    }
+  }
+
+  function findIdxInOld (node, oldCh, start, end) {
+    for (let i = start; i < end; i++) {
+      const c = oldCh[i]
+      if (isDef(c) && sameVnode(node, c)) return i
+    }
+  }
+
+  function patchVnode (oldVnode, vnode, insertedVnodeQueue, removeOnly) {
+    if (oldVnode === vnode) {
+      return
+    }
+
+    const elm = vnode.elm = oldVnode.elm
+
+    if (isTrue(oldVnode.isAsyncPlaceholder)) {
+      if (isDef(vnode.asyncFactory.resolved)) {
+        hydrate(oldVnode.elm, vnode, insertedVnodeQueue)
+      } else {
+        vnode.isAsyncPlaceholder = true
+      }
+      return
+    }
+
+    // reuse element for static trees.
+    // note we only do this if the vnode is cloned -
+    // if the new node is not cloned it means the render functions have been
+    // reset by the hot-reload-api and we need to do a proper re-render.
+    if (isTrue(vnode.isStatic) &&
+      isTrue(oldVnode.isStatic) &&
+      vnode.key === oldVnode.key &&
+      (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
+    ) {
+      vnode.componentInstance = oldVnode.componentInstance
+      return
+    }
+
+    let i
+    const data = vnode.data
+    if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
+      i(oldVnode, vnode)
+    }
+
+    const oldCh = oldVnode.children
+    const ch = vnode.children
+    if (isDef(data) && isPatchable(vnode)) {
+      for (i = 0; i < cbs.update.length; ++i) cbs.update[i](oldVnode, vnode)
+      if (isDef(i = data.hook) && isDef(i = i.update)) i(oldVnode, vnode)
+    }
+    if (isUndef(vnode.text)) {
+      if (isDef(oldCh) && isDef(ch)) {
+        if (oldCh !== ch) updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly)
+      } else if (isDef(ch)) {
+        if (isDef(oldVnode.text)) nodeOps.setTextContent(elm, '')
+        addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue)
+      } else if (isDef(oldCh)) {
+        removeVnodes(elm, oldCh, 0, oldCh.length - 1)
+      } else if (isDef(oldVnode.text)) {
+        nodeOps.setTextContent(elm, '')
+      }
+    } else if (oldVnode.text !== vnode.text) {
+      nodeOps.setTextContent(elm, vnode.text)
+    }
+    if (isDef(data)) {
+      if (isDef(i = data.hook) && isDef(i = i.postpatch)) i(oldVnode, vnode)
+    }
+  }
+
+  function invokeInsertHook (vnode, queue, initial) {
+    // delay insert hooks for component root nodes, invoke them after the
+    // element is really inserted
+    if (isTrue(initial) && isDef(vnode.parent)) {
+      vnode.parent.data.pendingInsert = queue
+    } else {
+      for (let i = 0; i < queue.length; ++i) {
+        queue[i].data.hook.insert(queue[i])
+      }
+    }
+  }
+
+  let hydrationBailed = false
+  // list of modules that can skip create hook during hydration because they
+  // are already rendered on the client or has no need for initialization
+  // Note: style is excluded because it relies on initial clone for future
+  // deep updates (#7063).
+  const isRenderedModule = makeMap('attrs,class,staticClass,staticStyle,key')
+
+  // Note: this is a browser-only function so we can assume elms are DOM nodes.
+  function hydrate (elm, vnode, insertedVnodeQueue, inVPre) {
+    let i
+    const { tag, data, children } = vnode
+    inVPre = inVPre || (data && data.pre)
+    vnode.elm = elm
+
+    if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
+      vnode.isAsyncPlaceholder = true
+      return true
+    }
+    // assert node match
+    if (process.env.NODE_ENV !== 'production') {
+      if (!assertNodeMatch(elm, vnode, inVPre)) {
+        return false
+      }
+    }
+    if (isDef(data)) {
+      if (isDef(i = data.hook) && isDef(i = i.init)) i(vnode, true /* hydrating */)
+      if (isDef(i = vnode.componentInstance)) {
+        // child component. it should have hydrated its own tree.
+        initComponent(vnode, insertedVnodeQueue)
+        return true
+      }
+    }
+    if (isDef(tag)) {
+      if (isDef(children)) {
+        // empty element, allow client to pick up and populate children
+        if (!elm.hasChildNodes()) {
+          createChildren(vnode, children, insertedVnodeQueue)
+        } else {
+          // v-html and domProps: innerHTML
+          if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {
+            if (i !== elm.innerHTML) {
+              /* istanbul ignore if */
+              if (process.env.NODE_ENV !== 'production' &&
+                typeof console !== 'undefined' &&
+                !hydrationBailed
+              ) {
+                hydrationBailed = true
+                console.warn('Parent: ', elm)
+                console.warn('server innerHTML: ', i)
+                console.warn('client innerHTML: ', elm.innerHTML)
+              }
+              return false
+            }
+          } else {
+            // iterate and compare children lists
+            let childrenMatch = true
+            let childNode = elm.firstChild
+            for (let i = 0; i < children.length; i++) {
+              if (!childNode || !hydrate(childNode, children[i], insertedVnodeQueue, inVPre)) {
+                childrenMatch = false
+                break
+              }
+              childNode = childNode.nextSibling
+            }
+            // if childNode is not null, it means the actual childNodes list is
+            // longer than the virtual children list.
+            if (!childrenMatch || childNode) {
+              /* istanbul ignore if */
+              if (process.env.NODE_ENV !== 'production' &&
+                typeof console !== 'undefined' &&
+                !hydrationBailed
+              ) {
+                hydrationBailed = true
+                console.warn('Parent: ', elm)
+                console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children)
+              }
+              return false
+            }
+          }
+        }
+      }
+      if (isDef(data)) {
+        let fullInvoke = false
+        for (const key in data) {
+          if (!isRenderedModule(key)) {
+            fullInvoke = true
+            invokeCreateHooks(vnode, insertedVnodeQueue)
+            break
+          }
+        }
+        if (!fullInvoke && data['class']) {
+          // ensure collecting deps for deep class bindings for future updates
+          traverse(data['class'])
+        }
+      }
+    } else if (elm.data !== vnode.text) {
+      elm.data = vnode.text
+    }
+    return true
+  }
+
+  function assertNodeMatch (node, vnode, inVPre) {
+    if (isDef(vnode.tag)) {
+      return vnode.tag.indexOf('vue-component') === 0 || (
+        !isUnknownElement(vnode, inVPre) &&
+        vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
+      )
+    } else {
+      return node.nodeType === (vnode.isComment ? 8 : 3)
+    }
+  }
+
+  return function patch (oldVnode, vnode, hydrating, removeOnly, parentElm, refElm) {
+    if (isUndef(vnode)) {
+      if (isDef(oldVnode)) invokeDestroyHook(oldVnode)
+      return
+    }
+
+    let isInitialPatch = false
+    const insertedVnodeQueue = []
+
+    if (isUndef(oldVnode)) {
+      // empty mount (likely as component), create new root element
+      isInitialPatch = true
+      createElm(vnode, insertedVnodeQueue, parentElm, refElm)
+    } else {
+      const isRealElement = isDef(oldVnode.nodeType)
+      if (!isRealElement && sameVnode(oldVnode, vnode)) {
+        // patch existing root node
+        patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly)
+      } else {
+        if (isRealElement) {
+          // mounting to a real element
+          // check if this is server-rendered content and if we can perform
+          // a successful hydration.
+          if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
+            oldVnode.removeAttribute(SSR_ATTR)
+            hydrating = true
+          }
+          if (isTrue(hydrating)) {
+            if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
+              invokeInsertHook(vnode, insertedVnodeQueue, true)
+              return oldVnode
+            } else if (process.env.NODE_ENV !== 'production') {
+              warn(
+                'The client-side rendered virtual DOM tree is not matching ' +
+                'server-rendered content. This is likely caused by incorrect ' +
+                'HTML markup, for example nesting block-level elements inside ' +
+                '<p>, or missing <tbody>. Bailing hydration and performing ' +
+                'full client-side render.'
+              )
+            }
+          }
+          // either not server-rendered, or hydration failed.
+          // create an empty node and replace it
+          oldVnode = emptyNodeAt(oldVnode)
+        }
+
+        // replacing existing element
+        const oldElm = oldVnode.elm
+        const parentElm = nodeOps.parentNode(oldElm)
+
+        // create new node
+        createElm(
+          vnode,
+          insertedVnodeQueue,
+          // extremely rare edge case: do not insert if old element is in a
+          // leaving transition. Only happens when combining transition +
+          // keep-alive + HOCs. (#4590)
+          oldElm._leaveCb ? null : parentElm,
+          nodeOps.nextSibling(oldElm)
+        )
+
+        // update parent placeholder node element, recursively
+        if (isDef(vnode.parent)) {
+          let ancestor = vnode.parent
+          const patchable = isPatchable(vnode)
+          while (ancestor) {
+            for (let i = 0; i < cbs.destroy.length; ++i) {
+              cbs.destroy[i](ancestor)
+            }
+            ancestor.elm = vnode.elm
+            if (patchable) {
+              for (let i = 0; i < cbs.create.length; ++i) {
+                cbs.create[i](emptyNode, ancestor)
+              }
+              // #6513
+              // invoke insert hooks that may have been merged by create hooks.
+              // e.g. for directives that uses the "inserted" hook.
+              const insert = ancestor.data.hook.insert
+              if (insert.merged) {
+                // start at index 1 to avoid re-invoking component mounted hook
+                for (let i = 1; i < insert.fns.length; i++) {
+                  insert.fns[i]()
+                }
+              }
+            } else {
+              registerRef(ancestor)
+            }
+            ancestor = ancestor.parent
+          }
+        }
+
+        // destroy old node
+        if (isDef(parentElm)) {
+          removeVnodes(parentElm, [oldVnode], 0, 0)
+        } else if (isDef(oldVnode.tag)) {
+          invokeDestroyHook(oldVnode)
+        }
+      }
+    }
+
+    invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch)
+    return vnode.elm
+  }
+}
diff --git a/node_modules/vue/src/core/vdom/vnode.js b/node_modules/vue/src/core/vdom/vnode.js
new file mode 100644
index 00000000..88e80cec
--- /dev/null
+++ b/node_modules/vue/src/core/vdom/vnode.js
@@ -0,0 +1,108 @@
+/* @flow */
+
+export default class VNode {
+  tag: string | void;
+  data: VNodeData | void;
+  children: ?Array<VNode>;
+  text: string | void;
+  elm: Node | void;
+  ns: string | void;
+  context: Component | void; // rendered in this component's scope
+  key: string | number | void;
+  componentOptions: VNodeComponentOptions | void;
+  componentInstance: Component | void; // component instance
+  parent: VNode | void; // component placeholder node
+
+  // strictly internal
+  raw: boolean; // contains raw HTML? (server only)
+  isStatic: boolean; // hoisted static node
+  isRootInsert: boolean; // necessary for enter transition check
+  isComment: boolean; // empty comment placeholder?
+  isCloned: boolean; // is a cloned node?
+  isOnce: boolean; // is a v-once node?
+  asyncFactory: Function | void; // async component factory function
+  asyncMeta: Object | void;
+  isAsyncPlaceholder: boolean;
+  ssrContext: Object | void;
+  fnContext: Component | void; // real context vm for functional nodes
+  fnOptions: ?ComponentOptions; // for SSR caching
+  fnScopeId: ?string; // functional scope id support
+
+  constructor (
+    tag?: string,
+    data?: VNodeData,
+    children?: ?Array<VNode>,
+    text?: string,
+    elm?: Node,
+    context?: Component,
+    componentOptions?: VNodeComponentOptions,
+    asyncFactory?: Function
+  ) {
+    this.tag = tag
+    this.data = data
+    this.children = children
+    this.text = text
+    this.elm = elm
+    this.ns = undefined
+    this.context = context
+    this.fnContext = undefined
+    this.fnOptions = undefined
+    this.fnScopeId = undefined
+    this.key = data && data.key
+    this.componentOptions = componentOptions
+    this.componentInstance = undefined
+    this.parent = undefined
+    this.raw = false
+    this.isStatic = false
+    this.isRootInsert = true
+    this.isComment = false
+    this.isCloned = false
+    this.isOnce = false
+    this.asyncFactory = asyncFactory
+    this.asyncMeta = undefined
+    this.isAsyncPlaceholder = false
+  }
+
+  // DEPRECATED: alias for componentInstance for backwards compat.
+  /* istanbul ignore next */
+  get child (): Component | void {
+    return this.componentInstance
+  }
+}
+
+export const createEmptyVNode = (text: string = '') => {
+  const node = new VNode()
+  node.text = text
+  node.isComment = true
+  return node
+}
+
+export function createTextVNode (val: string | number) {
+  return new VNode(undefined, undefined, undefined, String(val))
+}
+
+// optimized shallow clone
+// used for static nodes and slot nodes because they may be reused across
+// multiple renders, cloning them avoids errors when DOM manipulations rely
+// on their elm reference.
+export function cloneVNode (vnode: VNode): VNode {
+  const cloned = new VNode(
+    vnode.tag,
+    vnode.data,
+    vnode.children,
+    vnode.text,
+    vnode.elm,
+    vnode.context,
+    vnode.componentOptions,
+    vnode.asyncFactory
+  )
+  cloned.ns = vnode.ns
+  cloned.isStatic = vnode.isStatic
+  cloned.key = vnode.key
+  cloned.isComment = vnode.isComment
+  cloned.fnContext = vnode.fnContext
+  cloned.fnOptions = vnode.fnOptions
+  cloned.fnScopeId = vnode.fnScopeId
+  cloned.isCloned = true
+  return cloned
+}
-- 
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