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'symbol' ||\n      typeof value === 'boolean'\n    )\n  }\n\n  /**\n   * Quick object check - this is primarily used to tell\n   * Objects from primitive values when we know the value\n   * is a JSON-compliant type.\n   */\n  function isObject (obj) {\n    return obj !== null && typeof obj === 'object'\n  }\n\n  /**\n   * Get the raw type string of a value, e.g., [object Object].\n   */\n  var _toString = Object.prototype.toString;\n\n  function toRawType (value) {\n    return _toString.call(value).slice(8, -1)\n  }\n\n  /**\n   * Strict object type check. 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Technically, we don't need this anymore\n   * since native bind is now performant enough in most browsers.\n   * But removing it would mean breaking code that was able to run in\n   * PhantomJS 1.x, so this must be kept for backward compatibility.\n   */\n\n  /* istanbul ignore next */\n  function polyfillBind (fn, ctx) {\n    function boundFn (a) {\n      var l = arguments.length;\n      return l\n        ? l > 1\n          ? fn.apply(ctx, arguments)\n          : fn.call(ctx, a)\n        : fn.call(ctx)\n    }\n\n    boundFn._length = fn.length;\n    return boundFn\n  }\n\n  function nativeBind (fn, ctx) {\n    return fn.bind(ctx)\n  }\n\n  var bind = Function.prototype.bind\n    ? nativeBind\n    : polyfillBind;\n\n  /**\n   * Convert an Array-like object to a real Array.\n   */\n  function toArray (list, start) {\n    start = start || 0;\n    var i = list.length - start;\n    var ret = new Array(i);\n    while (i--) {\n      ret[i] = list[i + start];\n    }\n    return ret\n  }\n\n  /**\n   * Mix properties into target object.\n   */\n  function extend (to, _from) {\n    for (var key in _from) {\n      to[key] = _from[key];\n    }\n    return to\n  }\n\n  /**\n   * Merge an Array of Objects into a single Object.\n   */\n  function toObject (arr) {\n    var res = {};\n    for (var i = 0; i < arr.length; i++) {\n      if (arr[i]) {\n        extend(res, arr[i]);\n      }\n    }\n    return res\n  }\n\n  /* eslint-disable no-unused-vars */\n\n  /**\n   * Perform no operation.\n   * Stubbing args to make Flow happy without leaving useless transpiled code\n   * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/).\n   */\n  function noop (a, b, c) {}\n\n  /**\n   * Always return false.\n   */\n  var no = function (a, b, c) { return false; };\n\n  /* eslint-enable no-unused-vars */\n\n  /**\n   * Return the same value.\n   */\n  var identity = function (_) { return _; };\n\n  /**\n   * Generate a string containing static keys from compiler modules.\n   */\n  function genStaticKeys (modules) {\n    return modules.reduce(function (keys, m) {\n      return keys.concat(m.staticKeys || [])\n    }, []).join(',')\n  }\n\n  /**\n   * Check if two values are loosely equal - that is,\n   * if they are plain objects, do they have the same shape?\n   */\n  function looseEqual (a, b) {\n    if (a === b) { return true }\n    var isObjectA = isObject(a);\n    var isObjectB = isObject(b);\n    if (isObjectA && isObjectB) {\n      try {\n        var isArrayA = Array.isArray(a);\n        var isArrayB = Array.isArray(b);\n        if (isArrayA && isArrayB) {\n          return a.length === b.length && a.every(function (e, i) {\n            return looseEqual(e, b[i])\n          })\n        } else if (a instanceof Date && b instanceof Date) {\n          return a.getTime() === b.getTime()\n        } else if (!isArrayA && !isArrayB) {\n          var keysA = Object.keys(a);\n          var keysB = Object.keys(b);\n          return keysA.length === keysB.length && keysA.every(function (key) {\n            return looseEqual(a[key], b[key])\n          })\n        } else {\n          /* istanbul ignore next */\n          return false\n        }\n      } catch (e) {\n        /* istanbul ignore next */\n        return false\n      }\n    } else if (!isObjectA && !isObjectB) {\n      return String(a) === String(b)\n    } else {\n      return false\n    }\n  }\n\n  /**\n   * Return the first index at which a loosely equal value can be\n   * found in the array (if value is a plain object, the array must\n   * contain an object of the same shape), or -1 if it is not present.\n   */\n  function looseIndexOf (arr, val) {\n    for (var i = 0; i < arr.length; i++) {\n      if (looseEqual(arr[i], val)) { return i }\n    }\n    return -1\n  }\n\n  /**\n   * Ensure a function is called only once.\n   */\n  function once (fn) {\n    var called = false;\n    return function () {\n      if (!called) {\n        called = true;\n        fn.apply(this, arguments);\n      }\n    }\n  }\n\n  var SSR_ATTR = 'data-server-rendered';\n\n  var ASSET_TYPES = [\n    'component',\n    'directive',\n    'filter'\n  ];\n\n  var LIFECYCLE_HOOKS = [\n    'beforeCreate',\n    'created',\n    'beforeMount',\n    'mounted',\n    'beforeUpdate',\n    'updated',\n    'beforeDestroy',\n    'destroyed',\n    'activated',\n    'deactivated',\n    'errorCaptured'\n  ];\n\n  /*  */\n\n\n\n  var config = ({\n    /**\n     * Option merge strategies (used in core/util/options)\n     */\n    // $flow-disable-line\n    optionMergeStrategies: Object.create(null),\n\n    /**\n     * Whether to suppress warnings.\n     */\n    silent: false,\n\n    /**\n     * Show production mode tip message on boot?\n     */\n    productionTip: \"development\" !== 'production',\n\n    /**\n     * Whether to enable devtools\n     */\n    devtools: \"development\" !== 'production',\n\n    /**\n     * Whether to record perf\n     */\n    performance: false,\n\n    /**\n     * Error handler for watcher errors\n     */\n    errorHandler: null,\n\n    /**\n     * Warn handler for watcher warns\n     */\n    warnHandler: null,\n\n    /**\n     * Ignore certain custom elements\n     */\n    ignoredElements: [],\n\n    /**\n     * Custom user key aliases for v-on\n     */\n    // $flow-disable-line\n    keyCodes: Object.create(null),\n\n    /**\n     * Check if a tag is reserved so that it cannot be registered as a\n     * component. This is platform-dependent and may be overwritten.\n     */\n    isReservedTag: no,\n\n    /**\n     * Check if an attribute is reserved so that it cannot be used as a component\n     * prop. This is platform-dependent and may be overwritten.\n     */\n    isReservedAttr: no,\n\n    /**\n     * Check if a tag is an unknown element.\n     * Platform-dependent.\n     */\n    isUnknownElement: no,\n\n    /**\n     * Get the namespace of an element\n     */\n    getTagNamespace: noop,\n\n    /**\n     * Parse the real tag name for the specific platform.\n     */\n    parsePlatformTagName: identity,\n\n    /**\n     * Check if an attribute must be bound using property, e.g. value\n     * Platform-dependent.\n     */\n    mustUseProp: no,\n\n    /**\n     * Perform updates asynchronously. Intended to be used by Vue Test Utils\n     * This will significantly reduce performance if set to false.\n     */\n    async: true,\n\n    /**\n     * Exposed for legacy reasons\n     */\n    _lifecycleHooks: LIFECYCLE_HOOKS\n  });\n\n  /*  */\n\n  /**\n   * Check if a string starts with $ or _\n   */\n  function isReserved (str) {\n    var c = (str + '').charCodeAt(0);\n    return c === 0x24 || c === 0x5F\n  }\n\n  /**\n   * Define a property.\n   */\n  function def (obj, key, val, enumerable) {\n    Object.defineProperty(obj, key, {\n      value: val,\n      enumerable: !!enumerable,\n      writable: true,\n      configurable: true\n    });\n  }\n\n  /**\n   * Parse simple path.\n   */\n  var bailRE = /[^\\w.$]/;\n  function parsePath (path) {\n    if (bailRE.test(path)) {\n      return\n    }\n    var segments = path.split('.');\n    return function (obj) {\n      for (var i = 0; i < segments.length; i++) {\n        if (!obj) { return }\n        obj = obj[segments[i]];\n      }\n      return obj\n    }\n  }\n\n  /*  */\n\n  // can we use __proto__?\n  var hasProto = '__proto__' in {};\n\n  // Browser environment sniffing\n  var inBrowser = typeof window !== 'undefined';\n  var inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform;\n  var weexPlatform = inWeex && WXEnvironment.platform.toLowerCase();\n  var UA = inBrowser && window.navigator.userAgent.toLowerCase();\n  var isIE = UA && /msie|trident/.test(UA);\n  var isIE9 = UA && UA.indexOf('msie 9.0') > 0;\n  var isEdge = UA && UA.indexOf('edge/') > 0;\n  var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android');\n  var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');\n  var isChrome = UA && /chrome\\/\\d+/.test(UA) && !isEdge;\n\n  // Firefox has a \"watch\" function on Object.prototype...\n  var nativeWatch = ({}).watch;\n\n  var supportsPassive = false;\n  if (inBrowser) {\n    try {\n      var opts = {};\n      Object.defineProperty(opts, 'passive', ({\n        get: function get () {\n          /* istanbul ignore next */\n          supportsPassive = true;\n        }\n      })); // https://github.com/facebook/flow/issues/285\n      window.addEventListener('test-passive', null, opts);\n    } catch (e) {}\n  }\n\n  // this needs to be lazy-evaled because vue may be required before\n  // vue-server-renderer can set VUE_ENV\n  var _isServer;\n  var isServerRendering = function () {\n    if (_isServer === undefined) {\n      /* istanbul ignore if */\n      if (!inBrowser && !inWeex && typeof global !== 'undefined') {\n        // detect presence of vue-server-renderer and avoid\n        // Webpack shimming the process\n        _isServer = global['process'] && global['process'].env.VUE_ENV === 'server';\n      } else {\n        _isServer = false;\n      }\n    }\n    return _isServer\n  };\n\n  // detect devtools\n  var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;\n\n  /* istanbul ignore next */\n  function isNative (Ctor) {\n    return typeof Ctor === 'function' && /native code/.test(Ctor.toString())\n  }\n\n  var hasSymbol =\n    typeof Symbol !== 'undefined' && isNative(Symbol) &&\n    typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);\n\n  var _Set;\n  /* istanbul ignore if */ // $flow-disable-line\n  if (typeof Set !== 'undefined' && isNative(Set)) {\n    // use native Set when available.\n    _Set = Set;\n  } else {\n    // a non-standard Set polyfill that only works with primitive keys.\n    _Set = /*@__PURE__*/(function () {\n      function Set () {\n        this.set = Object.create(null);\n      }\n      Set.prototype.has = function has (key) {\n        return this.set[key] === true\n      };\n      Set.prototype.add = function add (key) {\n        this.set[key] = true;\n      };\n      Set.prototype.clear = function clear () {\n        this.set = Object.create(null);\n      };\n\n      return Set;\n    }());\n  }\n\n  /*  */\n\n  var warn = noop;\n  var tip = noop;\n  var generateComponentTrace = (noop); // work around flow check\n  var formatComponentName = (noop);\n\n  {\n    var hasConsole = typeof console !== 'undefined';\n    var classifyRE = /(?:^|[-_])(\\w)/g;\n    var classify = function (str) { return str\n      .replace(classifyRE, function (c) { return c.toUpperCase(); })\n      .replace(/[-_]/g, ''); };\n\n    warn = function (msg, vm) {\n      var trace = vm ? generateComponentTrace(vm) : '';\n\n      if (config.warnHandler) {\n        config.warnHandler.call(null, msg, vm, trace);\n      } else if (hasConsole && (!config.silent)) {\n        console.error((\"[Vue warn]: \" + msg + trace));\n      }\n    };\n\n    tip = function (msg, vm) {\n      if (hasConsole && (!config.silent)) {\n        console.warn(\"[Vue tip]: \" + msg + (\n          vm ? generateComponentTrace(vm) : ''\n        ));\n      }\n    };\n\n    formatComponentName = function (vm, includeFile) {\n      if (vm.$root === vm) {\n        return '<Root>'\n      }\n      var options = typeof vm === 'function' && vm.cid != null\n        ? vm.options\n        : vm._isVue\n          ? vm.$options || vm.constructor.options\n          : vm;\n      var name = options.name || options._componentTag;\n      var file = options.__file;\n      if (!name && file) {\n        var match = file.match(/([^/\\\\]+)\\.vue$/);\n        name = match && match[1];\n      }\n\n      return (\n        (name ? (\"<\" + (classify(name)) + \">\") : \"<Anonymous>\") +\n        (file && includeFile !== false ? (\" at \" + file) : '')\n      )\n    };\n\n    var repeat = function (str, n) {\n      var res = '';\n      while (n) {\n        if (n % 2 === 1) { res += str; }\n        if (n > 1) { str += str; }\n        n >>= 1;\n      }\n      return res\n    };\n\n    generateComponentTrace = function (vm) {\n      if (vm._isVue && vm.$parent) {\n        var tree = [];\n        var currentRecursiveSequence = 0;\n        while (vm) {\n          if (tree.length > 0) {\n            var last = tree[tree.length - 1];\n            if (last.constructor === vm.constructor) {\n              currentRecursiveSequence++;\n              vm = vm.$parent;\n              continue\n            } else if (currentRecursiveSequence > 0) {\n              tree[tree.length - 1] = [last, currentRecursiveSequence];\n              currentRecursiveSequence = 0;\n            }\n          }\n          tree.push(vm);\n          vm = vm.$parent;\n        }\n        return '\\n\\nfound in\\n\\n' + tree\n          .map(function (vm, i) { return (\"\" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm)\n              ? ((formatComponentName(vm[0])) + \"... (\" + (vm[1]) + \" recursive calls)\")\n              : formatComponentName(vm))); })\n          .join('\\n')\n      } else {\n        return (\"\\n\\n(found in \" + (formatComponentName(vm)) + \")\")\n      }\n    };\n  }\n\n  /*  */\n\n  var uid = 0;\n\n  /**\n   * A dep is an observable that can have multiple\n   * directives subscribing to it.\n   */\n  var Dep = function Dep () {\n    this.id = uid++;\n    this.subs = [];\n  };\n\n  Dep.prototype.addSub = function addSub (sub) {\n    this.subs.push(sub);\n  };\n\n  Dep.prototype.removeSub = function removeSub (sub) {\n    remove(this.subs, sub);\n  };\n\n  Dep.prototype.depend = function depend () {\n    if (Dep.target) {\n      Dep.target.addDep(this);\n    }\n  };\n\n  Dep.prototype.notify = function notify () {\n    // stabilize the subscriber list first\n    var subs = this.subs.slice();\n    if (!config.async) {\n      // subs aren't sorted in scheduler if not running async\n      // we need to sort them now to make sure they fire in correct\n      // order\n      subs.sort(function (a, b) { return a.id - b.id; });\n    }\n    for (var i = 0, l = subs.length; i < l; i++) {\n      subs[i].update();\n    }\n  };\n\n  // The current target watcher being evaluated.\n  // This is globally unique because only one watcher\n  // can be evaluated at a time.\n  Dep.target = null;\n  var targetStack = [];\n\n  function pushTarget (target) {\n    targetStack.push(target);\n    Dep.target = target;\n  }\n\n  function popTarget () {\n    targetStack.pop();\n    Dep.target = targetStack[targetStack.length - 1];\n  }\n\n  /*  */\n\n  var VNode = function VNode (\n    tag,\n    data,\n    children,\n    text,\n    elm,\n    context,\n    componentOptions,\n    asyncFactory\n  ) {\n    this.tag = tag;\n    this.data = data;\n    this.children = children;\n    this.text = text;\n    this.elm = elm;\n    this.ns = undefined;\n    this.context = context;\n    this.fnContext = undefined;\n    this.fnOptions = undefined;\n    this.fnScopeId = undefined;\n    this.key = data && data.key;\n    this.componentOptions = componentOptions;\n    this.componentInstance = undefined;\n    this.parent = undefined;\n    this.raw = false;\n    this.isStatic = false;\n    this.isRootInsert = true;\n    this.isComment = false;\n    this.isCloned = false;\n    this.isOnce = false;\n    this.asyncFactory = asyncFactory;\n    this.asyncMeta = undefined;\n    this.isAsyncPlaceholder = false;\n  };\n\n  var prototypeAccessors = { child: { configurable: true } };\n\n  // DEPRECATED: alias for componentInstance for backwards compat.\n  /* istanbul ignore next */\n  prototypeAccessors.child.get = function () {\n    return this.componentInstance\n  };\n\n  Object.defineProperties( VNode.prototype, prototypeAccessors );\n\n  var createEmptyVNode = function (text) {\n    if ( text === void 0 ) text = '';\n\n    var node = new VNode();\n    node.text = text;\n    node.isComment = true;\n    return node\n  };\n\n  function createTextVNode (val) {\n    return new VNode(undefined, undefined, undefined, String(val))\n  }\n\n  // optimized shallow clone\n  // used for static nodes and slot nodes because they may be reused across\n  // multiple renders, cloning them avoids errors when DOM manipulations rely\n  // on their elm reference.\n  function cloneVNode (vnode) {\n    var cloned = new VNode(\n      vnode.tag,\n      vnode.data,\n      // #7975\n      // clone children array to avoid mutating original in case of cloning\n      // a child.\n      vnode.children && vnode.children.slice(),\n      vnode.text,\n      vnode.elm,\n      vnode.context,\n      vnode.componentOptions,\n      vnode.asyncFactory\n    );\n    cloned.ns = vnode.ns;\n    cloned.isStatic = vnode.isStatic;\n    cloned.key = vnode.key;\n    cloned.isComment = vnode.isComment;\n    cloned.fnContext = vnode.fnContext;\n    cloned.fnOptions = vnode.fnOptions;\n    cloned.fnScopeId = vnode.fnScopeId;\n    cloned.asyncMeta = vnode.asyncMeta;\n    cloned.isCloned = true;\n    return cloned\n  }\n\n  /*\n   * not type checking this file because flow doesn't play well with\n   * dynamically accessing methods on Array prototype\n   */\n\n  var arrayProto = Array.prototype;\n  var arrayMethods = Object.create(arrayProto);\n\n  var methodsToPatch = [\n    'push',\n    'pop',\n    'shift',\n    'unshift',\n    'splice',\n    'sort',\n    'reverse'\n  ];\n\n  /**\n   * Intercept mutating methods and emit events\n   */\n  methodsToPatch.forEach(function (method) {\n    // cache original method\n    var original = arrayProto[method];\n    def(arrayMethods, method, function mutator () {\n      var args = [], len = arguments.length;\n      while ( len-- ) args[ len ] = arguments[ len ];\n\n      var result = original.apply(this, args);\n      var ob = this.__ob__;\n      var inserted;\n      switch (method) {\n        case 'push':\n        case 'unshift':\n          inserted = args;\n          break\n        case 'splice':\n          inserted = args.slice(2);\n          break\n      }\n      if (inserted) { ob.observeArray(inserted); }\n      // notify change\n      ob.dep.notify();\n      return result\n    });\n  });\n\n  /*  */\n\n  var arrayKeys = Object.getOwnPropertyNames(arrayMethods);\n\n  /**\n   * In some cases we may want to disable observation inside a component's\n   * update computation.\n   */\n  var shouldObserve = true;\n\n  function toggleObserving (value) {\n    shouldObserve = value;\n  }\n\n  /**\n   * Observer class that is attached to each observed\n   * object. Once attached, the observer converts the target\n   * object's property keys into getter/setters that\n   * collect dependencies and dispatch updates.\n   */\n  var Observer = function Observer (value) {\n    this.value = value;\n    this.dep = new Dep();\n    this.vmCount = 0;\n    def(value, '__ob__', this);\n    if (Array.isArray(value)) {\n      if (hasProto) {\n        protoAugment(value, arrayMethods);\n      } else {\n        copyAugment(value, arrayMethods, arrayKeys);\n      }\n      this.observeArray(value);\n    } else {\n      this.walk(value);\n    }\n  };\n\n  /**\n   * Walk through all properties and convert them into\n   * getter/setters. This method should only be called when\n   * value type is Object.\n   */\n  Observer.prototype.walk = function walk (obj) {\n    var keys = Object.keys(obj);\n    for (var i = 0; i < keys.length; i++) {\n      defineReactive$$1(obj, keys[i]);\n    }\n  };\n\n  /**\n   * Observe a list of Array items.\n   */\n  Observer.prototype.observeArray = function observeArray (items) {\n    for (var i = 0, l = items.length; i < l; i++) {\n      observe(items[i]);\n    }\n  };\n\n  // helpers\n\n  /**\n   * Augment a target Object or Array by intercepting\n   * the prototype chain using __proto__\n   */\n  function protoAugment (target, src) {\n    /* eslint-disable no-proto */\n    target.__proto__ = src;\n    /* eslint-enable no-proto */\n  }\n\n  /**\n   * Augment a target Object or Array by defining\n   * hidden properties.\n   */\n  /* istanbul ignore next */\n  function copyAugment (target, src, keys) {\n    for (var i = 0, l = keys.length; i < l; i++) {\n      var key = keys[i];\n      def(target, key, src[key]);\n    }\n  }\n\n  /**\n   * Attempt to create an observer instance for a value,\n   * returns the new observer if successfully observed,\n   * or the existing observer if the value already has one.\n   */\n  function observe (value, asRootData) {\n    if (!isObject(value) || value instanceof VNode) {\n      return\n    }\n    var ob;\n    if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {\n      ob = value.__ob__;\n    } else if (\n      shouldObserve &&\n      !isServerRendering() &&\n      (Array.isArray(value) || isPlainObject(value)) &&\n      Object.isExtensible(value) &&\n      !value._isVue\n    ) {\n      ob = new Observer(value);\n    }\n    if (asRootData && ob) {\n      ob.vmCount++;\n    }\n    return ob\n  }\n\n  /**\n   * Define a reactive property on an Object.\n   */\n  function defineReactive$$1 (\n    obj,\n    key,\n    val,\n    customSetter,\n    shallow\n  ) {\n    var dep = new Dep();\n\n    var property = Object.getOwnPropertyDescriptor(obj, key);\n    if (property && property.configurable === false) {\n      return\n    }\n\n    // cater for pre-defined getter/setters\n    var getter = property && property.get;\n    var setter = property && property.set;\n    if ((!getter || setter) && arguments.length === 2) {\n      val = obj[key];\n    }\n\n    var childOb = !shallow && observe(val);\n    Object.defineProperty(obj, key, {\n      enumerable: true,\n      configurable: true,\n      get: function reactiveGetter () {\n        var value = getter ? getter.call(obj) : val;\n        if (Dep.target) {\n          dep.depend();\n          if (childOb) {\n            childOb.dep.depend();\n            if (Array.isArray(value)) {\n              dependArray(value);\n            }\n          }\n        }\n        return value\n      },\n      set: function reactiveSetter (newVal) {\n        var value = getter ? getter.call(obj) : val;\n        /* eslint-disable no-self-compare */\n        if (newVal === value || (newVal !== newVal && value !== value)) {\n          return\n        }\n        /* eslint-enable no-self-compare */\n        if (customSetter) {\n          customSetter();\n        }\n        // #7981: for accessor properties without setter\n        if (getter && !setter) { return }\n        if (setter) {\n          setter.call(obj, newVal);\n        } else {\n          val = newVal;\n        }\n        childOb = !shallow && observe(newVal);\n        dep.notify();\n      }\n    });\n  }\n\n  /**\n   * Set a property on an object. Adds the new property and\n   * triggers change notification if the property doesn't\n   * already exist.\n   */\n  function set (target, key, val) {\n    if (isUndef(target) || isPrimitive(target)\n    ) {\n      warn((\"Cannot set reactive property on undefined, null, or primitive value: \" + ((target))));\n    }\n    if (Array.isArray(target) && isValidArrayIndex(key)) {\n      target.length = Math.max(target.length, key);\n      target.splice(key, 1, val);\n      return val\n    }\n    if (key in target && !(key in Object.prototype)) {\n      target[key] = val;\n      return val\n    }\n    var ob = (target).__ob__;\n    if (target._isVue || (ob && ob.vmCount)) {\n      warn(\n        'Avoid adding reactive properties to a Vue instance or its root $data ' +\n        'at runtime - declare it upfront in the data option.'\n      );\n      return val\n    }\n    if (!ob) {\n      target[key] = val;\n      return val\n    }\n    defineReactive$$1(ob.value, key, val);\n    ob.dep.notify();\n    return val\n  }\n\n  /**\n   * Delete a property and trigger change if necessary.\n   */\n  function del (target, key) {\n    if (isUndef(target) || isPrimitive(target)\n    ) {\n      warn((\"Cannot delete reactive property on undefined, null, or primitive value: \" + ((target))));\n    }\n    if (Array.isArray(target) && isValidArrayIndex(key)) {\n      target.splice(key, 1);\n      return\n    }\n    var ob = (target).__ob__;\n    if (target._isVue || (ob && ob.vmCount)) {\n      warn(\n        'Avoid deleting properties on a Vue instance or its root $data ' +\n        '- just set it to null.'\n      );\n      return\n    }\n    if (!hasOwn(target, key)) {\n      return\n    }\n    delete target[key];\n    if (!ob) {\n      return\n    }\n    ob.dep.notify();\n  }\n\n  /**\n   * Collect dependencies on array elements when the array is touched, since\n   * we cannot intercept array element access like property getters.\n   */\n  function dependArray (value) {\n    for (var e = (void 0), i = 0, l = value.length; i < l; i++) {\n      e = value[i];\n      e && e.__ob__ && e.__ob__.dep.depend();\n      if (Array.isArray(e)) {\n        dependArray(e);\n      }\n    }\n  }\n\n  /*  */\n\n  /**\n   * Option overwriting strategies are functions that handle\n   * how to merge a parent option value and a child option\n   * value into the final value.\n   */\n  var strats = config.optionMergeStrategies;\n\n  /**\n   * Options with restrictions\n   */\n  {\n    strats.el = strats.propsData = function (parent, child, vm, key) {\n      if (!vm) {\n        warn(\n          \"option \\\"\" + key + \"\\\" can only be used during instance \" +\n          'creation with the `new` keyword.'\n        );\n      }\n      return defaultStrat(parent, child)\n    };\n  }\n\n  /**\n   * Helper that recursively merges two data objects together.\n   */\n  function mergeData (to, from) {\n    if (!from) { return to }\n    var key, toVal, fromVal;\n    var keys = Object.keys(from);\n    for (var i = 0; i < keys.length; i++) {\n      key = keys[i];\n      toVal = to[key];\n      fromVal = from[key];\n      if (!hasOwn(to, key)) {\n        set(to, key, fromVal);\n      } else if (\n        toVal !== fromVal &&\n        isPlainObject(toVal) &&\n        isPlainObject(fromVal)\n      ) {\n        mergeData(toVal, fromVal);\n      }\n    }\n    return to\n  }\n\n  /**\n   * Data\n   */\n  function mergeDataOrFn (\n    parentVal,\n    childVal,\n    vm\n  ) {\n    if (!vm) {\n      // in a Vue.extend merge, both should be functions\n      if (!childVal) {\n        return parentVal\n      }\n      if (!parentVal) {\n        return childVal\n      }\n      // when parentVal & childVal are both present,\n      // we need to return a function that returns the\n      // merged result of both functions... no need to\n      // check if parentVal is a function here because\n      // it has to be a function to pass previous merges.\n      return function mergedDataFn () {\n        return mergeData(\n          typeof childVal === 'function' ? childVal.call(this, this) : childVal,\n          typeof parentVal === 'function' ? parentVal.call(this, this) : parentVal\n        )\n      }\n    } else {\n      return function mergedInstanceDataFn () {\n        // instance merge\n        var instanceData = typeof childVal === 'function'\n          ? childVal.call(vm, vm)\n          : childVal;\n        var defaultData = typeof parentVal === 'function'\n          ? parentVal.call(vm, vm)\n          : parentVal;\n        if (instanceData) {\n          return mergeData(instanceData, defaultData)\n        } else {\n          return defaultData\n        }\n      }\n    }\n  }\n\n  strats.data = function (\n    parentVal,\n    childVal,\n    vm\n  ) {\n    if (!vm) {\n      if (childVal && typeof childVal !== 'function') {\n        warn(\n          'The \"data\" option should be a function ' +\n          'that returns a per-instance value in component ' +\n          'definitions.',\n          vm\n        );\n\n        return parentVal\n      }\n      return mergeDataOrFn(parentVal, childVal)\n    }\n\n    return mergeDataOrFn(parentVal, childVal, vm)\n  };\n\n  /**\n   * Hooks and props are merged as arrays.\n   */\n  function mergeHook (\n    parentVal,\n    childVal\n  ) {\n    var res = childVal\n      ? parentVal\n        ? parentVal.concat(childVal)\n        : Array.isArray(childVal)\n          ? childVal\n          : [childVal]\n      : parentVal;\n    return res\n      ? dedupeHooks(res)\n      : res\n  }\n\n  function dedupeHooks (hooks) {\n    var res = [];\n    for (var i = 0; i < hooks.length; i++) {\n      if (res.indexOf(hooks[i]) === -1) {\n        res.push(hooks[i]);\n      }\n    }\n    return res\n  }\n\n  LIFECYCLE_HOOKS.forEach(function (hook) {\n    strats[hook] = mergeHook;\n  });\n\n  /**\n   * Assets\n   *\n   * When a vm is present (instance creation), we need to do\n   * a three-way merge between constructor options, instance\n   * options and parent options.\n   */\n  function mergeAssets (\n    parentVal,\n    childVal,\n    vm,\n    key\n  ) {\n    var res = Object.create(parentVal || null);\n    if (childVal) {\n      assertObjectType(key, childVal, vm);\n      return extend(res, childVal)\n    } else {\n      return res\n    }\n  }\n\n  ASSET_TYPES.forEach(function (type) {\n    strats[type + 's'] = mergeAssets;\n  });\n\n  /**\n   * Watchers.\n   *\n   * Watchers hashes should not overwrite one\n   * another, so we merge them as arrays.\n   */\n  strats.watch = function (\n    parentVal,\n    childVal,\n    vm,\n    key\n  ) {\n    // work around Firefox's Object.prototype.watch...\n    if (parentVal === nativeWatch) { parentVal = undefined; }\n    if (childVal === nativeWatch) { childVal = undefined; }\n    /* istanbul ignore if */\n    if (!childVal) { return Object.create(parentVal || null) }\n    {\n      assertObjectType(key, childVal, vm);\n    }\n    if (!parentVal) { return childVal }\n    var ret = {};\n    extend(ret, parentVal);\n    for (var key$1 in childVal) {\n      var parent = ret[key$1];\n      var child = childVal[key$1];\n      if (parent && !Array.isArray(parent)) {\n        parent = [parent];\n      }\n      ret[key$1] = parent\n        ? parent.concat(child)\n        : Array.isArray(child) ? child : [child];\n    }\n    return ret\n  };\n\n  /**\n   * Other object hashes.\n   */\n  strats.props =\n  strats.methods =\n  strats.inject =\n  strats.computed = function (\n    parentVal,\n    childVal,\n    vm,\n    key\n  ) {\n    if (childVal && \"development\" !== 'production') {\n      assertObjectType(key, childVal, vm);\n    }\n    if (!parentVal) { return childVal }\n    var ret = Object.create(null);\n    extend(ret, parentVal);\n    if (childVal) { extend(ret, childVal); }\n    return ret\n  };\n  strats.provide = mergeDataOrFn;\n\n  /**\n   * Default strategy.\n   */\n  var defaultStrat = function (parentVal, childVal) {\n    return childVal === undefined\n      ? parentVal\n      : childVal\n  };\n\n  /**\n   * Validate component names\n   */\n  function checkComponents (options) {\n    for (var key in options.components) {\n      validateComponentName(key);\n    }\n  }\n\n  function validateComponentName (name) {\n    if (!/^[a-zA-Z][\\w-]*$/.test(name)) {\n      warn(\n        'Invalid component name: \"' + name + '\". Component names ' +\n        'can only contain alphanumeric characters and the hyphen, ' +\n        'and must start with a letter.'\n      );\n    }\n    if (isBuiltInTag(name) || config.isReservedTag(name)) {\n      warn(\n        'Do not use built-in or reserved HTML elements as component ' +\n        'id: ' + name\n      );\n    }\n  }\n\n  /**\n   * Ensure all props option syntax are normalized into the\n   * Object-based format.\n   */\n  function normalizeProps (options, vm) {\n    var props = options.props;\n    if (!props) { return }\n    var res = {};\n    var i, val, name;\n    if (Array.isArray(props)) {\n      i = props.length;\n      while (i--) {\n        val = props[i];\n        if (typeof val === 'string') {\n          name = camelize(val);\n          res[name] = { type: null };\n        } else {\n          warn('props must be strings when using array syntax.');\n        }\n      }\n    } else if (isPlainObject(props)) {\n      for (var key in props) {\n        val = props[key];\n        name = camelize(key);\n        res[name] = isPlainObject(val)\n          ? val\n          : { type: val };\n      }\n    } else {\n      warn(\n        \"Invalid value for option \\\"props\\\": expected an Array or an Object, \" +\n        \"but got \" + (toRawType(props)) + \".\",\n        vm\n      );\n    }\n    options.props = res;\n  }\n\n  /**\n   * Normalize all injections into Object-based format\n   */\n  function normalizeInject (options, vm) {\n    var inject = options.inject;\n    if (!inject) { return }\n    var normalized = options.inject = {};\n    if (Array.isArray(inject)) {\n      for (var i = 0; i < inject.length; i++) {\n        normalized[inject[i]] = { from: inject[i] };\n      }\n    } else if (isPlainObject(inject)) {\n      for (var key in inject) {\n        var val = inject[key];\n        normalized[key] = isPlainObject(val)\n          ? extend({ from: key }, val)\n          : { from: val };\n      }\n    } else {\n      warn(\n        \"Invalid value for option \\\"inject\\\": expected an Array or an Object, \" +\n        \"but got \" + (toRawType(inject)) + \".\",\n        vm\n      );\n    }\n  }\n\n  /**\n   * Normalize raw function directives into object format.\n   */\n  function normalizeDirectives (options) {\n    var dirs = options.directives;\n    if (dirs) {\n      for (var key in dirs) {\n        var def = dirs[key];\n        if (typeof def === 'function') {\n          dirs[key] = { bind: def, update: def };\n        }\n      }\n    }\n  }\n\n  function assertObjectType (name, value, vm) {\n    if (!isPlainObject(value)) {\n      warn(\n        \"Invalid value for option \\\"\" + name + \"\\\": expected an Object, \" +\n        \"but got \" + (toRawType(value)) + \".\",\n        vm\n      );\n    }\n  }\n\n  /**\n   * Merge two option objects into a new one.\n   * Core utility used in both instantiation and inheritance.\n   */\n  function mergeOptions (\n    parent,\n    child,\n    vm\n  ) {\n    {\n      checkComponents(child);\n    }\n\n    if (typeof child === 'function') {\n      child = child.options;\n    }\n\n    normalizeProps(child, vm);\n    normalizeInject(child, vm);\n    normalizeDirectives(child);\n\n    // Apply extends and mixins on the child options,\n    // but only if it is a raw options object that isn't\n    // the result of another mergeOptions call.\n    // Only merged options has the _base property.\n    if (!child._base) {\n      if (child.extends) {\n        parent = mergeOptions(parent, child.extends, vm);\n      }\n      if (child.mixins) {\n        for (var i = 0, l = child.mixins.length; i < l; i++) {\n          parent = mergeOptions(parent, child.mixins[i], vm);\n        }\n      }\n    }\n\n    var options = {};\n    var key;\n    for (key in parent) {\n      mergeField(key);\n    }\n    for (key in child) {\n      if (!hasOwn(parent, key)) {\n        mergeField(key);\n      }\n    }\n    function mergeField (key) {\n      var strat = strats[key] || defaultStrat;\n      options[key] = strat(parent[key], child[key], vm, key);\n    }\n    return options\n  }\n\n  /**\n   * Resolve an asset.\n   * This function is used because child instances need access\n   * to assets defined in its ancestor chain.\n   */\n  function resolveAsset (\n    options,\n    type,\n    id,\n    warnMissing\n  ) {\n    /* istanbul ignore if */\n    if (typeof id !== 'string') {\n      return\n    }\n    var assets = options[type];\n    // check local registration variations first\n    if (hasOwn(assets, id)) { return assets[id] }\n    var camelizedId = camelize(id);\n    if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }\n    var PascalCaseId = capitalize(camelizedId);\n    if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }\n    // fallback to prototype chain\n    var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];\n    if (warnMissing && !res) {\n      warn(\n        'Failed to resolve ' + type.slice(0, -1) + ': ' + id,\n        options\n      );\n    }\n    return res\n  }\n\n  /*  */\n\n\n\n  function validateProp (\n    key,\n    propOptions,\n    propsData,\n    vm\n  ) {\n    var prop = propOptions[key];\n    var absent = !hasOwn(propsData, key);\n    var value = propsData[key];\n    // boolean casting\n    var booleanIndex = getTypeIndex(Boolean, prop.type);\n    if (booleanIndex > -1) {\n      if (absent && !hasOwn(prop, 'default')) {\n        value = false;\n      } else if (value === '' || value === hyphenate(key)) {\n        // only cast empty string / same name to boolean if\n        // boolean has higher priority\n        var stringIndex = getTypeIndex(String, prop.type);\n        if (stringIndex < 0 || booleanIndex < stringIndex) {\n          value = true;\n        }\n      }\n    }\n    // check default value\n    if (value === undefined) {\n      value = getPropDefaultValue(vm, prop, key);\n      // since the default value is a fresh copy,\n      // make sure to observe it.\n      var prevShouldObserve = shouldObserve;\n      toggleObserving(true);\n      observe(value);\n      toggleObserving(prevShouldObserve);\n    }\n    {\n      assertProp(prop, key, value, vm, absent);\n    }\n    return value\n  }\n\n  /**\n   * Get the default value of a prop.\n   */\n  function getPropDefaultValue (vm, prop, key) {\n    // no default, return undefined\n    if (!hasOwn(prop, 'default')) {\n      return undefined\n    }\n    var def = prop.default;\n    // warn against non-factory defaults for Object & Array\n    if (isObject(def)) {\n      warn(\n        'Invalid default value for prop \"' + key + '\": ' +\n        'Props with type Object/Array must use a factory function ' +\n        'to return the default value.',\n        vm\n      );\n    }\n    // the raw prop value was also undefined from previous render,\n    // return previous default value to avoid unnecessary watcher trigger\n    if (vm && vm.$options.propsData &&\n      vm.$options.propsData[key] === undefined &&\n      vm._props[key] !== undefined\n    ) {\n      return vm._props[key]\n    }\n    // call factory function for non-Function types\n    // a value is Function if its prototype is function even across different execution context\n    return typeof def === 'function' && getType(prop.type) !== 'Function'\n      ? def.call(vm)\n      : def\n  }\n\n  /**\n   * Assert whether a prop is valid.\n   */\n  function assertProp (\n    prop,\n    name,\n    value,\n    vm,\n    absent\n  ) {\n    if (prop.required && absent) {\n      warn(\n        'Missing required prop: \"' + name + '\"',\n        vm\n      );\n      return\n    }\n    if (value == null && !prop.required) {\n      return\n    }\n    var type = prop.type;\n    var valid = !type || type === true;\n    var expectedTypes = [];\n    if (type) {\n      if (!Array.isArray(type)) {\n        type = [type];\n      }\n      for (var i = 0; i < type.length && !valid; i++) {\n        var assertedType = assertType(value, type[i]);\n        expectedTypes.push(assertedType.expectedType || '');\n        valid = assertedType.valid;\n      }\n    }\n\n    if (!valid) {\n      warn(\n        getInvalidTypeMessage(name, value, expectedTypes),\n        vm\n      );\n      return\n    }\n    var validator = prop.validator;\n    if (validator) {\n      if (!validator(value)) {\n        warn(\n          'Invalid prop: custom validator check failed for prop \"' + name + '\".',\n          vm\n        );\n      }\n    }\n  }\n\n  var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/;\n\n  function assertType (value, type) {\n    var valid;\n    var expectedType = getType(type);\n    if (simpleCheckRE.test(expectedType)) {\n      var t = typeof value;\n      valid = t === expectedType.toLowerCase();\n      // for primitive wrapper objects\n      if (!valid && t === 'object') {\n        valid = value instanceof type;\n      }\n    } else if (expectedType === 'Object') {\n      valid = isPlainObject(value);\n    } else if (expectedType === 'Array') {\n      valid = Array.isArray(value);\n    } else {\n      valid = value instanceof type;\n    }\n    return {\n      valid: valid,\n      expectedType: expectedType\n    }\n  }\n\n  /**\n   * Use function string name to check built-in types,\n   * because a simple equality check will fail when running\n   * across different vms / iframes.\n   */\n  function getType (fn) {\n    var match = fn && fn.toString().match(/^\\s*function (\\w+)/);\n    return match ? match[1] : ''\n  }\n\n  function isSameType (a, b) {\n    return getType(a) === getType(b)\n  }\n\n  function getTypeIndex (type, expectedTypes) {\n    if (!Array.isArray(expectedTypes)) {\n      return isSameType(expectedTypes, type) ? 0 : -1\n    }\n    for (var i = 0, len = expectedTypes.length; i < len; i++) {\n      if (isSameType(expectedTypes[i], type)) {\n        return i\n      }\n    }\n    return -1\n  }\n\n  function getInvalidTypeMessage (name, value, expectedTypes) {\n    var message = \"Invalid prop: type check failed for prop \\\"\" + name + \"\\\".\" +\n      \" Expected \" + (expectedTypes.map(capitalize).join(', '));\n    var expectedType = expectedTypes[0];\n    var receivedType = toRawType(value);\n    var expectedValue = styleValue(value, expectedType);\n    var receivedValue = styleValue(value, receivedType);\n    // check if we need to specify expected value\n    if (expectedTypes.length === 1 &&\n        isExplicable(expectedType) &&\n        !isBoolean(expectedType, receivedType)) {\n      message += \" with value \" + expectedValue;\n    }\n    message += \", got \" + receivedType + \" \";\n    // check if we need to specify received value\n    if (isExplicable(receivedType)) {\n      message += \"with value \" + receivedValue + \".\";\n    }\n    return message\n  }\n\n  function styleValue (value, type) {\n    if (type === 'String') {\n      return (\"\\\"\" + value + \"\\\"\")\n    } else if (type === 'Number') {\n      return (\"\" + (Number(value)))\n    } else {\n      return (\"\" + value)\n    }\n  }\n\n  function isExplicable (value) {\n    var explicitTypes = ['string', 'number', 'boolean'];\n    return explicitTypes.some(function (elem) { return value.toLowerCase() === elem; })\n  }\n\n  function isBoolean () {\n    var args = [], len = arguments.length;\n    while ( len-- ) args[ len ] = arguments[ len ];\n\n    return args.some(function (elem) { return elem.toLowerCase() === 'boolean'; })\n  }\n\n  /*  */\n\n  function handleError (err, vm, info) {\n    if (vm) {\n      var cur = vm;\n      while ((cur = cur.$parent)) {\n        var hooks = cur.$options.errorCaptured;\n        if (hooks) {\n          for (var i = 0; i < hooks.length; i++) {\n            try {\n              var capture = hooks[i].call(cur, err, vm, info) === false;\n              if (capture) { return }\n            } catch (e) {\n              globalHandleError(e, cur, 'errorCaptured hook');\n            }\n          }\n        }\n      }\n    }\n    globalHandleError(err, vm, info);\n  }\n\n  function globalHandleError (err, vm, info) {\n    if (config.errorHandler) {\n      try {\n        return config.errorHandler.call(null, err, vm, info)\n      } catch (e) {\n        logError(e, null, 'config.errorHandler');\n      }\n    }\n    logError(err, vm, info);\n  }\n\n  function logError (err, vm, info) {\n    {\n      warn((\"Error in \" + info + \": \\\"\" + (err.toString()) + \"\\\"\"), vm);\n    }\n    /* istanbul ignore else */\n    if ((inBrowser || inWeex) && typeof console !== 'undefined') {\n      console.error(err);\n    } else {\n      throw err\n    }\n  }\n\n  /*  */\n\n  var callbacks = [];\n  var pending = false;\n\n  function flushCallbacks () {\n    pending = false;\n    var copies = callbacks.slice(0);\n    callbacks.length = 0;\n    for (var i = 0; i < copies.length; i++) {\n      copies[i]();\n    }\n  }\n\n  // Here we have async deferring wrappers using both microtasks and (macro) tasks.\n  // In < 2.4 we used microtasks everywhere, but there are some scenarios where\n  // microtasks have too high a priority and fire in between supposedly\n  // sequential events (e.g. #4521, #6690) or even between bubbling of the same\n  // event (#6566). However, using (macro) tasks everywhere also has subtle problems\n  // when state is changed right before repaint (e.g. #6813, out-in transitions).\n  // Here we use microtask by default, but expose a way to force (macro) task when\n  // needed (e.g. in event handlers attached by v-on).\n  var microTimerFunc;\n  var macroTimerFunc;\n  var useMacroTask = false;\n\n  // Determine (macro) task defer implementation.\n  // Technically setImmediate should be the ideal choice, but it's only available\n  // in IE. The only polyfill that consistently queues the callback after all DOM\n  // events triggered in the same loop is by using MessageChannel.\n  /* istanbul ignore if */\n  if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {\n    macroTimerFunc = function () {\n      setImmediate(flushCallbacks);\n    };\n  } else if (typeof MessageChannel !== 'undefined' && (\n    isNative(MessageChannel) ||\n    // PhantomJS\n    MessageChannel.toString() === '[object MessageChannelConstructor]'\n  )) {\n    var channel = new MessageChannel();\n    var port = channel.port2;\n    channel.port1.onmessage = flushCallbacks;\n    macroTimerFunc = function () {\n      port.postMessage(1);\n    };\n  } else {\n    /* istanbul ignore next */\n    macroTimerFunc = function () {\n      setTimeout(flushCallbacks, 0);\n    };\n  }\n\n  // Determine microtask defer implementation.\n  /* istanbul ignore next, $flow-disable-line */\n  if (typeof Promise !== 'undefined' && isNative(Promise)) {\n    var p = Promise.resolve();\n    microTimerFunc = function () {\n      p.then(flushCallbacks);\n      // in problematic UIWebViews, Promise.then doesn't completely break, but\n      // it can get stuck in a weird state where callbacks are pushed into the\n      // microtask queue but the queue isn't being flushed, until the browser\n      // needs to do some other work, e.g. handle a timer. Therefore we can\n      // \"force\" the microtask queue to be flushed by adding an empty timer.\n      if (isIOS) { setTimeout(noop); }\n    };\n  } else {\n    // fallback to macro\n    microTimerFunc = macroTimerFunc;\n  }\n\n  /**\n   * Wrap a function so that if any code inside triggers state change,\n   * the changes are queued using a (macro) task instead of a microtask.\n   */\n  function withMacroTask (fn) {\n    return fn._withTask || (fn._withTask = function () {\n      useMacroTask = true;\n      try {\n        return fn.apply(null, arguments)\n      } finally {\n        useMacroTask = false;    \n      }\n    })\n  }\n\n  function nextTick (cb, ctx) {\n    var _resolve;\n    callbacks.push(function () {\n      if (cb) {\n        try {\n          cb.call(ctx);\n        } catch (e) {\n          handleError(e, ctx, 'nextTick');\n        }\n      } else if (_resolve) {\n        _resolve(ctx);\n      }\n    });\n    if (!pending) {\n      pending = true;\n      if (useMacroTask) {\n        macroTimerFunc();\n      } else {\n        microTimerFunc();\n      }\n    }\n    // $flow-disable-line\n    if (!cb && typeof Promise !== 'undefined') {\n      return new Promise(function (resolve) {\n        _resolve = resolve;\n      })\n    }\n  }\n\n  /*  */\n\n  var mark;\n  var measure;\n\n  {\n    var perf = inBrowser && window.performance;\n    /* istanbul ignore if */\n    if (\n      perf &&\n      perf.mark &&\n      perf.measure &&\n      perf.clearMarks &&\n      perf.clearMeasures\n    ) {\n      mark = function (tag) { return perf.mark(tag); };\n      measure = function (name, startTag, endTag) {\n        perf.measure(name, startTag, endTag);\n        perf.clearMarks(startTag);\n        perf.clearMarks(endTag);\n        perf.clearMeasures(name);\n      };\n    }\n  }\n\n  /* not type checking this file because flow doesn't play well with Proxy */\n\n  var initProxy;\n\n  {\n    var allowedGlobals = makeMap(\n      'Infinity,undefined,NaN,isFinite,isNaN,' +\n      'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +\n      'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +\n      'require' // for Webpack/Browserify\n    );\n\n    var warnNonPresent = function (target, key) {\n      warn(\n        \"Property or method \\\"\" + key + \"\\\" is not defined on the instance but \" +\n        'referenced during render. Make sure that this property is reactive, ' +\n        'either in the data option, or for class-based components, by ' +\n        'initializing the property. ' +\n        'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',\n        target\n      );\n    };\n\n    var warnReservedPrefix = function (target, key) {\n      warn(\n        \"Property \\\"\" + key + \"\\\" must be accessed with \\\"$data.\" + key + \"\\\" because \" +\n        'properties starting with \"$\" or \"_\" are not proxied in the Vue instance to ' +\n        'prevent conflicts with Vue internals' +\n        'See: https://vuejs.org/v2/api/#data',\n        target\n      );\n    };\n\n    var hasProxy =\n      typeof Proxy !== 'undefined' && isNative(Proxy);\n\n    if (hasProxy) {\n      var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact');\n      config.keyCodes = new Proxy(config.keyCodes, {\n        set: function set (target, key, value) {\n          if (isBuiltInModifier(key)) {\n            warn((\"Avoid overwriting built-in modifier in config.keyCodes: .\" + key));\n            return false\n          } else {\n            target[key] = value;\n            return true\n          }\n        }\n      });\n    }\n\n    var hasHandler = {\n      has: function has (target, key) {\n        var has = key in target;\n        var isAllowed = allowedGlobals(key) ||\n          (typeof key === 'string' && key.charAt(0) === '_' && !(key in target.$data));\n        if (!has && !isAllowed) {\n          if (key in target.$data) { warnReservedPrefix(target, key); }\n          else { warnNonPresent(target, key); }\n        }\n        return has || !isAllowed\n      }\n    };\n\n    var getHandler = {\n      get: function get (target, key) {\n        if (typeof key === 'string' && !(key in target)) {\n          if (key in target.$data) { warnReservedPrefix(target, key); }\n          else { warnNonPresent(target, key); }\n        }\n        return target[key]\n      }\n    };\n\n    initProxy = function initProxy (vm) {\n      if (hasProxy) {\n        // determine which proxy handler to use\n        var options = vm.$options;\n        var handlers = options.render && options.render._withStripped\n          ? getHandler\n          : hasHandler;\n        vm._renderProxy = new Proxy(vm, handlers);\n      } else {\n        vm._renderProxy = vm;\n      }\n    };\n  }\n\n  /*  */\n\n  var seenObjects = new _Set();\n\n  /**\n   * Recursively traverse an object to evoke all converted\n   * getters, so that every nested property inside the object\n   * is collected as a \"deep\" dependency.\n   */\n  function traverse (val) {\n    _traverse(val, seenObjects);\n    seenObjects.clear();\n  }\n\n  function _traverse (val, seen) {\n    var i, keys;\n    var isA = Array.isArray(val);\n    if ((!isA && !isObject(val)) || Object.isFrozen(val) || val instanceof VNode) {\n      return\n    }\n    if (val.__ob__) {\n      var depId = val.__ob__.dep.id;\n      if (seen.has(depId)) {\n        return\n      }\n      seen.add(depId);\n    }\n    if (isA) {\n      i = val.length;\n      while (i--) { _traverse(val[i], seen); }\n    } else {\n      keys = Object.keys(val);\n      i = keys.length;\n      while (i--) { _traverse(val[keys[i]], seen); }\n    }\n  }\n\n  /*  */\n\n  var normalizeEvent = cached(function (name) {\n    var passive = name.charAt(0) === '&';\n    name = passive ? name.slice(1) : name;\n    var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first\n    name = once$$1 ? name.slice(1) : name;\n    var capture = name.charAt(0) === '!';\n    name = capture ? name.slice(1) : name;\n    return {\n      name: name,\n      once: once$$1,\n      capture: capture,\n      passive: passive\n    }\n  });\n\n  function createFnInvoker (fns) {\n    function invoker () {\n      var arguments$1 = arguments;\n\n      var fns = invoker.fns;\n      if (Array.isArray(fns)) {\n        var cloned = fns.slice();\n        for (var i = 0; i < cloned.length; i++) {\n          cloned[i].apply(null, arguments$1);\n        }\n      } else {\n        // return handler return value for single handlers\n        return fns.apply(null, arguments)\n      }\n    }\n    invoker.fns = fns;\n    return invoker\n  }\n\n  function updateListeners (\n    on,\n    oldOn,\n    add,\n    remove$$1,\n    createOnceHandler,\n    vm\n  ) {\n    var name, def$$1, cur, old, event;\n    for (name in on) {\n      def$$1 = cur = on[name];\n      old = oldOn[name];\n      event = normalizeEvent(name);\n      if (isUndef(cur)) {\n        warn(\n          \"Invalid handler for event \\\"\" + (event.name) + \"\\\": got \" + String(cur),\n          vm\n        );\n      } else if (isUndef(old)) {\n        if (isUndef(cur.fns)) {\n          cur = on[name] = createFnInvoker(cur);\n        }\n        if (isTrue(event.once)) {\n          cur = on[name] = createOnceHandler(event.name, cur, event.capture);\n        }\n        add(event.name, cur, event.capture, event.passive, event.params);\n      } else if (cur !== old) {\n        old.fns = cur;\n        on[name] = old;\n      }\n    }\n    for (name in oldOn) {\n      if (isUndef(on[name])) {\n        event = normalizeEvent(name);\n        remove$$1(event.name, oldOn[name], event.capture);\n      }\n    }\n  }\n\n  /*  */\n\n  function mergeVNodeHook (def, hookKey, hook) {\n    if (def instanceof VNode) {\n      def = def.data.hook || (def.data.hook = {});\n    }\n    var invoker;\n    var oldHook = def[hookKey];\n\n    function wrappedHook () {\n      hook.apply(this, arguments);\n      // important: remove merged hook to ensure it's called only once\n      // and prevent memory leak\n      remove(invoker.fns, wrappedHook);\n    }\n\n    if (isUndef(oldHook)) {\n      // no existing hook\n      invoker = createFnInvoker([wrappedHook]);\n    } else {\n      /* istanbul ignore if */\n      if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {\n        // already a merged invoker\n        invoker = oldHook;\n        invoker.fns.push(wrappedHook);\n      } else {\n        // existing plain hook\n        invoker = createFnInvoker([oldHook, wrappedHook]);\n      }\n    }\n\n    invoker.merged = true;\n    def[hookKey] = invoker;\n  }\n\n  /*  */\n\n  function extractPropsFromVNodeData (\n    data,\n    Ctor,\n    tag\n  ) {\n    // we are only extracting raw values here.\n    // validation and default values are handled in the child\n    // component itself.\n    var propOptions = Ctor.options.props;\n    if (isUndef(propOptions)) {\n      return\n    }\n    var res = {};\n    var attrs = data.attrs;\n    var props = data.props;\n    if (isDef(attrs) || isDef(props)) {\n      for (var key in propOptions) {\n        var altKey = hyphenate(key);\n        {\n          var keyInLowerCase = key.toLowerCase();\n          if (\n            key !== keyInLowerCase &&\n            attrs && hasOwn(attrs, keyInLowerCase)\n          ) {\n            tip(\n              \"Prop \\\"\" + keyInLowerCase + \"\\\" is passed to component \" +\n              (formatComponentName(tag || Ctor)) + \", but the declared prop name is\" +\n              \" \\\"\" + key + \"\\\". \" +\n              \"Note that HTML attributes are case-insensitive and camelCased \" +\n              \"props need to use their kebab-case equivalents when using in-DOM \" +\n              \"templates. You should probably use \\\"\" + altKey + \"\\\" instead of \\\"\" + key + \"\\\".\"\n            );\n          }\n        }\n        checkProp(res, props, key, altKey, true) ||\n        checkProp(res, attrs, key, altKey, false);\n      }\n    }\n    return res\n  }\n\n  function checkProp (\n    res,\n    hash,\n    key,\n    altKey,\n    preserve\n  ) {\n    if (isDef(hash)) {\n      if (hasOwn(hash, key)) {\n        res[key] = hash[key];\n        if (!preserve) {\n          delete hash[key];\n        }\n        return true\n      } else if (hasOwn(hash, altKey)) {\n        res[key] = hash[altKey];\n        if (!preserve) {\n          delete hash[altKey];\n        }\n        return true\n      }\n    }\n    return false\n  }\n\n  /*  */\n\n  // The template compiler attempts to minimize the need for normalization by\n  // statically analyzing the template at compile time.\n  //\n  // For plain HTML markup, normalization can be completely skipped because the\n  // generated render function is guaranteed to return Array<VNode>. There are\n  // two cases where extra normalization is needed:\n\n  // 1. When the children contains components - because a functional component\n  // may return an Array instead of a single root. In this case, just a simple\n  // normalization is needed - if any child is an Array, we flatten the whole\n  // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep\n  // because functional components already normalize their own children.\n  function simpleNormalizeChildren (children) {\n    for (var i = 0; i < children.length; i++) {\n      if (Array.isArray(children[i])) {\n        return Array.prototype.concat.apply([], children)\n      }\n    }\n    return children\n  }\n\n  // 2. When the children contains constructs that always generated nested Arrays,\n  // e.g. <template>, <slot>, v-for, or when the children is provided by user\n  // with hand-written render functions / JSX. In such cases a full normalization\n  // is needed to cater to all possible types of children values.\n  function normalizeChildren (children) {\n    return isPrimitive(children)\n      ? [createTextVNode(children)]\n      : Array.isArray(children)\n        ? normalizeArrayChildren(children)\n        : undefined\n  }\n\n  function isTextNode (node) {\n    return isDef(node) && isDef(node.text) && isFalse(node.isComment)\n  }\n\n  function normalizeArrayChildren (children, nestedIndex) {\n    var res = [];\n    var i, c, lastIndex, last;\n    for (i = 0; i < children.length; i++) {\n      c = children[i];\n      if (isUndef(c) || typeof c === 'boolean') { continue }\n      lastIndex = res.length - 1;\n      last = res[lastIndex];\n      //  nested\n      if (Array.isArray(c)) {\n        if (c.length > 0) {\n          c = normalizeArrayChildren(c, ((nestedIndex || '') + \"_\" + i));\n          // merge adjacent text nodes\n          if (isTextNode(c[0]) && isTextNode(last)) {\n            res[lastIndex] = createTextVNode(last.text + (c[0]).text);\n            c.shift();\n          }\n          res.push.apply(res, c);\n        }\n      } else if (isPrimitive(c)) {\n        if (isTextNode(last)) {\n          // merge adjacent text nodes\n          // this is necessary for SSR hydration because text nodes are\n          // essentially merged when rendered to HTML strings\n          res[lastIndex] = createTextVNode(last.text + c);\n        } else if (c !== '') {\n          // convert primitive to vnode\n          res.push(createTextVNode(c));\n        }\n      } else {\n        if (isTextNode(c) && isTextNode(last)) {\n          // merge adjacent text nodes\n          res[lastIndex] = createTextVNode(last.text + c.text);\n        } else {\n          // default key for nested array children (likely generated by v-for)\n          if (isTrue(children._isVList) &&\n            isDef(c.tag) &&\n            isUndef(c.key) &&\n            isDef(nestedIndex)) {\n            c.key = \"__vlist\" + nestedIndex + \"_\" + i + \"__\";\n          }\n          res.push(c);\n        }\n      }\n    }\n    return res\n  }\n\n  /*  */\n\n  function ensureCtor (comp, base) {\n    if (\n      comp.__esModule ||\n      (hasSymbol && comp[Symbol.toStringTag] === 'Module')\n    ) {\n      comp = comp.default;\n    }\n    return isObject(comp)\n      ? base.extend(comp)\n      : comp\n  }\n\n  function createAsyncPlaceholder (\n    factory,\n    data,\n    context,\n    children,\n    tag\n  ) {\n    var node = createEmptyVNode();\n    node.asyncFactory = factory;\n    node.asyncMeta = { data: data, context: context, children: children, tag: tag };\n    return node\n  }\n\n  function resolveAsyncComponent (\n    factory,\n    baseCtor,\n    context\n  ) {\n    if (isTrue(factory.error) && isDef(factory.errorComp)) {\n      return factory.errorComp\n    }\n\n    if (isDef(factory.resolved)) {\n      return factory.resolved\n    }\n\n    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {\n      return factory.loadingComp\n    }\n\n    if (isDef(factory.contexts)) {\n      // already pending\n      factory.contexts.push(context);\n    } else {\n      var contexts = factory.contexts = [context];\n      var sync = true;\n\n      var forceRender = function (renderCompleted) {\n        for (var i = 0, l = contexts.length; i < l; i++) {\n          contexts[i].$forceUpdate();\n        }\n\n        if (renderCompleted) {\n          contexts.length = 0;\n        }\n      };\n\n      var resolve = once(function (res) {\n        // cache resolved\n        factory.resolved = ensureCtor(res, baseCtor);\n        // invoke callbacks only if this is not a synchronous resolve\n        // (async resolves are shimmed as synchronous during SSR)\n        if (!sync) {\n          forceRender(true);\n        } else {\n          contexts.length = 0;\n        }\n      });\n\n      var reject = once(function (reason) {\n        warn(\n          \"Failed to resolve async component: \" + (String(factory)) +\n          (reason ? (\"\\nReason: \" + reason) : '')\n        );\n        if (isDef(factory.errorComp)) {\n          factory.error = true;\n          forceRender(true);\n        }\n      });\n\n      var res = factory(resolve, reject);\n\n      if (isObject(res)) {\n        if (typeof res.then === 'function') {\n          // () => Promise\n          if (isUndef(factory.resolved)) {\n            res.then(resolve, reject);\n          }\n        } else if (isDef(res.component) && typeof res.component.then === 'function') {\n          res.component.then(resolve, reject);\n\n          if (isDef(res.error)) {\n            factory.errorComp = ensureCtor(res.error, baseCtor);\n          }\n\n          if (isDef(res.loading)) {\n            factory.loadingComp = ensureCtor(res.loading, baseCtor);\n            if (res.delay === 0) {\n              factory.loading = true;\n            } else {\n              setTimeout(function () {\n                if (isUndef(factory.resolved) && isUndef(factory.error)) {\n                  factory.loading = true;\n                  forceRender(false);\n                }\n              }, res.delay || 200);\n            }\n          }\n\n          if (isDef(res.timeout)) {\n            setTimeout(function () {\n              if (isUndef(factory.resolved)) {\n                reject(\n                  \"timeout (\" + (res.timeout) + \"ms)\"\n                );\n              }\n            }, res.timeout);\n          }\n        }\n      }\n\n      sync = false;\n      // return in case resolved synchronously\n      return factory.loading\n        ? factory.loadingComp\n        : factory.resolved\n    }\n  }\n\n  /*  */\n\n  function isAsyncPlaceholder (node) {\n    return node.isComment && node.asyncFactory\n  }\n\n  /*  */\n\n  function getFirstComponentChild (children) {\n    if (Array.isArray(children)) {\n      for (var i = 0; i < children.length; i++) {\n        var c = children[i];\n        if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {\n          return c\n        }\n      }\n    }\n  }\n\n  /*  */\n\n  /*  */\n\n  function initEvents (vm) {\n    vm._events = Object.create(null);\n    vm._hasHookEvent = false;\n    // init parent attached events\n    var listeners = vm.$options._parentListeners;\n    if (listeners) {\n      updateComponentListeners(vm, listeners);\n    }\n  }\n\n  var target;\n\n  function add (event, fn) {\n    target.$on(event, fn);\n  }\n\n  function remove$1 (event, fn) {\n    target.$off(event, fn);\n  }\n\n  function createOnceHandler (event, fn) {\n    var _target = target;\n    return function onceHandler () {\n      var res = fn.apply(null, arguments);\n      if (res !== null) {\n        _target.$off(event, onceHandler);\n      }\n    }\n  }\n\n  function updateComponentListeners (\n    vm,\n    listeners,\n    oldListeners\n  ) {\n    target = vm;\n    updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);\n    target = undefined;\n  }\n\n  function eventsMixin (Vue) {\n    var hookRE = /^hook:/;\n    Vue.prototype.$on = function (event, fn) {\n      var vm = this;\n      if (Array.isArray(event)) {\n        for (var i = 0, l = event.length; i < l; i++) {\n          vm.$on(event[i], fn);\n        }\n      } else {\n        (vm._events[event] || (vm._events[event] = [])).push(fn);\n        // optimize hook:event cost by using a boolean flag marked at registration\n        // instead of a hash lookup\n        if (hookRE.test(event)) {\n          vm._hasHookEvent = true;\n        }\n      }\n      return vm\n    };\n\n    Vue.prototype.$once = function (event, fn) {\n      var vm = this;\n      function on () {\n        vm.$off(event, on);\n        fn.apply(vm, arguments);\n      }\n      on.fn = fn;\n      vm.$on(event, on);\n      return vm\n    };\n\n    Vue.prototype.$off = function (event, fn) {\n      var vm = this;\n      // all\n      if (!arguments.length) {\n        vm._events = Object.create(null);\n        return vm\n      }\n      // array of events\n      if (Array.isArray(event)) {\n        for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {\n          vm.$off(event[i$1], fn);\n        }\n        return vm\n      }\n      // specific event\n      var cbs = vm._events[event];\n      if (!cbs) {\n        return vm\n      }\n      if (!fn) {\n        vm._events[event] = null;\n        return vm\n      }\n      // specific handler\n      var cb;\n      var i = cbs.length;\n      while (i--) {\n        cb = cbs[i];\n        if (cb === fn || cb.fn === fn) {\n          cbs.splice(i, 1);\n          break\n        }\n      }\n      return vm\n    };\n\n    Vue.prototype.$emit = function (event) {\n      var vm = this;\n      {\n        var lowerCaseEvent = event.toLowerCase();\n        if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {\n          tip(\n            \"Event \\\"\" + lowerCaseEvent + \"\\\" is emitted in component \" +\n            (formatComponentName(vm)) + \" but the handler is registered for \\\"\" + event + \"\\\". \" +\n            \"Note that HTML attributes are case-insensitive and you cannot use \" +\n            \"v-on to listen to camelCase events when using in-DOM templates. \" +\n            \"You should probably use \\\"\" + (hyphenate(event)) + \"\\\" instead of \\\"\" + event + \"\\\".\"\n          );\n        }\n      }\n      var cbs = vm._events[event];\n      if (cbs) {\n        cbs = cbs.length > 1 ? toArray(cbs) : cbs;\n        var args = toArray(arguments, 1);\n        for (var i = 0, l = cbs.length; i < l; i++) {\n          try {\n            cbs[i].apply(vm, args);\n          } catch (e) {\n            handleError(e, vm, (\"event handler for \\\"\" + event + \"\\\"\"));\n          }\n        }\n      }\n      return vm\n    };\n  }\n\n  /*  */\n\n\n\n  /**\n   * Runtime helper for resolving raw children VNodes into a slot object.\n   */\n  function resolveSlots (\n    children,\n    context\n  ) {\n    var slots = {};\n    if (!children) {\n      return slots\n    }\n    for (var i = 0, l = children.length; i < l; i++) {\n      var child = children[i];\n      var data = child.data;\n      // remove slot attribute if the node is resolved as a Vue slot node\n      if (data && data.attrs && data.attrs.slot) {\n        delete data.attrs.slot;\n      }\n      // named slots should only be respected if the vnode was rendered in the\n      // same context.\n      if ((child.context === context || child.fnContext === context) &&\n        data && data.slot != null\n      ) {\n        var name = data.slot;\n        var slot = (slots[name] || (slots[name] = []));\n        if (child.tag === 'template') {\n          slot.push.apply(slot, child.children || []);\n        } else {\n          slot.push(child);\n        }\n      } else {\n        (slots.default || (slots.default = [])).push(child);\n      }\n    }\n    // ignore slots that contains only whitespace\n    for (var name$1 in slots) {\n      if (slots[name$1].every(isWhitespace)) {\n        delete slots[name$1];\n      }\n    }\n    return slots\n  }\n\n  function isWhitespace (node) {\n    return (node.isComment && !node.asyncFactory) || node.text === ' '\n  }\n\n  function resolveScopedSlots (\n    fns, // see flow/vnode\n    res\n  ) {\n    res = res || {};\n    for (var i = 0; i < fns.length; i++) {\n      if (Array.isArray(fns[i])) {\n        resolveScopedSlots(fns[i], res);\n      } else {\n        res[fns[i].key] = fns[i].fn;\n      }\n    }\n    return res\n  }\n\n  /*  */\n\n  var activeInstance = null;\n  var isUpdatingChildComponent = false;\n\n  function setActiveInstance(vm) {\n    var prevActiveInstance = activeInstance;\n    activeInstance = vm;\n    return function () {\n      activeInstance = prevActiveInstance;\n    }\n  }\n\n  function initLifecycle (vm) {\n    var options = vm.$options;\n\n    // locate first non-abstract parent\n    var parent = options.parent;\n    if (parent && !options.abstract) {\n      while (parent.$options.abstract && parent.$parent) {\n        parent = parent.$parent;\n      }\n      parent.$children.push(vm);\n    }\n\n    vm.$parent = parent;\n    vm.$root = parent ? parent.$root : vm;\n\n    vm.$children = [];\n    vm.$refs = {};\n\n    vm._watcher = null;\n    vm._inactive = null;\n    vm._directInactive = false;\n    vm._isMounted = false;\n    vm._isDestroyed = false;\n    vm._isBeingDestroyed = false;\n  }\n\n  function lifecycleMixin (Vue) {\n    Vue.prototype._update = function (vnode, hydrating) {\n      var vm = this;\n      var prevEl = vm.$el;\n      var prevVnode = vm._vnode;\n      var restoreActiveInstance = setActiveInstance(vm);\n      vm._vnode = vnode;\n      // Vue.prototype.__patch__ is injected in entry points\n      // based on the rendering backend used.\n      if (!prevVnode) {\n        // initial render\n        vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);\n      } else {\n        // updates\n        vm.$el = vm.__patch__(prevVnode, vnode);\n      }\n      restoreActiveInstance();\n      // update __vue__ reference\n      if (prevEl) {\n        prevEl.__vue__ = null;\n      }\n      if (vm.$el) {\n        vm.$el.__vue__ = vm;\n      }\n      // if parent is an HOC, update its $el as well\n      if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {\n        vm.$parent.$el = vm.$el;\n      }\n      // updated hook is called by the scheduler to ensure that children are\n      // updated in a parent's updated hook.\n    };\n\n    Vue.prototype.$forceUpdate = function () {\n      var vm = this;\n      if (vm._watcher) {\n        vm._watcher.update();\n      }\n    };\n\n    Vue.prototype.$destroy = function () {\n      var vm = this;\n      if (vm._isBeingDestroyed) {\n        return\n      }\n      callHook(vm, 'beforeDestroy');\n      vm._isBeingDestroyed = true;\n      // remove self from parent\n      var parent = vm.$parent;\n      if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {\n        remove(parent.$children, vm);\n      }\n      // teardown watchers\n      if (vm._watcher) {\n        vm._watcher.teardown();\n      }\n      var i = vm._watchers.length;\n      while (i--) {\n        vm._watchers[i].teardown();\n      }\n      // remove reference from data ob\n      // frozen object may not have observer.\n      if (vm._data.__ob__) {\n        vm._data.__ob__.vmCount--;\n      }\n      // call the last hook...\n      vm._isDestroyed = true;\n      // invoke destroy hooks on current rendered tree\n      vm.__patch__(vm._vnode, null);\n      // fire destroyed hook\n      callHook(vm, 'destroyed');\n      // turn off all instance listeners.\n      vm.$off();\n      // remove __vue__ reference\n      if (vm.$el) {\n        vm.$el.__vue__ = null;\n      }\n      // release circular reference (#6759)\n      if (vm.$vnode) {\n        vm.$vnode.parent = null;\n      }\n    };\n  }\n\n  function mountComponent (\n    vm,\n    el,\n    hydrating\n  ) {\n    vm.$el = el;\n    if (!vm.$options.render) {\n      vm.$options.render = createEmptyVNode;\n      {\n        /* istanbul ignore if */\n        if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||\n          vm.$options.el || el) {\n          warn(\n            'You are using the runtime-only build of Vue where the template ' +\n            'compiler is not available. Either pre-compile the templates into ' +\n            'render functions, or use the compiler-included build.',\n            vm\n          );\n        } else {\n          warn(\n            'Failed to mount component: template or render function not defined.',\n            vm\n          );\n        }\n      }\n    }\n    callHook(vm, 'beforeMount');\n\n    var updateComponent;\n    /* istanbul ignore if */\n    if (config.performance && mark) {\n      updateComponent = function () {\n        var name = vm._name;\n        var id = vm._uid;\n        var startTag = \"vue-perf-start:\" + id;\n        var endTag = \"vue-perf-end:\" + id;\n\n        mark(startTag);\n        var vnode = vm._render();\n        mark(endTag);\n        measure((\"vue \" + name + \" render\"), startTag, endTag);\n\n        mark(startTag);\n        vm._update(vnode, hydrating);\n        mark(endTag);\n        measure((\"vue \" + name + \" patch\"), startTag, endTag);\n      };\n    } else {\n      updateComponent = function () {\n        vm._update(vm._render(), hydrating);\n      };\n    }\n\n    // we set this to vm._watcher inside the watcher's constructor\n    // since the watcher's initial patch may call $forceUpdate (e.g. inside child\n    // component's mounted hook), which relies on vm._watcher being already defined\n    new Watcher(vm, updateComponent, noop, {\n      before: function before () {\n        if (vm._isMounted && !vm._isDestroyed) {\n          callHook(vm, 'beforeUpdate');\n        }\n      }\n    }, true /* isRenderWatcher */);\n    hydrating = false;\n\n    // manually mounted instance, call mounted on self\n    // mounted is called for render-created child components in its inserted hook\n    if (vm.$vnode == null) {\n      vm._isMounted = true;\n      callHook(vm, 'mounted');\n    }\n    return vm\n  }\n\n  function updateChildComponent (\n    vm,\n    propsData,\n    listeners,\n    parentVnode,\n    renderChildren\n  ) {\n    {\n      isUpdatingChildComponent = true;\n    }\n\n    // determine whether component has slot children\n    // we need to do this before overwriting $options._renderChildren\n    var hasChildren = !!(\n      renderChildren ||               // has new static slots\n      vm.$options._renderChildren ||  // has old static slots\n      parentVnode.data.scopedSlots || // has new scoped slots\n      vm.$scopedSlots !== emptyObject // has old scoped slots\n    );\n\n    vm.$options._parentVnode = parentVnode;\n    vm.$vnode = parentVnode; // update vm's placeholder node without re-render\n\n    if (vm._vnode) { // update child tree's parent\n      vm._vnode.parent = parentVnode;\n    }\n    vm.$options._renderChildren = renderChildren;\n\n    // update $attrs and $listeners hash\n    // these are also reactive so they may trigger child update if the child\n    // used them during render\n    vm.$attrs = parentVnode.data.attrs || emptyObject;\n    vm.$listeners = listeners || emptyObject;\n\n    // update props\n    if (propsData && vm.$options.props) {\n      toggleObserving(false);\n      var props = vm._props;\n      var propKeys = vm.$options._propKeys || [];\n      for (var i = 0; i < propKeys.length; i++) {\n        var key = propKeys[i];\n        var propOptions = vm.$options.props; // wtf flow?\n        props[key] = validateProp(key, propOptions, propsData, vm);\n      }\n      toggleObserving(true);\n      // keep a copy of raw propsData\n      vm.$options.propsData = propsData;\n    }\n\n    // update listeners\n    listeners = listeners || emptyObject;\n    var oldListeners = vm.$options._parentListeners;\n    vm.$options._parentListeners = listeners;\n    updateComponentListeners(vm, listeners, oldListeners);\n\n    // resolve slots + force update if has children\n    if (hasChildren) {\n      vm.$slots = resolveSlots(renderChildren, parentVnode.context);\n      vm.$forceUpdate();\n    }\n\n    {\n      isUpdatingChildComponent = false;\n    }\n  }\n\n  function isInInactiveTree (vm) {\n    while (vm && (vm = vm.$parent)) {\n      if (vm._inactive) { return true }\n    }\n    return false\n  }\n\n  function activateChildComponent (vm, direct) {\n    if (direct) {\n      vm._directInactive = false;\n      if (isInInactiveTree(vm)) {\n        return\n      }\n    } else if (vm._directInactive) {\n      return\n    }\n    if (vm._inactive || vm._inactive === null) {\n      vm._inactive = false;\n      for (var i = 0; i < vm.$children.length; i++) {\n        activateChildComponent(vm.$children[i]);\n      }\n      callHook(vm, 'activated');\n    }\n  }\n\n  function deactivateChildComponent (vm, direct) {\n    if (direct) {\n      vm._directInactive = true;\n      if (isInInactiveTree(vm)) {\n        return\n      }\n    }\n    if (!vm._inactive) {\n      vm._inactive = true;\n      for (var i = 0; i < vm.$children.length; i++) {\n        deactivateChildComponent(vm.$children[i]);\n      }\n      callHook(vm, 'deactivated');\n    }\n  }\n\n  function callHook (vm, hook) {\n    // #7573 disable dep collection when invoking lifecycle hooks\n    pushTarget();\n    var handlers = vm.$options[hook];\n    if (handlers) {\n      for (var i = 0, j = handlers.length; i < j; i++) {\n        try {\n          handlers[i].call(vm);\n        } catch (e) {\n          handleError(e, vm, (hook + \" hook\"));\n        }\n      }\n    }\n    if (vm._hasHookEvent) {\n      vm.$emit('hook:' + hook);\n    }\n    popTarget();\n  }\n\n  /*  */\n\n  var MAX_UPDATE_COUNT = 100;\n\n  var queue = [];\n  var activatedChildren = [];\n  var has = {};\n  var circular = {};\n  var waiting = false;\n  var flushing = false;\n  var index = 0;\n\n  /**\n   * Reset the scheduler's state.\n   */\n  function resetSchedulerState () {\n    index = queue.length = activatedChildren.length = 0;\n    has = {};\n    {\n      circular = {};\n    }\n    waiting = flushing = false;\n  }\n\n  /**\n   * Flush both queues and run the watchers.\n   */\n  function flushSchedulerQueue () {\n    flushing = true;\n    var watcher, id;\n\n    // Sort queue before flush.\n    // This ensures that:\n    // 1. Components are updated from parent to child. (because parent is always\n    //    created before the child)\n    // 2. A component's user watchers are run before its render watcher (because\n    //    user watchers are created before the render watcher)\n    // 3. If a component is destroyed during a parent component's watcher run,\n    //    its watchers can be skipped.\n    queue.sort(function (a, b) { return a.id - b.id; });\n\n    // do not cache length because more watchers might be pushed\n    // as we run existing watchers\n    for (index = 0; index < queue.length; index++) {\n      watcher = queue[index];\n      if (watcher.before) {\n        watcher.before();\n      }\n      id = watcher.id;\n      has[id] = null;\n      watcher.run();\n      // in dev build, check and stop circular updates.\n      if (has[id] != null) {\n        circular[id] = (circular[id] || 0) + 1;\n        if (circular[id] > MAX_UPDATE_COUNT) {\n          warn(\n            'You may have an infinite update loop ' + (\n              watcher.user\n                ? (\"in watcher with expression \\\"\" + (watcher.expression) + \"\\\"\")\n                : \"in a component render function.\"\n            ),\n            watcher.vm\n          );\n          break\n        }\n      }\n    }\n\n    // keep copies of post queues before resetting state\n    var activatedQueue = activatedChildren.slice();\n    var updatedQueue = queue.slice();\n\n    resetSchedulerState();\n\n    // call component updated and activated hooks\n    callActivatedHooks(activatedQueue);\n    callUpdatedHooks(updatedQueue);\n\n    // devtool hook\n    /* istanbul ignore if */\n    if (devtools && config.devtools) {\n      devtools.emit('flush');\n    }\n  }\n\n  function callUpdatedHooks (queue) {\n    var i = queue.length;\n    while (i--) {\n      var watcher = queue[i];\n      var vm = watcher.vm;\n      if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {\n        callHook(vm, 'updated');\n      }\n    }\n  }\n\n  /**\n   * Queue a kept-alive component that was activated during patch.\n   * The queue will be processed after the entire tree has been patched.\n   */\n  function queueActivatedComponent (vm) {\n    // setting _inactive to false here so that a render function can\n    // rely on checking whether it's in an inactive tree (e.g. router-view)\n    vm._inactive = false;\n    activatedChildren.push(vm);\n  }\n\n  function callActivatedHooks (queue) {\n    for (var i = 0; i < queue.length; i++) {\n      queue[i]._inactive = true;\n      activateChildComponent(queue[i], true /* true */);\n    }\n  }\n\n  /**\n   * Push a watcher into the watcher queue.\n   * Jobs with duplicate IDs will be skipped unless it's\n   * pushed when the queue is being flushed.\n   */\n  function queueWatcher (watcher) {\n    var id = watcher.id;\n    if (has[id] == null) {\n      has[id] = true;\n      if (!flushing) {\n        queue.push(watcher);\n      } else {\n        // if already flushing, splice the watcher based on its id\n        // if already past its id, it will be run next immediately.\n        var i = queue.length - 1;\n        while (i > index && queue[i].id > watcher.id) {\n          i--;\n        }\n        queue.splice(i + 1, 0, watcher);\n      }\n      // queue the flush\n      if (!waiting) {\n        waiting = true;\n\n        if (!config.async) {\n          flushSchedulerQueue();\n          return\n        }\n        nextTick(flushSchedulerQueue);\n      }\n    }\n  }\n\n  /*  */\n\n\n\n  var uid$1 = 0;\n\n  /**\n   * A watcher parses an expression, collects dependencies,\n   * and fires callback when the expression value changes.\n   * This is used for both the $watch() api and directives.\n   */\n  var Watcher = function Watcher (\n    vm,\n    expOrFn,\n    cb,\n    options,\n    isRenderWatcher\n  ) {\n    this.vm = vm;\n    if (isRenderWatcher) {\n      vm._watcher = this;\n    }\n    vm._watchers.push(this);\n    // options\n    if (options) {\n      this.deep = !!options.deep;\n      this.user = !!options.user;\n      this.lazy = !!options.lazy;\n      this.sync = !!options.sync;\n      this.before = options.before;\n    } else {\n      this.deep = this.user = this.lazy = this.sync = false;\n    }\n    this.cb = cb;\n    this.id = ++uid$1; // uid for batching\n    this.active = true;\n    this.dirty = this.lazy; // for lazy watchers\n    this.deps = [];\n    this.newDeps = [];\n    this.depIds = new _Set();\n    this.newDepIds = new _Set();\n    this.expression = expOrFn.toString();\n    // parse expression for getter\n    if (typeof expOrFn === 'function') {\n      this.getter = expOrFn;\n    } else {\n      this.getter = parsePath(expOrFn);\n      if (!this.getter) {\n        this.getter = noop;\n        warn(\n          \"Failed watching path: \\\"\" + expOrFn + \"\\\" \" +\n          'Watcher only accepts simple dot-delimited paths. ' +\n          'For full control, use a function instead.',\n          vm\n        );\n      }\n    }\n    this.value = this.lazy\n      ? undefined\n      : this.get();\n  };\n\n  /**\n   * Evaluate the getter, and re-collect dependencies.\n   */\n  Watcher.prototype.get = function get () {\n    pushTarget(this);\n    var value;\n    var vm = this.vm;\n    try {\n      value = this.getter.call(vm, vm);\n    } catch (e) {\n      if (this.user) {\n        handleError(e, vm, (\"getter for watcher \\\"\" + (this.expression) + \"\\\"\"));\n      } else {\n        throw e\n      }\n    } finally {\n      // \"touch\" every property so they are all tracked as\n      // dependencies for deep watching\n      if (this.deep) {\n        traverse(value);\n      }\n      popTarget();\n      this.cleanupDeps();\n    }\n    return value\n  };\n\n  /**\n   * Add a dependency to this directive.\n   */\n  Watcher.prototype.addDep = function addDep (dep) {\n    var id = dep.id;\n    if (!this.newDepIds.has(id)) {\n      this.newDepIds.add(id);\n      this.newDeps.push(dep);\n      if (!this.depIds.has(id)) {\n        dep.addSub(this);\n      }\n    }\n  };\n\n  /**\n   * Clean up for dependency collection.\n   */\n  Watcher.prototype.cleanupDeps = function cleanupDeps () {\n    var i = this.deps.length;\n    while (i--) {\n      var dep = this.deps[i];\n      if (!this.newDepIds.has(dep.id)) {\n        dep.removeSub(this);\n      }\n    }\n    var tmp = this.depIds;\n    this.depIds = this.newDepIds;\n    this.newDepIds = tmp;\n    this.newDepIds.clear();\n    tmp = this.deps;\n    this.deps = this.newDeps;\n    this.newDeps = tmp;\n    this.newDeps.length = 0;\n  };\n\n  /**\n   * Subscriber interface.\n   * Will be called when a dependency changes.\n   */\n  Watcher.prototype.update = function update () {\n    /* istanbul ignore else */\n    if (this.lazy) {\n      this.dirty = true;\n    } else if (this.sync) {\n      this.run();\n    } else {\n      queueWatcher(this);\n    }\n  };\n\n  /**\n   * Scheduler job interface.\n   * Will be called by the scheduler.\n   */\n  Watcher.prototype.run = function run () {\n    if (this.active) {\n      var value = this.get();\n      if (\n        value !== this.value ||\n        // Deep watchers and watchers on Object/Arrays should fire even\n        // when the value is the same, because the value may\n        // have mutated.\n        isObject(value) ||\n        this.deep\n      ) {\n        // set new value\n        var oldValue = this.value;\n        this.value = value;\n        if (this.user) {\n          try {\n            this.cb.call(this.vm, value, oldValue);\n          } catch (e) {\n            handleError(e, this.vm, (\"callback for watcher \\\"\" + (this.expression) + \"\\\"\"));\n          }\n        } else {\n          this.cb.call(this.vm, value, oldValue);\n        }\n      }\n    }\n  };\n\n  /**\n   * Evaluate the value of the watcher.\n   * This only gets called for lazy watchers.\n   */\n  Watcher.prototype.evaluate = function evaluate () {\n    this.value = this.get();\n    this.dirty = false;\n  };\n\n  /**\n   * Depend on all deps collected by this watcher.\n   */\n  Watcher.prototype.depend = function depend () {\n    var i = this.deps.length;\n    while (i--) {\n      this.deps[i].depend();\n    }\n  };\n\n  /**\n   * Remove self from all dependencies' subscriber list.\n   */\n  Watcher.prototype.teardown = function teardown () {\n    if (this.active) {\n      // remove self from vm's watcher list\n      // this is a somewhat expensive operation so we skip it\n      // if the vm is being destroyed.\n      if (!this.vm._isBeingDestroyed) {\n        remove(this.vm._watchers, this);\n      }\n      var i = this.deps.length;\n      while (i--) {\n        this.deps[i].removeSub(this);\n      }\n      this.active = false;\n    }\n  };\n\n  /*  */\n\n  var sharedPropertyDefinition = {\n    enumerable: true,\n    configurable: true,\n    get: noop,\n    set: noop\n  };\n\n  function proxy (target, sourceKey, key) {\n    sharedPropertyDefinition.get = function proxyGetter () {\n      return this[sourceKey][key]\n    };\n    sharedPropertyDefinition.set = function proxySetter (val) {\n      this[sourceKey][key] = val;\n    };\n    Object.defineProperty(target, key, sharedPropertyDefinition);\n  }\n\n  function initState (vm) {\n    vm._watchers = [];\n    var opts = vm.$options;\n    if (opts.props) { initProps(vm, opts.props); }\n    if (opts.methods) { initMethods(vm, opts.methods); }\n    if (opts.data) {\n      initData(vm);\n    } else {\n      observe(vm._data = {}, true /* asRootData */);\n    }\n    if (opts.computed) { initComputed(vm, opts.computed); }\n    if (opts.watch && opts.watch !== nativeWatch) {\n      initWatch(vm, opts.watch);\n    }\n  }\n\n  function initProps (vm, propsOptions) {\n    var propsData = vm.$options.propsData || {};\n    var props = vm._props = {};\n    // cache prop keys so that future props updates can iterate using Array\n    // instead of dynamic object key enumeration.\n    var keys = vm.$options._propKeys = [];\n    var isRoot = !vm.$parent;\n    // root instance props should be converted\n    if (!isRoot) {\n      toggleObserving(false);\n    }\n    var loop = function ( key ) {\n      keys.push(key);\n      var value = validateProp(key, propsOptions, propsData, vm);\n      /* istanbul ignore else */\n      {\n        var hyphenatedKey = hyphenate(key);\n        if (isReservedAttribute(hyphenatedKey) ||\n            config.isReservedAttr(hyphenatedKey)) {\n          warn(\n            (\"\\\"\" + hyphenatedKey + \"\\\" is a reserved attribute and cannot be used as component prop.\"),\n            vm\n          );\n        }\n        defineReactive$$1(props, key, value, function () {\n          if (!isRoot && !isUpdatingChildComponent) {\n            warn(\n              \"Avoid mutating a prop directly since the value will be \" +\n              \"overwritten whenever the parent component re-renders. \" +\n              \"Instead, use a data or computed property based on the prop's \" +\n              \"value. Prop being mutated: \\\"\" + key + \"\\\"\",\n              vm\n            );\n          }\n        });\n      }\n      // static props are already proxied on the component's prototype\n      // during Vue.extend(). We only need to proxy props defined at\n      // instantiation here.\n      if (!(key in vm)) {\n        proxy(vm, \"_props\", key);\n      }\n    };\n\n    for (var key in propsOptions) loop( key );\n    toggleObserving(true);\n  }\n\n  function initData (vm) {\n    var data = vm.$options.data;\n    data = vm._data = typeof data === 'function'\n      ? getData(data, vm)\n      : data || {};\n    if (!isPlainObject(data)) {\n      data = {};\n      warn(\n        'data functions should return an object:\\n' +\n        'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',\n        vm\n      );\n    }\n    // proxy data on instance\n    var keys = Object.keys(data);\n    var props = vm.$options.props;\n    var methods = vm.$options.methods;\n    var i = keys.length;\n    while (i--) {\n      var key = keys[i];\n      {\n        if (methods && hasOwn(methods, key)) {\n          warn(\n            (\"Method \\\"\" + key + \"\\\" has already been defined as a data property.\"),\n            vm\n          );\n        }\n      }\n      if (props && hasOwn(props, key)) {\n        warn(\n          \"The data property \\\"\" + key + \"\\\" is already declared as a prop. \" +\n          \"Use prop default value instead.\",\n          vm\n        );\n      } else if (!isReserved(key)) {\n        proxy(vm, \"_data\", key);\n      }\n    }\n    // observe data\n    observe(data, true /* asRootData */);\n  }\n\n  function getData (data, vm) {\n    // #7573 disable dep collection when invoking data getters\n    pushTarget();\n    try {\n      return data.call(vm, vm)\n    } catch (e) {\n      handleError(e, vm, \"data()\");\n      return {}\n    } finally {\n      popTarget();\n    }\n  }\n\n  var computedWatcherOptions = { lazy: true };\n\n  function initComputed (vm, computed) {\n    // $flow-disable-line\n    var watchers = vm._computedWatchers = Object.create(null);\n    // computed properties are just getters during SSR\n    var isSSR = isServerRendering();\n\n    for (var key in computed) {\n      var userDef = computed[key];\n      var getter = typeof userDef === 'function' ? userDef : userDef.get;\n      if (getter == null) {\n        warn(\n          (\"Getter is missing for computed property \\\"\" + key + \"\\\".\"),\n          vm\n        );\n      }\n\n      if (!isSSR) {\n        // create internal watcher for the computed property.\n        watchers[key] = new Watcher(\n          vm,\n          getter || noop,\n          noop,\n          computedWatcherOptions\n        );\n      }\n\n      // component-defined computed properties are already defined on the\n      // component prototype. We only need to define computed properties defined\n      // at instantiation here.\n      if (!(key in vm)) {\n        defineComputed(vm, key, userDef);\n      } else {\n        if (key in vm.$data) {\n          warn((\"The computed property \\\"\" + key + \"\\\" is already defined in data.\"), vm);\n        } else if (vm.$options.props && key in vm.$options.props) {\n          warn((\"The computed property \\\"\" + key + \"\\\" is already defined as a prop.\"), vm);\n        }\n      }\n    }\n  }\n\n  function defineComputed (\n    target,\n    key,\n    userDef\n  ) {\n    var shouldCache = !isServerRendering();\n    if (typeof userDef === 'function') {\n      sharedPropertyDefinition.get = shouldCache\n        ? createComputedGetter(key)\n        : createGetterInvoker(userDef);\n      sharedPropertyDefinition.set = noop;\n    } else {\n      sharedPropertyDefinition.get = userDef.get\n        ? shouldCache && userDef.cache !== false\n          ? createComputedGetter(key)\n          : createGetterInvoker(userDef.get)\n        : noop;\n      sharedPropertyDefinition.set = userDef.set || noop;\n    }\n    if (sharedPropertyDefinition.set === noop) {\n      sharedPropertyDefinition.set = function () {\n        warn(\n          (\"Computed property \\\"\" + key + \"\\\" was assigned to but it has no setter.\"),\n          this\n        );\n      };\n    }\n    Object.defineProperty(target, key, sharedPropertyDefinition);\n  }\n\n  function createComputedGetter (key) {\n    return function computedGetter () {\n      var watcher = this._computedWatchers && this._computedWatchers[key];\n      if (watcher) {\n        if (watcher.dirty) {\n          watcher.evaluate();\n        }\n        if (Dep.target) {\n          watcher.depend();\n        }\n        return watcher.value\n      }\n    }\n  }\n\n  function createGetterInvoker(fn) {\n    return function computedGetter () {\n      return fn.call(this, this)\n    }\n  }\n\n  function initMethods (vm, methods) {\n    var props = vm.$options.props;\n    for (var key in methods) {\n      {\n        if (typeof methods[key] !== 'function') {\n          warn(\n            \"Method \\\"\" + key + \"\\\" has type \\\"\" + (typeof methods[key]) + \"\\\" in the component definition. \" +\n            \"Did you reference the function correctly?\",\n            vm\n          );\n        }\n        if (props && hasOwn(props, key)) {\n          warn(\n            (\"Method \\\"\" + key + \"\\\" has already been defined as a prop.\"),\n            vm\n          );\n        }\n        if ((key in vm) && isReserved(key)) {\n          warn(\n            \"Method \\\"\" + key + \"\\\" conflicts with an existing Vue instance method. \" +\n            \"Avoid defining component methods that start with _ or $.\"\n          );\n        }\n      }\n      vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);\n    }\n  }\n\n  function initWatch (vm, watch) {\n    for (var key in watch) {\n      var handler = watch[key];\n      if (Array.isArray(handler)) {\n        for (var i = 0; i < handler.length; i++) {\n          createWatcher(vm, key, handler[i]);\n        }\n      } else {\n        createWatcher(vm, key, handler);\n      }\n    }\n  }\n\n  function createWatcher (\n    vm,\n    expOrFn,\n    handler,\n    options\n  ) {\n    if (isPlainObject(handler)) {\n      options = handler;\n      handler = handler.handler;\n    }\n    if (typeof handler === 'string') {\n      handler = vm[handler];\n    }\n    return vm.$watch(expOrFn, handler, options)\n  }\n\n  function stateMixin (Vue) {\n    // flow somehow has problems with directly declared definition object\n    // when using Object.defineProperty, so we have to procedurally build up\n    // the object here.\n    var dataDef = {};\n    dataDef.get = function () { return this._data };\n    var propsDef = {};\n    propsDef.get = function () { return this._props };\n    {\n      dataDef.set = function () {\n        warn(\n          'Avoid replacing instance root $data. ' +\n          'Use nested data properties instead.',\n          this\n        );\n      };\n      propsDef.set = function () {\n        warn(\"$props is readonly.\", this);\n      };\n    }\n    Object.defineProperty(Vue.prototype, '$data', dataDef);\n    Object.defineProperty(Vue.prototype, '$props', propsDef);\n\n    Vue.prototype.$set = set;\n    Vue.prototype.$delete = del;\n\n    Vue.prototype.$watch = function (\n      expOrFn,\n      cb,\n      options\n    ) {\n      var vm = this;\n      if (isPlainObject(cb)) {\n        return createWatcher(vm, expOrFn, cb, options)\n      }\n      options = options || {};\n      options.user = true;\n      var watcher = new Watcher(vm, expOrFn, cb, options);\n      if (options.immediate) {\n        try {\n          cb.call(vm, watcher.value);\n        } catch (error) {\n          handleError(error, vm, (\"callback for immediate watcher \\\"\" + (watcher.expression) + \"\\\"\"));\n        }\n      }\n      return function unwatchFn () {\n        watcher.teardown();\n      }\n    };\n  }\n\n  /*  */\n\n  function initProvide (vm) {\n    var provide = vm.$options.provide;\n    if (provide) {\n      vm._provided = typeof provide === 'function'\n        ? provide.call(vm)\n        : provide;\n    }\n  }\n\n  function initInjections (vm) {\n    var result = resolveInject(vm.$options.inject, vm);\n    if (result) {\n      toggleObserving(false);\n      Object.keys(result).forEach(function (key) {\n        /* istanbul ignore else */\n        {\n          defineReactive$$1(vm, key, result[key], function () {\n            warn(\n              \"Avoid mutating an injected value directly since the changes will be \" +\n              \"overwritten whenever the provided component re-renders. \" +\n              \"injection being mutated: \\\"\" + key + \"\\\"\",\n              vm\n            );\n          });\n        }\n      });\n      toggleObserving(true);\n    }\n  }\n\n  function resolveInject (inject, vm) {\n    if (inject) {\n      // inject is :any because flow is not smart enough to figure out cached\n      var result = Object.create(null);\n      var keys = hasSymbol\n        ? Reflect.ownKeys(inject).filter(function (key) {\n          /* istanbul ignore next */\n          return Object.getOwnPropertyDescriptor(inject, key).enumerable\n        })\n        : Object.keys(inject);\n\n      for (var i = 0; i < keys.length; i++) {\n        var key = keys[i];\n        var provideKey = inject[key].from;\n        var source = vm;\n        while (source) {\n          if (source._provided && hasOwn(source._provided, provideKey)) {\n            result[key] = source._provided[provideKey];\n            break\n          }\n          source = source.$parent;\n        }\n        if (!source) {\n          if ('default' in inject[key]) {\n            var provideDefault = inject[key].default;\n            result[key] = typeof provideDefault === 'function'\n              ? provideDefault.call(vm)\n              : provideDefault;\n          } else {\n            warn((\"Injection \\\"\" + key + \"\\\" not found\"), vm);\n          }\n        }\n      }\n      return result\n    }\n  }\n\n  /*  */\n\n  /**\n   * Runtime helper for rendering v-for lists.\n   */\n  function renderList (\n    val,\n    render\n  ) {\n    var ret, i, l, keys, key;\n    if (Array.isArray(val) || typeof val === 'string') {\n      ret = new Array(val.length);\n      for (i = 0, l = val.length; i < l; i++) {\n        ret[i] = render(val[i], i);\n      }\n    } else if (typeof val === 'number') {\n      ret = new Array(val);\n      for (i = 0; i < val; i++) {\n        ret[i] = render(i + 1, i);\n      }\n    } else if (isObject(val)) {\n      keys = Object.keys(val);\n      ret = new Array(keys.length);\n      for (i = 0, l = keys.length; i < l; i++) {\n        key = keys[i];\n        ret[i] = render(val[key], key, i);\n      }\n    }\n    if (!isDef(ret)) {\n      ret = [];\n    }\n    (ret)._isVList = true;\n    return ret\n  }\n\n  /*  */\n\n  /**\n   * Runtime helper for rendering <slot>\n   */\n  function renderSlot (\n    name,\n    fallback,\n    props,\n    bindObject\n  ) {\n    var scopedSlotFn = this.$scopedSlots[name];\n    var nodes;\n    if (scopedSlotFn) { // scoped slot\n      props = props || {};\n      if (bindObject) {\n        if (!isObject(bindObject)) {\n          warn(\n            'slot v-bind without argument expects an Object',\n            this\n          );\n        }\n        props = extend(extend({}, bindObject), props);\n      }\n      nodes = scopedSlotFn(props) || fallback;\n    } else {\n      nodes = this.$slots[name] || fallback;\n    }\n\n    var target = props && props.slot;\n    if (target) {\n      return this.$createElement('template', { slot: target }, nodes)\n    } else {\n      return nodes\n    }\n  }\n\n  /*  */\n\n  /**\n   * Runtime helper for resolving filters\n   */\n  function resolveFilter (id) {\n    return resolveAsset(this.$options, 'filters', id, true) || identity\n  }\n\n  /*  */\n\n  function isKeyNotMatch (expect, actual) {\n    if (Array.isArray(expect)) {\n      return expect.indexOf(actual) === -1\n    } else {\n      return expect !== actual\n    }\n  }\n\n  /**\n   * Runtime helper for checking keyCodes from config.\n   * exposed as Vue.prototype._k\n   * passing in eventKeyName as last argument separately for backwards compat\n   */\n  function checkKeyCodes (\n    eventKeyCode,\n    key,\n    builtInKeyCode,\n    eventKeyName,\n    builtInKeyName\n  ) {\n    var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;\n    if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {\n      return isKeyNotMatch(builtInKeyName, eventKeyName)\n    } else if (mappedKeyCode) {\n      return isKeyNotMatch(mappedKeyCode, eventKeyCode)\n    } else if (eventKeyName) {\n      return hyphenate(eventKeyName) !== key\n    }\n  }\n\n  /*  */\n\n  /**\n   * Runtime helper for merging v-bind=\"object\" into a VNode's data.\n   */\n  function bindObjectProps (\n    data,\n    tag,\n    value,\n    asProp,\n    isSync\n  ) {\n    if (value) {\n      if (!isObject(value)) {\n        warn(\n          'v-bind without argument expects an Object or Array value',\n          this\n        );\n      } else {\n        if (Array.isArray(value)) {\n          value = toObject(value);\n        }\n        var hash;\n        var loop = function ( key ) {\n          if (\n            key === 'class' ||\n            key === 'style' ||\n            isReservedAttribute(key)\n          ) {\n            hash = data;\n          } else {\n            var type = data.attrs && data.attrs.type;\n            hash = asProp || config.mustUseProp(tag, type, key)\n              ? data.domProps || (data.domProps = {})\n              : data.attrs || (data.attrs = {});\n          }\n          var camelizedKey = camelize(key);\n          if (!(key in hash) && !(camelizedKey in hash)) {\n            hash[key] = value[key];\n\n            if (isSync) {\n              var on = data.on || (data.on = {});\n              on[(\"update:\" + camelizedKey)] = function ($event) {\n                value[key] = $event;\n              };\n            }\n          }\n        };\n\n        for (var key in value) loop( key );\n      }\n    }\n    return data\n  }\n\n  /*  */\n\n  /**\n   * Runtime helper for rendering static trees.\n   */\n  function renderStatic (\n    index,\n    isInFor\n  ) {\n    var cached = this._staticTrees || (this._staticTrees = []);\n    var tree = cached[index];\n    // if has already-rendered static tree and not inside v-for,\n    // we can reuse the same tree.\n    if (tree && !isInFor) {\n      return tree\n    }\n    // otherwise, render a fresh tree.\n    tree = cached[index] = this.$options.staticRenderFns[index].call(\n      this._renderProxy,\n      null,\n      this // for render fns generated for functional component templates\n    );\n    markStatic(tree, (\"__static__\" + index), false);\n    return tree\n  }\n\n  /**\n   * Runtime helper for v-once.\n   * Effectively it means marking the node as static with a unique key.\n   */\n  function markOnce (\n    tree,\n    index,\n    key\n  ) {\n    markStatic(tree, (\"__once__\" + index + (key ? (\"_\" + key) : \"\")), true);\n    return tree\n  }\n\n  function markStatic (\n    tree,\n    key,\n    isOnce\n  ) {\n    if (Array.isArray(tree)) {\n      for (var i = 0; i < tree.length; i++) {\n        if (tree[i] && typeof tree[i] !== 'string') {\n          markStaticNode(tree[i], (key + \"_\" + i), isOnce);\n        }\n      }\n    } else {\n      markStaticNode(tree, key, isOnce);\n    }\n  }\n\n  function markStaticNode (node, key, isOnce) {\n    node.isStatic = true;\n    node.key = key;\n    node.isOnce = isOnce;\n  }\n\n  /*  */\n\n  function bindObjectListeners (data, value) {\n    if (value) {\n      if (!isPlainObject(value)) {\n        warn(\n          'v-on without argument expects an Object value',\n          this\n        );\n      } else {\n        var on = data.on = data.on ? extend({}, data.on) : {};\n        for (var key in value) {\n          var existing = on[key];\n          var ours = value[key];\n          on[key] = existing ? [].concat(existing, ours) : ours;\n        }\n      }\n    }\n    return data\n  }\n\n  /*  */\n\n  function installRenderHelpers (target) {\n    target._o = markOnce;\n    target._n = toNumber;\n    target._s = toString;\n    target._l = renderList;\n    target._t = renderSlot;\n    target._q = looseEqual;\n    target._i = looseIndexOf;\n    target._m = renderStatic;\n    target._f = resolveFilter;\n    target._k = checkKeyCodes;\n    target._b = bindObjectProps;\n    target._v = createTextVNode;\n    target._e = createEmptyVNode;\n    target._u = resolveScopedSlots;\n    target._g = bindObjectListeners;\n  }\n\n  /*  */\n\n  function FunctionalRenderContext (\n    data,\n    props,\n    children,\n    parent,\n    Ctor\n  ) {\n    var options = Ctor.options;\n    // ensure the createElement function in functional components\n    // gets a unique context - this is necessary for correct named slot check\n    var contextVm;\n    if (hasOwn(parent, '_uid')) {\n      contextVm = Object.create(parent);\n      // $flow-disable-line\n      contextVm._original = parent;\n    } else {\n      // the context vm passed in is a functional context as well.\n      // in this case we want to make sure we are able to get a hold to the\n      // real context instance.\n      contextVm = parent;\n      // $flow-disable-line\n      parent = parent._original;\n    }\n    var isCompiled = isTrue(options._compiled);\n    var needNormalization = !isCompiled;\n\n    this.data = data;\n    this.props = props;\n    this.children = children;\n    this.parent = parent;\n    this.listeners = data.on || emptyObject;\n    this.injections = resolveInject(options.inject, parent);\n    this.slots = function () { return resolveSlots(children, parent); };\n\n    // support for compiled functional template\n    if (isCompiled) {\n      // exposing $options for renderStatic()\n      this.$options = options;\n      // pre-resolve slots for renderSlot()\n      this.$slots = this.slots();\n      this.$scopedSlots = data.scopedSlots || emptyObject;\n    }\n\n    if (options._scopeId) {\n      this._c = function (a, b, c, d) {\n        var vnode = createElement(contextVm, a, b, c, d, needNormalization);\n        if (vnode && !Array.isArray(vnode)) {\n          vnode.fnScopeId = options._scopeId;\n          vnode.fnContext = parent;\n        }\n        return vnode\n      };\n    } else {\n      this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };\n    }\n  }\n\n  installRenderHelpers(FunctionalRenderContext.prototype);\n\n  function createFunctionalComponent (\n    Ctor,\n    propsData,\n    data,\n    contextVm,\n    children\n  ) {\n    var options = Ctor.options;\n    var props = {};\n    var propOptions = options.props;\n    if (isDef(propOptions)) {\n      for (var key in propOptions) {\n        props[key] = validateProp(key, propOptions, propsData || emptyObject);\n      }\n    } else {\n      if (isDef(data.attrs)) { mergeProps(props, data.attrs); }\n      if (isDef(data.props)) { mergeProps(props, data.props); }\n    }\n\n    var renderContext = new FunctionalRenderContext(\n      data,\n      props,\n      children,\n      contextVm,\n      Ctor\n    );\n\n    var vnode = options.render.call(null, renderContext._c, renderContext);\n\n    if (vnode instanceof VNode) {\n      return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)\n    } else if (Array.isArray(vnode)) {\n      var vnodes = normalizeChildren(vnode) || [];\n      var res = new Array(vnodes.length);\n      for (var i = 0; i < vnodes.length; i++) {\n        res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);\n      }\n      return res\n    }\n  }\n\n  function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {\n    // #7817 clone node before setting fnContext, otherwise if the node is reused\n    // (e.g. it was from a cached normal slot) the fnContext causes named slots\n    // that should not be matched to match.\n    var clone = cloneVNode(vnode);\n    clone.fnContext = contextVm;\n    clone.fnOptions = options;\n    {\n      (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;\n    }\n    if (data.slot) {\n      (clone.data || (clone.data = {})).slot = data.slot;\n    }\n    return clone\n  }\n\n  function mergeProps (to, from) {\n    for (var key in from) {\n      to[camelize(key)] = from[key];\n    }\n  }\n\n  /*  */\n\n  /*  */\n\n  /*  */\n\n  /*  */\n\n  // inline hooks to be invoked on component VNodes during patch\n  var componentVNodeHooks = {\n    init: function init (vnode, hydrating) {\n      if (\n        vnode.componentInstance &&\n        !vnode.componentInstance._isDestroyed &&\n        vnode.data.keepAlive\n      ) {\n        // kept-alive components, treat as a patch\n        var mountedNode = vnode; // work around flow\n        componentVNodeHooks.prepatch(mountedNode, mountedNode);\n      } else {\n        var child = vnode.componentInstance = createComponentInstanceForVnode(\n          vnode,\n          activeInstance\n        );\n        child.$mount(hydrating ? vnode.elm : undefined, hydrating);\n      }\n    },\n\n    prepatch: function prepatch (oldVnode, vnode) {\n      var options = vnode.componentOptions;\n      var child = vnode.componentInstance = oldVnode.componentInstance;\n      updateChildComponent(\n        child,\n        options.propsData, // updated props\n        options.listeners, // updated listeners\n        vnode, // new parent vnode\n        options.children // new children\n      );\n    },\n\n    insert: function insert (vnode) {\n      var context = vnode.context;\n      var componentInstance = vnode.componentInstance;\n      if (!componentInstance._isMounted) {\n        componentInstance._isMounted = true;\n        callHook(componentInstance, 'mounted');\n      }\n      if (vnode.data.keepAlive) {\n        if (context._isMounted) {\n          // vue-router#1212\n          // During updates, a kept-alive component's child components may\n          // change, so directly walking the tree here may call activated hooks\n          // on incorrect children. Instead we push them into a queue which will\n          // be processed after the whole patch process ended.\n          queueActivatedComponent(componentInstance);\n        } else {\n          activateChildComponent(componentInstance, true /* direct */);\n        }\n      }\n    },\n\n    destroy: function destroy (vnode) {\n      var componentInstance = vnode.componentInstance;\n      if (!componentInstance._isDestroyed) {\n        if (!vnode.data.keepAlive) {\n          componentInstance.$destroy();\n        } else {\n          deactivateChildComponent(componentInstance, true /* direct */);\n        }\n      }\n    }\n  };\n\n  var hooksToMerge = Object.keys(componentVNodeHooks);\n\n  function createComponent (\n    Ctor,\n    data,\n    context,\n    children,\n    tag\n  ) {\n    if (isUndef(Ctor)) {\n      return\n    }\n\n    var baseCtor = context.$options._base;\n\n    // plain options object: turn it into a constructor\n    if (isObject(Ctor)) {\n      Ctor = baseCtor.extend(Ctor);\n    }\n\n    // if at this stage it's not a constructor or an async component factory,\n    // reject.\n    if (typeof Ctor !== 'function') {\n      {\n        warn((\"Invalid Component definition: \" + (String(Ctor))), context);\n      }\n      return\n    }\n\n    // async component\n    var asyncFactory;\n    if (isUndef(Ctor.cid)) {\n      asyncFactory = Ctor;\n      Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);\n      if (Ctor === undefined) {\n        // return a placeholder node for async component, which is rendered\n        // as a comment node but preserves all the raw information for the node.\n        // the information will be used for async server-rendering and hydration.\n        return createAsyncPlaceholder(\n          asyncFactory,\n          data,\n          context,\n          children,\n          tag\n        )\n      }\n    }\n\n    data = data || {};\n\n    // resolve constructor options in case global mixins are applied after\n    // component constructor creation\n    resolveConstructorOptions(Ctor);\n\n    // transform component v-model data into props & events\n    if (isDef(data.model)) {\n      transformModel(Ctor.options, data);\n    }\n\n    // extract props\n    var propsData = extractPropsFromVNodeData(data, Ctor, tag);\n\n    // functional component\n    if (isTrue(Ctor.options.functional)) {\n      return createFunctionalComponent(Ctor, propsData, data, context, children)\n    }\n\n    // extract listeners, since these needs to be treated as\n    // child component listeners instead of DOM listeners\n    var listeners = data.on;\n    // replace with listeners with .native modifier\n    // so it gets processed during parent component patch.\n    data.on = data.nativeOn;\n\n    if (isTrue(Ctor.options.abstract)) {\n      // abstract components do not keep anything\n      // other than props & listeners & slot\n\n      // work around flow\n      var slot = data.slot;\n      data = {};\n      if (slot) {\n        data.slot = slot;\n      }\n    }\n\n    // install component management hooks onto the placeholder node\n    installComponentHooks(data);\n\n    // return a placeholder vnode\n    var name = Ctor.options.name || tag;\n    var vnode = new VNode(\n      (\"vue-component-\" + (Ctor.cid) + (name ? (\"-\" + name) : '')),\n      data, undefined, undefined, undefined, context,\n      { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },\n      asyncFactory\n    );\n\n    return vnode\n  }\n\n  function createComponentInstanceForVnode (\n    vnode, // we know it's MountedComponentVNode but flow doesn't\n    parent // activeInstance in lifecycle state\n  ) {\n    var options = {\n      _isComponent: true,\n      _parentVnode: vnode,\n      parent: parent\n    };\n    // check inline-template render functions\n    var inlineTemplate = vnode.data.inlineTemplate;\n    if (isDef(inlineTemplate)) {\n      options.render = inlineTemplate.render;\n      options.staticRenderFns = inlineTemplate.staticRenderFns;\n    }\n    return new vnode.componentOptions.Ctor(options)\n  }\n\n  function installComponentHooks (data) {\n    var hooks = data.hook || (data.hook = {});\n    for (var i = 0; i < hooksToMerge.length; i++) {\n      var key = hooksToMerge[i];\n      var existing = hooks[key];\n      var toMerge = componentVNodeHooks[key];\n      if (existing !== toMerge && !(existing && existing._merged)) {\n        hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;\n      }\n    }\n  }\n\n  function mergeHook$1 (f1, f2) {\n    var merged = function (a, b) {\n      // flow complains about extra args which is why we use any\n      f1(a, b);\n      f2(a, b);\n    };\n    merged._merged = true;\n    return merged\n  }\n\n  // transform component v-model info (value and callback) into\n  // prop and event handler respectively.\n  function transformModel (options, data) {\n    var prop = (options.model && options.model.prop) || 'value';\n    var event = (options.model && options.model.event) || 'input'\n    ;(data.props || (data.props = {}))[prop] = data.model.value;\n    var on = data.on || (data.on = {});\n    var existing = on[event];\n    var callback = data.model.callback;\n    if (isDef(existing)) {\n      if (\n        Array.isArray(existing)\n          ? existing.indexOf(callback) === -1\n          : existing !== callback\n      ) {\n        on[event] = [callback].concat(existing);\n      }\n    } else {\n      on[event] = callback;\n    }\n  }\n\n  /*  */\n\n  var SIMPLE_NORMALIZE = 1;\n  var ALWAYS_NORMALIZE = 2;\n\n  // wrapper function for providing a more flexible interface\n  // without getting yelled at by flow\n  function createElement (\n    context,\n    tag,\n    data,\n    children,\n    normalizationType,\n    alwaysNormalize\n  ) {\n    if (Array.isArray(data) || isPrimitive(data)) {\n      normalizationType = children;\n      children = data;\n      data = undefined;\n    }\n    if (isTrue(alwaysNormalize)) {\n      normalizationType = ALWAYS_NORMALIZE;\n    }\n    return _createElement(context, tag, data, children, normalizationType)\n  }\n\n  function _createElement (\n    context,\n    tag,\n    data,\n    children,\n    normalizationType\n  ) {\n    if (isDef(data) && isDef((data).__ob__)) {\n      warn(\n        \"Avoid using observed data object as vnode data: \" + (JSON.stringify(data)) + \"\\n\" +\n        'Always create fresh vnode data objects in each render!',\n        context\n      );\n      return createEmptyVNode()\n    }\n    // object syntax in v-bind\n    if (isDef(data) && isDef(data.is)) {\n      tag = data.is;\n    }\n    if (!tag) {\n      // in case of component :is set to falsy value\n      return createEmptyVNode()\n    }\n    // warn against non-primitive key\n    if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)\n    ) {\n      {\n        warn(\n          'Avoid using non-primitive value as key, ' +\n          'use string/number value instead.',\n          context\n        );\n      }\n    }\n    // support single function children as default scoped slot\n    if (Array.isArray(children) &&\n      typeof children[0] === 'function'\n    ) {\n      data = data || {};\n      data.scopedSlots = { default: children[0] };\n      children.length = 0;\n    }\n    if (normalizationType === ALWAYS_NORMALIZE) {\n      children = normalizeChildren(children);\n    } else if (normalizationType === SIMPLE_NORMALIZE) {\n      children = simpleNormalizeChildren(children);\n    }\n    var vnode, ns;\n    if (typeof tag === 'string') {\n      var Ctor;\n      ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);\n      if (config.isReservedTag(tag)) {\n        // platform built-in elements\n        vnode = new VNode(\n          config.parsePlatformTagName(tag), data, children,\n          undefined, undefined, context\n        );\n      } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {\n        // component\n        vnode = createComponent(Ctor, data, context, children, tag);\n      } else {\n        // unknown or unlisted namespaced elements\n        // check at runtime because it may get assigned a namespace when its\n        // parent normalizes children\n        vnode = new VNode(\n          tag, data, children,\n          undefined, undefined, context\n        );\n      }\n    } else {\n      // direct component options / constructor\n      vnode = createComponent(tag, data, context, children);\n    }\n    if (Array.isArray(vnode)) {\n      return vnode\n    } else if (isDef(vnode)) {\n      if (isDef(ns)) { applyNS(vnode, ns); }\n      if (isDef(data)) { registerDeepBindings(data); }\n      return vnode\n    } else {\n      return createEmptyVNode()\n    }\n  }\n\n  function applyNS (vnode, ns, force) {\n    vnode.ns = ns;\n    if (vnode.tag === 'foreignObject') {\n      // use default namespace inside foreignObject\n      ns = undefined;\n      force = true;\n    }\n    if (isDef(vnode.children)) {\n      for (var i = 0, l = vnode.children.length; i < l; i++) {\n        var child = vnode.children[i];\n        if (isDef(child.tag) && (\n          isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {\n          applyNS(child, ns, force);\n        }\n      }\n    }\n  }\n\n  // ref #5318\n  // necessary to ensure parent re-render when deep bindings like :style and\n  // :class are used on slot nodes\n  function registerDeepBindings (data) {\n    if (isObject(data.style)) {\n      traverse(data.style);\n    }\n    if (isObject(data.class)) {\n      traverse(data.class);\n    }\n  }\n\n  /*  */\n\n  function initRender (vm) {\n    vm._vnode = null; // the root of the child tree\n    vm._staticTrees = null; // v-once cached trees\n    var options = vm.$options;\n    var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree\n    var renderContext = parentVnode && parentVnode.context;\n    vm.$slots = resolveSlots(options._renderChildren, renderContext);\n    vm.$scopedSlots = emptyObject;\n    // bind the createElement fn to this instance\n    // so that we get proper render context inside it.\n    // args order: tag, data, children, normalizationType, alwaysNormalize\n    // internal version is used by render functions compiled from templates\n    vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };\n    // normalization is always applied for the public version, used in\n    // user-written render functions.\n    vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };\n\n    // $attrs & $listeners are exposed for easier HOC creation.\n    // they need to be reactive so that HOCs using them are always updated\n    var parentData = parentVnode && parentVnode.data;\n\n    /* istanbul ignore else */\n    {\n      defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {\n        !isUpdatingChildComponent && warn(\"$attrs is readonly.\", vm);\n      }, true);\n      defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {\n        !isUpdatingChildComponent && warn(\"$listeners is readonly.\", vm);\n      }, true);\n    }\n  }\n\n  function renderMixin (Vue) {\n    // install runtime convenience helpers\n    installRenderHelpers(Vue.prototype);\n\n    Vue.prototype.$nextTick = function (fn) {\n      return nextTick(fn, this)\n    };\n\n    Vue.prototype._render = function () {\n      var vm = this;\n      var ref = vm.$options;\n      var render = ref.render;\n      var _parentVnode = ref._parentVnode;\n\n      if (_parentVnode) {\n        vm.$scopedSlots = _parentVnode.data.scopedSlots || emptyObject;\n      }\n\n      // set parent vnode. this allows render functions to have access\n      // to the data on the placeholder node.\n      vm.$vnode = _parentVnode;\n      // render self\n      var vnode;\n      try {\n        vnode = render.call(vm._renderProxy, vm.$createElement);\n      } catch (e) {\n        handleError(e, vm, \"render\");\n        // return error render result,\n        // or previous vnode to prevent render error causing blank component\n        /* istanbul ignore else */\n        if (vm.$options.renderError) {\n          try {\n            vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);\n          } catch (e) {\n            handleError(e, vm, \"renderError\");\n            vnode = vm._vnode;\n          }\n        } else {\n          vnode = vm._vnode;\n        }\n      }\n      // return empty vnode in case the render function errored out\n      if (!(vnode instanceof VNode)) {\n        if (Array.isArray(vnode)) {\n          warn(\n            'Multiple root nodes returned from render function. Render function ' +\n            'should return a single root node.',\n            vm\n          );\n        }\n        vnode = createEmptyVNode();\n      }\n      // set parent\n      vnode.parent = _parentVnode;\n      return vnode\n    };\n  }\n\n  /*  */\n\n  var uid$3 = 0;\n\n  function initMixin (Vue) {\n    Vue.prototype._init = function (options) {\n      var vm = this;\n      // a uid\n      vm._uid = uid$3++;\n\n      var startTag, endTag;\n      /* istanbul ignore if */\n      if (config.performance && mark) {\n        startTag = \"vue-perf-start:\" + (vm._uid);\n        endTag = \"vue-perf-end:\" + (vm._uid);\n        mark(startTag);\n      }\n\n      // a flag to avoid this being observed\n      vm._isVue = true;\n      // merge options\n      if (options && options._isComponent) {\n        // optimize internal component instantiation\n        // since dynamic options merging is pretty slow, and none of the\n        // internal component options needs special treatment.\n        initInternalComponent(vm, options);\n      } else {\n        vm.$options = mergeOptions(\n          resolveConstructorOptions(vm.constructor),\n          options || {},\n          vm\n        );\n      }\n      /* istanbul ignore else */\n      {\n        initProxy(vm);\n      }\n      // expose real self\n      vm._self = vm;\n      initLifecycle(vm);\n      initEvents(vm);\n      initRender(vm);\n      callHook(vm, 'beforeCreate');\n      initInjections(vm); // resolve injections before data/props\n      initState(vm);\n      initProvide(vm); // resolve provide after data/props\n      callHook(vm, 'created');\n\n      /* istanbul ignore if */\n      if (config.performance && mark) {\n        vm._name = formatComponentName(vm, false);\n        mark(endTag);\n        measure((\"vue \" + (vm._name) + \" init\"), startTag, endTag);\n      }\n\n      if (vm.$options.el) {\n        vm.$mount(vm.$options.el);\n      }\n    };\n  }\n\n  function initInternalComponent (vm, options) {\n    var opts = vm.$options = Object.create(vm.constructor.options);\n    // doing this because it's faster than dynamic enumeration.\n    var parentVnode = options._parentVnode;\n    opts.parent = options.parent;\n    opts._parentVnode = parentVnode;\n\n    var vnodeComponentOptions = parentVnode.componentOptions;\n    opts.propsData = vnodeComponentOptions.propsData;\n    opts._parentListeners = vnodeComponentOptions.listeners;\n    opts._renderChildren = vnodeComponentOptions.children;\n    opts._componentTag = vnodeComponentOptions.tag;\n\n    if (options.render) {\n      opts.render = options.render;\n      opts.staticRenderFns = options.staticRenderFns;\n    }\n  }\n\n  function resolveConstructorOptions (Ctor) {\n    var options = Ctor.options;\n    if (Ctor.super) {\n      var superOptions = resolveConstructorOptions(Ctor.super);\n      var cachedSuperOptions = Ctor.superOptions;\n      if (superOptions !== cachedSuperOptions) {\n        // super option changed,\n        // need to resolve new options.\n        Ctor.superOptions = superOptions;\n        // check if there are any late-modified/attached options (#4976)\n        var modifiedOptions = resolveModifiedOptions(Ctor);\n        // update base extend options\n        if (modifiedOptions) {\n          extend(Ctor.extendOptions, modifiedOptions);\n        }\n        options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);\n        if (options.name) {\n          options.components[options.name] = Ctor;\n        }\n      }\n    }\n    return options\n  }\n\n  function resolveModifiedOptions (Ctor) {\n    var modified;\n    var latest = Ctor.options;\n    var sealed = Ctor.sealedOptions;\n    for (var key in latest) {\n      if (latest[key] !== sealed[key]) {\n        if (!modified) { modified = {}; }\n        modified[key] = latest[key];\n      }\n    }\n    return modified\n  }\n\n  function Vue (options) {\n    if (!(this instanceof Vue)\n    ) {\n      warn('Vue is a constructor and should be called with the `new` keyword');\n    }\n    this._init(options);\n  }\n\n  initMixin(Vue);\n  stateMixin(Vue);\n  eventsMixin(Vue);\n  lifecycleMixin(Vue);\n  renderMixin(Vue);\n\n  /*  */\n\n  function initUse (Vue) {\n    Vue.use = function (plugin) {\n      var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));\n      if (installedPlugins.indexOf(plugin) > -1) {\n        return this\n      }\n\n      // additional parameters\n      var args = toArray(arguments, 1);\n      args.unshift(this);\n      if (typeof plugin.install === 'function') {\n        plugin.install.apply(plugin, args);\n      } else if (typeof plugin === 'function') {\n        plugin.apply(null, args);\n      }\n      installedPlugins.push(plugin);\n      return this\n    };\n  }\n\n  /*  */\n\n  function initMixin$1 (Vue) {\n    Vue.mixin = function (mixin) {\n      this.options = mergeOptions(this.options, mixin);\n      return this\n    };\n  }\n\n  /*  */\n\n  function initExtend (Vue) {\n    /**\n     * Each instance constructor, including Vue, has a unique\n     * cid. This enables us to create wrapped \"child\n     * constructors\" for prototypal inheritance and cache them.\n     */\n    Vue.cid = 0;\n    var cid = 1;\n\n    /**\n     * Class inheritance\n     */\n    Vue.extend = function (extendOptions) {\n      extendOptions = extendOptions || {};\n      var Super = this;\n      var SuperId = Super.cid;\n      var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});\n      if (cachedCtors[SuperId]) {\n        return cachedCtors[SuperId]\n      }\n\n      var name = extendOptions.name || Super.options.name;\n      if (name) {\n        validateComponentName(name);\n      }\n\n      var Sub = function VueComponent (options) {\n        this._init(options);\n      };\n      Sub.prototype = Object.create(Super.prototype);\n      Sub.prototype.constructor = Sub;\n      Sub.cid = cid++;\n      Sub.options = mergeOptions(\n        Super.options,\n        extendOptions\n      );\n      Sub['super'] = Super;\n\n      // For props and computed properties, we define the proxy getters on\n      // the Vue instances at extension time, on the extended prototype. This\n      // avoids Object.defineProperty calls for each instance created.\n      if (Sub.options.props) {\n        initProps$1(Sub);\n      }\n      if (Sub.options.computed) {\n        initComputed$1(Sub);\n      }\n\n      // allow further extension/mixin/plugin usage\n      Sub.extend = Super.extend;\n      Sub.mixin = Super.mixin;\n      Sub.use = Super.use;\n\n      // create asset registers, so extended classes\n      // can have their private assets too.\n      ASSET_TYPES.forEach(function (type) {\n        Sub[type] = Super[type];\n      });\n      // enable recursive self-lookup\n      if (name) {\n        Sub.options.components[name] = Sub;\n      }\n\n      // keep a reference to the super options at extension time.\n      // later at instantiation we can check if Super's options have\n      // been updated.\n      Sub.superOptions = Super.options;\n      Sub.extendOptions = extendOptions;\n      Sub.sealedOptions = extend({}, Sub.options);\n\n      // cache constructor\n      cachedCtors[SuperId] = Sub;\n      return Sub\n    };\n  }\n\n  function initProps$1 (Comp) {\n    var props = Comp.options.props;\n    for (var key in props) {\n      proxy(Comp.prototype, \"_props\", key);\n    }\n  }\n\n  function initComputed$1 (Comp) {\n    var computed = Comp.options.computed;\n    for (var key in computed) {\n      defineComputed(Comp.prototype, key, computed[key]);\n    }\n  }\n\n  /*  */\n\n  function initAssetRegisters (Vue) {\n    /**\n     * Create asset registration methods.\n     */\n    ASSET_TYPES.forEach(function (type) {\n      Vue[type] = function (\n        id,\n        definition\n      ) {\n        if (!definition) {\n          return this.options[type + 's'][id]\n        } else {\n          /* istanbul ignore if */\n          if (type === 'component') {\n            validateComponentName(id);\n          }\n          if (type === 'component' && isPlainObject(definition)) {\n            definition.name = definition.name || id;\n            definition = this.options._base.extend(definition);\n          }\n          if (type === 'directive' && typeof definition === 'function') {\n            definition = { bind: definition, update: definition };\n          }\n          this.options[type + 's'][id] = definition;\n          return definition\n        }\n      };\n    });\n  }\n\n  /*  */\n\n\n\n  function getComponentName (opts) {\n    return opts && (opts.Ctor.options.name || opts.tag)\n  }\n\n  function matches (pattern, name) {\n    if (Array.isArray(pattern)) {\n      return pattern.indexOf(name) > -1\n    } else if (typeof pattern === 'string') {\n      return pattern.split(',').indexOf(name) > -1\n    } else if (isRegExp(pattern)) {\n      return pattern.test(name)\n    }\n    /* istanbul ignore next */\n    return false\n  }\n\n  function pruneCache (keepAliveInstance, filter) {\n    var cache = keepAliveInstance.cache;\n    var keys = keepAliveInstance.keys;\n    var _vnode = keepAliveInstance._vnode;\n    for (var key in cache) {\n      var cachedNode = cache[key];\n      if (cachedNode) {\n        var name = getComponentName(cachedNode.componentOptions);\n        if (name && !filter(name)) {\n          pruneCacheEntry(cache, key, keys, _vnode);\n        }\n      }\n    }\n  }\n\n  function pruneCacheEntry (\n    cache,\n    key,\n    keys,\n    current\n  ) {\n    var cached$$1 = cache[key];\n    if (cached$$1 && (!current || cached$$1.tag !== current.tag)) {\n      cached$$1.componentInstance.$destroy();\n    }\n    cache[key] = null;\n    remove(keys, key);\n  }\n\n  var patternTypes = [String, RegExp, Array];\n\n  var KeepAlive = {\n    name: 'keep-alive',\n    abstract: true,\n\n    props: {\n      include: patternTypes,\n      exclude: patternTypes,\n      max: [String, Number]\n    },\n\n    created: function created () {\n      this.cache = Object.create(null);\n      this.keys = [];\n    },\n\n    destroyed: function destroyed () {\n      for (var key in this.cache) {\n        pruneCacheEntry(this.cache, key, this.keys);\n      }\n    },\n\n    mounted: function mounted () {\n      var this$1 = this;\n\n      this.$watch('include', function (val) {\n        pruneCache(this$1, function (name) { return matches(val, name); });\n      });\n      this.$watch('exclude', function (val) {\n        pruneCache(this$1, function (name) { return !matches(val, name); });\n      });\n    },\n\n    render: function render () {\n      var slot = this.$slots.default;\n      var vnode = getFirstComponentChild(slot);\n      var componentOptions = vnode && vnode.componentOptions;\n      if (componentOptions) {\n        // check pattern\n        var name = getComponentName(componentOptions);\n        var ref = this;\n        var include = ref.include;\n        var exclude = ref.exclude;\n        if (\n          // not included\n          (include && (!name || !matches(include, name))) ||\n          // excluded\n          (exclude && name && matches(exclude, name))\n        ) {\n          return vnode\n        }\n\n        var ref$1 = this;\n        var cache = ref$1.cache;\n        var keys = ref$1.keys;\n        var key = vnode.key == null\n          // same constructor may get registered as different local components\n          // so cid alone is not enough (#3269)\n          ? componentOptions.Ctor.cid + (componentOptions.tag ? (\"::\" + (componentOptions.tag)) : '')\n          : vnode.key;\n        if (cache[key]) {\n          vnode.componentInstance = cache[key].componentInstance;\n          // make current key freshest\n          remove(keys, key);\n          keys.push(key);\n        } else {\n          cache[key] = vnode;\n          keys.push(key);\n          // prune oldest entry\n          if (this.max && keys.length > parseInt(this.max)) {\n            pruneCacheEntry(cache, keys[0], keys, this._vnode);\n          }\n        }\n\n        vnode.data.keepAlive = true;\n      }\n      return vnode || (slot && slot[0])\n    }\n  };\n\n  var builtInComponents = {\n    KeepAlive: KeepAlive\n  };\n\n  /*  */\n\n  function initGlobalAPI (Vue) {\n    // config\n    var configDef = {};\n    configDef.get = function () { return config; };\n    {\n      configDef.set = function () {\n        warn(\n          'Do not replace the Vue.config object, set individual fields instead.'\n        );\n      };\n    }\n    Object.defineProperty(Vue, 'config', configDef);\n\n    // exposed util methods.\n    // NOTE: these are not considered part of the public API - avoid relying on\n    // them unless you are aware of the risk.\n    Vue.util = {\n      warn: warn,\n      extend: extend,\n      mergeOptions: mergeOptions,\n      defineReactive: defineReactive$$1\n    };\n\n    Vue.set = set;\n    Vue.delete = del;\n    Vue.nextTick = nextTick;\n\n    Vue.options = Object.create(null);\n    ASSET_TYPES.forEach(function (type) {\n      Vue.options[type + 's'] = Object.create(null);\n    });\n\n    // this is used to identify the \"base\" constructor to extend all plain-object\n    // components with in Weex's multi-instance scenarios.\n    Vue.options._base = Vue;\n\n    extend(Vue.options.components, builtInComponents);\n\n    initUse(Vue);\n    initMixin$1(Vue);\n    initExtend(Vue);\n    initAssetRegisters(Vue);\n  }\n\n  initGlobalAPI(Vue);\n\n  Object.defineProperty(Vue.prototype, '$isServer', {\n    get: isServerRendering\n  });\n\n  Object.defineProperty(Vue.prototype, '$ssrContext', {\n    get: function get () {\n      /* istanbul ignore next */\n      return this.$vnode && this.$vnode.ssrContext\n    }\n  });\n\n  // expose FunctionalRenderContext for ssr runtime helper installation\n  Object.defineProperty(Vue, 'FunctionalRenderContext', {\n    value: FunctionalRenderContext\n  });\n\n  Vue.version = '2.5.22';\n\n  /*  */\n\n  // these are reserved for web because they are directly compiled away\n  // during template compilation\n  var isReservedAttr = makeMap('style,class');\n\n  // attributes that should be using props for binding\n  var acceptValue = makeMap('input,textarea,option,select,progress');\n  var mustUseProp = function (tag, type, attr) {\n    return (\n      (attr === 'value' && acceptValue(tag)) && type !== 'button' ||\n      (attr === 'selected' && tag === 'option') ||\n      (attr === 'checked' && tag === 'input') ||\n      (attr === 'muted' && tag === 'video')\n    )\n  };\n\n  var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');\n\n  var isBooleanAttr = makeMap(\n    'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +\n    'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +\n    'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +\n    'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +\n    'required,reversed,scoped,seamless,selected,sortable,translate,' +\n    'truespeed,typemustmatch,visible'\n  );\n\n  var xlinkNS = 'http://www.w3.org/1999/xlink';\n\n  var isXlink = function (name) {\n    return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'\n  };\n\n  var getXlinkProp = function (name) {\n    return isXlink(name) ? name.slice(6, name.length) : ''\n  };\n\n  var isFalsyAttrValue = function (val) {\n    return val == null || val === false\n  };\n\n  /*  */\n\n  function genClassForVnode (vnode) {\n    var data = vnode.data;\n    var parentNode = vnode;\n    var childNode = vnode;\n    while (isDef(childNode.componentInstance)) {\n      childNode = childNode.componentInstance._vnode;\n      if (childNode && childNode.data) {\n        data = mergeClassData(childNode.data, data);\n      }\n    }\n    while (isDef(parentNode = parentNode.parent)) {\n      if (parentNode && parentNode.data) {\n        data = mergeClassData(data, parentNode.data);\n      }\n    }\n    return renderClass(data.staticClass, data.class)\n  }\n\n  function mergeClassData (child, parent) {\n    return {\n      staticClass: concat(child.staticClass, parent.staticClass),\n      class: isDef(child.class)\n        ? [child.class, parent.class]\n        : parent.class\n    }\n  }\n\n  function renderClass (\n    staticClass,\n    dynamicClass\n  ) {\n    if (isDef(staticClass) || isDef(dynamicClass)) {\n      return concat(staticClass, stringifyClass(dynamicClass))\n    }\n    /* istanbul ignore next */\n    return ''\n  }\n\n  function concat (a, b) {\n    return a ? b ? (a + ' ' + b) : a : (b || '')\n  }\n\n  function stringifyClass (value) {\n    if (Array.isArray(value)) {\n      return stringifyArray(value)\n    }\n    if (isObject(value)) {\n      return stringifyObject(value)\n    }\n    if (typeof value === 'string') {\n      return value\n    }\n    /* istanbul ignore next */\n    return ''\n  }\n\n  function stringifyArray (value) {\n    var res = '';\n    var stringified;\n    for (var i = 0, l = value.length; i < l; i++) {\n      if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {\n        if (res) { res += ' '; }\n        res += stringified;\n      }\n    }\n    return res\n  }\n\n  function stringifyObject (value) {\n    var res = '';\n    for (var key in value) {\n      if (value[key]) {\n        if (res) { res += ' '; }\n        res += key;\n      }\n    }\n    return res\n  }\n\n  /*  */\n\n  var namespaceMap = {\n    svg: 'http://www.w3.org/2000/svg',\n    math: 'http://www.w3.org/1998/Math/MathML'\n  };\n\n  var isHTMLTag = makeMap(\n    'html,body,base,head,link,meta,style,title,' +\n    'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +\n    'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +\n    'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +\n    's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +\n    'embed,object,param,source,canvas,script,noscript,del,ins,' +\n    'caption,col,colgroup,table,thead,tbody,td,th,tr,' +\n    'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +\n    'output,progress,select,textarea,' +\n    'details,dialog,menu,menuitem,summary,' +\n    'content,element,shadow,template,blockquote,iframe,tfoot'\n  );\n\n  // this map is intentionally selective, only covering SVG elements that may\n  // contain child elements.\n  var isSVG = makeMap(\n    'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +\n    'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +\n    'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',\n    true\n  );\n\n  var isPreTag = function (tag) { return tag === 'pre'; };\n\n  var isReservedTag = function (tag) {\n    return isHTMLTag(tag) || isSVG(tag)\n  };\n\n  function getTagNamespace (tag) {\n    if (isSVG(tag)) {\n      return 'svg'\n    }\n    // basic support for MathML\n    // note it doesn't support other MathML elements being component roots\n    if (tag === 'math') {\n      return 'math'\n    }\n  }\n\n  var unknownElementCache = Object.create(null);\n  function isUnknownElement (tag) {\n    /* istanbul ignore if */\n    if (!inBrowser) {\n      return true\n    }\n    if (isReservedTag(tag)) {\n      return false\n    }\n    tag = tag.toLowerCase();\n    /* istanbul ignore if */\n    if (unknownElementCache[tag] != null) {\n      return unknownElementCache[tag]\n    }\n    var el = document.createElement(tag);\n    if (tag.indexOf('-') > -1) {\n      // http://stackoverflow.com/a/28210364/1070244\n      return (unknownElementCache[tag] = (\n        el.constructor === window.HTMLUnknownElement ||\n        el.constructor === window.HTMLElement\n      ))\n    } else {\n      return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))\n    }\n  }\n\n  var isTextInputType = makeMap('text,number,password,search,email,tel,url');\n\n  /*  */\n\n  /**\n   * Query an element selector if it's not an element already.\n   */\n  function query (el) {\n    if (typeof el === 'string') {\n      var selected = document.querySelector(el);\n      if (!selected) {\n        warn(\n          'Cannot find element: ' + el\n        );\n        return document.createElement('div')\n      }\n      return selected\n    } else {\n      return el\n    }\n  }\n\n  /*  */\n\n  function createElement$1 (tagName, vnode) {\n    var elm = document.createElement(tagName);\n    if (tagName !== 'select') {\n      return elm\n    }\n    // false or null will remove the attribute but undefined will not\n    if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {\n      elm.setAttribute('multiple', 'multiple');\n    }\n    return elm\n  }\n\n  function createElementNS (namespace, tagName) {\n    return document.createElementNS(namespaceMap[namespace], tagName)\n  }\n\n  function createTextNode (text) {\n    return document.createTextNode(text)\n  }\n\n  function createComment (text) {\n    return document.createComment(text)\n  }\n\n  function insertBefore (parentNode, newNode, referenceNode) {\n    parentNode.insertBefore(newNode, referenceNode);\n  }\n\n  function removeChild (node, child) {\n    node.removeChild(child);\n  }\n\n  function appendChild (node, child) {\n    node.appendChild(child);\n  }\n\n  function parentNode (node) {\n    return node.parentNode\n  }\n\n  function nextSibling (node) {\n    return node.nextSibling\n  }\n\n  function tagName (node) {\n    return node.tagName\n  }\n\n  function setTextContent (node, text) {\n    node.textContent = text;\n  }\n\n  function setStyleScope (node, scopeId) {\n    node.setAttribute(scopeId, '');\n  }\n\n  var nodeOps = /*#__PURE__*/Object.freeze({\n    createElement: createElement$1,\n    createElementNS: createElementNS,\n    createTextNode: createTextNode,\n    createComment: createComment,\n    insertBefore: insertBefore,\n    removeChild: removeChild,\n    appendChild: appendChild,\n    parentNode: parentNode,\n    nextSibling: nextSibling,\n    tagName: tagName,\n    setTextContent: setTextContent,\n    setStyleScope: setStyleScope\n  });\n\n  /*  */\n\n  var ref = {\n    create: function create (_, vnode) {\n      registerRef(vnode);\n    },\n    update: function update (oldVnode, vnode) {\n      if (oldVnode.data.ref !== vnode.data.ref) {\n        registerRef(oldVnode, true);\n        registerRef(vnode);\n      }\n    },\n    destroy: function destroy (vnode) {\n      registerRef(vnode, true);\n    }\n  };\n\n  function registerRef (vnode, isRemoval) {\n    var key = vnode.data.ref;\n    if (!isDef(key)) { return }\n\n    var vm = vnode.context;\n    var ref = vnode.componentInstance || vnode.elm;\n    var refs = vm.$refs;\n    if (isRemoval) {\n      if (Array.isArray(refs[key])) {\n        remove(refs[key], ref);\n      } else if (refs[key] === ref) {\n        refs[key] = undefined;\n      }\n    } else {\n      if (vnode.data.refInFor) {\n        if (!Array.isArray(refs[key])) {\n          refs[key] = [ref];\n        } else if (refs[key].indexOf(ref) < 0) {\n          // $flow-disable-line\n          refs[key].push(ref);\n        }\n      } else {\n        refs[key] = ref;\n      }\n    }\n  }\n\n  /**\n   * Virtual DOM patching algorithm based on Snabbdom by\n   * Simon Friis Vindum (@paldepind)\n   * Licensed under the MIT License\n   * https://github.com/paldepind/snabbdom/blob/master/LICENSE\n   *\n   * modified by Evan You (@yyx990803)\n   *\n   * Not type-checking this because this file is perf-critical and the cost\n   * of making flow understand it is not worth it.\n   */\n\n  var emptyNode = new VNode('', {}, []);\n\n  var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];\n\n  function sameVnode (a, b) {\n    return (\n      a.key === b.key && (\n        (\n          a.tag === b.tag &&\n          a.isComment === b.isComment &&\n          isDef(a.data) === isDef(b.data) &&\n          sameInputType(a, b)\n        ) || (\n          isTrue(a.isAsyncPlaceholder) &&\n          a.asyncFactory === b.asyncFactory &&\n          isUndef(b.asyncFactory.error)\n        )\n      )\n    )\n  }\n\n  function sameInputType (a, b) {\n    if (a.tag !== 'input') { return true }\n    var i;\n    var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;\n    var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;\n    return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)\n  }\n\n  function createKeyToOldIdx (children, beginIdx, endIdx) {\n    var i, key;\n    var map = {};\n    for (i = beginIdx; i <= endIdx; ++i) {\n      key = children[i].key;\n      if (isDef(key)) { map[key] = i; }\n    }\n    return map\n  }\n\n  function createPatchFunction (backend) {\n    var i, j;\n    var cbs = {};\n\n    var modules = backend.modules;\n    var nodeOps = backend.nodeOps;\n\n    for (i = 0; i < hooks.length; ++i) {\n      cbs[hooks[i]] = [];\n      for (j = 0; j < modules.length; ++j) {\n        if (isDef(modules[j][hooks[i]])) {\n          cbs[hooks[i]].push(modules[j][hooks[i]]);\n        }\n      }\n    }\n\n    function emptyNodeAt (elm) {\n      return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)\n    }\n\n    function createRmCb (childElm, listeners) {\n      function remove$$1 () {\n        if (--remove$$1.listeners === 0) {\n          removeNode(childElm);\n        }\n      }\n      remove$$1.listeners = listeners;\n      return remove$$1\n    }\n\n    function removeNode (el) {\n      var parent = nodeOps.parentNode(el);\n      // element may have already been removed due to v-html / v-text\n      if (isDef(parent)) {\n        nodeOps.removeChild(parent, el);\n      }\n    }\n\n    function isUnknownElement$$1 (vnode, inVPre) {\n      return (\n        !inVPre &&\n        !vnode.ns &&\n        !(\n          config.ignoredElements.length &&\n          config.ignoredElements.some(function (ignore) {\n            return isRegExp(ignore)\n              ? ignore.test(vnode.tag)\n              : ignore === vnode.tag\n          })\n        ) &&\n        config.isUnknownElement(vnode.tag)\n      )\n    }\n\n    var creatingElmInVPre = 0;\n\n    function createElm (\n      vnode,\n      insertedVnodeQueue,\n      parentElm,\n      refElm,\n      nested,\n      ownerArray,\n      index\n    ) {\n      if (isDef(vnode.elm) && isDef(ownerArray)) {\n        // This vnode was used in a previous render!\n        // now it's used as a new node, overwriting its elm would cause\n        // potential patch errors down the road when it's used as an insertion\n        // reference node. Instead, we clone the node on-demand before creating\n        // associated DOM element for it.\n        vnode = ownerArray[index] = cloneVNode(vnode);\n      }\n\n      vnode.isRootInsert = !nested; // for transition enter check\n      if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {\n        return\n      }\n\n      var data = vnode.data;\n      var children = vnode.children;\n      var tag = vnode.tag;\n      if (isDef(tag)) {\n        {\n          if (data && data.pre) {\n            creatingElmInVPre++;\n          }\n          if (isUnknownElement$$1(vnode, creatingElmInVPre)) {\n            warn(\n              'Unknown custom element: <' + tag + '> - did you ' +\n              'register the component correctly? For recursive components, ' +\n              'make sure to provide the \"name\" option.',\n              vnode.context\n            );\n          }\n        }\n\n        vnode.elm = vnode.ns\n          ? nodeOps.createElementNS(vnode.ns, tag)\n          : nodeOps.createElement(tag, vnode);\n        setScope(vnode);\n\n        /* istanbul ignore if */\n        {\n          createChildren(vnode, children, insertedVnodeQueue);\n          if (isDef(data)) {\n            invokeCreateHooks(vnode, insertedVnodeQueue);\n          }\n          insert(parentElm, vnode.elm, refElm);\n        }\n\n        if (data && data.pre) {\n          creatingElmInVPre--;\n        }\n      } else if (isTrue(vnode.isComment)) {\n        vnode.elm = nodeOps.createComment(vnode.text);\n        insert(parentElm, vnode.elm, refElm);\n      } else {\n        vnode.elm = nodeOps.createTextNode(vnode.text);\n        insert(parentElm, vnode.elm, refElm);\n      }\n    }\n\n    function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {\n      var i = vnode.data;\n      if (isDef(i)) {\n        var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;\n        if (isDef(i = i.hook) && isDef(i = i.init)) {\n          i(vnode, false /* hydrating */);\n        }\n        // after calling the init hook, if the vnode is a child component\n        // it should've created a child instance and mounted it. the child\n        // component also has set the placeholder vnode's elm.\n        // in that case we can just return the element and be done.\n        if (isDef(vnode.componentInstance)) {\n          initComponent(vnode, insertedVnodeQueue);\n          insert(parentElm, vnode.elm, refElm);\n          if (isTrue(isReactivated)) {\n            reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);\n          }\n          return true\n        }\n      }\n    }\n\n    function initComponent (vnode, insertedVnodeQueue) {\n      if (isDef(vnode.data.pendingInsert)) {\n        insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);\n        vnode.data.pendingInsert = null;\n      }\n      vnode.elm = vnode.componentInstance.$el;\n      if (isPatchable(vnode)) {\n        invokeCreateHooks(vnode, insertedVnodeQueue);\n        setScope(vnode);\n      } else {\n        // empty component root.\n        // skip all element-related modules except for ref (#3455)\n        registerRef(vnode);\n        // make sure to invoke the insert hook\n        insertedVnodeQueue.push(vnode);\n      }\n    }\n\n    function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {\n      var i;\n      // hack for #4339: a reactivated component with inner transition\n      // does not trigger because the inner node's created hooks are not called\n      // again. It's not ideal to involve module-specific logic in here but\n      // there doesn't seem to be a better way to do it.\n      var innerNode = vnode;\n      while (innerNode.componentInstance) {\n        innerNode = innerNode.componentInstance._vnode;\n        if (isDef(i = innerNode.data) && isDef(i = i.transition)) {\n          for (i = 0; i < cbs.activate.length; ++i) {\n            cbs.activate[i](emptyNode, innerNode);\n          }\n          insertedVnodeQueue.push(innerNode);\n          break\n        }\n      }\n      // unlike a newly created component,\n      // a reactivated keep-alive component doesn't insert itself\n      insert(parentElm, vnode.elm, refElm);\n    }\n\n    function insert (parent, elm, ref$$1) {\n      if (isDef(parent)) {\n        if (isDef(ref$$1)) {\n          if (nodeOps.parentNode(ref$$1) === parent) {\n            nodeOps.insertBefore(parent, elm, ref$$1);\n          }\n        } else {\n          nodeOps.appendChild(parent, elm);\n        }\n      }\n    }\n\n    function createChildren (vnode, children, insertedVnodeQueue) {\n      if (Array.isArray(children)) {\n        {\n          checkDuplicateKeys(children);\n        }\n        for (var i = 0; i < children.length; ++i) {\n          createElm(children[i], insertedVnodeQueue, vnode.elm, null, true, children, i);\n        }\n      } else if (isPrimitive(vnode.text)) {\n        nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(String(vnode.text)));\n      }\n    }\n\n    function isPatchable (vnode) {\n      while (vnode.componentInstance) {\n        vnode = vnode.componentInstance._vnode;\n      }\n      return isDef(vnode.tag)\n    }\n\n    function invokeCreateHooks (vnode, insertedVnodeQueue) {\n      for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {\n        cbs.create[i$1](emptyNode, vnode);\n      }\n      i = vnode.data.hook; // Reuse variable\n      if (isDef(i)) {\n        if (isDef(i.create)) { i.create(emptyNode, vnode); }\n        if (isDef(i.insert)) { insertedVnodeQueue.push(vnode); }\n      }\n    }\n\n    // set scope id attribute for scoped CSS.\n    // this is implemented as a special case to avoid the overhead\n    // of going through the normal attribute patching process.\n    function setScope (vnode) {\n      var i;\n      if (isDef(i = vnode.fnScopeId)) {\n        nodeOps.setStyleScope(vnode.elm, i);\n      } else {\n        var ancestor = vnode;\n        while (ancestor) {\n          if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {\n            nodeOps.setStyleScope(vnode.elm, i);\n          }\n          ancestor = ancestor.parent;\n        }\n      }\n      // for slot content they should also get the scopeId from the host instance.\n      if (isDef(i = activeInstance) &&\n        i !== vnode.context &&\n        i !== vnode.fnContext &&\n        isDef(i = i.$options._scopeId)\n      ) {\n        nodeOps.setStyleScope(vnode.elm, i);\n      }\n    }\n\n    function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {\n      for (; startIdx <= endIdx; ++startIdx) {\n        createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm, false, vnodes, startIdx);\n      }\n    }\n\n    function invokeDestroyHook (vnode) {\n      var i, j;\n      var data = vnode.data;\n      if (isDef(data)) {\n        if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }\n        for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }\n      }\n      if (isDef(i = vnode.children)) {\n        for (j = 0; j < vnode.children.length; ++j) {\n          invokeDestroyHook(vnode.children[j]);\n        }\n      }\n    }\n\n    function removeVnodes (parentElm, vnodes, startIdx, endIdx) {\n      for (; startIdx <= endIdx; ++startIdx) {\n        var ch = vnodes[startIdx];\n        if (isDef(ch)) {\n          if (isDef(ch.tag)) {\n            removeAndInvokeRemoveHook(ch);\n            invokeDestroyHook(ch);\n          } else { // Text node\n            removeNode(ch.elm);\n          }\n        }\n      }\n    }\n\n    function removeAndInvokeRemoveHook (vnode, rm) {\n      if (isDef(rm) || isDef(vnode.data)) {\n        var i;\n        var listeners = cbs.remove.length + 1;\n        if (isDef(rm)) {\n          // we have a recursively passed down rm callback\n          // increase the listeners count\n          rm.listeners += listeners;\n        } else {\n          // directly removing\n          rm = createRmCb(vnode.elm, listeners);\n        }\n        // recursively invoke hooks on child component root node\n        if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {\n          removeAndInvokeRemoveHook(i, rm);\n        }\n        for (i = 0; i < cbs.remove.length; ++i) {\n          cbs.remove[i](vnode, rm);\n        }\n        if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {\n          i(vnode, rm);\n        } else {\n          rm();\n        }\n      } else {\n        removeNode(vnode.elm);\n      }\n    }\n\n    function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {\n      var oldStartIdx = 0;\n      var newStartIdx = 0;\n      var oldEndIdx = oldCh.length - 1;\n      var oldStartVnode = oldCh[0];\n      var oldEndVnode = oldCh[oldEndIdx];\n      var newEndIdx = newCh.length - 1;\n      var newStartVnode = newCh[0];\n      var newEndVnode = newCh[newEndIdx];\n      var oldKeyToIdx, idxInOld, vnodeToMove, refElm;\n\n      // removeOnly is a special flag used only by <transition-group>\n      // to ensure removed elements stay in correct relative positions\n      // during leaving transitions\n      var canMove = !removeOnly;\n\n      {\n        checkDuplicateKeys(newCh);\n      }\n\n      while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {\n        if (isUndef(oldStartVnode)) {\n          oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left\n        } else if (isUndef(oldEndVnode)) {\n          oldEndVnode = oldCh[--oldEndIdx];\n        } else if (sameVnode(oldStartVnode, newStartVnode)) {\n          patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);\n          oldStartVnode = oldCh[++oldStartIdx];\n          newStartVnode = newCh[++newStartIdx];\n        } else if (sameVnode(oldEndVnode, newEndVnode)) {\n          patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);\n          oldEndVnode = oldCh[--oldEndIdx];\n          newEndVnode = newCh[--newEndIdx];\n        } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right\n          patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);\n          canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));\n          oldStartVnode = oldCh[++oldStartIdx];\n          newEndVnode = newCh[--newEndIdx];\n        } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left\n          patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);\n          canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);\n          oldEndVnode = oldCh[--oldEndIdx];\n          newStartVnode = newCh[++newStartIdx];\n        } else {\n          if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }\n          idxInOld = isDef(newStartVnode.key)\n            ? oldKeyToIdx[newStartVnode.key]\n            : findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);\n          if (isUndef(idxInOld)) { // New element\n            createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);\n          } else {\n            vnodeToMove = oldCh[idxInOld];\n            if (sameVnode(vnodeToMove, newStartVnode)) {\n              patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);\n              oldCh[idxInOld] = undefined;\n              canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);\n            } else {\n              // same key but different element. treat as new element\n              createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);\n            }\n          }\n          newStartVnode = newCh[++newStartIdx];\n        }\n      }\n      if (oldStartIdx > oldEndIdx) {\n        refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;\n        addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);\n      } else if (newStartIdx > newEndIdx) {\n        removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);\n      }\n    }\n\n    function checkDuplicateKeys (children) {\n      var seenKeys = {};\n      for (var i = 0; i < children.length; i++) {\n        var vnode = children[i];\n        var key = vnode.key;\n        if (isDef(key)) {\n          if (seenKeys[key]) {\n            warn(\n              (\"Duplicate keys detected: '\" + key + \"'. This may cause an update error.\"),\n              vnode.context\n            );\n          } else {\n            seenKeys[key] = true;\n          }\n        }\n      }\n    }\n\n    function findIdxInOld (node, oldCh, start, end) {\n      for (var i = start; i < end; i++) {\n        var c = oldCh[i];\n        if (isDef(c) && sameVnode(node, c)) { return i }\n      }\n    }\n\n    function patchVnode (\n      oldVnode,\n      vnode,\n      insertedVnodeQueue,\n      ownerArray,\n      index,\n      removeOnly\n    ) {\n      if (oldVnode === vnode) {\n        return\n      }\n\n      if (isDef(vnode.elm) && isDef(ownerArray)) {\n        // clone reused vnode\n        vnode = ownerArray[index] = cloneVNode(vnode);\n      }\n\n      var elm = vnode.elm = oldVnode.elm;\n\n      if (isTrue(oldVnode.isAsyncPlaceholder)) {\n        if (isDef(vnode.asyncFactory.resolved)) {\n          hydrate(oldVnode.elm, vnode, insertedVnodeQueue);\n        } else {\n          vnode.isAsyncPlaceholder = true;\n        }\n        return\n      }\n\n      // reuse element for static trees.\n      // note we only do this if the vnode is cloned -\n      // if the new node is not cloned it means the render functions have been\n      // reset by the hot-reload-api and we need to do a proper re-render.\n      if (isTrue(vnode.isStatic) &&\n        isTrue(oldVnode.isStatic) &&\n        vnode.key === oldVnode.key &&\n        (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))\n      ) {\n        vnode.componentInstance = oldVnode.componentInstance;\n        return\n      }\n\n      var i;\n      var data = vnode.data;\n      if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {\n        i(oldVnode, vnode);\n      }\n\n      var oldCh = oldVnode.children;\n      var ch = vnode.children;\n      if (isDef(data) && isPatchable(vnode)) {\n        for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }\n        if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }\n      }\n      if (isUndef(vnode.text)) {\n        if (isDef(oldCh) && isDef(ch)) {\n          if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }\n        } else if (isDef(ch)) {\n          {\n            checkDuplicateKeys(ch);\n          }\n          if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }\n          addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);\n        } else if (isDef(oldCh)) {\n          removeVnodes(elm, oldCh, 0, oldCh.length - 1);\n        } else if (isDef(oldVnode.text)) {\n          nodeOps.setTextContent(elm, '');\n        }\n      } else if (oldVnode.text !== vnode.text) {\n        nodeOps.setTextContent(elm, vnode.text);\n      }\n      if (isDef(data)) {\n        if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }\n      }\n    }\n\n    function invokeInsertHook (vnode, queue, initial) {\n      // delay insert hooks for component root nodes, invoke them after the\n      // element is really inserted\n      if (isTrue(initial) && isDef(vnode.parent)) {\n        vnode.parent.data.pendingInsert = queue;\n      } else {\n        for (var i = 0; i < queue.length; ++i) {\n          queue[i].data.hook.insert(queue[i]);\n        }\n      }\n    }\n\n    var hydrationBailed = false;\n    // list of modules that can skip create hook during hydration because they\n    // are already rendered on the client or has no need for initialization\n    // Note: style is excluded because it relies on initial clone for future\n    // deep updates (#7063).\n    var isRenderedModule = makeMap('attrs,class,staticClass,staticStyle,key');\n\n    // Note: this is a browser-only function so we can assume elms are DOM nodes.\n    function hydrate (elm, vnode, insertedVnodeQueue, inVPre) {\n      var i;\n      var tag = vnode.tag;\n      var data = vnode.data;\n      var children = vnode.children;\n      inVPre = inVPre || (data && data.pre);\n      vnode.elm = elm;\n\n      if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {\n        vnode.isAsyncPlaceholder = true;\n        return true\n      }\n      // assert node match\n      {\n        if (!assertNodeMatch(elm, vnode, inVPre)) {\n          return false\n        }\n      }\n      if (isDef(data)) {\n        if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }\n        if (isDef(i = vnode.componentInstance)) {\n          // child component. it should have hydrated its own tree.\n          initComponent(vnode, insertedVnodeQueue);\n          return true\n        }\n      }\n      if (isDef(tag)) {\n        if (isDef(children)) {\n          // empty element, allow client to pick up and populate children\n          if (!elm.hasChildNodes()) {\n            createChildren(vnode, children, insertedVnodeQueue);\n          } else {\n            // v-html and domProps: innerHTML\n            if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {\n              if (i !== elm.innerHTML) {\n                /* istanbul ignore if */\n                if (typeof console !== 'undefined' &&\n                  !hydrationBailed\n                ) {\n                  hydrationBailed = true;\n                  console.warn('Parent: ', elm);\n                  console.warn('server innerHTML: ', i);\n                  console.warn('client innerHTML: ', elm.innerHTML);\n                }\n                return false\n              }\n            } else {\n              // iterate and compare children lists\n              var childrenMatch = true;\n              var childNode = elm.firstChild;\n              for (var i$1 = 0; i$1 < children.length; i$1++) {\n                if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue, inVPre)) {\n                  childrenMatch = false;\n                  break\n                }\n                childNode = childNode.nextSibling;\n              }\n              // if childNode is not null, it means the actual childNodes list is\n              // longer than the virtual children list.\n              if (!childrenMatch || childNode) {\n                /* istanbul ignore if */\n                if (typeof console !== 'undefined' &&\n                  !hydrationBailed\n                ) {\n                  hydrationBailed = true;\n                  console.warn('Parent: ', elm);\n                  console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);\n                }\n                return false\n              }\n            }\n          }\n        }\n        if (isDef(data)) {\n          var fullInvoke = false;\n          for (var key in data) {\n            if (!isRenderedModule(key)) {\n              fullInvoke = true;\n              invokeCreateHooks(vnode, insertedVnodeQueue);\n              break\n            }\n          }\n          if (!fullInvoke && data['class']) {\n            // ensure collecting deps for deep class bindings for future updates\n            traverse(data['class']);\n          }\n        }\n      } else if (elm.data !== vnode.text) {\n        elm.data = vnode.text;\n      }\n      return true\n    }\n\n    function assertNodeMatch (node, vnode, inVPre) {\n      if (isDef(vnode.tag)) {\n        return vnode.tag.indexOf('vue-component') === 0 || (\n          !isUnknownElement$$1(vnode, inVPre) &&\n          vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())\n        )\n      } else {\n        return node.nodeType === (vnode.isComment ? 8 : 3)\n      }\n    }\n\n    return function patch (oldVnode, vnode, hydrating, removeOnly) {\n      if (isUndef(vnode)) {\n        if (isDef(oldVnode)) { invokeDestroyHook(oldVnode); }\n        return\n      }\n\n      var isInitialPatch = false;\n      var insertedVnodeQueue = [];\n\n      if (isUndef(oldVnode)) {\n        // empty mount (likely as component), create new root element\n        isInitialPatch = true;\n        createElm(vnode, insertedVnodeQueue);\n      } else {\n        var isRealElement = isDef(oldVnode.nodeType);\n        if (!isRealElement && sameVnode(oldVnode, vnode)) {\n          // patch existing root node\n          patchVnode(oldVnode, vnode, insertedVnodeQueue, null, null, removeOnly);\n        } else {\n          if (isRealElement) {\n            // mounting to a real element\n            // check if this is server-rendered content and if we can perform\n            // a successful hydration.\n            if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {\n              oldVnode.removeAttribute(SSR_ATTR);\n              hydrating = true;\n            }\n            if (isTrue(hydrating)) {\n              if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {\n                invokeInsertHook(vnode, insertedVnodeQueue, true);\n                return oldVnode\n              } else {\n                warn(\n                  'The client-side rendered virtual DOM tree is not matching ' +\n                  'server-rendered content. This is likely caused by incorrect ' +\n                  'HTML markup, for example nesting block-level elements inside ' +\n                  '<p>, or missing <tbody>. Bailing hydration and performing ' +\n                  'full client-side render.'\n                );\n              }\n            }\n            // either not server-rendered, or hydration failed.\n            // create an empty node and replace it\n            oldVnode = emptyNodeAt(oldVnode);\n          }\n\n          // replacing existing element\n          var oldElm = oldVnode.elm;\n          var parentElm = nodeOps.parentNode(oldElm);\n\n          // create new node\n          createElm(\n            vnode,\n            insertedVnodeQueue,\n            // extremely rare edge case: do not insert if old element is in a\n            // leaving transition. Only happens when combining transition +\n            // keep-alive + HOCs. (#4590)\n            oldElm._leaveCb ? null : parentElm,\n            nodeOps.nextSibling(oldElm)\n          );\n\n          // update parent placeholder node element, recursively\n          if (isDef(vnode.parent)) {\n            var ancestor = vnode.parent;\n            var patchable = isPatchable(vnode);\n            while (ancestor) {\n              for (var i = 0; i < cbs.destroy.length; ++i) {\n                cbs.destroy[i](ancestor);\n              }\n              ancestor.elm = vnode.elm;\n              if (patchable) {\n                for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {\n                  cbs.create[i$1](emptyNode, ancestor);\n                }\n                // #6513\n                // invoke insert hooks that may have been merged by create hooks.\n                // e.g. for directives that uses the \"inserted\" hook.\n                var insert = ancestor.data.hook.insert;\n                if (insert.merged) {\n                  // start at index 1 to avoid re-invoking component mounted hook\n                  for (var i$2 = 1; i$2 < insert.fns.length; i$2++) {\n                    insert.fns[i$2]();\n                  }\n                }\n              } else {\n                registerRef(ancestor);\n              }\n              ancestor = ancestor.parent;\n            }\n          }\n\n          // destroy old node\n          if (isDef(parentElm)) {\n            removeVnodes(parentElm, [oldVnode], 0, 0);\n          } else if (isDef(oldVnode.tag)) {\n            invokeDestroyHook(oldVnode);\n          }\n        }\n      }\n\n      invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);\n      return vnode.elm\n    }\n  }\n\n  /*  */\n\n  var directives = {\n    create: updateDirectives,\n    update: updateDirectives,\n    destroy: function unbindDirectives (vnode) {\n      updateDirectives(vnode, emptyNode);\n    }\n  };\n\n  function updateDirectives (oldVnode, vnode) {\n    if (oldVnode.data.directives || vnode.data.directives) {\n      _update(oldVnode, vnode);\n    }\n  }\n\n  function _update (oldVnode, vnode) {\n    var isCreate = oldVnode === emptyNode;\n    var isDestroy = vnode === emptyNode;\n    var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);\n    var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);\n\n    var dirsWithInsert = [];\n    var dirsWithPostpatch = [];\n\n    var key, oldDir, dir;\n    for (key in newDirs) {\n      oldDir = oldDirs[key];\n      dir = newDirs[key];\n      if (!oldDir) {\n        // new directive, bind\n        callHook$1(dir, 'bind', vnode, oldVnode);\n        if (dir.def && dir.def.inserted) {\n          dirsWithInsert.push(dir);\n        }\n      } else {\n        // existing directive, update\n        dir.oldValue = oldDir.value;\n        callHook$1(dir, 'update', vnode, oldVnode);\n        if (dir.def && dir.def.componentUpdated) {\n          dirsWithPostpatch.push(dir);\n        }\n      }\n    }\n\n    if (dirsWithInsert.length) {\n      var callInsert = function () {\n        for (var i = 0; i < dirsWithInsert.length; i++) {\n          callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);\n        }\n      };\n      if (isCreate) {\n        mergeVNodeHook(vnode, 'insert', callInsert);\n      } else {\n        callInsert();\n      }\n    }\n\n    if (dirsWithPostpatch.length) {\n      mergeVNodeHook(vnode, 'postpatch', function () {\n        for (var i = 0; i < dirsWithPostpatch.length; i++) {\n          callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);\n        }\n      });\n    }\n\n    if (!isCreate) {\n      for (key in oldDirs) {\n        if (!newDirs[key]) {\n          // no longer present, unbind\n          callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);\n        }\n      }\n    }\n  }\n\n  var emptyModifiers = Object.create(null);\n\n  function normalizeDirectives$1 (\n    dirs,\n    vm\n  ) {\n    var res = Object.create(null);\n    if (!dirs) {\n      // $flow-disable-line\n      return res\n    }\n    var i, dir;\n    for (i = 0; i < dirs.length; i++) {\n      dir = dirs[i];\n      if (!dir.modifiers) {\n        // $flow-disable-line\n        dir.modifiers = emptyModifiers;\n      }\n      res[getRawDirName(dir)] = dir;\n      dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);\n    }\n    // $flow-disable-line\n    return res\n  }\n\n  function getRawDirName (dir) {\n    return dir.rawName || ((dir.name) + \".\" + (Object.keys(dir.modifiers || {}).join('.')))\n  }\n\n  function callHook$1 (dir, hook, vnode, oldVnode, isDestroy) {\n    var fn = dir.def && dir.def[hook];\n    if (fn) {\n      try {\n        fn(vnode.elm, dir, vnode, oldVnode, isDestroy);\n      } catch (e) {\n        handleError(e, vnode.context, (\"directive \" + (dir.name) + \" \" + hook + \" hook\"));\n      }\n    }\n  }\n\n  var baseModules = [\n    ref,\n    directives\n  ];\n\n  /*  */\n\n  function updateAttrs (oldVnode, vnode) {\n    var opts = vnode.componentOptions;\n    if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {\n      return\n    }\n    if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {\n      return\n    }\n    var key, cur, old;\n    var elm = vnode.elm;\n    var oldAttrs = oldVnode.data.attrs || {};\n    var attrs = vnode.data.attrs || {};\n    // clone observed objects, as the user probably wants to mutate it\n    if (isDef(attrs.__ob__)) {\n      attrs = vnode.data.attrs = extend({}, attrs);\n    }\n\n    for (key in attrs) {\n      cur = attrs[key];\n      old = oldAttrs[key];\n      if (old !== cur) {\n        setAttr(elm, key, cur);\n      }\n    }\n    // #4391: in IE9, setting type can reset value for input[type=radio]\n    // #6666: IE/Edge forces progress value down to 1 before setting a max\n    /* istanbul ignore if */\n    if ((isIE || isEdge) && attrs.value !== oldAttrs.value) {\n      setAttr(elm, 'value', attrs.value);\n    }\n    for (key in oldAttrs) {\n      if (isUndef(attrs[key])) {\n        if (isXlink(key)) {\n          elm.removeAttributeNS(xlinkNS, getXlinkProp(key));\n        } else if (!isEnumeratedAttr(key)) {\n          elm.removeAttribute(key);\n        }\n      }\n    }\n  }\n\n  function setAttr (el, key, value) {\n    if (el.tagName.indexOf('-') > -1) {\n      baseSetAttr(el, key, value);\n    } else if (isBooleanAttr(key)) {\n      // set attribute for blank value\n      // e.g. <option disabled>Select one</option>\n      if (isFalsyAttrValue(value)) {\n        el.removeAttribute(key);\n      } else {\n        // technically allowfullscreen is a boolean attribute for <iframe>,\n        // but Flash expects a value of \"true\" when used on <embed> tag\n        value = key === 'allowfullscreen' && el.tagName === 'EMBED'\n          ? 'true'\n          : key;\n        el.setAttribute(key, value);\n      }\n    } else if (isEnumeratedAttr(key)) {\n      el.setAttribute(key, isFalsyAttrValue(value) || value === 'false' ? 'false' : 'true');\n    } else if (isXlink(key)) {\n      if (isFalsyAttrValue(value)) {\n        el.removeAttributeNS(xlinkNS, getXlinkProp(key));\n      } else {\n        el.setAttributeNS(xlinkNS, key, value);\n      }\n    } else {\n      baseSetAttr(el, key, value);\n    }\n  }\n\n  function baseSetAttr (el, key, value) {\n    if (isFalsyAttrValue(value)) {\n      el.removeAttribute(key);\n    } else {\n      // #7138: IE10 & 11 fires input event when setting placeholder on\n      // <textarea>... block the first input event and remove the blocker\n      // immediately.\n      /* istanbul ignore if */\n      if (\n        isIE && !isIE9 &&\n        (el.tagName === 'TEXTAREA' || el.tagName === 'INPUT') &&\n        key === 'placeholder' && !el.__ieph\n      ) {\n        var blocker = function (e) {\n          e.stopImmediatePropagation();\n          el.removeEventListener('input', blocker);\n        };\n        el.addEventListener('input', blocker);\n        // $flow-disable-line\n        el.__ieph = true; /* IE placeholder patched */\n      }\n      el.setAttribute(key, value);\n    }\n  }\n\n  var attrs = {\n    create: updateAttrs,\n    update: updateAttrs\n  };\n\n  /*  */\n\n  function updateClass (oldVnode, vnode) {\n    var el = vnode.elm;\n    var data = vnode.data;\n    var oldData = oldVnode.data;\n    if (\n      isUndef(data.staticClass) &&\n      isUndef(data.class) && (\n        isUndef(oldData) || (\n          isUndef(oldData.staticClass) &&\n          isUndef(oldData.class)\n        )\n      )\n    ) {\n      return\n    }\n\n    var cls = genClassForVnode(vnode);\n\n    // handle transition classes\n    var transitionClass = el._transitionClasses;\n    if (isDef(transitionClass)) {\n      cls = concat(cls, stringifyClass(transitionClass));\n    }\n\n    // set the class\n    if (cls !== el._prevClass) {\n      el.setAttribute('class', cls);\n      el._prevClass = cls;\n    }\n  }\n\n  var klass = {\n    create: updateClass,\n    update: updateClass\n  };\n\n  /*  */\n\n  var validDivisionCharRE = /[\\w).+\\-_$\\]]/;\n\n  function parseFilters (exp) {\n    var inSingle = false;\n    var inDouble = false;\n    var inTemplateString = false;\n    var inRegex = false;\n    var curly = 0;\n    var square = 0;\n    var paren = 0;\n    var lastFilterIndex = 0;\n    var c, prev, i, expression, filters;\n\n    for (i = 0; i < exp.length; i++) {\n      prev = c;\n      c = exp.charCodeAt(i);\n      if (inSingle) {\n        if (c === 0x27 && prev !== 0x5C) { inSingle = false; }\n      } else if (inDouble) {\n        if (c === 0x22 && prev !== 0x5C) { inDouble = false; }\n      } else if (inTemplateString) {\n        if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }\n      } else if (inRegex) {\n        if (c === 0x2f && prev !== 0x5C) { inRegex = false; }\n      } else if (\n        c === 0x7C && // pipe\n        exp.charCodeAt(i + 1) !== 0x7C &&\n        exp.charCodeAt(i - 1) !== 0x7C &&\n        !curly && !square && !paren\n      ) {\n        if (expression === undefined) {\n          // first filter, end of expression\n          lastFilterIndex = i + 1;\n          expression = exp.slice(0, i).trim();\n        } else {\n          pushFilter();\n        }\n      } else {\n        switch (c) {\n          case 0x22: inDouble = true; break         // \"\n          case 0x27: inSingle = true; break         // '\n          case 0x60: inTemplateString = true; break // `\n          case 0x28: paren++; break                 // (\n          case 0x29: paren--; break                 // )\n          case 0x5B: square++; break                // [\n          case 0x5D: square--; break                // ]\n          case 0x7B: curly++; break                 // {\n          case 0x7D: curly--; break                 // }\n        }\n        if (c === 0x2f) { // /\n          var j = i - 1;\n          var p = (void 0);\n          // find first non-whitespace prev char\n          for (; j >= 0; j--) {\n            p = exp.charAt(j);\n            if (p !== ' ') { break }\n          }\n          if (!p || !validDivisionCharRE.test(p)) {\n            inRegex = true;\n          }\n        }\n      }\n    }\n\n    if (expression === undefined) {\n      expression = exp.slice(0, i).trim();\n    } else if (lastFilterIndex !== 0) {\n      pushFilter();\n    }\n\n    function pushFilter () {\n      (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());\n      lastFilterIndex = i + 1;\n    }\n\n    if (filters) {\n      for (i = 0; i < filters.length; i++) {\n        expression = wrapFilter(expression, filters[i]);\n      }\n    }\n\n    return expression\n  }\n\n  function wrapFilter (exp, filter) {\n    var i = filter.indexOf('(');\n    if (i < 0) {\n      // _f: resolveFilter\n      return (\"_f(\\\"\" + filter + \"\\\")(\" + exp + \")\")\n    } else {\n      var name = filter.slice(0, i);\n      var args = filter.slice(i + 1);\n      return (\"_f(\\\"\" + name + \"\\\")(\" + exp + (args !== ')' ? ',' + args : args))\n    }\n  }\n\n  /*  */\n\n  function baseWarn (msg) {\n    console.error((\"[Vue compiler]: \" + msg));\n  }\n\n  function pluckModuleFunction (\n    modules,\n    key\n  ) {\n    return modules\n      ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })\n      : []\n  }\n\n  function addProp (el, name, value) {\n    (el.props || (el.props = [])).push({ name: name, value: value });\n    el.plain = false;\n  }\n\n  function addAttr (el, name, value) {\n    (el.attrs || (el.attrs = [])).push({ name: name, value: value });\n    el.plain = false;\n  }\n\n  // add a raw attr (use this in preTransforms)\n  function addRawAttr (el, name, value) {\n    el.attrsMap[name] = value;\n    el.attrsList.push({ name: name, value: value });\n  }\n\n  function addDirective (\n    el,\n    name,\n    rawName,\n    value,\n    arg,\n    modifiers\n  ) {\n    (el.directives || (el.directives = [])).push({ name: name, rawName: rawName, value: value, arg: arg, modifiers: modifiers });\n    el.plain = false;\n  }\n\n  function addHandler (\n    el,\n    name,\n    value,\n    modifiers,\n    important,\n    warn\n  ) {\n    modifiers = modifiers || emptyObject;\n    // warn prevent and passive modifier\n    /* istanbul ignore if */\n    if (\n      warn &&\n      modifiers.prevent && modifiers.passive\n    ) {\n      warn(\n        'passive and prevent can\\'t be used together. ' +\n        'Passive handler can\\'t prevent default event.'\n      );\n    }\n\n    // normalize click.right and click.middle since they don't actually fire\n    // this is technically browser-specific, but at least for now browsers are\n    // the only target envs that have right/middle clicks.\n    if (name === 'click') {\n      if (modifiers.right) {\n        name = 'contextmenu';\n        delete modifiers.right;\n      } else if (modifiers.middle) {\n        name = 'mouseup';\n      }\n    }\n\n    // check capture modifier\n    if (modifiers.capture) {\n      delete modifiers.capture;\n      name = '!' + name; // mark the event as captured\n    }\n    if (modifiers.once) {\n      delete modifiers.once;\n      name = '~' + name; // mark the event as once\n    }\n    /* istanbul ignore if */\n    if (modifiers.passive) {\n      delete modifiers.passive;\n      name = '&' + name; // mark the event as passive\n    }\n\n    var events;\n    if (modifiers.native) {\n      delete modifiers.native;\n      events = el.nativeEvents || (el.nativeEvents = {});\n    } else {\n      events = el.events || (el.events = {});\n    }\n\n    var newHandler = {\n      value: value.trim()\n    };\n    if (modifiers !== emptyObject) {\n      newHandler.modifiers = modifiers;\n    }\n\n    var handlers = events[name];\n    /* istanbul ignore if */\n    if (Array.isArray(handlers)) {\n      important ? handlers.unshift(newHandler) : handlers.push(newHandler);\n    } else if (handlers) {\n      events[name] = important ? [newHandler, handlers] : [handlers, newHandler];\n    } else {\n      events[name] = newHandler;\n    }\n\n    el.plain = false;\n  }\n\n  function getBindingAttr (\n    el,\n    name,\n    getStatic\n  ) {\n    var dynamicValue =\n      getAndRemoveAttr(el, ':' + name) ||\n      getAndRemoveAttr(el, 'v-bind:' + name);\n    if (dynamicValue != null) {\n      return parseFilters(dynamicValue)\n    } else if (getStatic !== false) {\n      var staticValue = getAndRemoveAttr(el, name);\n      if (staticValue != null) {\n        return JSON.stringify(staticValue)\n      }\n    }\n  }\n\n  // note: this only removes the attr from the Array (attrsList) so that it\n  // doesn't get processed by processAttrs.\n  // By default it does NOT remove it from the map (attrsMap) because the map is\n  // needed during codegen.\n  function getAndRemoveAttr (\n    el,\n    name,\n    removeFromMap\n  ) {\n    var val;\n    if ((val = el.attrsMap[name]) != null) {\n      var list = el.attrsList;\n      for (var i = 0, l = list.length; i < l; i++) {\n        if (list[i].name === name) {\n          list.splice(i, 1);\n          break\n        }\n      }\n    }\n    if (removeFromMap) {\n      delete el.attrsMap[name];\n    }\n    return val\n  }\n\n  /*  */\n\n  /**\n   * Cross-platform code generation for component v-model\n   */\n  function genComponentModel (\n    el,\n    value,\n    modifiers\n  ) {\n    var ref = modifiers || {};\n    var number = ref.number;\n    var trim = ref.trim;\n\n    var baseValueExpression = '$$v';\n    var valueExpression = baseValueExpression;\n    if (trim) {\n      valueExpression =\n        \"(typeof \" + baseValueExpression + \" === 'string'\" +\n        \"? \" + baseValueExpression + \".trim()\" +\n        \": \" + baseValueExpression + \")\";\n    }\n    if (number) {\n      valueExpression = \"_n(\" + valueExpression + \")\";\n    }\n    var assignment = genAssignmentCode(value, valueExpression);\n\n    el.model = {\n      value: (\"(\" + value + \")\"),\n      expression: JSON.stringify(value),\n      callback: (\"function (\" + baseValueExpression + \") {\" + assignment + \"}\")\n    };\n  }\n\n  /**\n   * Cross-platform codegen helper for generating v-model value assignment code.\n   */\n  function genAssignmentCode (\n    value,\n    assignment\n  ) {\n    var res = parseModel(value);\n    if (res.key === null) {\n      return (value + \"=\" + assignment)\n    } else {\n      return (\"$set(\" + (res.exp) + \", \" + (res.key) + \", \" + assignment + \")\")\n    }\n  }\n\n  /**\n   * Parse a v-model expression into a base path and a final key segment.\n   * Handles both dot-path and possible square brackets.\n   *\n   * Possible cases:\n   *\n   * - test\n   * - test[key]\n   * - test[test1[key]]\n   * - test[\"a\"][key]\n   * - xxx.test[a[a].test1[key]]\n   * - test.xxx.a[\"asa\"][test1[key]]\n   *\n   */\n\n  var len, str, chr, index$1, expressionPos, expressionEndPos;\n\n\n\n  function parseModel (val) {\n    // Fix https://github.com/vuejs/vue/pull/7730\n    // allow v-model=\"obj.val \" (trailing whitespace)\n    val = val.trim();\n    len = val.length;\n\n    if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {\n      index$1 = val.lastIndexOf('.');\n      if (index$1 > -1) {\n        return {\n          exp: val.slice(0, index$1),\n          key: '\"' + val.slice(index$1 + 1) + '\"'\n        }\n      } else {\n        return {\n          exp: val,\n          key: null\n        }\n      }\n    }\n\n    str = val;\n    index$1 = expressionPos = expressionEndPos = 0;\n\n    while (!eof()) {\n      chr = next();\n      /* istanbul ignore if */\n      if (isStringStart(chr)) {\n        parseString(chr);\n      } else if (chr === 0x5B) {\n        parseBracket(chr);\n      }\n    }\n\n    return {\n      exp: val.slice(0, expressionPos),\n      key: val.slice(expressionPos + 1, expressionEndPos)\n    }\n  }\n\n  function next () {\n    return str.charCodeAt(++index$1)\n  }\n\n  function eof () {\n    return index$1 >= len\n  }\n\n  function isStringStart (chr) {\n    return chr === 0x22 || chr === 0x27\n  }\n\n  function parseBracket (chr) {\n    var inBracket = 1;\n    expressionPos = index$1;\n    while (!eof()) {\n      chr = next();\n      if (isStringStart(chr)) {\n        parseString(chr);\n        continue\n      }\n      if (chr === 0x5B) { inBracket++; }\n      if (chr === 0x5D) { inBracket--; }\n      if (inBracket === 0) {\n        expressionEndPos = index$1;\n        break\n      }\n    }\n  }\n\n  function parseString (chr) {\n    var stringQuote = chr;\n    while (!eof()) {\n      chr = next();\n      if (chr === stringQuote) {\n        break\n      }\n    }\n  }\n\n  /*  */\n\n  var warn$1;\n\n  // in some cases, the event used has to be determined at runtime\n  // so we used some reserved tokens during compile.\n  var RANGE_TOKEN = '__r';\n  var CHECKBOX_RADIO_TOKEN = '__c';\n\n  function model (\n    el,\n    dir,\n    _warn\n  ) {\n    warn$1 = _warn;\n    var value = dir.value;\n    var modifiers = dir.modifiers;\n    var tag = el.tag;\n    var type = el.attrsMap.type;\n\n    {\n      // inputs with type=\"file\" are read only and setting the input's\n      // value will throw an error.\n      if (tag === 'input' && type === 'file') {\n        warn$1(\n          \"<\" + (el.tag) + \" v-model=\\\"\" + value + \"\\\" type=\\\"file\\\">:\\n\" +\n          \"File inputs are read only. Use a v-on:change listener instead.\"\n        );\n      }\n    }\n\n    if (el.component) {\n      genComponentModel(el, value, modifiers);\n      // component v-model doesn't need extra runtime\n      return false\n    } else if (tag === 'select') {\n      genSelect(el, value, modifiers);\n    } else if (tag === 'input' && type === 'checkbox') {\n      genCheckboxModel(el, value, modifiers);\n    } else if (tag === 'input' && type === 'radio') {\n      genRadioModel(el, value, modifiers);\n    } else if (tag === 'input' || tag === 'textarea') {\n      genDefaultModel(el, value, modifiers);\n    } else if (!config.isReservedTag(tag)) {\n      genComponentModel(el, value, modifiers);\n      // component v-model doesn't need extra runtime\n      return false\n    } else {\n      warn$1(\n        \"<\" + (el.tag) + \" v-model=\\\"\" + value + \"\\\">: \" +\n        \"v-model is not supported on this element type. \" +\n        'If you are working with contenteditable, it\\'s recommended to ' +\n        'wrap a library dedicated for that purpose inside a custom component.'\n      );\n    }\n\n    // ensure runtime directive metadata\n    return true\n  }\n\n  function genCheckboxModel (\n    el,\n    value,\n    modifiers\n  ) {\n    var number = modifiers && modifiers.number;\n    var valueBinding = getBindingAttr(el, 'value') || 'null';\n    var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';\n    var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';\n    addProp(el, 'checked',\n      \"Array.isArray(\" + value + \")\" +\n      \"?_i(\" + value + \",\" + valueBinding + \")>-1\" + (\n        trueValueBinding === 'true'\n          ? (\":(\" + value + \")\")\n          : (\":_q(\" + value + \",\" + trueValueBinding + \")\")\n      )\n    );\n    addHandler(el, 'change',\n      \"var $$a=\" + value + \",\" +\n          '$$el=$event.target,' +\n          \"$$c=$$el.checked?(\" + trueValueBinding + \"):(\" + falseValueBinding + \");\" +\n      'if(Array.isArray($$a)){' +\n        \"var $$v=\" + (number ? '_n(' + valueBinding + ')' : valueBinding) + \",\" +\n            '$$i=_i($$a,$$v);' +\n        \"if($$el.checked){$$i<0&&(\" + (genAssignmentCode(value, '$$a.concat([$$v])')) + \")}\" +\n        \"else{$$i>-1&&(\" + (genAssignmentCode(value, '$$a.slice(0,$$i).concat($$a.slice($$i+1))')) + \")}\" +\n      \"}else{\" + (genAssignmentCode(value, '$$c')) + \"}\",\n      null, true\n    );\n  }\n\n  function genRadioModel (\n    el,\n    value,\n    modifiers\n  ) {\n    var number = modifiers && modifiers.number;\n    var valueBinding = getBindingAttr(el, 'value') || 'null';\n    valueBinding = number ? (\"_n(\" + valueBinding + \")\") : valueBinding;\n    addProp(el, 'checked', (\"_q(\" + value + \",\" + valueBinding + \")\"));\n    addHandler(el, 'change', genAssignmentCode(value, valueBinding), null, true);\n  }\n\n  function genSelect (\n    el,\n    value,\n    modifiers\n  ) {\n    var number = modifiers && modifiers.number;\n    var selectedVal = \"Array.prototype.filter\" +\n      \".call($event.target.options,function(o){return o.selected})\" +\n      \".map(function(o){var val = \\\"_value\\\" in o ? o._value : o.value;\" +\n      \"return \" + (number ? '_n(val)' : 'val') + \"})\";\n\n    var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';\n    var code = \"var $$selectedVal = \" + selectedVal + \";\";\n    code = code + \" \" + (genAssignmentCode(value, assignment));\n    addHandler(el, 'change', code, null, true);\n  }\n\n  function genDefaultModel (\n    el,\n    value,\n    modifiers\n  ) {\n    var type = el.attrsMap.type;\n\n    // warn if v-bind:value conflicts with v-model\n    // except for inputs with v-bind:type\n    {\n      var value$1 = el.attrsMap['v-bind:value'] || el.attrsMap[':value'];\n      var typeBinding = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];\n      if (value$1 && !typeBinding) {\n        var binding = el.attrsMap['v-bind:value'] ? 'v-bind:value' : ':value';\n        warn$1(\n          binding + \"=\\\"\" + value$1 + \"\\\" conflicts with v-model on the same element \" +\n          'because the latter already expands to a value binding internally'\n        );\n      }\n    }\n\n    var ref = modifiers || {};\n    var lazy = ref.lazy;\n    var number = ref.number;\n    var trim = ref.trim;\n    var needCompositionGuard = !lazy && type !== 'range';\n    var event = lazy\n      ? 'change'\n      : type === 'range'\n        ? RANGE_TOKEN\n        : 'input';\n\n    var valueExpression = '$event.target.value';\n    if (trim) {\n      valueExpression = \"$event.target.value.trim()\";\n    }\n    if (number) {\n      valueExpression = \"_n(\" + valueExpression + \")\";\n    }\n\n    var code = genAssignmentCode(value, valueExpression);\n    if (needCompositionGuard) {\n      code = \"if($event.target.composing)return;\" + code;\n    }\n\n    addProp(el, 'value', (\"(\" + value + \")\"));\n    addHandler(el, event, code, null, true);\n    if (trim || number) {\n      addHandler(el, 'blur', '$forceUpdate()');\n    }\n  }\n\n  /*  */\n\n  // normalize v-model event tokens that can only be determined at runtime.\n  // it's important to place the event as the first in the array because\n  // the whole point is ensuring the v-model callback gets called before\n  // user-attached handlers.\n  function normalizeEvents (on) {\n    /* istanbul ignore if */\n    if (isDef(on[RANGE_TOKEN])) {\n      // IE input[type=range] only supports `change` event\n      var event = isIE ? 'change' : 'input';\n      on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);\n      delete on[RANGE_TOKEN];\n    }\n    // This was originally intended to fix #4521 but no longer necessary\n    // after 2.5. Keeping it for backwards compat with generated code from < 2.4\n    /* istanbul ignore if */\n    if (isDef(on[CHECKBOX_RADIO_TOKEN])) {\n      on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || []);\n      delete on[CHECKBOX_RADIO_TOKEN];\n    }\n  }\n\n  var target$1;\n\n  function createOnceHandler$1 (event, handler, capture) {\n    var _target = target$1; // save current target element in closure\n    return function onceHandler () {\n      var res = handler.apply(null, arguments);\n      if (res !== null) {\n        remove$2(event, onceHandler, capture, _target);\n      }\n    }\n  }\n\n  function add$1 (\n    event,\n    handler,\n    capture,\n    passive\n  ) {\n    handler = withMacroTask(handler);\n    target$1.addEventListener(\n      event,\n      handler,\n      supportsPassive\n        ? { capture: capture, passive: passive }\n        : capture\n    );\n  }\n\n  function remove$2 (\n    event,\n    handler,\n    capture,\n    _target\n  ) {\n    (_target || target$1).removeEventListener(\n      event,\n      handler._withTask || handler,\n      capture\n    );\n  }\n\n  function updateDOMListeners (oldVnode, vnode) {\n    if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {\n      return\n    }\n    var on = vnode.data.on || {};\n    var oldOn = oldVnode.data.on || {};\n    target$1 = vnode.elm;\n    normalizeEvents(on);\n    updateListeners(on, oldOn, add$1, remove$2, createOnceHandler$1, vnode.context);\n    target$1 = undefined;\n  }\n\n  var events = {\n    create: updateDOMListeners,\n    update: updateDOMListeners\n  };\n\n  /*  */\n\n  function updateDOMProps (oldVnode, vnode) {\n    if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {\n      return\n    }\n    var key, cur;\n    var elm = vnode.elm;\n    var oldProps = oldVnode.data.domProps || {};\n    var props = vnode.data.domProps || {};\n    // clone observed objects, as the user probably wants to mutate it\n    if (isDef(props.__ob__)) {\n      props = vnode.data.domProps = extend({}, props);\n    }\n\n    for (key in oldProps) {\n      if (isUndef(props[key])) {\n        elm[key] = '';\n      }\n    }\n    for (key in props) {\n      cur = props[key];\n      // ignore children if the node has textContent or innerHTML,\n      // as these will throw away existing DOM nodes and cause removal errors\n      // on subsequent patches (#3360)\n      if (key === 'textContent' || key === 'innerHTML') {\n        if (vnode.children) { vnode.children.length = 0; }\n        if (cur === oldProps[key]) { continue }\n        // #6601 work around Chrome version <= 55 bug where single textNode\n        // replaced by innerHTML/textContent retains its parentNode property\n        if (elm.childNodes.length === 1) {\n          elm.removeChild(elm.childNodes[0]);\n        }\n      }\n\n      if (key === 'value') {\n        // store value as _value as well since\n        // non-string values will be stringified\n        elm._value = cur;\n        // avoid resetting cursor position when value is the same\n        var strCur = isUndef(cur) ? '' : String(cur);\n        if (shouldUpdateValue(elm, strCur)) {\n          elm.value = strCur;\n        }\n      } else {\n        elm[key] = cur;\n      }\n    }\n  }\n\n  // check platforms/web/util/attrs.js acceptValue\n\n\n  function shouldUpdateValue (elm, checkVal) {\n    return (!elm.composing && (\n      elm.tagName === 'OPTION' ||\n      isNotInFocusAndDirty(elm, checkVal) ||\n      isDirtyWithModifiers(elm, checkVal)\n    ))\n  }\n\n  function isNotInFocusAndDirty (elm, checkVal) {\n    // return true when textbox (.number and .trim) loses focus and its value is\n    // not equal to the updated value\n    var notInFocus = true;\n    // #6157\n    // work around IE bug when accessing document.activeElement in an iframe\n    try { notInFocus = document.activeElement !== elm; } catch (e) {}\n    return notInFocus && elm.value !== checkVal\n  }\n\n  function isDirtyWithModifiers (elm, newVal) {\n    var value = elm.value;\n    var modifiers = elm._vModifiers; // injected by v-model runtime\n    if (isDef(modifiers)) {\n      if (modifiers.lazy) {\n        // inputs with lazy should only be updated when not in focus\n        return false\n      }\n      if (modifiers.number) {\n        return toNumber(value) !== toNumber(newVal)\n      }\n      if (modifiers.trim) {\n        return value.trim() !== newVal.trim()\n      }\n    }\n    return value !== newVal\n  }\n\n  var domProps = {\n    create: updateDOMProps,\n    update: updateDOMProps\n  };\n\n  /*  */\n\n  var parseStyleText = cached(function (cssText) {\n    var res = {};\n    var listDelimiter = /;(?![^(]*\\))/g;\n    var propertyDelimiter = /:(.+)/;\n    cssText.split(listDelimiter).forEach(function (item) {\n      if (item) {\n        var tmp = item.split(propertyDelimiter);\n        tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());\n      }\n    });\n    return res\n  });\n\n  // merge static and dynamic style data on the same vnode\n  function normalizeStyleData (data) {\n    var style = normalizeStyleBinding(data.style);\n    // static style is pre-processed into an object during compilation\n    // and is always a fresh object, so it's safe to merge into it\n    return data.staticStyle\n      ? extend(data.staticStyle, style)\n      : style\n  }\n\n  // normalize possible array / string values into Object\n  function normalizeStyleBinding (bindingStyle) {\n    if (Array.isArray(bindingStyle)) {\n      return toObject(bindingStyle)\n    }\n    if (typeof bindingStyle === 'string') {\n      return parseStyleText(bindingStyle)\n    }\n    return bindingStyle\n  }\n\n  /**\n   * parent component style should be after child's\n   * so that parent component's style could override it\n   */\n  function getStyle (vnode, checkChild) {\n    var res = {};\n    var styleData;\n\n    if (checkChild) {\n      var childNode = vnode;\n      while (childNode.componentInstance) {\n        childNode = childNode.componentInstance._vnode;\n        if (\n          childNode && childNode.data &&\n          (styleData = normalizeStyleData(childNode.data))\n        ) {\n          extend(res, styleData);\n        }\n      }\n    }\n\n    if ((styleData = normalizeStyleData(vnode.data))) {\n      extend(res, styleData);\n    }\n\n    var parentNode = vnode;\n    while ((parentNode = parentNode.parent)) {\n      if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {\n        extend(res, styleData);\n      }\n    }\n    return res\n  }\n\n  /*  */\n\n  var cssVarRE = /^--/;\n  var importantRE = /\\s*!important$/;\n  var setProp = function (el, name, val) {\n    /* istanbul ignore if */\n    if (cssVarRE.test(name)) {\n      el.style.setProperty(name, val);\n    } else if (importantRE.test(val)) {\n      el.style.setProperty(name, val.replace(importantRE, ''), 'important');\n    } else {\n      var normalizedName = normalize(name);\n      if (Array.isArray(val)) {\n        // Support values array created by autoprefixer, e.g.\n        // {display: [\"-webkit-box\", \"-ms-flexbox\", \"flex\"]}\n        // Set them one by one, and the browser will only set those it can recognize\n        for (var i = 0, len = val.length; i < len; i++) {\n          el.style[normalizedName] = val[i];\n        }\n      } else {\n        el.style[normalizedName] = val;\n      }\n    }\n  };\n\n  var vendorNames = ['Webkit', 'Moz', 'ms'];\n\n  var emptyStyle;\n  var normalize = cached(function (prop) {\n    emptyStyle = emptyStyle || document.createElement('div').style;\n    prop = camelize(prop);\n    if (prop !== 'filter' && (prop in emptyStyle)) {\n      return prop\n    }\n    var capName = prop.charAt(0).toUpperCase() + prop.slice(1);\n    for (var i = 0; i < vendorNames.length; i++) {\n      var name = vendorNames[i] + capName;\n      if (name in emptyStyle) {\n        return name\n      }\n    }\n  });\n\n  function updateStyle (oldVnode, vnode) {\n    var data = vnode.data;\n    var oldData = oldVnode.data;\n\n    if (isUndef(data.staticStyle) && isUndef(data.style) &&\n      isUndef(oldData.staticStyle) && isUndef(oldData.style)\n    ) {\n      return\n    }\n\n    var cur, name;\n    var el = vnode.elm;\n    var oldStaticStyle = oldData.staticStyle;\n    var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};\n\n    // if static style exists, stylebinding already merged into it when doing normalizeStyleData\n    var oldStyle = oldStaticStyle || oldStyleBinding;\n\n    var style = normalizeStyleBinding(vnode.data.style) || {};\n\n    // store normalized style under a different key for next diff\n    // make sure to clone it if it's reactive, since the user likely wants\n    // to mutate it.\n    vnode.data.normalizedStyle = isDef(style.__ob__)\n      ? extend({}, style)\n      : style;\n\n    var newStyle = getStyle(vnode, true);\n\n    for (name in oldStyle) {\n      if (isUndef(newStyle[name])) {\n        setProp(el, name, '');\n      }\n    }\n    for (name in newStyle) {\n      cur = newStyle[name];\n      if (cur !== oldStyle[name]) {\n        // ie9 setting to null has no effect, must use empty string\n        setProp(el, name, cur == null ? '' : cur);\n      }\n    }\n  }\n\n  var style = {\n    create: updateStyle,\n    update: updateStyle\n  };\n\n  /*  */\n\n  var whitespaceRE = /\\s+/;\n\n  /**\n   * Add class with compatibility for SVG since classList is not supported on\n   * SVG elements in IE\n   */\n  function addClass (el, cls) {\n    /* istanbul ignore if */\n    if (!cls || !(cls = cls.trim())) {\n      return\n    }\n\n    /* istanbul ignore else */\n    if (el.classList) {\n      if (cls.indexOf(' ') > -1) {\n        cls.split(whitespaceRE).forEach(function (c) { return el.classList.add(c); });\n      } else {\n        el.classList.add(cls);\n      }\n    } else {\n      var cur = \" \" + (el.getAttribute('class') || '') + \" \";\n      if (cur.indexOf(' ' + cls + ' ') < 0) {\n        el.setAttribute('class', (cur + cls).trim());\n      }\n    }\n  }\n\n  /**\n   * Remove class with compatibility for SVG since classList is not supported on\n   * SVG elements in IE\n   */\n  function removeClass (el, cls) {\n    /* istanbul ignore if */\n    if (!cls || !(cls = cls.trim())) {\n      return\n    }\n\n    /* istanbul ignore else */\n    if (el.classList) {\n      if (cls.indexOf(' ') > -1) {\n        cls.split(whitespaceRE).forEach(function (c) { return el.classList.remove(c); });\n      } else {\n        el.classList.remove(cls);\n      }\n      if (!el.classList.length) {\n        el.removeAttribute('class');\n      }\n    } else {\n      var cur = \" \" + (el.getAttribute('class') || '') + \" \";\n      var tar = ' ' + cls + ' ';\n      while (cur.indexOf(tar) >= 0) {\n        cur = cur.replace(tar, ' ');\n      }\n      cur = cur.trim();\n      if (cur) {\n        el.setAttribute('class', cur);\n      } else {\n        el.removeAttribute('class');\n      }\n    }\n  }\n\n  /*  */\n\n  function resolveTransition (def$$1) {\n    if (!def$$1) {\n      return\n    }\n    /* istanbul ignore else */\n    if (typeof def$$1 === 'object') {\n      var res = {};\n      if (def$$1.css !== false) {\n        extend(res, autoCssTransition(def$$1.name || 'v'));\n      }\n      extend(res, def$$1);\n      return res\n    } else if (typeof def$$1 === 'string') {\n      return autoCssTransition(def$$1)\n    }\n  }\n\n  var autoCssTransition = cached(function (name) {\n    return {\n      enterClass: (name + \"-enter\"),\n      enterToClass: (name + \"-enter-to\"),\n      enterActiveClass: (name + \"-enter-active\"),\n      leaveClass: (name + \"-leave\"),\n      leaveToClass: (name + \"-leave-to\"),\n      leaveActiveClass: (name + \"-leave-active\")\n    }\n  });\n\n  var hasTransition = inBrowser && !isIE9;\n  var TRANSITION = 'transition';\n  var ANIMATION = 'animation';\n\n  // Transition property/event sniffing\n  var transitionProp = 'transition';\n  var transitionEndEvent = 'transitionend';\n  var animationProp = 'animation';\n  var animationEndEvent = 'animationend';\n  if (hasTransition) {\n    /* istanbul ignore if */\n    if (window.ontransitionend === undefined &&\n      window.onwebkittransitionend !== undefined\n    ) {\n      transitionProp = 'WebkitTransition';\n      transitionEndEvent = 'webkitTransitionEnd';\n    }\n    if (window.onanimationend === undefined &&\n      window.onwebkitanimationend !== undefined\n    ) {\n      animationProp = 'WebkitAnimation';\n      animationEndEvent = 'webkitAnimationEnd';\n    }\n  }\n\n  // binding to window is necessary to make hot reload work in IE in strict mode\n  var raf = inBrowser\n    ? window.requestAnimationFrame\n      ? window.requestAnimationFrame.bind(window)\n      : setTimeout\n    : /* istanbul ignore next */ function (fn) { return fn(); };\n\n  function nextFrame (fn) {\n    raf(function () {\n      raf(fn);\n    });\n  }\n\n  function addTransitionClass (el, cls) {\n    var transitionClasses = el._transitionClasses || (el._transitionClasses = []);\n    if (transitionClasses.indexOf(cls) < 0) {\n      transitionClasses.push(cls);\n      addClass(el, cls);\n    }\n  }\n\n  function removeTransitionClass (el, cls) {\n    if (el._transitionClasses) {\n      remove(el._transitionClasses, cls);\n    }\n    removeClass(el, cls);\n  }\n\n  function whenTransitionEnds (\n    el,\n    expectedType,\n    cb\n  ) {\n    var ref = getTransitionInfo(el, expectedType);\n    var type = ref.type;\n    var timeout = ref.timeout;\n    var propCount = ref.propCount;\n    if (!type) { return cb() }\n    var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;\n    var ended = 0;\n    var end = function () {\n      el.removeEventListener(event, onEnd);\n      cb();\n    };\n    var onEnd = function (e) {\n      if (e.target === el) {\n        if (++ended >= propCount) {\n          end();\n        }\n      }\n    };\n    setTimeout(function () {\n      if (ended < propCount) {\n        end();\n      }\n    }, timeout + 1);\n    el.addEventListener(event, onEnd);\n  }\n\n  var transformRE = /\\b(transform|all)(,|$)/;\n\n  function getTransitionInfo (el, expectedType) {\n    var styles = window.getComputedStyle(el);\n    // JSDOM may return undefined for transition properties\n    var transitionDelays = (styles[transitionProp + 'Delay'] || '').split(', ');\n    var transitionDurations = (styles[transitionProp + 'Duration'] || '').split(', ');\n    var transitionTimeout = getTimeout(transitionDelays, transitionDurations);\n    var animationDelays = (styles[animationProp + 'Delay'] || '').split(', ');\n    var animationDurations = (styles[animationProp + 'Duration'] || '').split(', ');\n    var animationTimeout = getTimeout(animationDelays, animationDurations);\n\n    var type;\n    var timeout = 0;\n    var propCount = 0;\n    /* istanbul ignore if */\n    if (expectedType === TRANSITION) {\n      if (transitionTimeout > 0) {\n        type = TRANSITION;\n        timeout = transitionTimeout;\n        propCount = transitionDurations.length;\n      }\n    } else if (expectedType === ANIMATION) {\n      if (animationTimeout > 0) {\n        type = ANIMATION;\n        timeout = animationTimeout;\n        propCount = animationDurations.length;\n      }\n    } else {\n      timeout = Math.max(transitionTimeout, animationTimeout);\n      type = timeout > 0\n        ? transitionTimeout > animationTimeout\n          ? TRANSITION\n          : ANIMATION\n        : null;\n      propCount = type\n        ? type === TRANSITION\n          ? transitionDurations.length\n          : animationDurations.length\n        : 0;\n    }\n    var hasTransform =\n      type === TRANSITION &&\n      transformRE.test(styles[transitionProp + 'Property']);\n    return {\n      type: type,\n      timeout: timeout,\n      propCount: propCount,\n      hasTransform: hasTransform\n    }\n  }\n\n  function getTimeout (delays, durations) {\n    /* istanbul ignore next */\n    while (delays.length < durations.length) {\n      delays = delays.concat(delays);\n    }\n\n    return Math.max.apply(null, durations.map(function (d, i) {\n      return toMs(d) + toMs(delays[i])\n    }))\n  }\n\n  // Old versions of Chromium (below 61.0.3163.100) formats floating pointer numbers\n  // in a locale-dependent way, using a comma instead of a dot.\n  // If comma is not replaced with a dot, the input will be rounded down (i.e. acting\n  // as a floor function) causing unexpected behaviors\n  function toMs (s) {\n    return Number(s.slice(0, -1).replace(',', '.')) * 1000\n  }\n\n  /*  */\n\n  function enter (vnode, toggleDisplay) {\n    var el = vnode.elm;\n\n    // call leave callback now\n    if (isDef(el._leaveCb)) {\n      el._leaveCb.cancelled = true;\n      el._leaveCb();\n    }\n\n    var data = resolveTransition(vnode.data.transition);\n    if (isUndef(data)) {\n      return\n    }\n\n    /* istanbul ignore if */\n    if (isDef(el._enterCb) || el.nodeType !== 1) {\n      return\n    }\n\n    var css = data.css;\n    var type = data.type;\n    var enterClass = data.enterClass;\n    var enterToClass = data.enterToClass;\n    var enterActiveClass = data.enterActiveClass;\n    var appearClass = data.appearClass;\n    var appearToClass = data.appearToClass;\n    var appearActiveClass = data.appearActiveClass;\n    var beforeEnter = data.beforeEnter;\n    var enter = data.enter;\n    var afterEnter = data.afterEnter;\n    var enterCancelled = data.enterCancelled;\n    var beforeAppear = data.beforeAppear;\n    var appear = data.appear;\n    var afterAppear = data.afterAppear;\n    var appearCancelled = data.appearCancelled;\n    var duration = data.duration;\n\n    // activeInstance will always be the <transition> component managing this\n    // transition. One edge case to check is when the <transition> is placed\n    // as the root node of a child component. In that case we need to check\n    // <transition>'s parent for appear check.\n    var context = activeInstance;\n    var transitionNode = activeInstance.$vnode;\n    while (transitionNode && transitionNode.parent) {\n      transitionNode = transitionNode.parent;\n      context = transitionNode.context;\n    }\n\n    var isAppear = !context._isMounted || !vnode.isRootInsert;\n\n    if (isAppear && !appear && appear !== '') {\n      return\n    }\n\n    var startClass = isAppear && appearClass\n      ? appearClass\n      : enterClass;\n    var activeClass = isAppear && appearActiveClass\n      ? appearActiveClass\n      : enterActiveClass;\n    var toClass = isAppear && appearToClass\n      ? appearToClass\n      : enterToClass;\n\n    var beforeEnterHook = isAppear\n      ? (beforeAppear || beforeEnter)\n      : beforeEnter;\n    var enterHook = isAppear\n      ? (typeof appear === 'function' ? appear : enter)\n      : enter;\n    var afterEnterHook = isAppear\n      ? (afterAppear || afterEnter)\n      : afterEnter;\n    var enterCancelledHook = isAppear\n      ? (appearCancelled || enterCancelled)\n      : enterCancelled;\n\n    var explicitEnterDuration = toNumber(\n      isObject(duration)\n        ? duration.enter\n        : duration\n    );\n\n    if (explicitEnterDuration != null) {\n      checkDuration(explicitEnterDuration, 'enter', vnode);\n    }\n\n    var expectsCSS = css !== false && !isIE9;\n    var userWantsControl = getHookArgumentsLength(enterHook);\n\n    var cb = el._enterCb = once(function () {\n      if (expectsCSS) {\n        removeTransitionClass(el, toClass);\n        removeTransitionClass(el, activeClass);\n      }\n      if (cb.cancelled) {\n        if (expectsCSS) {\n          removeTransitionClass(el, startClass);\n        }\n        enterCancelledHook && enterCancelledHook(el);\n      } else {\n        afterEnterHook && afterEnterHook(el);\n      }\n      el._enterCb = null;\n    });\n\n    if (!vnode.data.show) {\n      // remove pending leave element on enter by injecting an insert hook\n      mergeVNodeHook(vnode, 'insert', function () {\n        var parent = el.parentNode;\n        var pendingNode = parent && parent._pending && parent._pending[vnode.key];\n        if (pendingNode &&\n          pendingNode.tag === vnode.tag &&\n          pendingNode.elm._leaveCb\n        ) {\n          pendingNode.elm._leaveCb();\n        }\n        enterHook && enterHook(el, cb);\n      });\n    }\n\n    // start enter transition\n    beforeEnterHook && beforeEnterHook(el);\n    if (expectsCSS) {\n      addTransitionClass(el, startClass);\n      addTransitionClass(el, activeClass);\n      nextFrame(function () {\n        removeTransitionClass(el, startClass);\n        if (!cb.cancelled) {\n          addTransitionClass(el, toClass);\n          if (!userWantsControl) {\n            if (isValidDuration(explicitEnterDuration)) {\n              setTimeout(cb, explicitEnterDuration);\n            } else {\n              whenTransitionEnds(el, type, cb);\n            }\n          }\n        }\n      });\n    }\n\n    if (vnode.data.show) {\n      toggleDisplay && toggleDisplay();\n      enterHook && enterHook(el, cb);\n    }\n\n    if (!expectsCSS && !userWantsControl) {\n      cb();\n    }\n  }\n\n  function leave (vnode, rm) {\n    var el = vnode.elm;\n\n    // call enter callback now\n    if (isDef(el._enterCb)) {\n      el._enterCb.cancelled = true;\n      el._enterCb();\n    }\n\n    var data = resolveTransition(vnode.data.transition);\n    if (isUndef(data) || el.nodeType !== 1) {\n      return rm()\n    }\n\n    /* istanbul ignore if */\n    if (isDef(el._leaveCb)) {\n      return\n    }\n\n    var css = data.css;\n    var type = data.type;\n    var leaveClass = data.leaveClass;\n    var leaveToClass = data.leaveToClass;\n    var leaveActiveClass = data.leaveActiveClass;\n    var beforeLeave = data.beforeLeave;\n    var leave = data.leave;\n    var afterLeave = data.afterLeave;\n    var leaveCancelled = data.leaveCancelled;\n    var delayLeave = data.delayLeave;\n    var duration = data.duration;\n\n    var expectsCSS = css !== false && !isIE9;\n    var userWantsControl = getHookArgumentsLength(leave);\n\n    var explicitLeaveDuration = toNumber(\n      isObject(duration)\n        ? duration.leave\n        : duration\n    );\n\n    if (isDef(explicitLeaveDuration)) {\n      checkDuration(explicitLeaveDuration, 'leave', vnode);\n    }\n\n    var cb = el._leaveCb = once(function () {\n      if (el.parentNode && el.parentNode._pending) {\n        el.parentNode._pending[vnode.key] = null;\n      }\n      if (expectsCSS) {\n        removeTransitionClass(el, leaveToClass);\n        removeTransitionClass(el, leaveActiveClass);\n      }\n      if (cb.cancelled) {\n        if (expectsCSS) {\n          removeTransitionClass(el, leaveClass);\n        }\n        leaveCancelled && leaveCancelled(el);\n      } else {\n        rm();\n        afterLeave && afterLeave(el);\n      }\n      el._leaveCb = null;\n    });\n\n    if (delayLeave) {\n      delayLeave(performLeave);\n    } else {\n      performLeave();\n    }\n\n    function performLeave () {\n      // the delayed leave may have already been cancelled\n      if (cb.cancelled) {\n        return\n      }\n      // record leaving element\n      if (!vnode.data.show && el.parentNode) {\n        (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;\n      }\n      beforeLeave && beforeLeave(el);\n      if (expectsCSS) {\n        addTransitionClass(el, leaveClass);\n        addTransitionClass(el, leaveActiveClass);\n        nextFrame(function () {\n          removeTransitionClass(el, leaveClass);\n          if (!cb.cancelled) {\n            addTransitionClass(el, leaveToClass);\n            if (!userWantsControl) {\n              if (isValidDuration(explicitLeaveDuration)) {\n                setTimeout(cb, explicitLeaveDuration);\n              } else {\n                whenTransitionEnds(el, type, cb);\n              }\n            }\n          }\n        });\n      }\n      leave && leave(el, cb);\n      if (!expectsCSS && !userWantsControl) {\n        cb();\n      }\n    }\n  }\n\n  // only used in dev mode\n  function checkDuration (val, name, vnode) {\n    if (typeof val !== 'number') {\n      warn(\n        \"<transition> explicit \" + name + \" duration is not a valid number - \" +\n        \"got \" + (JSON.stringify(val)) + \".\",\n        vnode.context\n      );\n    } else if (isNaN(val)) {\n      warn(\n        \"<transition> explicit \" + name + \" duration is NaN - \" +\n        'the duration expression might be incorrect.',\n        vnode.context\n      );\n    }\n  }\n\n  function isValidDuration (val) {\n    return typeof val === 'number' && !isNaN(val)\n  }\n\n  /**\n   * Normalize a transition hook's argument length. The hook may be:\n   * - a merged hook (invoker) with the original in .fns\n   * - a wrapped component method (check ._length)\n   * - a plain function (.length)\n   */\n  function getHookArgumentsLength (fn) {\n    if (isUndef(fn)) {\n      return false\n    }\n    var invokerFns = fn.fns;\n    if (isDef(invokerFns)) {\n      // invoker\n      return getHookArgumentsLength(\n        Array.isArray(invokerFns)\n          ? invokerFns[0]\n          : invokerFns\n      )\n    } else {\n      return (fn._length || fn.length) > 1\n    }\n  }\n\n  function _enter (_, vnode) {\n    if (vnode.data.show !== true) {\n      enter(vnode);\n    }\n  }\n\n  var transition = inBrowser ? {\n    create: _enter,\n    activate: _enter,\n    remove: function remove$$1 (vnode, rm) {\n      /* istanbul ignore else */\n      if (vnode.data.show !== true) {\n        leave(vnode, rm);\n      } else {\n        rm();\n      }\n    }\n  } : {};\n\n  var platformModules = [\n    attrs,\n    klass,\n    events,\n    domProps,\n    style,\n    transition\n  ];\n\n  /*  */\n\n  // the directive module should be applied last, after all\n  // built-in modules have been applied.\n  var modules = platformModules.concat(baseModules);\n\n  var patch = createPatchFunction({ nodeOps: nodeOps, modules: modules });\n\n  /**\n   * Not type checking this file because flow doesn't like attaching\n   * properties to Elements.\n   */\n\n  /* istanbul ignore if */\n  if (isIE9) {\n    // http://www.matts411.com/post/internet-explorer-9-oninput/\n    document.addEventListener('selectionchange', function () {\n      var el = document.activeElement;\n      if (el && el.vmodel) {\n        trigger(el, 'input');\n      }\n    });\n  }\n\n  var directive = {\n    inserted: function inserted (el, binding, vnode, oldVnode) {\n      if (vnode.tag === 'select') {\n        // #6903\n        if (oldVnode.elm && !oldVnode.elm._vOptions) {\n          mergeVNodeHook(vnode, 'postpatch', function () {\n            directive.componentUpdated(el, binding, vnode);\n          });\n        } else {\n          setSelected(el, binding, vnode.context);\n        }\n        el._vOptions = [].map.call(el.options, getValue);\n      } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {\n        el._vModifiers = binding.modifiers;\n        if (!binding.modifiers.lazy) {\n          el.addEventListener('compositionstart', onCompositionStart);\n          el.addEventListener('compositionend', onCompositionEnd);\n          // Safari < 10.2 & UIWebView doesn't fire compositionend when\n          // switching focus before confirming composition choice\n          // this also fixes the issue where some browsers e.g. iOS Chrome\n          // fires \"change\" instead of \"input\" on autocomplete.\n          el.addEventListener('change', onCompositionEnd);\n          /* istanbul ignore if */\n          if (isIE9) {\n            el.vmodel = true;\n          }\n        }\n      }\n    },\n\n    componentUpdated: function componentUpdated (el, binding, vnode) {\n      if (vnode.tag === 'select') {\n        setSelected(el, binding, vnode.context);\n        // in case the options rendered by v-for have changed,\n        // it's possible that the value is out-of-sync with the rendered options.\n        // detect such cases and filter out values that no longer has a matching\n        // option in the DOM.\n        var prevOptions = el._vOptions;\n        var curOptions = el._vOptions = [].map.call(el.options, getValue);\n        if (curOptions.some(function (o, i) { return !looseEqual(o, prevOptions[i]); })) {\n          // trigger change event if\n          // no matching option found for at least one value\n          var needReset = el.multiple\n            ? binding.value.some(function (v) { return hasNoMatchingOption(v, curOptions); })\n            : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, curOptions);\n          if (needReset) {\n            trigger(el, 'change');\n          }\n        }\n      }\n    }\n  };\n\n  function setSelected (el, binding, vm) {\n    actuallySetSelected(el, binding, vm);\n    /* istanbul ignore if */\n    if (isIE || isEdge) {\n      setTimeout(function () {\n        actuallySetSelected(el, binding, vm);\n      }, 0);\n    }\n  }\n\n  function actuallySetSelected (el, binding, vm) {\n    var value = binding.value;\n    var isMultiple = el.multiple;\n    if (isMultiple && !Array.isArray(value)) {\n      warn(\n        \"<select multiple v-model=\\\"\" + (binding.expression) + \"\\\"> \" +\n        \"expects an Array value for its binding, but got \" + (Object.prototype.toString.call(value).slice(8, -1)),\n        vm\n      );\n      return\n    }\n    var selected, option;\n    for (var i = 0, l = el.options.length; i < l; i++) {\n      option = el.options[i];\n      if (isMultiple) {\n        selected = looseIndexOf(value, getValue(option)) > -1;\n        if (option.selected !== selected) {\n          option.selected = selected;\n        }\n      } else {\n        if (looseEqual(getValue(option), value)) {\n          if (el.selectedIndex !== i) {\n            el.selectedIndex = i;\n          }\n          return\n        }\n      }\n    }\n    if (!isMultiple) {\n      el.selectedIndex = -1;\n    }\n  }\n\n  function hasNoMatchingOption (value, options) {\n    return options.every(function (o) { return !looseEqual(o, value); })\n  }\n\n  function getValue (option) {\n    return '_value' in option\n      ? option._value\n      : option.value\n  }\n\n  function onCompositionStart (e) {\n    e.target.composing = true;\n  }\n\n  function onCompositionEnd (e) {\n    // prevent triggering an input event for no reason\n    if (!e.target.composing) { return }\n    e.target.composing = false;\n    trigger(e.target, 'input');\n  }\n\n  function trigger (el, type) {\n    var e = document.createEvent('HTMLEvents');\n    e.initEvent(type, true, true);\n    el.dispatchEvent(e);\n  }\n\n  /*  */\n\n  // recursively search for possible transition defined inside the component root\n  function locateNode (vnode) {\n    return vnode.componentInstance && (!vnode.data || !vnode.data.transition)\n      ? locateNode(vnode.componentInstance._vnode)\n      : vnode\n  }\n\n  var show = {\n    bind: function bind (el, ref, vnode) {\n      var value = ref.value;\n\n      vnode = locateNode(vnode);\n      var transition$$1 = vnode.data && vnode.data.transition;\n      var originalDisplay = el.__vOriginalDisplay =\n        el.style.display === 'none' ? '' : el.style.display;\n      if (value && transition$$1) {\n        vnode.data.show = true;\n        enter(vnode, function () {\n          el.style.display = originalDisplay;\n        });\n      } else {\n        el.style.display = value ? originalDisplay : 'none';\n      }\n    },\n\n    update: function update (el, ref, vnode) {\n      var value = ref.value;\n      var oldValue = ref.oldValue;\n\n      /* istanbul ignore if */\n      if (!value === !oldValue) { return }\n      vnode = locateNode(vnode);\n      var transition$$1 = vnode.data && vnode.data.transition;\n      if (transition$$1) {\n        vnode.data.show = true;\n        if (value) {\n          enter(vnode, function () {\n            el.style.display = el.__vOriginalDisplay;\n          });\n        } else {\n          leave(vnode, function () {\n            el.style.display = 'none';\n          });\n        }\n      } else {\n        el.style.display = value ? el.__vOriginalDisplay : 'none';\n      }\n    },\n\n    unbind: function unbind (\n      el,\n      binding,\n      vnode,\n      oldVnode,\n      isDestroy\n    ) {\n      if (!isDestroy) {\n        el.style.display = el.__vOriginalDisplay;\n      }\n    }\n  };\n\n  var platformDirectives = {\n    model: directive,\n    show: show\n  };\n\n  /*  */\n\n  var transitionProps = {\n    name: String,\n    appear: Boolean,\n    css: Boolean,\n    mode: String,\n    type: String,\n    enterClass: String,\n    leaveClass: String,\n    enterToClass: String,\n    leaveToClass: String,\n    enterActiveClass: String,\n    leaveActiveClass: String,\n    appearClass: String,\n    appearActiveClass: String,\n    appearToClass: String,\n    duration: [Number, String, Object]\n  };\n\n  // in case the child is also an abstract component, e.g. <keep-alive>\n  // we want to recursively retrieve the real component to be rendered\n  function getRealChild (vnode) {\n    var compOptions = vnode && vnode.componentOptions;\n    if (compOptions && compOptions.Ctor.options.abstract) {\n      return getRealChild(getFirstComponentChild(compOptions.children))\n    } else {\n      return vnode\n    }\n  }\n\n  function extractTransitionData (comp) {\n    var data = {};\n    var options = comp.$options;\n    // props\n    for (var key in options.propsData) {\n      data[key] = comp[key];\n    }\n    // events.\n    // extract listeners and pass them directly to the transition methods\n    var listeners = options._parentListeners;\n    for (var key$1 in listeners) {\n      data[camelize(key$1)] = listeners[key$1];\n    }\n    return data\n  }\n\n  function placeholder (h, rawChild) {\n    if (/\\d-keep-alive$/.test(rawChild.tag)) {\n      return h('keep-alive', {\n        props: rawChild.componentOptions.propsData\n      })\n    }\n  }\n\n  function hasParentTransition (vnode) {\n    while ((vnode = vnode.parent)) {\n      if (vnode.data.transition) {\n        return true\n      }\n    }\n  }\n\n  function isSameChild (child, oldChild) {\n    return oldChild.key === child.key && oldChild.tag === child.tag\n  }\n\n  var isNotTextNode = function (c) { return c.tag || isAsyncPlaceholder(c); };\n\n  var isVShowDirective = function (d) { return d.name === 'show'; };\n\n  var Transition = {\n    name: 'transition',\n    props: transitionProps,\n    abstract: true,\n\n    render: function render (h) {\n      var this$1 = this;\n\n      var children = this.$slots.default;\n      if (!children) {\n        return\n      }\n\n      // filter out text nodes (possible whitespaces)\n      children = children.filter(isNotTextNode);\n      /* istanbul ignore if */\n      if (!children.length) {\n        return\n      }\n\n      // warn multiple elements\n      if (children.length > 1) {\n        warn(\n          '<transition> can only be used on a single element. Use ' +\n          '<transition-group> for lists.',\n          this.$parent\n        );\n      }\n\n      var mode = this.mode;\n\n      // warn invalid mode\n      if (mode && mode !== 'in-out' && mode !== 'out-in'\n      ) {\n        warn(\n          'invalid <transition> mode: ' + mode,\n          this.$parent\n        );\n      }\n\n      var rawChild = children[0];\n\n      // if this is a component root node and the component's\n      // parent container node also has transition, skip.\n      if (hasParentTransition(this.$vnode)) {\n        return rawChild\n      }\n\n      // apply transition data to child\n      // use getRealChild() to ignore abstract components e.g. keep-alive\n      var child = getRealChild(rawChild);\n      /* istanbul ignore if */\n      if (!child) {\n        return rawChild\n      }\n\n      if (this._leaving) {\n        return placeholder(h, rawChild)\n      }\n\n      // ensure a key that is unique to the vnode type and to this transition\n      // component instance. This key will be used to remove pending leaving nodes\n      // during entering.\n      var id = \"__transition-\" + (this._uid) + \"-\";\n      child.key = child.key == null\n        ? child.isComment\n          ? id + 'comment'\n          : id + child.tag\n        : isPrimitive(child.key)\n          ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)\n          : child.key;\n\n      var data = (child.data || (child.data = {})).transition = extractTransitionData(this);\n      var oldRawChild = this._vnode;\n      var oldChild = getRealChild(oldRawChild);\n\n      // mark v-show\n      // so that the transition module can hand over the control to the directive\n      if (child.data.directives && child.data.directives.some(isVShowDirective)) {\n        child.data.show = true;\n      }\n\n      if (\n        oldChild &&\n        oldChild.data &&\n        !isSameChild(child, oldChild) &&\n        !isAsyncPlaceholder(oldChild) &&\n        // #6687 component root is a comment node\n        !(oldChild.componentInstance && oldChild.componentInstance._vnode.isComment)\n      ) {\n        // replace old child transition data with fresh one\n        // important for dynamic transitions!\n        var oldData = oldChild.data.transition = extend({}, data);\n        // handle transition mode\n        if (mode === 'out-in') {\n          // return placeholder node and queue update when leave finishes\n          this._leaving = true;\n          mergeVNodeHook(oldData, 'afterLeave', function () {\n            this$1._leaving = false;\n            this$1.$forceUpdate();\n          });\n          return placeholder(h, rawChild)\n        } else if (mode === 'in-out') {\n          if (isAsyncPlaceholder(child)) {\n            return oldRawChild\n          }\n          var delayedLeave;\n          var performLeave = function () { delayedLeave(); };\n          mergeVNodeHook(data, 'afterEnter', performLeave);\n          mergeVNodeHook(data, 'enterCancelled', performLeave);\n          mergeVNodeHook(oldData, 'delayLeave', function (leave) { delayedLeave = leave; });\n        }\n      }\n\n      return rawChild\n    }\n  };\n\n  /*  */\n\n  var props = extend({\n    tag: String,\n    moveClass: String\n  }, transitionProps);\n\n  delete props.mode;\n\n  var TransitionGroup = {\n    props: props,\n\n    beforeMount: function beforeMount () {\n      var this$1 = this;\n\n      var update = this._update;\n      this._update = function (vnode, hydrating) {\n        var restoreActiveInstance = setActiveInstance(this$1);\n        // force removing pass\n        this$1.__patch__(\n          this$1._vnode,\n          this$1.kept,\n          false, // hydrating\n          true // removeOnly (!important, avoids unnecessary moves)\n        );\n        this$1._vnode = this$1.kept;\n        restoreActiveInstance();\n        update.call(this$1, vnode, hydrating);\n      };\n    },\n\n    render: function render (h) {\n      var tag = this.tag || this.$vnode.data.tag || 'span';\n      var map = Object.create(null);\n      var prevChildren = this.prevChildren = this.children;\n      var rawChildren = this.$slots.default || [];\n      var children = this.children = [];\n      var transitionData = extractTransitionData(this);\n\n      for (var i = 0; i < rawChildren.length; i++) {\n        var c = rawChildren[i];\n        if (c.tag) {\n          if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {\n            children.push(c);\n            map[c.key] = c\n            ;(c.data || (c.data = {})).transition = transitionData;\n          } else {\n            var opts = c.componentOptions;\n            var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;\n            warn((\"<transition-group> children must be keyed: <\" + name + \">\"));\n          }\n        }\n      }\n\n      if (prevChildren) {\n        var kept = [];\n        var removed = [];\n        for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {\n          var c$1 = prevChildren[i$1];\n          c$1.data.transition = transitionData;\n          c$1.data.pos = c$1.elm.getBoundingClientRect();\n          if (map[c$1.key]) {\n            kept.push(c$1);\n          } else {\n            removed.push(c$1);\n          }\n        }\n        this.kept = h(tag, null, kept);\n        this.removed = removed;\n      }\n\n      return h(tag, null, children)\n    },\n\n    updated: function updated () {\n      var children = this.prevChildren;\n      var moveClass = this.moveClass || ((this.name || 'v') + '-move');\n      if (!children.length || !this.hasMove(children[0].elm, moveClass)) {\n        return\n      }\n\n      // we divide the work into three loops to avoid mixing DOM reads and writes\n      // in each iteration - which helps prevent layout thrashing.\n      children.forEach(callPendingCbs);\n      children.forEach(recordPosition);\n      children.forEach(applyTranslation);\n\n      // force reflow to put everything in position\n      // assign to this to avoid being removed in tree-shaking\n      // $flow-disable-line\n      this._reflow = document.body.offsetHeight;\n\n      children.forEach(function (c) {\n        if (c.data.moved) {\n          var el = c.elm;\n          var s = el.style;\n          addTransitionClass(el, moveClass);\n          s.transform = s.WebkitTransform = s.transitionDuration = '';\n          el.addEventListener(transitionEndEvent, el._moveCb = function cb (e) {\n            if (e && e.target !== el) {\n              return\n            }\n            if (!e || /transform$/.test(e.propertyName)) {\n              el.removeEventListener(transitionEndEvent, cb);\n              el._moveCb = null;\n              removeTransitionClass(el, moveClass);\n            }\n          });\n        }\n      });\n    },\n\n    methods: {\n      hasMove: function hasMove (el, moveClass) {\n        /* istanbul ignore if */\n        if (!hasTransition) {\n          return false\n        }\n        /* istanbul ignore if */\n        if (this._hasMove) {\n          return this._hasMove\n        }\n        // Detect whether an element with the move class applied has\n        // CSS transitions. Since the element may be inside an entering\n        // transition at this very moment, we make a clone of it and remove\n        // all other transition classes applied to ensure only the move class\n        // is applied.\n        var clone = el.cloneNode();\n        if (el._transitionClasses) {\n          el._transitionClasses.forEach(function (cls) { removeClass(clone, cls); });\n        }\n        addClass(clone, moveClass);\n        clone.style.display = 'none';\n        this.$el.appendChild(clone);\n        var info = getTransitionInfo(clone);\n        this.$el.removeChild(clone);\n        return (this._hasMove = info.hasTransform)\n      }\n    }\n  };\n\n  function callPendingCbs (c) {\n    /* istanbul ignore if */\n    if (c.elm._moveCb) {\n      c.elm._moveCb();\n    }\n    /* istanbul ignore if */\n    if (c.elm._enterCb) {\n      c.elm._enterCb();\n    }\n  }\n\n  function recordPosition (c) {\n    c.data.newPos = c.elm.getBoundingClientRect();\n  }\n\n  function applyTranslation (c) {\n    var oldPos = c.data.pos;\n    var newPos = c.data.newPos;\n    var dx = oldPos.left - newPos.left;\n    var dy = oldPos.top - newPos.top;\n    if (dx || dy) {\n      c.data.moved = true;\n      var s = c.elm.style;\n      s.transform = s.WebkitTransform = \"translate(\" + dx + \"px,\" + dy + \"px)\";\n      s.transitionDuration = '0s';\n    }\n  }\n\n  var platformComponents = {\n    Transition: Transition,\n    TransitionGroup: TransitionGroup\n  };\n\n  /*  */\n\n  // install platform specific utils\n  Vue.config.mustUseProp = mustUseProp;\n  Vue.config.isReservedTag = isReservedTag;\n  Vue.config.isReservedAttr = isReservedAttr;\n  Vue.config.getTagNamespace = getTagNamespace;\n  Vue.config.isUnknownElement = isUnknownElement;\n\n  // install platform runtime directives & components\n  extend(Vue.options.directives, platformDirectives);\n  extend(Vue.options.components, platformComponents);\n\n  // install platform patch function\n  Vue.prototype.__patch__ = inBrowser ? patch : noop;\n\n  // public mount method\n  Vue.prototype.$mount = function (\n    el,\n    hydrating\n  ) {\n    el = el && inBrowser ? query(el) : undefined;\n    return mountComponent(this, el, hydrating)\n  };\n\n  // devtools global hook\n  /* istanbul ignore next */\n  if (inBrowser) {\n    setTimeout(function () {\n      if (config.devtools) {\n        if (devtools) {\n          devtools.emit('init', Vue);\n        } else if (\n          isChrome\n        ) {\n          console[console.info ? 'info' : 'log'](\n            'Download the Vue Devtools extension for a better development experience:\\n' +\n            'https://github.com/vuejs/vue-devtools'\n          );\n        }\n      }\n      if (config.productionTip !== false &&\n        typeof console !== 'undefined'\n      ) {\n        console[console.info ? 'info' : 'log'](\n          \"You are running Vue in development mode.\\n\" +\n          \"Make sure to turn on production mode when deploying for production.\\n\" +\n          \"See more tips at https://vuejs.org/guide/deployment.html\"\n        );\n      }\n    }, 0);\n  }\n\n  /*  */\n\n  var defaultTagRE = /\\{\\{((?:.|\\r?\\n)+?)\\}\\}/g;\n  var regexEscapeRE = /[-.*+?^${}()|[\\]\\/\\\\]/g;\n\n  var buildRegex = cached(function (delimiters) {\n    var open = delimiters[0].replace(regexEscapeRE, '\\\\$&');\n    var close = delimiters[1].replace(regexEscapeRE, '\\\\$&');\n    return new RegExp(open + '((?:.|\\\\n)+?)' + close, 'g')\n  });\n\n\n\n  function parseText (\n    text,\n    delimiters\n  ) {\n    var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;\n    if (!tagRE.test(text)) {\n      return\n    }\n    var tokens = [];\n    var rawTokens = [];\n    var lastIndex = tagRE.lastIndex = 0;\n    var match, index, tokenValue;\n    while ((match = tagRE.exec(text))) {\n      index = match.index;\n      // push text token\n      if (index > lastIndex) {\n        rawTokens.push(tokenValue = text.slice(lastIndex, index));\n        tokens.push(JSON.stringify(tokenValue));\n      }\n      // tag token\n      var exp = parseFilters(match[1].trim());\n      tokens.push((\"_s(\" + exp + \")\"));\n      rawTokens.push({ '@binding': exp });\n      lastIndex = index + match[0].length;\n    }\n    if (lastIndex < text.length) {\n      rawTokens.push(tokenValue = text.slice(lastIndex));\n      tokens.push(JSON.stringify(tokenValue));\n    }\n    return {\n      expression: tokens.join('+'),\n      tokens: rawTokens\n    }\n  }\n\n  /*  */\n\n  function transformNode (el, options) {\n    var warn = options.warn || baseWarn;\n    var staticClass = getAndRemoveAttr(el, 'class');\n    if (staticClass) {\n      var res = parseText(staticClass, options.delimiters);\n      if (res) {\n        warn(\n          \"class=\\\"\" + staticClass + \"\\\": \" +\n          'Interpolation inside attributes has been removed. ' +\n          'Use v-bind or the colon shorthand instead. For example, ' +\n          'instead of <div class=\"{{ val }}\">, use <div :class=\"val\">.'\n        );\n      }\n    }\n    if (staticClass) {\n      el.staticClass = JSON.stringify(staticClass);\n    }\n    var classBinding = getBindingAttr(el, 'class', false /* getStatic */);\n    if (classBinding) {\n      el.classBinding = classBinding;\n    }\n  }\n\n  function genData (el) {\n    var data = '';\n    if (el.staticClass) {\n      data += \"staticClass:\" + (el.staticClass) + \",\";\n    }\n    if (el.classBinding) {\n      data += \"class:\" + (el.classBinding) + \",\";\n    }\n    return data\n  }\n\n  var klass$1 = {\n    staticKeys: ['staticClass'],\n    transformNode: transformNode,\n    genData: genData\n  };\n\n  /*  */\n\n  function transformNode$1 (el, options) {\n    var warn = options.warn || baseWarn;\n    var staticStyle = getAndRemoveAttr(el, 'style');\n    if (staticStyle) {\n      /* istanbul ignore if */\n      {\n        var res = parseText(staticStyle, options.delimiters);\n        if (res) {\n          warn(\n            \"style=\\\"\" + staticStyle + \"\\\": \" +\n            'Interpolation inside attributes has been removed. ' +\n            'Use v-bind or the colon shorthand instead. For example, ' +\n            'instead of <div style=\"{{ val }}\">, use <div :style=\"val\">.'\n          );\n        }\n      }\n      el.staticStyle = JSON.stringify(parseStyleText(staticStyle));\n    }\n\n    var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);\n    if (styleBinding) {\n      el.styleBinding = styleBinding;\n    }\n  }\n\n  function genData$1 (el) {\n    var data = '';\n    if (el.staticStyle) {\n      data += \"staticStyle:\" + (el.staticStyle) + \",\";\n    }\n    if (el.styleBinding) {\n      data += \"style:(\" + (el.styleBinding) + \"),\";\n    }\n    return data\n  }\n\n  var style$1 = {\n    staticKeys: ['staticStyle'],\n    transformNode: transformNode$1,\n    genData: genData$1\n  };\n\n  /*  */\n\n  var decoder;\n\n  var he = {\n    decode: function decode (html) {\n      decoder = decoder || document.createElement('div');\n      decoder.innerHTML = html;\n      return decoder.textContent\n    }\n  };\n\n  /*  */\n\n  var isUnaryTag = makeMap(\n    'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +\n    'link,meta,param,source,track,wbr'\n  );\n\n  // Elements that you can, intentionally, leave open\n  // (and which close themselves)\n  var canBeLeftOpenTag = makeMap(\n    'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'\n  );\n\n  // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3\n  // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content\n  var isNonPhrasingTag = makeMap(\n    'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +\n    'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +\n    'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +\n    'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +\n    'title,tr,track'\n  );\n\n  /**\n   * Not type-checking this file because it's mostly vendor code.\n   */\n\n  // Regular Expressions for parsing tags and attributes\n  var attribute = /^\\s*([^\\s\"'<>\\/=]+)(?:\\s*(=)\\s*(?:\"([^\"]*)\"+|'([^']*)'+|([^\\s\"'=<>`]+)))?/;\n  // could use https://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName\n  // but for Vue templates we can enforce a simple charset\n  var ncname = '[a-zA-Z_][\\\\w\\\\-\\\\.]*';\n  var qnameCapture = \"((?:\" + ncname + \"\\\\:)?\" + ncname + \")\";\n  var startTagOpen = new RegExp((\"^<\" + qnameCapture));\n  var startTagClose = /^\\s*(\\/?)>/;\n  var endTag = new RegExp((\"^<\\\\/\" + qnameCapture + \"[^>]*>\"));\n  var doctype = /^<!DOCTYPE [^>]+>/i;\n  // #7298: escape - to avoid being pased as HTML comment when inlined in page\n  var comment = /^<!\\--/;\n  var conditionalComment = /^<!\\[/;\n\n  // Special Elements (can contain anything)\n  var isPlainTextElement = makeMap('script,style,textarea', true);\n  var reCache = {};\n\n  var decodingMap = {\n    '&lt;': '<',\n    '&gt;': '>',\n    '&quot;': '\"',\n    '&amp;': '&',\n    '&#10;': '\\n',\n    '&#9;': '\\t'\n  };\n  var encodedAttr = /&(?:lt|gt|quot|amp);/g;\n  var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#10|#9);/g;\n\n  // #5992\n  var isIgnoreNewlineTag = makeMap('pre,textarea', true);\n  var shouldIgnoreFirstNewline = function (tag, html) { return tag && isIgnoreNewlineTag(tag) && html[0] === '\\n'; };\n\n  function decodeAttr (value, shouldDecodeNewlines) {\n    var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;\n    return value.replace(re, function (match) { return decodingMap[match]; })\n  }\n\n  function parseHTML (html, options) {\n    var stack = [];\n    var expectHTML = options.expectHTML;\n    var isUnaryTag$$1 = options.isUnaryTag || no;\n    var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;\n    var index = 0;\n    var last, lastTag;\n    while (html) {\n      last = html;\n      // Make sure we're not in a plaintext content element like script/style\n      if (!lastTag || !isPlainTextElement(lastTag)) {\n        var textEnd = html.indexOf('<');\n        if (textEnd === 0) {\n          // Comment:\n          if (comment.test(html)) {\n            var commentEnd = html.indexOf('-->');\n\n            if (commentEnd >= 0) {\n              if (options.shouldKeepComment) {\n                options.comment(html.substring(4, commentEnd));\n              }\n              advance(commentEnd + 3);\n              continue\n            }\n          }\n\n          // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment\n          if (conditionalComment.test(html)) {\n            var conditionalEnd = html.indexOf(']>');\n\n            if (conditionalEnd >= 0) {\n              advance(conditionalEnd + 2);\n              continue\n            }\n          }\n\n          // Doctype:\n          var doctypeMatch = html.match(doctype);\n          if (doctypeMatch) {\n            advance(doctypeMatch[0].length);\n            continue\n          }\n\n          // End tag:\n          var endTagMatch = html.match(endTag);\n          if (endTagMatch) {\n            var curIndex = index;\n            advance(endTagMatch[0].length);\n            parseEndTag(endTagMatch[1], curIndex, index);\n            continue\n          }\n\n          // Start tag:\n          var startTagMatch = parseStartTag();\n          if (startTagMatch) {\n            handleStartTag(startTagMatch);\n            if (shouldIgnoreFirstNewline(startTagMatch.tagName, html)) {\n              advance(1);\n            }\n            continue\n          }\n        }\n\n        var text = (void 0), rest = (void 0), next = (void 0);\n        if (textEnd >= 0) {\n          rest = html.slice(textEnd);\n          while (\n            !endTag.test(rest) &&\n            !startTagOpen.test(rest) &&\n            !comment.test(rest) &&\n            !conditionalComment.test(rest)\n          ) {\n            // < in plain text, be forgiving and treat it as text\n            next = rest.indexOf('<', 1);\n            if (next < 0) { break }\n            textEnd += next;\n            rest = html.slice(textEnd);\n          }\n          text = html.substring(0, textEnd);\n          advance(textEnd);\n        }\n\n        if (textEnd < 0) {\n          text = html;\n          html = '';\n        }\n\n        if (options.chars && text) {\n          options.chars(text);\n        }\n      } else {\n        var endTagLength = 0;\n        var stackedTag = lastTag.toLowerCase();\n        var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\\\s\\\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));\n        var rest$1 = html.replace(reStackedTag, function (all, text, endTag) {\n          endTagLength = endTag.length;\n          if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {\n            text = text\n              .replace(/<!\\--([\\s\\S]*?)-->/g, '$1') // #7298\n              .replace(/<!\\[CDATA\\[([\\s\\S]*?)]]>/g, '$1');\n          }\n          if (shouldIgnoreFirstNewline(stackedTag, text)) {\n            text = text.slice(1);\n          }\n          if (options.chars) {\n            options.chars(text);\n          }\n          return ''\n        });\n        index += html.length - rest$1.length;\n        html = rest$1;\n        parseEndTag(stackedTag, index - endTagLength, index);\n      }\n\n      if (html === last) {\n        options.chars && options.chars(html);\n        if (!stack.length && options.warn) {\n          options.warn((\"Mal-formatted tag at end of template: \\\"\" + html + \"\\\"\"));\n        }\n        break\n      }\n    }\n\n    // Clean up any remaining tags\n    parseEndTag();\n\n    function advance (n) {\n      index += n;\n      html = html.substring(n);\n    }\n\n    function parseStartTag () {\n      var start = html.match(startTagOpen);\n      if (start) {\n        var match = {\n          tagName: start[1],\n          attrs: [],\n          start: index\n        };\n        advance(start[0].length);\n        var end, attr;\n        while (!(end = html.match(startTagClose)) && (attr = html.match(attribute))) {\n          advance(attr[0].length);\n          match.attrs.push(attr);\n        }\n        if (end) {\n          match.unarySlash = end[1];\n          advance(end[0].length);\n          match.end = index;\n          return match\n        }\n      }\n    }\n\n    function handleStartTag (match) {\n      var tagName = match.tagName;\n      var unarySlash = match.unarySlash;\n\n      if (expectHTML) {\n        if (lastTag === 'p' && isNonPhrasingTag(tagName)) {\n          parseEndTag(lastTag);\n        }\n        if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {\n          parseEndTag(tagName);\n        }\n      }\n\n      var unary = isUnaryTag$$1(tagName) || !!unarySlash;\n\n      var l = match.attrs.length;\n      var attrs = new Array(l);\n      for (var i = 0; i < l; i++) {\n        var args = match.attrs[i];\n        var value = args[3] || args[4] || args[5] || '';\n        var shouldDecodeNewlines = tagName === 'a' && args[1] === 'href'\n          ? options.shouldDecodeNewlinesForHref\n          : options.shouldDecodeNewlines;\n        attrs[i] = {\n          name: args[1],\n          value: decodeAttr(value, shouldDecodeNewlines)\n        };\n      }\n\n      if (!unary) {\n        stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs });\n        lastTag = tagName;\n      }\n\n      if (options.start) {\n        options.start(tagName, attrs, unary, match.start, match.end);\n      }\n    }\n\n    function parseEndTag (tagName, start, end) {\n      var pos, lowerCasedTagName;\n      if (start == null) { start = index; }\n      if (end == null) { end = index; }\n\n      // Find the closest opened tag of the same type\n      if (tagName) {\n        lowerCasedTagName = tagName.toLowerCase();\n        for (pos = stack.length - 1; pos >= 0; pos--) {\n          if (stack[pos].lowerCasedTag === lowerCasedTagName) {\n            break\n          }\n        }\n      } else {\n        // If no tag name is provided, clean shop\n        pos = 0;\n      }\n\n      if (pos >= 0) {\n        // Close all the open elements, up the stack\n        for (var i = stack.length - 1; i >= pos; i--) {\n          if (i > pos || !tagName &&\n            options.warn\n          ) {\n            options.warn(\n              (\"tag <\" + (stack[i].tag) + \"> has no matching end tag.\")\n            );\n          }\n          if (options.end) {\n            options.end(stack[i].tag, start, end);\n          }\n        }\n\n        // Remove the open elements from the stack\n        stack.length = pos;\n        lastTag = pos && stack[pos - 1].tag;\n      } else if (lowerCasedTagName === 'br') {\n        if (options.start) {\n          options.start(tagName, [], true, start, end);\n        }\n      } else if (lowerCasedTagName === 'p') {\n        if (options.start) {\n          options.start(tagName, [], false, start, end);\n        }\n        if (options.end) {\n          options.end(tagName, start, end);\n        }\n      }\n    }\n  }\n\n  /*  */\n\n  var onRE = /^@|^v-on:/;\n  var dirRE = /^v-|^@|^:/;\n  var forAliasRE = /([\\s\\S]*?)\\s+(?:in|of)\\s+([\\s\\S]*)/;\n  var forIteratorRE = /,([^,\\}\\]]*)(?:,([^,\\}\\]]*))?$/;\n  var stripParensRE = /^\\(|\\)$/g;\n\n  var argRE = /:(.*)$/;\n  var bindRE = /^:|^v-bind:/;\n  var modifierRE = /\\.[^.]+/g;\n\n  var decodeHTMLCached = cached(he.decode);\n\n  // configurable state\n  var warn$2;\n  var delimiters;\n  var transforms;\n  var preTransforms;\n  var postTransforms;\n  var platformIsPreTag;\n  var platformMustUseProp;\n  var platformGetTagNamespace;\n\n\n\n  function createASTElement (\n    tag,\n    attrs,\n    parent\n  ) {\n    return {\n      type: 1,\n      tag: tag,\n      attrsList: attrs,\n      attrsMap: makeAttrsMap(attrs),\n      parent: parent,\n      children: []\n    }\n  }\n\n  /**\n   * Convert HTML string to AST.\n   */\n  function parse (\n    template,\n    options\n  ) {\n    warn$2 = options.warn || baseWarn;\n\n    platformIsPreTag = options.isPreTag || no;\n    platformMustUseProp = options.mustUseProp || no;\n    platformGetTagNamespace = options.getTagNamespace || no;\n\n    transforms = pluckModuleFunction(options.modules, 'transformNode');\n    preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');\n    postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');\n\n    delimiters = options.delimiters;\n\n    var stack = [];\n    var preserveWhitespace = options.preserveWhitespace !== false;\n    var root;\n    var currentParent;\n    var inVPre = false;\n    var inPre = false;\n    var warned = false;\n\n    function warnOnce (msg) {\n      if (!warned) {\n        warned = true;\n        warn$2(msg);\n      }\n    }\n\n    function closeElement (element) {\n      // check pre state\n      if (element.pre) {\n        inVPre = false;\n      }\n      if (platformIsPreTag(element.tag)) {\n        inPre = false;\n      }\n      // apply post-transforms\n      for (var i = 0; i < postTransforms.length; i++) {\n        postTransforms[i](element, options);\n      }\n    }\n\n    parseHTML(template, {\n      warn: warn$2,\n      expectHTML: options.expectHTML,\n      isUnaryTag: options.isUnaryTag,\n      canBeLeftOpenTag: options.canBeLeftOpenTag,\n      shouldDecodeNewlines: options.shouldDecodeNewlines,\n      shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,\n      shouldKeepComment: options.comments,\n      start: function start (tag, attrs, unary) {\n        // check namespace.\n        // inherit parent ns if there is one\n        var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);\n\n        // handle IE svg bug\n        /* istanbul ignore if */\n        if (isIE && ns === 'svg') {\n          attrs = guardIESVGBug(attrs);\n        }\n\n        var element = createASTElement(tag, attrs, currentParent);\n        if (ns) {\n          element.ns = ns;\n        }\n\n        if (isForbiddenTag(element) && !isServerRendering()) {\n          element.forbidden = true;\n          warn$2(\n            'Templates should only be responsible for mapping the state to the ' +\n            'UI. Avoid placing tags with side-effects in your templates, such as ' +\n            \"<\" + tag + \">\" + ', as they will not be parsed.'\n          );\n        }\n\n        // apply pre-transforms\n        for (var i = 0; i < preTransforms.length; i++) {\n          element = preTransforms[i](element, options) || element;\n        }\n\n        if (!inVPre) {\n          processPre(element);\n          if (element.pre) {\n            inVPre = true;\n          }\n        }\n        if (platformIsPreTag(element.tag)) {\n          inPre = true;\n        }\n        if (inVPre) {\n          processRawAttrs(element);\n        } else if (!element.processed) {\n          // structural directives\n          processFor(element);\n          processIf(element);\n          processOnce(element);\n          // element-scope stuff\n          processElement(element, options);\n        }\n\n        function checkRootConstraints (el) {\n          {\n            if (el.tag === 'slot' || el.tag === 'template') {\n              warnOnce(\n                \"Cannot use <\" + (el.tag) + \"> as component root element because it may \" +\n                'contain multiple nodes.'\n              );\n            }\n            if (el.attrsMap.hasOwnProperty('v-for')) {\n              warnOnce(\n                'Cannot use v-for on stateful component root element because ' +\n                'it renders multiple elements.'\n              );\n            }\n          }\n        }\n\n        // tree management\n        if (!root) {\n          root = element;\n          checkRootConstraints(root);\n        } else if (!stack.length) {\n          // allow root elements with v-if, v-else-if and v-else\n          if (root.if && (element.elseif || element.else)) {\n            checkRootConstraints(element);\n            addIfCondition(root, {\n              exp: element.elseif,\n              block: element\n            });\n          } else {\n            warnOnce(\n              \"Component template should contain exactly one root element. \" +\n              \"If you are using v-if on multiple elements, \" +\n              \"use v-else-if to chain them instead.\"\n            );\n          }\n        }\n        if (currentParent && !element.forbidden) {\n          if (element.elseif || element.else) {\n            processIfConditions(element, currentParent);\n          } else if (element.slotScope) { // scoped slot\n            currentParent.plain = false;\n            var name = element.slotTarget || '\"default\"'\n            ;(currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;\n          } else {\n            currentParent.children.push(element);\n            element.parent = currentParent;\n          }\n        }\n        if (!unary) {\n          currentParent = element;\n          stack.push(element);\n        } else {\n          closeElement(element);\n        }\n      },\n\n      end: function end () {\n        // remove trailing whitespace\n        var element = stack[stack.length - 1];\n        var lastNode = element.children[element.children.length - 1];\n        if (lastNode && lastNode.type === 3 && lastNode.text === ' ' && !inPre) {\n          element.children.pop();\n        }\n        // pop stack\n        stack.length -= 1;\n        currentParent = stack[stack.length - 1];\n        closeElement(element);\n      },\n\n      chars: function chars (text) {\n        if (!currentParent) {\n          {\n            if (text === template) {\n              warnOnce(\n                'Component template requires a root element, rather than just text.'\n              );\n            } else if ((text = text.trim())) {\n              warnOnce(\n                (\"text \\\"\" + text + \"\\\" outside root element will be ignored.\")\n              );\n            }\n          }\n          return\n        }\n        // IE textarea placeholder bug\n        /* istanbul ignore if */\n        if (isIE &&\n          currentParent.tag === 'textarea' &&\n          currentParent.attrsMap.placeholder === text\n        ) {\n          return\n        }\n        var children = currentParent.children;\n        text = inPre || text.trim()\n          ? isTextTag(currentParent) ? text : decodeHTMLCached(text)\n          // only preserve whitespace if its not right after a starting tag\n          : preserveWhitespace && children.length ? ' ' : '';\n        if (text) {\n          var res;\n          if (!inVPre && text !== ' ' && (res = parseText(text, delimiters))) {\n            children.push({\n              type: 2,\n              expression: res.expression,\n              tokens: res.tokens,\n              text: text\n            });\n          } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {\n            children.push({\n              type: 3,\n              text: text\n            });\n          }\n        }\n      },\n      comment: function comment (text) {\n        currentParent.children.push({\n          type: 3,\n          text: text,\n          isComment: true\n        });\n      }\n    });\n    return root\n  }\n\n  function processPre (el) {\n    if (getAndRemoveAttr(el, 'v-pre') != null) {\n      el.pre = true;\n    }\n  }\n\n  function processRawAttrs (el) {\n    var l = el.attrsList.length;\n    if (l) {\n      var attrs = el.attrs = new Array(l);\n      for (var i = 0; i < l; i++) {\n        attrs[i] = {\n          name: el.attrsList[i].name,\n          value: JSON.stringify(el.attrsList[i].value)\n        };\n      }\n    } else if (!el.pre) {\n      // non root node in pre blocks with no attributes\n      el.plain = true;\n    }\n  }\n\n  function processElement (element, options) {\n    processKey(element);\n\n    // determine whether this is a plain element after\n    // removing structural attributes\n    element.plain = !element.key && !element.attrsList.length;\n\n    processRef(element);\n    processSlot(element);\n    processComponent(element);\n    for (var i = 0; i < transforms.length; i++) {\n      element = transforms[i](element, options) || element;\n    }\n    processAttrs(element);\n  }\n\n  function processKey (el) {\n    var exp = getBindingAttr(el, 'key');\n    if (exp) {\n      {\n        if (el.tag === 'template') {\n          warn$2(\"<template> cannot be keyed. Place the key on real elements instead.\");\n        }\n        if (el.for) {\n          var iterator = el.iterator2 || el.iterator1;\n          var parent = el.parent;\n          if (iterator && iterator === exp && parent && parent.tag === 'transition-group') {\n            warn$2(\n              \"Do not use v-for index as key on <transition-group> children, \" +\n              \"this is the same as not using keys.\"\n            );\n          }\n        }\n      }\n      el.key = exp;\n    }\n  }\n\n  function processRef (el) {\n    var ref = getBindingAttr(el, 'ref');\n    if (ref) {\n      el.ref = ref;\n      el.refInFor = checkInFor(el);\n    }\n  }\n\n  function processFor (el) {\n    var exp;\n    if ((exp = getAndRemoveAttr(el, 'v-for'))) {\n      var res = parseFor(exp);\n      if (res) {\n        extend(el, res);\n      } else {\n        warn$2(\n          (\"Invalid v-for expression: \" + exp)\n        );\n      }\n    }\n  }\n\n\n\n  function parseFor (exp) {\n    var inMatch = exp.match(forAliasRE);\n    if (!inMatch) { return }\n    var res = {};\n    res.for = inMatch[2].trim();\n    var alias = inMatch[1].trim().replace(stripParensRE, '');\n    var iteratorMatch = alias.match(forIteratorRE);\n    if (iteratorMatch) {\n      res.alias = alias.replace(forIteratorRE, '').trim();\n      res.iterator1 = iteratorMatch[1].trim();\n      if (iteratorMatch[2]) {\n        res.iterator2 = iteratorMatch[2].trim();\n      }\n    } else {\n      res.alias = alias;\n    }\n    return res\n  }\n\n  function processIf (el) {\n    var exp = getAndRemoveAttr(el, 'v-if');\n    if (exp) {\n      el.if = exp;\n      addIfCondition(el, {\n        exp: exp,\n        block: el\n      });\n    } else {\n      if (getAndRemoveAttr(el, 'v-else') != null) {\n        el.else = true;\n      }\n      var elseif = getAndRemoveAttr(el, 'v-else-if');\n      if (elseif) {\n        el.elseif = elseif;\n      }\n    }\n  }\n\n  function processIfConditions (el, parent) {\n    var prev = findPrevElement(parent.children);\n    if (prev && prev.if) {\n      addIfCondition(prev, {\n        exp: el.elseif,\n        block: el\n      });\n    } else {\n      warn$2(\n        \"v-\" + (el.elseif ? ('else-if=\"' + el.elseif + '\"') : 'else') + \" \" +\n        \"used on element <\" + (el.tag) + \"> without corresponding v-if.\"\n      );\n    }\n  }\n\n  function findPrevElement (children) {\n    var i = children.length;\n    while (i--) {\n      if (children[i].type === 1) {\n        return children[i]\n      } else {\n        if (children[i].text !== ' ') {\n          warn$2(\n            \"text \\\"\" + (children[i].text.trim()) + \"\\\" between v-if and v-else(-if) \" +\n            \"will be ignored.\"\n          );\n        }\n        children.pop();\n      }\n    }\n  }\n\n  function addIfCondition (el, condition) {\n    if (!el.ifConditions) {\n      el.ifConditions = [];\n    }\n    el.ifConditions.push(condition);\n  }\n\n  function processOnce (el) {\n    var once$$1 = getAndRemoveAttr(el, 'v-once');\n    if (once$$1 != null) {\n      el.once = true;\n    }\n  }\n\n  function processSlot (el) {\n    if (el.tag === 'slot') {\n      el.slotName = getBindingAttr(el, 'name');\n      if (el.key) {\n        warn$2(\n          \"`key` does not work on <slot> because slots are abstract outlets \" +\n          \"and can possibly expand into multiple elements. \" +\n          \"Use the key on a wrapping element instead.\"\n        );\n      }\n    } else {\n      var slotScope;\n      if (el.tag === 'template') {\n        slotScope = getAndRemoveAttr(el, 'scope');\n        /* istanbul ignore if */\n        if (slotScope) {\n          warn$2(\n            \"the \\\"scope\\\" attribute for scoped slots have been deprecated and \" +\n            \"replaced by \\\"slot-scope\\\" since 2.5. The new \\\"slot-scope\\\" attribute \" +\n            \"can also be used on plain elements in addition to <template> to \" +\n            \"denote scoped slots.\",\n            true\n          );\n        }\n        el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');\n      } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {\n        /* istanbul ignore if */\n        if (el.attrsMap['v-for']) {\n          warn$2(\n            \"Ambiguous combined usage of slot-scope and v-for on <\" + (el.tag) + \"> \" +\n            \"(v-for takes higher priority). Use a wrapper <template> for the \" +\n            \"scoped slot to make it clearer.\",\n            true\n          );\n        }\n        el.slotScope = slotScope;\n      }\n      var slotTarget = getBindingAttr(el, 'slot');\n      if (slotTarget) {\n        el.slotTarget = slotTarget === '\"\"' ? '\"default\"' : slotTarget;\n        // preserve slot as an attribute for native shadow DOM compat\n        // only for non-scoped slots.\n        if (el.tag !== 'template' && !el.slotScope) {\n          addAttr(el, 'slot', slotTarget);\n        }\n      }\n    }\n  }\n\n  function processComponent (el) {\n    var binding;\n    if ((binding = getBindingAttr(el, 'is'))) {\n      el.component = binding;\n    }\n    if (getAndRemoveAttr(el, 'inline-template') != null) {\n      el.inlineTemplate = true;\n    }\n  }\n\n  function processAttrs (el) {\n    var list = el.attrsList;\n    var i, l, name, rawName, value, modifiers, isProp;\n    for (i = 0, l = list.length; i < l; i++) {\n      name = rawName = list[i].name;\n      value = list[i].value;\n      if (dirRE.test(name)) {\n        // mark element as dynamic\n        el.hasBindings = true;\n        // modifiers\n        modifiers = parseModifiers(name);\n        if (modifiers) {\n          name = name.replace(modifierRE, '');\n        }\n        if (bindRE.test(name)) { // v-bind\n          name = name.replace(bindRE, '');\n          value = parseFilters(value);\n          isProp = false;\n          if (\n            value.trim().length === 0\n          ) {\n            warn$2(\n              (\"The value for a v-bind expression cannot be empty. Found in \\\"v-bind:\" + name + \"\\\"\")\n            );\n          }\n          if (modifiers) {\n            if (modifiers.prop) {\n              isProp = true;\n              name = camelize(name);\n              if (name === 'innerHtml') { name = 'innerHTML'; }\n            }\n            if (modifiers.camel) {\n              name = camelize(name);\n            }\n            if (modifiers.sync) {\n              addHandler(\n                el,\n                (\"update:\" + (camelize(name))),\n                genAssignmentCode(value, \"$event\")\n              );\n            }\n          }\n          if (isProp || (\n            !el.component && platformMustUseProp(el.tag, el.attrsMap.type, name)\n          )) {\n            addProp(el, name, value);\n          } else {\n            addAttr(el, name, value);\n          }\n        } else if (onRE.test(name)) { // v-on\n          name = name.replace(onRE, '');\n          addHandler(el, name, value, modifiers, false, warn$2);\n        } else { // normal directives\n          name = name.replace(dirRE, '');\n          // parse arg\n          var argMatch = name.match(argRE);\n          var arg = argMatch && argMatch[1];\n          if (arg) {\n            name = name.slice(0, -(arg.length + 1));\n          }\n          addDirective(el, name, rawName, value, arg, modifiers);\n          if (name === 'model') {\n            checkForAliasModel(el, value);\n          }\n        }\n      } else {\n        // literal attribute\n        {\n          var res = parseText(value, delimiters);\n          if (res) {\n            warn$2(\n              name + \"=\\\"\" + value + \"\\\": \" +\n              'Interpolation inside attributes has been removed. ' +\n              'Use v-bind or the colon shorthand instead. For example, ' +\n              'instead of <div id=\"{{ val }}\">, use <div :id=\"val\">.'\n            );\n          }\n        }\n        addAttr(el, name, JSON.stringify(value));\n        // #6887 firefox doesn't update muted state if set via attribute\n        // even immediately after element creation\n        if (!el.component &&\n            name === 'muted' &&\n            platformMustUseProp(el.tag, el.attrsMap.type, name)) {\n          addProp(el, name, 'true');\n        }\n      }\n    }\n  }\n\n  function checkInFor (el) {\n    var parent = el;\n    while (parent) {\n      if (parent.for !== undefined) {\n        return true\n      }\n      parent = parent.parent;\n    }\n    return false\n  }\n\n  function parseModifiers (name) {\n    var match = name.match(modifierRE);\n    if (match) {\n      var ret = {};\n      match.forEach(function (m) { ret[m.slice(1)] = true; });\n      return ret\n    }\n  }\n\n  function makeAttrsMap (attrs) {\n    var map = {};\n    for (var i = 0, l = attrs.length; i < l; i++) {\n      if (\n        map[attrs[i].name] && !isIE && !isEdge\n      ) {\n        warn$2('duplicate attribute: ' + attrs[i].name);\n      }\n      map[attrs[i].name] = attrs[i].value;\n    }\n    return map\n  }\n\n  // for script (e.g. type=\"x/template\") or style, do not decode content\n  function isTextTag (el) {\n    return el.tag === 'script' || el.tag === 'style'\n  }\n\n  function isForbiddenTag (el) {\n    return (\n      el.tag === 'style' ||\n      (el.tag === 'script' && (\n        !el.attrsMap.type ||\n        el.attrsMap.type === 'text/javascript'\n      ))\n    )\n  }\n\n  var ieNSBug = /^xmlns:NS\\d+/;\n  var ieNSPrefix = /^NS\\d+:/;\n\n  /* istanbul ignore next */\n  function guardIESVGBug (attrs) {\n    var res = [];\n    for (var i = 0; i < attrs.length; i++) {\n      var attr = attrs[i];\n      if (!ieNSBug.test(attr.name)) {\n        attr.name = attr.name.replace(ieNSPrefix, '');\n        res.push(attr);\n      }\n    }\n    return res\n  }\n\n  function checkForAliasModel (el, value) {\n    var _el = el;\n    while (_el) {\n      if (_el.for && _el.alias === value) {\n        warn$2(\n          \"<\" + (el.tag) + \" v-model=\\\"\" + value + \"\\\">: \" +\n          \"You are binding v-model directly to a v-for iteration alias. \" +\n          \"This will not be able to modify the v-for source array because \" +\n          \"writing to the alias is like modifying a function local variable. \" +\n          \"Consider using an array of objects and use v-model on an object property instead.\"\n        );\n      }\n      _el = _el.parent;\n    }\n  }\n\n  /*  */\n\n  function preTransformNode (el, options) {\n    if (el.tag === 'input') {\n      var map = el.attrsMap;\n      if (!map['v-model']) {\n        return\n      }\n\n      var typeBinding;\n      if (map[':type'] || map['v-bind:type']) {\n        typeBinding = getBindingAttr(el, 'type');\n      }\n      if (!map.type && !typeBinding && map['v-bind']) {\n        typeBinding = \"(\" + (map['v-bind']) + \").type\";\n      }\n\n      if (typeBinding) {\n        var ifCondition = getAndRemoveAttr(el, 'v-if', true);\n        var ifConditionExtra = ifCondition ? (\"&&(\" + ifCondition + \")\") : \"\";\n        var hasElse = getAndRemoveAttr(el, 'v-else', true) != null;\n        var elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true);\n        // 1. checkbox\n        var branch0 = cloneASTElement(el);\n        // process for on the main node\n        processFor(branch0);\n        addRawAttr(branch0, 'type', 'checkbox');\n        processElement(branch0, options);\n        branch0.processed = true; // prevent it from double-processed\n        branch0.if = \"(\" + typeBinding + \")==='checkbox'\" + ifConditionExtra;\n        addIfCondition(branch0, {\n          exp: branch0.if,\n          block: branch0\n        });\n        // 2. add radio else-if condition\n        var branch1 = cloneASTElement(el);\n        getAndRemoveAttr(branch1, 'v-for', true);\n        addRawAttr(branch1, 'type', 'radio');\n        processElement(branch1, options);\n        addIfCondition(branch0, {\n          exp: \"(\" + typeBinding + \")==='radio'\" + ifConditionExtra,\n          block: branch1\n        });\n        // 3. other\n        var branch2 = cloneASTElement(el);\n        getAndRemoveAttr(branch2, 'v-for', true);\n        addRawAttr(branch2, ':type', typeBinding);\n        processElement(branch2, options);\n        addIfCondition(branch0, {\n          exp: ifCondition,\n          block: branch2\n        });\n\n        if (hasElse) {\n          branch0.else = true;\n        } else if (elseIfCondition) {\n          branch0.elseif = elseIfCondition;\n        }\n\n        return branch0\n      }\n    }\n  }\n\n  function cloneASTElement (el) {\n    return createASTElement(el.tag, el.attrsList.slice(), el.parent)\n  }\n\n  var model$1 = {\n    preTransformNode: preTransformNode\n  };\n\n  var modules$1 = [\n    klass$1,\n    style$1,\n    model$1\n  ];\n\n  /*  */\n\n  function text (el, dir) {\n    if (dir.value) {\n      addProp(el, 'textContent', (\"_s(\" + (dir.value) + \")\"));\n    }\n  }\n\n  /*  */\n\n  function html (el, dir) {\n    if (dir.value) {\n      addProp(el, 'innerHTML', (\"_s(\" + (dir.value) + \")\"));\n    }\n  }\n\n  var directives$1 = {\n    model: model,\n    text: text,\n    html: html\n  };\n\n  /*  */\n\n  var baseOptions = {\n    expectHTML: true,\n    modules: modules$1,\n    directives: directives$1,\n    isPreTag: isPreTag,\n    isUnaryTag: isUnaryTag,\n    mustUseProp: mustUseProp,\n    canBeLeftOpenTag: canBeLeftOpenTag,\n    isReservedTag: isReservedTag,\n    getTagNamespace: getTagNamespace,\n    staticKeys: genStaticKeys(modules$1)\n  };\n\n  /*  */\n\n  var isStaticKey;\n  var isPlatformReservedTag;\n\n  var genStaticKeysCached = cached(genStaticKeys$1);\n\n  /**\n   * Goal of the optimizer: walk the generated template AST tree\n   * and detect sub-trees that are purely static, i.e. parts of\n   * the DOM that never needs to change.\n   *\n   * Once we detect these sub-trees, we can:\n   *\n   * 1. Hoist them into constants, so that we no longer need to\n   *    create fresh nodes for them on each re-render;\n   * 2. Completely skip them in the patching process.\n   */\n  function optimize (root, options) {\n    if (!root) { return }\n    isStaticKey = genStaticKeysCached(options.staticKeys || '');\n    isPlatformReservedTag = options.isReservedTag || no;\n    // first pass: mark all non-static nodes.\n    markStatic$1(root);\n    // second pass: mark static roots.\n    markStaticRoots(root, false);\n  }\n\n  function genStaticKeys$1 (keys) {\n    return makeMap(\n      'type,tag,attrsList,attrsMap,plain,parent,children,attrs' +\n      (keys ? ',' + keys : '')\n    )\n  }\n\n  function markStatic$1 (node) {\n    node.static = isStatic(node);\n    if (node.type === 1) {\n      // do not make component slot content static. this avoids\n      // 1. components not able to mutate slot nodes\n      // 2. static slot content fails for hot-reloading\n      if (\n        !isPlatformReservedTag(node.tag) &&\n        node.tag !== 'slot' &&\n        node.attrsMap['inline-template'] == null\n      ) {\n        return\n      }\n      for (var i = 0, l = node.children.length; i < l; i++) {\n        var child = node.children[i];\n        markStatic$1(child);\n        if (!child.static) {\n          node.static = false;\n        }\n      }\n      if (node.ifConditions) {\n        for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {\n          var block = node.ifConditions[i$1].block;\n          markStatic$1(block);\n          if (!block.static) {\n            node.static = false;\n          }\n        }\n      }\n    }\n  }\n\n  function markStaticRoots (node, isInFor) {\n    if (node.type === 1) {\n      if (node.static || node.once) {\n        node.staticInFor = isInFor;\n      }\n      // For a node to qualify as a static root, it should have children that\n      // are not just static text. Otherwise the cost of hoisting out will\n      // outweigh the benefits and it's better off to just always render it fresh.\n      if (node.static && node.children.length && !(\n        node.children.length === 1 &&\n        node.children[0].type === 3\n      )) {\n        node.staticRoot = true;\n        return\n      } else {\n        node.staticRoot = false;\n      }\n      if (node.children) {\n        for (var i = 0, l = node.children.length; i < l; i++) {\n          markStaticRoots(node.children[i], isInFor || !!node.for);\n        }\n      }\n      if (node.ifConditions) {\n        for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {\n          markStaticRoots(node.ifConditions[i$1].block, isInFor);\n        }\n      }\n    }\n  }\n\n  function isStatic (node) {\n    if (node.type === 2) { // expression\n      return false\n    }\n    if (node.type === 3) { // text\n      return true\n    }\n    return !!(node.pre || (\n      !node.hasBindings && // no dynamic bindings\n      !node.if && !node.for && // not v-if or v-for or v-else\n      !isBuiltInTag(node.tag) && // not a built-in\n      isPlatformReservedTag(node.tag) && // not a component\n      !isDirectChildOfTemplateFor(node) &&\n      Object.keys(node).every(isStaticKey)\n    ))\n  }\n\n  function isDirectChildOfTemplateFor (node) {\n    while (node.parent) {\n      node = node.parent;\n      if (node.tag !== 'template') {\n        return false\n      }\n      if (node.for) {\n        return true\n      }\n    }\n    return false\n  }\n\n  /*  */\n\n  var fnExpRE = /^([\\w$_]+|\\([^)]*?\\))\\s*=>|^function\\s*\\(/;\n  var simplePathRE = /^[A-Za-z_$][\\w$]*(?:\\.[A-Za-z_$][\\w$]*|\\['[^']*?']|\\[\"[^\"]*?\"]|\\[\\d+]|\\[[A-Za-z_$][\\w$]*])*$/;\n\n  // KeyboardEvent.keyCode aliases\n  var keyCodes = {\n    esc: 27,\n    tab: 9,\n    enter: 13,\n    space: 32,\n    up: 38,\n    left: 37,\n    right: 39,\n    down: 40,\n    'delete': [8, 46]\n  };\n\n  // KeyboardEvent.key aliases\n  var keyNames = {\n    // #7880: IE11 and Edge use `Esc` for Escape key name.\n    esc: ['Esc', 'Escape'],\n    tab: 'Tab',\n    enter: 'Enter',\n    // #9112: IE11 uses `Spacebar` for Space key name.\n    space: [' ', 'Spacebar'],\n    // #7806: IE11 uses key names without `Arrow` prefix for arrow keys.\n    up: ['Up', 'ArrowUp'],\n    left: ['Left', 'ArrowLeft'],\n    right: ['Right', 'ArrowRight'],\n    down: ['Down', 'ArrowDown'],\n    // #9112: IE11 uses `Del` for Delete key name.\n    'delete': ['Backspace', 'Delete', 'Del']\n  };\n\n  // #4868: modifiers that prevent the execution of the listener\n  // need to explicitly return null so that we can determine whether to remove\n  // the listener for .once\n  var genGuard = function (condition) { return (\"if(\" + condition + \")return null;\"); };\n\n  var modifierCode = {\n    stop: '$event.stopPropagation();',\n    prevent: '$event.preventDefault();',\n    self: genGuard(\"$event.target !== $event.currentTarget\"),\n    ctrl: genGuard(\"!$event.ctrlKey\"),\n    shift: genGuard(\"!$event.shiftKey\"),\n    alt: genGuard(\"!$event.altKey\"),\n    meta: genGuard(\"!$event.metaKey\"),\n    left: genGuard(\"'button' in $event && $event.button !== 0\"),\n    middle: genGuard(\"'button' in $event && $event.button !== 1\"),\n    right: genGuard(\"'button' in $event && $event.button !== 2\")\n  };\n\n  function genHandlers (\n    events,\n    isNative\n  ) {\n    var res = isNative ? 'nativeOn:{' : 'on:{';\n    for (var name in events) {\n      res += \"\\\"\" + name + \"\\\":\" + (genHandler(name, events[name])) + \",\";\n    }\n    return res.slice(0, -1) + '}'\n  }\n\n  function genHandler (\n    name,\n    handler\n  ) {\n    if (!handler) {\n      return 'function(){}'\n    }\n\n    if (Array.isArray(handler)) {\n      return (\"[\" + (handler.map(function (handler) { return genHandler(name, handler); }).join(',')) + \"]\")\n    }\n\n    var isMethodPath = simplePathRE.test(handler.value);\n    var isFunctionExpression = fnExpRE.test(handler.value);\n\n    if (!handler.modifiers) {\n      if (isMethodPath || isFunctionExpression) {\n        return handler.value\n      }\n      return (\"function($event){\" + (handler.value) + \"}\") // inline statement\n    } else {\n      var code = '';\n      var genModifierCode = '';\n      var keys = [];\n      for (var key in handler.modifiers) {\n        if (modifierCode[key]) {\n          genModifierCode += modifierCode[key];\n          // left/right\n          if (keyCodes[key]) {\n            keys.push(key);\n          }\n        } else if (key === 'exact') {\n          var modifiers = (handler.modifiers);\n          genModifierCode += genGuard(\n            ['ctrl', 'shift', 'alt', 'meta']\n              .filter(function (keyModifier) { return !modifiers[keyModifier]; })\n              .map(function (keyModifier) { return (\"$event.\" + keyModifier + \"Key\"); })\n              .join('||')\n          );\n        } else {\n          keys.push(key);\n        }\n      }\n      if (keys.length) {\n        code += genKeyFilter(keys);\n      }\n      // Make sure modifiers like prevent and stop get executed after key filtering\n      if (genModifierCode) {\n        code += genModifierCode;\n      }\n      var handlerCode = isMethodPath\n        ? (\"return \" + (handler.value) + \"($event)\")\n        : isFunctionExpression\n          ? (\"return (\" + (handler.value) + \")($event)\")\n          : handler.value;\n      return (\"function($event){\" + code + handlerCode + \"}\")\n    }\n  }\n\n  function genKeyFilter (keys) {\n    return (\"if(!('button' in $event)&&\" + (keys.map(genFilterCode).join('&&')) + \")return null;\")\n  }\n\n  function genFilterCode (key) {\n    var keyVal = parseInt(key, 10);\n    if (keyVal) {\n      return (\"$event.keyCode!==\" + keyVal)\n    }\n    var keyCode = keyCodes[key];\n    var keyName = keyNames[key];\n    return (\n      \"_k($event.keyCode,\" +\n      (JSON.stringify(key)) + \",\" +\n      (JSON.stringify(keyCode)) + \",\" +\n      \"$event.key,\" +\n      \"\" + (JSON.stringify(keyName)) +\n      \")\"\n    )\n  }\n\n  /*  */\n\n  function on (el, dir) {\n    if (dir.modifiers) {\n      warn(\"v-on without argument does not support modifiers.\");\n    }\n    el.wrapListeners = function (code) { return (\"_g(\" + code + \",\" + (dir.value) + \")\"); };\n  }\n\n  /*  */\n\n  function bind$1 (el, dir) {\n    el.wrapData = function (code) {\n      return (\"_b(\" + code + \",'\" + (el.tag) + \"',\" + (dir.value) + \",\" + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + \")\")\n    };\n  }\n\n  /*  */\n\n  var baseDirectives = {\n    on: on,\n    bind: bind$1,\n    cloak: noop\n  };\n\n  /*  */\n\n\n\n\n\n  var CodegenState = function CodegenState (options) {\n    this.options = options;\n    this.warn = options.warn || baseWarn;\n    this.transforms = pluckModuleFunction(options.modules, 'transformCode');\n    this.dataGenFns = pluckModuleFunction(options.modules, 'genData');\n    this.directives = extend(extend({}, baseDirectives), options.directives);\n    var isReservedTag = options.isReservedTag || no;\n    this.maybeComponent = function (el) { return !(isReservedTag(el.tag) && !el.component); };\n    this.onceId = 0;\n    this.staticRenderFns = [];\n    this.pre = false;\n  };\n\n\n\n  function generate (\n    ast,\n    options\n  ) {\n    var state = new CodegenState(options);\n    var code = ast ? genElement(ast, state) : '_c(\"div\")';\n    return {\n      render: (\"with(this){return \" + code + \"}\"),\n      staticRenderFns: state.staticRenderFns\n    }\n  }\n\n  function genElement (el, state) {\n    if (el.parent) {\n      el.pre = el.pre || el.parent.pre;\n    }\n\n    if (el.staticRoot && !el.staticProcessed) {\n      return genStatic(el, state)\n    } else if (el.once && !el.onceProcessed) {\n      return genOnce(el, state)\n    } else if (el.for && !el.forProcessed) {\n      return genFor(el, state)\n    } else if (el.if && !el.ifProcessed) {\n      return genIf(el, state)\n    } else if (el.tag === 'template' && !el.slotTarget && !state.pre) {\n      return genChildren(el, state) || 'void 0'\n    } else if (el.tag === 'slot') {\n      return genSlot(el, state)\n    } else {\n      // component or element\n      var code;\n      if (el.component) {\n        code = genComponent(el.component, el, state);\n      } else {\n        var data;\n        if (!el.plain || (el.pre && state.maybeComponent(el))) {\n          data = genData$2(el, state);\n        }\n\n        var children = el.inlineTemplate ? null : genChildren(el, state, true);\n        code = \"_c('\" + (el.tag) + \"'\" + (data ? (\",\" + data) : '') + (children ? (\",\" + children) : '') + \")\";\n      }\n      // module transforms\n      for (var i = 0; i < state.transforms.length; i++) {\n        code = state.transforms[i](el, code);\n      }\n      return code\n    }\n  }\n\n  // hoist static sub-trees out\n  function genStatic (el, state) {\n    el.staticProcessed = true;\n    // Some elements (templates) need to behave differently inside of a v-pre\n    // node.  All pre nodes are static roots, so we can use this as a location to\n    // wrap a state change and reset it upon exiting the pre node.\n    var originalPreState = state.pre;\n    if (el.pre) {\n      state.pre = el.pre;\n    }\n    state.staticRenderFns.push((\"with(this){return \" + (genElement(el, state)) + \"}\"));\n    state.pre = originalPreState;\n    return (\"_m(\" + (state.staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + \")\")\n  }\n\n  // v-once\n  function genOnce (el, state) {\n    el.onceProcessed = true;\n    if (el.if && !el.ifProcessed) {\n      return genIf(el, state)\n    } else if (el.staticInFor) {\n      var key = '';\n      var parent = el.parent;\n      while (parent) {\n        if (parent.for) {\n          key = parent.key;\n          break\n        }\n        parent = parent.parent;\n      }\n      if (!key) {\n        state.warn(\n          \"v-once can only be used inside v-for that is keyed. \"\n        );\n        return genElement(el, state)\n      }\n      return (\"_o(\" + (genElement(el, state)) + \",\" + (state.onceId++) + \",\" + key + \")\")\n    } else {\n      return genStatic(el, state)\n    }\n  }\n\n  function genIf (\n    el,\n    state,\n    altGen,\n    altEmpty\n  ) {\n    el.ifProcessed = true; // avoid recursion\n    return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)\n  }\n\n  function genIfConditions (\n    conditions,\n    state,\n    altGen,\n    altEmpty\n  ) {\n    if (!conditions.length) {\n      return altEmpty || '_e()'\n    }\n\n    var condition = conditions.shift();\n    if (condition.exp) {\n      return (\"(\" + (condition.exp) + \")?\" + (genTernaryExp(condition.block)) + \":\" + (genIfConditions(conditions, state, altGen, altEmpty)))\n    } else {\n      return (\"\" + (genTernaryExp(condition.block)))\n    }\n\n    // v-if with v-once should generate code like (a)?_m(0):_m(1)\n    function genTernaryExp (el) {\n      return altGen\n        ? altGen(el, state)\n        : el.once\n          ? genOnce(el, state)\n          : genElement(el, state)\n    }\n  }\n\n  function genFor (\n    el,\n    state,\n    altGen,\n    altHelper\n  ) {\n    var exp = el.for;\n    var alias = el.alias;\n    var iterator1 = el.iterator1 ? (\",\" + (el.iterator1)) : '';\n    var iterator2 = el.iterator2 ? (\",\" + (el.iterator2)) : '';\n\n    if (state.maybeComponent(el) &&\n      el.tag !== 'slot' &&\n      el.tag !== 'template' &&\n      !el.key\n    ) {\n      state.warn(\n        \"<\" + (el.tag) + \" v-for=\\\"\" + alias + \" in \" + exp + \"\\\">: component lists rendered with \" +\n        \"v-for should have explicit keys. \" +\n        \"See https://vuejs.org/guide/list.html#key for more info.\",\n        true /* tip */\n      );\n    }\n\n    el.forProcessed = true; // avoid recursion\n    return (altHelper || '_l') + \"((\" + exp + \"),\" +\n      \"function(\" + alias + iterator1 + iterator2 + \"){\" +\n        \"return \" + ((altGen || genElement)(el, state)) +\n      '})'\n  }\n\n  function genData$2 (el, state) {\n    var data = '{';\n\n    // directives first.\n    // directives may mutate the el's other properties before they are generated.\n    var dirs = genDirectives(el, state);\n    if (dirs) { data += dirs + ','; }\n\n    // key\n    if (el.key) {\n      data += \"key:\" + (el.key) + \",\";\n    }\n    // ref\n    if (el.ref) {\n      data += \"ref:\" + (el.ref) + \",\";\n    }\n    if (el.refInFor) {\n      data += \"refInFor:true,\";\n    }\n    // pre\n    if (el.pre) {\n      data += \"pre:true,\";\n    }\n    // record original tag name for components using \"is\" attribute\n    if (el.component) {\n      data += \"tag:\\\"\" + (el.tag) + \"\\\",\";\n    }\n    // module data generation functions\n    for (var i = 0; i < state.dataGenFns.length; i++) {\n      data += state.dataGenFns[i](el);\n    }\n    // attributes\n    if (el.attrs) {\n      data += \"attrs:{\" + (genProps(el.attrs)) + \"},\";\n    }\n    // DOM props\n    if (el.props) {\n      data += \"domProps:{\" + (genProps(el.props)) + \"},\";\n    }\n    // event handlers\n    if (el.events) {\n      data += (genHandlers(el.events, false)) + \",\";\n    }\n    if (el.nativeEvents) {\n      data += (genHandlers(el.nativeEvents, true)) + \",\";\n    }\n    // slot target\n    // only for non-scoped slots\n    if (el.slotTarget && !el.slotScope) {\n      data += \"slot:\" + (el.slotTarget) + \",\";\n    }\n    // scoped slots\n    if (el.scopedSlots) {\n      data += (genScopedSlots(el.scopedSlots, state)) + \",\";\n    }\n    // component v-model\n    if (el.model) {\n      data += \"model:{value:\" + (el.model.value) + \",callback:\" + (el.model.callback) + \",expression:\" + (el.model.expression) + \"},\";\n    }\n    // inline-template\n    if (el.inlineTemplate) {\n      var inlineTemplate = genInlineTemplate(el, state);\n      if (inlineTemplate) {\n        data += inlineTemplate + \",\";\n      }\n    }\n    data = data.replace(/,$/, '') + '}';\n    // v-bind data wrap\n    if (el.wrapData) {\n      data = el.wrapData(data);\n    }\n    // v-on data wrap\n    if (el.wrapListeners) {\n      data = el.wrapListeners(data);\n    }\n    return data\n  }\n\n  function genDirectives (el, state) {\n    var dirs = el.directives;\n    if (!dirs) { return }\n    var res = 'directives:[';\n    var hasRuntime = false;\n    var i, l, dir, needRuntime;\n    for (i = 0, l = dirs.length; i < l; i++) {\n      dir = dirs[i];\n      needRuntime = true;\n      var gen = state.directives[dir.name];\n      if (gen) {\n        // compile-time directive that manipulates AST.\n        // returns true if it also needs a runtime counterpart.\n        needRuntime = !!gen(el, dir, state.warn);\n      }\n      if (needRuntime) {\n        hasRuntime = true;\n        res += \"{name:\\\"\" + (dir.name) + \"\\\",rawName:\\\"\" + (dir.rawName) + \"\\\"\" + (dir.value ? (\",value:(\" + (dir.value) + \"),expression:\" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (\",arg:\\\"\" + (dir.arg) + \"\\\"\") : '') + (dir.modifiers ? (\",modifiers:\" + (JSON.stringify(dir.modifiers))) : '') + \"},\";\n      }\n    }\n    if (hasRuntime) {\n      return res.slice(0, -1) + ']'\n    }\n  }\n\n  function genInlineTemplate (el, state) {\n    var ast = el.children[0];\n    if (el.children.length !== 1 || ast.type !== 1) {\n      state.warn('Inline-template components must have exactly one child element.');\n    }\n    if (ast.type === 1) {\n      var inlineRenderFns = generate(ast, state.options);\n      return (\"inlineTemplate:{render:function(){\" + (inlineRenderFns.render) + \"},staticRenderFns:[\" + (inlineRenderFns.staticRenderFns.map(function (code) { return (\"function(){\" + code + \"}\"); }).join(',')) + \"]}\")\n    }\n  }\n\n  function genScopedSlots (\n    slots,\n    state\n  ) {\n    return (\"scopedSlots:_u([\" + (Object.keys(slots).map(function (key) {\n        return genScopedSlot(key, slots[key], state)\n      }).join(',')) + \"])\")\n  }\n\n  function genScopedSlot (\n    key,\n    el,\n    state\n  ) {\n    if (el.for && !el.forProcessed) {\n      return genForScopedSlot(key, el, state)\n    }\n    var fn = \"function(\" + (String(el.slotScope)) + \"){\" +\n      \"return \" + (el.tag === 'template'\n        ? el.if\n          ? (\"(\" + (el.if) + \")?\" + (genChildren(el, state) || 'undefined') + \":undefined\")\n          : genChildren(el, state) || 'undefined'\n        : genElement(el, state)) + \"}\";\n    return (\"{key:\" + key + \",fn:\" + fn + \"}\")\n  }\n\n  function genForScopedSlot (\n    key,\n    el,\n    state\n  ) {\n    var exp = el.for;\n    var alias = el.alias;\n    var iterator1 = el.iterator1 ? (\",\" + (el.iterator1)) : '';\n    var iterator2 = el.iterator2 ? (\",\" + (el.iterator2)) : '';\n    el.forProcessed = true; // avoid recursion\n    return \"_l((\" + exp + \"),\" +\n      \"function(\" + alias + iterator1 + iterator2 + \"){\" +\n        \"return \" + (genScopedSlot(key, el, state)) +\n      '})'\n  }\n\n  function genChildren (\n    el,\n    state,\n    checkSkip,\n    altGenElement,\n    altGenNode\n  ) {\n    var children = el.children;\n    if (children.length) {\n      var el$1 = children[0];\n      // optimize single v-for\n      if (children.length === 1 &&\n        el$1.for &&\n        el$1.tag !== 'template' &&\n        el$1.tag !== 'slot'\n      ) {\n        var normalizationType = checkSkip\n          ? state.maybeComponent(el$1) ? \",1\" : \",0\"\n          : \"\";\n        return (\"\" + ((altGenElement || genElement)(el$1, state)) + normalizationType)\n      }\n      var normalizationType$1 = checkSkip\n        ? getNormalizationType(children, state.maybeComponent)\n        : 0;\n      var gen = altGenNode || genNode;\n      return (\"[\" + (children.map(function (c) { return gen(c, state); }).join(',')) + \"]\" + (normalizationType$1 ? (\",\" + normalizationType$1) : ''))\n    }\n  }\n\n  // determine the normalization needed for the children array.\n  // 0: no normalization needed\n  // 1: simple normalization needed (possible 1-level deep nested array)\n  // 2: full normalization needed\n  function getNormalizationType (\n    children,\n    maybeComponent\n  ) {\n    var res = 0;\n    for (var i = 0; i < children.length; i++) {\n      var el = children[i];\n      if (el.type !== 1) {\n        continue\n      }\n      if (needsNormalization(el) ||\n          (el.ifConditions && el.ifConditions.some(function (c) { return needsNormalization(c.block); }))) {\n        res = 2;\n        break\n      }\n      if (maybeComponent(el) ||\n          (el.ifConditions && el.ifConditions.some(function (c) { return maybeComponent(c.block); }))) {\n        res = 1;\n      }\n    }\n    return res\n  }\n\n  function needsNormalization (el) {\n    return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'\n  }\n\n  function genNode (node, state) {\n    if (node.type === 1) {\n      return genElement(node, state)\n    } else if (node.type === 3 && node.isComment) {\n      return genComment(node)\n    } else {\n      return genText(node)\n    }\n  }\n\n  function genText (text) {\n    return (\"_v(\" + (text.type === 2\n      ? text.expression // no need for () because already wrapped in _s()\n      : transformSpecialNewlines(JSON.stringify(text.text))) + \")\")\n  }\n\n  function genComment (comment) {\n    return (\"_e(\" + (JSON.stringify(comment.text)) + \")\")\n  }\n\n  function genSlot (el, state) {\n    var slotName = el.slotName || '\"default\"';\n    var children = genChildren(el, state);\n    var res = \"_t(\" + slotName + (children ? (\",\" + children) : '');\n    var attrs = el.attrs && (\"{\" + (el.attrs.map(function (a) { return ((camelize(a.name)) + \":\" + (a.value)); }).join(',')) + \"}\");\n    var bind$$1 = el.attrsMap['v-bind'];\n    if ((attrs || bind$$1) && !children) {\n      res += \",null\";\n    }\n    if (attrs) {\n      res += \",\" + attrs;\n    }\n    if (bind$$1) {\n      res += (attrs ? '' : ',null') + \",\" + bind$$1;\n    }\n    return res + ')'\n  }\n\n  // componentName is el.component, take it as argument to shun flow's pessimistic refinement\n  function genComponent (\n    componentName,\n    el,\n    state\n  ) {\n    var children = el.inlineTemplate ? null : genChildren(el, state, true);\n    return (\"_c(\" + componentName + \",\" + (genData$2(el, state)) + (children ? (\",\" + children) : '') + \")\")\n  }\n\n  function genProps (props) {\n    var res = '';\n    for (var i = 0; i < props.length; i++) {\n      var prop = props[i];\n      /* istanbul ignore if */\n      {\n        res += \"\\\"\" + (prop.name) + \"\\\":\" + (transformSpecialNewlines(prop.value)) + \",\";\n      }\n    }\n    return res.slice(0, -1)\n  }\n\n  // #3895, #4268\n  function transformSpecialNewlines (text) {\n    return text\n      .replace(/\\u2028/g, '\\\\u2028')\n      .replace(/\\u2029/g, '\\\\u2029')\n  }\n\n  /*  */\n\n  // these keywords should not appear inside expressions, but operators like\n  // typeof, instanceof and in are allowed\n  var prohibitedKeywordRE = new RegExp('\\\\b' + (\n    'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +\n    'super,throw,while,yield,delete,export,import,return,switch,default,' +\n    'extends,finally,continue,debugger,function,arguments'\n  ).split(',').join('\\\\b|\\\\b') + '\\\\b');\n\n  // these unary operators should not be used as property/method names\n  var unaryOperatorsRE = new RegExp('\\\\b' + (\n    'delete,typeof,void'\n  ).split(',').join('\\\\s*\\\\([^\\\\)]*\\\\)|\\\\b') + '\\\\s*\\\\([^\\\\)]*\\\\)');\n\n  // strip strings in expressions\n  var stripStringRE = /'(?:[^'\\\\]|\\\\.)*'|\"(?:[^\"\\\\]|\\\\.)*\"|`(?:[^`\\\\]|\\\\.)*\\$\\{|\\}(?:[^`\\\\]|\\\\.)*`|`(?:[^`\\\\]|\\\\.)*`/g;\n\n  // detect problematic expressions in a template\n  function detectErrors (ast) {\n    var errors = [];\n    if (ast) {\n      checkNode(ast, errors);\n    }\n    return errors\n  }\n\n  function checkNode (node, errors) {\n    if (node.type === 1) {\n      for (var name in node.attrsMap) {\n        if (dirRE.test(name)) {\n          var value = node.attrsMap[name];\n          if (value) {\n            if (name === 'v-for') {\n              checkFor(node, (\"v-for=\\\"\" + value + \"\\\"\"), errors);\n            } else if (onRE.test(name)) {\n              checkEvent(value, (name + \"=\\\"\" + value + \"\\\"\"), errors);\n            } else {\n              checkExpression(value, (name + \"=\\\"\" + value + \"\\\"\"), errors);\n            }\n          }\n        }\n      }\n      if (node.children) {\n        for (var i = 0; i < node.children.length; i++) {\n          checkNode(node.children[i], errors);\n        }\n      }\n    } else if (node.type === 2) {\n      checkExpression(node.expression, node.text, errors);\n    }\n  }\n\n  function checkEvent (exp, text, errors) {\n    var stipped = exp.replace(stripStringRE, '');\n    var keywordMatch = stipped.match(unaryOperatorsRE);\n    if (keywordMatch && stipped.charAt(keywordMatch.index - 1) !== '$') {\n      errors.push(\n        \"avoid using JavaScript unary operator as property name: \" +\n        \"\\\"\" + (keywordMatch[0]) + \"\\\" in expression \" + (text.trim())\n      );\n    }\n    checkExpression(exp, text, errors);\n  }\n\n  function checkFor (node, text, errors) {\n    checkExpression(node.for || '', text, errors);\n    checkIdentifier(node.alias, 'v-for alias', text, errors);\n    checkIdentifier(node.iterator1, 'v-for iterator', text, errors);\n    checkIdentifier(node.iterator2, 'v-for iterator', text, errors);\n  }\n\n  function checkIdentifier (\n    ident,\n    type,\n    text,\n    errors\n  ) {\n    if (typeof ident === 'string') {\n      try {\n        new Function((\"var \" + ident + \"=_\"));\n      } catch (e) {\n        errors.push((\"invalid \" + type + \" \\\"\" + ident + \"\\\" in expression: \" + (text.trim())));\n      }\n    }\n  }\n\n  function checkExpression (exp, text, errors) {\n    try {\n      new Function((\"return \" + exp));\n    } catch (e) {\n      var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);\n      if (keywordMatch) {\n        errors.push(\n          \"avoid using JavaScript keyword as property name: \" +\n          \"\\\"\" + (keywordMatch[0]) + \"\\\"\\n  Raw expression: \" + (text.trim())\n        );\n      } else {\n        errors.push(\n          \"invalid expression: \" + (e.message) + \" in\\n\\n\" +\n          \"    \" + exp + \"\\n\\n\" +\n          \"  Raw expression: \" + (text.trim()) + \"\\n\"\n        );\n      }\n    }\n  }\n\n  /*  */\n\n\n\n  function createFunction (code, errors) {\n    try {\n      return new Function(code)\n    } catch (err) {\n      errors.push({ err: err, code: code });\n      return noop\n    }\n  }\n\n  function createCompileToFunctionFn (compile) {\n    var cache = Object.create(null);\n\n    return function compileToFunctions (\n      template,\n      options,\n      vm\n    ) {\n      options = extend({}, options);\n      var warn$$1 = options.warn || warn;\n      delete options.warn;\n\n      /* istanbul ignore if */\n      {\n        // detect possible CSP restriction\n        try {\n          new Function('return 1');\n        } catch (e) {\n          if (e.toString().match(/unsafe-eval|CSP/)) {\n            warn$$1(\n              'It seems you are using the standalone build of Vue.js in an ' +\n              'environment with Content Security Policy that prohibits unsafe-eval. ' +\n              'The template compiler cannot work in this environment. Consider ' +\n              'relaxing the policy to allow unsafe-eval or pre-compiling your ' +\n              'templates into render functions.'\n            );\n          }\n        }\n      }\n\n      // check cache\n      var key = options.delimiters\n        ? String(options.delimiters) + template\n        : template;\n      if (cache[key]) {\n        return cache[key]\n      }\n\n      // compile\n      var compiled = compile(template, options);\n\n      // check compilation errors/tips\n      {\n        if (compiled.errors && compiled.errors.length) {\n          warn$$1(\n            \"Error compiling template:\\n\\n\" + template + \"\\n\\n\" +\n            compiled.errors.map(function (e) { return (\"- \" + e); }).join('\\n') + '\\n',\n            vm\n          );\n        }\n        if (compiled.tips && compiled.tips.length) {\n          compiled.tips.forEach(function (msg) { return tip(msg, vm); });\n        }\n      }\n\n      // turn code into functions\n      var res = {};\n      var fnGenErrors = [];\n      res.render = createFunction(compiled.render, fnGenErrors);\n      res.staticRenderFns = compiled.staticRenderFns.map(function (code) {\n        return createFunction(code, fnGenErrors)\n      });\n\n      // check function generation errors.\n      // this should only happen if there is a bug in the compiler itself.\n      // mostly for codegen development use\n      /* istanbul ignore if */\n      {\n        if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {\n          warn$$1(\n            \"Failed to generate render function:\\n\\n\" +\n            fnGenErrors.map(function (ref) {\n              var err = ref.err;\n              var code = ref.code;\n\n              return ((err.toString()) + \" in\\n\\n\" + code + \"\\n\");\n          }).join('\\n'),\n            vm\n          );\n        }\n      }\n\n      return (cache[key] = res)\n    }\n  }\n\n  /*  */\n\n  function createCompilerCreator (baseCompile) {\n    return function createCompiler (baseOptions) {\n      function compile (\n        template,\n        options\n      ) {\n        var finalOptions = Object.create(baseOptions);\n        var errors = [];\n        var tips = [];\n        finalOptions.warn = function (msg, tip) {\n          (tip ? tips : errors).push(msg);\n        };\n\n        if (options) {\n          // merge custom modules\n          if (options.modules) {\n            finalOptions.modules =\n              (baseOptions.modules || []).concat(options.modules);\n          }\n          // merge custom directives\n          if (options.directives) {\n            finalOptions.directives = extend(\n              Object.create(baseOptions.directives || null),\n              options.directives\n            );\n          }\n          // copy other options\n          for (var key in options) {\n            if (key !== 'modules' && key !== 'directives') {\n              finalOptions[key] = options[key];\n            }\n          }\n        }\n\n        var compiled = baseCompile(template, finalOptions);\n        {\n          errors.push.apply(errors, detectErrors(compiled.ast));\n        }\n        compiled.errors = errors;\n        compiled.tips = tips;\n        return compiled\n      }\n\n      return {\n        compile: compile,\n        compileToFunctions: createCompileToFunctionFn(compile)\n      }\n    }\n  }\n\n  /*  */\n\n  // `createCompilerCreator` allows creating compilers that use alternative\n  // parser/optimizer/codegen, e.g the SSR optimizing compiler.\n  // Here we just export a default compiler using the default parts.\n  var createCompiler = createCompilerCreator(function baseCompile (\n    template,\n    options\n  ) {\n    var ast = parse(template.trim(), options);\n    if (options.optimize !== false) {\n      optimize(ast, options);\n    }\n    var code = generate(ast, options);\n    return {\n      ast: ast,\n      render: code.render,\n      staticRenderFns: code.staticRenderFns\n    }\n  });\n\n  /*  */\n\n  var ref$1 = createCompiler(baseOptions);\n  var compile = ref$1.compile;\n  var compileToFunctions = ref$1.compileToFunctions;\n\n  /*  */\n\n  // check whether current browser encodes a char inside attribute values\n  var div;\n  function getShouldDecode (href) {\n    div = div || document.createElement('div');\n    div.innerHTML = href ? \"<a href=\\\"\\n\\\"/>\" : \"<div a=\\\"\\n\\\"/>\";\n    return div.innerHTML.indexOf('&#10;') > 0\n  }\n\n  // #3663: IE encodes newlines inside attribute values while other browsers don't\n  var shouldDecodeNewlines = inBrowser ? getShouldDecode(false) : false;\n  // #6828: chrome encodes content in a[href]\n  var shouldDecodeNewlinesForHref = inBrowser ? getShouldDecode(true) : false;\n\n  /*  */\n\n  var idToTemplate = cached(function (id) {\n    var el = query(id);\n    return el && el.innerHTML\n  });\n\n  var mount = Vue.prototype.$mount;\n  Vue.prototype.$mount = function (\n    el,\n    hydrating\n  ) {\n    el = el && query(el);\n\n    /* istanbul ignore if */\n    if (el === document.body || el === document.documentElement) {\n      warn(\n        \"Do not mount Vue to <html> or <body> - mount to normal elements instead.\"\n      );\n      return this\n    }\n\n    var options = this.$options;\n    // resolve template/el and convert to render function\n    if (!options.render) {\n      var template = options.template;\n      if (template) {\n        if (typeof template === 'string') {\n          if (template.charAt(0) === '#') {\n            template = idToTemplate(template);\n            /* istanbul ignore if */\n            if (!template) {\n              warn(\n                (\"Template element not found or is empty: \" + (options.template)),\n                this\n              );\n            }\n          }\n        } else if (template.nodeType) {\n          template = template.innerHTML;\n        } else {\n          {\n            warn('invalid template option:' + template, this);\n          }\n          return this\n        }\n      } else if (el) {\n        template = getOuterHTML(el);\n      }\n      if (template) {\n        /* istanbul ignore if */\n        if (config.performance && mark) {\n          mark('compile');\n        }\n\n        var ref = compileToFunctions(template, {\n          shouldDecodeNewlines: shouldDecodeNewlines,\n          shouldDecodeNewlinesForHref: shouldDecodeNewlinesForHref,\n          delimiters: options.delimiters,\n          comments: options.comments\n        }, this);\n        var render = ref.render;\n        var staticRenderFns = ref.staticRenderFns;\n        options.render = render;\n        options.staticRenderFns = staticRenderFns;\n\n        /* istanbul ignore if */\n        if (config.performance && mark) {\n          mark('compile end');\n          measure((\"vue \" + (this._name) + \" compile\"), 'compile', 'compile end');\n        }\n      }\n    }\n    return mount.call(this, el, hydrating)\n  };\n\n  /**\n   * Get outerHTML of elements, taking care\n   * of SVG elements in IE as well.\n   */\n  function getOuterHTML (el) {\n    if (el.outerHTML) {\n      return el.outerHTML\n    } else {\n      var container = document.createElement('div');\n      container.appendChild(el.cloneNode(true));\n      return container.innerHTML\n    }\n  }\n\n  Vue.compile = compileToFunctions;\n\n  return Vue;\n\n})));\n"],"sourceRoot":""}