(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = global || self, global.vue = factory());
}(this, function () { 'use strict';

  /*  */

  var emptyobject = object.freeze({});

  // these helpers produce better vm code in js engines due to their
  // explicitness and function inlining.
  function isundef (v) {
    return v === undefined || v === null
  }

  function isdef (v) {
    return v !== undefined && v !== null
  }

  function istrue (v) {
    return v === true
  }

  function isfalse (v) {
    return v === false
  }

  /**
   * check if value is primitive.
   */
  function isprimitive (value) {
    return (
      typeof value === 'string' ||
      typeof value === 'number' ||
      // $flow-disable-line
      typeof value === 'symbol' ||
      typeof value === 'boolean'
    )
  }

  /**
   * 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'
  }

  /**
   * get the raw type string of a value, e.g., [object object].
   */
  var _tostring = object.prototype.tostring;

  function torawtype (value) {
    return _tostring.call(value).slice(8, -1)
  }

  /**
   * 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]'
  }

  /**
   * check if val is a valid array index.
   */
  function isvalidarrayindex (val) {
    var n = parsefloat(string(val));
    return n >= 0 && math.floor(n) === n && isfinite(val)
  }

  function ispromise (val) {
    return (
      isdef(val) &&
      typeof val.then === 'function' &&
      typeof val.catch === 'function'
    )
  }

  /**
   * convert a value to a string that is actually rendered.
   */
  function tostring (val) {
    return val == null
      ? ''
      : array.isarray(val) || (isplainobject(val) && val.tostring === _tostring)
        ? json.stringify(val, null, 2)
        : string(val)
  }

  /**
   * convert an 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);

  /**
   * check if an attribute is a reserved attribute.
   */
  var isreservedattribute = makemap('key,ref,slot,slot-scope,is');

  /**
   * 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 an 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 = /\b([a-z])/g;
  var hyphenate = cached(function (str) {
    return str.replace(hyphenatere, '-$1').tolowercase()
  });

  /**
   * simple bind polyfill for environments that do not support it,
   * e.g., phantomjs 1.x. technically, we don't need this anymore
   * since native bind is now performant enough in most browsers.
   * but removing it would mean breaking code that was able to run in
   * phantomjs 1.x, so this must be kept for backward compatibility.
   */

  /* istanbul ignore next */
  function polyfillbind (fn, ctx) {
    function boundfn (a) {
      var l = arguments.length;
      return l
        ? l > 1
          ? fn.apply(ctx, arguments)
          : fn.call(ctx, a)
        : fn.call(ctx)
    }

    boundfn._length = fn.length;
    return boundfn
  }

  function nativebind (fn, ctx) {
    return fn.bind(ctx)
  }

  var bind = function.prototype.bind
    ? nativebind
    : polyfillbind;

  /**
   * 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
  }

  /* eslint-disable no-unused-vars */

  /**
   * perform no operation.
   * stubbing args to make flow happy without leaving useless transpiled code
   */
  function noop (a, b, c) {}

  /**
   * always return false.
   */
  var no = function (a, b, c) { return false; };

  /* eslint-enable no-unused-vars */

  /**
   * return the same value.
   */
  var identity = function (_) { return _; };

  /**
   * generate a string containing static keys 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) {
    if (a === b) { return true }
    var isobjecta = isobject(a);
    var isobjectb = isobject(b);
    if (isobjecta && isobjectb) {
      try {
        var isarraya = array.isarray(a);
        var isarrayb = array.isarray(b);
        if (isarraya && isarrayb) {
          return a.length === b.length && a.every(function (e, i) {
            return looseequal(e, b[i])
          })
        } else if (a instanceof date && b instanceof date) {
          return a.gettime() === b.gettime()
        } else if (!isarraya && !isarrayb) {
          var keysa = object.keys(a);
          var keysb = object.keys(b);
          return keysa.length === keysb.length && keysa.every(function (key) {
            return looseequal(a[key], b[key])
          })
        } else {
          /* istanbul ignore next */
          return false
        }
      } catch (e) {
        /* istanbul ignore next */
        return false
      }
    } else if (!isobjecta && !isobjectb) {
      return string(a) === string(b)
    } else {
      return false
    }
  }

  /**
   * return the first index at which a loosely equal value can be
   * found in the array (if value is a plain object, the array must
   * contain an object of the same shape), or -1 if it is not present.
   */
  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',
    'errorcaptured',
    'serverprefetch'
  ];

  /*  */



  var config = ({
    /**
     * option merge strategies (used in core/util/options)
     */
    // $flow-disable-line
    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,

    /**
     * warn handler for watcher warns
     */
    warnhandler: null,

    /**
     * ignore certain custom elements
     */
    ignoredelements: [],

    /**
     * custom user key aliases for v-on
     */
    // $flow-disable-line
    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,

    /**
     * perform updates asynchronously. intended to be used by vue test utils
     * this will significantly reduce performance if set to false.
     */
    async: true,

    /**
     * exposed for legacy reasons
     */
    _lifecyclehooks: lifecycle_hooks
  });

  /*  */

  /**
   * unicode letters used for parsing html tags, component names and property paths.
   * skipping \u10000-\ueffff due to it freezing up phantomjs
   */
  var unicoderegexp = /a-za-z\u00b7\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u037d\u037f-\u1fff\u200c-\u200d\u203f-\u2040\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd/;

  /**
   * 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 = new regexp(("[^" + (unicoderegexp.source) + ".$_\\d]"));
  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
    }
  }

  /*  */

  // can we use __proto__?
  var hasproto = '__proto__' in {};

  // browser environment sniffing
  var inbrowser = typeof window !== 'undefined';
  var inweex = typeof wxenvironment !== 'undefined' && !!wxenvironment.platform;
  var weexplatform = inweex && wxenvironment.platform.tolowercase();
  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) || (weexplatform === 'android');
  var isios = (ua && /iphone|ipad|ipod|ios/.test(ua)) || (weexplatform === 'ios');
  var ischrome = ua && /chrome\/\d+/.test(ua) && !isedge;
  var isphantomjs = ua && /phantomjs/.test(ua);
  var isff = ua && ua.match(/firefox\/(\d+)/);

  // firefox has a "watch" function on object.prototype...
  var nativewatch = ({}).watch;

  var supportspassive = false;
  if (inbrowser) {
    try {
      var opts = {};
      object.defineproperty(opts, 'passive', ({
        get: function get () {
          /* istanbul ignore next */
          supportspassive = true;
        }
      }));
      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 && !inweex && typeof global !== 'undefined') {
        // detect presence of vue-server-renderer and avoid
        // webpack shimming the process
        _isserver = global['process'] && 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);

  var _set;
  /* istanbul ignore if */ // $flow-disable-line
  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 = /*@__pure__*/(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 warn = noop;
  var tip = noop;
  var generatecomponenttrace = (noop); // work around flow check
  var formatcomponentname = (noop);

  {
    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) {
      var trace = vm ? generatecomponenttrace(vm) : '';

      if (config.warnhandler) {
        config.warnhandler.call(null, msg, vm, trace);
      } else if (hasconsole && (!config.silent)) {
        console.error(("[vue warn]: " + msg + trace));
      }
    };

    tip = function (msg, vm) {
      if (hasconsole && (!config.silent)) {
        console.warn("[vue tip]: " + msg + (
          vm ? generatecomponenttrace(vm) : ''
        ));
      }
    };

    formatcomponentname = function (vm, includefile) {
      if (vm.$root === vm) {
        return '<root>'
      }
      var options = typeof vm === 'function' && vm.cid != null
        ? vm.options
        : vm._isvue
          ? vm.$options || vm.constructor.options
          : vm;
      var name = options.name || options._componenttag;
      var file = 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
    };

    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)) + ")")
      }
    };
  }

  /*  */

  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();
    if (!config.async) {
      // subs aren't sorted in scheduler if not running async
      // we need to sort them now to make sure they fire in correct
      // order
      subs.sort(function (a, b) { return a.id - b.id; });
    }
    for (var i = 0, l = subs.length; i < l; i++) {
      subs[i].update();
    }
  };

  // the current target watcher being evaluated.
  // this is globally unique because only one watcher
  // can be evaluated at a time.
  dep.target = null;
  var targetstack = [];

  function pushtarget (target) {
    targetstack.push(target);
    dep.target = target;
  }

  function poptarget () {
    targetstack.pop();
    dep.target = targetstack[targetstack.length - 1];
  }

  /*  */

  var vnode = function vnode (
    tag,
    data,
    children,
    text,
    elm,
    context,
    componentoptions,
    asyncfactory
  ) {
    this.tag = tag;
    this.data = data;
    this.children = children;
    this.text = text;
    this.elm = elm;
    this.ns = undefined;
    this.context = context;
    this.fncontext = undefined;
    this.fnoptions = undefined;
    this.fnscopeid = undefined;
    this.key = data && data.key;
    this.componentoptions = componentoptions;
    this.componentinstance = undefined;
    this.parent = undefined;
    this.raw = false;
    this.isstatic = false;
    this.isrootinsert = true;
    this.iscomment = false;
    this.iscloned = false;
    this.isonce = false;
    this.asyncfactory = asyncfactory;
    this.asyncmeta = undefined;
    this.isasyncplaceholder = false;
  };

  var prototypeaccessors = { child: { configurable: true } };

  // 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 (text) {
    if ( text === void 0 ) text = '';

    var node = new vnode();
    node.text = 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,
      // #7975
      // clone children array to avoid mutating original in case of cloning
      // a child.
      vnode.children && vnode.children.slice(),
      vnode.text,
      vnode.elm,
      vnode.context,
      vnode.componentoptions,
      vnode.asyncfactory
    );
    cloned.ns = vnode.ns;
    cloned.isstatic = vnode.isstatic;
    cloned.key = vnode.key;
    cloned.iscomment = vnode.iscomment;
    cloned.fncontext = vnode.fncontext;
    cloned.fnoptions = vnode.fnoptions;
    cloned.fnscopeid = vnode.fnscopeid;
    cloned.asyncmeta = vnode.asyncmeta;
    cloned.iscloned = true;
    return cloned
  }

  /*
   * 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);

  var methodstopatch = [
    'push',
    'pop',
    'shift',
    'unshift',
    'splice',
    'sort',
    'reverse'
  ];

  /**
   * intercept mutating methods and emit events
   */
  methodstopatch.foreach(function (method) {
    // cache original method
    var original = arrayproto[method];
    def(arraymethods, method, function mutator () {
      var args = [], len = arguments.length;
      while ( len-- ) args[ len ] = arguments[ len ];

      var result = original.apply(this, args);
      var ob = this.__ob__;
      var inserted;
      switch (method) {
        case 'push':
        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);

  /**
   * in some cases we may want to disable observation inside a component's
   * update computation.
   */
  var shouldobserve = true;

  function toggleobserving (value) {
    shouldobserve = value;
  }

  /**
   * observer class that is attached to each observed
   * object. once attached, the observer converts the target
   * object's property keys into getter/setters that
   * collect dependencies and dispatch updates.
   */
  var observer = function observer (value) {
    this.value = value;
    this.dep = new dep();
    this.vmcount = 0;
    def(value, '__ob__', this);
    if (array.isarray(value)) {
      if (hasproto) {
        protoaugment(value, arraymethods);
      } else {
        copyaugment(value, arraymethods, arraykeys);
      }
      this.observearray(value);
    } else {
      this.walk(value);
    }
  };

  /**
   * walk through all properties 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]);
    }
  };

  /**
   * 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 a 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 a 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) || value instanceof vnode) {
      return
    }
    var ob;
    if (hasown(value, '__ob__') && value.__ob__ instanceof observer) {
      ob = value.__ob__;
    } else if (
      shouldobserve &&
      !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,
    shallow
  ) {
    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;
    if ((!getter || setter) && arguments.length === 2) {
      val = obj[key];
    }

    var childob = !shallow && 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 (customsetter) {
          customsetter();
        }
        // #7981: for accessor properties without setter
        if (getter && !setter) { return }
        if (setter) {
          setter.call(obj, newval);
        } else {
          val = newval;
        }
        childob = !shallow && 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 (isundef(target) || isprimitive(target)
    ) {
      warn(("cannot set reactive property on undefined, null, or primitive value: " + ((target))));
    }
    if (array.isarray(target) && isvalidarrayindex(key)) {
      target.length = math.max(target.length, key);
      target.splice(key, 1, val);
      return val
    }
    if (key in target && !(key in object.prototype)) {
      target[key] = val;
      return val
    }
    var ob = (target).__ob__;
    if (target._isvue || (ob && ob.vmcount)) {
      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 (isundef(target) || isprimitive(target)
    ) {
      warn(("cannot delete reactive property on undefined, null, or primitive value: " + ((target))));
    }
    if (array.isarray(target) && isvalidarrayindex(key)) {
      target.splice(key, 1);
      return
    }
    var ob = (target).__ob__;
    if (target._isvue || (ob && ob.vmcount)) {
      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 = hassymbol
      ? reflect.ownkeys(from)
      : object.keys(from);

    for (var i = 0; i < keys.length; i++) {
      key = keys[i];
      // in case the object is already observed...
      if (key === '__ob__') { continue }
      toval = to[key];
      fromval = from[key];
      if (!hasown(to, key)) {
        set(to, key, fromval);
      } else if (
        toval !== fromval &&
        isplainobject(toval) &&
        isplainobject(fromval)
      ) {
        mergedata(toval, fromval);
      }
    }
    return to
  }

  /**
   * data
   */
  function mergedataorfn (
    parentval,
    childval,
    vm
  ) {
    if (!vm) {
      // in a vue.extend merge, both should be functions
      if (!childval) {
        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(
          typeof childval === 'function' ? childval.call(this, this) : childval,
          typeof parentval === 'function' ? parentval.call(this, this) : parentval
        )
      }
    } else {
      return function mergedinstancedatafn () {
        // instance merge
        var instancedata = typeof childval === 'function'
          ? childval.call(vm, vm)
          : childval;
        var defaultdata = typeof parentval === 'function'
          ? parentval.call(vm, vm)
          : parentval;
        if (instancedata) {
          return mergedata(instancedata, defaultdata)
        } else {
          return defaultdata
        }
      }
    }
  }

  strats.data = function (
    parentval,
    childval,
    vm
  ) {
    if (!vm) {
      if (childval && typeof childval !== 'function') {
        warn(
          'the "data" option should be a function ' +
          'that returns a per-instance value in component ' +
          'definitions.',
          vm
        );

        return parentval
      }
      return mergedataorfn(parentval, childval)
    }

    return mergedataorfn(parentval, childval, vm)
  };

  /**
   * hooks and props are merged as arrays.
   */
  function mergehook (
    parentval,
    childval
  ) {
    var res = childval
      ? parentval
        ? parentval.concat(childval)
        : array.isarray(childval)
          ? childval
          : [childval]
      : parentval;
    return res
      ? dedupehooks(res)
      : res
  }

  function dedupehooks (hooks) {
    var res = [];
    for (var i = 0; i < hooks.length; i++) {
      if (res.indexof(hooks[i]) === -1) {
        res.push(hooks[i]);
      }
    }
    return res
  }

  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,
    vm,
    key
  ) {
    var res = object.create(parentval || null);
    if (childval) {
      assertobjecttype(key, childval, vm);
      return extend(res, childval)
    } else {
      return 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,
    vm,
    key
  ) {
    // work around firefox's object.prototype.watch...
    if (parentval === nativewatch) { parentval = undefined; }
    if (childval === nativewatch) { childval = undefined; }
    /* istanbul ignore if */
    if (!childval) { return object.create(parentval || null) }
    {
      assertobjecttype(key, childval, vm);
    }
    if (!parentval) { return childval }
    var ret = {};
    extend(ret, parentval);
    for (var key$1 in childval) {
      var parent = ret[key$1];
      var child = childval[key$1];
      if (parent && !array.isarray(parent)) {
        parent = [parent];
      }
      ret[key$1] = parent
        ? parent.concat(child)
        : array.isarray(child) ? child : [child];
    }
    return ret
  };

  /**
   * other object hashes.
   */
  strats.props =
  strats.methods =
  strats.inject =
  strats.computed = function (
    parentval,
    childval,
    vm,
    key
  ) {
    if (childval && "development" !== 'production') {
      assertobjecttype(key, childval, vm);
    }
    if (!parentval) { return childval }
    var ret = object.create(null);
    extend(ret, parentval);
    if (childval) { extend(ret, childval); }
    return ret
  };
  strats.provide = mergedataorfn;

  /**
   * default strategy.
   */
  var defaultstrat = function (parentval, childval) {
    return childval === undefined
      ? parentval
      : childval
  };

  /**
   * validate component names
   */
  function checkcomponents (options) {
    for (var key in options.components) {
      validatecomponentname(key);
    }
  }

  function validatecomponentname (name) {
    if (!new regexp(("^[a-za-z][\\-\\.0-9_" + (unicoderegexp.source) + "]*$")).test(name)) {
      warn(
        'invalid component name: "' + name + '". component names ' +
        'should conform to valid custom element name in html5 specification.'
      );
    }
    if (isbuiltintag(name) || config.isreservedtag(name)) {
      warn(
        'do not use built-in or reserved html elements as component ' +
        'id: ' + name
      );
    }
  }

  /**
   * ensure all props option syntax are normalized into the
   * object-based format.
   */
  function normalizeprops (options, vm) {
    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 };
      }
    } else {
      warn(
        "invalid value for option \"props\": expected an array or an object, " +
        "but got " + (torawtype(props)) + ".",
        vm
      );
    }
    options.props = res;
  }

  /**
   * normalize all injections into object-based format
   */
  function normalizeinject (options, vm) {
    var inject = options.inject;
    if (!inject) { return }
    var normalized = options.inject = {};
    if (array.isarray(inject)) {
      for (var i = 0; i < inject.length; i++) {
        normalized[inject[i]] = { from: inject[i] };
      }
    } else if (isplainobject(inject)) {
      for (var key in inject) {
        var val = inject[key];
        normalized[key] = isplainobject(val)
          ? extend({ from: key }, val)
          : { from: val };
      }
    } else {
      warn(
        "invalid value for option \"inject\": expected an array or an object, " +
        "but got " + (torawtype(inject)) + ".",
        vm
      );
    }
  }

  /**
   * normalize raw function directives into object format.
   */
  function normalizedirectives (options) {
    var dirs = options.directives;
    if (dirs) {
      for (var key in dirs) {
        var def$$1 = dirs[key];
        if (typeof def$$1 === 'function') {
          dirs[key] = { bind: def$$1, update: def$$1 };
        }
      }
    }
  }

  function assertobjecttype (name, value, vm) {
    if (!isplainobject(value)) {
      warn(
        "invalid value for option \"" + name + "\": expected an object, " +
        "but got " + (torawtype(value)) + ".",
        vm
      );
    }
  }

  /**
   * 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, vm);
    normalizeinject(child, vm);
    normalizedirectives(child);

    // apply extends and mixins on the child options,
    // but only if it is a raw options object that isn't
    // the result of another mergeoptions call.
    // only merged options has the _base property.
    if (!child._base) {
      if (child.extends) {
        parent = mergeoptions(parent, child.extends, 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 (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];
    // boolean casting
    var booleanindex = gettypeindex(boolean, prop.type);
    if (booleanindex > -1) {
      if (absent && !hasown(prop, 'default')) {
        value = false;
      } else if (value === '' || value === hyphenate(key)) {
        // only cast empty string / same name to boolean if
        // boolean has higher priority
        var stringindex = gettypeindex(string, prop.type);
        if (stringindex < 0 || booleanindex < stringindex) {
          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 prevshouldobserve = shouldobserve;
      toggleobserving(true);
      observe(value);
      toggleobserving(prevshouldobserve);
    }
    {
      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 (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(
        getinvalidtypemessage(name, value, expectedtypes),
        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)) {
      var t = typeof value;
      valid = t === expectedtype.tolowercase();
      // for primitive wrapper objects
      if (!valid && t === 'object') {
        valid = value instanceof type;
      }
    } 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 issametype (a, b) {
    return gettype(a) === gettype(b)
  }

  function gettypeindex (type, expectedtypes) {
    if (!array.isarray(expectedtypes)) {
      return issametype(expectedtypes, type) ? 0 : -1
    }
    for (var i = 0, len = expectedtypes.length; i < len; i++) {
      if (issametype(expectedtypes[i], type)) {
        return i
      }
    }
    return -1
  }

  function getinvalidtypemessage (name, value, expectedtypes) {
    var message = "invalid prop: type check failed for prop \"" + name + "\"." +
      " expected " + (expectedtypes.map(capitalize).join(', '));
    var expectedtype = expectedtypes[0];
    var receivedtype = torawtype(value);
    var expectedvalue = stylevalue(value, expectedtype);
    var receivedvalue = stylevalue(value, receivedtype);
    // check if we need to specify expected value
    if (expectedtypes.length === 1 &&
        isexplicable(expectedtype) &&
        !isboolean(expectedtype, receivedtype)) {
      message += " with value " + expectedvalue;
    }
    message += ", got " + receivedtype + " ";
    // check if we need to specify received value
    if (isexplicable(receivedtype)) {
      message += "with value " + receivedvalue + ".";
    }
    return message
  }

  function stylevalue (value, type) {
    if (type === 'string') {
      return ("\"" + value + "\"")
    } else if (type === 'number') {
      return ("" + (number(value)))
    } else {
      return ("" + value)
    }
  }

  function isexplicable (value) {
    var explicittypes = ['string', 'number', 'boolean'];
    return explicittypes.some(function (elem) { return value.tolowercase() === elem; })
  }

  function isboolean () {
    var args = [], len = arguments.length;
    while ( len-- ) args[ len ] = arguments[ len ];

    return args.some(function (elem) { return elem.tolowercase() === 'boolean'; })
  }

  /*  */

  function handleerror (err, vm, info) {
    // deactivate deps tracking while processing error handler to avoid possible infinite rendering.
    pushtarget();
    try {
      if (vm) {
        var cur = vm;
        while ((cur = cur.$parent)) {
          var hooks = cur.$options.errorcaptured;
          if (hooks) {
            for (var i = 0; i < hooks.length; i++) {
              try {
                var capture = hooks[i].call(cur, err, vm, info) === false;
                if (capture) { return }
              } catch (e) {
                globalhandleerror(e, cur, 'errorcaptured hook');
              }
            }
          }
        }
      }
      globalhandleerror(err, vm, info);
    } finally {
      poptarget();
    }
  }

  function invokewitherrorhandling (
    handler,
    context,
    args,
    vm,
    info
  ) {
    var res;
    try {
      res = args ? handler.apply(context, args) : handler.call(context);
      if (res && !res._isvue && ispromise(res) && !res._handled) {
        res.catch(function (e) { return handleerror(e, vm, info + " (promise/async)"); });
        // issue #9511
        // avoid catch triggering multiple times when nested calls
        res._handled = true;
      }
    } catch (e) {
      handleerror(e, vm, info);
    }
    return res
  }

  function globalhandleerror (err, vm, info) {
    if (config.errorhandler) {
      try {
        return config.errorhandler.call(null, err, vm, info)
      } catch (e) {
        // if the user intentionally throws the original error in the handler,
        // do not log it twice
        if (e !== err) {
          logerror(e, null, 'config.errorhandler');
        }
      }
    }
    logerror(err, vm, info);
  }

  function logerror (err, vm, info) {
    {
      warn(("error in " + info + ": \"" + (err.tostring()) + "\""), vm);
    }
    /* istanbul ignore else */
    if ((inbrowser || inweex) && typeof console !== 'undefined') {
      console.error(err);
    } else {
      throw err
    }
  }

  /*  */

  var isusingmicrotask = false;

  var callbacks = [];
  var pending = false;

  function flushcallbacks () {
    pending = false;
    var copies = callbacks.slice(0);
    callbacks.length = 0;
    for (var i = 0; i < copies.length; i++) {
      copies[i]();
    }
  }

  // here we have async deferring wrappers using microtasks.
  // in 2.5 we used (macro) tasks (in combination with microtasks).
  // however, it has subtle problems when state is changed right before repaint
  // (e.g. #6813, out-in transitions).
  // also, using (macro) tasks in event handler would cause some weird behaviors
  // that cannot be circumvented (e.g. #7109, #7153, #7546, #7834, #8109).
  // so we now use microtasks everywhere, again.
  // a major drawback of this tradeoff is that there are some scenarios
  // where microtasks have too high a priority and fire in between supposedly
  // sequential events (e.g. #4521, #6690, which have workarounds)
  // or even between bubbling of the same event (#6566).
  var timerfunc;

  // 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 next, $flow-disable-line */
  if (typeof promise !== 'undefined' && isnative(promise)) {
    var p = promise.resolve();
    timerfunc = function () {
      p.then(flushcallbacks);
      // 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); }
    };
    isusingmicrotask = true;
  } else if (!isie && 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, ios7, android 4.4
    // (#6466 mutationobserver is unreliable in ie11)
    var counter = 1;
    var observer = new mutationobserver(flushcallbacks);
    var textnode = document.createtextnode(string(counter));
    observer.observe(textnode, {
      characterdata: true
    });
    timerfunc = function () {
      counter = (counter + 1) % 2;
      textnode.data = string(counter);
    };
    isusingmicrotask = true;
  } else if (typeof setimmediate !== 'undefined' && isnative(setimmediate)) {
    // fallback to setimmediate.
    // techinically it leverages the (macro) task queue,
    // but it is still a better choice than settimeout.
    timerfunc = function () {
      setimmediate(flushcallbacks);
    };
  } else {
    // fallback to settimeout.
    timerfunc = function () {
      settimeout(flushcallbacks, 0);
    };
  }

  function nexttick (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();
    }
    // $flow-disable-line
    if (!cb && typeof promise !== 'undefined') {
      return new promise(function (resolve) {
        _resolve = resolve;
      })
    }
  }

  /*  */

  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 that this property is reactive, ' +
        'either in the data option, or for class-based components, by ' +
        'initializing the property. ' +
        'see: ',
        target
      );
    };

    var warnreservedprefix = function (target, key) {
      warn(
        "property \"" + key + "\" must be accessed with \"$data." + key + "\" because " +
        'properties starting with "$" or "_" are not proxied in the vue instance to ' +
        'prevent conflicts with vue internals' +
        'see: ',
        target
      );
    };

    var hasproxy =
      typeof proxy !== 'undefined' && isnative(proxy);

    if (hasproxy) {
      var isbuiltinmodifier = makemap('stop,prevent,self,ctrl,shift,alt,meta,exact');
      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) ||
          (typeof key === 'string' && key.charat(0) === '_' && !(key in target.$data));
        if (!has && !isallowed) {
          if (key in target.$data) { warnreservedprefix(target, key); }
          else { warnnonpresent(target, key); }
        }
        return has || !isallowed
      }
    };

    var gethandler = {
      get: function get (target, key) {
        if (typeof key === 'string' && !(key in target)) {
          if (key in target.$data) { warnreservedprefix(target, key); }
          else { 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 seenobjects = new _set();

  /**
   * recursively traverse an object to evoke all converted
   * getters, so that every nested property inside the object
   * is collected as a "deep" dependency.
   */
  function traverse (val) {
    _traverse(val, seenobjects);
    seenobjects.clear();
  }

  function _traverse (val, seen) {
    var i, keys;
    var isa = array.isarray(val);
    if ((!isa && !isobject(val)) || object.isfrozen(val) || val instanceof vnode) {
      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 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, vm) {
    function invoker () {
      var arguments$1 = arguments;

      var fns = invoker.fns;
      if (array.isarray(fns)) {
        var cloned = fns.slice();
        for (var i = 0; i < cloned.length; i++) {
          invokewitherrorhandling(cloned[i], null, arguments$1, vm, "v-on handler");
        }
      } else {
        // return handler return value for single handlers
        return invokewitherrorhandling(fns, null, arguments, vm, "v-on handler")
      }
    }
    invoker.fns = fns;
    return invoker
  }

  function updatelisteners (
    on,
    oldon,
    add,
    remove$$1,
    createoncehandler,
    vm
  ) {
    var name, def$$1, cur, old, event;
    for (name in on) {
      def$$1 = cur = on[name];
      old = oldon[name];
      event = normalizeevent(name);
      if (isundef(cur)) {
        warn(
          "invalid handler for event \"" + (event.name) + "\": got " + string(cur),
          vm
        );
      } else if (isundef(old)) {
        if (isundef(cur.fns)) {
          cur = on[name] = createfninvoker(cur, vm);
        }
        if (istrue(event.once)) {
          cur = on[name] = createoncehandler(event.name, cur, event.capture);
        }
        add(event.name, cur, event.capture, event.passive, event.params);
      } else if (cur !== old) {
        old.fns = cur;
        on[name] = old;
      }
    }
    for (name in oldon) {
      if (isundef(on[name])) {
        event = normalizeevent(name);
        remove$$1(event.name, oldon[name], event.capture);
      }
    }
  }

  /*  */

  function mergevnodehook (def, hookkey, hook) {
    if (def instanceof vnode) {
      def = def.data.hook || (def.data.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 istextnode (node) {
    return isdef(node) && isdef(node.text) && isfalse(node.iscomment)
  }

  function normalizearraychildren (children, nestedindex) {
    var res = [];
    var i, c, lastindex, last;
    for (i = 0; i < children.length; i++) {
      c = children[i];
      if (isundef(c) || typeof c === 'boolean') { continue }
      lastindex = res.length - 1;
      last = res[lastindex];
      //  nested
      if (array.isarray(c)) {
        if (c.length > 0) {
          c = normalizearraychildren(c, ((nestedindex || '') + "_" + i));
          // merge adjacent text nodes
          if (istextnode(c[0]) && istextnode(last)) {
            res[lastindex] = createtextvnode(last.text + (c[0]).text);
            c.shift();
          }
          res.push.apply(res, c);
        }
      } else if (isprimitive(c)) {
        if (istextnode(last)) {
          // merge adjacent text nodes
          // this is necessary for ssr hydration because text nodes are
          // essentially merged when rendered to html strings
          res[lastindex] = createtextvnode(last.text + c);
        } else if (c !== '') {
          // convert primitive to vnode
          res.push(createtextvnode(c));
        }
      } else {
        if (istextnode(c) && istextnode(last)) {
          // merge adjacent text nodes
          res[lastindex] = createtextvnode(last.text + c.text);
        } else {
          // default key for nested array children (likely generated by v-for)
          if (istrue(children._isvlist) &&
            isdef(c.tag) &&
            isundef(c.key) &&
            isdef(nestedindex)) {
            c.key = "__vlist" + nestedindex + "_" + i + "__";
          }
          res.push(c);
        }
      }
    }
    return res
  }

  /*  */

  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) {
      toggleobserving(false);
      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
            );
          });
        }
      });
      toggleobserving(true);
    }
  }

  function resolveinject (inject, vm) {
    if (inject) {
      // inject is :any because flow is not smart enough to figure out cached
      var result = object.create(null);
      var keys = hassymbol
        ? reflect.ownkeys(inject)
        : object.keys(inject);

      for (var i = 0; i < keys.length; i++) {
        var key = keys[i];
        // #6574 in case the inject object is observed...
        if (key === '__ob__') { continue }
        var providekey = inject[key].from;
        var source = vm;
        while (source) {
          if (source._provided && hasown(source._provided, providekey)) {
            result[key] = source._provided[providekey];
            break
          }
          source = source.$parent;
        }
        if (!source) {
          if ('default' in inject[key]) {
            var providedefault = inject[key].default;
            result[key] = typeof providedefault === 'function'
              ? providedefault.call(vm)
              : providedefault;
          } else {
            warn(("injection \"" + key + "\" not found"), vm);
          }
        }
      }
      return result
    }
  }

  /*  */



  /**
   * runtime helper for resolving raw children vnodes into a slot object.
   */
  function resolveslots (
    children,
    context
  ) {
    if (!children || !children.length) {
      return {}
    }
    var slots = {};
    for (var i = 0, l = children.length; i < l; i++) {
      var child = children[i];
      var data = child.data;
      // remove slot attribute if the node is resolved as a vue slot node
      if (data && data.attrs && data.attrs.slot) {
        delete data.attrs.slot;
      }
      // named slots should only be respected if the vnode was rendered in the
      // same context.
      if ((child.context === context || child.fncontext === context) &&
        data && data.slot != null
      ) {
        var name = data.slot;
        var slot = (slots[name] || (slots[name] = []));
        if (child.tag === 'template') {
          slot.push.apply(slot, child.children || []);
        } else {
          slot.push(child);
        }
      } else {
        (slots.default || (slots.default = [])).push(child);
      }
    }
    // ignore slots that contains only whitespace
    for (var name$1 in slots) {
      if (slots[name$1].every(iswhitespace)) {
        delete slots[name$1];
      }
    }
    return slots
  }

  function iswhitespace (node) {
    return (node.iscomment && !node.asyncfactory) || node.text === ' '
  }

  /*  */

  function normalizescopedslots (
    slots,
    normalslots,
    prevslots
  ) {
    var res;
    var hasnormalslots = object.keys(normalslots).length > 0;
    var isstable = slots ? !!slots.$stable : !hasnormalslots;
    var key = slots && slots.$key;
    if (!slots) {
      res = {};
    } else if (slots._normalized) {
      // fast path 1: child component re-render only, parent did not change
      return slots._normalized
    } else if (
      isstable &&
      prevslots &&
      prevslots !== emptyobject &&
      key === prevslots.$key &&
      !hasnormalslots &&
      !prevslots.$hasnormal
    ) {
      // fast path 2: stable scoped slots w/ no normal slots to proxy,
      // only need to normalize once
      return prevslots
    } else {
      res = {};
      for (var key$1 in slots) {
        if (slots[key$1] && key$1[0] !== '$') {
          res[key$1] = normalizescopedslot(normalslots, key$1, slots[key$1]);
        }
      }
    }
    // expose normal slots on scopedslots
    for (var key$2 in normalslots) {
      if (!(key$2 in res)) {
        res[key$2] = proxynormalslot(normalslots, key$2);
      }
    }
    // avoriaz seems to mock a non-extensible $scopedslots object
    // and when that is passed down this would cause an error
    if (slots && object.isextensible(slots)) {
      (slots)._normalized = res;
    }
    def(res, '$stable', isstable);
    def(res, '$key', key);
    def(res, '$hasnormal', hasnormalslots);
    return res
  }

  function normalizescopedslot(normalslots, key, fn) {
    var normalized = function () {
      var res = arguments.length ? fn.apply(null, arguments) : fn({});
      res = res && typeof res === 'object' && !array.isarray(res)
        ? [res] // single vnode
        : normalizechildren(res);
      return res && (
        res.length === 0 ||
        (res.length === 1 && res[0].iscomment) // #9658
      ) ? undefined
        : res
    };
    // this is a slot using the new v-slot syntax without scope. although it is
    // compiled as a scoped slot, render fn users would expect it to be present
    // on this.$slots because the usage is semantically a normal slot.
    if (fn.proxy) {
      object.defineproperty(normalslots, key, {
        get: normalized,
        enumerable: true,
        configurable: true
      });
    }
    return normalized
  }

  function proxynormalslot(slots, key) {
    return function () { return slots[key]; }
  }

  /*  */

  /**
   * 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)) {
      if (hassymbol && val[symbol.iterator]) {
        ret = [];
        var iterator = val[symbol.iterator]();
        var result = iterator.next();
        while (!result.done) {
          ret.push(render(result.value, ret.length));
          result = iterator.next();
        }
      } else {
        keys = object.keys(val);
        ret = new array(keys.length);
        for (i = 0, l = keys.length; i < l; i++) {
          key = keys[i];
          ret[i] = render(val[key], key, i);
        }
      }
    }
    if (!isdef(ret)) {
      ret = [];
    }
    (ret)._isvlist = true;
    return ret
  }

  /*  */

  /**
   * runtime helper for rendering <slot>
   */
  function renderslot (
    name,
    fallback,
    props,
    bindobject
  ) {
    var scopedslotfn = this.$scopedslots[name];
    var nodes;
    if (scopedslotfn) { // scoped slot
      props = props || {};
      if (bindobject) {
        if (!isobject(bindobject)) {
          warn(
            'slot v-bind without argument expects an object',
            this
          );
        }
        props = extend(extend({}, bindobject), props);
      }
      nodes = scopedslotfn(props) || fallback;
    } else {
      nodes = this.$slots[name] || fallback;
    }

    var target = props && props.slot;
    if (target) {
      return this.$createelement('template', { slot: target }, nodes)
    } else {
      return nodes
    }
  }

  /*  */

  /**
   * runtime helper for resolving filters
   */
  function resolvefilter (id) {
    return resolveasset(this.$options, 'filters', id, true) || identity
  }

  /*  */

  function iskeynotmatch (expect, actual) {
    if (array.isarray(expect)) {
      return expect.indexof(actual) === -1
    } else {
      return expect !== actual
    }
  }

  /**
   * runtime helper for checking keycodes from config.
   * exposed as vue.prototype._k
   * passing in eventkeyname as last argument separately for backwards compat
   */
  function checkkeycodes (
    eventkeycode,
    key,
    builtinkeycode,
    eventkeyname,
    builtinkeyname
  ) {
    var mappedkeycode = config.keycodes[key] || builtinkeycode;
    if (builtinkeyname && eventkeyname && !config.keycodes[key]) {
      return iskeynotmatch(builtinkeyname, eventkeyname)
    } else if (mappedkeycode) {
      return iskeynotmatch(mappedkeycode, eventkeycode)
    } else if (eventkeyname) {
      return hyphenate(eventkeyname) !== key
    }
  }

  /*  */

  /**
   * runtime helper for merging v-bind="object" into a vnode's data.
   */
  function bindobjectprops (
    data,
    tag,
    value,
    asprop,
    issync
  ) {
    if (value) {
      if (!isobject(value)) {
        warn(
          'v-bind without argument expects an object or array value',
          this
        );
      } else {
        if (array.isarray(value)) {
          value = toobject(value);
        }
        var hash;
        var loop = function ( key ) {
          if (
            key === 'class' ||
            key === 'style' ||
            isreservedattribute(key)
          ) {
            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 = {});
          }
          var camelizedkey = camelize(key);
          var hyphenatedkey = hyphenate(key);
          if (!(camelizedkey in hash) && !(hyphenatedkey in hash)) {
            hash[key] = value[key];

            if (issync) {
              var on = data.on || (data.on = {});
              on[("update:" + key)] = function ($event) {
                value[key] = $event;
              };
            }
          }
        };

        for (var key in value) loop( key );
      }
    }
    return data
  }

  /*  */

  /**
   * runtime helper for rendering static trees.
   */
  function renderstatic (
    index,
    isinfor
  ) {
    var cached = this._statictrees || (this._statictrees = []);
    var tree = cached[index];
    // if has already-rendered static tree and not inside v-for,
    // we can reuse the same tree.
    if (tree && !isinfor) {
      return tree
    }
    // otherwise, render a fresh tree.
    tree = cached[index] = this.$options.staticrenderfns[index].call(
      this._renderproxy,
      null,
      this // for render fns generated for functional component templates
    );
    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 bindobjectlisteners (data, value) {
    if (value) {
      if (!isplainobject(value)) {
        warn(
          'v-on without argument expects an object value',
          this
        );
      } else {
        var on = data.on = data.on ? extend({}, data.on) : {};
        for (var key in value) {
          var existing = on[key];
          var ours = value[key];
          on[key] = existing ? [].concat(existing, ours) : ours;
        }
      }
    }
    return data
  }

  /*  */

  function resolvescopedslots (
    fns, // see flow/vnode
    res,
    // the following are added in 2.6
    hasdynamickeys,
    contenthashkey
  ) {
    res = res || { $stable: !hasdynamickeys };
    for (var i = 0; i < fns.length; i++) {
      var slot = fns[i];
      if (array.isarray(slot)) {
        resolvescopedslots(slot, res, hasdynamickeys);
      } else if (slot) {
        // marker for reverse proxying v-slot without scope on this.$slots
        if (slot.proxy) {
          slot.fn.proxy = true;
        }
        res[slot.key] = slot.fn;
      }
    }
    if (contenthashkey) {
      (res).$key = contenthashkey;
    }
    return res
  }

  /*  */

  function binddynamickeys (baseobj, values) {
    for (var i = 0; i < values.length; i += 2) {
      var key = values[i];
      if (typeof key === 'string' && key) {
        baseobj[values[i]] = values[i + 1];
      } else if (key !== '' && key !== null) {
        // null is a speical value for explicitly removing a binding
        warn(
          ("invalid value for dynamic directive argument (expected string or null): " + key),
          this
        );
      }
    }
    return baseobj
  }

  // helper to dynamically append modifier runtime markers to event names.
  // ensure only append when value is already string, otherwise it will be cast
  // to string and cause the type check to miss.
  function prependmodifier (value, symbol) {
    return typeof value === 'string' ? symbol + value : value
  }

  /*  */

  function installrenderhelpers (target) {
    target._o = markonce;
    target._n = tonumber;
    target._s = tostring;
    target._l = renderlist;
    target._t = renderslot;
    target._q = looseequal;
    target._i = looseindexof;
    target._m = renderstatic;
    target._f = resolvefilter;
    target._k = checkkeycodes;
    target._b = bindobjectprops;
    target._v = createtextvnode;
    target._e = createemptyvnode;
    target._u = resolvescopedslots;
    target._g = bindobjectlisteners;
    target._d = binddynamickeys;
    target._p = prependmodifier;
  }

  /*  */

  function functionalrendercontext (
    data,
    props,
    children,
    parent,
    ctor
  ) {
    var this$1 = this;

    var options = ctor.options;
    // ensure the createelement function in functional components
    // gets a unique context - this is necessary for correct named slot check
    var contextvm;
    if (hasown(parent, '_uid')) {
      contextvm = object.create(parent);
      // $flow-disable-line
      contextvm._original = parent;
    } else {
      // the context vm passed in is a functional context as well.
      // in this case we want to make sure we are able to get a hold to the
      // real context instance.
      contextvm = parent;
      // $flow-disable-line
      parent = parent._original;
    }
    var iscompiled = istrue(options._compiled);
    var neednormalization = !iscompiled;

    this.data = data;
    this.props = props;
    this.children = children;
    this.parent = parent;
    this.listeners = data.on || emptyobject;
    this.injections = resolveinject(options.inject, parent);
    this.slots = function () {
      if (!this$1.$slots) {
        normalizescopedslots(
          data.scopedslots,
          this$1.$slots = resolveslots(children, parent)
        );
      }
      return this$1.$slots
    };

    object.defineproperty(this, 'scopedslots', ({
      enumerable: true,
      get: function get () {
        return normalizescopedslots(data.scopedslots, this.slots())
      }
    }));

    // support for compiled functional template
    if (iscompiled) {
      // exposing $options for renderstatic()
      this.$options = options;
      // pre-resolve slots for renderslot()
      this.$slots = this.slots();
      this.$scopedslots = normalizescopedslots(data.scopedslots, this.$slots);
    }

    if (options._scopeid) {
      this._c = function (a, b, c, d) {
        var vnode = createelement(contextvm, a, b, c, d, neednormalization);
        if (vnode && !array.isarray(vnode)) {
          vnode.fnscopeid = options._scopeid;
          vnode.fncontext = parent;
        }
        return vnode
      };
    } else {
      this._c = function (a, b, c, d) { return createelement(contextvm, a, b, c, d, neednormalization); };
    }
  }

  installrenderhelpers(functionalrendercontext.prototype);

  function createfunctionalcomponent (
    ctor,
    propsdata,
    data,
    contextvm,
    children
  ) {
    var options = ctor.options;
    var props = {};
    var propoptions = options.props;
    if (isdef(propoptions)) {
      for (var key in propoptions) {
        props[key] = validateprop(key, propoptions, propsdata || emptyobject);
      }
    } else {
      if (isdef(data.attrs)) { mergeprops(props, data.attrs); }
      if (isdef(data.props)) { mergeprops(props, data.props); }
    }

    var rendercontext = new functionalrendercontext(
      data,
      props,
      children,
      contextvm,
      ctor
    );

    var vnode = options.render.call(null, rendercontext._c, rendercontext);

    if (vnode instanceof vnode) {
      return cloneandmarkfunctionalresult(vnode, data, rendercontext.parent, options, rendercontext)
    } else if (array.isarray(vnode)) {
      var vnodes = normalizechildren(vnode) || [];
      var res = new array(vnodes.length);
      for (var i = 0; i < vnodes.length; i++) {
        res[i] = cloneandmarkfunctionalresult(vnodes[i], data, rendercontext.parent, options, rendercontext);
      }
      return res
    }
  }

  function cloneandmarkfunctionalresult (vnode, data, contextvm, options, rendercontext) {
    // #7817 clone node before setting fncontext, otherwise if the node is reused
    // (e.g. it was from a cached normal slot) the fncontext causes named slots
    // that should not be matched to match.
    var clone = clonevnode(vnode);
    clone.fncontext = contextvm;
    clone.fnoptions = options;
    {
      (clone.devtoolsmeta = clone.devtoolsmeta || {}).rendercontext = rendercontext;
    }
    if (data.slot) {
      (clone.data || (clone.data = {})).slot = data.slot;
    }
    return clone
  }

  function mergeprops (to, from) {
    for (var key in from) {
      to[camelize(key)] = from[key];
    }
  }

  /*  */

  /*  */

  /*  */

  /*  */

  // inline hooks to be invoked on component vnodes during patch
  var componentvnodehooks = {
    init: function init (vnode, hydrating) {
      if (
        vnode.componentinstance &&
        !vnode.componentinstance._isdestroyed &&
        vnode.data.keepalive
      ) {
        // kept-alive components, treat as a patch
        var mountednode = vnode; // work around flow
        componentvnodehooks.prepatch(mountednode, mountednode);
      } else {
        var child = vnode.componentinstance = createcomponentinstanceforvnode(
          vnode,
          activeinstance
        );
        child.$mount(hydrating ? vnode.elm : undefined, hydrating);
      }
    },

    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
    var asyncfactory;
    if (isundef(ctor.cid)) {
      asyncfactory = ctor;
      ctor = resolveasynccomponent(asyncfactory, basector);
      if (ctor === undefined) {
        // return a placeholder node for async component, which is rendered
        // as a comment node but preserves all the raw information for the node.
        // the information will be used for async server-rendering and hydration.
        return createasyncplaceholder(
          asyncfactory,
          data,
          context,
          children,
          tag
        )
      }
    }

    data = data || {};

    // resolve constructor options in case global mixins are applied after
    // component constructor creation
    resolveconstructoroptions(ctor);

    // transform component v-model data into props & events
    if (isdef(data.model)) {
      transformmodel(ctor.options, data);
    }

    // extract props
    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
    // so it gets processed during parent component patch.
    data.on = data.nativeon;

    if (istrue(ctor.options.abstract)) {
      // abstract components do not keep anything
      // other than props & listeners & slot

      // work around flow
      var slot = data.slot;
      data = {};
      if (slot) {
        data.slot = slot;
      }
    }

    // install component management hooks onto the placeholder node
    installcomponenthooks(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 },
      asyncfactory
    );

    return vnode
  }

  function createcomponentinstanceforvnode (
    vnode, // we know it's mountedcomponentvnode but flow doesn't
    parent // activeinstance in lifecycle state
  ) {
    var options = {
      _iscomponent: true,
      _parentvnode: vnode,
      parent: parent
    };
    // check inline-template render functions
    var inlinetemplate = vnode.data.inlinetemplate;
    if (isdef(inlinetemplate)) {
      options.render = inlinetemplate.render;
      options.staticrenderfns = inlinetemplate.staticrenderfns;
    }
    return new vnode.componentoptions.ctor(options)
  }

  function installcomponenthooks (data) {
    var hooks = data.hook || (data.hook = {});
    for (var i = 0; i < hookstomerge.length; i++) {
      var key = hookstomerge[i];
      var existing = hooks[key];
      var tomerge = componentvnodehooks[key];
      if (existing !== tomerge && !(existing && existing._merged)) {
        hooks[key] = existing ? mergehook$1(tomerge, existing) : tomerge;
      }
    }
  }

  function mergehook$1 (f1, f2) {
    var merged = function (a, b) {
      // flow complains about extra args which is why we use any
      f1(a, b);
      f2(a, b);
    };
    merged._merged = true;
    return merged
  }

  // 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.attrs || (data.attrs = {}))[prop] = data.model.value;
    var on = data.on || (data.on = {});
    var existing = on[event];
    var callback = data.model.callback;
    if (isdef(existing)) {
      if (
        array.isarray(existing)
          ? existing.indexof(callback) === -1
          : existing !== callback
      ) {
        on[event] = [callback].concat(existing);
      }
    } else {
      on[event] = 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__)) {
      warn(
        "avoid using observed data object as vnode data: " + (json.stringify(data)) + "\n" +
        'always create fresh vnode data objects in each render!',
        context
      );
      return createemptyvnode()
    }
    // object syntax in v-bind
    if (isdef(data) && isdef(data.is)) {
      tag = data.is;
    }
    if (!tag) {
      // in case of component :is set to falsy value
      return createemptyvnode()
    }
    // warn against non-primitive key
    if (isdef(data) && isdef(data.key) && !isprimitive(data.key)
    ) {
      {
        warn(
          'avoid using non-primitive value as key, ' +
          'use string/number value instead.',
          context
        );
      }
    }
    // support single function children as default scoped slot
    if (array.isarray(children) &&
      typeof children[0] === 'function'
    ) {
      data = data || {};
      data.scopedslots = { default: children[0] };
      children.length = 0;
    }
    if (normalizationtype === always_normalize) {
      children = normalizechildren(children);
    } else if (normalizationtype === simple_normalize) {
      children = simplenormalizechildren(children);
    }
    var vnode, ns;
    if (typeof tag === 'string') {
      var ctor;
      ns = (context.$vnode && context.$vnode.ns) || config.gettagnamespace(tag);
      if (config.isreservedtag(tag)) {
        // platform built-in elements
        vnode = new vnode(
          config.parseplatformtagname(tag), data, children,
          undefined, undefined, context
        );
      } else if ((!data || !data.pre) && isdef(ctor = resolveasset(context.$options, 'components', tag))) {
        // component
        vnode = createcomponent(ctor, data, context, children, tag);
      } else {
        // unknown or unlisted namespaced elements
        // check at runtime because it may get assigned a namespace when its
        // parent normalizes children
        vnode = new vnode(
          tag, data, children,
          undefined, undefined, context
        );
      }
    } else {
      // direct component options / constructor
      vnode = createcomponent(tag, data, context, children);
    }
    if (array.isarray(vnode)) {
      return vnode
    } else if (isdef(vnode)) {
      if (isdef(ns)) { applyns(vnode, ns); }
      if (isdef(data)) { registerdeepbindings(data); }
      return vnode
    } else {
      return createemptyvnode()
    }
  }

  function applyns (vnode, ns, force) {
    vnode.ns = ns;
    if (vnode.tag === 'foreignobject') {
      // use default namespace inside foreignobject
      ns = undefined;
      force = true;
    }
    if (isdef(vnode.children)) {
      for (var i = 0, l = vnode.children.length; i < l; i++) {
        var child = vnode.children[i];
        if (isdef(child.tag) && (
          isundef(child.ns) || (istrue(force) && child.tag !== 'svg'))) {
          applyns(child, ns, force);
        }
      }
    }
  }

  // ref #5318
  // necessary to ensure parent re-render when deep bindings like :style and
  // :class are used on slot nodes
  function registerdeepbindings (data) {
    if (isobject(data.style)) {
      traverse(data.style);
    }
    if (isobject(data.class)) {
      traverse(data.class);
    }
  }

  /*  */

  function initrender (vm) {
    vm._vnode = null; // the root of the child tree
    vm._statictrees = null; // v-once cached trees
    var options = vm.$options;
    var parentvnode = vm.$vnode = options._parentvnode; // the placeholder node in parent tree
    var rendercontext = parentvnode && parentvnode.context;
    vm.$slots = resolveslots(options._renderchildren, rendercontext);
    vm.$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); };

    // $attrs & $listeners are exposed for easier hoc creation.
    // they need to be reactive so that hocs using them are always updated
    var parentdata = parentvnode && parentvnode.data;

    /* istanbul ignore else */
    {
      definereactive$$1(vm, '$attrs', parentdata && parentdata.attrs || emptyobject, function () {
        !isupdatingchildcomponent && warn("$attrs is readonly.", vm);
      }, true);
      definereactive$$1(vm, '$listeners', options._parentlisteners || emptyobject, function () {
        !isupdatingchildcomponent && warn("$listeners is readonly.", vm);
      }, true);
    }
  }

  var currentrenderinginstance = null;

  function rendermixin (vue) {
    // install runtime convenience helpers
    installrenderhelpers(vue.prototype);

    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 _parentvnode = ref._parentvnode;

      if (_parentvnode) {
        vm.$scopedslots = normalizescopedslots(
          _parentvnode.data.scopedslots,
          vm.$slots,
          vm.$scopedslots
        );
      }

      // set parent vnode. this allows render functions to have access
      // to the data on the placeholder node.
      vm.$vnode = _parentvnode;
      // render self
      var vnode;
      try {
        // there's no need to maintain a stack becaues all render fns are called
        // separately from one another. nested component's render fns are called
        // when parent component is patched.
        currentrenderinginstance = vm;
        vnode = render.call(vm._renderproxy, vm.$createelement);
      } catch (e) {
        handleerror(e, vm, "render");
        // return error render result,
        // or previous vnode to prevent render error causing blank component
        /* istanbul ignore else */
        if (vm.$options.rendererror) {
          try {
            vnode = vm.$options.rendererror.call(vm._renderproxy, vm.$createelement, e);
          } catch (e) {
            handleerror(e, vm, "rendererror");
            vnode = vm._vnode;
          }
        } else {
          vnode = vm._vnode;
        }
      } finally {
        currentrenderinginstance = null;
      }
      // if the returned array contains only a single node, allow it
      if (array.isarray(vnode) && vnode.length === 1) {
        vnode = vnode[0];
      }
      // return empty vnode in case the render function errored out
      if (!(vnode instanceof vnode)) {
        if (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
    };
  }

  /*  */

  function ensurector (comp, base) {
    if (
      comp.__esmodule ||
      (hassymbol && comp[symbol.tostringtag] === 'module')
    ) {
      comp = comp.default;
    }
    return isobject(comp)
      ? base.extend(comp)
      : comp
  }

  function createasyncplaceholder (
    factory,
    data,
    context,
    children,
    tag
  ) {
    var node = createemptyvnode();
    node.asyncfactory = factory;
    node.asyncmeta = { data: data, context: context, children: children, tag: tag };
    return node
  }

  function resolveasynccomponent (
    factory,
    basector
  ) {
    if (istrue(factory.error) && isdef(factory.errorcomp)) {
      return factory.errorcomp
    }

    if (isdef(factory.resolved)) {
      return factory.resolved
    }

    var owner = currentrenderinginstance;
    if (owner && isdef(factory.owners) && factory.owners.indexof(owner) === -1) {
      // already pending
      factory.owners.push(owner);
    }

    if (istrue(factory.loading) && isdef(factory.loadingcomp)) {
      return factory.loadingcomp
    }

    if (owner && !isdef(factory.owners)) {
      var owners = factory.owners = [owner];
      var sync = true;
      var timerloading = null;
      var timertimeout = null

      ;(owner).$on('hook:destroyed', function () { return remove(owners, owner); });

      var forcerender = function (rendercompleted) {
        for (var i = 0, l = owners.length; i < l; i++) {
          (owners[i]).$forceupdate();
        }

        if (rendercompleted) {
          owners.length = 0;
          if (timerloading !== null) {
            cleartimeout(timerloading);
            timerloading = null;
          }
          if (timertimeout !== null) {
            cleartimeout(timertimeout);
            timertimeout = null;
          }
        }
      };

      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(true);
        } else {
          owners.length = 0;
        }
      });

      var reject = once(function (reason) {
        warn(
          "failed to resolve async component: " + (string(factory)) +
          (reason ? ("\nreason: " + reason) : '')
        );
        if (isdef(factory.errorcomp)) {
          factory.error = true;
          forcerender(true);
        }
      });

      var res = factory(resolve, reject);

      if (isobject(res)) {
        if (ispromise(res)) {
          // () => promise
          if (isundef(factory.resolved)) {
            res.then(resolve, reject);
          }
        } else if (ispromise(res.component)) {
          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 {
              timerloading = settimeout(function () {
                timerloading = null;
                if (isundef(factory.resolved) && isundef(factory.error)) {
                  factory.loading = true;
                  forcerender(false);
                }
              }, res.delay || 200);
            }
          }

          if (isdef(res.timeout)) {
            timertimeout = settimeout(function () {
              timertimeout = null;
              if (isundef(factory.resolved)) {
                reject(
                  "timeout (" + (res.timeout) + "ms)"
                );
              }
            }, res.timeout);
          }
        }
      }

      sync = false;
      // return in case resolved synchronously
      return factory.loading
        ? factory.loadingcomp
        : factory.resolved
    }
  }

  /*  */

  function isasyncplaceholder (node) {
    return node.iscomment && node.asyncfactory
  }

  /*  */

  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) || isasyncplaceholder(c))) {
          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) {
    target.$on(event, fn);
  }

  function remove$1 (event, fn) {
    target.$off(event, fn);
  }

  function createoncehandler (event, fn) {
    var _target = target;
    return function oncehandler () {
      var res = fn.apply(null, arguments);
      if (res !== null) {
        _target.$off(event, oncehandler);
      }
    }
  }

  function updatecomponentlisteners (
    vm,
    listeners,
    oldlisteners
  ) {
    target = vm;
    updatelisteners(listeners, oldlisteners || {}, add, remove$1, createoncehandler, vm);
    target = undefined;
  }

  function eventsmixin (vue) {
    var hookre = /^hook:/;
    vue.prototype.$on = function (event, fn) {
      var vm = this;
      if (array.isarray(event)) {
        for (var i = 0, l = event.length; i < l; i++) {
          vm.$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 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$1++) {
          vm.$off(event[i$1], fn);
        }
        return vm
      }
      // specific event
      var cbs = vm._events[event];
      if (!cbs) {
        return vm
      }
      if (!fn) {
        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);
        var info = "event handler for \"" + event + "\"";
        for (var i = 0, l = cbs.length; i < l; i++) {
          invokewitherrorhandling(cbs[i], vm, args, vm, info);
        }
      }
      return vm
    };
  }

  /*  */

  var activeinstance = null;
  var isupdatingchildcomponent = false;

  function setactiveinstance(vm) {
    var prevactiveinstance = activeinstance;
    activeinstance = vm;
    return function () {
      activeinstance = prevactiveinstance;
    }
  }

  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;
      var prevel = vm.$el;
      var prevvnode = vm._vnode;
      var restoreactiveinstance = setactiveinstance(vm);
      vm._vnode = vnode;
      // vue.prototype.__patch__ is injected in entry points
      // based on the rendering backend used.
      if (!prevvnode) {
        // initial render
        vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeonly */);
      } else {
        // updates
        vm.$el = vm.__patch__(prevvnode, vnode);
      }
      restoreactiveinstance();
      // 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.$el.__vue__ = null;
      }
      // release circular reference (#6759)
      if (vm.$vnode) {
        vm.$vnode.parent = 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 (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(("vue " + name + " render"), starttag, endtag);

        mark(starttag);
        vm._update(vnode, hydrating);
        mark(endtag);
        measure(("vue " + name + " patch"), starttag, endtag);
      };
    } else {
      updatecomponent = function () {
        vm._update(vm._render(), hydrating);
      };
    }

    // we set this to vm._watcher inside the watcher's constructor
    // since the watcher's initial patch may call $forceupdate (e.g. inside child
    // component's mounted hook), which relies on vm._watcher being already defined
    new watcher(vm, updatecomponent, noop, {
      before: function before () {
        if (vm._ismounted && !vm._isdestroyed) {
          callhook(vm, 'beforeupdate');
        }
      }
    }, true /* isrenderwatcher */);
    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
  ) {
    {
      isupdatingchildcomponent = true;
    }

    // determine whether component has slot children
    // we need to do this before overwriting $options._renderchildren.

    // check if there are dynamic scopedslots (hand-written or compiled but with
    // dynamic slot names). static scoped slots compiled from template has the
    // "$stable" marker.
    var newscopedslots = parentvnode.data.scopedslots;
    var oldscopedslots = vm.$scopedslots;
    var hasdynamicscopedslot = !!(
      (newscopedslots && !newscopedslots.$stable) ||
      (oldscopedslots !== emptyobject && !oldscopedslots.$stable) ||
      (newscopedslots && vm.$scopedslots.$key !== newscopedslots.$key)
    );

    // any static slot children from the parent may have changed during parent's
    // update. dynamic scoped slots may also have changed. in such cases, a forced
    // update is necessary to ensure correctness.
    var needsforceupdate = !!(
      renderchildren ||               // has new static slots
      vm.$options._renderchildren ||  // has old static slots
      hasdynamicscopedslot
    );

    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 $attrs and $listeners hash
    // these are also reactive so they may trigger child update if the child
    // used them during render
    vm.$attrs = parentvnode.data.attrs || emptyobject;
    vm.$listeners = listeners || emptyobject;

    // update props
    if (propsdata && vm.$options.props) {
      toggleobserving(false);
      var props = vm._props;
      var propkeys = vm.$options._propkeys || [];
      for (var i = 0; i < propkeys.length; i++) {
        var key = propkeys[i];
        var propoptions = vm.$options.props; // wtf flow?
        props[key] = validateprop(key, propoptions, propsdata, vm);
      }
      toggleobserving(true);
      // keep a copy of raw propsdata
      vm.$options.propsdata = propsdata;
    }

    // update listeners
    listeners = listeners || emptyobject;
    var oldlisteners = vm.$options._parentlisteners;
    vm.$options._parentlisteners = listeners;
    updatecomponentlisteners(vm, listeners, oldlisteners);

    // resolve slots + force update if has children
    if (needsforceupdate) {
      vm.$slots = resolveslots(renderchildren, parentvnode.context);
      vm.$forceupdate();
    }

    {
      isupdatingchildcomponent = false;
    }
  }

  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) {
    // #7573 disable dep collection when invoking lifecycle hooks
    pushtarget();
    var handlers = vm.$options[hook];
    var info = hook + " hook";
    if (handlers) {
      for (var i = 0, j = handlers.length; i < j; i++) {
        invokewitherrorhandling(handlers[i], vm, null, vm, info);
      }
    }
    if (vm._hashookevent) {
      vm.$emit('hook:' + hook);
    }
    poptarget();
  }

  /*  */

  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 () {
    index = queue.length = activatedchildren.length = 0;
    has = {};
    {
      circular = {};
    }
    waiting = flushing = false;
  }

  // async edge case #6566 requires saving the timestamp when event listeners are
  // attached. however, calling performance.now() has a perf overhead especially
  // if the page has thousands of event listeners. instead, we take a timestamp
  // every time the scheduler flushes and use that for all event listeners
  // attached during that flush.
  var currentflushtimestamp = 0;

  // async edge case fix requires storing an event listener's attach timestamp.
  var getnow = date.now;

  // determine what event timestamp the browser is using. annoyingly, the
  // timestamp can either be hi-res (relative to page load) or low-res
  // (relative to unix epoch), so in order to compare time we have to use the
  // same timestamp type when saving the flush timestamp.
  // all ie versions use low-res event timestamps, and have problematic clock
  // implementations (#9632)
  if (inbrowser && !isie) {
    var performance = window.performance;
    if (
      performance &&
      typeof performance.now === 'function' &&
      getnow() > document.createevent('event').timestamp
    ) {
      // if the event timestamp, although evaluated after the date.now(), is
      // smaller than it, it means the event is using a hi-res timestamp,
      // and we need to use the hi-res version for event listener timestamps as
      // well.
      getnow = function () { return performance.now(); };
    }
  }

  /**
   * flush both queues and run the watchers.
   */
  function flushschedulerqueue () {
    currentflushtimestamp = getnow();
    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];
      if (watcher.before) {
        watcher.before();
      }
      id = watcher.id;
      has[id] = null;
      watcher.run();
      // in dev build, check and stop circular updates.
      if (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);
    callupdatedhooks(updatedqueue);

    // devtool hook
    /* istanbul ignore if */
    if (devtools && config.devtools) {
      devtools.emit('flush');
    }
  }

  function callupdatedhooks (queue) {
    var i = queue.length;
    while (i--) {
      var watcher = queue[i];
      var vm = watcher.vm;
      if (vm._watcher === watcher && vm._ismounted && !vm._isdestroyed) {
        callhook(vm, 'updated');
      }
    }
  }

  /**
   * queue a kept-alive component that was activated during patch.
   * the queue will be processed after the entire tree has been patched.
   */
  function queueactivatedcomponent (vm) {
    // setting _inactive to false here so that a render function can
    // rely on checking whether it's in an inactive tree (e.g. router-view)
    vm._inactive = false;
    activatedchildren.push(vm);
  }

  function callactivatedhooks (queue) {
    for (var i = 0; i < queue.length; i++) {
      queue[i]._inactive = true;
      activatechildcomponent(queue[i], true /* true */);
    }
  }

  /**
   * push a watcher into the watcher queue.
   * jobs with duplicate ids will be skipped unless it's
   * pushed when the queue is being flushed.
   */
  function queuewatcher (watcher) {
    var id = watcher.id;
    if (has[id] == null) {
      has[id] = true;
      if (!flushing) {
        queue.push(watcher);
      } else {
        // if already flushing, splice the watcher based on its id
        // if already past its id, it will be run next immediately.
        var i = queue.length - 1;
        while (i > index && queue[i].id > watcher.id) {
          i--;
        }
        queue.splice(i + 1, 0, watcher);
      }
      // queue the flush
      if (!waiting) {
        waiting = true;

        if (!config.async) {
          flushschedulerqueue();
          return
        }
        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,
    isrenderwatcher
  ) {
    this.vm = vm;
    if (isrenderwatcher) {
      vm._watcher = this;
    }
    vm._watchers.push(this);
    // options
    if (options) {
      this.deep = !!options.deep;
      this.user = !!options.user;
      this.lazy = !!options.lazy;
      this.sync = !!options.sync;
      this.before = options.before;
    } 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 = noop;
        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;
    try {
      value = this.getter.call(vm, vm);
    } catch (e) {
      if (this.user) {
        handleerror(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
      } else {
        throw e
      }
    } finally {
      // "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 i = this.deps.length;
    while (i--) {
      var dep = this.deps[i];
      if (!this.newdepids.has(dep.id)) {
        dep.removesub(this);
      }
    }
    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 i = this.deps.length;
    while (i--) {
      this.deps[i].depend();
    }
  };

  /**
   * remove self from all dependencies' subscriber list.
   */
  watcher.prototype.teardown = function teardown () {
    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.deps[i].removesub(this);
      }
      this.active = false;
    }
  };

  /*  */

  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 && opts.watch !== nativewatch) {
      initwatch(vm, opts.watch);
    }
  }

  function initprops (vm, propsoptions) {
    var propsdata = vm.$options.propsdata || {};
    var props = vm._props = {};
    // cache prop keys so that future props updates can iterate using array
    // instead of dynamic object key enumeration.
    var keys = vm.$options._propkeys = [];
    var isroot = !vm.$parent;
    // root instance props should be converted
    if (!isroot) {
      toggleobserving(false);
    }
    var loop = function ( key ) {
      keys.push(key);
      var value = validateprop(key, propsoptions, propsdata, vm);
      /* istanbul ignore else */
      {
        var hyphenatedkey = hyphenate(key);
        if (isreservedattribute(hyphenatedkey) ||
            config.isreservedattr(hyphenatedkey)) {
          warn(
            ("\"" + hyphenatedkey + "\" is a reserved attribute and cannot be used as component prop."),
            vm
          );
        }
        definereactive$$1(props, key, value, function () {
          if (!isroot && !isupdatingchildcomponent) {
            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 );
    toggleobserving(true);
  }

  function initdata (vm) {
    var data = vm.$options.data;
    data = vm._data = typeof data === 'function'
      ? getdata(data, vm)
      : data || {};
    if (!isplainobject(data)) {
      data = {};
      warn(
        'data functions should return an object:\n' +
        ' ',
        vm
      );
    }
    // proxy data on instance
    var keys = object.keys(data);
    var props = vm.$options.props;
    var methods = vm.$options.methods;
    var i = keys.length;
    while (i--) {
      var key = keys[i];
      {
        if (methods && hasown(methods, key)) {
          warn(
            ("method \"" + key + "\" has already been defined as a data property."),
            vm
          );
        }
      }
      if (props && hasown(props, key)) {
        warn(
          "the data property \"" + key + "\" is already declared as a prop. " +
          "use prop default value instead.",
          vm
        );
      } else if (!isreserved(key)) {
        proxy(vm, "_data", key);
      }
    }
    // observe data
    observe(data, true /* asrootdata */);
  }

  function getdata (data, vm) {
    // #7573 disable dep collection when invoking data getters
    pushtarget();
    try {
      return data.call(vm, vm)
    } catch (e) {
      handleerror(e, vm, "data()");
      return {}
    } finally {
      poptarget();
    }
  }

  var computedwatcheroptions = { lazy: true };

  function initcomputed (vm, computed) {
    // $flow-disable-line
    var watchers = vm._computedwatchers = object.create(null);
    // computed properties are just getters during ssr
    var isssr = isserverrendering();

    for (var key in computed) {
      var userdef = computed[key];
      var getter = typeof userdef === 'function' ? userdef : userdef.get;
      if (getter == null) {
        warn(
          ("getter is missing for computed property \"" + key + "\"."),
          vm
        );
      }

      if (!isssr) {
        // create internal watcher for the computed property.
        watchers[key] = new watcher(
          vm,
          getter || noop,
          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
  ) {
    var shouldcache = !isserverrendering();
    if (typeof userdef === 'function') {
      sharedpropertydefinition.get = shouldcache
        ? createcomputedgetter(key)
        : creategetterinvoker(userdef);
      sharedpropertydefinition.set = noop;
    } else {
      sharedpropertydefinition.get = userdef.get
        ? shouldcache && userdef.cache !== false
          ? createcomputedgetter(key)
          : creategetterinvoker(userdef.get)
        : noop;
      sharedpropertydefinition.set = userdef.set || noop;
    }
    if (sharedpropertydefinition.set === noop) {
      sharedpropertydefinition.set = function () {
        warn(
          ("computed property \"" + key + "\" was assigned to but it has no setter."),
          this
        );
      };
    }
    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 creategetterinvoker(fn) {
    return function computedgetter () {
      return fn.call(this, this)
    }
  }

  function initmethods (vm, methods) {
    var props = vm.$options.props;
    for (var key in methods) {
      {
        if (typeof methods[key] !== 'function') {
          warn(
            "method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" 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
          );
        }
        if ((key in vm) && isreserved(key)) {
          warn(
            "method \"" + key + "\" conflicts with an existing vue instance method. " +
            "avoid defining component methods that start with _ or $."
          );
        }
      }
      vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], 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,
    exporfn,
    handler,
    options
  ) {
    if (isplainobject(handler)) {
      options = handler;
      handler = handler.handler;
    }
    if (typeof handler === 'string') {
      handler = vm[handler];
    }
    return vm.$watch(exporfn, 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 () {
        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;
      if (isplainobject(cb)) {
        return createwatcher(vm, exporfn, cb, options)
      }
      options = options || {};
      options.user = true;
      var watcher = new watcher(vm, exporfn, cb, options);
      if (options.immediate) {
        try {
          cb.call(vm, watcher.value);
        } catch (error) {
          handleerror(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
        }
      }
      return function unwatchfn () {
        watcher.teardown();
      }
    };
  }

  /*  */

  var uid$3 = 0;

  function initmixin (vue) {
    vue.prototype._init = function (options) {
      var vm = this;
      // a uid
      vm._uid = uid$3++;

      var starttag, endtag;
      /* istanbul ignore if */
      if (config.performance && mark) {
        starttag = "vue-perf-start:" + (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 (config.performance && mark) {
        vm._name = formatcomponentname(vm, false);
        mark(endtag);
        measure(("vue " + (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.
    var parentvnode = options._parentvnode;
    opts.parent = options.parent;
    opts._parentvnode = parentvnode;

    var vnodecomponentoptions = parentvnode.componentoptions;
    opts.propsdata = vnodecomponentoptions.propsdata;
    opts._parentlisteners = vnodecomponentoptions.listeners;
    opts._renderchildren = vnodecomponentoptions.children;
    opts._componenttag = vnodecomponentoptions.tag;

    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 sealed = ctor.sealedoptions;
    for (var key in latest) {
      if (latest[key] !== sealed[key]) {
        if (!modified) { modified = {}; }
        modified[key] = latest[key];
      }
    }
    return modified
  }

  function vue (options) {
    if (!(this instanceof vue)
    ) {
      warn('vue is a constructor and should be called with the `new` keyword');
    }
    this._init(options);
  }

  initmixin(vue);
  statemixin(vue);
  eventsmixin(vue);
  lifecyclemixin(vue);
  rendermixin(vue);

  /*  */

  function inituse (vue) {
    vue.use = function (plugin) {
      var installedplugins = (this._installedplugins || (this._installedplugins = []));
      if (installedplugins.indexof(plugin) > -1) {
        return this
      }

      // additional parameters
      var args = toarray(arguments, 1);
      args.unshift(this);
      if (typeof plugin.install === 'function') {
        plugin.install.apply(plugin, args);
      } else if (typeof plugin === 'function') {
        plugin.apply(null, args);
      }
      installedplugins.push(plugin);
      return this
    };
  }

  /*  */

  function initmixin$1 (vue) {
    vue.mixin = function (mixin) {
      this.options = mergeoptions(this.options, mixin);
      return this
    };
  }

  /*  */

  function initextend (vue) {
    /**
     * each instance constructor, including vue, has a unique
     * cid. this enables us to create wrapped "child
     * constructors" for prototypal inheritance and cache them.
     */
    vue.cid = 0;
    var cid = 1;

    /**
     * class inheritance
     */
    vue.extend = function (extendoptions) {
      extendoptions = extendoptions || {};
      var super = this;
      var superid = super.cid;
      var cachedctors = extendoptions._ctor || (extendoptions._ctor = {});
      if (cachedctors[superid]) {
        return cachedctors[superid]
      }

      var name = extendoptions.name || super.options.name;
      if (name) {
        validatecomponentname(name);
      }

      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') {
            validatecomponentname(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
        }
      };
    });
  }

  /*  */



  function getcomponentname (opts) {
    return opts && (opts.ctor.options.name || opts.tag)
  }

  function matches (pattern, name) {
    if (array.isarray(pattern)) {
      return pattern.indexof(name) > -1
    } else 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 (keepaliveinstance, filter) {
    var cache = keepaliveinstance.cache;
    var keys = keepaliveinstance.keys;
    var _vnode = keepaliveinstance._vnode;
    for (var key in cache) {
      var cachednode = cache[key];
      if (cachednode) {
        var name = getcomponentname(cachednode.componentoptions);
        if (name && !filter(name)) {
          prunecacheentry(cache, key, keys, _vnode);
        }
      }
    }
  }

  function prunecacheentry (
    cache,
    key,
    keys,
    current
  ) {
    var cached$$1 = cache[key];
    if (cached$$1 && (!current || cached$$1.tag !== current.tag)) {
      cached$$1.componentinstance.$destroy();
    }
    cache[key] = null;
    remove(keys, key);
  }

  var patterntypes = [string, regexp, array];

  var keepalive = {
    name: 'keep-alive',
    abstract: true,

    props: {
      include: patterntypes,
      exclude: patterntypes,
      max: [string, number]
    },

    created: function created () {
      this.cache = object.create(null);
      this.keys = [];
    },

    destroyed: function destroyed () {
      for (var key in this.cache) {
        prunecacheentry(this.cache, key, this.keys);
      }
    },

    mounted: function mounted () {
      var this$1 = this;

      this.$watch('include', function (val) {
        prunecache(this$1, function (name) { return matches(val, name); });
      });
      this.$watch('exclude', function (val) {
        prunecache(this$1, function (name) { return !matches(val, name); });
      });
    },

    render: function render () {
      var slot = this.$slots.default;
      var vnode = getfirstcomponentchild(slot);
      var componentoptions = vnode && vnode.componentoptions;
      if (componentoptions) {
        // check pattern
        var name = getcomponentname(componentoptions);
        var ref = this;
        var include = ref.include;
        var exclude = ref.exclude;
        if (
          // not included
          (include && (!name || !matches(include, name))) ||
          // excluded
          (exclude && name && matches(exclude, name))
        ) {
          return vnode
        }

        var ref$1 = this;
        var cache = ref$1.cache;
        var keys = ref$1.keys;
        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 (cache[key]) {
          vnode.componentinstance = cache[key].componentinstance;
          // make current key freshest
          remove(keys, key);
          keys.push(key);
        } else {
          cache[key] = vnode;
          keys.push(key);
          // prune oldest entry
          if (this.max && keys.length > parseint(this.max)) {
            prunecacheentry(cache, keys[0], keys, this._vnode);
          }
        }

        vnode.data.keepalive = true;
      }
      return vnode || (slot && slot[0])
    }
  };

  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;

    // 2.6 explicit observable api
    vue.observable = function (obj) {
      observe(obj);
      return obj
    };

    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);

  object.defineproperty(vue.prototype, '$isserver', {
    get: isserverrendering
  });

  object.defineproperty(vue.prototype, '$ssrcontext', {
    get: function get () {
      /* istanbul ignore next */
      return this.$vnode && this.$vnode.ssrcontext
    }
  });

  // expose functionalrendercontext for ssr runtime helper installation
  object.defineproperty(vue, 'functionalrendercontext', {
    value: functionalrendercontext
  });

  vue.version = '2.6.10';

  /*  */

  // 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,progress');
  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 isvalidcontenteditablevalue = makemap('events,caret,typing,plaintext-only');

  var convertenumeratedvalue = function (key, value) {
    return isfalsyattrvalue(value) || value === 'false'
      ? 'false'
      // allow arbitrary string value for contenteditable
      : key === 'contenteditable' && isvalidcontenteditablevalue(value)
        ? value
        : 'true'
  };

  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 && childnode.data) {
        data = mergeclassdata(childnode.data, data);
      }
    }
    while (isdef(parentnode = parentnode.parent)) {
      if (parentnode && parentnode.data) {
        data = mergeclassdata(data, parentnode.data);
      }
    }
    return renderclass(data.staticclass, data.class)
  }

  function mergeclassdata (child, parent) {
    return {
      staticclass: concat(child.staticclass, parent.staticclass),
      class: isdef(child.class)
        ? [child.class, parent.class]
        : parent.class
    }
  }

  function renderclass (
    staticclass,
    dynamicclass
  ) {
    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 (array.isarray(value)) {
      return stringifyarray(value)
    }
    if (isobject(value)) {
      return stringifyobject(value)
    }
    if (typeof value === 'string') {
      return value
    }
    /* istanbul ignore next */
    return ''
  }

  function stringifyarray (value) {
    var res = '';
    var stringified;
    for (var i = 0, l = value.length; i < l; i++) {
      if (isdef(stringified = stringifyclass(value[i])) && stringified !== '') {
        if (res) { res += ' '; }
        res += stringified;
      }
    }
    return res
  }

  function stringifyobject (value) {
    var res = '';
    for (var key in value) {
      if (value[key]) {
        if (res) { res += ' '; }
        res += key;
      }
    }
    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,picture,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,blockquote,iframe,tfoot'
  );

  // 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) {
      return (unknownelementcache[tag] = (
        el.constructor === window.htmlunknownelement ||
        el.constructor === window.htmlelement
      ))
    } else {
      return (unknownelementcache[tag] = /htmlunknownelement/.test(el.tostring()))
    }
  }

  var istextinputtype = makemap('text,number,password,search,email,tel,url');

  /*  */

  /**
   * 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) {
        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 setstylescope (node, scopeid) {
    node.setattribute(scopeid, '');
  }

  var nodeops = /*#__pure__*/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,
    setstylescope: setstylescope
  });

  /*  */

  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 (!isdef(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] = [ref];
        } else if (refs[key].indexof(ref) < 0) {
          // $flow-disable-line
          refs[key].push(ref);
        }
      } else {
        refs[key] = ref;
      }
    }
  }

  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)
        ) || (
          istrue(a.isasyncplaceholder) &&
          a.asyncfactory === b.asyncfactory &&
          isundef(b.asyncfactory.error)
        )
      )
    )
  }

  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 || istextinputtype(typea) && istextinputtype(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);
      }
    }

    function isunknownelement$$1 (vnode, invpre) {
      return (
        !invpre &&
        !vnode.ns &&
        !(
          config.ignoredelements.length &&
          config.ignoredelements.some(function (ignore) {
            return isregexp(ignore)
              ? ignore.test(vnode.tag)
              : ignore === vnode.tag
          })
        ) &&
        config.isunknownelement(vnode.tag)
      )
    }

    var creatingelminvpre = 0;

    function createelm (
      vnode,
      insertedvnodequeue,
      parentelm,
      refelm,
      nested,
      ownerarray,
      index
    ) {
      if (isdef(vnode.elm) && isdef(ownerarray)) {
        // this vnode was used in a previous render!
        // now it's used as a new node, overwriting its elm would cause
        // potential patch errors down the road when it's used as an insertion
        // reference node. instead, we clone the node on-demand before creating
        // associated dom element for it.
        vnode = ownerarray[index] = clonevnode(vnode);
      }

      vnode.isrootinsert = !nested; // for transition enter check
      if (createcomponent(vnode, insertedvnodequeue, parentelm, refelm)) {
        return
      }

      var data = vnode.data;
      var children = vnode.children;
      var tag = vnode.tag;
      if (isdef(tag)) {
        {
          if (data && data.pre) {
            creatingelminvpre++;
          }
          if (isunknownelement$$1(vnode, creatingelminvpre)) {
            warn(
              'unknown custom element: <' + tag + '> - did you ' +
              'register the component correctly? for recursive components, ' +
              'make sure to provide the "name" option.',
              vnode.context
            );
          }
        }

        vnode.elm = vnode.ns
          ? nodeops.createelementns(vnode.ns, tag)
          : nodeops.createelement(tag, vnode);
        setscope(vnode);

        /* istanbul ignore if */
        {
          createchildren(vnode, children, insertedvnodequeue);
          if (isdef(data)) {
            invokecreatehooks(vnode, insertedvnodequeue);
          }
          insert(parentelm, vnode.elm, refelm);
        }

        if (data && data.pre) {
          creatingelminvpre--;
        }
      } else if (istrue(vnode.iscomment)) {
        vnode.elm = nodeops.createcomment(vnode.text);
        insert(parentelm, vnode.elm, refelm);
      } else {
        vnode.elm = nodeops.createtextnode(vnode.text);
        insert(parentelm, vnode.elm, refelm);
      }
    }

    function createcomponent (vnode, insertedvnodequeue, parentelm, refelm) {
      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 */);
        }
        // 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);
          insert(parentelm, vnode.elm, refelm);
          if (istrue(isreactivated)) {
            reactivatecomponent(vnode, insertedvnodequeue, parentelm, refelm);
          }
          return true
        }
      }
    }

    function initcomponent (vnode, insertedvnodequeue) {
      if (isdef(vnode.data.pendinginsert)) {
        insertedvnodequeue.push.apply(insertedvnodequeue, vnode.data.pendinginsert);
        vnode.data.pendinginsert = null;
      }
      vnode.elm = vnode.componentinstance.$el;
      if (ispatchable(vnode)) {
        invokecreatehooks(vnode, insertedvnodequeue);
        setscope(vnode);
      } else {
        // empty component root.
        // skip all element-related modules except for ref (#3455)
        registerref(vnode);
        // make sure to invoke the insert hook
        insertedvnodequeue.push(vnode);
      }
    }

    function reactivatecomponent (vnode, insertedvnodequeue, parentelm, refelm) {
      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$$1) {
      if (isdef(parent)) {
        if (isdef(ref$$1)) {
          if (nodeops.parentnode(ref$$1) === parent) {
            nodeops.insertbefore(parent, elm, ref$$1);
          }
        } else {
          nodeops.appendchild(parent, elm);
        }
      }
    }

    function createchildren (vnode, children, insertedvnodequeue) {
      if (array.isarray(children)) {
        {
          checkduplicatekeys(children);
        }
        for (var i = 0; i < children.length; ++i) {
          createelm(children[i], insertedvnodequeue, vnode.elm, null, true, children, i);
        }
      } else if (isprimitive(vnode.text)) {
        nodeops.appendchild(vnode.elm, nodeops.createtextnode(string(vnode.text)));
      }
    }

    function ispatchable (vnode) {
      while (vnode.componentinstance) {
        vnode = vnode.componentinstance._vnode;
      }
      return isdef(vnode.tag)
    }

    function invokecreatehooks (vnode, insertedvnodequeue) {
      for (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;
      if (isdef(i = vnode.fnscopeid)) {
        nodeops.setstylescope(vnode.elm, i);
      } else {
        var ancestor = vnode;
        while (ancestor) {
          if (isdef(i = ancestor.context) && isdef(i = i.$options._scopeid)) {
            nodeops.setstylescope(vnode.elm, i);
          }
          ancestor = ancestor.parent;
        }
      }
      // for slot content they should also get the scopeid from the host instance.
      if (isdef(i = activeinstance) &&
        i !== vnode.context &&
        i !== vnode.fncontext &&
        isdef(i = i.$options._scopeid)
      ) {
        nodeops.setstylescope(vnode.elm, i);
      }
    }

    function addvnodes (parentelm, refelm, vnodes, startidx, endidx, insertedvnodequeue) {
      for (; startidx <= endidx; ++startidx) {
        createelm(vnodes[startidx], insertedvnodequeue, parentelm, refelm, false, vnodes, startidx);
      }
    }

    function invokedestroyhook (vnode) {
      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, vnodetomove, 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;

      {
        checkduplicatekeys(newch);
      }

      while (oldstartidx <= oldendidx && newstartidx <= newendidx) {
        if (isundef(oldstartvnode)) {
          oldstartvnode = oldch[++oldstartidx]; // vnode has been moved left
        } else if (isundef(oldendvnode)) {
          oldendvnode = oldch[--oldendidx];
        } else if (samevnode(oldstartvnode, newstartvnode)) {
          patchvnode(oldstartvnode, newstartvnode, insertedvnodequeue, newch, newstartidx);
          oldstartvnode = oldch[++oldstartidx];
          newstartvnode = newch[++newstartidx];
        } else if (samevnode(oldendvnode, newendvnode)) {
          patchvnode(oldendvnode, newendvnode, insertedvnodequeue, newch, newendidx);
          oldendvnode = oldch[--oldendidx];
          newendvnode = newch[--newendidx];
        } else if (samevnode(oldstartvnode, newendvnode)) { // vnode moved right
          patchvnode(oldstartvnode, newendvnode, insertedvnodequeue, newch, newendidx);
          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, newch, newstartidx);
          canmove && nodeops.insertbefore(parentelm, oldendvnode.elm, oldstartvnode.elm);
          oldendvnode = oldch[--oldendidx];
          newstartvnode = newch[++newstartidx];
        } else {
          if (isundef(oldkeytoidx)) { oldkeytoidx = createkeytooldidx(oldch, oldstartidx, oldendidx); }
          idxinold = isdef(newstartvnode.key)
            ? oldkeytoidx[newstartvnode.key]
            : findidxinold(newstartvnode, oldch, oldstartidx, oldendidx);
          if (isundef(idxinold)) { // new element
            createelm(newstartvnode, insertedvnodequeue, parentelm, oldstartvnode.elm, false, newch, newstartidx);
          } else {
            vnodetomove = oldch[idxinold];
            if (samevnode(vnodetomove, newstartvnode)) {
              patchvnode(vnodetomove, newstartvnode, insertedvnodequeue, newch, newstartidx);
              oldch[idxinold] = undefined;
              canmove && nodeops.insertbefore(parentelm, vnodetomove.elm, oldstartvnode.elm);
            } else {
              // same key but different element. treat as new element
              createelm(newstartvnode, insertedvnodequeue, parentelm, oldstartvnode.elm, false, newch, newstartidx);
            }
          }
          newstartvnode = newch[++newstartidx];
        }
      }
      if (oldstartidx > oldendidx) {
        refelm = isundef(newch[newendidx + 1]) ? null : newch[newendidx + 1].elm;
        addvnodes(parentelm, refelm, newch, newstartidx, newendidx, insertedvnodequeue);
      } else if (newstartidx > newendidx) {
        removevnodes(parentelm, oldch, oldstartidx, oldendidx);
      }
    }

    function checkduplicatekeys (children) {
      var seenkeys = {};
      for (var i = 0; i < children.length; i++) {
        var vnode = children[i];
        var key = vnode.key;
        if (isdef(key)) {
          if (seenkeys[key]) {
            warn(
              ("duplicate keys detected: '" + key + "'. this may cause an update error."),
              vnode.context
            );
          } else {
            seenkeys[key] = true;
          }
        }
      }
    }

    function findidxinold (node, oldch, start, end) {
      for (var i = start; i < end; i++) {
        var c = oldch[i];
        if (isdef(c) && samevnode(node, c)) { return i }
      }
    }

    function patchvnode (
      oldvnode,
      vnode,
      insertedvnodequeue,
      ownerarray,
      index,
      removeonly
    ) {
      if (oldvnode === vnode) {
        return
      }

      if (isdef(vnode.elm) && isdef(ownerarray)) {
        // clone reused vnode
        vnode = ownerarray[index] = clonevnode(vnode);
      }

      var elm = vnode.elm = oldvnode.elm;

      if (istrue(oldvnode.isasyncplaceholder)) {
        if (isdef(vnode.asyncfactory.resolved)) {
          hydrate(oldvnode.elm, vnode, insertedvnodequeue);
        } else {
          vnode.isasyncplaceholder = true;
        }
        return
      }

      // reuse element for static trees.
      // note we only do this if the vnode is cloned -
      // if the new node is not cloned it means the render functions have been
      // reset by the hot-reload-api and we need to do a proper re-render.
      if (istrue(vnode.isstatic) &&
        istrue(oldvnode.isstatic) &&
        vnode.key === oldvnode.key &&
        (istrue(vnode.iscloned) || istrue(vnode.isonce))
      ) {
        vnode.componentinstance = oldvnode.componentinstance;
        return
      }

      var i;
      var data = vnode.data;
      if (isdef(data) && isdef(i = data.hook) && isdef(i = i.prepatch)) {
        i(oldvnode, vnode);
      }

      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)) {
          {
            checkduplicatekeys(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 hydrationbailed = false;
    // list of modules that can skip create hook during hydration because they
    // are already rendered on the client or has no need for initialization
    // note: style is excluded because it relies on initial clone for future
    // deep updates (#7063).
    var isrenderedmodule = makemap('attrs,class,staticclass,staticstyle,key');

    // note: this is a browser-only function so we can assume elms are dom nodes.
    function hydrate (elm, vnode, insertedvnodequeue, invpre) {
      var i;
      var tag = vnode.tag;
      var data = vnode.data;
      var children = vnode.children;
      invpre = invpre || (data && data.pre);
      vnode.elm = elm;

      if (istrue(vnode.iscomment) && isdef(vnode.asyncfactory)) {
        vnode.isasyncplaceholder = true;
        return true
      }
      // assert node match
      {
        if (!assertnodematch(elm, vnode, invpre)) {
          return false
        }
      }
      if (isdef(data)) {
        if (isdef(i = data.hook) && isdef(i = i.init)) { i(vnode, true /* hydrating */); }
        if (isdef(i = vnode.componentinstance)) {
          // child component. it should have hydrated its own tree.
          initcomponent(vnode, insertedvnodequeue);
          return true
        }
      }
      if (isdef(tag)) {
        if (isdef(children)) {
          // empty element, allow client to pick up and populate children
          if (!elm.haschildnodes()) {
            createchildren(vnode, children, insertedvnodequeue);
          } else {
            // v-html and domprops: innerhtml
            if (isdef(i = data) && isdef(i = i.domprops) && isdef(i = i.innerhtml)) {
              if (i !== elm.innerhtml) {
                /* istanbul ignore if */
                if (typeof console !== 'undefined' &&
                  !hydrationbailed
                ) {
                  hydrationbailed = true;
                  console.warn('parent: ', elm);
                  console.warn('server innerhtml: ', i);
                  console.warn('client innerhtml: ', elm.innerhtml);
                }
                return false
              }
            } else {
              // iterate and compare children lists
              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, invpre)) {
                  childrenmatch = false;
                  break
                }
                childnode = childnode.nextsibling;
              }
              // if childnode is not null, it means the actual childnodes list is
              // longer than the virtual children list.
              if (!childrenmatch || childnode) {
                /* istanbul ignore if */
                if (typeof console !== 'undefined' &&
                  !hydrationbailed
                ) {
                  hydrationbailed = true;
                  console.warn('parent: ', elm);
                  console.warn('mismatching childnodes vs. vnodes: ', elm.childnodes, children);
                }
                return false
              }
            }
          }
        }
        if (isdef(data)) {
          var fullinvoke = false;
          for (var key in data) {
            if (!isrenderedmodule(key)) {
              fullinvoke = true;
              invokecreatehooks(vnode, insertedvnodequeue);
              break
            }
          }
          if (!fullinvoke && data['class']) {
            // ensure collecting deps for deep class bindings for future updates
            traverse(data['class']);
          }
        }
      } else if (elm.data !== vnode.text) {
        elm.data = vnode.text;
      }
      return true
    }

    function assertnodematch (node, vnode, invpre) {
      if (isdef(vnode.tag)) {
        return vnode.tag.indexof('vue-component') === 0 || (
          !isunknownelement$$1(vnode, invpre) &&
          vnode.tag.tolowercase() === (node.tagname && node.tagname.tolowercase())
        )
      } else {
        return node.nodetype === (vnode.iscomment ? 8 : 3)
      }
    }

    return function patch (oldvnode, vnode, hydrating, removeonly) {
      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);
      } else {
        var isrealelement = isdef(oldvnode.nodetype);
        if (!isrealelement && samevnode(oldvnode, vnode)) {
          // patch existing root node
          patchvnode(oldvnode, vnode, insertedvnodequeue, null, null, 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 = nodeops.parentnode(oldelm);

          // create new node
          createelm(
            vnode,
            insertedvnodequeue,
            // extremely rare edge case: do not insert if old element is in a
            // leaving transition. only happens when combining transition +
            // keep-alive + hocs. (#4590)
            oldelm._leavecb ? null : parentelm,
            nodeops.nextsibling(oldelm)
          );

          // update parent placeholder node element, recursively
          if (isdef(vnode.parent)) {
            var ancestor = vnode.parent;
            var patchable = ispatchable(vnode);
            while (ancestor) {
              for (var i = 0; i < cbs.destroy.length; ++i) {
                cbs.destroy[i](ancestor);
              }
              ancestor.elm = vnode.elm;
              if (patchable) {
                for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                  cbs.create[i$1](emptynode, ancestor);
                }
                // #6513
                // invoke insert hooks that may have been merged by create hooks.
                // e.g. for directives that uses the "inserted" hook.
                var insert = ancestor.data.hook.insert;
                if (insert.merged) {
                  // start at index 1 to avoid re-invoking component mounted hook
                  for (var i$2 = 1; i$2 < insert.fns.length; i$2++) {
                    insert.fns[i$2]();
                  }
                }
              } else {
                registerref(ancestor);
              }
              ancestor = ancestor.parent;
            }
          }

          // destroy old node
          if (isdef(parentelm)) {
            removevnodes(parentelm, [oldvnode], 0, 0);
          } else if (isdef(oldvnode.tag)) {
            invokedestroyhook(oldvnode);
          }
        }
      }

      invokeinserthook(vnode, insertedvnodequeue, isinitialpatch);
      return vnode.elm
    }
  }

  /*  */

  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;
        dir.oldarg = olddir.arg;
        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, 'insert', callinsert);
      } else {
        callinsert();
      }
    }

    if (dirswithpostpatch.length) {
      mergevnodehook(vnode, '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) {
      // $flow-disable-line
      return res
    }
    var i, dir;
    for (i = 0; i < dirs.length; i++) {
      dir = dirs[i];
      if (!dir.modifiers) {
        // $flow-disable-line
        dir.modifiers = emptymodifiers;
      }
      res[getrawdirname(dir)] = dir;
      dir.def = resolveasset(vm.$options, 'directives', dir.name, true);
    }
    // $flow-disable-line
    return res
  }

  function getrawdirname (dir) {
    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) {
    var opts = vnode.componentoptions;
    if (isdef(opts) && opts.ctor.options.inheritattrs === false) {
      return
    }
    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]
    // #6666: ie/edge forces progress value down to 1 before setting a max
    /* istanbul ignore if */
    if ((isie || isedge) && 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 (el.tagname.indexof('-') > -1) {
      basesetattr(el, key, value);
    } else if (isbooleanattr(key)) {
      // set attribute for blank value
      // e.g. <option disabled>select one</option>
      if (isfalsyattrvalue(value)) {
        el.removeattribute(key);
      } else {
        // technically allowfullscreen is a boolean attribute for <iframe>,
        // but flash expects a value of "true" when used on <embed> tag
        value = key === 'allowfullscreen' && el.tagname === 'embed'
          ? 'true'
          : key;
        el.setattribute(key, value);
      }
    } else if (isenumeratedattr(key)) {
      el.setattribute(key, convertenumeratedvalue(key, value));
    } else if (isxlink(key)) {
      if (isfalsyattrvalue(value)) {
        el.removeattributens(xlinkns, getxlinkprop(key));
      } else {
        el.setattributens(xlinkns, key, value);
      }
    } else {
      basesetattr(el, key, value);
    }
  }

  function basesetattr (el, key, value) {
    if (isfalsyattrvalue(value)) {
      el.removeattribute(key);
    } else {
      // #7138: ie10 & 11 fires input event when setting placeholder on
      // <textarea>... block the first input event and remove the blocker
      // immediately.
      /* istanbul ignore if */
      if (
        isie && !isie9 &&
        el.tagname === 'textarea' &&
        key === 'placeholder' && value !== '' && !el.__ieph
      ) {
        var blocker = function (e) {
          e.stopimmediatepropagation();
          el.removeeventlistener('input', blocker);
        };
        el.addeventlistener('input', blocker);
        // $flow-disable-line
        el.__ieph = true; /* ie placeholder patched */
      }
      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 !== ')' ? ',' + args : args))
    }
  }

  /*  */



  /* eslint-disable no-unused-vars */
  function basewarn (msg, range) {
    console.error(("[vue compiler]: " + msg));
  }
  /* eslint-enable no-unused-vars */

  function pluckmodulefunction (
    modules,
    key
  ) {
    return modules
      ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
      : []
  }

  function addprop (el, name, value, range, dynamic) {
    (el.props || (el.props = [])).push(rangesetitem({ name: name, value: value, dynamic: dynamic }, range));
    el.plain = false;
  }

  function addattr (el, name, value, range, dynamic) {
    var attrs = dynamic
      ? (el.dynamicattrs || (el.dynamicattrs = []))
      : (el.attrs || (el.attrs = []));
    attrs.push(rangesetitem({ name: name, value: value, dynamic: dynamic }, range));
    el.plain = false;
  }

  // add a raw attr (use this in pretransforms)
  function addrawattr (el, name, value, range) {
    el.attrsmap[name] = value;
    el.attrslist.push(rangesetitem({ name: name, value: value }, range));
  }

  function adddirective (
    el,
    name,
    rawname,
    value,
    arg,
    isdynamicarg,
    modifiers,
    range
  ) {
    (el.directives || (el.directives = [])).push(rangesetitem({
      name: name,
      rawname: rawname,
      value: value,
      arg: arg,
      isdynamicarg: isdynamicarg,
      modifiers: modifiers
    }, range));
    el.plain = false;
  }

  function prependmodifiermarker (symbol, name, dynamic) {
    return dynamic
      ? ("_p(" + name + ",\"" + symbol + "\")")
      : symbol + name // mark the event as captured
  }

  function addhandler (
    el,
    name,
    value,
    modifiers,
    important,
    warn,
    range,
    dynamic
  ) {
    modifiers = modifiers || emptyobject;
    // warn prevent and passive modifier
    /* istanbul ignore if */
    if (
      warn &&
      modifiers.prevent && modifiers.passive
    ) {
      warn(
        'passive and prevent can\'t be used together. ' +
        'passive handler can\'t prevent default event.',
        range
      );
    }

    // normalize click.right and click.middle since they don't actually fire
    // this is technically browser-specific, but at least for now browsers are
    // the only target envs that have right/middle clicks.
    if (modifiers.right) {
      if (dynamic) {
        name = "(" + name + ")==='click'?'contextmenu':(" + name + ")";
      } else if (name === 'click') {
        name = 'contextmenu';
        delete modifiers.right;
      }
    } else if (modifiers.middle) {
      if (dynamic) {
        name = "(" + name + ")==='click'?'mouseup':(" + name + ")";
      } else if (name === 'click') {
        name = 'mouseup';
      }
    }

    // check capture modifier
    if (modifiers.capture) {
      delete modifiers.capture;
      name = prependmodifiermarker('!', name, dynamic);
    }
    if (modifiers.once) {
      delete modifiers.once;
      name = prependmodifiermarker('~', name, dynamic);
    }
    /* istanbul ignore if */
    if (modifiers.passive) {
      delete modifiers.passive;
      name = prependmodifiermarker('&', name, dynamic);
    }

    var events;
    if (modifiers.native) {
      delete modifiers.native;
      events = el.nativeevents || (el.nativeevents = {});
    } else {
      events = el.events || (el.events = {});
    }

    var newhandler = rangesetitem({ value: value.trim(), dynamic: dynamic }, range);
    if (modifiers !== emptyobject) {
      newhandler.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;
    }

    el.plain = false;
  }

  function getrawbindingattr (
    el,
    name
  ) {
    return el.rawattrsmap[':' + name] ||
      el.rawattrsmap['v-bind:' + name] ||
      el.rawattrsmap[name]
  }

  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)
      }
    }
  }

  // note: this only removes the attr from the array (attrslist) so that it
  // doesn't get processed by processattrs.
  // by default it does not remove it from the map (attrsmap) because the map is
  // needed during codegen.
  function getandremoveattr (
    el,
    name,
    removefrommap
  ) {
    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
        }
      }
    }
    if (removefrommap) {
      delete el.attrsmap[name];
    }
    return val
  }

  function getandremoveattrbyregex (
    el,
    name
  ) {
    var list = el.attrslist;
    for (var i = 0, l = list.length; i < l; i++) {
      var attr = list[i];
      if (name.test(attr.name)) {
        list.splice(i, 1);
        return attr
      }
    }
  }

  function rangesetitem (
    item,
    range
  ) {
    if (range) {
      if (range.start != null) {
        item.start = range.start;
      }
      if (range.end != null) {
        item.end = range.end;
      }
    }
    return item
  }

  /*  */

  /**
   * 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: json.stringify(value),
      callback: ("function (" + basevalueexpression + ") {" + assignment + "}")
    };
  }

  /**
   * cross-platform codegen helper for generating v-model value assignment code.
   */
  function genassignmentcode (
    value,
    assignment
  ) {
    var res = parsemodel(value);
    if (res.key === null) {
      return (value + "=" + assignment)
    } else {
      return ("$set(" + (res.exp) + ", " + (res.key) + ", " + assignment + ")")
    }
  }

  /**
   * parse a v-model expression into a base path and a final key segment.
   * handles both dot-path and possible square brackets.
   *
   * possible cases:
   *
   * - test
   * - test[key]
   * - test[test1[key]]
   * - test["a"][key]
   * - xxx.test[a[a].test1[key]]
   * - test.xxx.a["asa"][test1[key]]
   *
   */

  var len, str, chr, index$1, expressionpos, expressionendpos;



  function parsemodel (val) {
    // allow v-model="obj.val " (trailing whitespace)
    val = val.trim();
    len = val.length;

    if (val.indexof('[') < 0 || val.lastindexof(']') < len - 1) {
      index$1 = val.lastindexof('.');
      if (index$1 > -1) {
        return {
          exp: val.slice(0, index$1),
          key: '"' + val.slice(index$1 + 1) + '"'
        }
      } else {
        return {
          exp: val,
          key: null
        }
      }
    }

    str = val;
    index$1 = expressionpos = expressionendpos = 0;

    while (!eof()) {
      chr = next();
      /* istanbul ignore if */
      if (isstringstart(chr)) {
        parsestring(chr);
      } else if (chr === 0x5b) {
        parsebracket(chr);
      }
    }

    return {
      exp: val.slice(0, expressionpos),
      key: val.slice(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;

    {
      // 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.",
          el.rawattrsmap['v-model']
        );
      }
    }

    if (el.component) {
      gencomponentmodel(el, value, modifiers);
      // component v-model doesn't need extra runtime
      return false
    } else 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.',
        el.rawattrsmap['v-model']
      );
    }

    // 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, 'change',
      "var $$a=" + value + "," +
          '$$el=$event.target,' +
          "$$c=$$el.checked?(" + truevaluebinding + "):(" + falsevaluebinding + ");" +
      'if(array.isarray($$a)){' +
        "var $$v=" + (number ? '_n(' + valuebinding + ')' : valuebinding) + "," +
            '$$i=_i($$a,$$v);' +
        "if($$el.checked){$$i<0&&(" + (genassignmentcode(value, '$$a.concat([$$v])')) + ")}" +
        "else{$$i>-1&&(" + (genassignmentcode(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, 'change', 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;

    // warn if v-bind:value conflicts with v-model
    // except for inputs with v-bind:type
    {
      var value$1 = el.attrsmap['v-bind:value'] || el.attrsmap[':value'];
      var typebinding = el.attrsmap['v-bind:type'] || el.attrsmap[':type'];
      if (value$1 && !typebinding) {
        var binding = el.attrsmap['v-bind:value'] ? 'v-bind:value' : ':value';
        warn$1(
          binding + "=\"" + value$1 + "\" conflicts with v-model on the same element " +
          'because the latter already expands to a value binding internally',
          el.rawattrsmap[binding]
        );
      }
    }

    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) {
      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) {
    /* istanbul ignore if */
    if (isdef(on[range_token])) {
      // ie input[type=range] only supports `change` event
      var event = isie ? 'change' : 'input';
      on[event] = [].concat(on[range_token], on[event] || []);
      delete on[range_token];
    }
    // this was originally intended to fix #4521 but no longer necessary
    // after 2.5. keeping it for backwards compat with generated code from < 2.4
    /* istanbul ignore if */
    if (isdef(on[checkbox_radio_token])) {
      on.change = [].concat(on[checkbox_radio_token], on.change || []);
      delete on[checkbox_radio_token];
    }
  }

  var target$1;

  function createoncehandler$1 (event, handler, capture) {
    var _target = target$1; // save current target element in closure
    return function oncehandler () {
      var res = handler.apply(null, arguments);
      if (res !== null) {
        remove$2(event, oncehandler, capture, _target);
      }
    }
  }

  // #9446: firefox <= 53 (in particular, esr 52) has incorrect event.timestamp
  // implementation and does not fire microtasks in between event propagation, so
  // safe to exclude.
  var usemicrotaskfix = isusingmicrotask && !(isff && number(isff[1]) <= 53);

  function add$1 (
    name,
    handler,
    capture,
    passive
  ) {
    // async edge case #6566: inner click event triggers patch, event handler
    // attached to outer element during patch, and triggered again. this
    // happens because browsers fire microtask ticks between event propagation.
    // the solution is simple: we save the timestamp when a handler is attached,
    // and the handler would only fire if the event passed to it was fired
    // after it was attached.
    if (usemicrotaskfix) {
      var attachedtimestamp = currentflushtimestamp;
      var original = handler;
      handler = original._wrapper = function (e) {
        if (
          // no bubbling, should always fire.
          // this is just a safety net in case event.timestamp is unreliable in
          // certain weird environments...
          e.target === e.currenttarget ||
          // event is fired after handler attachment
          e.timestamp >= attachedtimestamp ||
          // bail for environments that have buggy event.timestamp implementations
          // #9462 ios 9 bug: event.timestamp is 0 after history.pushstate
          // #9681 qtwebengine event.timestamp is negative value
          e.timestamp <= 0 ||
          // #9448 bail if event is fired in another document in a multi-page
          // electron/nw.js app, since event.timestamp will be using a different
          // starting reference
          e.target.ownerdocument !== document
        ) {
          return original.apply(this, arguments)
        }
      };
    }
    target$1.addeventlistener(
      name,
      handler,
      supportspassive
        ? { capture: capture, passive: passive }
        : capture
    );
  }

  function remove$2 (
    name,
    handler,
    capture,
    _target
  ) {
    (_target || target$1).removeeventlistener(
      name,
      handler._wrapper || 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, createoncehandler$1, vnode.context);
    target$1 = undefined;
  }

  var events = {
    create: updatedomlisteners,
    update: updatedomlisteners
  };

  /*  */

  var svgcontainer;

  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 (!(key in props)) {
        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 }
        // #6601 work around chrome version <= 55 bug where single textnode
        // replaced by innerhtml/textcontent retains its parentnode property
        if (elm.childnodes.length === 1) {
          elm.removechild(elm.childnodes[0]);
        }
      }

      if (key === 'value' && elm.tagname !== 'progress') {
        // store value as _value as well since
        // non-string values will be stringified
        elm._value = cur;
        // avoid resetting cursor position when value is the same
        var strcur = isundef(cur) ? '' : string(cur);
        if (shouldupdatevalue(elm, strcur)) {
          elm.value = strcur;
        }
      } else if (key === 'innerhtml' && issvg(elm.tagname) && isundef(elm.innerhtml)) {
        // ie doesn't support innerhtml for svg elements
        svgcontainer = svgcontainer || document.createelement('div');
        svgcontainer.innerhtml = "<svg>" + cur + "</svg>";
        var svg = svgcontainer.firstchild;
        while (elm.firstchild) {
          elm.removechild(elm.firstchild);
        }
        while (svg.firstchild) {
          elm.appendchild(svg.firstchild);
        }
      } else if (
        // skip the update if old and new vdom state is the same.
        // `value` is handled separately because the dom value may be temporarily
        // out of sync with vdom state due to focus, composition and modifiers.
        // this  #4521 by skipping the unnecesarry `checked` update.
        cur !== oldprops[key]
      ) {
        // some property updates can throw
        // e.g. `value` on <progress> w/ non-finite value
        try {
          elm[key] = cur;
        } catch (e) {}
      }
    }
  }

  // check platforms/web/util/attrs.js acceptvalue


  function shouldupdatevalue (elm, checkval) {
    return (!elm.composing && (
      elm.tagname === 'option' ||
      isnotinfocusanddirty(elm, checkval) ||
      isdirtywithmodifiers(elm, checkval)
    ))
  }

  function isnotinfocusanddirty (elm, checkval) {
    // return true when textbox (.number and .trim) loses focus and its value is
    // not equal to the updated value
    var notinfocus = true;
    // #6157
    // work around ie bug when accessing document.activeelement in an iframe
    try { notinfocus = document.activeelement !== elm; } catch (e) {}
    return notinfocus && elm.value !== checkval
  }

  function isdirtywithmodifiers (elm, newval) {
    var value = elm.value;
    var modifiers = elm._vmodifiers; // injected by v-model runtime
    if (isdef(modifiers)) {
      if (modifiers.number) {
        return tonumber(value) !== tonumber(newval)
      }
      if (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 && 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(hyphenate(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 vendornames = ['webkit', 'moz', 'ms'];

  var emptystyle;
  var normalize = cached(function (prop) {
    emptystyle = emptystyle || document.createelement('div').style;
    prop = camelize(prop);
    if (prop !== 'filter' && (prop in emptystyle)) {
      return prop
    }
    var capname = prop.charat(0).touppercase() + prop.slice(1);
    for (var i = 0; i < vendornames.length; i++) {
      var name = vendornames[i] + capname;
      if (name in emptystyle) {
        return name
      }
    }
  });

  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 likely 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
  };

  /*  */

  var whitespacere = /\s+/;

  /**
   * 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(whitespacere).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(whitespacere).foreach(function (c) { return el.classlist.remove(c); });
      } else {
        el.classlist.remove(cls);
      }
      if (!el.classlist.length) {
        el.removeattribute('class');
      }
    } else {
      var cur = " " + (el.getattribute('class') || '') + " ";
      var tar = ' ' + cls + ' ';
      while (cur.indexof(tar) >= 0) {
        cur = cur.replace(tar, ' ');
      }
      cur = cur.trim();
      if (cur) {
        el.setattribute('class', cur);
      } else {
        el.removeattribute('class');
      }
    }
  }

  /*  */

  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
    : /* istanbul ignore next */ function (fn) { return fn(); };

  function nextframe (fn) {
    raf(function () {
      raf(fn);
    });
  }

  function addtransitionclass (el, cls) {
    var transitionclasses = el._transitionclasses || (el._transitionclasses = []);
    if (transitionclasses.indexof(cls) < 0) {
      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);
    // jsdom may return undefined for transition properties
    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])
    }))
  }

  // old versions of chromium (below 61.0.3163.100) formats floating pointer numbers
  // in a locale-dependent way, using a comma instead of a dot.
  // if comma is not replaced with a dot, the input will be rounded down (i.e. acting
  // as a floor function) causing unexpected behaviors
  function toms (s) {
    return number(s.slice(0, -1).replace(',', '.')) * 1000
  }

  /*  */

  function enter (vnode, toggledisplay) {
    var el = vnode.elm;

    // call leave callback now
    if (isdef(el._leavecb)) {
      el._leavecb.cancelled = true;
      el._leavecb();
    }

    var data = resolvetransition(vnode.data.transition);
    if (isundef(data)) {
      return
    }

    /* istanbul ignore if */
    if (isdef(el._entercb) || el.nodetype !== 1) {
      return
    }

    var css = data.css;
    var type = data.type;
    var enterclass = data.enterclass;
    var entertoclass = data.entertoclass;
    var enteractiveclass = data.enteractiveclass;
    var appearclass = data.appearclass;
    var appeartoclass = data.appeartoclass;
    var appearactiveclass = data.appearactiveclass;
    var beforeenter = data.beforeenter;
    var enter = data.enter;
    var afterenter = data.afterenter;
    var entercancelled = data.entercancelled;
    var beforeappear = data.beforeappear;
    var appear = data.appear;
    var afterappear = data.afterappear;
    var appearcancelled = data.appearcancelled;
    var duration = data.duration;

    // activeinstance will always be the <transition> component managing this
    // transition. one edge case to check is when the <transition> is placed
    // as the root node of a child component. in that case we need to check
    // <transition>'s parent for appear check.
    var context = activeinstance;
    var transitionnode = activeinstance.$vnode;
    while (transitionnode && transitionnode.parent) {
      context = transitionnode.context;
      transitionnode = transitionnode.parent;
    }

    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 (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, '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 () {
        removetransitionclass(el, startclass);
        if (!cb.cancelled) {
          addtransitionclass(el, toclass);
          if (!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) || el.nodetype !== 1) {
      return rm()
    }

    /* istanbul ignore if */
    if (isdef(el._leavecb)) {
      return
    }

    var css = data.css;
    var type = data.type;
    var leaveclass = data.leaveclass;
    var leavetoclass = data.leavetoclass;
    var leaveactiveclass = data.leaveactiveclass;
    var beforeleave = data.beforeleave;
    var leave = data.leave;
    var afterleave = data.afterleave;
    var leavecancelled = data.leavecancelled;
    var delayleave = data.delayleave;
    var duration = data.duration;

    var expectscss = css !== false && !isie9;
    var userwantscontrol = gethookargumentslength(leave);

    var explicitleaveduration = tonumber(
      isobject(duration)
        ? duration.leave
        : duration
    );

    if (isdef(explicitleaveduration)) {
      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) {
        (el.parentnode._pending || (el.parentnode._pending = {}))[(vnode.key)] = vnode;
      }
      beforeleave && beforeleave(el);
      if (expectscss) {
        addtransitionclass(el, leaveclass);
        addtransitionclass(el, leaveactiveclass);
        nextframe(function () {
          removetransitionclass(el, leaveclass);
          if (!cb.cancelled) {
            addtransitionclass(el, leavetoclass);
            if (!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) {
    document.addeventlistener('selectionchange', function () {
      var el = document.activeelement;
      if (el && el.vmodel) {
        trigger(el, 'input');
      }
    });
  }

  var directive = {
    inserted: function inserted (el, binding, vnode, oldvnode) {
      if (vnode.tag === 'select') {
        // #6903
        if (oldvnode.elm && !oldvnode.elm._voptions) {
          mergevnodehook(vnode, 'postpatch', function () {
            directive.componentupdated(el, binding, vnode);
          });
        } else {
          setselected(el, binding, vnode.context);
        }
        el._voptions = [].map.call(el.options, getvalue);
      } else if (vnode.tag === 'textarea' || istextinputtype(el.type)) {
        el._vmodifiers = binding.modifiers;
        if (!binding.modifiers.lazy) {
          el.addeventlistener('compositionstart', oncompositionstart);
          el.addeventlistener('compositionend', oncompositionend);
          // 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);
          /* 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 prevoptions = el._voptions;
        var curoptions = el._voptions = [].map.call(el.options, getvalue);
        if (curoptions.some(function (o, i) { return !looseequal(o, prevoptions[i]); })) {
          // trigger change event if
          // no matching option found for at least one value
          var needreset = el.multiple
            ? binding.value.some(function (v) { return hasnomatchingoption(v, curoptions); })
            : binding.value !== binding.oldvalue && hasnomatchingoption(binding.value, curoptions);
          if (needreset) {
            trigger(el, 'change');
          }
        }
      }
    }
  };

  function setselected (el, binding, vm) {
    actuallysetselected(el, binding, vm);
    /* istanbul ignore if */
    if (isie || isedge) {
      settimeout(function () {
        actuallysetselected(el, binding, vm);
      }, 0);
    }
  }

  function actuallysetselected (el, binding, vm) {
    var value = binding.value;
    var ismultiple = el.multiple;
    if (ismultiple && !array.isarray(value)) {
      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) {
    return options.every(function (o) { return !looseequal(o, value); })
  }

  function getvalue (option) {
    return '_value' in option
      ? option._value
      : option.value
  }

  function oncompositionstart (e) {
    e.target.composing = true;
  }

  function oncompositionend (e) {
    // prevent triggering an input event for no reason
    if (!e.target.composing) { return }
    e.target.composing = false;
    trigger(e.target, 'input');
  }

  function trigger (el, type) {
    var e = document.createevent('htmlevents');
    e.initevent(type, true, true);
    el.dispatchevent(e);
  }

  /*  */

  // recursively search for possible transition defined inside the component root
  function locatenode (vnode) {
    return vnode.componentinstance && (!vnode.data || !vnode.data.transition)
      ? locatenode(vnode.componentinstance._vnode)
      : vnode
  }

  var show = {
    bind: function bind (el, ref, vnode) {
      var value = ref.value;

      vnode = locatenode(vnode);
      var transition$$1 = vnode.data && vnode.data.transition;
      var originaldisplay = el.__voriginaldisplay =
        el.style.display === 'none' ? '' : el.style.display;
      if (value && transition$$1) {
        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$$1 = vnode.data && vnode.data.transition;
      if (transition$$1) {
        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: directive,
    show: show
  };

  /*  */

  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 isnottextnode = function (c) { return c.tag || isasyncplaceholder(c); };

  var isvshowdirective = function (d) { return d.name === 'show'; };

  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(isnottextnode);
      /* istanbul ignore if */
      if (!children.length) {
        return
      }

      // warn multiple elements
      if (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 (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
        ? child.iscomment
          ? id + 'comment'
          : 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(isvshowdirective)) {
        child.data.show = true;
      }

      if (
        oldchild &&
        oldchild.data &&
        !issamechild(child, oldchild) &&
        !isasyncplaceholder(oldchild) &&
        // #6687 component root is a comment node
        !(oldchild.componentinstance && oldchild.componentinstance._vnode.iscomment)
      ) {
        // replace old child transition data with fresh one
        // important for dynamic transitions!
        var olddata = 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') {
          if (isasyncplaceholder(child)) {
            return oldrawchild
          }
          var delayedleave;
          var performleave = function () { delayedleave(); };
          mergevnodehook(data, 'afterenter', performleave);
          mergevnodehook(data, 'entercancelled', performleave);
          mergevnodehook(olddata, 'delayleave', function (leave) { delayedleave = leave; });
        }
      }

      return rawchild
    }
  };

  /*  */

  var props = extend({
    tag: string,
    moveclass: string
  }, transitionprops);

  delete props.mode;

  var transitiongroup = {
    props: props,

    beforemount: function beforemount () {
      var this$1 = this;

      var update = this._update;
      this._update = function (vnode, hydrating) {
        var restoreactiveinstance = setactiveinstance(this$1);
        // force removing pass
        this$1.__patch__(
          this$1._vnode,
          this$1.kept,
          false, // hydrating
          true // removeonly (!important, avoids unnecessary moves)
        );
        this$1._vnode = this$1.kept;
        restoreactiveinstance();
        update.call(this$1, vnode, hydrating);
      };
    },

    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)
    },

    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
      // assign to this to avoid being removed in tree-shaking
      // $flow-disable-line
      this._reflow = document.body.offsetheight;

      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 && e.target !== el) {
              return
            }
            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
        }
        /* istanbul ignore if */
        if (this._hasmove) {
          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.config.mustuseprop = mustuseprop;
  vue.config.isreservedtag = isreservedtag;
  vue.config.isreservedattr = isreservedattr;
  vue.config.gettagnamespace = gettagnamespace;
  vue.config.isunknownelement = isunknownelement;

  // install platform runtime directives & components
  extend(vue.options.directives, platformdirectives);
  extend(vue.options.components, platformcomponents);

  // install platform patch function
  vue.prototype.__patch__ = inbrowser ? patch : noop;

  // public mount method
  vue.prototype.$mount = function (
    el,
    hydrating
  ) {
    el = el && inbrowser ? query(el) : undefined;
    return mountcomponent(this, el, hydrating)
  };

  // devtools global hook
  /* istanbul ignore next */
  if (inbrowser) {
    settimeout(function () {
      if (config.devtools) {
        if (devtools) {
          devtools.emit('init', vue);
        } else {
          console[console.info ? 'info' : 'log'](
            'download the vue devtools extension for a better development experience:\n' +
            ' '
          );
        }
      }
      if (config.productiontip !== false &&
        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  "
        );
      }
    }, 0);
  }

  /*  */

  var defaulttagre = /\{\{((?:.|\r?\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 rawtokens = [];
    var lastindex = tagre.lastindex = 0;
    var match, index, tokenvalue;
    while ((match = tagre.exec(text))) {
      index = match.index;
      // push text token
      if (index > lastindex) {
        rawtokens.push(tokenvalue = text.slice(lastindex, index));
        tokens.push(json.stringify(tokenvalue));
      }
      // tag token
      var exp = parsefilters(match[1].trim());
      tokens.push(("_s(" + exp + ")"));
      rawtokens.push({ '@binding': exp });
      lastindex = index + match[0].length;
    }
    if (lastindex < text.length) {
      rawtokens.push(tokenvalue = text.slice(lastindex));
      tokens.push(json.stringify(tokenvalue));
    }
    return {
      expression: tokens.join('+'),
      tokens: rawtokens
    }
  }

  /*  */

  function transformnode (el, options) {
    var warn = options.warn || basewarn;
    var staticclass = getandremoveattr(el, 'class');
    if (staticclass) {
      var res = parsetext(staticclass, options.delimiters);
      if (res) {
        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">.',
          el.rawattrsmap['class']
        );
      }
    }
    if (staticclass) {
      el.staticclass = json.stringify(staticclass);
    }
    var classbinding = getbindingattr(el, 'class', false /* getstatic */);
    if (classbinding) {
      el.classbinding = classbinding;
    }
  }

  function gendata (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
  };

  /*  */

  function transformnode$1 (el, options) {
    var warn = options.warn || basewarn;
    var staticstyle = getandremoveattr(el, 'style');
    if (staticstyle) {
      /* istanbul ignore if */
      {
        var res = parsetext(staticstyle, options.delimiters);
        if (res) {
          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.rawattrsmap['style']
          );
        }
      }
      el.staticstyle = json.stringify(parsestyletext(staticstyle));
    }

    var stylebinding = getbindingattr(el, 'style', false /* getstatic */);
    if (stylebinding) {
      el.stylebinding = stylebinding;
    }
  }

  function gendata$1 (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$1
  };

  /*  */

  var decoder;

  var he = {
    decode: function decode (html) {
      decoder = decoder || document.createelement('div');
      decoder.innerhtml = html;
      return decoder.textcontent
    }
  };

  /*  */

  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'
  );

  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'
  );

  /**
   * not type-checking this file because it's mostly vendor code.
   */

  // regular expressions for parsing tags and attributes
  var attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
  var dynamicargattribute = /^\s*((?:v-[\w-]+:|@|:|#)\[[^=]+\][^\s"'<>\/=]*)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
  var ncname = "[a-za-z_][\\-\\.0-9_a-za-z" + (unicoderegexp.source) + "]*";
  var qnamecapture = "((?:" + ncname + "\\:)?" + ncname + ")";
  var starttagopen = new regexp(("^<" + qnamecapture));
  var starttagclose = /^\s*(\/?)>/;
  var endtag = new regexp(("^<\\/" + qnamecapture + "[^>]*>"));
  var doctype = /^<!doctype [^>]+>/i;
  // #7298: escape - to avoid being pased as html comment when inlined in page
  var comment = /^<!\--/;
  var conditionalcomment = /^<!\[/;

  // special elements (can contain anything)
  var isplaintextelement = makemap('script,style,textarea', true);
  var recache = {};

  var decodingmap = {
    '&lt;': '<',
    '&gt;': '>',
    '&quot;': '"',
    '&amp;': '&',
    '&#10;': '\n',
    '&#9;': '\t',
    '&#39;': "'"
  };
  var encodedattr = /&(?:lt|gt|quot|amp|#39);/g;
  var encodedattrwithnewlines = /&(?:lt|gt|quot|amp|#39|#10|#9);/g;

  // #5992
  var isignorenewlinetag = makemap('pre,textarea', true);
  var shouldignorefirstnewline = function (tag, html) { return tag && isignorenewlinetag(tag) && html[0] === '\n'; };

  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) {
              if (options.shouldkeepcomment) {
                options.comment(html.substring(4, commentend), index, index + commentend + 3);
              }
              advance(commentend + 3);
              continue
            }
          }

          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);
            if (shouldignorefirstnewline(starttagmatch.tagname, html)) {
              advance(1);
            }
            continue
          }
        }

        var text = (void 0), rest = (void 0), next = (void 0);
        if (textend >= 0) {
          rest = html.slice(textend);
          while (
            !endtag.test(rest) &&
            !starttagopen.test(rest) &&
            !comment.test(rest) &&
            !conditionalcomment.test(rest)
          ) {
            // < in plain text, be forgiving and treat it as text
            next = rest.indexof('<', 1);
            if (next < 0) { break }
            textend += next;
            rest = html.slice(textend);
          }
          text = html.substring(0, textend);
        }

        if (textend < 0) {
          text = html;
        }

        if (text) {
          advance(text.length);
        }

        if (options.chars && text) {
          options.chars(text, index - text.length, index);
        }
      } else {
        var endtaglength = 0;
        var stackedtag = lasttag.tolowercase();
        var restackedtag = recache[stackedtag] || (recache[stackedtag] = new regexp('([\\s\\s]*?)(</' + stackedtag + '[^>]*>)', 'i'));
        var rest$1 = html.replace(restackedtag, function (all, text, endtag) {
          endtaglength = endtag.length;
          if (!isplaintextelement(stackedtag) && stackedtag !== 'noscript') {
            text = text
              .replace(/<!\--([\s\s]*?)-->/g, '$1') // #7298
              .replace(/<!\[cdata\[([\s\s]*?)]]>/g, '$1');
          }
          if (shouldignorefirstnewline(stackedtag, text)) {
            text = text.slice(1);
          }
          if (options.chars) {
            options.chars(text);
          }
          return ''
        });
        index += html.length - rest$1.length;
        html = rest$1;
        parseendtag(stackedtag, index - endtaglength, index);
      }

      if (html === last) {
        options.chars && options.chars(html);
        if (!stack.length && options.warn) {
          options.warn(("mal-formatted tag at end of template: \"" + html + "\""), { start: index + html.length });
        }
        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(dynamicargattribute) || html.match(attribute))) {
          attr.start = index;
          advance(attr[0].length);
          attr.end = index;
          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) || !!unaryslash;

      var l = match.attrs.length;
      var attrs = new array(l);
      for (var i = 0; i < l; i++) {
        var args = match.attrs[i];
        var value = args[3] || args[4] || args[5] || '';
        var shoulddecodenewlines = tagname === 'a' && args[1] === 'href'
          ? options.shoulddecodenewlinesforhref
          : options.shoulddecodenewlines;
        attrs[i] = {
          name: args[1],
          value: decodeattr(value, shoulddecodenewlines)
        };
        if (options.outputsourcerange) {
          attrs[i].start = args.start + args[0].match(/^\s*/).length;
          attrs[i].end = args.end;
        }
      }

      if (!unary) {
        stack.push({ tag: tagname, lowercasedtag: tagname.tolowercase(), attrs: attrs, start: match.start, end: match.end });
        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; }

      // find the closest opened tag of the same type
      if (tagname) {
        lowercasedtagname = tagname.tolowercase();
        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 (i > pos || !tagname &&
            options.warn
          ) {
            options.warn(
              ("tag <" + (stack[i].tag) + "> has no matching end tag."),
              { start: stack[i].start, end: stack[i].end }
            );
          }
          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 onre = /^@|^v-on:/;
  var dirre = /^v-|^@|^:/;
  var foraliasre = /([\s\s]*?)\s+(?:in|of)\s+([\s\s]*)/;
  var foriteratorre = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/;
  var stripparensre = /^\(|\)$/g;
  var dynamicargre = /^\[.*\]$/;

  var argre = /:(.*)$/;
  var bindre = /^:|^\.|^v-bind:/;
  var modifierre = /\.[^.\]]+(?=[^\]]*$)/g;

  var slotre = /^v-slot(:|$)|^#/;

  var linebreakre = /[\r\n]/;
  var whitespacere$1 = /\s+/g;

  var invalidattributere = /[\s"'<>\/=]/;

  var decodehtmlcached = cached(he.decode);

  var emptyslotscopetoken = "_empty_";

  // configurable state
  var warn$2;
  var delimiters;
  var transforms;
  var pretransforms;
  var posttransforms;
  var platformispretag;
  var platformmustuseprop;
  var platformgettagnamespace;
  var maybecomponent;

  function createastelement (
    tag,
    attrs,
    parent
  ) {
    return {
      type: 1,
      tag: tag,
      attrslist: attrs,
      attrsmap: makeattrsmap(attrs),
      rawattrsmap: {},
      parent: parent,
      children: []
    }
  }

  /**
   * convert html string to ast.
   */
  function parse (
    template,
    options
  ) {
    warn$2 = options.warn || basewarn;

    platformispretag = options.ispretag || no;
    platformmustuseprop = options.mustuseprop || no;
    platformgettagnamespace = options.gettagnamespace || no;
    var isreservedtag = options.isreservedtag || no;
    maybecomponent = function (el) { return !!el.component || !isreservedtag(el.tag); };

    transforms = pluckmodulefunction(options.modules, 'transformnode');
    pretransforms = pluckmodulefunction(options.modules, 'pretransformnode');
    posttransforms = pluckmodulefunction(options.modules, 'posttransformnode');

    delimiters = options.delimiters;

    var stack = [];
    var preservewhitespace = options.preservewhitespace !== false;
    var whitespaceoption = options.whitespace;
    var root;
    var currentparent;
    var invpre = false;
    var inpre = false;
    var warned = false;

    function warnonce (msg, range) {
      if (!warned) {
        warned = true;
        warn$2(msg, range);
      }
    }

    function closeelement (element) {
      trimendingwhitespace(element);
      if (!invpre && !element.processed) {
        element = processelement(element, options);
      }
      // tree management
      if (!stack.length && element !== root) {
        // 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.",
            { start: element.start }
          );
        }
      }
      if (currentparent && !element.forbidden) {
        if (element.elseif || element.else) {
          processifconditions(element, currentparent);
        } else {
          if (element.slotscope) {
            // scoped slot
            // keep it in the children list so that v-else(-if) conditions can
            // find it as the prev node.
            var name = element.slottarget || '"default"'
            ;(currentparent.scopedslots || (currentparent.scopedslots = {}))[name] = element;
          }
          currentparent.children.push(element);
          element.parent = currentparent;
        }
      }

      // final children cleanup
      // filter out scoped slots
      element.children = element.children.filter(function (c) { return !(c).slotscope; });
      // remove trailing whitespace node again
      trimendingwhitespace(element);

      // check pre state
      if (element.pre) {
        invpre = false;
      }
      if (platformispretag(element.tag)) {
        inpre = false;
      }
      // apply post-transforms
      for (var i = 0; i < posttransforms.length; i++) {
        posttransforms[i](element, options);
      }
    }

    function trimendingwhitespace (el) {
      // remove trailing whitespace node
      if (!inpre) {
        var lastnode;
        while (
          (lastnode = el.children[el.children.length - 1]) &&
          lastnode.type === 3 &&
          lastnode.text === ' '
        ) {
          el.children.pop();
        }
      }
    }

    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.',
          { start: el.start }
        );
      }
      if (el.attrsmap.hasownproperty('v-for')) {
        warnonce(
          'cannot use v-for on stateful component root element because ' +
          'it renders multiple elements.',
          el.rawattrsmap['v-for']
        );
      }
    }

    parsehtml(template, {
      warn: warn$2,
      expecthtml: options.expecthtml,
      isunarytag: options.isunarytag,
      canbeleftopentag: options.canbeleftopentag,
      shoulddecodenewlines: options.shoulddecodenewlines,
      shoulddecodenewlinesforhref: options.shoulddecodenewlinesforhref,
      shouldkeepcomment: options.comments,
      outputsourcerange: options.outputsourcerange,
      start: function start (tag, attrs, unary, start$1, end) {
        // 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 = createastelement(tag, attrs, currentparent);
        if (ns) {
          element.ns = ns;
        }

        {
          if (options.outputsourcerange) {
            element.start = start$1;
            element.end = end;
            element.rawattrsmap = element.attrslist.reduce(function (cumulated, attr) {
              cumulated[attr.name] = attr;
              return cumulated
            }, {});
          }
          attrs.foreach(function (attr) {
            if (invalidattributere.test(attr.name)) {
              warn$2(
                "invalid dynamic argument expression: attribute names cannot contain " +
                "spaces, quotes, <, >, / or =.",
                {
                  start: attr.start + attr.name.indexof("["),
                  end: attr.start + attr.name.length
                }
              );
            }
          });
        }

        if (isforbiddentag(element) && !isserverrendering()) {
          element.forbidden = true;
          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.',
            { start: element.start }
          );
        }

        // apply pre-transforms
        for (var i = 0; i < pretransforms.length; i++) {
          element = pretransforms[i](element, options) || element;
        }

        if (!invpre) {
          processpre(element);
          if (element.pre) {
            invpre = true;
          }
        }
        if (platformispretag(element.tag)) {
          inpre = true;
        }
        if (invpre) {
          processrawattrs(element);
        } else if (!element.processed) {
          // structural directives
          processfor(element);
          processif(element);
          processonce(element);
        }

        if (!root) {
          root = element;
          {
            checkrootconstraints(root);
          }
        }

        if (!unary) {
          currentparent = element;
          stack.push(element);
        } else {
          closeelement(element);
        }
      },

      end: function end (tag, start, end$1) {
        var element = stack[stack.length - 1];
        // pop stack
        stack.length -= 1;
        currentparent = stack[stack.length - 1];
        if (options.outputsourcerange) {
          element.end = end$1;
        }
        closeelement(element);
      },

      chars: function chars (text, start, end) {
        if (!currentparent) {
          {
            if (text === template) {
              warnonce(
                'component template requires a root element, rather than just text.',
                { start: start }
              );
            } else if ((text = text.trim())) {
              warnonce(
                ("text \"" + text + "\" outside root element will be ignored."),
                { start: start }
              );
            }
          }
          return
        }
        // ie textarea placeholder bug
        /* istanbul ignore if */
        if (isie &&
          currentparent.tag === 'textarea' &&
          currentparent.attrsmap.placeholder === text
        ) {
          return
        }
        var children = currentparent.children;
        if (inpre || text.trim()) {
          text = istexttag(currentparent) ? text : decodehtmlcached(text);
        } else if (!children.length) {
          // remove the whitespace-only node right after an opening tag
          text = '';
        } else if (whitespaceoption) {
          if (whitespaceoption === 'condense') {
            // in condense mode, remove the whitespace node if it contains
            // line break, otherwise condense to a single space
            text = linebreakre.test(text) ? '' : ' ';
          } else {
            text = ' ';
          }
        } else {
          text = preservewhitespace ? ' ' : '';
        }
        if (text) {
          if (!inpre && whitespaceoption === 'condense') {
            // condense consecutive whitespaces into single space
            text = text.replace(whitespacere$1, ' ');
          }
          var res;
          var child;
          if (!invpre && text !== ' ' && (res = parsetext(text, delimiters))) {
            child = {
              type: 2,
              expression: res.expression,
              tokens: res.tokens,
              text: text
            };
          } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
            child = {
              type: 3,
              text: text
            };
          }
          if (child) {
            if (options.outputsourcerange) {
              child.start = start;
              child.end = end;
            }
            children.push(child);
          }
        }
      },
      comment: function comment (text, start, end) {
        // adding anyting as a sibling to the root node is forbidden
        // comments should still be allowed, but ignored
        if (currentparent) {
          var child = {
            type: 3,
            text: text,
            iscomment: true
          };
          if (options.outputsourcerange) {
            child.start = start;
            child.end = end;
          }
          currentparent.children.push(child);
        }
      }
    });
    return root
  }

  function processpre (el) {
    if (getandremoveattr(el, 'v-pre') != null) {
      el.pre = true;
    }
  }

  function processrawattrs (el) {
    var list = el.attrslist;
    var len = list.length;
    if (len) {
      var attrs = el.attrs = new array(len);
      for (var i = 0; i < len; i++) {
        attrs[i] = {
          name: list[i].name,
          value: json.stringify(list[i].value)
        };
        if (list[i].start != null) {
          attrs[i].start = list[i].start;
          attrs[i].end = list[i].end;
        }
      }
    } else if (!el.pre) {
      // non root node in pre blocks with no attributes
      el.plain = true;
    }
  }

  function processelement (
    element,
    options
  ) {
    processkey(element);

    // determine whether this is a plain element after
    // removing structural attributes
    element.plain = (
      !element.key &&
      !element.scopedslots &&
      !element.attrslist.length
    );

    processref(element);
    processslotcontent(element);
    processslotoutlet(element);
    processcomponent(element);
    for (var i = 0; i < transforms.length; i++) {
      element = transforms[i](element, options) || element;
    }
    processattrs(element);
    return element
  }

  function processkey (el) {
    var exp = getbindingattr(el, 'key');
    if (exp) {
      {
        if (el.tag === 'template') {
          warn$2(
            "<template> cannot be keyed. place the key on real elements instead.",
            getrawbindingattr(el, 'key')
          );
        }
        if (el.for) {
          var iterator = el.iterator2 || el.iterator1;
          var parent = el.parent;
          if (iterator && iterator === exp && parent && parent.tag === 'transition-group') {
            warn$2(
              "do not use v-for index as key on <transition-group> children, " +
              "this is the same as not using keys.",
              getrawbindingattr(el, 'key'),
              true /* tip */
            );
          }
        }
      }
      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 res = parsefor(exp);
      if (res) {
        extend(el, res);
      } else {
        warn$2(
          ("invalid v-for expression: " + exp),
          el.rawattrsmap['v-for']
        );
      }
    }
  }



  function parsefor (exp) {
    var inmatch = exp.match(foraliasre);
    if (!inmatch) { return }
    var res = {};
    res.for = inmatch[2].trim();
    var alias = inmatch[1].trim().replace(stripparensre, '');
    var iteratormatch = alias.match(foriteratorre);
    if (iteratormatch) {
      res.alias = alias.replace(foriteratorre, '').trim();
      res.iterator1 = iteratormatch[1].trim();
      if (iteratormatch[2]) {
        res.iterator2 = iteratormatch[2].trim();
      }
    } else {
      res.alias = alias;
    }
    return res
  }

  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.",
        el.rawattrsmap[el.elseif ? 'v-else-if' : 'v-else']
      );
    }
  }

  function findprevelement (children) {
    var i = children.length;
    while (i--) {
      if (children[i].type === 1) {
        return children[i]
      } else {
        if (children[i].text !== ' ') {
          warn$2(
            "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
            "will be ignored.",
            children[i]
          );
        }
        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;
    }
  }

  // handle content being passed to a component as slot,
  // e.g. <template slot="xxx">, <div slot-scope="xxx">
  function processslotcontent (el) {
    var slotscope;
    if (el.tag === 'template') {
      slotscope = getandremoveattr(el, 'scope');
      /* istanbul ignore if */
      if (slotscope) {
        warn$2(
          "the \"scope\" attribute for scoped slots have been deprecated and " +
          "replaced by \"slot-scope\" since 2.5. the new \"slot-scope\" attribute " +
          "can also be used on plain elements in addition to <template> to " +
          "denote scoped slots.",
          el.rawattrsmap['scope'],
          true
        );
      }
      el.slotscope = slotscope || getandremoveattr(el, 'slot-scope');
    } else if ((slotscope = getandremoveattr(el, 'slot-scope'))) {
      /* istanbul ignore if */
      if (el.attrsmap['v-for']) {
        warn$2(
          "ambiguous combined usage of slot-scope and v-for on <" + (el.tag) + "> " +
          "(v-for takes higher priority). use a wrapper <template> for the " +
          "scoped slot to make it clearer.",
          el.rawattrsmap['slot-scope'],
          true
        );
      }
      el.slotscope = slotscope;
    }

    // slot="xxx"
    var slottarget = getbindingattr(el, 'slot');
    if (slottarget) {
      el.slottarget = slottarget === '""' ? '"default"' : slottarget;
      el.slottargetdynamic = !!(el.attrsmap[':slot'] || el.attrsmap['v-bind:slot']);
      // preserve slot as an attribute for native shadow dom compat
      // only for non-scoped slots.
      if (el.tag !== 'template' && !el.slotscope) {
        addattr(el, 'slot', slottarget, getrawbindingattr(el, 'slot'));
      }
    }

    // 2.6 v-slot syntax
    {
      if (el.tag === 'template') {
        // v-slot on <template>
        var slotbinding = getandremoveattrbyregex(el, slotre);
        if (slotbinding) {
          {
            if (el.slottarget || el.slotscope) {
              warn$2(
                "unexpected mixed usage of different slot syntaxes.",
                el
              );
            }
            if (el.parent && !maybecomponent(el.parent)) {
              warn$2(
                "<template v-slot> can only appear at the root level inside " +
                "the receiving the component",
                el
              );
            }
          }
          var ref = getslotname(slotbinding);
          var name = ref.name;
          var dynamic = ref.dynamic;
          el.slottarget = name;
          el.slottargetdynamic = dynamic;
          el.slotscope = slotbinding.value || emptyslotscopetoken; // force it into a scoped slot for perf
        }
      } else {
        // v-slot on component, denotes default slot
        var slotbinding$1 = getandremoveattrbyregex(el, slotre);
        if (slotbinding$1) {
          {
            if (!maybecomponent(el)) {
              warn$2(
                "v-slot can only be used on components or <template>.",
                slotbinding$1
              );
            }
            if (el.slotscope || el.slottarget) {
              warn$2(
                "unexpected mixed usage of different slot syntaxes.",
                el
              );
            }
            if (el.scopedslots) {
              warn$2(
                "to avoid scope ambiguity, the default slot should also use " +
                "<template> syntax when there are other named slots.",
                slotbinding$1
              );
            }
          }
          // add the component's children to its default slot
          var slots = el.scopedslots || (el.scopedslots = {});
          var ref$1 = getslotname(slotbinding$1);
          var name$1 = ref$1.name;
          var dynamic$1 = ref$1.dynamic;
          var slotcontainer = slots[name$1] = createastelement('template', [], el);
          slotcontainer.slottarget = name$1;
          slotcontainer.slottargetdynamic = dynamic$1;
          slotcontainer.children = el.children.filter(function (c) {
            if (!c.slotscope) {
              c.parent = slotcontainer;
              return true
            }
          });
          slotcontainer.slotscope = slotbinding$1.value || emptyslotscopetoken;
          // remove children as they are returned from scopedslots now
          el.children = [];
          // mark el non-plain so data gets generated
          el.plain = false;
        }
      }
    }
  }

  function getslotname (binding) {
    var name = binding.name.replace(slotre, '');
    if (!name) {
      if (binding.name[0] !== '#') {
        name = 'default';
      } else {
        warn$2(
          "v-slot shorthand syntax requires a slot name.",
          binding
        );
      }
    }
    return dynamicargre.test(name)
      // dynamic [name]
      ? { name: name.slice(1, -1), dynamic: true }
      // static name
      : { name: ("\"" + name + "\""), dynamic: false }
  }

  // handle <slot/> outlets
  function processslotoutlet (el) {
    if (el.tag === 'slot') {
      el.slotname = getbindingattr(el, 'name');
      if (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.",
          getrawbindingattr(el, 'key')
        );
      }
    }
  }

  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, syncgen, isdynamic;
    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.replace(dirre, ''));
        // support .foo shorthand syntax for the .prop modifier
        if (modifiers) {
          name = name.replace(modifierre, '');
        }
        if (bindre.test(name)) { // v-bind
          name = name.replace(bindre, '');
          value = parsefilters(value);
          isdynamic = dynamicargre.test(name);
          if (isdynamic) {
            name = name.slice(1, -1);
          }
          if (
            value.trim().length === 0
          ) {
            warn$2(
              ("the value for a v-bind expression cannot be empty. found in \"v-bind:" + name + "\"")
            );
          }
          if (modifiers) {
            if (modifiers.prop && !isdynamic) {
              name = camelize(name);
              if (name === 'innerhtml') { name = 'innerhtml'; }
            }
            if (modifiers.camel && !isdynamic) {
              name = camelize(name);
            }
            if (modifiers.sync) {
              syncgen = genassignmentcode(value, "$event");
              if (!isdynamic) {
                addhandler(
                  el,
                  ("update:" + (camelize(name))),
                  syncgen,
                  null,
                  false,
                  warn$2,
                  list[i]
                );
                if (hyphenate(name) !== camelize(name)) {
                  addhandler(
                    el,
                    ("update:" + (hyphenate(name))),
                    syncgen,
                    null,
                    false,
                    warn$2,
                    list[i]
                  );
                }
              } else {
                // handler w/ dynamic event name
                addhandler(
                  el,
                  ("\"update:\"+(" + name + ")"),
                  syncgen,
                  null,
                  false,
                  warn$2,
                  list[i],
                  true // dynamic
                );
              }
            }
          }
          if ((modifiers && modifiers.prop) || (
            !el.component && platformmustuseprop(el.tag, el.attrsmap.type, name)
          )) {
            addprop(el, name, value, list[i], isdynamic);
          } else {
            addattr(el, name, value, list[i], isdynamic);
          }
        } else if (onre.test(name)) { // v-on
          name = name.replace(onre, '');
          isdynamic = dynamicargre.test(name);
          if (isdynamic) {
            name = name.slice(1, -1);
          }
          addhandler(el, name, value, modifiers, false, warn$2, list[i], isdynamic);
        } else { // normal directives
          name = name.replace(dirre, '');
          // parse arg
          var argmatch = name.match(argre);
          var arg = argmatch && argmatch[1];
          isdynamic = false;
          if (arg) {
            name = name.slice(0, -(arg.length + 1));
            if (dynamicargre.test(arg)) {
              arg = arg.slice(1, -1);
              isdynamic = true;
            }
          }
          adddirective(el, name, rawname, value, arg, isdynamic, modifiers, list[i]);
          if (name === 'model') {
            checkforaliasmodel(el, value);
          }
        }
      } else {
        // literal attribute
        {
          var res = parsetext(value, delimiters);
          if (res) {
            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">.',
              list[i]
            );
          }
        }
        addattr(el, name, json.stringify(value), list[i]);
        // #6887 firefox doesn't update muted state if set via attribute
        // even immediately after element creation
        if (!el.component &&
            name === 'muted' &&
            platformmustuseprop(el.tag, el.attrsmap.type, name)) {
          addprop(el, name, 'true', list[i]);
        }
      }
    }
  }

  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 (
        map[attrs[i].name] && !isie && !isedge
      ) {
        warn$2('duplicate attribute: ' + attrs[i].name, attrs[i]);
      }
      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.rawattrsmap['v-model']
        );
      }
      _el = _el.parent;
    }
  }

  /*  */

  function pretransformnode (el, options) {
    if (el.tag === 'input') {
      var map = el.attrsmap;
      if (!map['v-model']) {
        return
      }

      var typebinding;
      if (map[':type'] || map['v-bind:type']) {
        typebinding = getbindingattr(el, 'type');
      }
      if (!map.type && !typebinding && map['v-bind']) {
        typebinding = "(" + (map['v-bind']) + ").type";
      }

      if (typebinding) {
        var ifcondition = getandremoveattr(el, 'v-if', true);
        var ifconditionextra = ifcondition ? ("&&(" + ifcondition + ")") : "";
        var haselse = getandremoveattr(el, 'v-else', true) != null;
        var elseifcondition = getandremoveattr(el, 'v-else-if', true);
        // 1. checkbox
        var branch0 = cloneastelement(el);
        // process for on the main node
        processfor(branch0);
        addrawattr(branch0, 'type', 'checkbox');
        processelement(branch0, options);
        branch0.processed = true; // prevent it from double-processed
        branch0.if = "(" + typebinding + ")==='checkbox'" + ifconditionextra;
        addifcondition(branch0, {
          exp: branch0.if,
          block: branch0
        });
        // 2. add radio else-if condition
        var branch1 = cloneastelement(el);
        getandremoveattr(branch1, 'v-for', true);
        addrawattr(branch1, 'type', 'radio');
        processelement(branch1, options);
        addifcondition(branch0, {
          exp: "(" + typebinding + ")==='radio'" + ifconditionextra,
          block: branch1
        });
        // 3. other
        var branch2 = cloneastelement(el);
        getandremoveattr(branch2, 'v-for', true);
        addrawattr(branch2, ':type', typebinding);
        processelement(branch2, options);
        addifcondition(branch0, {
          exp: ifcondition,
          block: branch2
        });

        if (haselse) {
          branch0.else = true;
        } else if (elseifcondition) {
          branch0.elseif = elseifcondition;
        }

        return branch0
      }
    }
  }

  function cloneastelement (el) {
    return createastelement(el.tag, el.attrslist.slice(), el.parent)
  }

  var model$1 = {
    pretransformnode: pretransformnode
  };

  var modules$1 = [
    klass$1,
    style$1,
    model$1
  ];

  /*  */

  function text (el, dir) {
    if (dir.value) {
      addprop(el, 'textcontent', ("_s(" + (dir.value) + ")"), dir);
    }
  }

  /*  */

  function html (el, dir) {
    if (dir.value) {
      addprop(el, 'innerhtml', ("_s(" + (dir.value) + ")"), dir);
    }
  }

  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 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,start,end,rawattrsmap' +
      (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;
        }
      }
      if (node.ifconditions) {
        for (var i$1 = 1, l$1 = node.ifconditions.length; i$1 < l$1; i$1++) {
          var block = node.ifconditions[i$1].block;
          markstatic$1(block);
          if (!block.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) {
        for (var i$1 = 1, l$1 = node.ifconditions.length; i$1 < l$1; i$1++) {
          markstaticroots(node.ifconditions[i$1].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 = /^([\w$_]+|\([^)]*?\))\s*=>|^function\s*(?:[\w$]+)?\s*\(/;
  var fninvokere = /\([^)]*?\);*$/;
  var simplepathre = /^[a-za-z_$][\w$]*(?:\.[a-za-z_$][\w$]*|\['[^']*?']|\["[^"]*?"]|\[\d+]|\[[a-za-z_$][\w$]*])*$/;

  // keyboardevent.keycode aliases
  var keycodes = {
    esc: 27,
    tab: 9,
    enter: 13,
    space: 32,
    up: 38,
    left: 37,
    right: 39,
    down: 40,
    'delete': [8, 46]
  };

  // keyboardevent.key aliases
  var keynames = {
    // #7880: ie11 and edge use `esc` for escape key name.
    esc: ['esc', 'escape'],
    tab: 'tab',
    enter: 'enter',
    // #9112: ie11 uses `spacebar` for space key name.
    space: [' ', 'spacebar'],
    // #7806: ie11 uses key names without `arrow` prefix for arrow keys.
    up: ['up', 'arrowup'],
    left: ['left', 'arrowleft'],
    right: ['right', 'arrowright'],
    down: ['down', 'arrowdown'],
    // #9112: ie11 uses `del` for delete key name.
    'delete': ['backspace', 'delete', 'del']
  };

  // #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,
    isnative
  ) {
    var prefix = isnative ? 'nativeon:' : 'on:';
    var statichandlers = "";
    var dynamichandlers = "";
    for (var name in events) {
      var handlercode = genhandler(events[name]);
      if (events[name] && events[name].dynamic) {
        dynamichandlers += name + "," + handlercode + ",";
      } else {
        statichandlers += "\"" + name + "\":" + handlercode + ",";
      }
    }
    statichandlers = "{" + (statichandlers.slice(0, -1)) + "}";
    if (dynamichandlers) {
      return prefix + "_d(" + statichandlers + ",[" + (dynamichandlers.slice(0, -1)) + "])"
    } else {
      return prefix + statichandlers
    }
  }

  function genhandler (handler) {
    if (!handler) {
      return 'function(){}'
    }

    if (array.isarray(handler)) {
      return ("[" + (handler.map(function (handler) { return genhandler(handler); }).join(',')) + "]")
    }

    var ismethodpath = simplepathre.test(handler.value);
    var isfunctionexpression = fnexpre.test(handler.value);
    var isfunctioninvocation = simplepathre.test(handler.value.replace(fninvokere, ''));

    if (!handler.modifiers) {
      if (ismethodpath || isfunctionexpression) {
        return handler.value
      }
      return ("function($event){" + (isfunctioninvocation ? ("return " + (handler.value)) : handler.value) + "}") // inline statement
    } else {
      var code = '';
      var genmodifiercode = '';
      var keys = [];
      for (var key in handler.modifiers) {
        if (modifiercode[key]) {
          genmodifiercode += modifiercode[key];
          // left/right
          if (keycodes[key]) {
            keys.push(key);
          }
        } else if (key === 'exact') {
          var modifiers = (handler.modifiers);
          genmodifiercode += genguard(
            ['ctrl', 'shift', 'alt', 'meta']
              .filter(function (keymodifier) { return !modifiers[keymodifier]; })
              .map(function (keymodifier) { return ("$event." + keymodifier + "key"); })
              .join('||')
          );
        } 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
        ? ("return " + (handler.value) + "($event)")
        : isfunctionexpression
          ? ("return (" + (handler.value) + ")($event)")
          : isfunctioninvocation
            ? ("return " + (handler.value))
            : handler.value;
      return ("function($event){" + code + handlercode + "}")
    }
  }

  function genkeyfilter (keys) {
    return (
      // make sure the key filters only apply to keyboardevents
      // #9441: can't use 'keycode' in $event because chrome autofill fires fake
      // key events that do not have keycode property...
      "if(!$event.type.indexof('key')&&" +
      (keys.map(genfiltercode).join('&&')) + ")return null;"
    )
  }

  function genfiltercode (key) {
    var keyval = parseint(key, 10);
    if (keyval) {
      return ("$event.keycode!==" + keyval)
    }
    var keycode = keycodes[key];
    var keyname = keynames[key];
    return (
      "_k($event.keycode," +
      (json.stringify(key)) + "," +
      (json.stringify(keycode)) + "," +
      "$event.key," +
      "" + (json.stringify(keyname)) +
      ")"
    )
  }

  /*  */

  function on (el, dir) {
    if (dir.modifiers) {
      warn("v-on without argument does not support modifiers.");
    }
    el.wraplisteners = function (code) { return ("_g(" + code + "," + (dir.value) + ")"); };
  }

  /*  */

  function bind$1 (el, dir) {
    el.wrapdata = function (code) {
      return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + "," + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + ")")
    };
  }

  /*  */

  var basedirectives = {
    on: on,
    bind: bind$1,
    cloak: noop
  };

  /*  */





  var codegenstate = function codegenstate (options) {
    this.options = options;
    this.warn = options.warn || basewarn;
    this.transforms = pluckmodulefunction(options.modules, 'transformcode');
    this.datagenfns = pluckmodulefunction(options.modules, 'gendata');
    this.directives = extend(extend({}, basedirectives), options.directives);
    var isreservedtag = options.isreservedtag || no;
    this.maybecomponent = function (el) { return !!el.component || !isreservedtag(el.tag); };
    this.onceid = 0;
    this.staticrenderfns = [];
    this.pre = false;
  };



  function generate (
    ast,
    options
  ) {
    var state = new codegenstate(options);
    var code = ast ? genelement(ast, state) : '_c("div")';
    return {
      render: ("with(this){return " + code + "}"),
      staticrenderfns: state.staticrenderfns
    }
  }

  function genelement (el, state) {
    if (el.parent) {
      el.pre = el.pre || el.parent.pre;
    }

    if (el.staticroot && !el.staticprocessed) {
      return genstatic(el, state)
    } else if (el.once && !el.onceprocessed) {
      return genonce(el, state)
    } else if (el.for && !el.forprocessed) {
      return genfor(el, state)
    } else if (el.if && !el.ifprocessed) {
      return genif(el, state)
    } else if (el.tag === 'template' && !el.slottarget && !state.pre) {
      return genchildren(el, state) || 'void 0'
    } else if (el.tag === 'slot') {
      return genslot(el, state)
    } else {
      // component or element
      var code;
      if (el.component) {
        code = gencomponent(el.component, el, state);
      } else {
        var data;
        if (!el.plain || (el.pre && state.maybecomponent(el))) {
          data = gendata$2(el, state);
        }

        var children = el.inlinetemplate ? null : genchildren(el, state, true);
        code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
      }
      // module transforms
      for (var i = 0; i < state.transforms.length; i++) {
        code = state.transforms[i](el, code);
      }
      return code
    }
  }

  // hoist static sub-trees out
  function genstatic (el, state) {
    el.staticprocessed = true;
    // some elements (templates) need to behave differently inside of a v-pre
    // node.  all pre nodes are static roots, so we can use this as a location to
    // wrap a state change and reset it upon exiting the pre node.
    var originalprestate = state.pre;
    if (el.pre) {
      state.pre = el.pre;
    }
    state.staticrenderfns.push(("with(this){return " + (genelement(el, state)) + "}"));
    state.pre = originalprestate;
    return ("_m(" + (state.staticrenderfns.length - 1) + (el.staticinfor ? ',true' : '') + ")")
  }

  // v-once
  function genonce (el, state) {
    el.onceprocessed = true;
    if (el.if && !el.ifprocessed) {
      return genif(el, state)
    } else if (el.staticinfor) {
      var key = '';
      var parent = el.parent;
      while (parent) {
        if (parent.for) {
          key = parent.key;
          break
        }
        parent = parent.parent;
      }
      if (!key) {
        state.warn(
          "v-once can only be used inside v-for that is keyed. ",
          el.rawattrsmap['v-once']
        );
        return genelement(el, state)
      }
      return ("_o(" + (genelement(el, state)) + "," + (state.onceid++) + "," + key + ")")
    } else {
      return genstatic(el, state)
    }
  }

  function genif (
    el,
    state,
    altgen,
    altempty
  ) {
    el.ifprocessed = true; // avoid recursion
    return genifconditions(el.ifconditions.slice(), state, altgen, altempty)
  }

  function genifconditions (
    conditions,
    state,
    altgen,
    altempty
  ) {
    if (!conditions.length) {
      return altempty || '_e()'
    }

    var condition = conditions.shift();
    if (condition.exp) {
      return ("(" + (condition.exp) + ")?" + (genternaryexp(condition.block)) + ":" + (genifconditions(conditions, state, altgen, altempty)))
    } else {
      return ("" + (genternaryexp(condition.block)))
    }

    // v-if with v-once should generate code like (a)?_m(0):_m(1)
    function genternaryexp (el) {
      return altgen
        ? altgen(el, state)
        : el.once
          ? genonce(el, state)
          : genelement(el, state)
    }
  }

  function genfor (
    el,
    state,
    altgen,
    althelper
  ) {
    var exp = el.for;
    var alias = el.alias;
    var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
    var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';

    if (state.maybecomponent(el) &&
      el.tag !== 'slot' &&
      el.tag !== 'template' &&
      !el.key
    ) {
      state.warn(
        "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
        "v-for should have explicit keys. " +
        "see  .",
        el.rawattrsmap['v-for'],
        true /* tip */
      );
    }

    el.forprocessed = true; // avoid recursion
    return (althelper || '_l') + "((" + exp + ")," +
      "function(" + alias + iterator1 + iterator2 + "){" +
        "return " + ((altgen || genelement)(el, state)) +
      '})'
  }

  function gendata$2 (el, state) {
    var data = '{';

    // directives first.
    // directives may mutate the el's other properties before they are generated.
    var dirs = gendirectives(el, state);
    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 < state.datagenfns.length; i++) {
      data += state.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)) + ",";
    }
    if (el.nativeevents) {
      data += (genhandlers(el.nativeevents, true)) + ",";
    }
    // slot target
    // only for non-scoped slots
    if (el.slottarget && !el.slotscope) {
      data += "slot:" + (el.slottarget) + ",";
    }
    // scoped slots
    if (el.scopedslots) {
      data += (genscopedslots(el, el.scopedslots, state)) + ",";
    }
    // 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, state);
      if (inlinetemplate) {
        data += inlinetemplate + ",";
      }
    }
    data = data.replace(/,$/, '') + '}';
    // v-bind dynamic argument wrap
    // v-bind with dynamic arguments must be applied using the same v-bind object
    // merge helper so that class/style/mustuseprop attrs are handled correctly.
    if (el.dynamicattrs) {
      data = "_b(" + data + ",\"" + (el.tag) + "\"," + (genprops(el.dynamicattrs)) + ")";
    }
    // v-bind data wrap
    if (el.wrapdata) {
      data = el.wrapdata(data);
    }
    // v-on data wrap
    if (el.wraplisteners) {
      data = el.wraplisteners(data);
    }
    return data
  }

  function gendirectives (el, state) {
    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 = state.directives[dir.name];
      if (gen) {
        // compile-time directive that manipulates ast.
        // returns true if it also needs a runtime counterpart.
        needruntime = !!gen(el, dir, state.warn);
      }
      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.isdynamicarg ? dir.arg : ("\"" + (dir.arg) + "\""))) : '') + (dir.modifiers ? (",modifiers:" + (json.stringify(dir.modifiers))) : '') + "},";
      }
    }
    if (hasruntime) {
      return res.slice(0, -1) + ']'
    }
  }

  function geninlinetemplate (el, state) {
    var ast = el.children[0];
    if (el.children.length !== 1 || ast.type !== 1) {
      state.warn(
        'inline-template components must have exactly one child element.',
        { start: el.start }
      );
    }
    if (ast && ast.type === 1) {
      var inlinerenderfns = generate(ast, state.options);
      return ("inlinetemplate:{render:function(){" + (inlinerenderfns.render) + "},staticrenderfns:[" + (inlinerenderfns.staticrenderfns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
    }
  }

  function genscopedslots (
    el,
    slots,
    state
  ) {
    // by default scoped slots are considered "stable", this allows child
    // components with only scoped slots to skip forced updates from parent.
    // but in some cases we have to bail-out of this optimization
    // for example if the slot contains dynamic names, has v-if or v-for on them...
    var needsforceupdate = el.for || object.keys(slots).some(function (key) {
      var slot = slots[key];
      return (
        slot.slottargetdynamic ||
        slot.if ||
        slot.for ||
        containsslotchild(slot) // is passing down slot from parent which may be dynamic
      )
    });

    // #9534: if a component with scoped slots is inside a conditional branch,
    // it's possible for the same component to be reused but with different
    // compiled slot content. to avoid that, we generate a unique key based on
    // the generated code of all the slot contents.
    var needskey = !!el.if;

    // or when it is inside another scoped slot or v-for (the reactivity may be
    // disconnected due to the intermediate scope variable)
    // #9438, #9506
    // todo: this can be further optimized by properly analyzing in-scope bindings
    // and skip force updating ones that do not actually use scope variables.
    if (!needsforceupdate) {
      var parent = el.parent;
      while (parent) {
        if (
          (parent.slotscope && parent.slotscope !== emptyslotscopetoken) ||
          parent.for
        ) {
          needsforceupdate = true;
          break
        }
        if (parent.if) {
          needskey = true;
        }
        parent = parent.parent;
      }
    }

    var generatedslots = object.keys(slots)
      .map(function (key) { return genscopedslot(slots[key], state); })
      .join(',');

    return ("scopedslots:_u([" + generatedslots + "]" + (needsforceupdate ? ",null,true" : "") + (!needsforceupdate && needskey ? (",null,false," + (hash(generatedslots))) : "") + ")")
  }

  function hash(str) {
    var hash = 5381;
    var i = str.length;
    while(i) {
      hash = (hash * 33) ^ str.charcodeat(--i);
    }
    return hash >>> 0
  }

  function containsslotchild (el) {
    if (el.type === 1) {
      if (el.tag === 'slot') {
        return true
      }
      return el.children.some(containsslotchild)
    }
    return false
  }

  function genscopedslot (
    el,
    state
  ) {
    var islegacysyntax = el.attrsmap['slot-scope'];
    if (el.if && !el.ifprocessed && !islegacysyntax) {
      return genif(el, state, genscopedslot, "null")
    }
    if (el.for && !el.forprocessed) {
      return genfor(el, state, genscopedslot)
    }
    var slotscope = el.slotscope === emptyslotscopetoken
      ? ""
      : string(el.slotscope);
    var fn = "function(" + slotscope + "){" +
      "return " + (el.tag === 'template'
        ? el.if && islegacysyntax
          ? ("(" + (el.if) + ")?" + (genchildren(el, state) || 'undefined') + ":undefined")
          : genchildren(el, state) || 'undefined'
        : genelement(el, state)) + "}";
    // reverse proxy v-slot without scope on this.$slots
    var reverseproxy = slotscope ? "" : ",proxy:true";
    return ("{key:" + (el.slottarget || "\"default\"") + ",fn:" + fn + reverseproxy + "}")
  }

  function genchildren (
    el,
    state,
    checkskip,
    altgenelement,
    altgennode
  ) {
    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'
      ) {
        var normalizationtype = checkskip
          ? state.maybecomponent(el$1) ? ",1" : ",0"
          : "";
        return ("" + ((altgenelement || genelement)(el$1, state)) + normalizationtype)
      }
      var normalizationtype$1 = checkskip
        ? getnormalizationtype(children, state.maybecomponent)
        : 0;
      var gen = altgennode || gennode;
      return ("[" + (children.map(function (c) { return gen(c, state); }).join(',')) + "]" + (normalizationtype$1 ? ("," + normalizationtype$1) : ''))
    }
  }

  // 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,
    maybecomponent
  ) {
    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 gennode (node, state) {
    if (node.type === 1) {
      return genelement(node, state)
    } else if (node.type === 3 && node.iscomment) {
      return gencomment(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 gencomment (comment) {
    return ("_e(" + (json.stringify(comment.text)) + ")")
  }

  function genslot (el, state) {
    var slotname = el.slotname || '"default"';
    var children = genchildren(el, state);
    var res = "_t(" + slotname + (children ? ("," + children) : '');
    var attrs = el.attrs || el.dynamicattrs
      ? genprops((el.attrs || []).concat(el.dynamicattrs || []).map(function (attr) { return ({
          // slot props are camelized
          name: camelize(attr.name),
          value: attr.value,
          dynamic: attr.dynamic
        }); }))
      : null;
    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,
    state
  ) {
    var children = el.inlinetemplate ? null : genchildren(el, state, true);
    return ("_c(" + componentname + "," + (gendata$2(el, state)) + (children ? ("," + children) : '') + ")")
  }

  function genprops (props) {
    var staticprops = "";
    var dynamicprops = "";
    for (var i = 0; i < props.length; i++) {
      var prop = props[i];
      var value = transformspecialnewlines(prop.value);
      if (prop.dynamic) {
        dynamicprops += (prop.name) + "," + value + ",";
      } else {
        staticprops += "\"" + (prop.name) + "\":" + value + ",";
      }
    }
    staticprops = "{" + (staticprops.slice(0, -1)) + "}";
    if (dynamicprops) {
      return ("_d(" + staticprops + ",[" + (dynamicprops.slice(0, -1)) + "])")
    } else {
      return staticprops
    }
  }

  // #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*\\([^\\)]*\\)');

  // strip strings in expressions
  var stripstringre = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;

  // detect problematic expressions in a template
  function detecterrors (ast, warn) {
    if (ast) {
      checknode(ast, warn);
    }
  }

  function checknode (node, warn) {
    if (node.type === 1) {
      for (var name in node.attrsmap) {
        if (dirre.test(name)) {
          var value = node.attrsmap[name];
          if (value) {
            var range = node.rawattrsmap[name];
            if (name === 'v-for') {
              checkfor(node, ("v-for=\"" + value + "\""), warn, range);
            } else if (onre.test(name)) {
              checkevent(value, (name + "=\"" + value + "\""), warn, range);
            } else {
              checkexpression(value, (name + "=\"" + value + "\""), warn, range);
            }
          }
        }
      }
      if (node.children) {
        for (var i = 0; i < node.children.length; i++) {
          checknode(node.children[i], warn);
        }
      }
    } else if (node.type === 2) {
      checkexpression(node.expression, node.text, warn, node);
    }
  }

  function checkevent (exp, text, warn, range) {
    var stipped = exp.replace(stripstringre, '');
    var keywordmatch = stipped.match(unaryoperatorsre);
    if (keywordmatch && stipped.charat(keywordmatch.index - 1) !== '$') {
      warn(
        "avoid using javascript unary operator as property name: " +
        "\"" + (keywordmatch[0]) + "\" in expression " + (text.trim()),
        range
      );
    }
    checkexpression(exp, text, warn, range);
  }

  function checkfor (node, text, warn, range) {
    checkexpression(node.for || '', text, warn, range);
    checkidentifier(node.alias, 'v-for alias', text, warn, range);
    checkidentifier(node.iterator1, 'v-for iterator', text, warn, range);
    checkidentifier(node.iterator2, 'v-for iterator', text, warn, range);
  }

  function checkidentifier (
    ident,
    type,
    text,
    warn,
    range
  ) {
    if (typeof ident === 'string') {
      try {
        new function(("var " + ident + "=_"));
      } catch (e) {
        warn(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())), range);
      }
    }
  }

  function checkexpression (exp, text, warn, range) {
    try {
      new function(("return " + exp));
    } catch (e) {
      var keywordmatch = exp.replace(stripstringre, '').match(prohibitedkeywordre);
      if (keywordmatch) {
        warn(
          "avoid using javascript keyword as property name: " +
          "\"" + (keywordmatch[0]) + "\"\n  raw expression: " + (text.trim()),
          range
        );
      } else {
        warn(
          "invalid expression: " + (e.message) + " in\n\n" +
          "    " + exp + "\n\n" +
          "  raw expression: " + (text.trim()) + "\n",
          range
        );
      }
    }
  }

  /*  */

  var range = 2;

  function generatecodeframe (
    source,
    start,
    end
  ) {
    if ( start === void 0 ) start = 0;
    if ( end === void 0 ) end = source.length;

    var lines = source.split(/\r?\n/);
    var count = 0;
    var res = [];
    for (var i = 0; i < lines.length; i++) {
      count += lines[i].length + 1;
      if (count >= start) {
        for (var j = i - range; j <= i + range || end > count; j++) {
          if (j < 0 || j >= lines.length) { continue }
          res.push(("" + (j + 1) + (repeat$1(" ", 3 - string(j + 1).length)) + "|  " + (lines[j])));
          var linelength = lines[j].length;
          if (j === i) {
            // push underline
            var pad = start - (count - linelength) + 1;
            var length = end > count ? linelength - pad : end - start;
            res.push("   |  " + repeat$1(" ", pad) + repeat$1("^", length));
          } else if (j > i) {
            if (end > count) {
              var length$1 = math.min(end - count, linelength);
              res.push("   |  " + repeat$1("^", length$1));
            }
            count += linelength + 1;
          }
        }
        break
      }
    }
    return res.join('\n')
  }

  function repeat$1 (str, n) {
    var result = '';
    if (n > 0) {
      while (true) { // eslint-disable-line
        if (n & 1) { result += str; }
        n >>>= 1;
        if (n <= 0) { break }
        str += str;
      }
    }
    return result
  }

  /*  */



  function createfunction (code, errors) {
    try {
      return new function(code)
    } catch (err) {
      errors.push({ err: err, code: code });
      return noop
    }
  }

  function createcompiletofunctionfn (compile) {
    var cache = object.create(null);

    return function compiletofunctions (
      template,
      options,
      vm
    ) {
      options = extend({}, options);
      var warn$$1 = options.warn || warn;
      delete options.warn;

      /* istanbul ignore if */
      {
        // detect possible csp restriction
        try {
          new function('return 1');
        } catch (e) {
          if (e.tostring().match(/unsafe-eval|csp/)) {
            warn$$1(
              '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 (cache[key]) {
        return cache[key]
      }

      // compile
      var compiled = compile(template, options);

      // check compilation errors/tips
      {
        if (compiled.errors && compiled.errors.length) {
          if (options.outputsourcerange) {
            compiled.errors.foreach(function (e) {
              warn$$1(
                "error compiling template:\n\n" + (e.msg) + "\n\n" +
                generatecodeframe(template, e.start, e.end),
                vm
              );
            });
          } else {
            warn$$1(
              "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) {
          if (options.outputsourcerange) {
            compiled.tips.foreach(function (e) { return tip(e.msg, vm); });
          } else {
            compiled.tips.foreach(function (msg) { return tip(msg, vm); });
          }
        }
      }

      // turn code into functions
      var res = {};
      var fngenerrors = [];
      res.render = createfunction(compiled.render, fngenerrors);
      res.staticrenderfns = compiled.staticrenderfns.map(function (code) {
        return createfunction(code, 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$$1(
            "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 (cache[key] = res)
    }
  }

  /*  */

  function createcompilercreator (basecompile) {
    return function createcompiler (baseoptions) {
      function compile (
        template,
        options
      ) {
        var finaloptions = object.create(baseoptions);
        var errors = [];
        var tips = [];

        var warn = function (msg, range, tip) {
          (tip ? tips : errors).push(msg);
        };

        if (options) {
          if (options.outputsourcerange) {
            // $flow-disable-line
            var leadingspacelength = template.match(/^\s*/)[0].length;

            warn = function (msg, range, tip) {
              var data = { msg: msg };
              if (range) {
                if (range.start != null) {
                  data.start = range.start + leadingspacelength;
                }
                if (range.end != null) {
                  data.end = range.end + leadingspacelength;
                }
              }
              (tip ? tips : errors).push(data);
            };
          }
          // 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 || null),
              options.directives
            );
          }
          // copy other options
          for (var key in options) {
            if (key !== 'modules' && key !== 'directives') {
              finaloptions[key] = options[key];
            }
          }
        }

        finaloptions.warn = warn;

        var compiled = basecompile(template.trim(), finaloptions);
        {
          detecterrors(compiled.ast, warn);
        }
        compiled.errors = errors;
        compiled.tips = tips;
        return compiled
      }

      return {
        compile: compile,
        compiletofunctions: createcompiletofunctionfn(compile)
      }
    }
  }

  /*  */

  // `createcompilercreator` allows creating compilers that use alternative
  // parser/optimizer/codegen, e.g the ssr optimizing compiler.
  // here we just export a default compiler using the default parts.
  var createcompiler = createcompilercreator(function basecompile (
    template,
    options
  ) {
    var ast = parse(template.trim(), options);
    if (options.optimize !== false) {
      optimize(ast, options);
    }
    var code = generate(ast, options);
    return {
      ast: ast,
      render: code.render,
      staticrenderfns: code.staticrenderfns
    }
  });

  /*  */

  var ref$1 = createcompiler(baseoptions);
  var compile = ref$1.compile;
  var compiletofunctions = ref$1.compiletofunctions;

  /*  */

  // check whether current browser encodes a char inside attribute values
  var div;
  function getshoulddecode (href) {
    div = div || document.createelement('div');
    div.innerhtml = href ? "<a href=\"\n\"/>" : "<div a=\"\n\"/>";
    return div.innerhtml.indexof('&#10;') > 0
  }

  // #3663: ie encodes newlines inside attribute values while other browsers don't
  var shoulddecodenewlines = inbrowser ? getshoulddecode(false) : false;
  // #6828: chrome encodes content in a[href]
  var shoulddecodenewlinesforhref = inbrowser ? getshoulddecode(true) : false;

  /*  */

  var idtotemplate = cached(function (id) {
    var el = query(id);
    return el && el.innerhtml
  });

  var mount = vue.prototype.$mount;
  vue.prototype.$mount = function (
    el,
    hydrating
  ) {
    el = el && query(el);

    /* istanbul ignore if */
    if (el === document.body || el === document.documentelement) {
      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 (!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 (config.performance && mark) {
          mark('compile');
        }

        var ref = compiletofunctions(template, {
          outputsourcerange: "development" !== 'production',
          shoulddecodenewlines: shoulddecodenewlines,
          shoulddecodenewlinesforhref: shoulddecodenewlinesforhref,
          delimiters: options.delimiters,
          comments: options.comments
        }, this);
        var render = ref.render;
        var staticrenderfns = ref.staticrenderfns;
        options.render = render;
        options.staticrenderfns = staticrenderfns;

        /* istanbul ignore if */
        if (config.performance && mark) {
          mark('compile end');
          measure(("vue " + (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.compile = compiletofunctions;

  return vue;

}));