text: /**
   * vue-paginate v0.0.1
   * (c) 2018 Taha Shashtari
   * @license MIT
   */
  (function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define(factory) :
    (global.VuePaginate = factory());
  }(this, function () { 'use strict';
  
    var warn = function () {}
    var formatComponentName
  
    var hasConsole = typeof console !== 'undefined'
  
    warn = function (msg, vm, type) {
      if ( type === void 0 ) type = 'error';
  
      if (hasConsole) {
        console[type]("[vue-paginate]: " + msg + " " + (
          vm ? formatLocation(formatComponentName(vm)) : ''
          ))
      }
    }
  
    formatComponentName = function (vm) {
      if (vm.$root === vm) {
        return 'root instance'
      }
      var name = vm._isVue
      ? vm.$options.name || vm.$options._componentTag
      : vm.name
      return (
        (name ? ("component <" + name + ">") : "anonymous component") +
        (vm._isVue && vm.$options.__file ? (" at " + (vm.$options.__file)) : '')
        )
    }
  
    var formatLocation = function (str) {
      if (str === 'anonymous component') {
        str += " - use the \"name\" option for better debugging messages."
      }
      return ("\n(found in " + str + ")")
    }
  
    var Paginate = {
      name: 'paginate',
      props: {
        name: {
          type: String,
          required: true
        },
        list: {
          type: Array,
          required: true
        },
        per: {
          type: Number,
          default: 3,
          validator: function validator (value) {
            return value > 0
          }
        },
        tag: {
          type: String,
          default: 'ul'
        }
      },
      data: function data () {
        return {
          initialListSize: this.list.length
        }
      },
      computed: {
        currentPage: {
          get: function get () {
            if (this.$parent.paginate[this.name]) {
              return this.$parent.paginate[this.name].page
            }
          },
          set: function set (page) {
            this.$parent.paginate[this.name].page = page
          }
        },
        pageItemsCount: function pageItemsCount () {
          var numOfItems = this.list.length
          var first = this.currentPage * this.per + 1
          var last = Math.min((this.currentPage * this.per) + this.per, numOfItems)
          return (first + "-" + last + " of " + numOfItems)
        }
      },
      mounted: function mounted () {
        if (this.per <= 0) {
          warn(("<paginate name=\"" + (this.name) + "\"> 'per' prop can't be 0 or less."), this.$parent)
        }
        if (!this.$parent.paginate[this.name]) {
          warn(("'" + (this.name) + "' is not registered in 'paginate' array."), this.$parent)
          return
        }
        this.paginateList()
      },
      watch: {
        currentPage: function currentPage () {
          this.paginateList()
        },
        list: function list () {
          if (this.initialListSize !== this.list.length) {
            // On list change, refresh the paginated list only if list size has changed
            this.currentPage = 0
          }
          this.paginateList()
        },
        per: function per () {
          this.currentPage = 0
          this.paginateList()
        }
      },
      methods: {
        paginateList: function paginateList () {
          var index = this.currentPage * this.per
          var paginatedList = this.list.slice(index, index + this.per)
          this.$parent.paginate[this.name].list = paginatedList
        },
        goToPage: function goToPage (page) {
          var maxPage = Math.ceil(this.list.length / this.per)
          if (page > maxPage) {
            warn(("You cannot go to page " + page + ". The last page is " + maxPage + "."), this.$parent)
            return
          }
          this.currentPage = page - 1
        }
      },
      render: function render (h) {
        return h(this.tag, {}, this.$slots.default)
      }
    }
  
    /*!
     * Vue.js v2.3.3
     * (c) 2014-2017 Evan You
     * Released under the MIT License.
     */
    /*  */
  
    // these helpers produces better vm code in JS engines due to their
    // explicitness and function inlining
    function isUndef (v) {
      return v === undefined || v === null
    }
  
    function isDef (v) {
      return v !== undefined && v !== null
    }
  
    function isTrue (v) {
      return v === true
    }
  
    function isFalse (v) {
      return v === false
    }
    /**
     * Check if value is primitive
     */
    function isPrimitive (value) {
      return typeof value === 'string' || typeof value === 'number'
    }
  
    /**
     * Quick object check - this is primarily used to tell
     * Objects from primitive values when we know the value
     * is a JSON-compliant type.
     */
    function isObject (obj) {
      return obj !== null && typeof obj === 'object'
    }
  
    var _toString = Object.prototype.toString;
  
    /**
     * Strict object type check. Only returns true
     * for plain JavaScript objects.
     */
    function isPlainObject (obj) {
      return _toString.call(obj) === '[object Object]'
    }
  
    function isRegExp (v) {
      return _toString.call(v) === '[object RegExp]'
    }
  
    /**
     * Convert a value to a string that is actually rendered.
     */
    function toString (val) {
      return val == null
        ? ''
        : typeof val === 'object'
          ? JSON.stringify(val, null, 2)
          : String(val)
    }
  
    /**
     * Convert a input value to a number for persistence.
     * If the conversion fails, return original string.
     */
    function toNumber (val) {
      var n = parseFloat(val);
      return isNaN(n) ? val : n
    }
  
    /**
     * Make a map and return a function for checking if a key
     * is in that map.
     */
    function makeMap (
      str,
      expectsLowerCase
    ) {
      var map = Object.create(null);
      var list = str.split(',');
      for (var i = 0; i < list.length; i++) {
        map[list[i]] = true;
      }
      return expectsLowerCase
        ? function (val) { return map[val.toLowerCase()]; }
        : function (val) { return map[val]; }
    }
  
    /**
     * Check if a tag is a built-in tag.
     */
    var isBuiltInTag = makeMap('slot,component', true);
  
    /**
     * Remove an item from an array
     */
    function remove (arr, item) {
      if (arr.length) {
        var index = arr.indexOf(item);
        if (index > -1) {
          return arr.splice(index, 1)
        }
      }
    }
  
    /**
     * Check whether the object has the property.
     */
    var hasOwnProperty = Object.prototype.hasOwnProperty;
    function hasOwn (obj, key) {
      return hasOwnProperty.call(obj, key)
    }
  
    /**
     * Create a cached version of a pure function.
     */
    function cached (fn) {
      var cache = Object.create(null);
      return (function cachedFn (str) {
        var hit = cache[str];
        return hit || (cache[str] = fn(str))
      })
    }
  
    /**
     * Camelize a hyphen-delimited string.
     */
    var camelizeRE = /-(\w)/g;
    var camelize = cached(function (str) {
      return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
    });
  
    /**
     * Capitalize a string.
     */
    var capitalize = cached(function (str) {
      return str.charAt(0).toUpperCase() + str.slice(1)
    });
  
    /**
     * Hyphenate a camelCase string.
     */
    var hyphenateRE = /([^-])([A-Z])/g;
    var hyphenate = cached(function (str) {
      return str
        .replace(hyphenateRE, '$1-$2')
        .replace(hyphenateRE, '$1-$2')
        .toLowerCase()
    });
  
    /**
     * Simple bind, faster than native
     */
    function bind (fn, ctx) {
      function boundFn (a) {
        var l = arguments.length;
        return l
          ? l > 1
            ? fn.apply(ctx, arguments)
            : fn.call(ctx, a)
          : fn.call(ctx)
      }
      // record original fn length
      boundFn._length = fn.length;
      return boundFn
    }
  
    /**
     * Convert an Array-like object to a real Array.
     */
    function toArray (list, start) {
      start = start || 0;
      var i = list.length - start;
      var ret = new Array(i);
      while (i--) {
        ret[i] = list[i + start];
      }
      return ret
    }
  
    /**
     * Mix properties into target object.
     */
    function extend (to, _from) {
      for (var key in _from) {
        to[key] = _from[key];
      }
      return to
    }
  
    /**
     * Merge an Array of Objects into a single Object.
     */
    function toObject (arr) {
      var res = {};
      for (var i = 0; i < arr.length; i++) {
        if (arr[i]) {
          extend(res, arr[i]);
        }
      }
      return res
    }
  
    /**
     * Perform no operation.
     */
    function noop () {}
  
    /**
     * Always return false.
     */
    var no = function () { return false; };
  
    /**
     * Return same value
     */
    var identity = function (_) { return _; };
  
    /**
     * Generate a static keys string from compiler modules.
     */
  
  
    /**
     * Check if two values are loosely equal - that is,
     * if they are plain objects, do they have the same shape?
     */
    function looseEqual (a, b) {
      var isObjectA = isObject(a);
      var isObjectB = isObject(b);
      if (isObjectA && isObjectB) {
        try {
          return JSON.stringify(a) === JSON.stringify(b)
        } catch (e) {
          // possible circular reference
          return a === b
        }
      } else if (!isObjectA && !isObjectB) {
        return String(a) === String(b)
      } else {
        return false
      }
    }
  
    function looseIndexOf (arr, val) {
      for (var i = 0; i < arr.length; i++) {
        if (looseEqual(arr[i], val)) { return i }
      }
      return -1
    }
  
    /**
     * Ensure a function is called only once.
     */
    function once (fn) {
      var called = false;
      return function () {
        if (!called) {
          called = true;
          fn.apply(this, arguments);
        }
      }
    }
  
    var SSR_ATTR = 'data-server-rendered';
  
    var ASSET_TYPES = [
      'component',
      'directive',
      'filter'
    ];
  
    var LIFECYCLE_HOOKS = [
      'beforeCreate',
      'created',
      'beforeMount',
      'mounted',
      'beforeUpdate',
      'updated',
      'beforeDestroy',
      'destroyed',
      'activated',
      'deactivated'
    ];
  
    /*  */
  
    var config = ({
      /**
       * Option merge strategies (used in core/util/options)
       */
      optionMergeStrategies: Object.create(null),
  
      /**
       * Whether to suppress warnings.
       */
      silent: false,
  
      /**
       * Show production mode tip message on boot?
       */
      productionTip: "production" !== 'production',
  
      /**
       * Whether to enable devtools
       */
      devtools: "production" !== 'production',
  
      /**
       * Whether to record perf
       */
      performance: false,
  
      /**
       * Error handler for watcher errors
       */
      errorHandler: null,
  
      /**
       * Ignore certain custom elements
       */
      ignoredElements: [],
  
      /**
       * Custom user key aliases for v-on
       */
      keyCodes: Object.create(null),
  
      /**
       * Check if a tag is reserved so that it cannot be registered as a
       * component. This is platform-dependent and may be overwritten.
       */
      isReservedTag: no,
  
      /**
       * Check if an attribute is reserved so that it cannot be used as a component
       * prop. This is platform-dependent and may be overwritten.
       */
      isReservedAttr: no,
  
      /**
       * Check if a tag is an unknown element.
       * Platform-dependent.
       */
      isUnknownElement: no,
  
      /**
       * Get the namespace of an element
       */
      getTagNamespace: noop,
  
      /**
       * Parse the real tag name for the specific platform.
       */
      parsePlatformTagName: identity,
  
      /**
       * Check if an attribute must be bound using property, e.g. value
       * Platform-dependent.
       */
      mustUseProp: no,
  
      /**
       * Exposed for legacy reasons
       */
      _lifecycleHooks: LIFECYCLE_HOOKS
    });
  
    /*  */
  
    var emptyObject = Object.freeze({});
  
    /**
     * Check if a string starts with $ or _
     */
    function isReserved (str) {
      var c = (str + '').charCodeAt(0);
      return c === 0x24 || c === 0x5F
    }
  
    /**
     * Define a property.
     */
    function def (obj, key, val, enumerable) {
      Object.defineProperty(obj, key, {
        value: val,
        enumerable: !!enumerable,
        writable: true,
        configurable: true
      });
    }
  
    /**
     * Parse simple path.
     */
    var bailRE = /[^\w.$]/;
    function parsePath (path) {
      if (bailRE.test(path)) {
        return
      }
      var segments = path.split('.');
      return function (obj) {
        for (var i = 0; i < segments.length; i++) {
          if (!obj) { return }
          obj = obj[segments[i]];
        }
        return obj
      }
    }
  
    /*  */
  
    var warn$1 = noop;
    var tip = noop;
    /*  */
  
    function handleError (err, vm, info) {
      if (config.errorHandler) {
        config.errorHandler.call(null, err, vm, info);
      } else {
        if ("production" !== 'production') {}
        /* istanbul ignore else */
        if (inBrowser && typeof console !== 'undefined') {
          console.error(err);
        } else {
          throw err
        }
      }
    }
  
    /*  */
    /* globals MutationObserver */
  
    // can we use __proto__?
    var hasProto = '__proto__' in {};
  
    // Browser environment sniffing
    var inBrowser = typeof window !== 'undefined';
    var UA = inBrowser && window.navigator.userAgent.toLowerCase();
    var isIE = UA && /msie|trident/.test(UA);
    var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
    var isEdge = UA && UA.indexOf('edge/') > 0;
    var isAndroid = UA && UA.indexOf('android') > 0;
    var isIOS = UA && /iphone|ipad|ipod|ios/.test(UA);
    var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
  
    var supportsPassive = false;
    if (inBrowser) {
      try {
        var opts = {};
        Object.defineProperty(opts, 'passive', ({
          get: function get () {
            /* istanbul ignore next */
            supportsPassive = true;
          }
        } )); // https://github.com/facebook/flow/issues/285
        window.addEventListener('test-passive', null, opts);
      } catch (e) {}
    }
  
    // this needs to be lazy-evaled because vue may be required before
    // vue-server-renderer can set VUE_ENV
    var _isServer;
    var isServerRendering = function () {
      if (_isServer === undefined) {
        /* istanbul ignore if */
        if (!inBrowser && typeof global !== 'undefined') {
          // detect presence of vue-server-renderer and avoid
          // Webpack shimming the process
          _isServer = global['process'].env.VUE_ENV === 'server';
        } else {
          _isServer = false;
        }
      }
      return _isServer
    };
  
    // detect devtools
    var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;
  
    /* istanbul ignore next */
    function isNative (Ctor) {
      return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
    }
  
    var hasSymbol =
      typeof Symbol !== 'undefined' && isNative(Symbol) &&
      typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);
  
    /**
     * Defer a task to execute it asynchronously.
     */
    var nextTick = (function () {
      var callbacks = [];
      var pending = false;
      var timerFunc;
  
      function nextTickHandler () {
        pending = false;
        var copies = callbacks.slice(0);
        callbacks.length = 0;
        for (var i = 0; i < copies.length; i++) {
          copies[i]();
        }
      }
  
      // the nextTick behavior leverages the microtask queue, which can be accessed
      // via either native Promise.then or MutationObserver.
      // MutationObserver has wider support, however it is seriously bugged in
      // UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
      // completely stops working after triggering a few times... so, if native
      // Promise is available, we will use it:
      /* istanbul ignore if */
      if (typeof Promise !== 'undefined' && isNative(Promise)) {
        var p = Promise.resolve();
        var logError = function (err) { console.error(err); };
        timerFunc = function () {
          p.then(nextTickHandler).catch(logError);
          // in problematic UIWebViews, Promise.then doesn't completely break, but
          // it can get stuck in a weird state where callbacks are pushed into the
          // microtask queue but the queue isn't being flushed, until the browser
          // needs to do some other work, e.g. handle a timer. Therefore we can
          // "force" the microtask queue to be flushed by adding an empty timer.
          if (isIOS) { setTimeout(noop); }
        };
      } else if (typeof MutationObserver !== 'undefined' && (
        isNative(MutationObserver) ||
        // PhantomJS and iOS 7.x
        MutationObserver.toString() === '[object MutationObserverConstructor]'
      )) {
        // use MutationObserver where native Promise is not available,
        // e.g. PhantomJS IE11, iOS7, Android 4.4
        var counter = 1;
        var observer = new MutationObserver(nextTickHandler);
        var textNode = document.createTextNode(String(counter));
        observer.observe(textNode, {
          characterData: true
        });
        timerFunc = function () {
          counter = (counter + 1) % 2;
          textNode.data = String(counter);
        };
      } else {
        // fallback to setTimeout
        /* istanbul ignore next */
        timerFunc = function () {
          setTimeout(nextTickHandler, 0);
        };
      }
  
      return function queueNextTick (cb, ctx) {
        var _resolve;
        callbacks.push(function () {
          if (cb) {
            try {
              cb.call(ctx);
            } catch (e) {
              handleError(e, ctx, 'nextTick');
            }
          } else if (_resolve) {
            _resolve(ctx);
          }
        });
        if (!pending) {
          pending = true;
          timerFunc();
        }
        if (!cb && typeof Promise !== 'undefined') {
          return new Promise(function (resolve, reject) {
            _resolve = resolve;
          })
        }
      }
    })();
  
    var _Set;
    /* istanbul ignore if */
    if (typeof Set !== 'undefined' && isNative(Set)) {
      // use native Set when available.
      _Set = Set;
    } else {
      // a non-standard Set polyfill that only works with primitive keys.
      _Set = (function () {
        function Set () {
          this.set = Object.create(null);
        }
        Set.prototype.has = function has (key) {
          return this.set[key] === true
        };
        Set.prototype.add = function add (key) {
          this.set[key] = true;
        };
        Set.prototype.clear = function clear () {
          this.set = Object.create(null);
        };
  
        return Set;
      }());
    }
  
    /*  */
  
  
    var uid$1 = 0;
  
    /**
     * A dep is an observable that can have multiple
     * directives subscribing to it.
     */
    var Dep = function Dep () {
      this.id = uid$1++;
      this.subs = [];
    };
  
    Dep.prototype.addSub = function addSub (sub) {
      this.subs.push(sub);
    };
  
    Dep.prototype.removeSub = function removeSub (sub) {
      remove(this.subs, sub);
    };
  
    Dep.prototype.depend = function depend () {
      if (Dep.target) {
        Dep.target.addDep(this);
      }
    };
  
    Dep.prototype.notify = function notify () {
      // stabilize the subscriber list first
      var subs = this.subs.slice();
      for (var i = 0, l = subs.length; i < l; i++) {
        subs[i].update();
      }
    };
  
    // the current target watcher being evaluated.
    // this is globally unique because there could be only one
    // watcher being evaluated at any time.
    Dep.target = null;
    var targetStack = [];
  
    function pushTarget (_target) {
      if (Dep.target) { targetStack.push(Dep.target); }
      Dep.target = _target;
    }
  
    function popTarget () {
      Dep.target = targetStack.pop();
    }
  
    /*
     * not type checking this file because flow doesn't play well with
     * dynamically accessing methods on Array prototype
     */
  
    var arrayProto = Array.prototype;
    var arrayMethods = Object.create(arrayProto);[
      'push',
      'pop',
      'shift',
      'unshift',
      'splice',
      'sort',
      'reverse'
    ]
    .forEach(function (method) {
      // cache original method
      var original = arrayProto[method];
      def(arrayMethods, method, function mutator () {
        var arguments$1 = arguments;
  
        // avoid leaking arguments:
        // http://jsperf.com/closure-with-arguments
        var i = arguments.length;
        var args = new Array(i);
        while (i--) {
          args[i] = arguments$1[i];
        }
        var result = original.apply(this, args);
        var ob = this.__ob__;
        var inserted;
        switch (method) {
          case 'push':
            inserted = args;
            break
          case 'unshift':
            inserted = args;
            break
          case 'splice':
            inserted = args.slice(2);
            break
        }
        if (inserted) { ob.observeArray(inserted); }
        // notify change
        ob.dep.notify();
        return result
      });
    });
  
    /*  */
  
    var arrayKeys = Object.getOwnPropertyNames(arrayMethods);
  
    /**
     * By default, when a reactive property is set, the new value is
     * also converted to become reactive. However when passing down props,
     * we don't want to force conversion because the value may be a nested value
     * under a frozen data structure. Converting it would defeat the optimization.
     */
    var observerState = {
      shouldConvert: true,
      isSettingProps: false
    };
  
    /**
     * Observer class that are attached to each observed
     * object. Once attached, the observer converts target
     * object's property keys into getter/setters that
     * collect dependencies and dispatches updates.
     */
    var Observer = function Observer (value) {
      this.value = value;
      this.dep = new Dep();
      this.vmCount = 0;
      def(value, '__ob__', this);
      if (Array.isArray(value)) {
        var augment = hasProto
          ? protoAugment
          : copyAugment;
        augment(value, arrayMethods, arrayKeys);
        this.observeArray(value);
      } else {
        this.walk(value);
      }
    };
  
    /**
     * Walk through each property and convert them into
     * getter/setters. This method should only be called when
     * value type is Object.
     */
    Observer.prototype.walk = function walk (obj) {
      var keys = Object.keys(obj);
      for (var i = 0; i < keys.length; i++) {
        defineReactive$$1(obj, keys[i], obj[keys[i]]);
      }
    };
  
    /**
     * Observe a list of Array items.
     */
    Observer.prototype.observeArray = function observeArray (items) {
      for (var i = 0, l = items.length; i < l; i++) {
        observe(items[i]);
      }
    };
  
    // helpers
  
    /**
     * Augment an target Object or Array by intercepting
     * the prototype chain using __proto__
     */
    function protoAugment (target, src) {
      /* eslint-disable no-proto */
      target.__proto__ = src;
      /* eslint-enable no-proto */
    }
  
    /**
     * Augment an target Object or Array by defining
     * hidden properties.
     */
    /* istanbul ignore next */
    function copyAugment (target, src, keys) {
      for (var i = 0, l = keys.length; i < l; i++) {
        var key = keys[i];
        def(target, key, src[key]);
      }
    }
  
    /**
     * Attempt to create an observer instance for a value,
     * returns the new observer if successfully observed,
     * or the existing observer if the value already has one.
     */
    function observe (value, asRootData) {
      if (!isObject(value)) {
        return
      }
      var ob;
      if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
        ob = value.__ob__;
      } else if (
        observerState.shouldConvert &&
        !isServerRendering() &&
        (Array.isArray(value) || isPlainObject(value)) &&
        Object.isExtensible(value) &&
        !value._isVue
      ) {
        ob = new Observer(value);
      }
      if (asRootData && ob) {
        ob.vmCount++;
      }
      return ob
    }
  
    /**
     * Define a reactive property on an Object.
     */
    function defineReactive$$1 (
      obj,
      key,
      val,
      customSetter
    ) {
      var dep = new Dep();
  
      var property = Object.getOwnPropertyDescriptor(obj, key);
      if (property && property.configurable === false) {
        return
      }
  
      // cater for pre-defined getter/setters
      var getter = property && property.get;
      var setter = property && property.set;
  
      var childOb = observe(val);
      Object.defineProperty(obj, key, {
        enumerable: true,
        configurable: true,
        get: function reactiveGetter () {
          var value = getter ? getter.call(obj) : val;
          if (Dep.target) {
            dep.depend();
            if (childOb) {
              childOb.dep.depend();
            }
            if (Array.isArray(value)) {
              dependArray(value);
            }
          }
          return value
        },
        set: function reactiveSetter (newVal) {
          var value = getter ? getter.call(obj) : val;
          /* eslint-disable no-self-compare */
          if (newVal === value || (newVal !== newVal && value !== value)) {
            return
          }
          /* eslint-enable no-self-compare */
          if ("production" !== 'production' && customSetter) {}
          if (setter) {
            setter.call(obj, newVal);
          } else {
            val = newVal;
          }
          childOb = observe(newVal);
          dep.notify();
        }
      });
    }
  
    /**
     * Set a property on an object. Adds the new property and
     * triggers change notification if the property doesn't
     * already exist.
     */
    function set (target, key, val) {
      if (Array.isArray(target) && typeof key === 'number') {
        target.length = Math.max(target.length, key);
        target.splice(key, 1, val);
        return val
      }
      if (hasOwn(target, key)) {
        target[key] = val;
        return val
      }
      var ob = (target ).__ob__;
      if (target._isVue || (ob && ob.vmCount)) {
        "production" !== 'production' && warn$1(
          'Avoid adding reactive properties to a Vue instance or its root $data ' +
          'at runtime - declare it upfront in the data option.'
        );
        return val
      }
      if (!ob) {
        target[key] = val;
        return val
      }
      defineReactive$$1(ob.value, key, val);
      ob.dep.notify();
      return val
    }
  
    /**
     * Delete a property and trigger change if necessary.
     */
    function del (target, key) {
      if (Array.isArray(target) && typeof key === 'number') {
        target.splice(key, 1);
        return
      }
      var ob = (target ).__ob__;
      if (target._isVue || (ob && ob.vmCount)) {
        "production" !== 'production' && warn$1(
          'Avoid deleting properties on a Vue instance or its root $data ' +
          '- just set it to null.'
        );
        return
      }
      if (!hasOwn(target, key)) {
        return
      }
      delete target[key];
      if (!ob) {
        return
      }
      ob.dep.notify();
    }
  
    /**
     * Collect dependencies on array elements when the array is touched, since
     * we cannot intercept array element access like property getters.
     */
    function dependArray (value) {
      for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
        e = value[i];
        e && e.__ob__ && e.__ob__.dep.depend();
        if (Array.isArray(e)) {
          dependArray(e);
        }
      }
    }
  
    /*  */
  
    /**
     * Option overwriting strategies are functions that handle
     * how to merge a parent option value and a child option
     * value into the final value.
     */
    var strats = config.optionMergeStrategies;
  
    /**
     * Helper that recursively merges two data objects together.
     */
    function mergeData (to, from) {
      if (!from) { return to }
      var key, toVal, fromVal;
      var keys = Object.keys(from);
      for (var i = 0; i < keys.length; i++) {
        key = keys[i];
        toVal = to[key];
        fromVal = from[key];
        if (!hasOwn(to, key)) {
          set(to, key, fromVal);
        } else if (isPlainObject(toVal) && isPlainObject(fromVal)) {
          mergeData(toVal, fromVal);
        }
      }
      return to
    }
  
    /**
     * Data
     */
    strats.data = function (
      parentVal,
      childVal,
      vm
    ) {
      if (!vm) {
        // in a Vue.extend merge, both should be functions
        if (!childVal) {
          return parentVal
        }
        if (typeof childVal !== 'function') {
          "production" !== 'production' && warn$1(
            'The "data" option should be a function ' +
            'that returns a per-instance value in component ' +
            'definitions.',
            vm
          );
          return parentVal
        }
        if (!parentVal) {
          return childVal
        }
        // when parentVal & childVal are both present,
        // we need to return a function that returns the
        // merged result of both functions... no need to
        // check if parentVal is a function here because
        // it has to be a function to pass previous merges.
        return function mergedDataFn () {
          return mergeData(
            childVal.call(this),
            parentVal.call(this)
          )
        }
      } else if (parentVal || childVal) {
        return function mergedInstanceDataFn () {
          // instance merge
          var instanceData = typeof childVal === 'function'
            ? childVal.call(vm)
            : childVal;
          var defaultData = typeof parentVal === 'function'
            ? parentVal.call(vm)
            : undefined;
          if (instanceData) {
            return mergeData(instanceData, defaultData)
          } else {
            return defaultData
          }
        }
      }
    };
  
    /**
     * Hooks and props are merged as arrays.
     */
    function mergeHook (
      parentVal,
      childVal
    ) {
      return childVal
        ? parentVal
          ? parentVal.concat(childVal)
          : Array.isArray(childVal)
            ? childVal
            : [childVal]
        : parentVal
    }
  
    LIFECYCLE_HOOKS.forEach(function (hook) {
      strats[hook] = mergeHook;
    });
  
    /**
     * Assets
     *
     * When a vm is present (instance creation), we need to do
     * a three-way merge between constructor options, instance
     * options and parent options.
     */
    function mergeAssets (parentVal, childVal) {
      var res = Object.create(parentVal || null);
      return childVal
        ? extend(res, childVal)
        : res
    }
  
    ASSET_TYPES.forEach(function (type) {
      strats[type + 's'] = mergeAssets;
    });
  
    /**
     * Watchers.
     *
     * Watchers hashes should not overwrite one
     * another, so we merge them as arrays.
     */
    strats.watch = function (parentVal, childVal) {
      /* istanbul ignore if */
      if (!childVal) { return Object.create(parentVal || null) }
      if (!parentVal) { return childVal }
      var ret = {};
      extend(ret, parentVal);
      for (var key in childVal) {
        var parent = ret[key];
        var child = childVal[key];
        if (parent && !Array.isArray(parent)) {
          parent = [parent];
        }
        ret[key] = parent
          ? parent.concat(child)
          : [child];
      }
      return ret
    };
  
    /**
     * Other object hashes.
     */
    strats.props =
    strats.methods =
    strats.computed = function (parentVal, childVal) {
      if (!childVal) { return Object.create(parentVal || null) }
      if (!parentVal) { return childVal }
      var ret = Object.create(null);
      extend(ret, parentVal);
      extend(ret, childVal);
      return ret
    };
  
    /**
     * Default strategy.
     */
    var defaultStrat = function (parentVal, childVal) {
      return childVal === undefined
        ? parentVal
        : childVal
    };
  
    /**
     * Ensure all props option syntax are normalized into the
     * Object-based format.
     */
    function normalizeProps (options) {
      var props = options.props;
      if (!props) { return }
      var res = {};
      var i, val, name;
      if (Array.isArray(props)) {
        i = props.length;
        while (i--) {
          val = props[i];
          if (typeof val === 'string') {
            name = camelize(val);
            res[name] = { type: null };
          } else if ("production" !== 'production') {}
        }
      } else if (isPlainObject(props)) {
        for (var key in props) {
          val = props[key];
          name = camelize(key);
          res[name] = isPlainObject(val)
            ? val
            : { type: val };
        }
      }
      options.props = res;
    }
  
    /**
     * Normalize raw function directives into object format.
     */
    function normalizeDirectives (options) {
      var dirs = options.directives;
      if (dirs) {
        for (var key in dirs) {
          var def = dirs[key];
          if (typeof def === 'function') {
            dirs[key] = { bind: def, update: def };
          }
        }
      }
    }
  
    /**
     * Merge two option objects into a new one.
     * Core utility used in both instantiation and inheritance.
     */
    function mergeOptions (
      parent,
      child,
      vm
    ) {
      if ("production" !== 'production') {}
  
      if (typeof child === 'function') {
        child = child.options;
      }
  
      normalizeProps(child);
      normalizeDirectives(child);
      var extendsFrom = child.extends;
      if (extendsFrom) {
        parent = mergeOptions(parent, extendsFrom, vm);
      }
      if (child.mixins) {
        for (var i = 0, l = child.mixins.length; i < l; i++) {
          parent = mergeOptions(parent, child.mixins[i], vm);
        }
      }
      var options = {};
      var key;
      for (key in parent) {
        mergeField(key);
      }
      for (key in child) {
        if (!hasOwn(parent, key)) {
          mergeField(key);
        }
      }
      function mergeField (key) {
        var strat = strats[key] || defaultStrat;
        options[key] = strat(parent[key], child[key], vm, key);
      }
      return options
    }
  
    /**
     * Resolve an asset.
     * This function is used because child instances need access
     * to assets defined in its ancestor chain.
     */
    function resolveAsset (
      options,
      type,
      id,
      warnMissing
    ) {
      /* istanbul ignore if */
      if (typeof id !== 'string') {
        return
      }
      var assets = options[type];
      // check local registration variations first
      if (hasOwn(assets, id)) { return assets[id] }
      var camelizedId = camelize(id);
      if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
      var PascalCaseId = capitalize(camelizedId);
      if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
      // fallback to prototype chain
      var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
      if ("production" !== 'production' && warnMissing && !res) {}
      return res
    }
  
    /*  */
  
    function validateProp (
      key,
      propOptions,
      propsData,
      vm
    ) {
      var prop = propOptions[key];
      var absent = !hasOwn(propsData, key);
      var value = propsData[key];
      // handle boolean props
      if (isType(Boolean, prop.type)) {
        if (absent && !hasOwn(prop, 'default')) {
          value = false;
        } else if (!isType(String, prop.type) && (value === '' || value === hyphenate(key))) {
          value = true;
        }
      }
      // check default value
      if (value === undefined) {
        value = getPropDefaultValue(vm, prop, key);
        // since the default value is a fresh copy,
        // make sure to observe it.
        var prevShouldConvert = observerState.shouldConvert;
        observerState.shouldConvert = true;
        observe(value);
        observerState.shouldConvert = prevShouldConvert;
      }
      if ("production" !== 'production') {}
      return value
    }
  
    /**
     * Get the default value of a prop.
     */
    function getPropDefaultValue (vm, prop, key) {
      // no default, return undefined
      if (!hasOwn(prop, 'default')) {
        return undefined
      }
      var def = prop.default;
      // warn against non-factory defaults for Object & Array
      if ("production" !== 'production' && isObject(def)) {}
      // the raw prop value was also undefined from previous render,
      // return previous default value to avoid unnecessary watcher trigger
      if (vm && vm.$options.propsData &&
        vm.$options.propsData[key] === undefined &&
        vm._props[key] !== undefined
      ) {
        return vm._props[key]
      }
      // call factory function for non-Function types
      // a value is Function if its prototype is function even across different execution context
      return typeof def === 'function' && getType(prop.type) !== 'Function'
        ? def.call(vm)
        : def
    }
  
    /**
     * Use function string name to check built-in types,
     * because a simple equality check will fail when running
     * across different vms / iframes.
     */
    function getType (fn) {
      var match = fn && fn.toString().match(/^\s*function (\w+)/);
      return match ? match[1] : ''
    }
  
    function isType (type, fn) {
      if (!Array.isArray(fn)) {
        return getType(fn) === getType(type)
      }
      for (var i = 0, len = fn.length; i < len; i++) {
        if (getType(fn[i]) === getType(type)) {
          return true
        }
      }
      /* istanbul ignore next */
      return false
    }
  
    var mark;
    /*  */
  
    var VNode = function VNode (
      tag,
      data,
      children,
      text,
      elm,
      context,
      componentOptions
    ) {
      this.tag = tag;
      this.data = data;
      this.children = children;
      this.text = text;
      this.elm = elm;
      this.ns = undefined;
      this.context = context;
      this.functionalContext = undefined;
      this.key = data && data.key;
      this.componentOptions = componentOptions;
      this.componentInstance = undefined;
      this.parent = undefined;
      this.raw = false;
      this.isStatic = false;
      this.isRootInsert = true;
      this.isComment = false;
      this.isCloned = false;
      this.isOnce = false;
    };
  
    var prototypeAccessors = { child: {} };
  
    // DEPRECATED: alias for componentInstance for backwards compat.
    /* istanbul ignore next */
    prototypeAccessors.child.get = function () {
      return this.componentInstance
    };
  
    Object.defineProperties( VNode.prototype, prototypeAccessors );
  
    var createEmptyVNode = function () {
      var node = new VNode();
      node.text = '';
      node.isComment = true;
      return node
    };
  
    function createTextVNode (val) {
      return new VNode(undefined, undefined, undefined, String(val))
    }
  
    // optimized shallow clone
    // used for static nodes and slot nodes because they may be reused across
    // multiple renders, cloning them avoids errors when DOM manipulations rely
    // on their elm reference.
    function cloneVNode (vnode) {
      var cloned = new VNode(
        vnode.tag,
        vnode.data,
        vnode.children,
        vnode.text,
        vnode.elm,
        vnode.context,
        vnode.componentOptions
      );
      cloned.ns = vnode.ns;
      cloned.isStatic = vnode.isStatic;
      cloned.key = vnode.key;
      cloned.isComment = vnode.isComment;
      cloned.isCloned = true;
      return cloned
    }
  
    function cloneVNodes (vnodes) {
      var len = vnodes.length;
      var res = new Array(len);
      for (var i = 0; i < len; i++) {
        res[i] = cloneVNode(vnodes[i]);
      }
      return res
    }
  
    /*  */
  
    var normalizeEvent = cached(function (name) {
      var passive = name.charAt(0) === '&';
      name = passive ? name.slice(1) : name;
      var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
      name = once$$1 ? name.slice(1) : name;
      var capture = name.charAt(0) === '!';
      name = capture ? name.slice(1) : name;
      return {
        name: name,
        once: once$$1,
        capture: capture,
        passive: passive
      }
    });
  
    function createFnInvoker (fns) {
      function invoker () {
        var arguments$1 = arguments;
  
        var fns = invoker.fns;
        if (Array.isArray(fns)) {
          for (var i = 0; i < fns.length; i++) {
            fns[i].apply(null, arguments$1);
          }
        } else {
          // return handler return value for single handlers
          return fns.apply(null, arguments)
        }
      }
      invoker.fns = fns;
      return invoker
    }
  
    function updateListeners (
      on,
      oldOn,
      add,
      remove$$1,
      vm
    ) {
      var name, cur, old, event;
      for (name in on) {
        cur = on[name];
        old = oldOn[name];
        event = normalizeEvent(name);
        if (isUndef(cur)) {
          "production" !== 'production' && warn$1(
            "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
            vm
          );
        } else if (isUndef(old)) {
          if (isUndef(cur.fns)) {
            cur = on[name] = createFnInvoker(cur);
          }
          add(event.name, cur, event.once, event.capture, event.passive);
        } else if (cur !== old) {
          old.fns = cur;
          on[name] = old;
        }
      }
      for (name in oldOn) {
        if (isUndef(on[name])) {
          event = normalizeEvent(name);
          remove$$1(event.name, oldOn[name], event.capture);
        }
      }
    }
  
    /*  */
  
    function mergeVNodeHook (def, hookKey, hook) {
      var invoker;
      var oldHook = def[hookKey];
  
      function wrappedHook () {
        hook.apply(this, arguments);
        // important: remove merged hook to ensure it's called only once
        // and prevent memory leak
        remove(invoker.fns, wrappedHook);
      }
  
      if (isUndef(oldHook)) {
        // no existing hook
        invoker = createFnInvoker([wrappedHook]);
      } else {
        /* istanbul ignore if */
        if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
          // already a merged invoker
          invoker = oldHook;
          invoker.fns.push(wrappedHook);
        } else {
          // existing plain hook
          invoker = createFnInvoker([oldHook, wrappedHook]);
        }
      }
  
      invoker.merged = true;
      def[hookKey] = invoker;
    }
  
    /*  */
  
    function extractPropsFromVNodeData (
      data,
      Ctor,
      tag
    ) {
      // we are only extracting raw values here.
      // validation and default values are handled in the child
      // component itself.
      var propOptions = Ctor.options.props;
      if (isUndef(propOptions)) {
        return
      }
      var res = {};
      var attrs = data.attrs;
      var props = data.props;
      if (isDef(attrs) || isDef(props)) {
        for (var key in propOptions) {
          var altKey = hyphenate(key);
          if ("production" !== 'production') {}
          checkProp(res, props, key, altKey, true) ||
          checkProp(res, attrs, key, altKey, false);
        }
      }
      return res
    }
  
    function checkProp (
      res,
      hash,
      key,
      altKey,
      preserve
    ) {
      if (isDef(hash)) {
        if (hasOwn(hash, key)) {
          res[key] = hash[key];
          if (!preserve) {
            delete hash[key];
          }
          return true
        } else if (hasOwn(hash, altKey)) {
          res[key] = hash[altKey];
          if (!preserve) {
            delete hash[altKey];
          }
          return true
        }
      }
      return false
    }
  
    /*  */
  
    // The template compiler attempts to minimize the need for normalization by
    // statically analyzing the template at compile time.
    //
    // For plain HTML markup, normalization can be completely skipped because the
    // generated render function is guaranteed to return Array<VNode>. There are
    // two cases where extra normalization is needed:
  
    // 1. When the children contains components - because a functional component
    // may return an Array instead of a single root. In this case, just a simple
    // normalization is needed - if any child is an Array, we flatten the whole
    // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
    // because functional components already normalize their own children.
    function simpleNormalizeChildren (children) {
      for (var i = 0; i < children.length; i++) {
        if (Array.isArray(children[i])) {
          return Array.prototype.concat.apply([], children)
        }
      }
      return children
    }
  
    // 2. When the children contains constructs that always generated nested Arrays,
    // e.g. <template>, <slot>, v-for, or when the children is provided by user
    // with hand-written render functions / JSX. In such cases a full normalization
    // is needed to cater to all possible types of children values.
    function normalizeChildren (children) {
      return isPrimitive(children)
        ? [createTextVNode(children)]
        : Array.isArray(children)
          ? normalizeArrayChildren(children)
          : undefined
    }
  
    function isTextNode (node) {
      return isDef(node) && isDef(node.text) && isFalse(node.isComment)
    }
  
    function normalizeArrayChildren (children, nestedIndex) {
      var res = [];
      var i, c, last;
      for (i = 0; i < children.length; i++) {
        c = children[i];
        if (isUndef(c) || typeof c === 'boolean') { continue }
        last = res[res.length - 1];
        //  nested
        if (Array.isArray(c)) {
          res.push.apply(res, normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i)));
        } else if (isPrimitive(c)) {
          if (isTextNode(last)) {
            // merge adjacent text nodes
            // this is necessary for SSR hydration because text nodes are
            // essentially merged when rendered to HTML strings
            (last).text += String(c);
          } else if (c !== '') {
            // convert primitive to vnode
            res.push(createTextVNode(c));
          }
        } else {
          if (isTextNode(c) && isTextNode(last)) {
            // merge adjacent text nodes
            res[res.length - 1] = createTextVNode(last.text + c.text);
          } else {
            // default key for nested array children (likely generated by v-for)
            if (isTrue(children._isVList) &&
              isDef(c.tag) &&
              isUndef(c.key) &&
              isDef(nestedIndex)) {
              c.key = "__vlist" + nestedIndex + "_" + i + "__";
            }
            res.push(c);
          }
        }
      }
      return res
    }
  
    /*  */
  
    function ensureCtor (comp, base) {
      return isObject(comp)
        ? base.extend(comp)
        : comp
    }
  
    function resolveAsyncComponent (
      factory,
      baseCtor,
      context
    ) {
      if (isTrue(factory.error) && isDef(factory.errorComp)) {
        return factory.errorComp
      }
  
      if (isDef(factory.resolved)) {
        return factory.resolved
      }
  
      if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
        return factory.loadingComp
      }
  
      if (isDef(factory.contexts)) {
        // already pending
        factory.contexts.push(context);
      } else {
        var contexts = factory.contexts = [context];
        var sync = true;
  
        var forceRender = function () {
          for (var i = 0, l = contexts.length; i < l; i++) {
            contexts[i].$forceUpdate();
          }
        };
  
        var resolve = once(function (res) {
          // cache resolved
          factory.resolved = ensureCtor(res, baseCtor);
          // invoke callbacks only if this is not a synchronous resolve
          // (async resolves are shimmed as synchronous during SSR)
          if (!sync) {
            forceRender();
          }
        });
  
        var reject = once(function (reason) {
          "production" !== 'production' && warn$1(
            "Failed to resolve async component: " + (String(factory)) +
            (reason ? ("\nReason: " + reason) : '')
          );
          if (isDef(factory.errorComp)) {
            factory.error = true;
            forceRender();
          }
        });
  
        var res = factory(resolve, reject);
  
        if (isObject(res)) {
          if (typeof res.then === 'function') {
            // () => Promise
            if (isUndef(factory.resolved)) {
              res.then(resolve, reject);
            }
          } else if (isDef(res.component) && typeof res.component.then === 'function') {
            res.component.then(resolve, reject);
  
            if (isDef(res.error)) {
              factory.errorComp = ensureCtor(res.error, baseCtor);
            }
  
            if (isDef(res.loading)) {
              factory.loadingComp = ensureCtor(res.loading, baseCtor);
              if (res.delay === 0) {
                factory.loading = true;
              } else {
                setTimeout(function () {
                  if (isUndef(factory.resolved) && isUndef(factory.error)) {
                    factory.loading = true;
                    forceRender();
                  }
                }, res.delay || 200);
              }
            }
  
            if (isDef(res.timeout)) {
              setTimeout(function () {
                if (isUndef(factory.resolved)) {
                  reject(
                    null
                  );
                }
              }, res.timeout);
            }
          }
        }
  
        sync = false;
        // return in case resolved synchronously
        return factory.loading
          ? factory.loadingComp
          : factory.resolved
      }
    }
  
    /*  */
  
    function getFirstComponentChild (children) {
      if (Array.isArray(children)) {
        for (var i = 0; i < children.length; i++) {
          var c = children[i];
          if (isDef(c) && isDef(c.componentOptions)) {
            return c
          }
        }
      }
    }
  
    /*  */
  
    /*  */
  
    function initEvents (vm) {
      vm._events = Object.create(null);
      vm._hasHookEvent = false;
      // init parent attached events
      var listeners = vm.$options._parentListeners;
      if (listeners) {
        updateComponentListeners(vm, listeners);
      }
    }
  
    var target;
  
    function add (event, fn, once$$1) {
      if (once$$1) {
        target.$once(event, fn);
      } else {
        target.$on(event, fn);
      }
    }
  
    function remove$1 (event, fn) {
      target.$off(event, fn);
    }
  
    function updateComponentListeners (
      vm,
      listeners,
      oldListeners
    ) {
      target = vm;
      updateListeners(listeners, oldListeners || {}, add, remove$1, vm);
    }
  
    function eventsMixin (Vue) {
      var hookRE = /^hook:/;
      Vue.prototype.$on = function (event, fn) {
        var this$1 = this;
  
        var vm = this;
        if (Array.isArray(event)) {
          for (var i = 0, l = event.length; i < l; i++) {
            this$1.$on(event[i], fn);
          }
        } else {
          (vm._events[event] || (vm._events[event] = [])).push(fn);
          // optimize hook:event cost by using a boolean flag marked at registration
          // instead of a hash lookup
          if (hookRE.test(event)) {
            vm._hasHookEvent = true;
          }
        }
        return vm
      };
  
      Vue.prototype.$once = function (event, fn) {
        var vm = this;
        function on () {
          vm.$off(event, on);
          fn.apply(vm, arguments);
        }
        on.fn = fn;
        vm.$on(event, on);
        return vm
      };
  
      Vue.prototype.$off = function (event, fn) {
        var this$1 = this;
  
        var vm = this;
        // all
        if (!arguments.length) {
          vm._events = Object.create(null);
          return vm
        }
        // array of events
        if (Array.isArray(event)) {
          for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
            this$1.$off(event[i$1], fn);
          }
          return vm
        }
        // specific event
        var cbs = vm._events[event];
        if (!cbs) {
          return vm
        }
        if (arguments.length === 1) {
          vm._events[event] = null;
          return vm
        }
        // specific handler
        var cb;
        var i = cbs.length;
        while (i--) {
          cb = cbs[i];
          if (cb === fn || cb.fn === fn) {
            cbs.splice(i, 1);
            break
          }
        }
        return vm
      };
  
      Vue.prototype.$emit = function (event) {
        var vm = this;
        if ("production" !== 'production') {}
        var cbs = vm._events[event];
        if (cbs) {
          cbs = cbs.length > 1 ? toArray(cbs) : cbs;
          var args = toArray(arguments, 1);
          for (var i = 0, l = cbs.length; i < l; i++) {
            cbs[i].apply(vm, args);
          }
        }
        return vm
      };
    }
  
    /*  */
  
    /**
     * Runtime helper for resolving raw children VNodes into a slot object.
     */
    function resolveSlots (
      children,
      context
    ) {
      var slots = {};
      if (!children) {
        return slots
      }
      var defaultSlot = [];
      for (var i = 0, l = children.length; i < l; i++) {
        var child = children[i];
        // named slots should only be respected if the vnode was rendered in the
        // same context.
        if ((child.context === context || child.functionalContext === context) &&
          child.data && child.data.slot != null
        ) {
          var name = child.data.slot;
          var slot = (slots[name] || (slots[name] = []));
          if (child.tag === 'template') {
            slot.push.apply(slot, child.children);
          } else {
            slot.push(child);
          }
        } else {
          defaultSlot.push(child);
        }
      }
      // ignore whitespace
      if (!defaultSlot.every(isWhitespace)) {
        slots.default = defaultSlot;
      }
      return slots
    }
  
    function isWhitespace (node) {
      return node.isComment || node.text === ' '
    }
  
    function resolveScopedSlots (
      fns, // see flow/vnode
      res
    ) {
      res = res || {};
      for (var i = 0; i < fns.length; i++) {
        if (Array.isArray(fns[i])) {
          resolveScopedSlots(fns[i], res);
        } else {
          res[fns[i].key] = fns[i].fn;
        }
      }
      return res
    }
  
    /*  */
  
    var activeInstance = null;
  
    function initLifecycle (vm) {
      var options = vm.$options;
  
      // locate first non-abstract parent
      var parent = options.parent;
      if (parent && !options.abstract) {
        while (parent.$options.abstract && parent.$parent) {
          parent = parent.$parent;
        }
        parent.$children.push(vm);
      }
  
      vm.$parent = parent;
      vm.$root = parent ? parent.$root : vm;
  
      vm.$children = [];
      vm.$refs = {};
  
      vm._watcher = null;
      vm._inactive = null;
      vm._directInactive = false;
      vm._isMounted = false;
      vm._isDestroyed = false;
      vm._isBeingDestroyed = false;
    }
  
    function lifecycleMixin (Vue) {
      Vue.prototype._update = function (vnode, hydrating) {
        var vm = this;
        if (vm._isMounted) {
          callHook(vm, 'beforeUpdate');
        }
        var prevEl = vm.$el;
        var prevVnode = vm._vnode;
        var prevActiveInstance = activeInstance;
        activeInstance = vm;
        vm._vnode = vnode;
        // Vue.prototype.__patch__ is injected in entry points
        // based on the rendering backend used.
        if (!prevVnode) {
          // initial render
          vm.$el = vm.__patch__(
            vm.$el, vnode, hydrating, false /* removeOnly */,
            vm.$options._parentElm,
            vm.$options._refElm
          );
        } else {
          // updates
          vm.$el = vm.__patch__(prevVnode, vnode);
        }
        activeInstance = prevActiveInstance;
        // update __vue__ reference
        if (prevEl) {
          prevEl.__vue__ = null;
        }
        if (vm.$el) {
          vm.$el.__vue__ = vm;
        }
        // if parent is an HOC, update its $el as well
        if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
          vm.$parent.$el = vm.$el;
        }
        // updated hook is called by the scheduler to ensure that children are
        // updated in a parent's updated hook.
      };
  
      Vue.prototype.$forceUpdate = function () {
        var vm = this;
        if (vm._watcher) {
          vm._watcher.update();
        }
      };
  
      Vue.prototype.$destroy = function () {
        var vm = this;
        if (vm._isBeingDestroyed) {
          return
        }
        callHook(vm, 'beforeDestroy');
        vm._isBeingDestroyed = true;
        // remove self from parent
        var parent = vm.$parent;
        if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
          remove(parent.$children, vm);
        }
        // teardown watchers
        if (vm._watcher) {
          vm._watcher.teardown();
        }
        var i = vm._watchers.length;
        while (i--) {
          vm._watchers[i].teardown();
        }
        // remove reference from data ob
        // frozen object may not have observer.
        if (vm._data.__ob__) {
          vm._data.__ob__.vmCount--;
        }
        // call the last hook...
        vm._isDestroyed = true;
        // invoke destroy hooks on current rendered tree
        vm.__patch__(vm._vnode, null);
        // fire destroyed hook
        callHook(vm, 'destroyed');
        // turn off all instance listeners.
        vm.$off();
        // remove __vue__ reference
        if (vm.$el) {
          vm.$el.__vue__ = null;
        }
        // remove reference to DOM nodes (prevents leak)
        vm.$options._parentElm = vm.$options._refElm = null;
      };
    }
  
    function mountComponent (
      vm,
      el,
      hydrating
    ) {
      vm.$el = el;
      if (!vm.$options.render) {
        vm.$options.render = createEmptyVNode;
        if ("production" !== 'production') {}
      }
      callHook(vm, 'beforeMount');
  
      var updateComponent;
      /* istanbul ignore if */
      if ("production" !== 'production' && config.performance && mark) {} else {
        updateComponent = function () {
          vm._update(vm._render(), hydrating);
        };
      }
  
      vm._watcher = new Watcher(vm, updateComponent, noop);
      hydrating = false;
  
      // manually mounted instance, call mounted on self
      // mounted is called for render-created child components in its inserted hook
      if (vm.$vnode == null) {
        vm._isMounted = true;
        callHook(vm, 'mounted');
      }
      return vm
    }
  
    function updateChildComponent (
      vm,
      propsData,
      listeners,
      parentVnode,
      renderChildren
    ) {
      // determine whether component has slot children
      // we need to do this before overwriting $options._renderChildren
      var hasChildren = !!(
        renderChildren ||               // has new static slots
        vm.$options._renderChildren ||  // has old static slots
        parentVnode.data.scopedSlots || // has new scoped slots
        vm.$scopedSlots !== emptyObject // has old scoped slots
      );
  
      vm.$options._parentVnode = parentVnode;
      vm.$vnode = parentVnode; // update vm's placeholder node without re-render
      if (vm._vnode) { // update child tree's parent
        vm._vnode.parent = parentVnode;
      }
      vm.$options._renderChildren = renderChildren;
  
      // update props
      if (propsData && vm.$options.props) {
        observerState.shouldConvert = false;
        if ("production" !== 'production') {}
        var props = vm._props;
        var propKeys = vm.$options._propKeys || [];
        for (var i = 0; i < propKeys.length; i++) {
          var key = propKeys[i];
          props[key] = validateProp(key, vm.$options.props, propsData, vm);
        }
        observerState.shouldConvert = true;
        if ("production" !== 'production') {}
        // keep a copy of raw propsData
        vm.$options.propsData = propsData;
      }
      // update listeners
      if (listeners) {
        var oldListeners = vm.$options._parentListeners;
        vm.$options._parentListeners = listeners;
        updateComponentListeners(vm, listeners, oldListeners);
      }
      // resolve slots + force update if has children
      if (hasChildren) {
        vm.$slots = resolveSlots(renderChildren, parentVnode.context);
        vm.$forceUpdate();
      }
    }
  
    function isInInactiveTree (vm) {
      while (vm && (vm = vm.$parent)) {
        if (vm._inactive) { return true }
      }
      return false
    }
  
    function activateChildComponent (vm, direct) {
      if (direct) {
        vm._directInactive = false;
        if (isInInactiveTree(vm)) {
          return
        }
      } else if (vm._directInactive) {
        return
      }
      if (vm._inactive || vm._inactive === null) {
        vm._inactive = false;
        for (var i = 0; i < vm.$children.length; i++) {
          activateChildComponent(vm.$children[i]);
        }
        callHook(vm, 'activated');
      }
    }
  
    function deactivateChildComponent (vm, direct) {
      if (direct) {
        vm._directInactive = true;
        if (isInInactiveTree(vm)) {
          return
        }
      }
      if (!vm._inactive) {
        vm._inactive = true;
        for (var i = 0; i < vm.$children.length; i++) {
          deactivateChildComponent(vm.$children[i]);
        }
        callHook(vm, 'deactivated');
      }
    }
  
    function callHook (vm, hook) {
      var handlers = vm.$options[hook];
      if (handlers) {
        for (var i = 0, j = handlers.length; i < j; i++) {
          try {
            handlers[i].call(vm);
          } catch (e) {
            handleError(e, vm, (hook + " hook"));
          }
        }
      }
      if (vm._hasHookEvent) {
        vm.$emit('hook:' + hook);
      }
    }
  
    var queue = [];
    var activatedChildren = [];
    var has = {};
    var waiting = false;
    var flushing = false;
    var index = 0;
  
    /**
     * Reset the scheduler's state.
     */
    function resetSchedulerState () {
      index = queue.length = activatedChildren.length = 0;
      has = {};
      if ("production" !== 'production') {}
      waiting = flushing = false;
    }
  
    /**
     * Flush both queues and run the watchers.
     */
    function flushSchedulerQueue () {
      flushing = true;
      var watcher, id;
  
      // Sort queue before flush.
      // This ensures that:
      // 1. Components are updated from parent to child. (because parent is always
      //    created before the child)
      // 2. A component's user watchers are run before its render watcher (because
      //    user watchers are created before the render watcher)
      // 3. If a component is destroyed during a parent component's watcher run,
      //    its watchers can be skipped.
      queue.sort(function (a, b) { return a.id - b.id; });
  
      // do not cache length because more watchers might be pushed
      // as we run existing watchers
      for (index = 0; index < queue.length; index++) {
        watcher = queue[index];
        id = watcher.id;
        has[id] = null;
        watcher.run();
        // in dev build, check and stop circular updates.
        if ("production" !== 'production' && has[id] != null) {}
      }
  
      // keep copies of post queues before resetting state
      var activatedQueue = activatedChildren.slice();
      var updatedQueue = queue.slice();
  
      resetSchedulerState();
  
      // call component updated and activated hooks
      callActivatedHooks(activatedQueue);
      callUpdateHooks(updatedQueue);
  
      // devtool hook
      /* istanbul ignore if */
      if (devtools && config.devtools) {
        devtools.emit('flush');
      }
    }
  
    function callUpdateHooks (queue) {
      var i = queue.length;
      while (i--) {
        var watcher = queue[i];
        var vm = watcher.vm;
        if (vm._watcher === watcher && vm._isMounted) {
          callHook(vm, 'updated');
        }
      }
    }
  
    /**
     * Queue a kept-alive component that was activated during patch.
     * The queue will be processed after the entire tree has been patched.
     */
    function queueActivatedComponent (vm) {
      // setting _inactive to false here so that a render function can
      // rely on checking whether it's in an inactive tree (e.g. router-view)
      vm._inactive = false;
      activatedChildren.push(vm);
    }
  
    function callActivatedHooks (queue) {
      for (var i = 0; i < queue.length; i++) {
        queue[i]._inactive = true;
        activateChildComponent(queue[i], true /* true */);
      }
    }
  
    /**
     * Push a watcher into the watcher queue.
     * Jobs with duplicate IDs will be skipped unless it's
     * pushed when the queue is being flushed.
     */
    function queueWatcher (watcher) {
      var id = watcher.id;
      if (has[id] == null) {
        has[id] = true;
        if (!flushing) {
          queue.push(watcher);
        } else {
          // if already flushing, splice the watcher based on its id
          // if already past its id, it will be run next immediately.
          var i = queue.length - 1;
          while (i > index && queue[i].id > watcher.id) {
            i--;
          }
          queue.splice(i + 1, 0, watcher);
        }
        // queue the flush
        if (!waiting) {
          waiting = true;
          nextTick(flushSchedulerQueue);
        }
      }
    }
  
    /*  */
  
    var uid$2 = 0;
  
    /**
     * A watcher parses an expression, collects dependencies,
     * and fires callback when the expression value changes.
     * This is used for both the $watch() api and directives.
     */
    var Watcher = function Watcher (
      vm,
      expOrFn,
      cb,
      options
    ) {
      this.vm = vm;
      vm._watchers.push(this);
      // options
      if (options) {
        this.deep = !!options.deep;
        this.user = !!options.user;
        this.lazy = !!options.lazy;
        this.sync = !!options.sync;
      } else {
        this.deep = this.user = this.lazy = this.sync = false;
      }
      this.cb = cb;
      this.id = ++uid$2; // uid for batching
      this.active = true;
      this.dirty = this.lazy; // for lazy watchers
      this.deps = [];
      this.newDeps = [];
      this.depIds = new _Set();
      this.newDepIds = new _Set();
      this.expression = '';
      // parse expression for getter
      if (typeof expOrFn === 'function') {
        this.getter = expOrFn;
      } else {
        this.getter = parsePath(expOrFn);
        if (!this.getter) {
          this.getter = function () {};
          "production" !== 'production' && warn$1(
            "Failed watching path: \"" + expOrFn + "\" " +
            'Watcher only accepts simple dot-delimited paths. ' +
            'For full control, use a function instead.',
            vm
          );
        }
      }
      this.value = this.lazy
        ? undefined
        : this.get();
    };
  
    /**
     * Evaluate the getter, and re-collect dependencies.
     */
    Watcher.prototype.get = function get () {
      pushTarget(this);
      var value;
      var vm = this.vm;
      if (this.user) {
        try {
          value = this.getter.call(vm, vm);
        } catch (e) {
          handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
        }
      } else {
        value = this.getter.call(vm, vm);
      }
      // "touch" every property so they are all tracked as
      // dependencies for deep watching
      if (this.deep) {
        traverse(value);
      }
      popTarget();
      this.cleanupDeps();
      return value
    };
  
    /**
     * Add a dependency to this directive.
     */
    Watcher.prototype.addDep = function addDep (dep) {
      var id = dep.id;
      if (!this.newDepIds.has(id)) {
        this.newDepIds.add(id);
        this.newDeps.push(dep);
        if (!this.depIds.has(id)) {
          dep.addSub(this);
        }
      }
    };
  
    /**
     * Clean up for dependency collection.
     */
    Watcher.prototype.cleanupDeps = function cleanupDeps () {
        var this$1 = this;
  
      var i = this.deps.length;
      while (i--) {
        var dep = this$1.deps[i];
        if (!this$1.newDepIds.has(dep.id)) {
          dep.removeSub(this$1);
        }
      }
      var tmp = this.depIds;
      this.depIds = this.newDepIds;
      this.newDepIds = tmp;
      this.newDepIds.clear();
      tmp = this.deps;
      this.deps = this.newDeps;
      this.newDeps = tmp;
      this.newDeps.length = 0;
    };
  
    /**
     * Subscriber interface.
     * Will be called when a dependency changes.
     */
    Watcher.prototype.update = function update () {
      /* istanbul ignore else */
      if (this.lazy) {
        this.dirty = true;
      } else if (this.sync) {
        this.run();
      } else {
        queueWatcher(this);
      }
    };
  
    /**
     * Scheduler job interface.
     * Will be called by the scheduler.
     */
    Watcher.prototype.run = function run () {
      if (this.active) {
        var value = this.get();
        if (
          value !== this.value ||
          // Deep watchers and watchers on Object/Arrays should fire even
          // when the value is the same, because the value may
          // have mutated.
          isObject(value) ||
          this.deep
        ) {
          // set new value
          var oldValue = this.value;
          this.value = value;
          if (this.user) {
            try {
              this.cb.call(this.vm, value, oldValue);
            } catch (e) {
              handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
            }
          } else {
            this.cb.call(this.vm, value, oldValue);
          }
        }
      }
    };
  
    /**
     * Evaluate the value of the watcher.
     * This only gets called for lazy watchers.
     */
    Watcher.prototype.evaluate = function evaluate () {
      this.value = this.get();
      this.dirty = false;
    };
  
    /**
     * Depend on all deps collected by this watcher.
     */
    Watcher.prototype.depend = function depend () {
        var this$1 = this;
  
      var i = this.deps.length;
      while (i--) {
        this$1.deps[i].depend();
      }
    };
  
    /**
     * Remove self from all dependencies' subscriber list.
     */
    Watcher.prototype.teardown = function teardown () {
        var this$1 = this;
  
      if (this.active) {
        // remove self from vm's watcher list
        // this is a somewhat expensive operation so we skip it
        // if the vm is being destroyed.
        if (!this.vm._isBeingDestroyed) {
          remove(this.vm._watchers, this);
        }
        var i = this.deps.length;
        while (i--) {
          this$1.deps[i].removeSub(this$1);
        }
        this.active = false;
      }
    };
  
    /**
     * Recursively traverse an object to evoke all converted
     * getters, so that every nested property inside the object
     * is collected as a "deep" dependency.
     */
    var seenObjects = new _Set();
    function traverse (val) {
      seenObjects.clear();
      _traverse(val, seenObjects);
    }
  
    function _traverse (val, seen) {
      var i, keys;
      var isA = Array.isArray(val);
      if ((!isA && !isObject(val)) || !Object.isExtensible(val)) {
        return
      }
      if (val.__ob__) {
        var depId = val.__ob__.dep.id;
        if (seen.has(depId)) {
          return
        }
        seen.add(depId);
      }
      if (isA) {
        i = val.length;
        while (i--) { _traverse(val[i], seen); }
      } else {
        keys = Object.keys(val);
        i = keys.length;
        while (i--) { _traverse(val[keys[i]], seen); }
      }
    }
  
    /*  */
  
    var sharedPropertyDefinition = {
      enumerable: true,
      configurable: true,
      get: noop,
      set: noop
    };
  
    function proxy (target, sourceKey, key) {
      sharedPropertyDefinition.get = function proxyGetter () {
        return this[sourceKey][key]
      };
      sharedPropertyDefinition.set = function proxySetter (val) {
        this[sourceKey][key] = val;
      };
      Object.defineProperty(target, key, sharedPropertyDefinition);
    }
  
    function initState (vm) {
      vm._watchers = [];
      var opts = vm.$options;
      if (opts.props) { initProps(vm, opts.props); }
      if (opts.methods) { initMethods(vm, opts.methods); }
      if (opts.data) {
        initData(vm);
      } else {
        observe(vm._data = {}, true /* asRootData */);
      }
      if (opts.computed) { initComputed(vm, opts.computed); }
      if (opts.watch) { initWatch(vm, opts.watch); }
    }
  
    function initProps (vm, propsOptions) {
      var propsData = vm.$options.propsData || {};
      var props = vm._props = {};
      // cache prop keys so that future props updates can iterate using Array
      // instead of dynamic object key enumeration.
      var keys = vm.$options._propKeys = [];
      var isRoot = !vm.$parent;
      // root instance props should be converted
      observerState.shouldConvert = isRoot;
      var loop = function ( key ) {
        keys.push(key);
        var value = validateProp(key, propsOptions, propsData, vm);
        /* istanbul ignore else */
        if ("production" !== 'production') {} else {
          defineReactive$$1(props, key, value);
        }
        // static props are already proxied on the component's prototype
        // during Vue.extend(). We only need to proxy props defined at
        // instantiation here.
        if (!(key in vm)) {
          proxy(vm, "_props", key);
        }
      };
  
      for (var key in propsOptions) { loop( key ); }
      observerState.shouldConvert = true;
    }
  
    function initData (vm) {
      var data = vm.$options.data;
      data = vm._data = typeof data === 'function'
        ? getData(data, vm)
        : data || {};
      if (!isPlainObject(data)) {
        data = {};
        "production" !== 'production' && warn$1(
          'data functions should return an object:\n' +
          'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
          vm
        );
      }
      // proxy data on instance
      var keys = Object.keys(data);
      var props = vm.$options.props;
      var i = keys.length;
      while (i--) {
        if (props && hasOwn(props, keys[i])) {
          "production" !== 'production' && warn$1(
            "The data property \"" + (keys[i]) + "\" is already declared as a prop. " +
            "Use prop default value instead.",
            vm
          );
        } else if (!isReserved(keys[i])) {
          proxy(vm, "_data", keys[i]);
        }
      }
      // observe data
      observe(data, true /* asRootData */);
    }
  
    function getData (data, vm) {
      try {
        return data.call(vm)
      } catch (e) {
        handleError(e, vm, "data()");
        return {}
      }
    }
  
    var computedWatcherOptions = { lazy: true };
  
    function initComputed (vm, computed) {
      var watchers = vm._computedWatchers = Object.create(null);
  
      for (var key in computed) {
        var userDef = computed[key];
        var getter = typeof userDef === 'function' ? userDef : userDef.get;
        if ("production" !== 'production') {}
        // create internal watcher for the computed property.
        watchers[key] = new Watcher(vm, getter, noop, computedWatcherOptions);
  
        // component-defined computed properties are already defined on the
        // component prototype. We only need to define computed properties defined
        // at instantiation here.
        if (!(key in vm)) {
          defineComputed(vm, key, userDef);
        } else if ("production" !== 'production') {}
      }
    }
  
    function defineComputed (target, key, userDef) {
      if (typeof userDef === 'function') {
        sharedPropertyDefinition.get = createComputedGetter(key);
        sharedPropertyDefinition.set = noop;
      } else {
        sharedPropertyDefinition.get = userDef.get
          ? userDef.cache !== false
            ? createComputedGetter(key)
            : userDef.get
          : noop;
        sharedPropertyDefinition.set = userDef.set
          ? userDef.set
          : noop;
      }
      Object.defineProperty(target, key, sharedPropertyDefinition);
    }
  
    function createComputedGetter (key) {
      return function computedGetter () {
        var watcher = this._computedWatchers && this._computedWatchers[key];
        if (watcher) {
          if (watcher.dirty) {
            watcher.evaluate();
          }
          if (Dep.target) {
            watcher.depend();
          }
          return watcher.value
        }
      }
    }
  
    function initMethods (vm, methods) {
      var props = vm.$options.props;
      for (var key in methods) {
        vm[key] = methods[key] == null ? noop : bind(methods[key], vm);
        if ("production" !== 'production') {}
      }
    }
  
    function initWatch (vm, watch) {
      for (var key in watch) {
        var handler = watch[key];
        if (Array.isArray(handler)) {
          for (var i = 0; i < handler.length; i++) {
            createWatcher(vm, key, handler[i]);
          }
        } else {
          createWatcher(vm, key, handler);
        }
      }
    }
  
    function createWatcher (vm, key, handler) {
      var options;
      if (isPlainObject(handler)) {
        options = handler;
        handler = handler.handler;
      }
      if (typeof handler === 'string') {
        handler = vm[handler];
      }
      vm.$watch(key, handler, options);
    }
  
    function stateMixin (Vue) {
      // flow somehow has problems with directly declared definition object
      // when using Object.defineProperty, so we have to procedurally build up
      // the object here.
      var dataDef = {};
      dataDef.get = function () { return this._data };
      var propsDef = {};
      propsDef.get = function () { return this._props };
      if ("production" !== 'production') {}
      Object.defineProperty(Vue.prototype, '$data', dataDef);
      Object.defineProperty(Vue.prototype, '$props', propsDef);
  
      Vue.prototype.$set = set;
      Vue.prototype.$delete = del;
  
      Vue.prototype.$watch = function (
        expOrFn,
        cb,
        options
      ) {
        var vm = this;
        options = options || {};
        options.user = true;
        var watcher = new Watcher(vm, expOrFn, cb, options);
        if (options.immediate) {
          cb.call(vm, watcher.value);
        }
        return function unwatchFn () {
          watcher.teardown();
        }
      };
    }
  
    /*  */
  
    function initProvide (vm) {
      var provide = vm.$options.provide;
      if (provide) {
        vm._provided = typeof provide === 'function'
          ? provide.call(vm)
          : provide;
      }
    }
  
    function initInjections (vm) {
      var result = resolveInject(vm.$options.inject, vm);
      if (result) {
        Object.keys(result).forEach(function (key) {
          /* istanbul ignore else */
          if ("production" !== 'production') {} else {
            defineReactive$$1(vm, key, result[key]);
          }
        });
      }
    }
  
    function resolveInject (inject, vm) {
      if (inject) {
        // inject is :any because flow is not smart enough to figure out cached
        // isArray here
        var isArray = Array.isArray(inject);
        var result = Object.create(null);
        var keys = isArray
          ? inject
          : hasSymbol
            ? Reflect.ownKeys(inject)
            : Object.keys(inject);
  
        for (var i = 0; i < keys.length; i++) {
          var key = keys[i];
          var provideKey = isArray ? key : inject[key];
          var source = vm;
          while (source) {
            if (source._provided && provideKey in source._provided) {
              result[key] = source._provided[provideKey];
              break
            }
            source = source.$parent;
          }
        }
        return result
      }
    }
  
    /*  */
  
    function createFunctionalComponent (
      Ctor,
      propsData,
      data,
      context,
      children
    ) {
      var props = {};
      var propOptions = Ctor.options.props;
      if (isDef(propOptions)) {
        for (var key in propOptions) {
          props[key] = validateProp(key, propOptions, propsData || {});
        }
      } else {
        if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
        if (isDef(data.props)) { mergeProps(props, data.props); }
      }
      // ensure the createElement function in functional components
      // gets a unique context - this is necessary for correct named slot check
      var _context = Object.create(context);
      var h = function (a, b, c, d) { return createElement(_context, a, b, c, d, true); };
      var vnode = Ctor.options.render.call(null, h, {
        data: data,
        props: props,
        children: children,
        parent: context,
        listeners: data.on || {},
        injections: resolveInject(Ctor.options.inject, context),
        slots: function () { return resolveSlots(children, context); }
      });
      if (vnode instanceof VNode) {
        vnode.functionalContext = context;
        vnode.functionalOptions = Ctor.options;
        if (data.slot) {
          (vnode.data || (vnode.data = {})).slot = data.slot;
        }
      }
      return vnode
    }
  
    function mergeProps (to, from) {
      for (var key in from) {
        to[camelize(key)] = from[key];
      }
    }
  
    /*  */
  
    // hooks to be invoked on component VNodes during patch
    var componentVNodeHooks = {
      init: function init (
        vnode,
        hydrating,
        parentElm,
        refElm
      ) {
        if (!vnode.componentInstance || vnode.componentInstance._isDestroyed) {
          var child = vnode.componentInstance = createComponentInstanceForVnode(
            vnode,
            activeInstance,
            parentElm,
            refElm
          );
          child.$mount(hydrating ? vnode.elm : undefined, hydrating);
        } else if (vnode.data.keepAlive) {
          // kept-alive components, treat as a patch
          var mountedNode = vnode; // work around flow
          componentVNodeHooks.prepatch(mountedNode, mountedNode);
        }
      },
  
      prepatch: function prepatch (oldVnode, vnode) {
        var options = vnode.componentOptions;
        var child = vnode.componentInstance = oldVnode.componentInstance;
        updateChildComponent(
          child,
          options.propsData, // updated props
          options.listeners, // updated listeners
          vnode, // new parent vnode
          options.children // new children
        );
      },
  
      insert: function insert (vnode) {
        var context = vnode.context;
        var componentInstance = vnode.componentInstance;
        if (!componentInstance._isMounted) {
          componentInstance._isMounted = true;
          callHook(componentInstance, 'mounted');
        }
        if (vnode.data.keepAlive) {
          if (context._isMounted) {
            // vue-router#1212
            // During updates, a kept-alive component's child components may
            // change, so directly walking the tree here may call activated hooks
            // on incorrect children. Instead we push them into a queue which will
            // be processed after the whole patch process ended.
            queueActivatedComponent(componentInstance);
          } else {
            activateChildComponent(componentInstance, true /* direct */);
          }
        }
      },
  
      destroy: function destroy (vnode) {
        var componentInstance = vnode.componentInstance;
        if (!componentInstance._isDestroyed) {
          if (!vnode.data.keepAlive) {
            componentInstance.$destroy();
          } else {
            deactivateChildComponent(componentInstance, true /* direct */);
          }
        }
      }
    };
  
    var hooksToMerge = Object.keys(componentVNodeHooks);
  
    function createComponent (
      Ctor,
      data,
      context,
      children,
      tag
    ) {
      if (isUndef(Ctor)) {
        return
      }
  
      var baseCtor = context.$options._base;
  
      // plain options object: turn it into a constructor
      if (isObject(Ctor)) {
        Ctor = baseCtor.extend(Ctor);
      }
  
      // if at this stage it's not a constructor or an async component factory,
      // reject.
      if (typeof Ctor !== 'function') {
        if ("production" !== 'production') {}
        return
      }
  
      // async component
      if (isUndef(Ctor.cid)) {
        Ctor = resolveAsyncComponent(Ctor, baseCtor, context);
        if (Ctor === undefined) {
          // return nothing if this is indeed an async component
          // wait for the callback to trigger parent update.
          return
        }
      }
  
      // resolve constructor options in case global mixins are applied after
      // component constructor creation
      resolveConstructorOptions(Ctor);
  
      data = data || {};
  
      // transform component v-model data into props & events
      if (isDef(data.model)) {
        transformModel(Ctor.options, data);
      }
  
      // extract props
      var propsData = extractPropsFromVNodeData(data, Ctor, tag);
  
      // functional component
      if (isTrue(Ctor.options.functional)) {
        return createFunctionalComponent(Ctor, propsData, data, context, children)
      }
  
      // extract listeners, since these needs to be treated as
      // child component listeners instead of DOM listeners
      var listeners = data.on;
      // replace with listeners with .native modifier
      data.on = data.nativeOn;
  
      if (isTrue(Ctor.options.abstract)) {
        // abstract components do not keep anything
        // other than props & listeners
        data = {};
      }
  
      // merge component management hooks onto the placeholder node
      mergeHooks(data);
  
      // return a placeholder vnode
      var name = Ctor.options.name || tag;
      var vnode = new VNode(
        ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
        data, undefined, undefined, undefined, context,
        { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children }
      );
      return vnode
    }
  
    function createComponentInstanceForVnode (
      vnode, // we know it's MountedComponentVNode but flow doesn't
      parent, // activeInstance in lifecycle state
      parentElm,
      refElm
    ) {
      var vnodeComponentOptions = vnode.componentOptions;
      var options = {
        _isComponent: true,
        parent: parent,
        propsData: vnodeComponentOptions.propsData,
        _componentTag: vnodeComponentOptions.tag,
        _parentVnode: vnode,
        _parentListeners: vnodeComponentOptions.listeners,
        _renderChildren: vnodeComponentOptions.children,
        _parentElm: parentElm || null,
        _refElm: refElm || null
      };
      // check inline-template render functions
      var inlineTemplate = vnode.data.inlineTemplate;
      if (isDef(inlineTemplate)) {
        options.render = inlineTemplate.render;
        options.staticRenderFns = inlineTemplate.staticRenderFns;
      }
      return new vnodeComponentOptions.Ctor(options)
    }
  
    function mergeHooks (data) {
      if (!data.hook) {
        data.hook = {};
      }
      for (var i = 0; i < hooksToMerge.length; i++) {
        var key = hooksToMerge[i];
        var fromParent = data.hook[key];
        var ours = componentVNodeHooks[key];
        data.hook[key] = fromParent ? mergeHook$1(ours, fromParent) : ours;
      }
    }
  
    function mergeHook$1 (one, two) {
      return function (a, b, c, d) {
        one(a, b, c, d);
        two(a, b, c, d);
      }
    }
  
    // transform component v-model info (value and callback) into
    // prop and event handler respectively.
    function transformModel (options, data) {
      var prop = (options.model && options.model.prop) || 'value';
      var event = (options.model && options.model.event) || 'input';(data.props || (data.props = {}))[prop] = data.model.value;
      var on = data.on || (data.on = {});
      if (isDef(on[event])) {
        on[event] = [data.model.callback].concat(on[event]);
      } else {
        on[event] = data.model.callback;
      }
    }
  
    /*  */
  
    var SIMPLE_NORMALIZE = 1;
    var ALWAYS_NORMALIZE = 2;
  
    // wrapper function for providing a more flexible interface
    // without getting yelled at by flow
    function createElement (
      context,
      tag,
      data,
      children,
      normalizationType,
      alwaysNormalize
    ) {
      if (Array.isArray(data) || isPrimitive(data)) {
        normalizationType = children;
        children = data;
        data = undefined;
      }
      if (isTrue(alwaysNormalize)) {
        normalizationType = ALWAYS_NORMALIZE;
      }
      return _createElement(context, tag, data, children, normalizationType)
    }
  
    function _createElement (
      context,
      tag,
      data,
      children,
      normalizationType
    ) {
      if (isDef(data) && isDef((data).__ob__)) {
        "production" !== 'production' && warn$1(
          "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
          'Always create fresh vnode data objects in each render!',
          context
        );
        return createEmptyVNode()
      }
      if (!tag) {
        // in case of component :is set to falsy value
        return createEmptyVNode()
      }
      // support single function children as default scoped slot
      if (Array.isArray(children) &&
        typeof children[0] === 'function'
      ) {
        data = data || {};
        data.scopedSlots = { default: children[0] };
        children.length = 0;
      }
      if (normalizationType === ALWAYS_NORMALIZE) {
        children = normalizeChildren(children);
      } else if (normalizationType === SIMPLE_NORMALIZE) {
        children = simpleNormalizeChildren(children);
      }
      var vnode, ns;
      if (typeof tag === 'string') {
        var Ctor;
        ns = config.getTagNamespace(tag);
        if (config.isReservedTag(tag)) {
          // platform built-in elements
          vnode = new VNode(
            config.parsePlatformTagName(tag), data, children,
            undefined, undefined, context
          );
        } else if (isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
          // component
          vnode = createComponent(Ctor, data, context, children, tag);
        } else {
          // unknown or unlisted namespaced elements
          // check at runtime because it may get assigned a namespace when its
          // parent normalizes children
          vnode = new VNode(
            tag, data, children,
            undefined, undefined, context
          );
        }
      } else {
        // direct component options / constructor
        vnode = createComponent(tag, data, context, children);
      }
      if (isDef(vnode)) {
        if (ns) { applyNS(vnode, ns); }
        return vnode
      } else {
        return createEmptyVNode()
      }
    }
  
    function applyNS (vnode, ns) {
      vnode.ns = ns;
      if (vnode.tag === 'foreignObject') {
        // use default namespace inside foreignObject
        return
      }
      if (isDef(vnode.children)) {
        for (var i = 0, l = vnode.children.length; i < l; i++) {
          var child = vnode.children[i];
          if (isDef(child.tag) && isUndef(child.ns)) {
            applyNS(child, ns);
          }
        }
      }
    }
  
    /*  */
  
    /**
     * Runtime helper for rendering v-for lists.
     */
    function renderList (
      val,
      render
    ) {
      var ret, i, l, keys, key;
      if (Array.isArray(val) || typeof val === 'string') {
        ret = new Array(val.length);
        for (i = 0, l = val.length; i < l; i++) {
          ret[i] = render(val[i], i);
        }
      } else if (typeof val === 'number') {
        ret = new Array(val);
        for (i = 0; i < val; i++) {
          ret[i] = render(i + 1, i);
        }
      } else if (isObject(val)) {
        keys = Object.keys(val);
        ret = new Array(keys.length);
        for (i = 0, l = keys.length; i < l; i++) {
          key = keys[i];
          ret[i] = render(val[key], key, i);
        }
      }
      if (isDef(ret)) {
        (ret)._isVList = true;
      }
      return ret
    }
  
    /*  */
  
    /**
     * Runtime helper for rendering <slot>
     */
    function renderSlot (
      name,
      fallback,
      props,
      bindObject
    ) {
      var scopedSlotFn = this.$scopedSlots[name];
      if (scopedSlotFn) { // scoped slot
        props = props || {};
        if (bindObject) {
          extend(props, bindObject);
        }
        return scopedSlotFn(props) || fallback
      } else {
        var slotNodes = this.$slots[name];
        // warn duplicate slot usage
        if (slotNodes && "production" !== 'production') {
          slotNodes._rendered && warn$1(
            "Duplicate presence of slot \"" + name + "\" found in the same render tree " +
            "- this will likely cause render errors.",
            this
          );
          slotNodes._rendered = true;
        }
        return slotNodes || fallback
      }
    }
  
    /*  */
  
    /**
     * Runtime helper for resolving filters
     */
    function resolveFilter (id) {
      return resolveAsset(this.$options, 'filters', id, true) || identity
    }
  
    /*  */
  
    /**
     * Runtime helper for checking keyCodes from config.
     */
    function checkKeyCodes (
      eventKeyCode,
      key,
      builtInAlias
    ) {
      var keyCodes = config.keyCodes[key] || builtInAlias;
      if (Array.isArray(keyCodes)) {
        return keyCodes.indexOf(eventKeyCode) === -1
      } else {
        return keyCodes !== eventKeyCode
      }
    }
  
    /*  */
  
    /**
     * Runtime helper for merging v-bind="object" into a VNode's data.
     */
    function bindObjectProps (
      data,
      tag,
      value,
      asProp
    ) {
      if (value) {
        if (!isObject(value)) {
          "production" !== 'production' && warn$1(
            'v-bind without argument expects an Object or Array value',
            this
          );
        } else {
          if (Array.isArray(value)) {
            value = toObject(value);
          }
          var hash;
          for (var key in value) {
            if (key === 'class' || key === 'style') {
              hash = data;
            } else {
              var type = data.attrs && data.attrs.type;
              hash = asProp || config.mustUseProp(tag, type, key)
                ? data.domProps || (data.domProps = {})
                : data.attrs || (data.attrs = {});
            }
            if (!(key in hash)) {
              hash[key] = value[key];
            }
          }
        }
      }
      return data
    }
  
    /*  */
  
    /**
     * Runtime helper for rendering static trees.
     */
    function renderStatic (
      index,
      isInFor
    ) {
      var tree = this._staticTrees[index];
      // if has already-rendered static tree and not inside v-for,
      // we can reuse the same tree by doing a shallow clone.
      if (tree && !isInFor) {
        return Array.isArray(tree)
          ? cloneVNodes(tree)
          : cloneVNode(tree)
      }
      // otherwise, render a fresh tree.
      tree = this._staticTrees[index] =
        this.$options.staticRenderFns[index].call(this._renderProxy);
      markStatic(tree, ("__static__" + index), false);
      return tree
    }
  
    /**
     * Runtime helper for v-once.
     * Effectively it means marking the node as static with a unique key.
     */
    function markOnce (
      tree,
      index,
      key
    ) {
      markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
      return tree
    }
  
    function markStatic (
      tree,
      key,
      isOnce
    ) {
      if (Array.isArray(tree)) {
        for (var i = 0; i < tree.length; i++) {
          if (tree[i] && typeof tree[i] !== 'string') {
            markStaticNode(tree[i], (key + "_" + i), isOnce);
          }
        }
      } else {
        markStaticNode(tree, key, isOnce);
      }
    }
  
    function markStaticNode (node, key, isOnce) {
      node.isStatic = true;
      node.key = key;
      node.isOnce = isOnce;
    }
  
    /*  */
  
    function initRender (vm) {
      vm._vnode = null; // the root of the child tree
      vm._staticTrees = null;
      var parentVnode = vm.$vnode = vm.$options._parentVnode; // the placeholder node in parent tree
      var renderContext = parentVnode && parentVnode.context;
      vm.$slots = resolveSlots(vm.$options._renderChildren, renderContext);
      vm.$scopedSlots = emptyObject;
      // bind the createElement fn to this instance
      // so that we get proper render context inside it.
      // args order: tag, data, children, normalizationType, alwaysNormalize
      // internal version is used by render functions compiled from templates
      vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
      // normalization is always applied for the public version, used in
      // user-written render functions.
      vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
    }
  
    function renderMixin (Vue) {
      Vue.prototype.$nextTick = function (fn) {
        return nextTick(fn, this)
      };
  
      Vue.prototype._render = function () {
        var vm = this;
        var ref = vm.$options;
        var render = ref.render;
        var staticRenderFns = ref.staticRenderFns;
        var _parentVnode = ref._parentVnode;
  
        if (vm._isMounted) {
          // clone slot nodes on re-renders
          for (var key in vm.$slots) {
            vm.$slots[key] = cloneVNodes(vm.$slots[key]);
          }
        }
  
        vm.$scopedSlots = (_parentVnode && _parentVnode.data.scopedSlots) || emptyObject;
  
        if (staticRenderFns && !vm._staticTrees) {
          vm._staticTrees = [];
        }
        // set parent vnode. this allows render functions to have access
        // to the data on the placeholder node.
        vm.$vnode = _parentVnode;
        // render self
        var vnode;
        try {
          vnode = render.call(vm._renderProxy, vm.$createElement);
        } catch (e) {
          handleError(e, vm, "render function");
          // return error render result,
          // or previous vnode to prevent render error causing blank component
          /* istanbul ignore else */
          if ("production" !== 'production') {} else {
            vnode = vm._vnode;
          }
        }
        // return empty vnode in case the render function errored out
        if (!(vnode instanceof VNode)) {
          if ("production" !== 'production' && Array.isArray(vnode)) {}
          vnode = createEmptyVNode();
        }
        // set parent
        vnode.parent = _parentVnode;
        return vnode
      };
  
      // internal render helpers.
      // these are exposed on the instance prototype to reduce generated render
      // code size.
      Vue.prototype._o = markOnce;
      Vue.prototype._n = toNumber;
      Vue.prototype._s = toString;
      Vue.prototype._l = renderList;
      Vue.prototype._t = renderSlot;
      Vue.prototype._q = looseEqual;
      Vue.prototype._i = looseIndexOf;
      Vue.prototype._m = renderStatic;
      Vue.prototype._f = resolveFilter;
      Vue.prototype._k = checkKeyCodes;
      Vue.prototype._b = bindObjectProps;
      Vue.prototype._v = createTextVNode;
      Vue.prototype._e = createEmptyVNode;
      Vue.prototype._u = resolveScopedSlots;
    }
  
    /*  */
  
    var uid = 0;
  
    function initMixin (Vue) {
      Vue.prototype._init = function (options) {
        var vm = this;
        // a uid
        vm._uid = uid++;
  
        var startTag, endTag;
        /* istanbul ignore if */
        if ("production" !== 'production' && config.performance && mark) {}
  
        // a flag to avoid this being observed
        vm._isVue = true;
        // merge options
        if (options && options._isComponent) {
          // optimize internal component instantiation
          // since dynamic options merging is pretty slow, and none of the
          // internal component options needs special treatment.
          initInternalComponent(vm, options);
        } else {
          vm.$options = mergeOptions(
            resolveConstructorOptions(vm.constructor),
            options || {},
            vm
          );
        }
        /* istanbul ignore else */
        if ("production" !== 'production') {} else {
          vm._renderProxy = vm;
        }
        // expose real self
        vm._self = vm;
        initLifecycle(vm);
        initEvents(vm);
        initRender(vm);
        callHook(vm, 'beforeCreate');
        initInjections(vm); // resolve injections before data/props
        initState(vm);
        initProvide(vm); // resolve provide after data/props
        callHook(vm, 'created');
  
        /* istanbul ignore if */
        if ("production" !== 'production' && config.performance && mark) {}
  
        if (vm.$options.el) {
          vm.$mount(vm.$options.el);
        }
      };
    }
  
    function initInternalComponent (vm, options) {
      var opts = vm.$options = Object.create(vm.constructor.options);
      // doing this because it's faster than dynamic enumeration.
      opts.parent = options.parent;
      opts.propsData = options.propsData;
      opts._parentVnode = options._parentVnode;
      opts._parentListeners = options._parentListeners;
      opts._renderChildren = options._renderChildren;
      opts._componentTag = options._componentTag;
      opts._parentElm = options._parentElm;
      opts._refElm = options._refElm;
      if (options.render) {
        opts.render = options.render;
        opts.staticRenderFns = options.staticRenderFns;
      }
    }
  
    function resolveConstructorOptions (Ctor) {
      var options = Ctor.options;
      if (Ctor.super) {
        var superOptions = resolveConstructorOptions(Ctor.super);
        var cachedSuperOptions = Ctor.superOptions;
        if (superOptions !== cachedSuperOptions) {
          // super option changed,
          // need to resolve new options.
          Ctor.superOptions = superOptions;
          // check if there are any late-modified/attached options (#4976)
          var modifiedOptions = resolveModifiedOptions(Ctor);
          // update base extend options
          if (modifiedOptions) {
            extend(Ctor.extendOptions, modifiedOptions);
          }
          options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
          if (options.name) {
            options.components[options.name] = Ctor;
          }
        }
      }
      return options
    }
  
    function resolveModifiedOptions (Ctor) {
      var modified;
      var latest = Ctor.options;
      var extended = Ctor.extendOptions;
      var sealed = Ctor.sealedOptions;
      for (var key in latest) {
        if (latest[key] !== sealed[key]) {
          if (!modified) { modified = {}; }
          modified[key] = dedupe(latest[key], extended[key], sealed[key]);
        }
      }
      return modified
    }
  
    function dedupe (latest, extended, sealed) {
      // compare latest and sealed to ensure lifecycle hooks won't be duplicated
      // between merges
      if (Array.isArray(latest)) {
        var res = [];
        sealed = Array.isArray(sealed) ? sealed : [sealed];
        extended = Array.isArray(extended) ? extended : [extended];
        for (var i = 0; i < latest.length; i++) {
          // push original options and not sealed options to exclude duplicated options
          if (extended.indexOf(latest[i]) >= 0 || sealed.indexOf(latest[i]) < 0) {
            res.push(latest[i]);
          }
        }
        return res
      } else {
        return latest
      }
    }
  
    function Vue$3 (options) {
      if ("production" !== 'production' &&
        !(this instanceof Vue$3)
      ) {}
      this._init(options);
    }
  
    initMixin(Vue$3);
    stateMixin(Vue$3);
    eventsMixin(Vue$3);
    lifecycleMixin(Vue$3);
    renderMixin(Vue$3);
  
    /*  */
  
    function initUse (Vue) {
      Vue.use = function (plugin) {
        /* istanbul ignore if */
        if (plugin.installed) {
          return this
        }
        // additional parameters
        var args = toArray(arguments, 1);
        args.unshift(this);
        if (typeof plugin.install === 'function') {
          plugin.install.apply(plugin, args);
        } else if (typeof plugin === 'function') {
          plugin.apply(null, args);
        }
        plugin.installed = true;
        return this
      };
    }
  
    /*  */
  
    function initMixin$1 (Vue) {
      Vue.mixin = function (mixin) {
        this.options = mergeOptions(this.options, mixin);
        return this
      };
    }
  
    /*  */
  
    function initExtend (Vue) {
      /**
       * Each instance constructor, including Vue, has a unique
       * cid. This enables us to create wrapped "child
       * constructors" for prototypal inheritance and cache them.
       */
      Vue.cid = 0;
      var cid = 1;
  
      /**
       * Class inheritance
       */
      Vue.extend = function (extendOptions) {
        extendOptions = extendOptions || {};
        var Super = this;
        var SuperId = Super.cid;
        var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
        if (cachedCtors[SuperId]) {
          return cachedCtors[SuperId]
        }
  
        var name = extendOptions.name || Super.options.name;
        if ("production" !== 'production') {}
  
        var Sub = function VueComponent (options) {
          this._init(options);
        };
        Sub.prototype = Object.create(Super.prototype);
        Sub.prototype.constructor = Sub;
        Sub.cid = cid++;
        Sub.options = mergeOptions(
          Super.options,
          extendOptions
        );
        Sub['super'] = Super;
  
        // For props and computed properties, we define the proxy getters on
        // the Vue instances at extension time, on the extended prototype. This
        // avoids Object.defineProperty calls for each instance created.
        if (Sub.options.props) {
          initProps$1(Sub);
        }
        if (Sub.options.computed) {
          initComputed$1(Sub);
        }
  
        // allow further extension/mixin/plugin usage
        Sub.extend = Super.extend;
        Sub.mixin = Super.mixin;
        Sub.use = Super.use;
  
        // create asset registers, so extended classes
        // can have their private assets too.
        ASSET_TYPES.forEach(function (type) {
          Sub[type] = Super[type];
        });
        // enable recursive self-lookup
        if (name) {
          Sub.options.components[name] = Sub;
        }
  
        // keep a reference to the super options at extension time.
        // later at instantiation we can check if Super's options have
        // been updated.
        Sub.superOptions = Super.options;
        Sub.extendOptions = extendOptions;
        Sub.sealedOptions = extend({}, Sub.options);
  
        // cache constructor
        cachedCtors[SuperId] = Sub;
        return Sub
      };
    }
  
    function initProps$1 (Comp) {
      var props = Comp.options.props;
      for (var key in props) {
        proxy(Comp.prototype, "_props", key);
      }
    }
  
    function initComputed$1 (Comp) {
      var computed = Comp.options.computed;
      for (var key in computed) {
        defineComputed(Comp.prototype, key, computed[key]);
      }
    }
  
    /*  */
  
    function initAssetRegisters (Vue) {
      /**
       * Create asset registration methods.
       */
      ASSET_TYPES.forEach(function (type) {
        Vue[type] = function (
          id,
          definition
        ) {
          if (!definition) {
            return this.options[type + 's'][id]
          } else {
            /* istanbul ignore if */
            if ("production" !== 'production') {}
            if (type === 'component' && isPlainObject(definition)) {
              definition.name = definition.name || id;
              definition = this.options._base.extend(definition);
            }
            if (type === 'directive' && typeof definition === 'function') {
              definition = { bind: definition, update: definition };
            }
            this.options[type + 's'][id] = definition;
            return definition
          }
        };
      });
    }
  
    /*  */
  
    var patternTypes = [String, RegExp];
  
    function getComponentName (opts) {
      return opts && (opts.Ctor.options.name || opts.tag)
    }
  
    function matches (pattern, name) {
      if (typeof pattern === 'string') {
        return pattern.split(',').indexOf(name) > -1
      } else if (isRegExp(pattern)) {
        return pattern.test(name)
      }
      /* istanbul ignore next */
      return false
    }
  
    function pruneCache (cache, current, filter) {
      for (var key in cache) {
        var cachedNode = cache[key];
        if (cachedNode) {
          var name = getComponentName(cachedNode.componentOptions);
          if (name && !filter(name)) {
            if (cachedNode !== current) {
              pruneCacheEntry(cachedNode);
            }
            cache[key] = null;
          }
        }
      }
    }
  
    function pruneCacheEntry (vnode) {
      if (vnode) {
        vnode.componentInstance.$destroy();
      }
    }
  
    var KeepAlive = {
      name: 'keep-alive',
      abstract: true,
  
      props: {
        include: patternTypes,
        exclude: patternTypes
      },
  
      created: function created () {
        this.cache = Object.create(null);
      },
  
      destroyed: function destroyed () {
        var this$1 = this;
  
        for (var key in this$1.cache) {
          pruneCacheEntry(this$1.cache[key]);
        }
      },
  
      watch: {
        include: function include (val) {
          pruneCache(this.cache, this._vnode, function (name) { return matches(val, name); });
        },
        exclude: function exclude (val) {
          pruneCache(this.cache, this._vnode, function (name) { return !matches(val, name); });
        }
      },
  
      render: function render () {
        var vnode = getFirstComponentChild(this.$slots.default);
        var componentOptions = vnode && vnode.componentOptions;
        if (componentOptions) {
          // check pattern
          var name = getComponentName(componentOptions);
          if (name && (
            (this.include && !matches(this.include, name)) ||
            (this.exclude && matches(this.exclude, name))
          )) {
            return vnode
          }
          var key = vnode.key == null
            // same constructor may get registered as different local components
            // so cid alone is not enough (#3269)
            ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
            : vnode.key;
          if (this.cache[key]) {
            vnode.componentInstance = this.cache[key].componentInstance;
          } else {
            this.cache[key] = vnode;
          }
          vnode.data.keepAlive = true;
        }
        return vnode
      }
    };
  
    var builtInComponents = {
      KeepAlive: KeepAlive
    };
  
    /*  */
  
    function initGlobalAPI (Vue) {
      // config
      var configDef = {};
      configDef.get = function () { return config; };
      if ("production" !== 'production') {}
      Object.defineProperty(Vue, 'config', configDef);
  
      // exposed util methods.
      // NOTE: these are not considered part of the public API - avoid relying on
      // them unless you are aware of the risk.
      Vue.util = {
        warn: warn$1,
        extend: extend,
        mergeOptions: mergeOptions,
        defineReactive: defineReactive$$1
      };
  
      Vue.set = set;
      Vue.delete = del;
      Vue.nextTick = nextTick;
  
      Vue.options = Object.create(null);
      ASSET_TYPES.forEach(function (type) {
        Vue.options[type + 's'] = Object.create(null);
      });
  
      // this is used to identify the "base" constructor to extend all plain-object
      // components with in Weex's multi-instance scenarios.
      Vue.options._base = Vue;
  
      extend(Vue.options.components, builtInComponents);
  
      initUse(Vue);
      initMixin$1(Vue);
      initExtend(Vue);
      initAssetRegisters(Vue);
    }
  
    initGlobalAPI(Vue$3);
  
    Object.defineProperty(Vue$3.prototype, '$isServer', {
      get: isServerRendering
    });
  
    Object.defineProperty(Vue$3.prototype, '$ssrContext', {
      get: function get () {
        /* istanbul ignore next */
        return this.$vnode.ssrContext
      }
    });
  
    Vue$3.version = '2.3.3';
  
    /*  */
  
    // these are reserved for web because they are directly compiled away
    // during template compilation
    var isReservedAttr = makeMap('style,class');
  
    // attributes that should be using props for binding
    var acceptValue = makeMap('input,textarea,option,select');
    var mustUseProp = function (tag, type, attr) {
      return (
        (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
        (attr === 'selected' && tag === 'option') ||
        (attr === 'checked' && tag === 'input') ||
        (attr === 'muted' && tag === 'video')
      )
    };
  
    var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');
  
    var isBooleanAttr = makeMap(
      'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
      'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
      'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
      'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
      'required,reversed,scoped,seamless,selected,sortable,translate,' +
      'truespeed,typemustmatch,visible'
    );
  
    var xlinkNS = 'http://www.w3.org/1999/xlink';
  
    var isXlink = function (name) {
      return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
    };
  
    var getXlinkProp = function (name) {
      return isXlink(name) ? name.slice(6, name.length) : ''
    };
  
    var isFalsyAttrValue = function (val) {
      return val == null || val === false
    };
  
    /*  */
  
    function genClassForVnode (vnode) {
      var data = vnode.data;
      var parentNode = vnode;
      var childNode = vnode;
      while (isDef(childNode.componentInstance)) {
        childNode = childNode.componentInstance._vnode;
        if (childNode.data) {
          data = mergeClassData(childNode.data, data);
        }
      }
      while (isDef(parentNode = parentNode.parent)) {
        if (parentNode.data) {
          data = mergeClassData(data, parentNode.data);
        }
      }
      return genClassFromData(data)
    }
  
    function mergeClassData (child, parent) {
      return {
        staticClass: concat(child.staticClass, parent.staticClass),
        class: isDef(child.class)
          ? [child.class, parent.class]
          : parent.class
      }
    }
  
    function genClassFromData (data) {
      var dynamicClass = data.class;
      var staticClass = data.staticClass;
      if (isDef(staticClass) || isDef(dynamicClass)) {
        return concat(staticClass, stringifyClass(dynamicClass))
      }
      /* istanbul ignore next */
      return ''
    }
  
    function concat (a, b) {
      return a ? b ? (a + ' ' + b) : a : (b || '')
    }
  
    function stringifyClass (value) {
      if (isUndef(value)) {
        return ''
      }
      if (typeof value === 'string') {
        return value
      }
      var res = '';
      if (Array.isArray(value)) {
        var stringified;
        for (var i = 0, l = value.length; i < l; i++) {
          if (isDef(value[i])) {
            if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
              res += stringified + ' ';
            }
          }
        }
        return res.slice(0, -1)
      }
      if (isObject(value)) {
        for (var key in value) {
          if (value[key]) { res += key + ' '; }
        }
        return res.slice(0, -1)
      }
      /* istanbul ignore next */
      return res
    }
  
    /*  */
  
    var namespaceMap = {
      svg: 'http://www.w3.org/2000/svg',
      math: 'http://www.w3.org/1998/Math/MathML'
    };
  
    var isHTMLTag = makeMap(
      'html,body,base,head,link,meta,style,title,' +
      'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
      'div,dd,dl,dt,figcaption,figure,hr,img,li,main,ol,p,pre,ul,' +
      'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
      's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
      'embed,object,param,source,canvas,script,noscript,del,ins,' +
      'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
      'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
      'output,progress,select,textarea,' +
      'details,dialog,menu,menuitem,summary,' +
      'content,element,shadow,template'
    );
  
    // this map is intentionally selective, only covering SVG elements that may
    // contain child elements.
    var isSVG = makeMap(
      'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
      'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
      'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
      true
    );
  
  
  
    var isReservedTag = function (tag) {
      return isHTMLTag(tag) || isSVG(tag)
    };
  
    function getTagNamespace (tag) {
      if (isSVG(tag)) {
        return 'svg'
      }
      // basic support for MathML
      // note it doesn't support other MathML elements being component roots
      if (tag === 'math') {
        return 'math'
      }
    }
  
    var unknownElementCache = Object.create(null);
    function isUnknownElement (tag) {
      /* istanbul ignore if */
      if (!inBrowser) {
        return true
      }
      if (isReservedTag(tag)) {
        return false
      }
      tag = tag.toLowerCase();
      /* istanbul ignore if */
      if (unknownElementCache[tag] != null) {
        return unknownElementCache[tag]
      }
      var el = document.createElement(tag);
      if (tag.indexOf('-') > -1) {
        // http://stackoverflow.com/a/28210364/1070244
        return (unknownElementCache[tag] = (
          el.constructor === window.HTMLUnknownElement ||
          el.constructor === window.HTMLElement
        ))
      } else {
        return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
      }
    }
  
    /*  */
  
    /**
     * Query an element selector if it's not an element already.
     */
    function query (el) {
      if (typeof el === 'string') {
        var selected = document.querySelector(el);
        if (!selected) {
          "production" !== 'production' && warn$1(
            'Cannot find element: ' + el
          );
          return document.createElement('div')
        }
        return selected
      } else {
        return el
      }
    }
  
    /*  */
  
    function createElement$1 (tagName, vnode) {
      var elm = document.createElement(tagName);
      if (tagName !== 'select') {
        return elm
      }
      // false or null will remove the attribute but undefined will not
      if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
        elm.setAttribute('multiple', 'multiple');
      }
      return elm
    }
  
    function createElementNS (namespace, tagName) {
      return document.createElementNS(namespaceMap[namespace], tagName)
    }
  
    function createTextNode (text) {
      return document.createTextNode(text)
    }
  
    function createComment (text) {
      return document.createComment(text)
    }
  
    function insertBefore (parentNode, newNode, referenceNode) {
      parentNode.insertBefore(newNode, referenceNode);
    }
  
    function removeChild (node, child) {
      node.removeChild(child);
    }
  
    function appendChild (node, child) {
      node.appendChild(child);
    }
  
    function parentNode (node) {
      return node.parentNode
    }
  
    function nextSibling (node) {
      return node.nextSibling
    }
  
    function tagName (node) {
      return node.tagName
    }
  
    function setTextContent (node, text) {
      node.textContent = text;
    }
  
    function setAttribute (node, key, val) {
      node.setAttribute(key, val);
    }
  
  
    var nodeOps = Object.freeze({
    	createElement: createElement$1,
    	createElementNS: createElementNS,
    	createTextNode: createTextNode,
    	createComment: createComment,
    	insertBefore: insertBefore,
    	removeChild: removeChild,
    	appendChild: appendChild,
    	parentNode: parentNode,
    	nextSibling: nextSibling,
    	tagName: tagName,
    	setTextContent: setTextContent,
    	setAttribute: setAttribute
    });
  
    /*  */
  
    var ref = {
      create: function create (_, vnode) {
        registerRef(vnode);
      },
      update: function update (oldVnode, vnode) {
        if (oldVnode.data.ref !== vnode.data.ref) {
          registerRef(oldVnode, true);
          registerRef(vnode);
        }
      },
      destroy: function destroy (vnode) {
        registerRef(vnode, true);
      }
    };
  
    function registerRef (vnode, isRemoval) {
      var key = vnode.data.ref;
      if (!key) { return }
  
      var vm = vnode.context;
      var ref = vnode.componentInstance || vnode.elm;
      var refs = vm.$refs;
      if (isRemoval) {
        if (Array.isArray(refs[key])) {
          remove(refs[key], ref);
        } else if (refs[key] === ref) {
          refs[key] = undefined;
        }
      } else {
        if (vnode.data.refInFor) {
          if (Array.isArray(refs[key]) && refs[key].indexOf(ref) < 0) {
            refs[key].push(ref);
          } else {
            refs[key] = [ref];
          }
        } else {
          refs[key] = ref;
        }
      }
    }
  
    /**
     * Virtual DOM patching algorithm based on Snabbdom by
     * Simon Friis Vindum (@paldepind)
     * Licensed under the MIT License
     * https://github.com/paldepind/snabbdom/blob/master/LICENSE
     *
     * modified by Evan You (@yyx990803)
     *
  
    /*
     * Not type-checking this because this file is perf-critical and the cost
     * of making flow understand it is not worth it.
     */
  
    var emptyNode = new VNode('', {}, []);
  
    var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];
  
    function sameVnode (a, b) {
      return (
        a.key === b.key &&
        a.tag === b.tag &&
        a.isComment === b.isComment &&
        isDef(a.data) === isDef(b.data) &&
        sameInputType(a, b)
      )
    }
  
    // Some browsers do not support dynamically changing type for <input>
    // so they need to be treated as different nodes
    function sameInputType (a, b) {
      if (a.tag !== 'input') { return true }
      var i;
      var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
      var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
      return typeA === typeB
    }
  
    function createKeyToOldIdx (children, beginIdx, endIdx) {
      var i, key;
      var map = {};
      for (i = beginIdx; i <= endIdx; ++i) {
        key = children[i].key;
        if (isDef(key)) { map[key] = i; }
      }
      return map
    }
  
    function createPatchFunction (backend) {
      var i, j;
      var cbs = {};
  
      var modules = backend.modules;
      var nodeOps = backend.nodeOps;
  
      for (i = 0; i < hooks.length; ++i) {
        cbs[hooks[i]] = [];
        for (j = 0; j < modules.length; ++j) {
          if (isDef(modules[j][hooks[i]])) {
            cbs[hooks[i]].push(modules[j][hooks[i]]);
          }
        }
      }
  
      function emptyNodeAt (elm) {
        return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
      }
  
      function createRmCb (childElm, listeners) {
        function remove$$1 () {
          if (--remove$$1.listeners === 0) {
            removeNode(childElm);
          }
        }
        remove$$1.listeners = listeners;
        return remove$$1
      }
  
      function removeNode (el) {
        var parent = nodeOps.parentNode(el);
        // element may have already been removed due to v-html / v-text
        if (isDef(parent)) {
          nodeOps.removeChild(parent, el);
        }
      }
  
      var inPre = 0;
      function createElm (vnode, insertedVnodeQueue, parentElm, refElm, nested) {
        vnode.isRootInsert = !nested; // for transition enter check
        if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
          return
        }
  
        var data = vnode.data;
        var children = vnode.children;
        var tag = vnode.tag;
        if (isDef(tag)) {
          if ("production" !== 'production') {}
          vnode.elm = vnode.ns
            ? nodeOps.createElementNS(vnode.ns, tag)
            : nodeOps.createElement(tag, vnode);
          setScope(vnode);
  
          /* istanbul ignore if */
          {
            createChildren(vnode, children, insertedVnodeQueue);
            if (isDef(data)) {
              invokeCreateHooks(vnode, insertedVnodeQueue);
            }
            insert(parentElm, vnode.elm, refElm);
          }
  
          if ("production" !== 'production' && data && data.pre) {}
        } else if (isTrue(vnode.isComment)) {
          vnode.elm = nodeOps.createComment(vnode.text);
          insert(parentElm, vnode.elm, refElm);
        } else {
          vnode.elm = nodeOps.createTextNode(vnode.text);
          insert(parentElm, vnode.elm, refElm);
        }
      }
  
      function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
        var i = vnode.data;
        if (isDef(i)) {
          var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
          if (isDef(i = i.hook) && isDef(i = i.init)) {
            i(vnode, false /* hydrating */, parentElm, refElm);
          }
          // after calling the init hook, if the vnode is a child component
          // it should've created a child instance and mounted it. the child
          // component also has set the placeholder vnode's elm.
          // in that case we can just return the element and be done.
          if (isDef(vnode.componentInstance)) {
            initComponent(vnode, insertedVnodeQueue);
            if (isTrue(isReactivated)) {
              reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
            }
            return true
          }
        }
      }
  
      function initComponent (vnode, insertedVnodeQueue) {
        if (isDef(vnode.data.pendingInsert)) {
          insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
        }
        vnode.elm = vnode.componentInstance.$el;
        if (isPatchable(vnode)) {
          invokeCreateHooks(vnode, insertedVnodeQueue);
          setScope(vnode);
        } else {
          // empty component root.
          // skip all element-related modules except for ref (#3455)
          registerRef(vnode);
          // make sure to invoke the insert hook
          insertedVnodeQueue.push(vnode);
        }
      }
  
      function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
        var i;
        // hack for #4339: a reactivated component with inner transition
        // does not trigger because the inner node's created hooks are not called
        // again. It's not ideal to involve module-specific logic in here but
        // there doesn't seem to be a better way to do it.
        var innerNode = vnode;
        while (innerNode.componentInstance) {
          innerNode = innerNode.componentInstance._vnode;
          if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
            for (i = 0; i < cbs.activate.length; ++i) {
              cbs.activate[i](emptyNode, innerNode);
            }
            insertedVnodeQueue.push(innerNode);
            break
          }
        }
        // unlike a newly created component,
        // a reactivated keep-alive component doesn't insert itself
        insert(parentElm, vnode.elm, refElm);
      }
  
      function insert (parent, elm, ref) {
        if (isDef(parent)) {
          if (isDef(ref)) {
            if (ref.parentNode === parent) {
              nodeOps.insertBefore(parent, elm, ref);
            }
          } else {
            nodeOps.appendChild(parent, elm);
          }
        }
      }
  
      function createChildren (vnode, children, insertedVnodeQueue) {
        if (Array.isArray(children)) {
          for (var i = 0; i < children.length; ++i) {
            createElm(children[i], insertedVnodeQueue, vnode.elm, null, true);
          }
        } else if (isPrimitive(vnode.text)) {
          nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(vnode.text));
        }
      }
  
      function isPatchable (vnode) {
        while (vnode.componentInstance) {
          vnode = vnode.componentInstance._vnode;
        }
        return isDef(vnode.tag)
      }
  
      function invokeCreateHooks (vnode, insertedVnodeQueue) {
        for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
          cbs.create[i$1](emptyNode, vnode);
        }
        i = vnode.data.hook; // Reuse variable
        if (isDef(i)) {
          if (isDef(i.create)) { i.create(emptyNode, vnode); }
          if (isDef(i.insert)) { insertedVnodeQueue.push(vnode); }
        }
      }
  
      // set scope id attribute for scoped CSS.
      // this is implemented as a special case to avoid the overhead
      // of going through the normal attribute patching process.
      function setScope (vnode) {
        var i;
        var ancestor = vnode;
        while (ancestor) {
          if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
            nodeOps.setAttribute(vnode.elm, i, '');
          }
          ancestor = ancestor.parent;
        }
        // for slot content they should also get the scopeId from the host instance.
        if (isDef(i = activeInstance) &&
          i !== vnode.context &&
          isDef(i = i.$options._scopeId)
        ) {
          nodeOps.setAttribute(vnode.elm, i, '');
        }
      }
  
      function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
        for (; startIdx <= endIdx; ++startIdx) {
          createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm);
        }
      }
  
      function invokeDestroyHook (vnode) {
        var i, j;
        var data = vnode.data;
        if (isDef(data)) {
          if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
          for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
        }
        if (isDef(i = vnode.children)) {
          for (j = 0; j < vnode.children.length; ++j) {
            invokeDestroyHook(vnode.children[j]);
          }
        }
      }
  
      function removeVnodes (parentElm, vnodes, startIdx, endIdx) {
        for (; startIdx <= endIdx; ++startIdx) {
          var ch = vnodes[startIdx];
          if (isDef(ch)) {
            if (isDef(ch.tag)) {
              removeAndInvokeRemoveHook(ch);
              invokeDestroyHook(ch);
            } else { // Text node
              removeNode(ch.elm);
            }
          }
        }
      }
  
      function removeAndInvokeRemoveHook (vnode, rm) {
        if (isDef(rm) || isDef(vnode.data)) {
          var i;
          var listeners = cbs.remove.length + 1;
          if (isDef(rm)) {
            // we have a recursively passed down rm callback
            // increase the listeners count
            rm.listeners += listeners;
          } else {
            // directly removing
            rm = createRmCb(vnode.elm, listeners);
          }
          // recursively invoke hooks on child component root node
          if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
            removeAndInvokeRemoveHook(i, rm);
          }
          for (i = 0; i < cbs.remove.length; ++i) {
            cbs.remove[i](vnode, rm);
          }
          if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
            i(vnode, rm);
          } else {
            rm();
          }
        } else {
          removeNode(vnode.elm);
        }
      }
  
      function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
        var oldStartIdx = 0;
        var newStartIdx = 0;
        var oldEndIdx = oldCh.length - 1;
        var oldStartVnode = oldCh[0];
        var oldEndVnode = oldCh[oldEndIdx];
        var newEndIdx = newCh.length - 1;
        var newStartVnode = newCh[0];
        var newEndVnode = newCh[newEndIdx];
        var oldKeyToIdx, idxInOld, elmToMove, refElm;
  
        // removeOnly is a special flag used only by <transition-group>
        // to ensure removed elements stay in correct relative positions
        // during leaving transitions
        var canMove = !removeOnly;
  
        while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
          if (isUndef(oldStartVnode)) {
            oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
          } else if (isUndef(oldEndVnode)) {
            oldEndVnode = oldCh[--oldEndIdx];
          } else if (sameVnode(oldStartVnode, newStartVnode)) {
            patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
            oldStartVnode = oldCh[++oldStartIdx];
            newStartVnode = newCh[++newStartIdx];
          } else if (sameVnode(oldEndVnode, newEndVnode)) {
            patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
            oldEndVnode = oldCh[--oldEndIdx];
            newEndVnode = newCh[--newEndIdx];
          } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
            patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
            canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
            oldStartVnode = oldCh[++oldStartIdx];
            newEndVnode = newCh[--newEndIdx];
          } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
            patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
            canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
            oldEndVnode = oldCh[--oldEndIdx];
            newStartVnode = newCh[++newStartIdx];
          } else {
            if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
            idxInOld = isDef(newStartVnode.key) ? oldKeyToIdx[newStartVnode.key] : null;
            if (isUndef(idxInOld)) { // New element
              createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
              newStartVnode = newCh[++newStartIdx];
            } else {
              elmToMove = oldCh[idxInOld];
              /* istanbul ignore if */
              if ("production" !== 'production' && !elmToMove) {}
              if (sameVnode(elmToMove, newStartVnode)) {
                patchVnode(elmToMove, newStartVnode, insertedVnodeQueue);
                oldCh[idxInOld] = undefined;
                canMove && nodeOps.insertBefore(parentElm, newStartVnode.elm, oldStartVnode.elm);
                newStartVnode = newCh[++newStartIdx];
              } else {
                // same key but different element. treat as new element
                createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
                newStartVnode = newCh[++newStartIdx];
              }
            }
          }
        }
        if (oldStartIdx > oldEndIdx) {
          refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
          addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
        } else if (newStartIdx > newEndIdx) {
          removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
        }
      }
  
      function patchVnode (oldVnode, vnode, insertedVnodeQueue, removeOnly) {
        if (oldVnode === vnode) {
          return
        }
        // reuse element for static trees.
        // note we only do this if the vnode is cloned -
        // if the new node is not cloned it means the render functions have been
        // reset by the hot-reload-api and we need to do a proper re-render.
        if (isTrue(vnode.isStatic) &&
          isTrue(oldVnode.isStatic) &&
          vnode.key === oldVnode.key &&
          (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
        ) {
          vnode.elm = oldVnode.elm;
          vnode.componentInstance = oldVnode.componentInstance;
          return
        }
        var i;
        var data = vnode.data;
        if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
          i(oldVnode, vnode);
        }
        var elm = vnode.elm = oldVnode.elm;
        var oldCh = oldVnode.children;
        var ch = vnode.children;
        if (isDef(data) && isPatchable(vnode)) {
          for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
          if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
        }
        if (isUndef(vnode.text)) {
          if (isDef(oldCh) && isDef(ch)) {
            if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
          } else if (isDef(ch)) {
            if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
            addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
          } else if (isDef(oldCh)) {
            removeVnodes(elm, oldCh, 0, oldCh.length - 1);
          } else if (isDef(oldVnode.text)) {
            nodeOps.setTextContent(elm, '');
          }
        } else if (oldVnode.text !== vnode.text) {
          nodeOps.setTextContent(elm, vnode.text);
        }
        if (isDef(data)) {
          if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
        }
      }
  
      function invokeInsertHook (vnode, queue, initial) {
        // delay insert hooks for component root nodes, invoke them after the
        // element is really inserted
        if (isTrue(initial) && isDef(vnode.parent)) {
          vnode.parent.data.pendingInsert = queue;
        } else {
          for (var i = 0; i < queue.length; ++i) {
            queue[i].data.hook.insert(queue[i]);
          }
        }
      }
  
      var bailed = false;
      // list of modules that can skip create hook during hydration because they
      // are already rendered on the client or has no need for initialization
      var isRenderedModule = makeMap('attrs,style,class,staticClass,staticStyle,key');
  
      // Note: this is a browser-only function so we can assume elms are DOM nodes.
      function hydrate (elm, vnode, insertedVnodeQueue) {
        if ("production" !== 'production') {}
        vnode.elm = elm;
        var tag = vnode.tag;
        var data = vnode.data;
        var children = vnode.children;
        if (isDef(data)) {
          if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
          if (isDef(i = vnode.componentInstance)) {
            // child component. it should have hydrated its own tree.
            initComponent(vnode, insertedVnodeQueue);
            return true
          }
        }
        if (isDef(tag)) {
          if (isDef(children)) {
            // empty element, allow client to pick up and populate children
            if (!elm.hasChildNodes()) {
              createChildren(vnode, children, insertedVnodeQueue);
            } else {
              var childrenMatch = true;
              var childNode = elm.firstChild;
              for (var i$1 = 0; i$1 < children.length; i$1++) {
                if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue)) {
                  childrenMatch = false;
                  break
                }
                childNode = childNode.nextSibling;
              }
              // if childNode is not null, it means the actual childNodes list is
              // longer than the virtual children list.
              if (!childrenMatch || childNode) {
                if ("production" !== 'production' &&
                  typeof console !== 'undefined' &&
                  !bailed
                ) {}
                return false
              }
            }
          }
          if (isDef(data)) {
            for (var key in data) {
              if (!isRenderedModule(key)) {
                invokeCreateHooks(vnode, insertedVnodeQueue);
                break
              }
            }
          }
        } else if (elm.data !== vnode.text) {
          elm.data = vnode.text;
        }
        return true
      }
  
      function assertNodeMatch (node, vnode) {
        if (isDef(vnode.tag)) {
          return (
            vnode.tag.indexOf('vue-component') === 0 ||
            vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
          )
        } else {
          return node.nodeType === (vnode.isComment ? 8 : 3)
        }
      }
  
      return function patch (oldVnode, vnode, hydrating, removeOnly, parentElm, refElm) {
        if (isUndef(vnode)) {
          if (isDef(oldVnode)) { invokeDestroyHook(oldVnode); }
          return
        }
  
        var isInitialPatch = false;
        var insertedVnodeQueue = [];
  
        if (isUndef(oldVnode)) {
          // empty mount (likely as component), create new root element
          isInitialPatch = true;
          createElm(vnode, insertedVnodeQueue, parentElm, refElm);
        } else {
          var isRealElement = isDef(oldVnode.nodeType);
          if (!isRealElement && sameVnode(oldVnode, vnode)) {
            // patch existing root node
            patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly);
          } else {
            if (isRealElement) {
              // mounting to a real element
              // check if this is server-rendered content and if we can perform
              // a successful hydration.
              if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
                oldVnode.removeAttribute(SSR_ATTR);
                hydrating = true;
              }
              if (isTrue(hydrating)) {
                if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
                  invokeInsertHook(vnode, insertedVnodeQueue, true);
                  return oldVnode
                } else if ("production" !== 'production') {}
              }
              // either not server-rendered, or hydration failed.
              // create an empty node and replace it
              oldVnode = emptyNodeAt(oldVnode);
            }
            // replacing existing element
            var oldElm = oldVnode.elm;
            var parentElm$1 = nodeOps.parentNode(oldElm);
            createElm(
              vnode,
              insertedVnodeQueue,
              // extremely rare edge case: do not insert if old element is in a
              // leaving transition. Only happens when combining transition +
              // keep-alive + HOCs. (#4590)
              oldElm._leaveCb ? null : parentElm$1,
              nodeOps.nextSibling(oldElm)
            );
  
            if (isDef(vnode.parent)) {
              // component root element replaced.
              // update parent placeholder node element, recursively
              var ancestor = vnode.parent;
              while (ancestor) {
                ancestor.elm = vnode.elm;
                ancestor = ancestor.parent;
              }
              if (isPatchable(vnode)) {
                for (var i = 0; i < cbs.create.length; ++i) {
                  cbs.create[i](emptyNode, vnode.parent);
                }
              }
            }
  
            if (isDef(parentElm$1)) {
              removeVnodes(parentElm$1, [oldVnode], 0, 0);
            } else if (isDef(oldVnode.tag)) {
              invokeDestroyHook(oldVnode);
            }
          }
        }
  
        invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
        return vnode.elm
      }
    }
  
    /*  */
  
    var directives = {
      create: updateDirectives,
      update: updateDirectives,
      destroy: function unbindDirectives (vnode) {
        updateDirectives(vnode, emptyNode);
      }
    };
  
    function updateDirectives (oldVnode, vnode) {
      if (oldVnode.data.directives || vnode.data.directives) {
        _update(oldVnode, vnode);
      }
    }
  
    function _update (oldVnode, vnode) {
      var isCreate = oldVnode === emptyNode;
      var isDestroy = vnode === emptyNode;
      var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
      var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);
  
      var dirsWithInsert = [];
      var dirsWithPostpatch = [];
  
      var key, oldDir, dir;
      for (key in newDirs) {
        oldDir = oldDirs[key];
        dir = newDirs[key];
        if (!oldDir) {
          // new directive, bind
          callHook$1(dir, 'bind', vnode, oldVnode);
          if (dir.def && dir.def.inserted) {
            dirsWithInsert.push(dir);
          }
        } else {
          // existing directive, update
          dir.oldValue = oldDir.value;
          callHook$1(dir, 'update', vnode, oldVnode);
          if (dir.def && dir.def.componentUpdated) {
            dirsWithPostpatch.push(dir);
          }
        }
      }
  
      if (dirsWithInsert.length) {
        var callInsert = function () {
          for (var i = 0; i < dirsWithInsert.length; i++) {
            callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
          }
        };
        if (isCreate) {
          mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'insert', callInsert);
        } else {
          callInsert();
        }
      }
  
      if (dirsWithPostpatch.length) {
        mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'postpatch', function () {
          for (var i = 0; i < dirsWithPostpatch.length; i++) {
            callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
          }
        });
      }
  
      if (!isCreate) {
        for (key in oldDirs) {
          if (!newDirs[key]) {
            // no longer present, unbind
            callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
          }
        }
      }
    }
  
    var emptyModifiers = Object.create(null);
  
    function normalizeDirectives$1 (
      dirs,
      vm
    ) {
      var res = Object.create(null);
      if (!dirs) {
        return res
      }
      var i, dir;
      for (i = 0; i < dirs.length; i++) {
        dir = dirs[i];
        if (!dir.modifiers) {
          dir.modifiers = emptyModifiers;
        }
        res[getRawDirName(dir)] = dir;
        dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
      }
      return res
    }
  
    function getRawDirName (dir) {
      return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
    }
  
    function callHook$1 (dir, hook, vnode, oldVnode, isDestroy) {
      var fn = dir.def && dir.def[hook];
      if (fn) {
        try {
          fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
        } catch (e) {
          handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
        }
      }
    }
  
    var baseModules = [
      ref,
      directives
    ];
  
    /*  */
  
    function updateAttrs (oldVnode, vnode) {
      if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
        return
      }
      var key, cur, old;
      var elm = vnode.elm;
      var oldAttrs = oldVnode.data.attrs || {};
      var attrs = vnode.data.attrs || {};
      // clone observed objects, as the user probably wants to mutate it
      if (isDef(attrs.__ob__)) {
        attrs = vnode.data.attrs = extend({}, attrs);
      }
  
      for (key in attrs) {
        cur = attrs[key];
        old = oldAttrs[key];
        if (old !== cur) {
          setAttr(elm, key, cur);
        }
      }
      // #4391: in IE9, setting type can reset value for input[type=radio]
      /* istanbul ignore if */
      if (isIE9 && attrs.value !== oldAttrs.value) {
        setAttr(elm, 'value', attrs.value);
      }
      for (key in oldAttrs) {
        if (isUndef(attrs[key])) {
          if (isXlink(key)) {
            elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
          } else if (!isEnumeratedAttr(key)) {
            elm.removeAttribute(key);
          }
        }
      }
    }
  
    function setAttr (el, key, value) {
      if (isBooleanAttr(key)) {
        // set attribute for blank value
        // e.g. <option disabled>Select one</option>
        if (isFalsyAttrValue(value)) {
          el.removeAttribute(key);
        } else {
          el.setAttribute(key, key);
        }
      } else if (isEnumeratedAttr(key)) {
        el.setAttribute(key, isFalsyAttrValue(value) || value === 'false' ? 'false' : 'true');
      } else if (isXlink(key)) {
        if (isFalsyAttrValue(value)) {
          el.removeAttributeNS(xlinkNS, getXlinkProp(key));
        } else {
          el.setAttributeNS(xlinkNS, key, value);
        }
      } else {
        if (isFalsyAttrValue(value)) {
          el.removeAttribute(key);
        } else {
          el.setAttribute(key, value);
        }
      }
    }
  
    var attrs = {
      create: updateAttrs,
      update: updateAttrs
    };
  
    /*  */
  
    function updateClass (oldVnode, vnode) {
      var el = vnode.elm;
      var data = vnode.data;
      var oldData = oldVnode.data;
      if (
        isUndef(data.staticClass) &&
        isUndef(data.class) && (
          isUndef(oldData) || (
            isUndef(oldData.staticClass) &&
            isUndef(oldData.class)
          )
        )
      ) {
        return
      }
  
      var cls = genClassForVnode(vnode);
  
      // handle transition classes
      var transitionClass = el._transitionClasses;
      if (isDef(transitionClass)) {
        cls = concat(cls, stringifyClass(transitionClass));
      }
  
      // set the class
      if (cls !== el._prevClass) {
        el.setAttribute('class', cls);
        el._prevClass = cls;
      }
    }
  
    var klass = {
      create: updateClass,
      update: updateClass
    };
  
    /*  */
  
    // in some cases, the event used has to be determined at runtime
    // so we used some reserved tokens during compile.
    var RANGE_TOKEN = '__r';
    var CHECKBOX_RADIO_TOKEN = '__c';
  
    /*  */
  
    // normalize v-model event tokens that can only be determined at runtime.
    // it's important to place the event as the first in the array because
    // the whole point is ensuring the v-model callback gets called before
    // user-attached handlers.
    function normalizeEvents (on) {
      var event;
      /* istanbul ignore if */
      if (isDef(on[RANGE_TOKEN])) {
        // IE input[type=range] only supports `change` event
        event = isIE ? 'change' : 'input';
        on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
        delete on[RANGE_TOKEN];
      }
      if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
        // Chrome fires microtasks in between click/change, leads to #4521
        event = isChrome ? 'click' : 'change';
        on[event] = [].concat(on[CHECKBOX_RADIO_TOKEN], on[event] || []);
        delete on[CHECKBOX_RADIO_TOKEN];
      }
    }
  
    var target$1;
  
    function add$1 (
      event,
      handler,
      once$$1,
      capture,
      passive
    ) {
      if (once$$1) {
        var oldHandler = handler;
        var _target = target$1; // save current target element in closure
        handler = function (ev) {
          var res = arguments.length === 1
            ? oldHandler(ev)
            : oldHandler.apply(null, arguments);
          if (res !== null) {
            remove$2(event, handler, capture, _target);
          }
        };
      }
      target$1.addEventListener(
        event,
        handler,
        supportsPassive
          ? { capture: capture, passive: passive }
          : capture
      );
    }
  
    function remove$2 (
      event,
      handler,
      capture,
      _target
    ) {
      (_target || target$1).removeEventListener(event, handler, capture);
    }
  
    function updateDOMListeners (oldVnode, vnode) {
      if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
        return
      }
      var on = vnode.data.on || {};
      var oldOn = oldVnode.data.on || {};
      target$1 = vnode.elm;
      normalizeEvents(on);
      updateListeners(on, oldOn, add$1, remove$2, vnode.context);
    }
  
    var events = {
      create: updateDOMListeners,
      update: updateDOMListeners
    };
  
    /*  */
  
    function updateDOMProps (oldVnode, vnode) {
      if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
        return
      }
      var key, cur;
      var elm = vnode.elm;
      var oldProps = oldVnode.data.domProps || {};
      var props = vnode.data.domProps || {};
      // clone observed objects, as the user probably wants to mutate it
      if (isDef(props.__ob__)) {
        props = vnode.data.domProps = extend({}, props);
      }
  
      for (key in oldProps) {
        if (isUndef(props[key])) {
          elm[key] = '';
        }
      }
      for (key in props) {
        cur = props[key];
        // ignore children if the node has textContent or innerHTML,
        // as these will throw away existing DOM nodes and cause removal errors
        // on subsequent patches (#3360)
        if (key === 'textContent' || key === 'innerHTML') {
          if (vnode.children) { vnode.children.length = 0; }
          if (cur === oldProps[key]) { continue }
        }
  
        if (key === 'value') {
          // store value as _value as well since
          // non-string values will be stringified
          elm._value = cur;
          // avoid resetting cursor position when value is the same
          var strCur = isUndef(cur) ? '' : String(cur);
          if (shouldUpdateValue(elm, vnode, strCur)) {
            elm.value = strCur;
          }
        } else {
          elm[key] = cur;
        }
      }
    }
  
    // check platforms/web/util/attrs.js acceptValue
  
  
    function shouldUpdateValue (
      elm,
      vnode,
      checkVal
    ) {
      return (!elm.composing && (
        vnode.tag === 'option' ||
        isDirty(elm, checkVal) ||
        isInputChanged(elm, checkVal)
      ))
    }
  
    function isDirty (elm, checkVal) {
      // return true when textbox (.number and .trim) loses focus and its value is not equal to the updated value
      return document.activeElement !== elm && elm.value !== checkVal
    }
  
    function isInputChanged (elm, newVal) {
      var value = elm.value;
      var modifiers = elm._vModifiers; // injected by v-model runtime
      if ((isDef(modifiers) && modifiers.number) || elm.type === 'number') {
        return toNumber(value) !== toNumber(newVal)
      }
      if (isDef(modifiers) && modifiers.trim) {
        return value.trim() !== newVal.trim()
      }
      return value !== newVal
    }
  
    var domProps = {
      create: updateDOMProps,
      update: updateDOMProps
    };
  
    /*  */
  
    var parseStyleText = cached(function (cssText) {
      var res = {};
      var listDelimiter = /;(?![^(]*\))/g;
      var propertyDelimiter = /:(.+)/;
      cssText.split(listDelimiter).forEach(function (item) {
        if (item) {
          var tmp = item.split(propertyDelimiter);
          tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
        }
      });
      return res
    });
  
    // merge static and dynamic style data on the same vnode
    function normalizeStyleData (data) {
      var style = normalizeStyleBinding(data.style);
      // static style is pre-processed into an object during compilation
      // and is always a fresh object, so it's safe to merge into it
      return data.staticStyle
        ? extend(data.staticStyle, style)
        : style
    }
  
    // normalize possible array / string values into Object
    function normalizeStyleBinding (bindingStyle) {
      if (Array.isArray(bindingStyle)) {
        return toObject(bindingStyle)
      }
      if (typeof bindingStyle === 'string') {
        return parseStyleText(bindingStyle)
      }
      return bindingStyle
    }
  
    /**
     * parent component style should be after child's
     * so that parent component's style could override it
     */
    function getStyle (vnode, checkChild) {
      var res = {};
      var styleData;
  
      if (checkChild) {
        var childNode = vnode;
        while (childNode.componentInstance) {
          childNode = childNode.componentInstance._vnode;
          if (childNode.data && (styleData = normalizeStyleData(childNode.data))) {
            extend(res, styleData);
          }
        }
      }
  
      if ((styleData = normalizeStyleData(vnode.data))) {
        extend(res, styleData);
      }
  
      var parentNode = vnode;
      while ((parentNode = parentNode.parent)) {
        if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
          extend(res, styleData);
        }
      }
      return res
    }
  
    /*  */
  
    var cssVarRE = /^--/;
    var importantRE = /\s*!important$/;
    var setProp = function (el, name, val) {
      /* istanbul ignore if */
      if (cssVarRE.test(name)) {
        el.style.setProperty(name, val);
      } else if (importantRE.test(val)) {
        el.style.setProperty(name, val.replace(importantRE, ''), 'important');
      } else {
        var normalizedName = normalize(name);
        if (Array.isArray(val)) {
          // Support values array created by autoprefixer, e.g.
          // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
          // Set them one by one, and the browser will only set those it can recognize
          for (var i = 0, len = val.length; i < len; i++) {
            el.style[normalizedName] = val[i];
          }
        } else {
          el.style[normalizedName] = val;
        }
      }
    };
  
    var prefixes = ['Webkit', 'Moz', 'ms'];
  
    var testEl;
    var normalize = cached(function (prop) {
      testEl = testEl || document.createElement('div');
      prop = camelize(prop);
      if (prop !== 'filter' && (prop in testEl.style)) {
        return prop
      }
      var upper = prop.charAt(0).toUpperCase() + prop.slice(1);
      for (var i = 0; i < prefixes.length; i++) {
        var prefixed = prefixes[i] + upper;
        if (prefixed in testEl.style) {
          return prefixed
        }
      }
    });
  
    function updateStyle (oldVnode, vnode) {
      var data = vnode.data;
      var oldData = oldVnode.data;
  
      if (isUndef(data.staticStyle) && isUndef(data.style) &&
        isUndef(oldData.staticStyle) && isUndef(oldData.style)
      ) {
        return
      }
  
      var cur, name;
      var el = vnode.elm;
      var oldStaticStyle = oldData.staticStyle;
      var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};
  
      // if static style exists, stylebinding already merged into it when doing normalizeStyleData
      var oldStyle = oldStaticStyle || oldStyleBinding;
  
      var style = normalizeStyleBinding(vnode.data.style) || {};
  
      // store normalized style under a different key for next diff
      // make sure to clone it if it's reactive, since the user likley wants
      // to mutate it.
      vnode.data.normalizedStyle = isDef(style.__ob__)
        ? extend({}, style)
        : style;
  
      var newStyle = getStyle(vnode, true);
  
      for (name in oldStyle) {
        if (isUndef(newStyle[name])) {
          setProp(el, name, '');
        }
      }
      for (name in newStyle) {
        cur = newStyle[name];
        if (cur !== oldStyle[name]) {
          // ie9 setting to null has no effect, must use empty string
          setProp(el, name, cur == null ? '' : cur);
        }
      }
    }
  
    var style = {
      create: updateStyle,
      update: updateStyle
    };
  
    /*  */
  
    /**
     * Add class with compatibility for SVG since classList is not supported on
     * SVG elements in IE
     */
    function addClass (el, cls) {
      /* istanbul ignore if */
      if (!cls || !(cls = cls.trim())) {
        return
      }
  
      /* istanbul ignore else */
      if (el.classList) {
        if (cls.indexOf(' ') > -1) {
          cls.split(/\s+/).forEach(function (c) { return el.classList.add(c); });
        } else {
          el.classList.add(cls);
        }
      } else {
        var cur = " " + (el.getAttribute('class') || '') + " ";
        if (cur.indexOf(' ' + cls + ' ') < 0) {
          el.setAttribute('class', (cur + cls).trim());
        }
      }
    }
  
    /**
     * Remove class with compatibility for SVG since classList is not supported on
     * SVG elements in IE
     */
    function removeClass (el, cls) {
      /* istanbul ignore if */
      if (!cls || !(cls = cls.trim())) {
        return
      }
  
      /* istanbul ignore else */
      if (el.classList) {
        if (cls.indexOf(' ') > -1) {
          cls.split(/\s+/).forEach(function (c) { return el.classList.remove(c); });
        } else {
          el.classList.remove(cls);
        }
      } else {
        var cur = " " + (el.getAttribute('class') || '') + " ";
        var tar = ' ' + cls + ' ';
        while (cur.indexOf(tar) >= 0) {
          cur = cur.replace(tar, ' ');
        }
        el.setAttribute('class', cur.trim());
      }
    }
  
    /*  */
  
    function resolveTransition (def$$1) {
      if (!def$$1) {
        return
      }
      /* istanbul ignore else */
      if (typeof def$$1 === 'object') {
        var res = {};
        if (def$$1.css !== false) {
          extend(res, autoCssTransition(def$$1.name || 'v'));
        }
        extend(res, def$$1);
        return res
      } else if (typeof def$$1 === 'string') {
        return autoCssTransition(def$$1)
      }
    }
  
    var autoCssTransition = cached(function (name) {
      return {
        enterClass: (name + "-enter"),
        enterToClass: (name + "-enter-to"),
        enterActiveClass: (name + "-enter-active"),
        leaveClass: (name + "-leave"),
        leaveToClass: (name + "-leave-to"),
        leaveActiveClass: (name + "-leave-active")
      }
    });
  
    var hasTransition = inBrowser && !isIE9;
    var TRANSITION = 'transition';
    var ANIMATION = 'animation';
  
    // Transition property/event sniffing
    var transitionProp = 'transition';
    var transitionEndEvent = 'transitionend';
    var animationProp = 'animation';
    var animationEndEvent = 'animationend';
    if (hasTransition) {
      /* istanbul ignore if */
      if (window.ontransitionend === undefined &&
        window.onwebkittransitionend !== undefined
      ) {
        transitionProp = 'WebkitTransition';
        transitionEndEvent = 'webkitTransitionEnd';
      }
      if (window.onanimationend === undefined &&
        window.onwebkitanimationend !== undefined
      ) {
        animationProp = 'WebkitAnimation';
        animationEndEvent = 'webkitAnimationEnd';
      }
    }
  
    // binding to window is necessary to make hot reload work in IE in strict mode
    var raf = inBrowser && window.requestAnimationFrame
      ? window.requestAnimationFrame.bind(window)
      : setTimeout;
  
    function nextFrame (fn) {
      raf(function () {
        raf(fn);
      });
    }
  
    function addTransitionClass (el, cls) {
      (el._transitionClasses || (el._transitionClasses = [])).push(cls);
      addClass(el, cls);
    }
  
    function removeTransitionClass (el, cls) {
      if (el._transitionClasses) {
        remove(el._transitionClasses, cls);
      }
      removeClass(el, cls);
    }
  
    function whenTransitionEnds (
      el,
      expectedType,
      cb
    ) {
      var ref = getTransitionInfo(el, expectedType);
      var type = ref.type;
      var timeout = ref.timeout;
      var propCount = ref.propCount;
      if (!type) { return cb() }
      var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
      var ended = 0;
      var end = function () {
        el.removeEventListener(event, onEnd);
        cb();
      };
      var onEnd = function (e) {
        if (e.target === el) {
          if (++ended >= propCount) {
            end();
          }
        }
      };
      setTimeout(function () {
        if (ended < propCount) {
          end();
        }
      }, timeout + 1);
      el.addEventListener(event, onEnd);
    }
  
    var transformRE = /\b(transform|all)(,|$)/;
  
    function getTransitionInfo (el, expectedType) {
      var styles = window.getComputedStyle(el);
      var transitionDelays = styles[transitionProp + 'Delay'].split(', ');
      var transitionDurations = styles[transitionProp + 'Duration'].split(', ');
      var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
      var animationDelays = styles[animationProp + 'Delay'].split(', ');
      var animationDurations = styles[animationProp + 'Duration'].split(', ');
      var animationTimeout = getTimeout(animationDelays, animationDurations);
  
      var type;
      var timeout = 0;
      var propCount = 0;
      /* istanbul ignore if */
      if (expectedType === TRANSITION) {
        if (transitionTimeout > 0) {
          type = TRANSITION;
          timeout = transitionTimeout;
          propCount = transitionDurations.length;
        }
      } else if (expectedType === ANIMATION) {
        if (animationTimeout > 0) {
          type = ANIMATION;
          timeout = animationTimeout;
          propCount = animationDurations.length;
        }
      } else {
        timeout = Math.max(transitionTimeout, animationTimeout);
        type = timeout > 0
          ? transitionTimeout > animationTimeout
            ? TRANSITION
            : ANIMATION
          : null;
        propCount = type
          ? type === TRANSITION
            ? transitionDurations.length
            : animationDurations.length
          : 0;
      }
      var hasTransform =
        type === TRANSITION &&
        transformRE.test(styles[transitionProp + 'Property']);
      return {
        type: type,
        timeout: timeout,
        propCount: propCount,
        hasTransform: hasTransform
      }
    }
  
    function getTimeout (delays, durations) {
      /* istanbul ignore next */
      while (delays.length < durations.length) {
        delays = delays.concat(delays);
      }
  
      return Math.max.apply(null, durations.map(function (d, i) {
        return toMs(d) + toMs(delays[i])
      }))
    }
  
    function toMs (s) {
      return Number(s.slice(0, -1)) * 1000
    }
  
    /*  */
  
    function enter (vnode, toggleDisplay) {
      var el = vnode.elm;
  
      // call leave callback now
      if (isDef(el._leaveCb)) {
        el._leaveCb.cancelled = true;
        el._leaveCb();
      }
  
      var data = resolveTransition(vnode.data.transition);
      if (isUndef(data)) {
        return
      }
  
      /* istanbul ignore if */
      if (isDef(el._enterCb) || el.nodeType !== 1) {
        return
      }
  
      var css = data.css;
      var type = data.type;
      var enterClass = data.enterClass;
      var enterToClass = data.enterToClass;
      var enterActiveClass = data.enterActiveClass;
      var appearClass = data.appearClass;
      var appearToClass = data.appearToClass;
      var appearActiveClass = data.appearActiveClass;
      var beforeEnter = data.beforeEnter;
      var enter = data.enter;
      var afterEnter = data.afterEnter;
      var enterCancelled = data.enterCancelled;
      var beforeAppear = data.beforeAppear;
      var appear = data.appear;
      var afterAppear = data.afterAppear;
      var appearCancelled = data.appearCancelled;
      var duration = data.duration;
  
      // activeInstance will always be the <transition> component managing this
      // transition. One edge case to check is when the <transition> is placed
      // as the root node of a child component. In that case we need to check
      // <transition>'s parent for appear check.
      var context = activeInstance;
      var transitionNode = activeInstance.$vnode;
      while (transitionNode && transitionNode.parent) {
        transitionNode = transitionNode.parent;
        context = transitionNode.context;
      }
  
      var isAppear = !context._isMounted || !vnode.isRootInsert;
  
      if (isAppear && !appear && appear !== '') {
        return
      }
  
      var startClass = isAppear && appearClass
        ? appearClass
        : enterClass;
      var activeClass = isAppear && appearActiveClass
        ? appearActiveClass
        : enterActiveClass;
      var toClass = isAppear && appearToClass
        ? appearToClass
        : enterToClass;
  
      var beforeEnterHook = isAppear
        ? (beforeAppear || beforeEnter)
        : beforeEnter;
      var enterHook = isAppear
        ? (typeof appear === 'function' ? appear : enter)
        : enter;
      var afterEnterHook = isAppear
        ? (afterAppear || afterEnter)
        : afterEnter;
      var enterCancelledHook = isAppear
        ? (appearCancelled || enterCancelled)
        : enterCancelled;
  
      var explicitEnterDuration = toNumber(
        isObject(duration)
          ? duration.enter
          : duration
      );
  
      if ("production" !== 'production' && explicitEnterDuration != null) {}
  
      var expectsCSS = css !== false && !isIE9;
      var userWantsControl = getHookArgumentsLength(enterHook);
  
      var cb = el._enterCb = once(function () {
        if (expectsCSS) {
          removeTransitionClass(el, toClass);
          removeTransitionClass(el, activeClass);
        }
        if (cb.cancelled) {
          if (expectsCSS) {
            removeTransitionClass(el, startClass);
          }
          enterCancelledHook && enterCancelledHook(el);
        } else {
          afterEnterHook && afterEnterHook(el);
        }
        el._enterCb = null;
      });
  
      if (!vnode.data.show) {
        // remove pending leave element on enter by injecting an insert hook
        mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'insert', function () {
          var parent = el.parentNode;
          var pendingNode = parent && parent._pending && parent._pending[vnode.key];
          if (pendingNode &&
            pendingNode.tag === vnode.tag &&
            pendingNode.elm._leaveCb
          ) {
            pendingNode.elm._leaveCb();
          }
          enterHook && enterHook(el, cb);
        });
      }
  
      // start enter transition
      beforeEnterHook && beforeEnterHook(el);
      if (expectsCSS) {
        addTransitionClass(el, startClass);
        addTransitionClass(el, activeClass);
        nextFrame(function () {
          addTransitionClass(el, toClass);
          removeTransitionClass(el, startClass);
          if (!cb.cancelled && !userWantsControl) {
            if (isValidDuration(explicitEnterDuration)) {
              setTimeout(cb, explicitEnterDuration);
            } else {
              whenTransitionEnds(el, type, cb);
            }
          }
        });
      }
  
      if (vnode.data.show) {
        toggleDisplay && toggleDisplay();
        enterHook && enterHook(el, cb);
      }
  
      if (!expectsCSS && !userWantsControl) {
        cb();
      }
    }
  
    function leave (vnode, rm) {
      var el = vnode.elm;
  
      // call enter callback now
      if (isDef(el._enterCb)) {
        el._enterCb.cancelled = true;
        el._enterCb();
      }
  
      var data = resolveTransition(vnode.data.transition);
      if (isUndef(data)) {
        return rm()
      }
  
      /* istanbul ignore if */
      if (isDef(el._leaveCb) || el.nodeType !== 1) {
        return
      }
  
      var css = data.css;
      var type = data.type;
      var leaveClass = data.leaveClass;
      var leaveToClass = data.leaveToClass;
      var leaveActiveClass = data.leaveActiveClass;
      var beforeLeave = data.beforeLeave;
      var leave = data.leave;
      var afterLeave = data.afterLeave;
      var leaveCancelled = data.leaveCancelled;
      var delayLeave = data.delayLeave;
      var duration = data.duration;
  
      var expectsCSS = css !== false && !isIE9;
      var userWantsControl = getHookArgumentsLength(leave);
  
      var explicitLeaveDuration = toNumber(
        isObject(duration)
          ? duration.leave
          : duration
      );
  
      if ("production" !== 'production' && isDef(explicitLeaveDuration)) {}
  
      var cb = el._leaveCb = once(function () {
        if (el.parentNode && el.parentNode._pending) {
          el.parentNode._pending[vnode.key] = null;
        }
        if (expectsCSS) {
          removeTransitionClass(el, leaveToClass);
          removeTransitionClass(el, leaveActiveClass);
        }
        if (cb.cancelled) {
          if (expectsCSS) {
            removeTransitionClass(el, leaveClass);
          }
          leaveCancelled && leaveCancelled(el);
        } else {
          rm();
          afterLeave && afterLeave(el);
        }
        el._leaveCb = null;
      });
  
      if (delayLeave) {
        delayLeave(performLeave);
      } else {
        performLeave();
      }
  
      function performLeave () {
        // the delayed leave may have already been cancelled
        if (cb.cancelled) {
          return
        }
        // record leaving element
        if (!vnode.data.show) {
          (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
        }
        beforeLeave && beforeLeave(el);
        if (expectsCSS) {
          addTransitionClass(el, leaveClass);
          addTransitionClass(el, leaveActiveClass);
          nextFrame(function () {
            addTransitionClass(el, leaveToClass);
            removeTransitionClass(el, leaveClass);
            if (!cb.cancelled && !userWantsControl) {
              if (isValidDuration(explicitLeaveDuration)) {
                setTimeout(cb, explicitLeaveDuration);
              } else {
                whenTransitionEnds(el, type, cb);
              }
            }
          });
        }
        leave && leave(el, cb);
        if (!expectsCSS && !userWantsControl) {
          cb();
        }
      }
    }
  
    function isValidDuration (val) {
      return typeof val === 'number' && !isNaN(val)
    }
  
    /**
     * Normalize a transition hook's argument length. The hook may be:
     * - a merged hook (invoker) with the original in .fns
     * - a wrapped component method (check ._length)
     * - a plain function (.length)
     */
    function getHookArgumentsLength (fn) {
      if (isUndef(fn)) {
        return false
      }
      var invokerFns = fn.fns;
      if (isDef(invokerFns)) {
        // invoker
        return getHookArgumentsLength(
          Array.isArray(invokerFns)
            ? invokerFns[0]
            : invokerFns
        )
      } else {
        return (fn._length || fn.length) > 1
      }
    }
  
    function _enter (_, vnode) {
      if (vnode.data.show !== true) {
        enter(vnode);
      }
    }
  
    var transition = inBrowser ? {
      create: _enter,
      activate: _enter,
      remove: function remove$$1 (vnode, rm) {
        /* istanbul ignore else */
        if (vnode.data.show !== true) {
          leave(vnode, rm);
        } else {
          rm();
        }
      }
    } : {};
  
    var platformModules = [
      attrs,
      klass,
      events,
      domProps,
      style,
      transition
    ];
  
    /*  */
  
    // the directive module should be applied last, after all
    // built-in modules have been applied.
    var modules = platformModules.concat(baseModules);
  
    var patch = createPatchFunction({ nodeOps: nodeOps, modules: modules });
  
    /**
     * Not type checking this file because flow doesn't like attaching
     * properties to Elements.
     */
  
    /* istanbul ignore if */
    if (isIE9) {
      // http://www.matts411.com/post/internet-explorer-9-oninput/
      document.addEventListener('selectionchange', function () {
        var el = document.activeElement;
        if (el && el.vmodel) {
          trigger(el, 'input');
        }
      });
    }
  
    var model$1 = {
      inserted: function inserted (el, binding, vnode) {
        if (vnode.tag === 'select') {
          var cb = function () {
            setSelected(el, binding, vnode.context);
          };
          cb();
          /* istanbul ignore if */
          if (isIE || isEdge) {
            setTimeout(cb, 0);
          }
        } else if (vnode.tag === 'textarea' || el.type === 'text' || el.type === 'password') {
          el._vModifiers = binding.modifiers;
          if (!binding.modifiers.lazy) {
            // Safari < 10.2 & UIWebView doesn't fire compositionend when
            // switching focus before confirming composition choice
            // this also fixes the issue where some browsers e.g. iOS Chrome
            // fires "change" instead of "input" on autocomplete.
            el.addEventListener('change', onCompositionEnd);
            if (!isAndroid) {
              el.addEventListener('compositionstart', onCompositionStart);
              el.addEventListener('compositionend', onCompositionEnd);
            }
            /* istanbul ignore if */
            if (isIE9) {
              el.vmodel = true;
            }
          }
        }
      },
      componentUpdated: function componentUpdated (el, binding, vnode) {
        if (vnode.tag === 'select') {
          setSelected(el, binding, vnode.context);
          // in case the options rendered by v-for have changed,
          // it's possible that the value is out-of-sync with the rendered options.
          // detect such cases and filter out values that no longer has a matching
          // option in the DOM.
          var needReset = el.multiple
            ? binding.value.some(function (v) { return hasNoMatchingOption(v, el.options); })
            : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, el.options);
          if (needReset) {
            trigger(el, 'change');
          }
        }
      }
    };
  
    function setSelected (el, binding, vm) {
      var value = binding.value;
      var isMultiple = el.multiple;
      if (isMultiple && !Array.isArray(value)) {
        "production" !== 'production' && warn$1(
          "<select multiple v-model=\"" + (binding.expression) + "\"> " +
          "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
          vm
        );
        return
      }
      var selected, option;
      for (var i = 0, l = el.options.length; i < l; i++) {
        option = el.options[i];
        if (isMultiple) {
          selected = looseIndexOf(value, getValue(option)) > -1;
          if (option.selected !== selected) {
            option.selected = selected;
          }
        } else {
          if (looseEqual(getValue(option), value)) {
            if (el.selectedIndex !== i) {
              el.selectedIndex = i;
            }
            return
          }
        }
      }
      if (!isMultiple) {
        el.selectedIndex = -1;
      }
    }
  
    function hasNoMatchingOption (value, options) {
      for (var i = 0, l = options.length; i < l; i++) {
        if (looseEqual(getValue(options[i]), value)) {
          return false
        }
      }
      return true
    }
  
    function getValue (option) {
      return '_value' in option
        ? option._value
        : option.value
    }
  
    function onCompositionStart (e) {
      e.target.composing = true;
    }
  
    function onCompositionEnd (e) {
      // prevent triggering an input event for no reason
      if (!e.target.composing) { return }
      e.target.composing = false;
      trigger(e.target, 'input');
    }
  
    function trigger (el, type) {
      var e = document.createEvent('HTMLEvents');
      e.initEvent(type, true, true);
      el.dispatchEvent(e);
    }
  
    /*  */
  
    // recursively search for possible transition defined inside the component root
    function locateNode (vnode) {
      return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
        ? locateNode(vnode.componentInstance._vnode)
        : vnode
    }
  
    var show = {
      bind: function bind (el, ref, vnode) {
        var value = ref.value;
  
        vnode = locateNode(vnode);
        var transition = vnode.data && vnode.data.transition;
        var originalDisplay = el.__vOriginalDisplay =
          el.style.display === 'none' ? '' : el.style.display;
        if (value && transition && !isIE9) {
          vnode.data.show = true;
          enter(vnode, function () {
            el.style.display = originalDisplay;
          });
        } else {
          el.style.display = value ? originalDisplay : 'none';
        }
      },
  
      update: function update (el, ref, vnode) {
        var value = ref.value;
        var oldValue = ref.oldValue;
  
        /* istanbul ignore if */
        if (value === oldValue) { return }
        vnode = locateNode(vnode);
        var transition = vnode.data && vnode.data.transition;
        if (transition && !isIE9) {
          vnode.data.show = true;
          if (value) {
            enter(vnode, function () {
              el.style.display = el.__vOriginalDisplay;
            });
          } else {
            leave(vnode, function () {
              el.style.display = 'none';
            });
          }
        } else {
          el.style.display = value ? el.__vOriginalDisplay : 'none';
        }
      },
  
      unbind: function unbind (
        el,
        binding,
        vnode,
        oldVnode,
        isDestroy
      ) {
        if (!isDestroy) {
          el.style.display = el.__vOriginalDisplay;
        }
      }
    };
  
    var platformDirectives = {
      model: model$1,
      show: show
    };
  
    /*  */
  
    // Provides transition support for a single element/component.
    // supports transition mode (out-in / in-out)
  
    var transitionProps = {
      name: String,
      appear: Boolean,
      css: Boolean,
      mode: String,
      type: String,
      enterClass: String,
      leaveClass: String,
      enterToClass: String,
      leaveToClass: String,
      enterActiveClass: String,
      leaveActiveClass: String,
      appearClass: String,
      appearActiveClass: String,
      appearToClass: String,
      duration: [Number, String, Object]
    };
  
    // in case the child is also an abstract component, e.g. <keep-alive>
    // we want to recursively retrieve the real component to be rendered
    function getRealChild (vnode) {
      var compOptions = vnode && vnode.componentOptions;
      if (compOptions && compOptions.Ctor.options.abstract) {
        return getRealChild(getFirstComponentChild(compOptions.children))
      } else {
        return vnode
      }
    }
  
    function extractTransitionData (comp) {
      var data = {};
      var options = comp.$options;
      // props
      for (var key in options.propsData) {
        data[key] = comp[key];
      }
      // events.
      // extract listeners and pass them directly to the transition methods
      var listeners = options._parentListeners;
      for (var key$1 in listeners) {
        data[camelize(key$1)] = listeners[key$1];
      }
      return data
    }
  
    function placeholder (h, rawChild) {
      if (/\d-keep-alive$/.test(rawChild.tag)) {
        return h('keep-alive', {
          props: rawChild.componentOptions.propsData
        })
      }
    }
  
    function hasParentTransition (vnode) {
      while ((vnode = vnode.parent)) {
        if (vnode.data.transition) {
          return true
        }
      }
    }
  
    function isSameChild (child, oldChild) {
      return oldChild.key === child.key && oldChild.tag === child.tag
    }
  
    var Transition = {
      name: 'transition',
      props: transitionProps,
      abstract: true,
  
      render: function render (h) {
        var this$1 = this;
  
        var children = this.$slots.default;
        if (!children) {
          return
        }
  
        // filter out text nodes (possible whitespaces)
        children = children.filter(function (c) { return c.tag; });
        /* istanbul ignore if */
        if (!children.length) {
          return
        }
  
        // warn multiple elements
        if ("production" !== 'production' && children.length > 1) {}
  
        var mode = this.mode;
  
        // warn invalid mode
        if ("production" !== 'production' &&
          mode && mode !== 'in-out' && mode !== 'out-in'
        ) {}
  
        var rawChild = children[0];
  
        // if this is a component root node and the component's
        // parent container node also has transition, skip.
        if (hasParentTransition(this.$vnode)) {
          return rawChild
        }
  
        // apply transition data to child
        // use getRealChild() to ignore abstract components e.g. keep-alive
        var child = getRealChild(rawChild);
        /* istanbul ignore if */
        if (!child) {
          return rawChild
        }
  
        if (this._leaving) {
          return placeholder(h, rawChild)
        }
  
        // ensure a key that is unique to the vnode type and to this transition
        // component instance. This key will be used to remove pending leaving nodes
        // during entering.
        var id = "__transition-" + (this._uid) + "-";
        child.key = child.key == null
          ? id + child.tag
          : isPrimitive(child.key)
            ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
            : child.key;
  
        var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
        var oldRawChild = this._vnode;
        var oldChild = getRealChild(oldRawChild);
  
        // mark v-show
        // so that the transition module can hand over the control to the directive
        if (child.data.directives && child.data.directives.some(function (d) { return d.name === 'show'; })) {
          child.data.show = true;
        }
  
        if (oldChild && oldChild.data && !isSameChild(child, oldChild)) {
          // replace old child transition data with fresh one
          // important for dynamic transitions!
          var oldData = oldChild && (oldChild.data.transition = extend({}, data));
          // handle transition mode
          if (mode === 'out-in') {
            // return placeholder node and queue update when leave finishes
            this._leaving = true;
            mergeVNodeHook(oldData, 'afterLeave', function () {
              this$1._leaving = false;
              this$1.$forceUpdate();
            });
            return placeholder(h, rawChild)
          } else if (mode === 'in-out') {
            var delayedLeave;
            var performLeave = function () { delayedLeave(); };
            mergeVNodeHook(data, 'afterEnter', performLeave);
            mergeVNodeHook(data, 'enterCancelled', performLeave);
            mergeVNodeHook(oldData, 'delayLeave', function (leave) { delayedLeave = leave; });
          }
        }
  
        return rawChild
      }
    };
  
    /*  */
  
    // Provides transition support for list items.
    // supports move transitions using the FLIP technique.
  
    // Because the vdom's children update algorithm is "unstable" - i.e.
    // it doesn't guarantee the relative positioning of removed elements,
    // we force transition-group to update its children into two passes:
    // in the first pass, we remove all nodes that need to be removed,
    // triggering their leaving transition; in the second pass, we insert/move
    // into the final desired state. This way in the second pass removed
    // nodes will remain where they should be.
  
    var props = extend({
      tag: String,
      moveClass: String
    }, transitionProps);
  
    delete props.mode;
  
    var TransitionGroup = {
      props: props,
  
      render: function render (h) {
        var tag = this.tag || this.$vnode.data.tag || 'span';
        var map = Object.create(null);
        var prevChildren = this.prevChildren = this.children;
        var rawChildren = this.$slots.default || [];
        var children = this.children = [];
        var transitionData = extractTransitionData(this);
  
        for (var i = 0; i < rawChildren.length; i++) {
          var c = rawChildren[i];
          if (c.tag) {
            if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
              children.push(c);
              map[c.key] = c
              ;(c.data || (c.data = {})).transition = transitionData;
            } else if ("production" !== 'production') {}
          }
        }
  
        if (prevChildren) {
          var kept = [];
          var removed = [];
          for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
            var c$1 = prevChildren[i$1];
            c$1.data.transition = transitionData;
            c$1.data.pos = c$1.elm.getBoundingClientRect();
            if (map[c$1.key]) {
              kept.push(c$1);
            } else {
              removed.push(c$1);
            }
          }
          this.kept = h(tag, null, kept);
          this.removed = removed;
        }
  
        return h(tag, null, children)
      },
  
      beforeUpdate: function beforeUpdate () {
        // force removing pass
        this.__patch__(
          this._vnode,
          this.kept,
          false, // hydrating
          true // removeOnly (!important, avoids unnecessary moves)
        );
        this._vnode = this.kept;
      },
  
      updated: function updated () {
        var children = this.prevChildren;
        var moveClass = this.moveClass || ((this.name || 'v') + '-move');
        if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
          return
        }
  
        // we divide the work into three loops to avoid mixing DOM reads and writes
        // in each iteration - which helps prevent layout thrashing.
        children.forEach(callPendingCbs);
        children.forEach(recordPosition);
        children.forEach(applyTranslation);
  
        // force reflow to put everything in position
        var body = document.body;
        var f = body.offsetHeight; // eslint-disable-line
  
        children.forEach(function (c) {
          if (c.data.moved) {
            var el = c.elm;
            var s = el.style;
            addTransitionClass(el, moveClass);
            s.transform = s.WebkitTransform = s.transitionDuration = '';
            el.addEventListener(transitionEndEvent, el._moveCb = function cb (e) {
              if (!e || /transform$/.test(e.propertyName)) {
                el.removeEventListener(transitionEndEvent, cb);
                el._moveCb = null;
                removeTransitionClass(el, moveClass);
              }
            });
          }
        });
      },
  
      methods: {
        hasMove: function hasMove (el, moveClass) {
          /* istanbul ignore if */
          if (!hasTransition) {
            return false
          }
          if (this._hasMove != null) {
            return this._hasMove
          }
          // Detect whether an element with the move class applied has
          // CSS transitions. Since the element may be inside an entering
          // transition at this very moment, we make a clone of it and remove
          // all other transition classes applied to ensure only the move class
          // is applied.
          var clone = el.cloneNode();
          if (el._transitionClasses) {
            el._transitionClasses.forEach(function (cls) { removeClass(clone, cls); });
          }
          addClass(clone, moveClass);
          clone.style.display = 'none';
          this.$el.appendChild(clone);
          var info = getTransitionInfo(clone);
          this.$el.removeChild(clone);
          return (this._hasMove = info.hasTransform)
        }
      }
    };
  
    function callPendingCbs (c) {
      /* istanbul ignore if */
      if (c.elm._moveCb) {
        c.elm._moveCb();
      }
      /* istanbul ignore if */
      if (c.elm._enterCb) {
        c.elm._enterCb();
      }
    }
  
    function recordPosition (c) {
      c.data.newPos = c.elm.getBoundingClientRect();
    }
  
    function applyTranslation (c) {
      var oldPos = c.data.pos;
      var newPos = c.data.newPos;
      var dx = oldPos.left - newPos.left;
      var dy = oldPos.top - newPos.top;
      if (dx || dy) {
        c.data.moved = true;
        var s = c.elm.style;
        s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
        s.transitionDuration = '0s';
      }
    }
  
    var platformComponents = {
      Transition: Transition,
      TransitionGroup: TransitionGroup
    };
  
    /*  */
  
    // install platform specific utils
    Vue$3.config.mustUseProp = mustUseProp;
    Vue$3.config.isReservedTag = isReservedTag;
    Vue$3.config.isReservedAttr = isReservedAttr;
    Vue$3.config.getTagNamespace = getTagNamespace;
    Vue$3.config.isUnknownElement = isUnknownElement;
  
    // install platform runtime directives & components
    extend(Vue$3.options.directives, platformDirectives);
    extend(Vue$3.options.components, platformComponents);
  
    // install platform patch function
    Vue$3.prototype.__patch__ = inBrowser ? patch : noop;
  
    // public mount method
    Vue$3.prototype.$mount = function (
      el,
      hydrating
    ) {
      el = el && inBrowser ? query(el) : undefined;
      return mountComponent(this, el, hydrating)
    };
  
    // devtools global hook
    /* istanbul ignore next */
    setTimeout(function () {
      if (config.devtools) {
        if (devtools) {
          devtools.emit('init', Vue$3);
        } else if ("production" !== 'production' && isChrome) {}
      }
      if ("production" !== 'production' &&
        config.productionTip !== false &&
        inBrowser && typeof console !== 'undefined'
      ) {}
    }, 0);
  
    var LEFT_ARROW = '«'
    var RIGHT_ARROW = '»'
    var ELLIPSES = '…'
  
    var LimitedLinksGenerator = function LimitedLinksGenerator (listOfPages, currentPage, limit) {
      this.listOfPages = listOfPages
      this.lastPage = listOfPages.length - 1
      this.currentPage = currentPage === this.lastPage
        ? this.lastPage - 1
        : currentPage
      this.limit = limit
    };
  
    LimitedLinksGenerator.prototype.generate = function generate () {
      var firstHalf = this._buildFirstHalf()
      var secondHalf = this._buildSecondHalf()
      return firstHalf.concat( secondHalf)
    };
  
    LimitedLinksGenerator.prototype._buildFirstHalf = function _buildFirstHalf () {
      var firstHalf = this._allPagesButLast()
        .slice(
          this._currentChunkIndex(),
          this._currentChunkIndex() + this.limit
        )
      // Add backward ellipses with first page if needed
      if (this.currentPage >= this.limit) {
        firstHalf.unshift(ELLIPSES)
        firstHalf.unshift(0)
      }
      // Add ellipses if needed
      if (this.lastPage - this.limit > this._currentChunkIndex()) {
        firstHalf.push(ELLIPSES)
      }
      return firstHalf
    };
  
    LimitedLinksGenerator.prototype._buildSecondHalf = function _buildSecondHalf () {
      var secondHalf = [this.lastPage]
      return secondHalf
    };
  
    LimitedLinksGenerator.prototype._currentChunkIndex = function _currentChunkIndex () {
      var currentChunk = Math.floor(this.currentPage / this.limit)
      return currentChunk * this.limit 
    };
  
    LimitedLinksGenerator.prototype._allPagesButLast = function _allPagesButLast () {
        var this$1 = this;
  
      return this.listOfPages.filter(function (n) { return n !== this$1.lastPage; })
    };
  
    var PaginateLinks = {
      name: 'paginate-links',
      props: {
        for: {
          type: String,
          required: true
        },
        limit: {
          type: Number,
          default: 0
        },
        simple: {
          type: Object,
          default: null,
          validator: function validator (obj) {
            return obj.prev && obj.next
          }
        },
        stepLinks: {
          type: Object,
          default: function () {
            return {
              prev: LEFT_ARROW,
              next: RIGHT_ARROW
            }
          },
          validator: function validator$1 (obj) {
            return obj.prev && obj.next
          }
        },
        showStepLinks: {
          type: Boolean
        },
        hideSinglePage: {
          type: Boolean
        },
        classes: {
          type: Object,
          default: null
        },
        async: {
          type: Boolean,
          default: false
        },
        partition: {
            type: Boolean,
            default: false
        },
        chunkStepLinks: {
          type: Object,
          default: function () {
              return {
                  prev: LEFT_ARROW,
                  next: RIGHT_ARROW
              }
          }
        }
      },
      data: function data () {
        return {
          listOfPages: [],
          numberOfPages: 0,
          target: null,
          startPage: 1
        }
      },
      computed: {
        currentPage: {
          get: function get () {
            if (this.$parent.paginate[this.for]) {
              return this.$parent.paginate[this.for].page
            }
          },
          set: function set (page) {
            this.$parent.paginate[this.for].page = page
          }
        }
      },
      mounted: function mounted () {
        var this$1 = this;
  
        if (this.simple && this.limit) {
          warn(("<paginate-links for=\"" + (this.for) + "\"> 'simple' and 'limit' props can't be used at the same time. In this case, 'simple' will take precedence, and 'limit' will be ignored."), this.$parent, 'warn')
        }
        if (this.simple && !this.simple.next) {
          warn(("<paginate-links for=\"" + (this.for) + "\"> 'simple' prop doesn't contain 'next' value."), this.$parent)
        }
        if (this.simple && !this.simple.prev) {
          warn(("<paginate-links for=\"" + (this.for) + "\"> 'simple' prop doesn't contain 'prev' value."), this.$parent)
        }
        if (this.stepLinks && !this.stepLinks.next) {
          warn(("<paginate-links for=\"" + (this.for) + "\"> 'step-links' prop doesn't contain 'next' value."), this.$parent)
        }
        if (this.stepLinks && !this.stepLinks.prev) {
          warn(("<paginate-links for=\"" + (this.for) + "\"> 'step-links' prop doesn't contain 'prev' value."), this.$parent)
        }
        Vue$3.nextTick(function () {
          this$1.updateListOfPages()
        })
      },
      watch: {
        '$parent.paginate': {
          handler: function handler () {
            this.updateListOfPages()
          },
          deep: true
        },
        currentPage: function currentPage (toPage, fromPage) {
          this.$emit('change', toPage + 1, fromPage + 1)
        },
        startPage: function startPage(state) {
          if (state > this.currentPage) {
              this.$emit('next', state)
          } else {
              this.$emit('prev', state)
          }
        }
      },
      methods: {
        updateListOfPages: function updateListOfPages () {
          this.target = getTargetPaginateComponent(this.$parent.$children, this.for)
          if (!this.target) {
            if (this.async) { return }
            warn(("<paginate-links for=\"" + (this.for) + "\"> can't be used without its companion <paginate name=\"" + (this.for) + "\">"), this.$parent)
            warn("To fix that issue you may need to use :async=\"true\" on <paginate-links> component to allow for asyncronous rendering", this.$parent, 'warn')
            return
          }
          this.numberOfPages = Math.ceil(this.target.list.length / this.target.per)
          this.listOfPages = getListOfPageNumbers(this.numberOfPages)
        }
      },
      render: function render (h) {
        var this$1 = this;
  
        if (!this.target && this.async) { return null }
  
          var links = this.simple
              ? getSimpleLinks(this, h)
              : this.partition
              ? getPartitionedLinks(this, h)
              : this.limit > 1
              ? getLimitedLinks(this, h)
              : getFullLinks(this, h)
  
        if (this.hideSinglePage && this.numberOfPages <= 1) {
          return null
        }
  
        var el = h('ul', {
          class: ['paginate-links', this.for]
        }, links)
  
        if (this.classes) {
          Vue$3.nextTick(function () {
            addAdditionalClasses(el.elm, this$1.classes)
          })
        }
        return el
      }
    }
  
    function getFullLinks (vm, h) {
      var allLinks = vm.showStepLinks
        ? [vm.stepLinks.prev ].concat( vm.listOfPages, [vm.stepLinks.next])
        : vm.listOfPages
      return allLinks.map(function (link) {
        var data = {
          on: {
            click: function (e) {
              e.preventDefault()
              vm.currentPage = getTargetPageForLink(
                link,
                vm.limit,
                vm.currentPage,
                vm.listOfPages,
                vm.stepLinks
              )
            }
          }
        }
        var liClasses = getClassesForLink(
          link,
          vm.currentPage,
          vm.listOfPages.length - 1,
          vm.stepLinks
        )
        var linkText = link === vm.stepLinks.next || link === vm.stepLinks.prev
          ? link
          : link + 1 // it means it's a number
        return h('li', { class: liClasses }, [h('a', data, linkText)])
      })
    }
  
    function getLimitedLinks (vm, h) {
      var limitedLinks = new LimitedLinksGenerator(
        vm.listOfPages,
        vm.currentPage,
        vm.limit,
        vm.stepLinks
      ).generate()
  
      limitedLinks = vm.showStepLinks
        ? [vm.stepLinks.prev ].concat( limitedLinks, [vm.stepLinks.next])
        : limitedLinks
  
      var limitedLinksMetadata = getLimitedLinksMetadata(limitedLinks)
  
      return limitedLinks.map(function (link, index) {
        var data = {
          on: {
            click: function (e) {
              e.preventDefault()
              vm.currentPage = getTargetPageForLink(
                link,
                vm.limit,
                vm.currentPage,
                vm.listOfPages,
                vm.stepLinks,
                limitedLinksMetadata[index]
              )
            }
          }
        }
        var liClasses = getClassesForLink(
          link,
          vm.currentPage,
          vm.listOfPages.length - 1,
          vm.stepLinks
        )
        // If the link is a number,
        // then incremented by 1 (since it's 0 based).
        // otherwise, do nothing (so, it's a symbol). 
        var text = Number.isInteger(link) ? link + 1 : link
        return h('li', { class: liClasses }, [h('a', data, text)])
      })
    }
  
    function getSimpleLinks (vm, h) {
      var lastPage = vm.listOfPages.length - 1
      var prevData = {
        on: {
          click: function (e) {
            e.preventDefault()
            if (vm.currentPage > 0) { vm.currentPage -= 1 }
          }
        }
      }
      var nextData = {
        on: {
          click: function (e) {
            e.preventDefault()
            if (vm.currentPage < lastPage) { vm.currentPage += 1 }
          }
        }
      }
      var nextListData = { class: ['next', vm.currentPage >= lastPage ? 'disabled' : ''] }
      var prevListData = { class: ['prev', vm.currentPage <= 0 ? 'disabled' : ''] }
      var prevLink = h('li', prevListData, [h('a', prevData, vm.simple.prev)])
      var nextLink = h('li', nextListData, [h('a', nextData, vm.simple.next)])
      return [prevLink, nextLink]
    }
  
    function getPartitionedLinks (vm, h) {
        var partitionedListOfPages = vm.listOfPages.map(function (it) { return it + vm.startPage; })
        var pageLinks = partitionedListOfPages.map(function (link) {
            var data = {
                on: {
                    click: function (e) {
                        e.preventDefault()
                        vm.currentPage = link - vm.startPage
  
                    }
                }
            }
  
            var liClass = ['number']
            if (link === (vm.currentPage + vm.startPage)) {
                liClass.push('active')
            }
  
            return h('li', {class: liClass}, [h('a', data, link)])
        })
  
        var prev = {
            on: {
                click: function (e) {
                    e.preventDefault();
                    var movedStartPage = (Math.floor((vm.startPage - 1) / vm.limit) - 1) * vm.limit
                    vm.startPage = movedStartPage < 1 ?  1 : (movedStartPage + 1)
                    vm.currentPage = vm.startPage <= 1 ? 0 : (Math.floor(vm.startPage / vm.limit) - 1)
                }
            }
        }
  
        var next = {}
        if(partitionedListOfPages.length > 0) {
            next = {
              on: {
                  click: function (e) {
                      e.preventDefault();
                      vm.startPage = (Math.floor((vm.startPage - 1) / vm.limit) + 1) * vm.limit + 1
                      vm.currentPage = Math.floor(vm.startPage / vm.limit) - 1
                  }
              }
          }
        }
  
        pageLinks.unshift(h('li', [h('a', prev, vm.chunkStepLinks.prev)]))
        pageLinks.push(h('li', [h('a', next, vm.chunkStepLinks.next)]))
        return pageLinks
    }
  
    function getTargetPaginateComponent (children, targetName) {
      return children
        .filter(function (child) { return (child.$vnode.componentOptions.tag === 'paginate'); })
        .find(function (child) { return child.name === targetName; })
    }
  
    function getListOfPageNumbers (numberOfPages) {
      // converts number of pages into an array
      // that contains each individual page number
      // For Example: 4 => [0, 1, 2, 3]
      return Array.apply(null, { length: numberOfPages })
        .map(function (val, index) { return index; })
    }
  
    function getClassesForLink(link, currentPage, lastPage, ref) {
      var prev = ref.prev;
      var next = ref.next;
  
      var liClass = []
      if (link === prev) {
        liClass.push('left-arrow')
      } else if (link === next) {
        liClass.push('right-arrow')
      } else if (link === ELLIPSES) {
        liClass.push('ellipses')
      } else {
        liClass.push('number')
      }
  
      if (link === currentPage) {
        liClass.push('active')
      }
  
      if (link === prev && currentPage <= 0) {
        liClass.push('disabled')
      } else if (link === next && currentPage >= lastPage) {
        liClass.push('disabled')
      }
      return liClass
    }
  
    function getTargetPageForLink (link, limit, currentPage, listOfPages, ref, metaData) {
      var prev = ref.prev;
      var next = ref.next;
      if ( metaData === void 0 ) metaData = null;
  
      var currentChunk = Math.floor(currentPage / limit)
      if (link === prev) {
        return (currentPage - 1) < 0 ? 0 : currentPage - 1
      } else if (link === next) {
        return (currentPage + 1 > listOfPages.length - 1)
          ? listOfPages.length - 1
          : currentPage + 1
      } else if (metaData && metaData === 'right-ellipses') {
        return (currentChunk + 1) * limit
      } else if (metaData && metaData === 'left-ellipses') {
        var chunkContent = listOfPages.slice(currentChunk * limit, currentChunk * limit + limit)
        var isLastPage = currentPage === listOfPages.length - 1
        if (isLastPage && chunkContent.length === 1) {
          currentChunk--
        }
        return (currentChunk - 1) * limit + limit - 1
      }
      // which is number
      return link
    }
  
    /**
     * Mainly used here to check whether the displayed
     * ellipses is for showing previous or next links
     */
    function getLimitedLinksMetadata (limitedLinks) {
      return limitedLinks.map(function (link, index) {
        if (link === ELLIPSES && limitedLinks[index - 1] === 0) {
          return 'left-ellipses'
        } else if (link === ELLIPSES && limitedLinks[index - 1] !== 0) {
          return 'right-ellipses'
        }
        return link
      })
    }
  
    function addAdditionalClasses (linksContainer, classes) {
      Object.keys(classes).forEach(function (selector) {
        if (selector === 'ul') {
          var selectorValue = classes['ul']
          if (Array.isArray(selectorValue)) {
            selectorValue.forEach(function (c) { return linksContainer.classList.add(c); })
          } else {
            linksContainer.classList.add(selectorValue)
          }
        }
        linksContainer.querySelectorAll(selector).forEach(function (node) {
          var selectorValue = classes[selector]
          if (Array.isArray(selectorValue)) {
            selectorValue.forEach(function (c) { return node.classList.add(c); })
          } else {
            node.classList.add(selectorValue)
          }
        })
      })
    }
  
    function paginateDataGenerator (listNames) {
      if ( listNames === void 0 ) listNames = [];
  
      return listNames.reduce(function (curr, listName) {
        curr[listName] = {
          list: [],
          page: 0
        }
        return curr
      }, {})
    }
  
    var vuePaginate = {}
  
    vuePaginate.install = function (Vue) {
      Vue.mixin({
        created: function created () {
          if (this.paginate !== 'undefined' && this.paginate instanceof Array) {
            this.paginate = paginateDataGenerator(this.paginate)
          }
        },
        methods: {
          paginated: function paginated (listName) {
            if (!this.paginate || !this.paginate[listName]) {
              warn(("'" + listName + "' is not registered in 'paginate' array."), this)
              return
            }
            return this.paginate[listName].list
          }
        }
      })
      Vue.component('paginate', Paginate)
      Vue.component('paginate-links', PaginateLinks)
    }
  
    if (typeof window !== 'undefined' && window.Vue) {
      window.Vue.use(vuePaginate)
    }
  
    return vuePaginate;
  
  }));