text: /**
   * Created by Administrator on 2017/5/16.
   */
  /*!
   * Vue.js v2.3.0
   * (c) 2014-2017 Evan You
   * Released under the MIT License.
   */
  (function (global, factory) {
      typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
          typeof define === 'function' && define.amd ? define(factory) :
              (global.Vue = factory());
  }(this, (function () { 'use strict';
  
      /*  */
  
  // 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
      }
  
      /**
       * 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.
       */
      function genStaticKeys (modules) {
          return modules.reduce(function (keys, m) {
              return keys.concat(m.staticKeys || [])
          }, []).join(',')
      }
  
      /**
       * 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: "development" !== 'production',
  
          /**
           * Whether to enable devtools
           */
          devtools: "development" !== '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 = noop;
      var tip = noop;
      var formatComponentName;
  
      {
          var hasConsole = typeof console !== 'undefined';
          var classifyRE = /(?:^|[-_])(\w)/g;
          var classify = function (str) { return str
              .replace(classifyRE, function (c) { return c.toUpperCase(); })
              .replace(/[-_]/g, ''); };
  
          warn = function (msg, vm) {
              if (hasConsole && (!config.silent)) {
                  console.error("[Vue warn]: " + msg + (
                          vm ? generateComponentTrace(vm) : ''
                      ));
              }
          };
  
          tip = function (msg, vm) {
              if (hasConsole && (!config.silent)) {
                  console.warn("[Vue tip]: " + msg + (
                          vm ? generateComponentTrace(vm) : ''
                      ));
              }
          };
  
          formatComponentName = function (vm, includeFile) {
              if (vm.$root === vm) {
                  return '<Root>'
              }
              var name = typeof vm === 'string'
                  ? vm
                  : typeof vm === 'function' && vm.options
                      ? vm.options.name
                      : vm._isVue
                          ? vm.$options.name || vm.$options._componentTag
                          : vm.name;
  
              var file = vm._isVue && vm.$options.__file;
              if (!name && file) {
                  var match = file.match(/([^/\\]+)\.vue$/);
                  name = match && match[1];
              }
  
              return (
                  (name ? ("<" + (classify(name)) + ">") : "<Anonymous>") +
                  (file && includeFile !== false ? (" at " + file) : '')
              )
          };
  
          var repeat = function (str, n) {
              var res = '';
              while (n) {
                  if (n % 2 === 1) { res += str; }
                  if (n > 1) { str += str; }
                  n >>= 1;
              }
              return res
          };
  
          var generateComponentTrace = function (vm) {
              if (vm._isVue && vm.$parent) {
                  var tree = [];
                  var currentRecursiveSequence = 0;
                  while (vm) {
                      if (tree.length > 0) {
                          var last = tree[tree.length - 1];
                          if (last.constructor === vm.constructor) {
                              currentRecursiveSequence++;
                              vm = vm.$parent;
                              continue
                          } else if (currentRecursiveSequence > 0) {
                              tree[tree.length - 1] = [last, currentRecursiveSequence];
                              currentRecursiveSequence = 0;
                          }
                      }
                      tree.push(vm);
                      vm = vm.$parent;
                  }
                  return '\n\nfound in\n\n' + tree
                          .map(function (vm, i) { return ("" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm)
                              ? ((formatComponentName(vm[0])) + "... (" + (vm[1]) + " recursive calls)")
                              : formatComponentName(vm))); })
                          .join('\n')
              } else {
                  return ("\n\n(found in " + (formatComponentName(vm)) + ")")
              }
          };
      }
  
      function handleError (err, vm, info) {
          if (config.errorHandler) {
              config.errorHandler.call(null, err, vm, info);
          } else {
              {
                  warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
              }
              /* 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 = 0;
  
      /**
       * A dep is an observable that can have multiple
       * directives subscribing to it.
       */
      var Dep = function Dep () {
          this.id = uid++;
          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 ("development" !== 'production' && customSetter) {
                      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)) {
              "development" !== 'production' && warn(
                  '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)) {
              "development" !== 'production' && warn(
                  '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;
  
      /**
       * Options with restrictions
       */
      {
          strats.el = strats.propsData = function (parent, child, vm, key) {
              if (!vm) {
                  warn(
                      "option \"" + key + "\" can only be used during instance " +
                      'creation with the `new` keyword.'
                  );
              }
              return defaultStrat(parent, child)
          };
      }
  
      /**
       * 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') {
                  "development" !== 'production' && warn(
                      '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
      };
  
      /**
       * Validate component names
       */
      function checkComponents (options) {
          for (var key in options.components) {
              var lower = key.toLowerCase();
              if (isBuiltInTag(lower) || config.isReservedTag(lower)) {
                  warn(
                      'Do not use built-in or reserved HTML elements as component ' +
                      'id: ' + key
                  );
              }
          }
      }
  
      /**
       * 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 {
                      warn('props must be strings when using array syntax.');
                  }
              }
          } 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
      ) {
          {
              checkComponents(child);
          }
  
          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 ("development" !== 'production' && warnMissing && !res) {
              warn(
                  'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
                  options
              );
          }
          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;
          }
          {
              assertProp(prop, key, value, vm, absent);
          }
          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 ("development" !== 'production' && isObject(def)) {
              warn(
                  'Invalid default value for prop "' + key + '": ' +
                  'Props with type Object/Array must use a factory function ' +
                  'to return the default value.',
                  vm
              );
          }
          // 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
      }
  
      /**
       * Assert whether a prop is valid.
       */
      function assertProp (
          prop,
          name,
          value,
          vm,
          absent
      ) {
          if (prop.required && absent) {
              warn(
                  'Missing required prop: "' + name + '"',
                  vm
              );
              return
          }
          if (value == null && !prop.required) {
              return
          }
          var type = prop.type;
          var valid = !type || type === true;
          var expectedTypes = [];
          if (type) {
              if (!Array.isArray(type)) {
                  type = [type];
              }
              for (var i = 0; i < type.length && !valid; i++) {
                  var assertedType = assertType(value, type[i]);
                  expectedTypes.push(assertedType.expectedType || '');
                  valid = assertedType.valid;
              }
          }
          if (!valid) {
              warn(
                  'Invalid prop: type check failed for prop "' + name + '".' +
                  ' Expected ' + expectedTypes.map(capitalize).join(', ') +
                  ', got ' + Object.prototype.toString.call(value).slice(8, -1) + '.',
                  vm
              );
              return
          }
          var validator = prop.validator;
          if (validator) {
              if (!validator(value)) {
                  warn(
                      'Invalid prop: custom validator check failed for prop "' + name + '".',
                      vm
                  );
              }
          }
      }
  
      var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/;
  
      function assertType (value, type) {
          var valid;
          var expectedType = getType(type);
          if (simpleCheckRE.test(expectedType)) {
              valid = typeof value === expectedType.toLowerCase();
          } else if (expectedType === 'Object') {
              valid = isPlainObject(value);
          } else if (expectedType === 'Array') {
              valid = Array.isArray(value);
          } else {
              valid = value instanceof type;
          }
          return {
              valid: valid,
              expectedType: expectedType
          }
      }
  
      /**
       * 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 measure;
  
      {
          var perf = inBrowser && window.performance;
          /* istanbul ignore if */
          if (
              perf &&
              perf.mark &&
              perf.measure &&
              perf.clearMarks &&
              perf.clearMeasures
          ) {
              mark = function (tag) { return perf.mark(tag); };
              measure = function (name, startTag, endTag) {
                  perf.measure(name, startTag, endTag);
                  perf.clearMarks(startTag);
                  perf.clearMarks(endTag);
                  perf.clearMeasures(name);
              };
          }
      }
  
      /* not type checking this file because flow doesn't play well with Proxy */
  
      var initProxy;
  
      {
          var allowedGlobals = makeMap(
              'Infinity,undefined,NaN,isFinite,isNaN,' +
              'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
              'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
              'require' // for Webpack/Browserify
          );
  
          var warnNonPresent = function (target, key) {
              warn(
                  "Property or method \"" + key + "\" is not defined on the instance but " +
                  "referenced during render. Make sure to declare reactive data " +
                  "properties in the data option.",
                  target
              );
          };
  
          var hasProxy =
              typeof Proxy !== 'undefined' &&
              Proxy.toString().match(/native code/);
  
          if (hasProxy) {
              var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta');
              config.keyCodes = new Proxy(config.keyCodes, {
                  set: function set (target, key, value) {
                      if (isBuiltInModifier(key)) {
                          warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
                          return false
                      } else {
                          target[key] = value;
                          return true
                      }
                  }
              });
          }
  
          var hasHandler = {
              has: function has (target, key) {
                  var has = key in target;
                  var isAllowed = allowedGlobals(key) || key.charAt(0) === '_';
                  if (!has && !isAllowed) {
                      warnNonPresent(target, key);
                  }
                  return has || !isAllowed
              }
          };
  
          var getHandler = {
              get: function get (target, key) {
                  if (typeof key === 'string' && !(key in target)) {
                      warnNonPresent(target, key);
                  }
                  return target[key]
              }
          };
  
          initProxy = function initProxy (vm) {
              if (hasProxy) {
                  // determine which proxy handler to use
                  var options = vm.$options;
                  var handlers = options.render && options.render._withStripped
                      ? getHandler
                      : hasHandler;
                  vm._renderProxy = new Proxy(vm, handlers);
              } else {
                  vm._renderProxy = vm;
              }
          };
      }
  
      /*  */
  
      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.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$$1,
          vm
      ) {
          var name, cur, old, event;
          for (name in on) {
              cur = on[name];
              old = oldOn[name];
              event = normalizeEvent(name);
              if (isUndef(cur)) {
                  "development" !== 'production' && warn(
                      "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
                      vm
                  );
              } else if (isUndef(old)) {
                  if (isUndef(cur.fns)) {
                      cur = on[name] = createFnInvoker(cur);
                  }
                  add(event.name, cur, event.once, event.capture, event.passive);
              } else if (cur !== old) {
                  old.fns = cur;
                  on[name] = old;
              }
          }
          for (name in oldOn) {
              if (isUndef(on[name])) {
                  event = normalizeEvent(name);
                  remove$$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);
                  {
                      var keyInLowerCase = key.toLowerCase();
                      if (
                          key !== keyInLowerCase &&
                          attrs && hasOwn(attrs, keyInLowerCase)
                      ) {
                          tip(
                              "Prop \"" + keyInLowerCase + "\" is passed to component " +
                              (formatComponentName(tag || Ctor)) + ", but the declared prop name is" +
                              " \"" + key + "\". " +
                              "Note that HTML attributes are case-insensitive and camelCased " +
                              "props need to use their kebab-case equivalents when using in-DOM " +
                              "templates. You should probably use \"" + altKey + "\" instead of \"" + key + "\"."
                          );
                      }
                  }
                  checkProp(res, props, key, altKey, true) ||
                  checkProp(res, attrs, key, altKey, false);
              }
          }
          return res
      }
  
      function checkProp (
          res,
          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 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 (isDef(last) && isDef(last.text)) {
                      (last).text += String(c);
                  } else if (c !== '') {
                      // convert primitive to vnode
                      res.push(createTextVNode(c));
                  }
              } else {
                  if (isDef(c.text) && isDef(last) && isDef(last.text)) {
                      res[res.length - 1] = createTextVNode(last.text + c.text);
                  } else {
                      // default key for nested array children (likely generated by v-for)
                      if (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) {
                  "development" !== 'production' && warn(
                      "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 () {
                              reject(
                                  "timeout (" + (res.timeout) + "ms)"
                              );
                          }, 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;
              {
                  var lowerCaseEvent = event.toLowerCase();
                  if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
                      tip(
                          "Event \"" + lowerCaseEvent + "\" is emitted in component " +
                          (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
                          "Note that HTML attributes are case-insensitive and you cannot use " +
                          "v-on to listen to camelCase events when using in-DOM templates. " +
                          "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
                      );
                  }
              }
              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
      ) {
          var res = {};
          for (var i = 0; i < fns.length; i++) {
              res[fns[i][0]] = fns[i][1];
          }
          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.$options.render = createEmptyVNode;
              {
                  /* istanbul ignore if */
                  if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
                      vm.$options.el || el) {
                      warn(
                          'You are using the runtime-only build of Vue where the template ' +
                          'compiler is not available. Either pre-compile the templates into ' +
                          'render functions, or use the compiler-included build.',
                          vm
                      );
                  } else {
                      warn(
                          'Failed to mount component: template or render function not defined.',
                          vm
                      );
                  }
              }
          }
          callHook(vm, 'beforeMount');
  
          var updateComponent;
          /* istanbul ignore if */
          if ("development" !== 'production' && config.performance && mark) {
              updateComponent = function () {
                  var name = vm._name;
                  var id = vm._uid;
                  var startTag = "vue-perf-start:" + id;
                  var endTag = "vue-perf-end:" + id;
  
                  mark(startTag);
                  var vnode = vm._render();
                  mark(endTag);
                  measure((name + " render"), startTag, endTag);
  
                  mark(startTag);
                  vm._update(vnode, hydrating);
                  mark(endTag);
                  measure((name + " patch"), startTag, endTag);
              };
          } 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.$options.props) {
              observerState.shouldConvert = false;
              {
                  observerState.isSettingProps = true;
              }
              var props = vm._props;
              var propKeys = vm.$options._propKeys || [];
              for (var i = 0; i < propKeys.length; i++) {
                  var key = propKeys[i];
                  props[key] = validateProp(key, vm.$options.props, propsData, vm);
              }
              observerState.shouldConvert = true;
              {
                  observerState.isSettingProps = false;
              }
              // keep a copy of raw propsData
              vm.$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 MAX_UPDATE_COUNT = 100;
  
      var queue = [];
      var activatedChildren = [];
      var has = {};
      var circular = {};
      var waiting = false;
      var flushing = false;
      var index = 0;
  
      /**
       * Reset the scheduler's state.
       */
      function resetSchedulerState () {
          queue.length = activatedChildren.length = 0;
          has = {};
          {
              circular = {};
          }
          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 ("development" !== 'production' && has[id] != null) {
                  circular[id] = (circular[id] || 0) + 1;
                  if (circular[id] > MAX_UPDATE_COUNT) {
                      warn(
                          'You may have an infinite update loop ' + (
                              watcher.user
                                  ? ("in watcher with expression \"" + (watcher.expression) + "\"")
                                  : "in a component render function."
                          ),
                          watcher.vm
                      );
                      break
                  }
              }
          }
  
          // 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 >= 0 && queue[i].id > watcher.id) {
                      i--;
                  }
                  queue.splice(Math.max(i, index) + 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 = expOrFn.toString();
          // parse expression for getter
          if (typeof expOrFn === 'function') {
              this.getter = expOrFn;
          } else {
              this.getter = parsePath(expOrFn);
              if (!this.getter) {
                  this.getter = function () {};
                  "development" !== 'production' && warn(
                      "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); }
      }
  
      var isReservedProp = {
          key: 1,
          ref: 1,
          slot: 1
      };
  
      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 (isReservedProp[key] || config.isReservedAttr(key)) {
                      warn(
                          ("\"" + key + "\" is a reserved attribute and cannot be used as component prop."),
                          vm
                      );
                  }
                  defineReactive$$1(props, key, value, function () {
                      if (vm.$parent && !observerState.isSettingProps) {
                          warn(
                              "Avoid mutating a prop directly since the value will be " +
                              "overwritten whenever the parent component re-renders. " +
                              "Instead, use a data or computed property based on the prop's " +
                              "value. Prop being mutated: \"" + key + "\"",
                              vm
                          );
                      }
                  });
              }
              // 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.$options.data;
          data = vm._data = typeof data === 'function'
              ? getData(data, vm)
              : data || {};
          if (!isPlainObject(data)) {
              data = {};
              "development" !== 'production' && warn(
                  'data functions should return an object:\n' +
                  'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
                  vm
              );
          }
          // proxy data on instance
          var keys = Object.keys(data);
          var props = vm.$options.props;
          var i = keys.length;
          while (i--) {
              if (props && hasOwn(props, keys[i])) {
                  "development" !== 'production' && warn(
                      "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 (getter === undefined) {
                      warn(
                          ("No getter function has been defined for computed property \"" + key + "\"."),
                          vm
                      );
                      getter = noop;
                  }
              }
              // 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 (key in vm.$data) {
                      warn(("The computed property \"" + key + "\" is already defined in data."), vm);
                  } else if (vm.$options.props && key in vm.$options.props) {
                      warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
                  }
              }
          }
      }
  
      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 (methods[key] == null) {
                      warn(
                          "method \"" + key + "\" has an undefined value in the component definition. " +
                          "Did you reference the function correctly?",
                          vm
                      );
                  }
                  if (props && hasOwn(props, key)) {
                      warn(
                          ("method \"" + key + "\" has already been defined as a prop."),
                          vm
                      );
                  }
              }
          }
      }
  
      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 };
          {
              dataDef.set = function (newData) {
                  warn(
                      'Avoid replacing instance root $data. ' +
                      'Use nested data properties instead.',
                      this
                  );
              };
              propsDef.set = function () {
                  warn("$props is readonly.", this);
              };
          }
          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 */
                  {
                      defineReactive$$1(vm, key, result[key], function () {
                          warn(
                              "Avoid mutating an injected value directly since the changes will be " +
                              "overwritten whenever the provided component re-renders. " +
                              "injection being mutated: \"" + key + "\"",
                              vm
                          );
                      });
                  }
              });
          }
      }
  
      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;
              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') {
              {
                  warn(("Invalid Component definition: " + (String(Ctor))), context);
              }
              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__)) {
              "development" !== 'production' && warn(
                  "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
                  'Always create fresh vnode data objects in each render!',
                  context
              );
              return createEmptyVNode()
          }
          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 (vnode !== undefined) {
              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 (Array.isArray(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);
              }
          }
          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 && "development" !== 'production') {
                  slotNodes._rendered && warn(
                      "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)) {
                  "development" !== 'production' && warn(
                      '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 */
                  {
                      vnode = vm.$options.renderError
                          ? vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e)
                          : vm._vnode;
                  }
              }
              // return empty vnode in case the render function errored out
              if (!(vnode instanceof VNode)) {
                  if ("development" !== 'production' && Array.isArray(vnode)) {
                      warn(
                          'Multiple root nodes returned from render function. Render function ' +
                          'should return a single root node.',
                          vm
                      );
                  }
                  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$1 = 0;
  
      function initMixin (Vue) {
          Vue.prototype._init = function (options) {
              var vm = this;
              // a uid
              vm._uid = uid$1++;
  
              var startTag, endTag;
              /* istanbul ignore if */
              if ("development" !== 'production' && config.performance && mark) {
                  startTag = "vue-perf-init:" + (vm._uid);
                  endTag = "vue-perf-end:" + (vm._uid);
                  mark(startTag);
              }
  
              // 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 */
              {
                  initProxy(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 ("development" !== 'production' && config.performance && mark) {
                  vm._name = formatComponentName(vm, false);
                  mark(endTag);
                  measure(((vm._name) + " init"), startTag, endTag);
              }
  
              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 ("development" !== 'production' &&
              !(this instanceof Vue$3)) {
              warn('Vue is a constructor and should be called with the `new` keyword');
          }
          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
              }
              // 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);
          };
      }
  
      /*  */
  
      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 (!/^[a-zA-Z][\w-]*$/.test(name)) {
                      warn(
                          'Invalid component name: "' + name + '". Component names ' +
                          'can only contain alphanumeric characters and the hyphen, ' +
                          'and must start with a letter.'
                      );
                  }
              }
  
              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 (type === 'component' && config.isReservedTag(id)) {
                              warn(
                                  'Do not use built-in or reserved HTML elements as component ' +
                                  'id: ' + id
                              );
                          }
                      }
                      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; };
          {
              configDef.set = function () {
                  warn(
                      'Do not replace the Vue.config object, set individual fields instead.'
                  );
              };
          }
          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,
              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
      });
  
      Vue$3.version = '2.3.0';
  
      /*  */
  
  // 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 isPreTag = function (tag) { return tag === 'pre'; };
  
      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) {
                  "development" !== 'production' && warn(
                      '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 (data && data.pre) {
                          inPre++;
                      }
                      if (
                          !inPre &&
                          !vnode.ns &&
                          !(config.ignoredElements.length && config.ignoredElements.indexOf(tag) > -1) &&
                          config.isUnknownElement(tag)
                      ) {
                          warn(
                              'Unknown custom element: <' + tag + '> - did you ' +
                              'register the component correctly? For recursive components, ' +
                              'make sure to provide the "name" option.',
                              vnode.context
                          );
                      }
                  }
                  vnode.elm = vnode.ns
                      ? nodeOps.createElementNS(vnode.ns, tag)
                      : nodeOps.createElement(tag, vnode);
                  setScope(vnode);
  
                  /* istanbul ignore if */
                  {
                      createChildren(vnode, children, insertedVnodeQueue);
                      if (isDef(data)) {
                          invokeCreateHooks(vnode, insertedVnodeQueue);
                      }
                      insert(parentElm, vnode.elm, refElm);
                  }
  
                  if ("development" !== 'production' && data && data.pre) {
                      inPre--;
                  }
              } 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 ("development" !== 'production' && !elmToMove) {
                              warn(
                                  'It seems there are duplicate keys that is causing an update error. ' +
                                  'Make sure each v-for item has a unique key.'
                              );
                          }
                          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 (!assertNodeMatch(elm, vnode)) {
                      return false
                  }
              }
              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 ("development" !== 'production' &&
                                  typeof console !== 'undefined' &&
                                  !bailed) {
                                  bailed = true;
                                  console.warn('Parent: ', elm);
                                  console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
                              }
                              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 {
                                  warn(
                                      'The client-side rendered virtual DOM tree is not matching ' +
                                      'server-rendered content. This is likely caused by incorrect ' +
                                      'HTML markup, for example nesting block-level elements inside ' +
                                      '<p>, or missing <tbody>. Bailing hydration and performing ' +
                                      'full client-side render.'
                                  );
                              }
                          }
                          // either not server-rendered, or hydration failed.
                          // create an empty node and replace it
                          oldVnode = emptyNodeAt(oldVnode);
                      }
                      // replacing existing element
                      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
      };
  
      /*  */
  
      var validDivisionCharRE = /[\w).+\-_$\]]/;
  
      function parseFilters (exp) {
          var inSingle = false;
          var inDouble = false;
          var inTemplateString = false;
          var inRegex = false;
          var curly = 0;
          var square = 0;
          var paren = 0;
          var lastFilterIndex = 0;
          var c, prev, i, expression, filters;
  
          for (i = 0; i < exp.length; i++) {
              prev = c;
              c = exp.charCodeAt(i);
              if (inSingle) {
                  if (c === 0x27 && prev !== 0x5C) { inSingle = false; }
              } else if (inDouble) {
                  if (c === 0x22 && prev !== 0x5C) { inDouble = false; }
              } else if (inTemplateString) {
                  if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }
              } else if (inRegex) {
                  if (c === 0x2f && prev !== 0x5C) { inRegex = false; }
              } else if (
                  c === 0x7C && // pipe
                  exp.charCodeAt(i + 1) !== 0x7C &&
                  exp.charCodeAt(i - 1) !== 0x7C &&
                  !curly && !square && !paren
              ) {
                  if (expression === undefined) {
                      // first filter, end of expression
                      lastFilterIndex = i + 1;
                      expression = exp.slice(0, i).trim();
                  } else {
                      pushFilter();
                  }
              } else {
                  switch (c) {
                      case 0x22: inDouble = true; break         // "
                      case 0x27: inSingle = true; break         // '
                      case 0x60: inTemplateString = true; break // `
                      case 0x28: paren++; break                 // (
                      case 0x29: paren--; break                 // )
                      case 0x5B: square++; break                // [
                      case 0x5D: square--; break                // ]
                      case 0x7B: curly++; break                 // {
                      case 0x7D: curly--; break                 // }
                  }
                  if (c === 0x2f) { // /
                      var j = i - 1;
                      var p = (void 0);
                      // find first non-whitespace prev char
                      for (; j >= 0; j--) {
                          p = exp.charAt(j);
                          if (p !== ' ') { break }
                      }
                      if (!p || !validDivisionCharRE.test(p)) {
                          inRegex = true;
                      }
                  }
              }
          }
  
          if (expression === undefined) {
              expression = exp.slice(0, i).trim();
          } else if (lastFilterIndex !== 0) {
              pushFilter();
          }
  
          function pushFilter () {
              (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
              lastFilterIndex = i + 1;
          }
  
          if (filters) {
              for (i = 0; i < filters.length; i++) {
                  expression = wrapFilter(expression, filters[i]);
              }
          }
  
          return expression
      }
  
      function wrapFilter (exp, filter) {
          var i = filter.indexOf('(');
          if (i < 0) {
              // _f: resolveFilter
              return ("_f(\"" + filter + "\")(" + exp + ")")
          } else {
              var name = filter.slice(0, i);
              var args = filter.slice(i + 1);
              return ("_f(\"" + name + "\")(" + exp + "," + args)
          }
      }
  
      /*  */
  
      function baseWarn (msg) {
          console.error(("[Vue compiler]: " + msg));
      }
  
      function pluckModuleFunction (
          modules,
          key
      ) {
          return modules
              ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
              : []
      }
  
      function addProp (el, name, value) {
          (el.props || (el.props = [])).push({ name: name, value: value });
      }
  
      function addAttr (el, name, value) {
          (el.attrs || (el.attrs = [])).push({ name: name, value: value });
      }
  
      function addDirective (
          el,
          name,
          rawName,
          value,
          arg,
          modifiers
      ) {
          (el.directives || (el.directives = [])).push({ name: name, rawName: rawName, value: value, arg: arg, modifiers: modifiers });
      }
  
      function addHandler (
          el,
          name,
          value,
          modifiers,
          important,
          warn
      ) {
          // warn prevent and passive modifier
          /* istanbul ignore if */
          if (
              "development" !== 'production' && warn &&
              modifiers && modifiers.prevent && modifiers.passive
          ) {
              warn(
                  'passive and prevent can\'t be used together. ' +
                  'Passive handler can\'t prevent default event.'
              );
          }
          // check capture modifier
          if (modifiers && modifiers.capture) {
              delete modifiers.capture;
              name = '!' + name; // mark the event as captured
          }
          if (modifiers && modifiers.once) {
              delete modifiers.once;
              name = '~' + name; // mark the event as once
          }
          /* istanbul ignore if */
          if (modifiers && modifiers.passive) {
              delete modifiers.passive;
              name = '&' + name; // mark the event as passive
          }
          var events;
          if (modifiers && modifiers.native) {
              delete modifiers.native;
              events = el.nativeEvents || (el.nativeEvents = {});
          } else {
              events = el.events || (el.events = {});
          }
          var newHandler = { value: value, modifiers: modifiers };
          var handlers = events[name];
          /* istanbul ignore if */
          if (Array.isArray(handlers)) {
              important ? handlers.unshift(newHandler) : handlers.push(newHandler);
          } else if (handlers) {
              events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
          } else {
              events[name] = newHandler;
          }
      }
  
      function getBindingAttr (
          el,
          name,
          getStatic
      ) {
          var dynamicValue =
              getAndRemoveAttr(el, ':' + name) ||
              getAndRemoveAttr(el, 'v-bind:' + name);
          if (dynamicValue != null) {
              return parseFilters(dynamicValue)
          } else if (getStatic !== false) {
              var staticValue = getAndRemoveAttr(el, name);
              if (staticValue != null) {
                  return JSON.stringify(staticValue)
              }
          }
      }
  
      function getAndRemoveAttr (el, name) {
          var val;
          if ((val = el.attrsMap[name]) != null) {
              var list = el.attrsList;
              for (var i = 0, l = list.length; i < l; i++) {
                  if (list[i].name === name) {
                      list.splice(i, 1);
                      break
                  }
              }
          }
          return val
      }
  
      /*  */
  
      /**
       * Cross-platform code generation for component v-model
       */
      function genComponentModel (
          el,
          value,
          modifiers
      ) {
          var ref = modifiers || {};
          var number = ref.number;
          var trim = ref.trim;
  
          var baseValueExpression = '$$v';
          var valueExpression = baseValueExpression;
          if (trim) {
              valueExpression =
                  "(typeof " + baseValueExpression + " === 'string'" +
                  "? " + baseValueExpression + ".trim()" +
                  ": " + baseValueExpression + ")";
          }
          if (number) {
              valueExpression = "_n(" + valueExpression + ")";
          }
          var assignment = genAssignmentCode(value, valueExpression);
  
          el.model = {
              value: ("(" + value + ")"),
              expression: ("\"" + value + "\""),
              callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
          };
      }
  
      /**
       * Cross-platform codegen helper for generating v-model value assignment code.
       */
      function genAssignmentCode (
          value,
          assignment
      ) {
          var modelRs = parseModel(value);
          if (modelRs.idx === null) {
              return (value + "=" + assignment)
          } else {
              return "var $$exp = " + (modelRs.exp) + ", $$idx = " + (modelRs.idx) + ";" +
                  "if (!Array.isArray($$exp)){" +
                  value + "=" + assignment + "}" +
                  "else{$$exp.splice($$idx, 1, " + assignment + ")}"
          }
      }
  
      /**
       * parse directive model to do the array update transform. a[idx] = val => $$a.splice($$idx, 1, val)
       *
       * for loop possible cases:
       *
       * - test
       * - test[idx]
       * - test[test1[idx]]
       * - test["a"][idx]
       * - xxx.test[a[a].test1[idx]]
       * - test.xxx.a["asa"][test1[idx]]
       *
       */
  
      var len;
      var str;
      var chr;
      var index$1;
      var expressionPos;
      var expressionEndPos;
  
      function parseModel (val) {
          str = val;
          len = str.length;
          index$1 = expressionPos = expressionEndPos = 0;
  
          if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
              return {
                  exp: val,
                  idx: null
              }
          }
  
          while (!eof()) {
              chr = next();
              /* istanbul ignore if */
              if (isStringStart(chr)) {
                  parseString(chr);
              } else if (chr === 0x5B) {
                  parseBracket(chr);
              }
          }
  
          return {
              exp: val.substring(0, expressionPos),
              idx: val.substring(expressionPos + 1, expressionEndPos)
          }
      }
  
      function next () {
          return str.charCodeAt(++index$1)
      }
  
      function eof () {
          return index$1 >= len
      }
  
      function isStringStart (chr) {
          return chr === 0x22 || chr === 0x27
      }
  
      function parseBracket (chr) {
          var inBracket = 1;
          expressionPos = index$1;
          while (!eof()) {
              chr = next();
              if (isStringStart(chr)) {
                  parseString(chr);
                  continue
              }
              if (chr === 0x5B) { inBracket++; }
              if (chr === 0x5D) { inBracket--; }
              if (inBracket === 0) {
                  expressionEndPos = index$1;
                  break
              }
          }
      }
  
      function parseString (chr) {
          var stringQuote = chr;
          while (!eof()) {
              chr = next();
              if (chr === stringQuote) {
                  break
              }
          }
      }
  
      /*  */
  
      var warn$1;
  
  // 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';
  
      function model (
          el,
          dir,
          _warn
      ) {
          warn$1 = _warn;
          var value = dir.value;
          var modifiers = dir.modifiers;
          var tag = el.tag;
          var type = el.attrsMap.type;
  
          {
              var dynamicType = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];
              if (tag === 'input' && dynamicType) {
                  warn$1(
                      "<input :type=\"" + dynamicType + "\" v-model=\"" + value + "\">:\n" +
                      "v-model does not support dynamic input types. Use v-if branches instead."
                  );
              }
              // inputs with type="file" are read only and setting the input's
              // value will throw an error.
              if (tag === 'input' && type === 'file') {
                  warn$1(
                      "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
                      "File inputs are read only. Use a v-on:change listener instead."
                  );
              }
          }
  
          if (tag === 'select') {
              genSelect(el, value, modifiers);
          } else if (tag === 'input' && type === 'checkbox') {
              genCheckboxModel(el, value, modifiers);
          } else if (tag === 'input' && type === 'radio') {
              genRadioModel(el, value, modifiers);
          } else if (tag === 'input' || tag === 'textarea') {
              genDefaultModel(el, value, modifiers);
          } else if (!config.isReservedTag(tag)) {
              genComponentModel(el, value, modifiers);
              // component v-model doesn't need extra runtime
              return false
          } else {
              warn$1(
                  "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                  "v-model is not supported on this element type. " +
                  'If you are working with contenteditable, it\'s recommended to ' +
                  'wrap a library dedicated for that purpose inside a custom component.'
              );
          }
  
          // ensure runtime directive metadata
          return true
      }
  
      function genCheckboxModel (
          el,
          value,
          modifiers
      ) {
          var number = modifiers && modifiers.number;
          var valueBinding = getBindingAttr(el, 'value') || 'null';
          var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
          var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
          addProp(el, 'checked',
              "Array.isArray(" + value + ")" +
              "?_i(" + value + "," + valueBinding + ")>-1" + (
                  trueValueBinding === 'true'
                      ? (":(" + value + ")")
                      : (":_q(" + value + "," + trueValueBinding + ")")
              )
          );
          addHandler(el, CHECKBOX_RADIO_TOKEN,
              "var $$a=" + value + "," +
              '$$el=$event.target,' +
              "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
              'if(Array.isArray($$a)){' +
              "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
              '$$i=_i($$a,$$v);' +
              "if($$c){$$i<0&&(" + value + "=$$a.concat($$v))}" +
              "else{$$i>-1&&(" + value + "=$$a.slice(0,$$i).concat($$a.slice($$i+1)))}" +
              "}else{" + (genAssignmentCode(value, '$$c')) + "}",
              null, true
          );
      }
  
      function genRadioModel (
          el,
          value,
          modifiers
      ) {
          var number = modifiers && modifiers.number;
          var valueBinding = getBindingAttr(el, 'value') || 'null';
          valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
          addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
          addHandler(el, CHECKBOX_RADIO_TOKEN, genAssignmentCode(value, valueBinding), null, true);
      }
  
      function genSelect (
          el,
          value,
          modifiers
      ) {
          var number = modifiers && modifiers.number;
          var selectedVal = "Array.prototype.filter" +
              ".call($event.target.options,function(o){return o.selected})" +
              ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
              "return " + (number ? '_n(val)' : 'val') + "})";
  
          var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
          var code = "var $$selectedVal = " + selectedVal + ";";
          code = code + " " + (genAssignmentCode(value, assignment));
          addHandler(el, 'change', code, null, true);
      }
  
      function genDefaultModel (
          el,
          value,
          modifiers
      ) {
          var type = el.attrsMap.type;
          var ref = modifiers || {};
          var lazy = ref.lazy;
          var number = ref.number;
          var trim = ref.trim;
          var needCompositionGuard = !lazy && type !== 'range';
          var event = lazy
              ? 'change'
              : type === 'range'
                  ? RANGE_TOKEN
                  : 'input';
  
          var valueExpression = '$event.target.value';
          if (trim) {
              valueExpression = "$event.target.value.trim()";
          }
          if (number) {
              valueExpression = "_n(" + valueExpression + ")";
          }
  
          var code = genAssignmentCode(value, valueExpression);
          if (needCompositionGuard) {
              code = "if($event.target.composing)return;" + code;
          }
  
          addProp(el, 'value', ("(" + value + ")"));
          addHandler(el, event, code, null, true);
          if (trim || number || type === 'number') {
              addHandler(el, 'blur', '$forceUpdate()');
          }
      }
  
      /*  */
  
  // 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 = cur == null ? '' : 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 ref = (data);
          var css = ref.css;
          var type = ref.type;
          var enterClass = ref.enterClass;
          var enterToClass = ref.enterToClass;
          var enterActiveClass = ref.enterActiveClass;
          var appearClass = ref.appearClass;
          var appearToClass = ref.appearToClass;
          var appearActiveClass = ref.appearActiveClass;
          var beforeEnter = ref.beforeEnter;
          var enter = ref.enter;
          var afterEnter = ref.afterEnter;
          var enterCancelled = ref.enterCancelled;
          var beforeAppear = ref.beforeAppear;
          var appear = ref.appear;
          var afterAppear = ref.afterAppear;
          var appearCancelled = ref.appearCancelled;
          var duration = ref.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 ("development" !== 'production' && explicitEnterDuration != null) {
              checkDuration(explicitEnterDuration, 'enter', vnode);
          }
  
          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 ref = (data);
          var css = ref.css;
          var type = ref.type;
          var leaveClass = ref.leaveClass;
          var leaveToClass = ref.leaveToClass;
          var leaveActiveClass = ref.leaveActiveClass;
          var beforeLeave = ref.beforeLeave;
          var leave = ref.leave;
          var afterLeave = ref.afterLeave;
          var leaveCancelled = ref.leaveCancelled;
          var delayLeave = ref.delayLeave;
          var duration = ref.duration;
  
          var expectsCSS = css !== false && !isIE9;
          var userWantsControl = getHookArgumentsLength(leave);
  
          var explicitLeaveDuration = toNumber(
              isObject(duration)
                  ? duration.leave
                  : duration
          );
  
          if ("development" !== 'production' && explicitLeaveDuration != null) {
              checkDuration(explicitLeaveDuration, 'leave', vnode);
          }
  
          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();
              }
          }
      }
  
  // only used in dev mode
      function checkDuration (val, name, vnode) {
          if (typeof val !== 'number') {
              warn(
                  "<transition> explicit " + name + " duration is not a valid number - " +
                  "got " + (JSON.stringify(val)) + ".",
                  vnode.context
              );
          } else if (isNaN(val)) {
              warn(
                  "<transition> explicit " + name + " duration is NaN - " +
                  'the duration expression might be incorrect.',
                  vnode.context
              );
          }
      }
  
      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)) {
              "development" !== 'production' && warn(
                  "<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) {
          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 ("development" !== 'production' && children.length > 1) {
                  warn(
                      '<transition> can only be used on a single element. Use ' +
                      '<transition-group> for lists.',
                      this.$parent
                  );
              }
  
              var mode = this.mode;
  
              // warn invalid mode
              if ("development" !== 'production' &&
                  mode && mode !== 'in-out' && mode !== 'out-in') {
                  warn(
                      'invalid <transition> mode: ' + mode,
                      this.$parent
                  );
              }
  
              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 {
                          var opts = c.componentOptions;
                          var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
                          warn(("<transition-group> children must be keyed: <" + name + ">"));
                      }
                  }
              }
  
              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 ("development" !== 'production' && isChrome) {
                  console[console.info ? 'info' : 'log'](
                      'Download the Vue Devtools extension for a better development experience:\n' +
                      'https://github.com/vuejs/vue-devtools'
                  );
              }
          }
          if ("development" !== 'production' &&
              config.productionTip !== false &&
              inBrowser && typeof console !== 'undefined') {
              console[console.info ? 'info' : 'log'](
                  "You are running Vue in development mode.\n" +
                  "Make sure to turn on production mode when deploying for production.\n" +
                  "See more tips at https://vuejs.org/guide/deployment.html"
              );
          }
      }, 0);
  
      /*  */
  
  // check whether current browser encodes a char inside attribute values
      function shouldDecode (content, encoded) {
          var div = document.createElement('div');
          div.innerHTML = "<div a=\"" + content + "\">";
          return div.innerHTML.indexOf(encoded) > 0
      }
  
  // #3663
  // IE encodes newlines inside attribute values while other browsers don't
      var shouldDecodeNewlines = inBrowser ? shouldDecode('\n', '&#10;') : false;
  
      /*  */
  
      var isUnaryTag = makeMap(
          'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
          'link,meta,param,source,track,wbr'
      );
  
  // Elements that you can, intentionally, leave open
  // (and which close themselves)
      var canBeLeftOpenTag = makeMap(
          'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'
      );
  
  // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
  // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
      var isNonPhrasingTag = makeMap(
          'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
          'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
          'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
          'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
          'title,tr,track'
      );
  
      /*  */
  
      var decoder;
  
      function decode (html) {
          decoder = decoder || document.createElement('div');
          decoder.innerHTML = html;
          return decoder.textContent
      }
  
      /**
       * Not type-checking this file because it's mostly vendor code.
       */
  
      /*!
       * HTML Parser By John Resig (ejohn.org)
       * Modified by Juriy "kangax" Zaytsev
       * Original code by Erik Arvidsson, Mozilla Public License
       * http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
       */
  
  // Regular Expressions for parsing tags and attributes
      var singleAttrIdentifier = /([^\s"'<>/=]+)/;
      var singleAttrAssign = /(?:=)/;
      var singleAttrValues = [
          // attr value double quotes
          /"([^"]*)"+/.source,
          // attr value, single quotes
          /'([^']*)'+/.source,
          // attr value, no quotes
          /([^\s"'=<>`]+)/.source
      ];
      var attribute = new RegExp(
          '^\\s*' + singleAttrIdentifier.source +
          '(?:\\s*(' + singleAttrAssign.source + ')' +
          '\\s*(?:' + singleAttrValues.join('|') + '))?'
      );
  
  // could use https://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName
  // but for Vue templates we can enforce a simple charset
      var ncname = '[a-zA-Z_][\\w\\-\\.]*';
      var qnameCapture = '((?:' + ncname + '\\:)?' + ncname + ')';
      var startTagOpen = new RegExp('^<' + qnameCapture);
      var startTagClose = /^\s*(\/?)>/;
      var endTag = new RegExp('^<\\/' + qnameCapture + '[^>]*>');
      var doctype = /^<!DOCTYPE [^>]+>/i;
      var comment = /^<!--/;
      var conditionalComment = /^<!\[/;
  
      var IS_REGEX_CAPTURING_BROKEN = false;
      'x'.replace(/x(.)?/g, function (m, g) {
          IS_REGEX_CAPTURING_BROKEN = g === '';
      });
  
  // Special Elements (can contain anything)
      var isPlainTextElement = makeMap('script,style,textarea', true);
      var reCache = {};
  
      var decodingMap = {
          '&lt;': '<',
          '&gt;': '>',
          '&quot;': '"',
          '&amp;': '&',
          '&#10;': '\n'
      };
      var encodedAttr = /&(?:lt|gt|quot|amp);/g;
      var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#10);/g;
  
      function decodeAttr (value, shouldDecodeNewlines) {
          var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
          return value.replace(re, function (match) { return decodingMap[match]; })
      }
  
      function parseHTML (html, options) {
          var stack = [];
          var expectHTML = options.expectHTML;
          var isUnaryTag$$1 = options.isUnaryTag || no;
          var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
          var index = 0;
          var last, lastTag;
          while (html) {
              last = html;
              // Make sure we're not in a plaintext content element like script/style
              if (!lastTag || !isPlainTextElement(lastTag)) {
                  var textEnd = html.indexOf('<');
                  if (textEnd === 0) {
                      // Comment:
                      if (comment.test(html)) {
                          var commentEnd = html.indexOf('-->');
  
                          if (commentEnd >= 0) {
                              advance(commentEnd + 3);
                              continue
                          }
                      }
  
                      // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
                      if (conditionalComment.test(html)) {
                          var conditionalEnd = html.indexOf(']>');
  
                          if (conditionalEnd >= 0) {
                              advance(conditionalEnd + 2);
                              continue
                          }
                      }
  
                      // Doctype:
                      var doctypeMatch = html.match(doctype);
                      if (doctypeMatch) {
                          advance(doctypeMatch[0].length);
                          continue
                      }
  
                      // End tag:
                      var endTagMatch = html.match(endTag);
                      if (endTagMatch) {
                          var curIndex = index;
                          advance(endTagMatch[0].length);
                          parseEndTag(endTagMatch[1], curIndex, index);
                          continue
                      }
  
                      // Start tag:
                      var startTagMatch = parseStartTag();
                      if (startTagMatch) {
                          handleStartTag(startTagMatch);
                          continue
                      }
                  }
  
                  var text = (void 0), rest$1 = (void 0), next = (void 0);
                  if (textEnd >= 0) {
                      rest$1 = html.slice(textEnd);
                      while (
                      !endTag.test(rest$1) &&
                      !startTagOpen.test(rest$1) &&
                      !comment.test(rest$1) &&
                      !conditionalComment.test(rest$1)
                          ) {
                          // < in plain text, be forgiving and treat it as text
                          next = rest$1.indexOf('<', 1);
                          if (next < 0) { break }
                          textEnd += next;
                          rest$1 = html.slice(textEnd);
                      }
                      text = html.substring(0, textEnd);
                      advance(textEnd);
                  }
  
                  if (textEnd < 0) {
                      text = html;
                      html = '';
                  }
  
                  if (options.chars && text) {
                      options.chars(text);
                  }
              } else {
                  var stackedTag = lastTag.toLowerCase();
                  var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
                  var endTagLength = 0;
                  var rest = html.replace(reStackedTag, function (all, text, endTag) {
                      endTagLength = endTag.length;
                      if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
                          text = text
                              .replace(/<!--([\s\S]*?)-->/g, '$1')
                              .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
                      }
                      if (options.chars) {
                          options.chars(text);
                      }
                      return ''
                  });
                  index += html.length - rest.length;
                  html = rest;
                  parseEndTag(stackedTag, index - endTagLength, index);
              }
  
              if (html === last) {
                  options.chars && options.chars(html);
                  if ("development" !== 'production' && !stack.length && options.warn) {
                      options.warn(("Mal-formatted tag at end of template: \"" + html + "\""));
                  }
                  break
              }
          }
  
          // Clean up any remaining tags
          parseEndTag();
  
          function advance (n) {
              index += n;
              html = html.substring(n);
          }
  
          function parseStartTag () {
              var start = html.match(startTagOpen);
              if (start) {
                  var match = {
                      tagName: start[1],
                      attrs: [],
                      start: index
                  };
                  advance(start[0].length);
                  var end, attr;
                  while (!(end = html.match(startTagClose)) && (attr = html.match(attribute))) {
                      advance(attr[0].length);
                      match.attrs.push(attr);
                  }
                  if (end) {
                      match.unarySlash = end[1];
                      advance(end[0].length);
                      match.end = index;
                      return match
                  }
              }
          }
  
          function handleStartTag (match) {
              var tagName = match.tagName;
              var unarySlash = match.unarySlash;
  
              if (expectHTML) {
                  if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
                      parseEndTag(lastTag);
                  }
                  if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
                      parseEndTag(tagName);
                  }
              }
  
              var unary = isUnaryTag$$1(tagName) || tagName === 'html' && lastTag === 'head' || !!unarySlash;
  
              var l = match.attrs.length;
              var attrs = new Array(l);
              for (var i = 0; i < l; i++) {
                  var args = match.attrs[i];
                  // hackish work around FF bug https://bugzilla.mozilla.org/show_bug.cgi?id=369778
                  if (IS_REGEX_CAPTURING_BROKEN && args[0].indexOf('""') === -1) {
                      if (args[3] === '') { delete args[3]; }
                      if (args[4] === '') { delete args[4]; }
                      if (args[5] === '') { delete args[5]; }
                  }
                  var value = args[3] || args[4] || args[5] || '';
                  attrs[i] = {
                      name: args[1],
                      value: decodeAttr(
                          value,
                          options.shouldDecodeNewlines
                      )
                  };
              }
  
              if (!unary) {
                  stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs });
                  lastTag = tagName;
              }
  
              if (options.start) {
                  options.start(tagName, attrs, unary, match.start, match.end);
              }
          }
  
          function parseEndTag (tagName, start, end) {
              var pos, lowerCasedTagName;
              if (start == null) { start = index; }
              if (end == null) { end = index; }
  
              if (tagName) {
                  lowerCasedTagName = tagName.toLowerCase();
              }
  
              // Find the closest opened tag of the same type
              if (tagName) {
                  for (pos = stack.length - 1; pos >= 0; pos--) {
                      if (stack[pos].lowerCasedTag === lowerCasedTagName) {
                          break
                      }
                  }
              } else {
                  // If no tag name is provided, clean shop
                  pos = 0;
              }
  
              if (pos >= 0) {
                  // Close all the open elements, up the stack
                  for (var i = stack.length - 1; i >= pos; i--) {
                      if ("development" !== 'production' &&
                          (i > pos || !tagName) &&
                          options.warn) {
                          options.warn(
                              ("tag <" + (stack[i].tag) + "> has no matching end tag.")
                          );
                      }
                      if (options.end) {
                          options.end(stack[i].tag, start, end);
                      }
                  }
  
                  // Remove the open elements from the stack
                  stack.length = pos;
                  lastTag = pos && stack[pos - 1].tag;
              } else if (lowerCasedTagName === 'br') {
                  if (options.start) {
                      options.start(tagName, [], true, start, end);
                  }
              } else if (lowerCasedTagName === 'p') {
                  if (options.start) {
                      options.start(tagName, [], false, start, end);
                  }
                  if (options.end) {
                      options.end(tagName, start, end);
                  }
              }
          }
      }
  
      /*  */
  
      var defaultTagRE = /\{\{((?:.|\n)+?)\}\}/g;
      var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;
  
      var buildRegex = cached(function (delimiters) {
          var open = delimiters[0].replace(regexEscapeRE, '\\$&');
          var close = delimiters[1].replace(regexEscapeRE, '\\$&');
          return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
      });
  
      function parseText (
          text,
          delimiters
      ) {
          var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
          if (!tagRE.test(text)) {
              return
          }
          var tokens = [];
          var lastIndex = tagRE.lastIndex = 0;
          var match, index;
          while ((match = tagRE.exec(text))) {
              index = match.index;
              // push text token
              if (index > lastIndex) {
                  tokens.push(JSON.stringify(text.slice(lastIndex, index)));
              }
              // tag token
              var exp = parseFilters(match[1].trim());
              tokens.push(("_s(" + exp + ")"));
              lastIndex = index + match[0].length;
          }
          if (lastIndex < text.length) {
              tokens.push(JSON.stringify(text.slice(lastIndex)));
          }
          return tokens.join('+')
      }
  
      /*  */
  
      var onRE = /^@|^v-on:/;
      var dirRE = /^v-|^@|^:/;
      var forAliasRE = /(.*?)\s+(?:in|of)\s+(.*)/;
      var forIteratorRE = /\((\{[^}]*\}|[^,]*),([^,]*)(?:,([^,]*))?\)/;
  
      var argRE = /:(.*)$/;
      var bindRE = /^:|^v-bind:/;
      var modifierRE = /\.[^.]+/g;
  
      var decodeHTMLCached = cached(decode);
  
  // configurable state
      var warn$2;
      var delimiters;
      var transforms;
      var preTransforms;
      var postTransforms;
      var platformIsPreTag;
      var platformMustUseProp;
      var platformGetTagNamespace;
  
      /**
       * Convert HTML string to AST.
       */
      function parse (
          template,
          options
      ) {
          warn$2 = options.warn || baseWarn;
          platformGetTagNamespace = options.getTagNamespace || no;
          platformMustUseProp = options.mustUseProp || no;
          platformIsPreTag = options.isPreTag || no;
          preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
          transforms = pluckModuleFunction(options.modules, 'transformNode');
          postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');
          delimiters = options.delimiters;
  
          var stack = [];
          var preserveWhitespace = options.preserveWhitespace !== false;
          var root;
          var currentParent;
          var inVPre = false;
          var inPre = false;
          var warned = false;
  
          function warnOnce (msg) {
              if (!warned) {
                  warned = true;
                  warn$2(msg);
              }
          }
  
          function endPre (element) {
              // check pre state
              if (element.pre) {
                  inVPre = false;
              }
              if (platformIsPreTag(element.tag)) {
                  inPre = false;
              }
          }
  
          parseHTML(template, {
              warn: warn$2,
              expectHTML: options.expectHTML,
              isUnaryTag: options.isUnaryTag,
              canBeLeftOpenTag: options.canBeLeftOpenTag,
              shouldDecodeNewlines: options.shouldDecodeNewlines,
              start: function start (tag, attrs, unary) {
                  // check namespace.
                  // inherit parent ns if there is one
                  var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);
  
                  // handle IE svg bug
                  /* istanbul ignore if */
                  if (isIE && ns === 'svg') {
                      attrs = guardIESVGBug(attrs);
                  }
  
                  var element = {
                      type: 1,
                      tag: tag,
                      attrsList: attrs,
                      attrsMap: makeAttrsMap(attrs),
                      parent: currentParent,
                      children: []
                  };
                  if (ns) {
                      element.ns = ns;
                  }
  
                  if (isForbiddenTag(element) && !isServerRendering()) {
                      element.forbidden = true;
                      "development" !== 'production' && warn$2(
                          'Templates should only be responsible for mapping the state to the ' +
                          'UI. Avoid placing tags with side-effects in your templates, such as ' +
                          "<" + tag + ">" + ', as they will not be parsed.'
                      );
                  }
  
                  // apply pre-transforms
                  for (var i = 0; i < preTransforms.length; i++) {
                      preTransforms[i](element, options);
                  }
  
                  if (!inVPre) {
                      processPre(element);
                      if (element.pre) {
                          inVPre = true;
                      }
                  }
                  if (platformIsPreTag(element.tag)) {
                      inPre = true;
                  }
                  if (inVPre) {
                      processRawAttrs(element);
                  } else {
                      processFor(element);
                      processIf(element);
                      processOnce(element);
                      processKey(element);
  
                      // determine whether this is a plain element after
                      // removing structural attributes
                      element.plain = !element.key && !attrs.length;
  
                      processRef(element);
                      processSlot(element);
                      processComponent(element);
                      for (var i$1 = 0; i$1 < transforms.length; i$1++) {
                          transforms[i$1](element, options);
                      }
                      processAttrs(element);
                  }
  
                  function checkRootConstraints (el) {
                      {
                          if (el.tag === 'slot' || el.tag === 'template') {
                              warnOnce(
                                  "Cannot use <" + (el.tag) + "> as component root element because it may " +
                                  'contain multiple nodes.'
                              );
                          }
                          if (el.attrsMap.hasOwnProperty('v-for')) {
                              warnOnce(
                                  'Cannot use v-for on stateful component root element because ' +
                                  'it renders multiple elements.'
                              );
                          }
                      }
                  }
  
                  // tree management
                  if (!root) {
                      root = element;
                      checkRootConstraints(root);
                  } else if (!stack.length) {
                      // allow root elements with v-if, v-else-if and v-else
                      if (root.if && (element.elseif || element.else)) {
                          checkRootConstraints(element);
                          addIfCondition(root, {
                              exp: element.elseif,
                              block: element
                          });
                      } else {
                          warnOnce(
                              "Component template should contain exactly one root element. " +
                              "If you are using v-if on multiple elements, " +
                              "use v-else-if to chain them instead."
                          );
                      }
                  }
                  if (currentParent && !element.forbidden) {
                      if (element.elseif || element.else) {
                          processIfConditions(element, currentParent);
                      } else if (element.slotScope) { // scoped slot
                          currentParent.plain = false;
                          var name = element.slotTarget || '"default"';(currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
                      } else {
                          currentParent.children.push(element);
                          element.parent = currentParent;
                      }
                  }
                  if (!unary) {
                      currentParent = element;
                      stack.push(element);
                  } else {
                      endPre(element);
                  }
                  // apply post-transforms
                  for (var i$2 = 0; i$2 < postTransforms.length; i$2++) {
                      postTransforms[i$2](element, options);
                  }
              },
  
              end: function end () {
                  // remove trailing whitespace
                  var element = stack[stack.length - 1];
                  var lastNode = element.children[element.children.length - 1];
                  if (lastNode && lastNode.type === 3 && lastNode.text === ' ' && !inPre) {
                      element.children.pop();
                  }
                  // pop stack
                  stack.length -= 1;
                  currentParent = stack[stack.length - 1];
                  endPre(element);
              },
  
              chars: function chars (text) {
                  if (!currentParent) {
                      {
                          if (text === template) {
                              warnOnce(
                                  'Component template requires a root element, rather than just text.'
                              );
                          } else if ((text = text.trim())) {
                              warnOnce(
                                  ("text \"" + text + "\" outside root element will be ignored.")
                              );
                          }
                      }
                      return
                  }
                  // IE textarea placeholder bug
                  /* istanbul ignore if */
                  if (isIE &&
                      currentParent.tag === 'textarea' &&
                      currentParent.attrsMap.placeholder === text) {
                      return
                  }
                  var children = currentParent.children;
                  text = inPre || text.trim()
                      ? isTextTag(currentParent) ? text : decodeHTMLCached(text)
                      // only preserve whitespace if its not right after a starting tag
                      : preserveWhitespace && children.length ? ' ' : '';
                  if (text) {
                      var expression;
                      if (!inVPre && text !== ' ' && (expression = parseText(text, delimiters))) {
                          children.push({
                              type: 2,
                              expression: expression,
                              text: text
                          });
                      } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
                          children.push({
                              type: 3,
                              text: text
                          });
                      }
                  }
              }
          });
          return root
      }
  
      function processPre (el) {
          if (getAndRemoveAttr(el, 'v-pre') != null) {
              el.pre = true;
          }
      }
  
      function processRawAttrs (el) {
          var l = el.attrsList.length;
          if (l) {
              var attrs = el.attrs = new Array(l);
              for (var i = 0; i < l; i++) {
                  attrs[i] = {
                      name: el.attrsList[i].name,
                      value: JSON.stringify(el.attrsList[i].value)
                  };
              }
          } else if (!el.pre) {
              // non root node in pre blocks with no attributes
              el.plain = true;
          }
      }
  
      function processKey (el) {
          var exp = getBindingAttr(el, 'key');
          if (exp) {
              if ("development" !== 'production' && el.tag === 'template') {
                  warn$2("<template> cannot be keyed. Place the key on real elements instead.");
              }
              el.key = exp;
          }
      }
  
      function processRef (el) {
          var ref = getBindingAttr(el, 'ref');
          if (ref) {
              el.ref = ref;
              el.refInFor = checkInFor(el);
          }
      }
  
      function processFor (el) {
          var exp;
          if ((exp = getAndRemoveAttr(el, 'v-for'))) {
              var inMatch = exp.match(forAliasRE);
              if (!inMatch) {
                  "development" !== 'production' && warn$2(
                      ("Invalid v-for expression: " + exp)
                  );
                  return
              }
              el.for = inMatch[2].trim();
              var alias = inMatch[1].trim();
              var iteratorMatch = alias.match(forIteratorRE);
              if (iteratorMatch) {
                  el.alias = iteratorMatch[1].trim();
                  el.iterator1 = iteratorMatch[2].trim();
                  if (iteratorMatch[3]) {
                      el.iterator2 = iteratorMatch[3].trim();
                  }
              } else {
                  el.alias = alias;
              }
          }
      }
  
      function processIf (el) {
          var exp = getAndRemoveAttr(el, 'v-if');
          if (exp) {
              el.if = exp;
              addIfCondition(el, {
                  exp: exp,
                  block: el
              });
          } else {
              if (getAndRemoveAttr(el, 'v-else') != null) {
                  el.else = true;
              }
              var elseif = getAndRemoveAttr(el, 'v-else-if');
              if (elseif) {
                  el.elseif = elseif;
              }
          }
      }
  
      function processIfConditions (el, parent) {
          var prev = findPrevElement(parent.children);
          if (prev && prev.if) {
              addIfCondition(prev, {
                  exp: el.elseif,
                  block: el
              });
          } else {
              warn$2(
                  "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
                  "used on element <" + (el.tag) + "> without corresponding v-if."
              );
          }
      }
  
      function findPrevElement (children) {
          var i = children.length;
          while (i--) {
              if (children[i].type === 1) {
                  return children[i]
              } else {
                  if ("development" !== 'production' && children[i].text !== ' ') {
                      warn$2(
                          "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
                          "will be ignored."
                      );
                  }
                  children.pop();
              }
          }
      }
  
      function addIfCondition (el, condition) {
          if (!el.ifConditions) {
              el.ifConditions = [];
          }
          el.ifConditions.push(condition);
      }
  
      function processOnce (el) {
          var once$$1 = getAndRemoveAttr(el, 'v-once');
          if (once$$1 != null) {
              el.once = true;
          }
      }
  
      function processSlot (el) {
          if (el.tag === 'slot') {
              el.slotName = getBindingAttr(el, 'name');
              if ("development" !== 'production' && el.key) {
                  warn$2(
                      "`key` does not work on <slot> because slots are abstract outlets " +
                      "and can possibly expand into multiple elements. " +
                      "Use the key on a wrapping element instead."
                  );
              }
          } else {
              var slotTarget = getBindingAttr(el, 'slot');
              if (slotTarget) {
                  el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
              }
              if (el.tag === 'template') {
                  el.slotScope = getAndRemoveAttr(el, 'scope');
              }
          }
      }
  
      function processComponent (el) {
          var binding;
          if ((binding = getBindingAttr(el, 'is'))) {
              el.component = binding;
          }
          if (getAndRemoveAttr(el, 'inline-template') != null) {
              el.inlineTemplate = true;
          }
      }
  
      function processAttrs (el) {
          var list = el.attrsList;
          var i, l, name, rawName, value, modifiers, isProp;
          for (i = 0, l = list.length; i < l; i++) {
              name = rawName = list[i].name;
              value = list[i].value;
              if (dirRE.test(name)) {
                  // mark element as dynamic
                  el.hasBindings = true;
                  // modifiers
                  modifiers = parseModifiers(name);
                  if (modifiers) {
                      name = name.replace(modifierRE, '');
                  }
                  if (bindRE.test(name)) { // v-bind
                      name = name.replace(bindRE, '');
                      value = parseFilters(value);
                      isProp = false;
                      if (modifiers) {
                          if (modifiers.prop) {
                              isProp = true;
                              name = camelize(name);
                              if (name === 'innerHtml') { name = 'innerHTML'; }
                          }
                          if (modifiers.camel) {
                              name = camelize(name);
                          }
                          if (modifiers.sync) {
                              addHandler(
                                  el,
                                  ("update:" + (camelize(name))),
                                  genAssignmentCode(value, "$event")
                              );
                          }
                      }
                      if (isProp || platformMustUseProp(el.tag, el.attrsMap.type, name)) {
                          addProp(el, name, value);
                      } else {
                          addAttr(el, name, value);
                      }
                  } else if (onRE.test(name)) { // v-on
                      name = name.replace(onRE, '');
                      addHandler(el, name, value, modifiers, false, warn$2);
                  } else { // normal directives
                      name = name.replace(dirRE, '');
                      // parse arg
                      var argMatch = name.match(argRE);
                      var arg = argMatch && argMatch[1];
                      if (arg) {
                          name = name.slice(0, -(arg.length + 1));
                      }
                      addDirective(el, name, rawName, value, arg, modifiers);
                      if ("development" !== 'production' && name === 'model') {
                          checkForAliasModel(el, value);
                      }
                  }
              } else {
                  // literal attribute
                  {
                      var expression = parseText(value, delimiters);
                      if (expression) {
                          warn$2(
                              name + "=\"" + value + "\": " +
                              'Interpolation inside attributes has been removed. ' +
                              'Use v-bind or the colon shorthand instead. For example, ' +
                              'instead of <div id="{{ val }}">, use <div :id="val">.'
                          );
                      }
                  }
                  addAttr(el, name, JSON.stringify(value));
              }
          }
      }
  
      function checkInFor (el) {
          var parent = el;
          while (parent) {
              if (parent.for !== undefined) {
                  return true
              }
              parent = parent.parent;
          }
          return false
      }
  
      function parseModifiers (name) {
          var match = name.match(modifierRE);
          if (match) {
              var ret = {};
              match.forEach(function (m) { ret[m.slice(1)] = true; });
              return ret
          }
      }
  
      function makeAttrsMap (attrs) {
          var map = {};
          for (var i = 0, l = attrs.length; i < l; i++) {
              if (
                  "development" !== 'production' &&
                  map[attrs[i].name] && !isIE && !isEdge
              ) {
                  warn$2('duplicate attribute: ' + attrs[i].name);
              }
              map[attrs[i].name] = attrs[i].value;
          }
          return map
      }
  
  // for script (e.g. type="x/template") or style, do not decode content
      function isTextTag (el) {
          return el.tag === 'script' || el.tag === 'style'
      }
  
      function isForbiddenTag (el) {
          return (
              el.tag === 'style' ||
              (el.tag === 'script' && (
                  !el.attrsMap.type ||
                  el.attrsMap.type === 'text/javascript'
              ))
          )
      }
  
      var ieNSBug = /^xmlns:NS\d+/;
      var ieNSPrefix = /^NS\d+:/;
  
      /* istanbul ignore next */
      function guardIESVGBug (attrs) {
          var res = [];
          for (var i = 0; i < attrs.length; i++) {
              var attr = attrs[i];
              if (!ieNSBug.test(attr.name)) {
                  attr.name = attr.name.replace(ieNSPrefix, '');
                  res.push(attr);
              }
          }
          return res
      }
  
      function checkForAliasModel (el, value) {
          var _el = el;
          while (_el) {
              if (_el.for && _el.alias === value) {
                  warn$2(
                      "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                      "You are binding v-model directly to a v-for iteration alias. " +
                      "This will not be able to modify the v-for source array because " +
                      "writing to the alias is like modifying a function local variable. " +
                      "Consider using an array of objects and use v-model on an object property instead."
                  );
              }
              _el = _el.parent;
          }
      }
  
      /*  */
  
      var isStaticKey;
      var isPlatformReservedTag;
  
      var genStaticKeysCached = cached(genStaticKeys$1);
  
      /**
       * Goal of the optimizer: walk the generated template AST tree
       * and detect sub-trees that are purely static, i.e. parts of
       * the DOM that never needs to change.
       *
       * Once we detect these sub-trees, we can:
       *
       * 1. Hoist them into constants, so that we no longer need to
       *    create fresh nodes for them on each re-render;
       * 2. Completely skip them in the patching process.
       */
      function optimize (root, options) {
          if (!root) { return }
          isStaticKey = genStaticKeysCached(options.staticKeys || '');
          isPlatformReservedTag = options.isReservedTag || no;
          // first pass: mark all non-static nodes.
          markStatic$1(root);
          // second pass: mark static roots.
          markStaticRoots(root, false);
      }
  
      function genStaticKeys$1 (keys) {
          return makeMap(
              'type,tag,attrsList,attrsMap,plain,parent,children,attrs' +
              (keys ? ',' + keys : '')
          )
      }
  
      function markStatic$1 (node) {
          node.static = isStatic(node);
          if (node.type === 1) {
              // do not make component slot content static. this avoids
              // 1. components not able to mutate slot nodes
              // 2. static slot content fails for hot-reloading
              if (
                  !isPlatformReservedTag(node.tag) &&
                  node.tag !== 'slot' &&
                  node.attrsMap['inline-template'] == null
              ) {
                  return
              }
              for (var i = 0, l = node.children.length; i < l; i++) {
                  var child = node.children[i];
                  markStatic$1(child);
                  if (!child.static) {
                      node.static = false;
                  }
              }
          }
      }
  
      function markStaticRoots (node, isInFor) {
          if (node.type === 1) {
              if (node.static || node.once) {
                  node.staticInFor = isInFor;
              }
              // For a node to qualify as a static root, it should have children that
              // are not just static text. Otherwise the cost of hoisting out will
              // outweigh the benefits and it's better off to just always render it fresh.
              if (node.static && node.children.length && !(
                      node.children.length === 1 &&
                      node.children[0].type === 3
                  )) {
                  node.staticRoot = true;
                  return
              } else {
                  node.staticRoot = false;
              }
              if (node.children) {
                  for (var i = 0, l = node.children.length; i < l; i++) {
                      markStaticRoots(node.children[i], isInFor || !!node.for);
                  }
              }
              if (node.ifConditions) {
                  walkThroughConditionsBlocks(node.ifConditions, isInFor);
              }
          }
      }
  
      function walkThroughConditionsBlocks (conditionBlocks, isInFor) {
          for (var i = 1, len = conditionBlocks.length; i < len; i++) {
              markStaticRoots(conditionBlocks[i].block, isInFor);
          }
      }
  
      function isStatic (node) {
          if (node.type === 2) { // expression
              return false
          }
          if (node.type === 3) { // text
              return true
          }
          return !!(node.pre || (
              !node.hasBindings && // no dynamic bindings
              !node.if && !node.for && // not v-if or v-for or v-else
              !isBuiltInTag(node.tag) && // not a built-in
              isPlatformReservedTag(node.tag) && // not a component
              !isDirectChildOfTemplateFor(node) &&
              Object.keys(node).every(isStaticKey)
          ))
      }
  
      function isDirectChildOfTemplateFor (node) {
          while (node.parent) {
              node = node.parent;
              if (node.tag !== 'template') {
                  return false
              }
              if (node.for) {
                  return true
              }
          }
          return false
      }
  
      /*  */
  
      var fnExpRE = /^\s*([\w$_]+|\([^)]*?\))\s*=>|^function\s*\(/;
      var simplePathRE = /^\s*[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['.*?']|\[".*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*\s*$/;
  
  // keyCode aliases
      var keyCodes = {
          esc: 27,
          tab: 9,
          enter: 13,
          space: 32,
          up: 38,
          left: 37,
          right: 39,
          down: 40,
          'delete': [8, 46]
      };
  
  // #4868: modifiers that prevent the execution of the listener
  // need to explicitly return null so that we can determine whether to remove
  // the listener for .once
      var genGuard = function (condition) { return ("if(" + condition + ")return null;"); };
  
      var modifierCode = {
          stop: '$event.stopPropagation();',
          prevent: '$event.preventDefault();',
          self: genGuard("$event.target !== $event.currentTarget"),
          ctrl: genGuard("!$event.ctrlKey"),
          shift: genGuard("!$event.shiftKey"),
          alt: genGuard("!$event.altKey"),
          meta: genGuard("!$event.metaKey"),
          left: genGuard("'button' in $event && $event.button !== 0"),
          middle: genGuard("'button' in $event && $event.button !== 1"),
          right: genGuard("'button' in $event && $event.button !== 2")
      };
  
      function genHandlers (
          events,
          native,
          warn
      ) {
          var res = native ? 'nativeOn:{' : 'on:{';
          for (var name in events) {
              var handler = events[name];
              // #5330: warn click.right, since right clicks do not actually fire click events.
              if ("development" !== 'production' &&
                  name === 'click' &&
                  handler && handler.modifiers && handler.modifiers.right
              ) {
                  warn(
                      "Use \"contextmenu\" instead of \"click.right\" since right clicks " +
                      "do not actually fire \"click\" events."
                  );
              }
              res += "\"" + name + "\":" + (genHandler(name, handler)) + ",";
          }
          return res.slice(0, -1) + '}'
      }
  
      function genHandler (
          name,
          handler
      ) {
          if (!handler) {
              return 'function(){}'
          }
  
          if (Array.isArray(handler)) {
              return ("[" + (handler.map(function (handler) { return genHandler(name, handler); }).join(',')) + "]")
          }
  
          var isMethodPath = simplePathRE.test(handler.value);
          var isFunctionExpression = fnExpRE.test(handler.value);
  
          if (!handler.modifiers) {
              return isMethodPath || isFunctionExpression
                  ? handler.value
                  : ("function($event){" + (handler.value) + "}") // inline statement
          } else {
              var code = '';
              var genModifierCode = '';
              var keys = [];
              for (var key in handler.modifiers) {
                  if (modifierCode[key]) {
                      genModifierCode += modifierCode[key];
                      // left/right
                      if (keyCodes[key]) {
                          keys.push(key);
                      }
                  } else {
                      keys.push(key);
                  }
              }
              if (keys.length) {
                  code += genKeyFilter(keys);
              }
              // Make sure modifiers like prevent and stop get executed after key filtering
              if (genModifierCode) {
                  code += genModifierCode;
              }
              var handlerCode = isMethodPath
                  ? handler.value + '($event)'
                  : isFunctionExpression
                      ? ("(" + (handler.value) + ")($event)")
                      : handler.value;
              return ("function($event){" + code + handlerCode + "}")
          }
      }
  
      function genKeyFilter (keys) {
          return ("if(!('button' in $event)&&" + (keys.map(genFilterCode).join('&&')) + ")return null;")
      }
  
      function genFilterCode (key) {
          var keyVal = parseInt(key, 10);
          if (keyVal) {
              return ("$event.keyCode!==" + keyVal)
          }
          var alias = keyCodes[key];
          return ("_k($event.keyCode," + (JSON.stringify(key)) + (alias ? ',' + JSON.stringify(alias) : '') + ")")
      }
  
      /*  */
  
      function bind$1 (el, dir) {
          el.wrapData = function (code) {
              return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + (dir.modifiers && dir.modifiers.prop ? ',true' : '') + ")")
          };
      }
  
      /*  */
  
      var baseDirectives = {
          bind: bind$1,
          cloak: noop
      };
  
      /*  */
  
  // configurable state
      var warn$3;
      var transforms$1;
      var dataGenFns;
      var platformDirectives$1;
      var isPlatformReservedTag$1;
      var staticRenderFns;
      var onceCount;
      var currentOptions;
  
      function generate (
          ast,
          options
      ) {
          // save previous staticRenderFns so generate calls can be nested
          var prevStaticRenderFns = staticRenderFns;
          var currentStaticRenderFns = staticRenderFns = [];
          var prevOnceCount = onceCount;
          onceCount = 0;
          currentOptions = options;
          warn$3 = options.warn || baseWarn;
          transforms$1 = pluckModuleFunction(options.modules, 'transformCode');
          dataGenFns = pluckModuleFunction(options.modules, 'genData');
          platformDirectives$1 = options.directives || {};
          isPlatformReservedTag$1 = options.isReservedTag || no;
          var code = ast ? genElement(ast) : '_c("div")';
          staticRenderFns = prevStaticRenderFns;
          onceCount = prevOnceCount;
          return {
              render: ("with(this){return " + code + "}"),
              staticRenderFns: currentStaticRenderFns
          }
      }
  
      function genElement (el) {
          if (el.staticRoot && !el.staticProcessed) {
              return genStatic(el)
          } else if (el.once && !el.onceProcessed) {
              return genOnce(el)
          } else if (el.for && !el.forProcessed) {
              return genFor(el)
          } else if (el.if && !el.ifProcessed) {
              return genIf(el)
          } else if (el.tag === 'template' && !el.slotTarget) {
              return genChildren(el) || 'void 0'
          } else if (el.tag === 'slot') {
              return genSlot(el)
          } else {
              // component or element
              var code;
              if (el.component) {
                  code = genComponent(el.component, el);
              } else {
                  var data = el.plain ? undefined : genData(el);
  
                  var children = el.inlineTemplate ? null : genChildren(el, true);
                  code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
              }
              // module transforms
              for (var i = 0; i < transforms$1.length; i++) {
                  code = transforms$1[i](el, code);
              }
              return code
          }
      }
  
  // hoist static sub-trees out
      function genStatic (el) {
          el.staticProcessed = true;
          staticRenderFns.push(("with(this){return " + (genElement(el)) + "}"));
          return ("_m(" + (staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
      }
  
  // v-once
      function genOnce (el) {
          el.onceProcessed = true;
          if (el.if && !el.ifProcessed) {
              return genIf(el)
          } else if (el.staticInFor) {
              var key = '';
              var parent = el.parent;
              while (parent) {
                  if (parent.for) {
                      key = parent.key;
                      break
                  }
                  parent = parent.parent;
              }
              if (!key) {
                  "development" !== 'production' && warn$3(
                      "v-once can only be used inside v-for that is keyed. "
                  );
                  return genElement(el)
              }
              return ("_o(" + (genElement(el)) + "," + (onceCount++) + (key ? ("," + key) : "") + ")")
          } else {
              return genStatic(el)
          }
      }
  
      function genIf (el) {
          el.ifProcessed = true; // avoid recursion
          return genIfConditions(el.ifConditions.slice())
      }
  
      function genIfConditions (conditions) {
          if (!conditions.length) {
              return '_e()'
          }
  
          var condition = conditions.shift();
          if (condition.exp) {
              return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions)))
          } else {
              return ("" + (genTernaryExp(condition.block)))
          }
  
          // v-if with v-once should generate code like (a)?_m(0):_m(1)
          function genTernaryExp (el) {
              return el.once ? genOnce(el) : genElement(el)
          }
      }
  
      function genFor (el) {
          var exp = el.for;
          var alias = el.alias;
          var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
          var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
  
          if (
              "development" !== 'production' &&
              maybeComponent(el) && el.tag !== 'slot' && el.tag !== 'template' && !el.key
          ) {
              warn$3(
                  "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
                  "v-for should have explicit keys. " +
                  "See https://vuejs.org/guide/list.html#key for more info.",
                  true /* tip */
              );
          }
  
          el.forProcessed = true; // avoid recursion
          return "_l((" + exp + ")," +
              "function(" + alias + iterator1 + iterator2 + "){" +
              "return " + (genElement(el)) +
              '})'
      }
  
      function genData (el) {
          var data = '{';
  
          // directives first.
          // directives may mutate the el's other properties before they are generated.
          var dirs = genDirectives(el);
          if (dirs) { data += dirs + ','; }
  
          // key
          if (el.key) {
              data += "key:" + (el.key) + ",";
          }
          // ref
          if (el.ref) {
              data += "ref:" + (el.ref) + ",";
          }
          if (el.refInFor) {
              data += "refInFor:true,";
          }
          // pre
          if (el.pre) {
              data += "pre:true,";
          }
          // record original tag name for components using "is" attribute
          if (el.component) {
              data += "tag:\"" + (el.tag) + "\",";
          }
          // module data generation functions
          for (var i = 0; i < dataGenFns.length; i++) {
              data += dataGenFns[i](el);
          }
          // attributes
          if (el.attrs) {
              data += "attrs:{" + (genProps(el.attrs)) + "},";
          }
          // DOM props
          if (el.props) {
              data += "domProps:{" + (genProps(el.props)) + "},";
          }
          // event handlers
          if (el.events) {
              data += (genHandlers(el.events, false, warn$3)) + ",";
          }
          if (el.nativeEvents) {
              data += (genHandlers(el.nativeEvents, true, warn$3)) + ",";
          }
          // slot target
          if (el.slotTarget) {
              data += "slot:" + (el.slotTarget) + ",";
          }
          // scoped slots
          if (el.scopedSlots) {
              data += (genScopedSlots(el.scopedSlots)) + ",";
          }
          // component v-model
          if (el.model) {
              data += "model:{value:" + (el.model.value) + ",callback:" + (el.model.callback) + ",expression:" + (el.model.expression) + "},";
          }
          // inline-template
          if (el.inlineTemplate) {
              var inlineTemplate = genInlineTemplate(el);
              if (inlineTemplate) {
                  data += inlineTemplate + ",";
              }
          }
          data = data.replace(/,$/, '') + '}';
          // v-bind data wrap
          if (el.wrapData) {
              data = el.wrapData(data);
          }
          return data
      }
  
      function genDirectives (el) {
          var dirs = el.directives;
          if (!dirs) { return }
          var res = 'directives:[';
          var hasRuntime = false;
          var i, l, dir, needRuntime;
          for (i = 0, l = dirs.length; i < l; i++) {
              dir = dirs[i];
              needRuntime = true;
              var gen = platformDirectives$1[dir.name] || baseDirectives[dir.name];
              if (gen) {
                  // compile-time directive that manipulates AST.
                  // returns true if it also needs a runtime counterpart.
                  needRuntime = !!gen(el, dir, warn$3);
              }
              if (needRuntime) {
                  hasRuntime = true;
                  res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:\"" + (dir.arg) + "\"") : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
              }
          }
          if (hasRuntime) {
              return res.slice(0, -1) + ']'
          }
      }
  
      function genInlineTemplate (el) {
          var ast = el.children[0];
          if ("development" !== 'production' && (
                  el.children.length > 1 || ast.type !== 1
              )) {
              warn$3('Inline-template components must have exactly one child element.');
          }
          if (ast.type === 1) {
              var inlineRenderFns = generate(ast, currentOptions);
              return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
          }
      }
  
      function genScopedSlots (slots) {
          return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) { return genScopedSlot(key, slots[key]); }).join(',')) + "])")
      }
  
      function genScopedSlot (key, el) {
          return "[" + key + ",function(" + (String(el.attrsMap.scope)) + "){" +
              "return " + (el.tag === 'template'
                  ? genChildren(el) || 'void 0'
                  : genElement(el)) + "}]"
      }
  
      function genChildren (el, checkSkip) {
          var children = el.children;
          if (children.length) {
              var el$1 = children[0];
              // optimize single v-for
              if (children.length === 1 &&
                  el$1.for &&
                  el$1.tag !== 'template' &&
                  el$1.tag !== 'slot') {
                  return genElement(el$1)
              }
              var normalizationType = checkSkip ? getNormalizationType(children) : 0;
              return ("[" + (children.map(genNode).join(',')) + "]" + (normalizationType ? ("," + normalizationType) : ''))
          }
      }
  
  // determine the normalization needed for the children array.
  // 0: no normalization needed
  // 1: simple normalization needed (possible 1-level deep nested array)
  // 2: full normalization needed
      function getNormalizationType (children) {
          var res = 0;
          for (var i = 0; i < children.length; i++) {
              var el = children[i];
              if (el.type !== 1) {
                  continue
              }
              if (needsNormalization(el) ||
                  (el.ifConditions && el.ifConditions.some(function (c) { return needsNormalization(c.block); }))) {
                  res = 2;
                  break
              }
              if (maybeComponent(el) ||
                  (el.ifConditions && el.ifConditions.some(function (c) { return maybeComponent(c.block); }))) {
                  res = 1;
              }
          }
          return res
      }
  
      function needsNormalization (el) {
          return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
      }
  
      function maybeComponent (el) {
          return !isPlatformReservedTag$1(el.tag)
      }
  
      function genNode (node) {
          if (node.type === 1) {
              return genElement(node)
          } else {
              return genText(node)
          }
      }
  
      function genText (text) {
          return ("_v(" + (text.type === 2
              ? text.expression // no need for () because already wrapped in _s()
              : transformSpecialNewlines(JSON.stringify(text.text))) + ")")
      }
  
      function genSlot (el) {
          var slotName = el.slotName || '"default"';
          var children = genChildren(el);
          var res = "_t(" + slotName + (children ? ("," + children) : '');
          var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
          var bind$$1 = el.attrsMap['v-bind'];
          if ((attrs || bind$$1) && !children) {
              res += ",null";
          }
          if (attrs) {
              res += "," + attrs;
          }
          if (bind$$1) {
              res += (attrs ? '' : ',null') + "," + bind$$1;
          }
          return res + ')'
      }
  
  // componentName is el.component, take it as argument to shun flow's pessimistic refinement
      function genComponent (componentName, el) {
          var children = el.inlineTemplate ? null : genChildren(el, true);
          return ("_c(" + componentName + "," + (genData(el)) + (children ? ("," + children) : '') + ")")
      }
  
      function genProps (props) {
          var res = '';
          for (var i = 0; i < props.length; i++) {
              var prop = props[i];
              res += "\"" + (prop.name) + "\":" + (transformSpecialNewlines(prop.value)) + ",";
          }
          return res.slice(0, -1)
      }
  
  // #3895, #4268
      function transformSpecialNewlines (text) {
          return text
              .replace(/\u2028/g, '\\u2028')
              .replace(/\u2029/g, '\\u2029')
      }
  
      /*  */
  
  // these keywords should not appear inside expressions, but operators like
  // typeof, instanceof and in are allowed
      var prohibitedKeywordRE = new RegExp('\\b' + (
              'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
              'super,throw,while,yield,delete,export,import,return,switch,default,' +
              'extends,finally,continue,debugger,function,arguments'
          ).split(',').join('\\b|\\b') + '\\b');
  
  // these unary operators should not be used as property/method names
      var unaryOperatorsRE = new RegExp('\\b' + (
              'delete,typeof,void'
          ).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');
  
  // check valid identifier for v-for
      var identRE = /[A-Za-z_$][\w$]*/;
  
  // strip strings in expressions
      var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;
  
  // detect problematic expressions in a template
      function detectErrors (ast) {
          var errors = [];
          if (ast) {
              checkNode(ast, errors);
          }
          return errors
      }
  
      function checkNode (node, errors) {
          if (node.type === 1) {
              for (var name in node.attrsMap) {
                  if (dirRE.test(name)) {
                      var value = node.attrsMap[name];
                      if (value) {
                          if (name === 'v-for') {
                              checkFor(node, ("v-for=\"" + value + "\""), errors);
                          } else if (onRE.test(name)) {
                              checkEvent(value, (name + "=\"" + value + "\""), errors);
                          } else {
                              checkExpression(value, (name + "=\"" + value + "\""), errors);
                          }
                      }
                  }
              }
              if (node.children) {
                  for (var i = 0; i < node.children.length; i++) {
                      checkNode(node.children[i], errors);
                  }
              }
          } else if (node.type === 2) {
              checkExpression(node.expression, node.text, errors);
          }
      }
  
      function checkEvent (exp, text, errors) {
          var stipped = exp.replace(stripStringRE, '');
          var keywordMatch = stipped.match(unaryOperatorsRE);
          if (keywordMatch && stipped.charAt(keywordMatch.index - 1) !== '$') {
              errors.push(
                  "avoid using JavaScript unary operator as property name: " +
                  "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim())
              );
          }
          checkExpression(exp, text, errors);
      }
  
      function checkFor (node, text, errors) {
          checkExpression(node.for || '', text, errors);
          checkIdentifier(node.alias, 'v-for alias', text, errors);
          checkIdentifier(node.iterator1, 'v-for iterator', text, errors);
          checkIdentifier(node.iterator2, 'v-for iterator', text, errors);
      }
  
      function checkIdentifier (ident, type, text, errors) {
          if (typeof ident === 'string' && !identRE.test(ident)) {
              errors.push(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())));
          }
      }
  
      function checkExpression (exp, text, errors) {
          try {
              new Function(("return " + exp));
          } catch (e) {
              var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
              if (keywordMatch) {
                  errors.push(
                      "avoid using JavaScript keyword as property name: " +
                      "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim())
                  );
              } else {
                  errors.push(("invalid expression: " + (text.trim())));
              }
          }
      }
  
      /*  */
  
      function baseCompile (
          template,
          options
      ) {
          var ast = parse(template.trim(), options);
          optimize(ast, options);
          var code = generate(ast, options);
          return {
              ast: ast,
              render: code.render,
              staticRenderFns: code.staticRenderFns
          }
      }
  
      function makeFunction (code, errors) {
          try {
              return new Function(code)
          } catch (err) {
              errors.push({ err: err, code: code });
              return noop
          }
      }
  
      function createCompiler (baseOptions) {
          var functionCompileCache = Object.create(null);
  
          function compile (
              template,
              options
          ) {
              var finalOptions = Object.create(baseOptions);
              var errors = [];
              var tips = [];
              finalOptions.warn = function (msg, tip$$1) {
                  (tip$$1 ? tips : errors).push(msg);
              };
  
              if (options) {
                  // merge custom modules
                  if (options.modules) {
                      finalOptions.modules = (baseOptions.modules || []).concat(options.modules);
                  }
                  // merge custom directives
                  if (options.directives) {
                      finalOptions.directives = extend(
                          Object.create(baseOptions.directives),
                          options.directives
                      );
                  }
                  // copy other options
                  for (var key in options) {
                      if (key !== 'modules' && key !== 'directives') {
                          finalOptions[key] = options[key];
                      }
                  }
              }
  
              var compiled = baseCompile(template, finalOptions);
              {
                  errors.push.apply(errors, detectErrors(compiled.ast));
              }
              compiled.errors = errors;
              compiled.tips = tips;
              return compiled
          }
  
          function compileToFunctions (
              template,
              options,
              vm
          ) {
              options = options || {};
  
              /* istanbul ignore if */
              {
                  // detect possible CSP restriction
                  try {
                      new Function('return 1');
                  } catch (e) {
                      if (e.toString().match(/unsafe-eval|CSP/)) {
                          warn(
                              'It seems you are using the standalone build of Vue.js in an ' +
                              'environment with Content Security Policy that prohibits unsafe-eval. ' +
                              'The template compiler cannot work in this environment. Consider ' +
                              'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
                              'templates into render functions.'
                          );
                      }
                  }
              }
  
              // check cache
              var key = options.delimiters
                  ? String(options.delimiters) + template
                  : template;
              if (functionCompileCache[key]) {
                  return functionCompileCache[key]
              }
  
              // compile
              var compiled = compile(template, options);
  
              // check compilation errors/tips
              {
                  if (compiled.errors && compiled.errors.length) {
                      warn(
                          "Error compiling template:\n\n" + template + "\n\n" +
                          compiled.errors.map(function (e) { return ("- " + e); }).join('\n') + '\n',
                          vm
                      );
                  }
                  if (compiled.tips && compiled.tips.length) {
                      compiled.tips.forEach(function (msg) { return tip(msg, vm); });
                  }
              }
  
              // turn code into functions
              var res = {};
              var fnGenErrors = [];
              res.render = makeFunction(compiled.render, fnGenErrors);
              var l = compiled.staticRenderFns.length;
              res.staticRenderFns = new Array(l);
              for (var i = 0; i < l; i++) {
                  res.staticRenderFns[i] = makeFunction(compiled.staticRenderFns[i], fnGenErrors);
              }
  
              // check function generation errors.
              // this should only happen if there is a bug in the compiler itself.
              // mostly for codegen development use
              /* istanbul ignore if */
              {
                  if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
                      warn(
                          "Failed to generate render function:\n\n" +
                          fnGenErrors.map(function (ref) {
                              var err = ref.err;
                              var code = ref.code;
  
                              return ((err.toString()) + " in\n\n" + code + "\n");
                          }).join('\n'),
                          vm
                      );
                  }
              }
  
              return (functionCompileCache[key] = res)
          }
  
          return {
              compile: compile,
              compileToFunctions: compileToFunctions
          }
      }
  
      /*  */
  
      function transformNode (el, options) {
          var warn = options.warn || baseWarn;
          var staticClass = getAndRemoveAttr(el, 'class');
          if ("development" !== 'production' && staticClass) {
              var expression = parseText(staticClass, options.delimiters);
              if (expression) {
                  warn(
                      "class=\"" + staticClass + "\": " +
                      'Interpolation inside attributes has been removed. ' +
                      'Use v-bind or the colon shorthand instead. For example, ' +
                      'instead of <div class="{{ val }}">, use <div :class="val">.'
                  );
              }
          }
          if (staticClass) {
              el.staticClass = JSON.stringify(staticClass);
          }
          var classBinding = getBindingAttr(el, 'class', false /* getStatic */);
          if (classBinding) {
              el.classBinding = classBinding;
          }
      }
  
      function genData$1 (el) {
          var data = '';
          if (el.staticClass) {
              data += "staticClass:" + (el.staticClass) + ",";
          }
          if (el.classBinding) {
              data += "class:" + (el.classBinding) + ",";
          }
          return data
      }
  
      var klass$1 = {
          staticKeys: ['staticClass'],
          transformNode: transformNode,
          genData: genData$1
      };
  
      /*  */
  
      function transformNode$1 (el, options) {
          var warn = options.warn || baseWarn;
          var staticStyle = getAndRemoveAttr(el, 'style');
          if (staticStyle) {
              /* istanbul ignore if */
              {
                  var expression = parseText(staticStyle, options.delimiters);
                  if (expression) {
                      warn(
                          "style=\"" + staticStyle + "\": " +
                          'Interpolation inside attributes has been removed. ' +
                          'Use v-bind or the colon shorthand instead. For example, ' +
                          'instead of <div style="{{ val }}">, use <div :style="val">.'
                      );
                  }
              }
              el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
          }
  
          var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
          if (styleBinding) {
              el.styleBinding = styleBinding;
          }
      }
  
      function genData$2 (el) {
          var data = '';
          if (el.staticStyle) {
              data += "staticStyle:" + (el.staticStyle) + ",";
          }
          if (el.styleBinding) {
              data += "style:(" + (el.styleBinding) + "),";
          }
          return data
      }
  
      var style$1 = {
          staticKeys: ['staticStyle'],
          transformNode: transformNode$1,
          genData: genData$2
      };
  
      var modules$1 = [
          klass$1,
          style$1
      ];
  
      /*  */
  
      function text (el, dir) {
          if (dir.value) {
              addProp(el, 'textContent', ("_s(" + (dir.value) + ")"));
          }
      }
  
      /*  */
  
      function html (el, dir) {
          if (dir.value) {
              addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"));
          }
      }
  
      var directives$1 = {
          model: model,
          text: text,
          html: html
      };
  
      /*  */
  
      var baseOptions = {
          expectHTML: true,
          modules: modules$1,
          directives: directives$1,
          isPreTag: isPreTag,
          isUnaryTag: isUnaryTag,
          mustUseProp: mustUseProp,
          canBeLeftOpenTag: canBeLeftOpenTag,
          isReservedTag: isReservedTag,
          getTagNamespace: getTagNamespace,
          staticKeys: genStaticKeys(modules$1)
      };
  
      var ref$1 = createCompiler(baseOptions);
      var compileToFunctions = ref$1.compileToFunctions;
  
      /*  */
  
      var idToTemplate = cached(function (id) {
          var el = query(id);
          return el && el.innerHTML
      });
  
      var mount = Vue$3.prototype.$mount;
      Vue$3.prototype.$mount = function (
          el,
          hydrating
      ) {
          el = el && query(el);
  
          /* istanbul ignore if */
          if (el === document.body || el === document.documentElement) {
              "development" !== 'production' && warn(
                  "Do not mount Vue to <html> or <body> - mount to normal elements instead."
              );
              return this
          }
  
          var options = this.$options;
          // resolve template/el and convert to render function
          if (!options.render) {
              var template = options.template;
              if (template) {
                  if (typeof template === 'string') {
                      if (template.charAt(0) === '#') {
                          template = idToTemplate(template);
                          /* istanbul ignore if */
                          if ("development" !== 'production' && !template) {
                              warn(
                                  ("Template element not found or is empty: " + (options.template)),
                                  this
                              );
                          }
                      }
                  } else if (template.nodeType) {
                      template = template.innerHTML;
                  } else {
                      {
                          warn('invalid template option:' + template, this);
                      }
                      return this
                  }
              } else if (el) {
                  template = getOuterHTML(el);
              }
              if (template) {
                  /* istanbul ignore if */
                  if ("development" !== 'production' && config.performance && mark) {
                      mark('compile');
                  }
  
                  var ref = compileToFunctions(template, {
                      shouldDecodeNewlines: shouldDecodeNewlines,
                      delimiters: options.delimiters
                  }, this);
                  var render = ref.render;
                  var staticRenderFns = ref.staticRenderFns;
                  options.render = render;
                  options.staticRenderFns = staticRenderFns;
  
                  /* istanbul ignore if */
                  if ("development" !== 'production' && config.performance && mark) {
                      mark('compile end');
                      measure(((this._name) + " compile"), 'compile', 'compile end');
                  }
              }
          }
          return mount.call(this, el, hydrating)
      };
  
      /**
       * Get outerHTML of elements, taking care
       * of SVG elements in IE as well.
       */
      function getOuterHTML (el) {
          if (el.outerHTML) {
              return el.outerHTML
          } else {
              var container = document.createElement('div');
              container.appendChild(el.cloneNode(true));
              return container.innerHTML
          }
      }
  
      Vue$3.compile = compileToFunctions;
  
      return Vue$3;
  
  })));