build.js

/******/
(function (modules) { // webpackBootstrap
    /******/ // The module cache
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    var installedModules = {};
    /******/
    /******/ // The require function
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        modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
        /******/
        /******/ // Flag the module as loaded
        /******/
        module.l = true;
        /******/
        /******/ // Return the exports of the module
        /******/
        return module.exports;
        /******/
    }
    /******/
    /******/
    /******/ // expose the modules object (__webpack_modules__)
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    __webpack_require__.m = modules;
    /******/
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    __webpack_require__.c = installedModules;
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/************************************************************************/
/******/
([
    /* 0 */
    /***/
    (function (module, exports) {

        var g;

        // This works in non-strict mode
        g = (function () {
            return this;
        })();

        try {
            // This works if eval is allowed (see CSP)
            g = g || Function("return this")() || (1, eval)("this");
        } catch (e) {
            // This works if the window reference is available
            if (typeof window === "object")
                g = window;
        }

        // g can still be undefined, but nothing to do about it...
        // We return undefined, instead of nothing here, so it's
        // easier to handle this case. if(!global) { ...}
        module.exports = g;


        /***/
    }),
    /* 1 */
    /***/
    (function (module, __webpack_exports__, __webpack_require__) {

        "use strict";
        Object.defineProperty(__webpack_exports__, "__esModule", {
            value: true
        });
        /* harmony import */
        var __WEBPACK_IMPORTED_MODULE_0_vue__ = __webpack_require__(2);
        /* harmony import */
        var __WEBPACK_IMPORTED_MODULE_1__App_vue__ = __webpack_require__(6);



        new __WEBPACK_IMPORTED_MODULE_0_vue__["a" /* default */ ]({
            el: '#app',
            template: '<App/>',
            components: {
                App: __WEBPACK_IMPORTED_MODULE_1__App_vue__["a" /* default */ ]
            }
        });

        /***/
    }),
    /* 2 */
    /***/
    (function (module, __webpack_exports__, __webpack_require__) {

        "use strict";
        /* WEBPACK VAR INJECTION */
        (function (global, setImmediate) {
            /*!
             * Vue.js v2.5.9
             * (c) 2014-2017 Evan You
             * Released under the MIT License.
             */
            /*  */

            var emptyObject = Object.freeze({});

            // these helpers produces better vm code in JS engines due to their
            // explicitness and function inlining
            function isUndef(v) {
                return v === undefined || v === null
            }

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

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

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

            /**
             * Check if value is primitive
             */
            function isPrimitive(value) {
                return (
                    typeof value === 'string' ||
                    typeof value === 'number' ||
                    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)
            }

            /**
             * Convert a value to a string that is actually rendered.
             */
            function toString(val) {
                return val == null ?
                    '' :
                    typeof val === 'object' ?
                    JSON.stringify(val, null, 2) :
                    String(val)
            }

            /**
             * Convert a input value to a number for persistence.
             * If the conversion fails, return original string.
             */
            function toNumber(val) {
                var n = parseFloat(val);
                return isNaN(n) ? val : n
            }

            /**
             * Make a map and return a function for checking if a key
             * is in that map.
             */
            function makeMap(
                str,
                expectsLowerCase
            ) {
                var map = Object.create(null);
                var list = str.split(',');
                for (var i = 0; i < list.length; i++) {
                    map[list[i]] = true;
                }
                return expectsLowerCase ?
                    function (val) {
                        return map[val.toLowerCase()];
                    } :
                    function (val) {
                        return map[val];
                    }
            }

            /**
             * Check if a tag is a built-in tag.
             */
            var isBuiltInTag = makeMap('slot,component', true);

            /**
             * Check if a 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 the object has the property.
             */
            var hasOwnProperty = Object.prototype.hasOwnProperty;

            function hasOwn(obj, key) {
                return hasOwnProperty.call(obj, key)
            }

            /**
             * Create a cached version of a pure function.
             */
            function cached(fn) {
                var cache = Object.create(null);
                return (function cachedFn(str) {
                    var hit = cache[str];
                    return hit || (cache[str] = fn(str))
                })
            }

            /**
             * Camelize a hyphen-delimited string.
             */
            var camelizeRE = /-(\w)/g;
            var camelize = cached(function (str) {
                return str.replace(camelizeRE, function (_, c) {
                    return c ? c.toUpperCase() : '';
                })
            });

            /**
             * Capitalize a string.
             */
            var capitalize = cached(function (str) {
                return str.charAt(0).toUpperCase() + str.slice(1)
            });

            /**
             * Hyphenate a camelCase string.
             */
            var hyphenateRE = /\B([A-Z])/g;
            var hyphenate = cached(function (str) {
                return str.replace(hyphenateRE, '-$1').toLowerCase()
            });

            /**
             * Simple bind, faster than native
             */
            function bind(fn, ctx) {
                function boundFn(a) {
                    var l = arguments.length;
                    return l ?
                        l > 1 ?
                        fn.apply(ctx, arguments) :
                        fn.call(ctx, a) :
                        fn.call(ctx)
                }
                // record original fn length
                boundFn._length = fn.length;
                return boundFn
            }

            /**
             * Convert an Array-like object to a real Array.
             */
            function toArray(list, start) {
                start = start || 0;
                var i = list.length - start;
                var ret = new Array(i);
                while (i--) {
                    ret[i] = list[i + start];
                }
                return ret
            }

            /**
             * Mix properties into target object.
             */
            function extend(to, _from) {
                for (var key in _from) {
                    to[key] = _from[key];
                }
                return to
            }

            /**
             * Merge an Array of Objects into a single Object.
             */
            function toObject(arr) {
                var res = {};
                for (var i = 0; i < arr.length; i++) {
                    if (arr[i]) {
                        extend(res, arr[i]);
                    }
                }
                return res
            }

            /**
             * Perform no operation.
             * Stubbing args to make Flow happy without leaving useless transpiled code
             * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/)
             */
            function noop(a, b, c) {}

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

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

            /**
             * Generate a static keys string from compiler modules.
             */
            function genStaticKeys(modules) {
                return modules.reduce(function (keys, m) {
                    return keys.concat(m.staticKeys || [])
                }, []).join(',')
            }

            /**
             * Check if two values are loosely equal - that is,
             * if they are plain objects, do they have the same shape?
             */
            function looseEqual(a, b) {
                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 (!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
                }
            }

            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'
            ];

            /*  */

            var config = ({
                /**
                 * Option merge strategies (used in core/util/options)
                 */
                optionMergeStrategies: Object.create(null),

                /**
                 * Whether to suppress warnings.
                 */
                silent: false,

                /**
                 * Show production mode tip message on boot?
                 */
                productionTip: "production" !== 'production',

                /**
                 * Whether to enable devtools
                 */
                devtools: "production" !== 'production',

                /**
                 * Whether to record perf
                 */
                performance: false,

                /**
                 * Error handler for watcher errors
                 */
                errorHandler: null,

                /**
                 * Warn handler for watcher warns
                 */
                warnHandler: null,

                /**
                 * Ignore certain custom elements
                 */
                ignoredElements: [],

                /**
                 * Custom user key aliases for v-on
                 */
                keyCodes: Object.create(null),

                /**
                 * Check if a tag is reserved so that it cannot be registered as a
                 * component. This is platform-dependent and may be overwritten.
                 */
                isReservedTag: no,

                /**
                 * Check if an attribute is reserved so that it cannot be used as a component
                 * prop. This is platform-dependent and may be overwritten.
                 */
                isReservedAttr: no,

                /**
                 * Check if a tag is an unknown element.
                 * Platform-dependent.
                 */
                isUnknownElement: no,

                /**
                 * Get the namespace of an element
                 */
                getTagNamespace: noop,

                /**
                 * Parse the real tag name for the specific platform.
                 */
                parsePlatformTagName: identity,

                /**
                 * Check if an attribute must be bound using property, e.g. value
                 * Platform-dependent.
                 */
                mustUseProp: no,

                /**
                 * Exposed for legacy reasons
                 */
                _lifecycleHooks: LIFECYCLE_HOOKS
            });

            /*  */

            /**
             * Check if a string starts with $ or _
             */
            function isReserved(str) {
                var c = (str + '').charCodeAt(0);
                return c === 0x24 || c === 0x5F
            }

            /**
             * Define a property.
             */
            function def(obj, key, val, enumerable) {
                Object.defineProperty(obj, key, {
                    value: val,
                    enumerable: !!enumerable,
                    writable: true,
                    configurable: true
                });
            }

            /**
             * Parse simple path.
             */
            var bailRE = /[^\w.$]/;

            function parsePath(path) {
                if (bailRE.test(path)) {
                    return
                }
                var segments = path.split('.');
                return function (obj) {
                    for (var i = 0; i < segments.length; i++) {
                        if (!obj) {
                            return
                        }
                        obj = obj[segments[i]];
                    }
                    return obj
                }
            }

            /*  */


            // 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;

            // 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;
                        }
                    })); // https://github.com/facebook/flow/issues/285
                    window.addEventListener('test-passive', null, opts);
                } catch (e) {}
            }

            // this needs to be lazy-evaled because vue may be required before
            // vue-server-renderer can set VUE_ENV
            var _isServer;
            var isServerRendering = function () {
                if (_isServer === undefined) {
                    /* istanbul ignore if */
                    if (!inBrowser && typeof global !== 'undefined') {
                        // detect presence of vue-server-renderer and avoid
                        // Webpack shimming the process
                        _isServer = global['process'].env.VUE_ENV === 'server';
                    } else {
                        _isServer = false;
                    }
                }
                return _isServer
            };

            // detect devtools
            var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;

            /* istanbul ignore next */
            function isNative(Ctor) {
                return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
            }

            var hasSymbol =
                typeof Symbol !== 'undefined' && isNative(Symbol) &&
                typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);

            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 = (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);

            if (false) {
                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();
                for (var i = 0, l = subs.length; i < l; i++) {
                    subs[i].update();
                }
            };

            // the current target watcher being evaluated.
            // this is globally unique because there could be only one
            // watcher being evaluated at any time.
            Dep.target = null;
            var targetStack = [];

            function pushTarget(_target) {
                if (Dep.target) {
                    targetStack.push(Dep.target);
                }
                Dep.target = _target;
            }

            function popTarget() {
                Dep.target = targetStack.pop();
            }

            /*  */

            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, deep) {
                var componentOptions = vnode.componentOptions;
                var cloned = new VNode(
                    vnode.tag,
                    vnode.data,
                    vnode.children,
                    vnode.text,
                    vnode.elm,
                    vnode.context,
                    componentOptions,
                    vnode.asyncFactory
                );
                cloned.ns = vnode.ns;
                cloned.isStatic = vnode.isStatic;
                cloned.key = vnode.key;
                cloned.isComment = vnode.isComment;
                cloned.fnContext = vnode.fnContext;
                cloned.fnOptions = vnode.fnOptions;
                cloned.fnScopeId = vnode.fnScopeId;
                cloned.isCloned = true;
                if (deep) {
                    if (vnode.children) {
                        cloned.children = cloneVNodes(vnode.children, true);
                    }
                    if (componentOptions && componentOptions.children) {
                        componentOptions.children = cloneVNodes(componentOptions.children, true);
                    }
                }
                return cloned
            }

            function cloneVNodes(vnodes, deep) {
                var len = vnodes.length;
                var res = new Array(len);
                for (var i = 0; i < len; i++) {
                    res[i] = cloneVNode(vnodes[i], deep);
                }
                return res
            }

            /*
             * not type checking this file because flow doesn't play well with
             * dynamically accessing methods on Array prototype
             */

            var arrayProto = Array.prototype;
            var arrayMethods = Object.create(arrayProto);
            [
                'push',
                'pop',
                'shift',
                'unshift',
                'splice',
                'sort',
                'reverse'
            ]
            .forEach(function (method) {
                // cache original method
                var original = arrayProto[method];
                def(arrayMethods, method, function mutator() {
                    var 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);

            /**
             * By default, when a reactive property is set, the new value is
             * also converted to become reactive. However when passing down props,
             * we don't want to force conversion because the value may be a nested value
             * under a frozen data structure. Converting it would defeat the optimization.
             */
            var observerState = {
                shouldConvert: true
            };

            /**
             * Observer class that are attached to each observed
             * object. Once attached, the observer converts target
             * object's property keys into getter/setters that
             * collect dependencies and dispatches updates.
             */
            var Observer = function Observer(value) {
                this.value = value;
                this.dep = new Dep();
                this.vmCount = 0;
                def(value, '__ob__', this);
                if (Array.isArray(value)) {
                    var augment = hasProto ?
                        protoAugment :
                        copyAugment;
                    augment(value, arrayMethods, arrayKeys);
                    this.observeArray(value);
                } else {
                    this.walk(value);
                }
            };

            /**
             * Walk through each property and convert them into
             * getter/setters. This method should only be called when
             * value type is Object.
             */
            Observer.prototype.walk = function walk(obj) {
                var keys = Object.keys(obj);
                for (var i = 0; i < keys.length; i++) {
                    defineReactive(obj, keys[i], obj[keys[i]]);
                }
            };

            /**
             * Observe a list of Array items.
             */
            Observer.prototype.observeArray = function observeArray(items) {
                for (var i = 0, l = items.length; i < l; i++) {
                    observe(items[i]);
                }
            };

            // helpers

            /**
             * Augment an target Object or Array by intercepting
             * the prototype chain using __proto__
             */
            function protoAugment(target, src, keys) {
                /* eslint-disable no-proto */
                target.__proto__ = src;
                /* eslint-enable no-proto */
            }

            /**
             * Augment an target Object or Array by defining
             * hidden properties.
             */
            /* istanbul ignore next */
            function copyAugment(target, src, keys) {
                for (var i = 0, l = keys.length; i < l; i++) {
                    var key = keys[i];
                    def(target, key, src[key]);
                }
            }

            /**
             * Attempt to create an observer instance for a value,
             * returns the new observer if successfully observed,
             * or the existing observer if the value already has one.
             */
            function observe(value, asRootData) {
                if (!isObject(value) || value instanceof VNode) {
                    return
                }
                var ob;
                if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
                    ob = value.__ob__;
                } else if (
                    observerState.shouldConvert &&
                    !isServerRendering() &&
                    (Array.isArray(value) || isPlainObject(value)) &&
                    Object.isExtensible(value) &&
                    !value._isVue
                ) {
                    ob = new Observer(value);
                }
                if (asRootData && ob) {
                    ob.vmCount++;
                }
                return ob
            }

            /**
             * Define a reactive property on an Object.
             */
            function defineReactive(
                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;

                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 (false) {
                            customSetter();
                        }
                        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 (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)) {
                    "production" !== 'production' && warn(
                        'Avoid adding reactive properties to a Vue instance or its root $data ' +
                        'at runtime - declare it upfront in the data option.'
                    );
                    return val
                }
                if (!ob) {
                    target[key] = val;
                    return val
                }
                defineReactive(ob.value, key, val);
                ob.dep.notify();
                return val
            }

            /**
             * Delete a property and trigger change if necessary.
             */
            function del(target, key) {
                if (Array.isArray(target) && isValidArrayIndex(key)) {
                    target.splice(key, 1);
                    return
                }
                var ob = (target).__ob__;
                if (target._isVue || (ob && ob.vmCount)) {
                    "production" !== 'production' && warn(
                        'Avoid deleting properties on a Vue instance or its root $data ' +
                        '- just set it to null.'
                    );
                    return
                }
                if (!hasOwn(target, key)) {
                    return
                }
                delete target[key];
                if (!ob) {
                    return
                }
                ob.dep.notify();
            }

            /**
             * Collect dependencies on array elements when the array is touched, since
             * we cannot intercept array element access like property getters.
             */
            function dependArray(value) {
                for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
                    e = value[i];
                    e && e.__ob__ && e.__ob__.dep.depend();
                    if (Array.isArray(e)) {
                        dependArray(e);
                    }
                }
            }

            /*  */

            /**
             * Option overwriting strategies are functions that handle
             * how to merge a parent option value and a child option
             * value into the final value.
             */
            var strats = config.optionMergeStrategies;

            /**
             * Options with restrictions
             */
            if (false) {
                strats.el = strats.propsData = function (parent, child, vm, key) {
                    if (!vm) {
                        warn(
                            "option \"" + key + "\" can only be used during instance " +
                            'creation with the `new` keyword.'
                        );
                    }
                    return defaultStrat(parent, child)
                };
            }

            /**
             * Helper that recursively merges two data objects together.
             */
            function mergeData(to, from) {
                if (!from) {
                    return to
                }
                var key, toVal, fromVal;
                var keys = Object.keys(from);
                for (var i = 0; i < keys.length; i++) {
                    key = keys[i];
                    toVal = to[key];
                    fromVal = from[key];
                    if (!hasOwn(to, key)) {
                        set(to, key, fromVal);
                    } else if (isPlainObject(toVal) && isPlainObject(fromVal)) {
                        mergeData(toVal, fromVal);
                    }
                }
                return to
            }

            /**
             * Data
             */
            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) : childVal,
                            typeof parentVal === 'function' ? parentVal.call(this) : parentVal
                        )
                    }
                } else {
                    return function mergedInstanceDataFn() {
                        // instance merge
                        var instanceData = typeof childVal === 'function' ?
                            childVal.call(vm) :
                            childVal;
                        var defaultData = typeof parentVal === 'function' ?
                            parentVal.call(vm) :
                            parentVal;
                        if (instanceData) {
                            return mergeData(instanceData, defaultData)
                        } else {
                            return defaultData
                        }
                    }
                }
            }

            strats.data = function (
                parentVal,
                childVal,
                vm
            ) {
                if (!vm) {
                    if (childVal && typeof childVal !== 'function') {
                        "production" !== 'production' && 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
            ) {
                return childVal ?
                    parentVal ?
                    parentVal.concat(childVal) :
                    Array.isArray(childVal) ?
                    childVal :
                    [childVal] :
                    parentVal
            }

            LIFECYCLE_HOOKS.forEach(function (hook) {
                strats[hook] = mergeHook;
            });

            /**
             * Assets
             *
             * When a vm is present (instance creation), we need to do
             * a three-way merge between constructor options, instance
             * options and parent options.
             */
            function mergeAssets(
                parentVal,
                childVal,
                vm,
                key
            ) {
                var res = Object.create(parentVal || null);
                if (childVal) {
                    "production" !== 'production' && 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)
                }
                if (false) {
                    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 && "production" !== '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) {
                    var lower = key.toLowerCase();
                    if (isBuiltInTag(lower) || config.isReservedTag(lower)) {
                        warn(
                            'Do not use built-in or reserved HTML elements as component ' +
                            'id: ' + key
                        );
                    }
                }
            }

            /**
             * Ensure all props option syntax are normalized into the
             * Object-based format.
             */
            function normalizeProps(options, 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 if (false) {
                            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 if (false) {
                    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;
                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 if (false) {
                    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 = dirs[key];
                        if (typeof def === 'function') {
                            dirs[key] = {
                                bind: def,
                                update: def
                            };
                        }
                    }
                }
            }

            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
            ) {
                if (false) {
                    checkComponents(child);
                }

                if (typeof child === 'function') {
                    child = child.options;
                }

                normalizeProps(child, vm);
                normalizeInject(child, vm);
                normalizeDirectives(child);
                var extendsFrom = child.extends;
                if (extendsFrom) {
                    parent = mergeOptions(parent, extendsFrom, vm);
                }
                if (child.mixins) {
                    for (var i = 0, l = child.mixins.length; i < l; i++) {
                        parent = mergeOptions(parent, child.mixins[i], vm);
                    }
                }
                var options = {};
                var key;
                for (key in parent) {
                    mergeField(key);
                }
                for (key in child) {
                    if (!hasOwn(parent, key)) {
                        mergeField(key);
                    }
                }

                function mergeField(key) {
                    var strat = strats[key] || defaultStrat;
                    options[key] = strat(parent[key], child[key], vm, key);
                }
                return options
            }

            /**
             * Resolve an asset.
             * This function is used because child instances need access
             * to assets defined in its ancestor chain.
             */
            function resolveAsset(
                options,
                type,
                id,
                warnMissing
            ) {
                /* istanbul ignore if */
                if (typeof id !== 'string') {
                    return
                }
                var assets = options[type];
                // check local registration variations first
                if (hasOwn(assets, id)) {
                    return assets[id]
                }
                var camelizedId = camelize(id);
                if (hasOwn(assets, camelizedId)) {
                    return assets[camelizedId]
                }
                var PascalCaseId = capitalize(camelizedId);
                if (hasOwn(assets, PascalCaseId)) {
                    return assets[PascalCaseId]
                }
                // fallback to prototype chain
                var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
                if (false) {
                    warn(
                        'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
                        options
                    );
                }
                return res
            }

            /*  */

            function validateProp(
                key,
                propOptions,
                propsData,
                vm
            ) {
                var prop = propOptions[key];
                var absent = !hasOwn(propsData, key);
                var value = propsData[key];
                // handle boolean props
                if (isType(Boolean, prop.type)) {
                    if (absent && !hasOwn(prop, 'default')) {
                        value = false;
                    } else if (!isType(String, prop.type) && (value === '' || value === hyphenate(key))) {
                        value = true;
                    }
                }
                // check default value
                if (value === undefined) {
                    value = getPropDefaultValue(vm, prop, key);
                    // since the default value is a fresh copy,
                    // make sure to observe it.
                    var prevShouldConvert = observerState.shouldConvert;
                    observerState.shouldConvert = true;
                    observe(value);
                    observerState.shouldConvert = prevShouldConvert;
                }
                if (false) {
                    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 (false) {
                    warn(
                        'Invalid default value for prop "' + key + '": ' +
                        'Props with type Object/Array must use a factory function ' +
                        'to return the default value.',
                        vm
                    );
                }
                // the raw prop value was also undefined from previous render,
                // return previous default value to avoid unnecessary watcher trigger
                if (vm && vm.$options.propsData &&
                    vm.$options.propsData[key] === undefined &&
                    vm._props[key] !== undefined
                ) {
                    return vm._props[key]
                }
                // call factory function for non-Function types
                // a value is Function if its prototype is function even across different execution context
                return typeof def === 'function' && getType(prop.type) !== 'Function' ?
                    def.call(vm) :
                    def
            }

            /**
             * Assert whether a prop is valid.
             */
            function assertProp(
                prop,
                name,
                value,
                vm,
                absent
            ) {
                if (prop.required && absent) {
                    warn(
                        'Missing required prop: "' + name + '"',
                        vm
                    );
                    return
                }
                if (value == null && !prop.required) {
                    return
                }
                var type = prop.type;
                var valid = !type || type === true;
                var expectedTypes = [];
                if (type) {
                    if (!Array.isArray(type)) {
                        type = [type];
                    }
                    for (var i = 0; i < type.length && !valid; i++) {
                        var assertedType = assertType(value, type[i]);
                        expectedTypes.push(assertedType.expectedType || '');
                        valid = assertedType.valid;
                    }
                }
                if (!valid) {
                    warn(
                        "Invalid prop: type check failed for prop \"" + name + "\"." +
                        " Expected " + (expectedTypes.map(capitalize).join(', ')) +
                        ", got " + (toRawType(value)) + ".",
                        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 isType(type, fn) {
                if (!Array.isArray(fn)) {
                    return getType(fn) === getType(type)
                }
                for (var i = 0, len = fn.length; i < len; i++) {
                    if (getType(fn[i]) === getType(type)) {
                        return true
                    }
                }
                /* istanbul ignore next */
                return false
            }

            /*  */

            function handleError(err, vm, info) {
                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);
            }

            function globalHandleError(err, vm, info) {
                if (config.errorHandler) {
                    try {
                        return config.errorHandler.call(null, err, vm, info)
                    } catch (e) {
                        logError(e, null, 'config.errorHandler');
                    }
                }
                logError(err, vm, info);
            }

            function logError(err, vm, info) {
                if (false) {
                    warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
                }
                /* istanbul ignore else */
                if ((inBrowser || inWeex) && typeof console !== 'undefined') {
                    console.error(err);
                } else {
                    throw err
                }
            }

            /*  */
            /* globals MessageChannel */

            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 both micro and macro tasks.
            // In < 2.4 we used micro tasks everywhere, but there are some scenarios where
            // micro tasks have too high a priority and fires in between supposedly
            // sequential events (e.g. #4521, #6690) or even between bubbling of the same
            // event (#6566). However, using macro tasks everywhere also has subtle problems
            // when state is changed right before repaint (e.g. #6813, out-in transitions).
            // Here we use micro task by default, but expose a way to force macro task when
            // needed (e.g. in event handlers attached by v-on).
            var microTimerFunc;
            var macroTimerFunc;
            var useMacroTask = false;

            // Determine (macro) Task defer implementation.
            // Technically setImmediate should be the ideal choice, but it's only available
            // in IE. The only polyfill that consistently queues the callback after all DOM
            // events triggered in the same loop is by using MessageChannel.
            /* istanbul ignore if */
            if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
                macroTimerFunc = function () {
                    setImmediate(flushCallbacks);
                };
            } else if (typeof MessageChannel !== 'undefined' && (
                    isNative(MessageChannel) ||
                    // PhantomJS
                    MessageChannel.toString() === '[object MessageChannelConstructor]'
                )) {
                var channel = new MessageChannel();
                var port = channel.port2;
                channel.port1.onmessage = flushCallbacks;
                macroTimerFunc = function () {
                    port.postMessage(1);
                };
            } else {
                /* istanbul ignore next */
                macroTimerFunc = function () {
                    setTimeout(flushCallbacks, 0);
                };
            }

            // Determine MicroTask defer implementation.
            /* istanbul ignore next, $flow-disable-line */
            if (typeof Promise !== 'undefined' && isNative(Promise)) {
                var p = Promise.resolve();
                microTimerFunc = 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);
                    }
                };
            } else {
                // fallback to macro
                microTimerFunc = macroTimerFunc;
            }

            /**
             * Wrap a function so that if any code inside triggers state change,
             * the changes are queued using a Task instead of a MicroTask.
             */
            function withMacroTask(fn) {
                return fn._withTask || (fn._withTask = function () {
                    useMacroTask = true;
                    var res = fn.apply(null, arguments);
                    useMacroTask = false;
                    return res
                })
            }

            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;
                    if (useMacroTask) {
                        macroTimerFunc();
                    } else {
                        microTimerFunc();
                    }
                }
                // $flow-disable-line
                if (!cb && typeof Promise !== 'undefined') {
                    return new Promise(function (resolve) {
                        _resolve = resolve;
                    })
                }
            }

            /*  */

            var mark;
            var measure;

            if (false) {
                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;

            if (false) {
                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: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
                        target
                    );
                };

                var hasProxy =
                    typeof Proxy !== 'undefined' &&
                    Proxy.toString().match(/native code/);

                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) || key.charAt(0) === '_';
                        if (!has && !isAllowed) {
                            warnNonPresent(target, key);
                        }
                        return has || !isAllowed
                    }
                };

                var getHandler = {
                    get: function get(target, key) {
                        if (typeof key === 'string' && !(key in target)) {
                            warnNonPresent(target, key);
                        }
                        return target[key]
                    }
                };

                initProxy = function initProxy(vm) {
                    if (hasProxy) {
                        // determine which proxy handler to use
                        var options = vm.$options;
                        var handlers = options.render && options.render._withStripped ?
                            getHandler :
                            hasHandler;
                        vm._renderProxy = new Proxy(vm, handlers);
                    } else {
                        vm._renderProxy = vm;
                    }
                };
            }

            /*  */

            var 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)) {
                    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) {
                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++) {
                            cloned[i].apply(null, arguments$1);
                        }
                    } else {
                        // return handler return value for single handlers
                        return fns.apply(null, arguments)
                    }
                }
                invoker.fns = fns;
                return invoker
            }

            function updateListeners(
                on,
                oldOn,
                add,
                remove$$1,
                vm
            ) {
                var name, cur, old, event;
                for (name in on) {
                    cur = on[name];
                    old = oldOn[name];
                    event = normalizeEvent(name);
                    if (isUndef(cur)) {
                        "production" !== 'production' && warn(
                            "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
                            vm
                        );
                    } else if (isUndef(old)) {
                        if (isUndef(cur.fns)) {
                            cur = on[name] = createFnInvoker(cur);
                        }
                        add(event.name, cur, event.once, event.capture, event.passive);
                    } else if (cur !== old) {
                        old.fns = cur;
                        on[name] = old;
                    }
                }
                for (name in oldOn) {
                    if (isUndef(on[name])) {
                        event = normalizeEvent(name);
                        remove$$1(event.name, oldOn[name], event.capture);
                    }
                }
            }

            /*  */

            function mergeVNodeHook(def, hookKey, hook) {
                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);
                        if (false) {
                            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 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,
                context
            ) {
                if (isTrue(factory.error) && isDef(factory.errorComp)) {
                    return factory.errorComp
                }

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

                if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
                    return factory.loadingComp
                }

                if (isDef(factory.contexts)) {
                    // already pending
                    factory.contexts.push(context);
                } else {
                    var contexts = factory.contexts = [context];
                    var sync = true;

                    var forceRender = function () {
                        for (var i = 0, l = contexts.length; i < l; i++) {
                            contexts[i].$forceUpdate();
                        }
                    };

                    var resolve = once(function (res) {
                        // cache resolved
                        factory.resolved = ensureCtor(res, baseCtor);
                        // invoke callbacks only if this is not a synchronous resolve
                        // (async resolves are shimmed as synchronous during SSR)
                        if (!sync) {
                            forceRender();
                        }
                    });

                    var reject = once(function (reason) {
                        "production" !== 'production' && warn(
                            "Failed to resolve async component: " + (String(factory)) +
                            (reason ? ("\nReason: " + reason) : '')
                        );
                        if (isDef(factory.errorComp)) {
                            factory.error = true;
                            forceRender();
                        }
                    });

                    var res = factory(resolve, reject);

                    if (isObject(res)) {
                        if (typeof res.then === 'function') {
                            // () => Promise
                            if (isUndef(factory.resolved)) {
                                res.then(resolve, reject);
                            }
                        } else if (isDef(res.component) && typeof res.component.then === 'function') {
                            res.component.then(resolve, reject);

                            if (isDef(res.error)) {
                                factory.errorComp = ensureCtor(res.error, baseCtor);
                            }

                            if (isDef(res.loading)) {
                                factory.loadingComp = ensureCtor(res.loading, baseCtor);
                                if (res.delay === 0) {
                                    factory.loading = true;
                                } else {
                                    setTimeout(function () {
                                        if (isUndef(factory.resolved) && isUndef(factory.error)) {
                                            factory.loading = true;
                                            forceRender();
                                        }
                                    }, res.delay || 200);
                                }
                            }

                            if (isDef(res.timeout)) {
                                setTimeout(function () {
                                    if (isUndef(factory.resolved)) {
                                        reject(
                                            false ?
                                            ("timeout (" + (res.timeout) + "ms)") :
                                            null
                                        );
                                    }
                                }, 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, once) {
                if (once) {
                    target.$once(event, fn);
                } else {
                    target.$on(event, fn);
                }
            }

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

            function updateComponentListeners(
                vm,
                listeners,
                oldListeners
            ) {
                target = vm;
                updateListeners(listeners, oldListeners || {}, add, remove$1, vm);
                target = undefined;
            }

            function eventsMixin(Vue) {
                var hookRE = /^hook:/;
                Vue.prototype.$on = function (event, fn) {
                    var this$1 = this;

                    var vm = this;
                    if (Array.isArray(event)) {
                        for (var i = 0, l = event.length; i < l; i++) {
                            this$1.$on(event[i], fn);
                        }
                    } else {
                        (vm._events[event] || (vm._events[event] = [])).push(fn);
                        // optimize hook:event cost by using a boolean flag marked at registration
                        // instead of a hash lookup
                        if (hookRE.test(event)) {
                            vm._hasHookEvent = true;
                        }
                    }
                    return vm
                };

                Vue.prototype.$once = function (event, fn) {
                    var vm = this;

                    function on() {
                        vm.$off(event, on);
                        fn.apply(vm, arguments);
                    }
                    on.fn = fn;
                    vm.$on(event, on);
                    return vm
                };

                Vue.prototype.$off = function (event, fn) {
                    var this$1 = this;

                    var vm = this;
                    // all
                    if (!arguments.length) {
                        vm._events = Object.create(null);
                        return vm
                    }
                    // array of events
                    if (Array.isArray(event)) {
                        for (var i = 0, l = event.length; i < l; i++) {
                            this$1.$off(event[i], fn);
                        }
                        return vm
                    }
                    // specific event
                    var cbs = vm._events[event];
                    if (!cbs) {
                        return vm
                    }
                    if (!fn) {
                        vm._events[event] = null;
                        return vm
                    }
                    if (fn) {
                        // specific handler
                        var cb;
                        var i$1 = cbs.length;
                        while (i$1--) {
                            cb = cbs[i$1];
                            if (cb === fn || cb.fn === fn) {
                                cbs.splice(i$1, 1);
                                break
                            }
                        }
                    }
                    return vm
                };

                Vue.prototype.$emit = function (event) {
                    var vm = this;
                    if (false) {
                        var lowerCaseEvent = event.toLowerCase();
                        if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
                            tip(
                                "Event \"" + lowerCaseEvent + "\" is emitted in component " +
                                (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
                                "Note that HTML attributes are case-insensitive and you cannot use " +
                                "v-on to listen to camelCase events when using in-DOM templates. " +
                                "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
                            );
                        }
                    }
                    var cbs = vm._events[event];
                    if (cbs) {
                        cbs = cbs.length > 1 ? toArray(cbs) : cbs;
                        var args = toArray(arguments, 1);
                        for (var i = 0, l = cbs.length; i < l; i++) {
                            try {
                                cbs[i].apply(vm, args);
                            } catch (e) {
                                handleError(e, vm, ("event handler for \"" + event + "\""));
                            }
                        }
                    }
                    return vm
                };
            }

            /*  */

            /**
             * Runtime helper for resolving raw children VNodes into a slot object.
             */
            function resolveSlots(
                children,
                context
            ) {
                var slots = {};
                if (!children) {
                    return 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 = child.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 resolveScopedSlots(
                fns, // see flow/vnode
                res
            ) {
                res = res || {};
                for (var i = 0; i < fns.length; i++) {
                    if (Array.isArray(fns[i])) {
                        resolveScopedSlots(fns[i], res);
                    } else {
                        res[fns[i].key] = fns[i].fn;
                    }
                }
                return res
            }

            /*  */

            var activeInstance = null;
            var isUpdatingChildComponent = false;

            function initLifecycle(vm) {
                var options = vm.$options;

                // locate first non-abstract parent
                var parent = options.parent;
                if (parent && !options.abstract) {
                    while (parent.$options.abstract && parent.$parent) {
                        parent = parent.$parent;
                    }
                    parent.$children.push(vm);
                }

                vm.$parent = parent;
                vm.$root = parent ? parent.$root : vm;

                vm.$children = [];
                vm.$refs = {};

                vm._watcher = null;
                vm._inactive = null;
                vm._directInactive = false;
                vm._isMounted = false;
                vm._isDestroyed = false;
                vm._isBeingDestroyed = false;
            }

            function lifecycleMixin(Vue) {
                Vue.prototype._update = function (vnode, hydrating) {
                    var vm = this;
                    if (vm._isMounted) {
                        callHook(vm, 'beforeUpdate');
                    }
                    var prevEl = vm.$el;
                    var prevVnode = vm._vnode;
                    var prevActiveInstance = activeInstance;
                    activeInstance = vm;
                    vm._vnode = vnode;
                    // Vue.prototype.__patch__ is injected in entry points
                    // based on the rendering backend used.
                    if (!prevVnode) {
                        // initial render
                        vm.$el = vm.__patch__(
                            vm.$el, vnode, hydrating, false /* removeOnly */ ,
                            vm.$options._parentElm,
                            vm.$options._refElm
                        );
                        // no need for the ref nodes after initial patch
                        // this prevents keeping a detached DOM tree in memory (#5851)
                        vm.$options._parentElm = vm.$options._refElm = null;
                    } else {
                        // updates
                        vm.$el = vm.__patch__(prevVnode, vnode);
                    }
                    activeInstance = prevActiveInstance;
                    // update __vue__ reference
                    if (prevEl) {
                        prevEl.__vue__ = null;
                    }
                    if (vm.$el) {
                        vm.$el.__vue__ = vm;
                    }
                    // if parent is an HOC, update its $el as well
                    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
                        vm.$parent.$el = vm.$el;
                    }
                    // updated hook is called by the scheduler to ensure that children are
                    // updated in a parent's updated hook.
                };

                Vue.prototype.$forceUpdate = function () {
                    var vm = this;
                    if (vm._watcher) {
                        vm._watcher.update();
                    }
                };

                Vue.prototype.$destroy = function () {
                    var vm = this;
                    if (vm._isBeingDestroyed) {
                        return
                    }
                    callHook(vm, 'beforeDestroy');
                    vm._isBeingDestroyed = true;
                    // remove self from parent
                    var parent = vm.$parent;
                    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
                        remove(parent.$children, vm);
                    }
                    // teardown watchers
                    if (vm._watcher) {
                        vm._watcher.teardown();
                    }
                    var i = vm._watchers.length;
                    while (i--) {
                        vm._watchers[i].teardown();
                    }
                    // remove reference from data ob
                    // frozen object may not have observer.
                    if (vm._data.__ob__) {
                        vm._data.__ob__.vmCount--;
                    }
                    // call the last hook...
                    vm._isDestroyed = true;
                    // invoke destroy hooks on current rendered tree
                    vm.__patch__(vm._vnode, null);
                    // fire destroyed hook
                    callHook(vm, 'destroyed');
                    // turn off all instance listeners.
                    vm.$off();
                    // remove __vue__ reference
                    if (vm.$el) {
                        vm.$el.__vue__ = null;
                    }
                    // release circular reference (#6759)
                    if (vm.$vnode) {
                        vm.$vnode.parent = null;
                    }
                };
            }

            function mountComponent(
                vm,
                el,
                hydrating
            ) {
                vm.$el = el;
                if (!vm.$options.render) {
                    vm.$options.render = createEmptyVNode;
                    if (false) {
                        /* istanbul ignore if */
                        if ((vm.$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 (false) {
                    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, null, 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
            ) {
                if (false) {
                    isUpdatingChildComponent = true;
                }

                // determine whether component has slot children
                // we need to do this before overwriting $options._renderChildren
                var hasChildren = !!(
                    renderChildren || // has new static slots
                    vm.$options._renderChildren || // has old static slots
                    parentVnode.data.scopedSlots || // has new scoped slots
                    vm.$scopedSlots !== emptyObject // has old scoped slots
                );

                vm.$options._parentVnode = parentVnode;
                vm.$vnode = parentVnode; // update vm's placeholder node without re-render

                if (vm._vnode) { // update child tree's parent
                    vm._vnode.parent = parentVnode;
                }
                vm.$options._renderChildren = renderChildren;

                // update $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 && parentVnode.data.attrs) || emptyObject;
                vm.$listeners = listeners || emptyObject;

                // update props
                if (propsData && vm.$options.props) {
                    observerState.shouldConvert = false;
                    var props = vm._props;
                    var propKeys = vm.$options._propKeys || [];
                    for (var i = 0; i < propKeys.length; i++) {
                        var key = propKeys[i];
                        props[key] = validateProp(key, vm.$options.props, propsData, vm);
                    }
                    observerState.shouldConvert = true;
                    // keep a copy of raw propsData
                    vm.$options.propsData = propsData;
                }

                // update listeners
                if (listeners) {
                    var oldListeners = vm.$options._parentListeners;
                    vm.$options._parentListeners = listeners;
                    updateComponentListeners(vm, listeners, oldListeners);
                }
                // resolve slots + force update if has children
                if (hasChildren) {
                    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
                    vm.$forceUpdate();
                }

                if (false) {
                    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) {
                var handlers = vm.$options[hook];
                if (handlers) {
                    for (var i = 0, j = handlers.length; i < j; i++) {
                        try {
                            handlers[i].call(vm);
                        } catch (e) {
                            handleError(e, vm, (hook + " hook"));
                        }
                    }
                }
                if (vm._hasHookEvent) {
                    vm.$emit('hook:' + hook);
                }
            }

            /*  */


            var MAX_UPDATE_COUNT = 100;

            var queue = [];
            var activatedChildren = [];
            var has = {};
            var circular = {};
            var waiting = false;
            var flushing = false;
            var index = 0;

            /**
             * Reset the scheduler's state.
             */
            function resetSchedulerState() {
                index = queue.length = activatedChildren.length = 0;
                has = {};
                if (false) {
                    circular = {};
                }
                waiting = flushing = false;
            }

            /**
             * Flush both queues and run the watchers.
             */
            function flushSchedulerQueue() {
                flushing = true;
                var watcher, id;

                // Sort queue before flush.
                // This ensures that:
                // 1. Components are updated from parent to child. (because parent is always
                //    created before the child)
                // 2. A component's user watchers are run before its render watcher (because
                //    user watchers are created before the render watcher)
                // 3. If a component is destroyed during a parent component's watcher run,
                //    its watchers can be skipped.
                queue.sort(function (a, b) {
                    return a.id - b.id;
                });

                // do not cache length because more watchers might be pushed
                // as we run existing watchers
                for (index = 0; index < queue.length; index++) {
                    watcher = queue[index];
                    id = watcher.id;
                    has[id] = null;
                    watcher.run();
                    // in dev build, check and stop circular updates.
                    if (false) {
                        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) {
                        callHook(vm, 'updated');
                    }
                }
            }

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

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

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

            /*  */

            var uid$2 = 0;

            /**
             * A watcher parses an expression, collects dependencies,
             * and fires callback when the expression value changes.
             * This is used for both the $watch() api and directives.
             */
            var Watcher = function Watcher(
                vm,
                expOrFn,
                cb,
                options,
                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;
                } 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 = false ?
                    expOrFn.toString() :
                    '';
                // parse expression for getter
                if (typeof expOrFn === 'function') {
                    this.getter = expOrFn;
                } else {
                    this.getter = parsePath(expOrFn);
                    if (!this.getter) {
                        this.getter = function () {};
                        "production" !== 'production' && warn(
                            "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 this$1 = this;

                var i = this.deps.length;
                while (i--) {
                    var dep = this$1.deps[i];
                    if (!this$1.newDepIds.has(dep.id)) {
                        dep.removeSub(this$1);
                    }
                }
                var tmp = this.depIds;
                this.depIds = this.newDepIds;
                this.newDepIds = tmp;
                this.newDepIds.clear();
                tmp = this.deps;
                this.deps = this.newDeps;
                this.newDeps = tmp;
                this.newDeps.length = 0;
            };

            /**
             * Subscriber interface.
             * Will be called when a dependency changes.
             */
            Watcher.prototype.update = function update() {
                /* istanbul ignore else */
                if (this.lazy) {
                    this.dirty = true;
                } else if (this.sync) {
                    this.run();
                } else {
                    queueWatcher(this);
                }
            };

            /**
             * Scheduler job interface.
             * Will be called by the scheduler.
             */
            Watcher.prototype.run = function run() {
                if (this.active) {
                    var value = this.get();
                    if (
                        value !== this.value ||
                        // Deep watchers and watchers on Object/Arrays should fire even
                        // when the value is the same, because the value may
                        // have mutated.
                        isObject(value) ||
                        this.deep
                    ) {
                        // set new value
                        var oldValue = this.value;
                        this.value = value;
                        if (this.user) {
                            try {
                                this.cb.call(this.vm, value, oldValue);
                            } catch (e) {
                                handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
                            }
                        } else {
                            this.cb.call(this.vm, value, oldValue);
                        }
                    }
                }
            };

            /**
             * Evaluate the value of the watcher.
             * This only gets called for lazy watchers.
             */
            Watcher.prototype.evaluate = function evaluate() {
                this.value = this.get();
                this.dirty = false;
            };

            /**
             * Depend on all deps collected by this watcher.
             */
            Watcher.prototype.depend = function depend() {
                var this$1 = this;

                var i = this.deps.length;
                while (i--) {
                    this$1.deps[i].depend();
                }
            };

            /**
             * Remove self from all dependencies' subscriber list.
             */
            Watcher.prototype.teardown = function teardown() {
                var this$1 = this;

                if (this.active) {
                    // remove self from vm's watcher list
                    // this is a somewhat expensive operation so we skip it
                    // if the vm is being destroyed.
                    if (!this.vm._isBeingDestroyed) {
                        remove(this.vm._watchers, this);
                    }
                    var i = this.deps.length;
                    while (i--) {
                        this$1.deps[i].removeSub(this$1);
                    }
                    this.active = false;
                }
            };

            /*  */

            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.$parent;
                // root instance props should be converted
                observerState.shouldConvert = isRoot;
                var loop = function (key) {
                    keys.push(key);
                    var value = validateProp(key, propsOptions, propsData, vm);
                    /* istanbul ignore else */
                    if (false) {
                        var hyphenatedKey = hyphenate(key);
                        if (isReservedAttribute(hyphenatedKey) ||
                            config.isReservedAttr(hyphenatedKey)) {
                            warn(
                                ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
                                vm
                            );
                        }
                        defineReactive(props, key, value, function () {
                            if (vm.$parent && !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
                                );
                            }
                        });
                    } else {
                        defineReactive(props, key, value);
                    }
                    // static props are already proxied on the component's prototype
                    // during Vue.extend(). We only need to proxy props defined at
                    // instantiation here.
                    if (!(key in vm)) {
                        proxy(vm, "_props", key);
                    }
                };

                for (var key in propsOptions) loop(key);
                observerState.shouldConvert = true;
            }

            function initData(vm) {
                var data = vm.$options.data;
                data = vm._data = typeof data === 'function' ?
                    getData(data, vm) :
                    data || {};
                if (!isPlainObject(data)) {
                    data = {};
                    "production" !== 'production' && warn(
                        'data functions should return an object:\n' +
                        'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
                        vm
                    );
                }
                // proxy data on instance
                var keys = Object.keys(data);
                var props = vm.$options.props;
                var methods = vm.$options.methods;
                var i = keys.length;
                while (i--) {
                    var key = keys[i];
                    if (false) {
                        if (methods && hasOwn(methods, key)) {
                            warn(
                                ("Method \"" + key + "\" has already been defined as a data property."),
                                vm
                            );
                        }
                    }
                    if (props && hasOwn(props, key)) {
                        "production" !== 'production' && 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) {
                try {
                    return data.call(vm, vm)
                } catch (e) {
                    handleError(e, vm, "data()");
                    return {}
                }
            }

            var computedWatcherOptions = {
                lazy: true
            };

            function initComputed(vm, computed) {
                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 (false) {
                        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 (false) {
                        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) :
                        userDef;
                    sharedPropertyDefinition.set = noop;
                } else {
                    sharedPropertyDefinition.get = userDef.get ?
                        shouldCache && userDef.cache !== false ?
                        createComputedGetter(key) :
                        userDef.get :
                        noop;
                    sharedPropertyDefinition.set = userDef.set ?
                        userDef.set :
                        noop;
                }
                if (false) {
                    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 initMethods(vm, methods) {
                var props = vm.$options.props;
                for (var key in methods) {
                    if (false) {
                        if (methods[key] == null) {
                            warn(
                                "Method \"" + key + "\" has an undefined value in the component definition. " +
                                "Did you reference the function correctly?",
                                vm
                            );
                        }
                        if (props && hasOwn(props, key)) {
                            warn(
                                ("Method \"" + key + "\" has already been defined as a prop."),
                                vm
                            );
                        }
                        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] = methods[key] == null ? 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,
                keyOrFn,
                handler,
                options
            ) {
                if (isPlainObject(handler)) {
                    options = handler;
                    handler = handler.handler;
                }
                if (typeof handler === 'string') {
                    handler = vm[handler];
                }
                return vm.$watch(keyOrFn, handler, options)
            }

            function stateMixin(Vue) {
                // flow somehow has problems with directly declared definition object
                // when using Object.defineProperty, so we have to procedurally build up
                // the object here.
                var dataDef = {};
                dataDef.get = function () {
                    return this._data
                };
                var propsDef = {};
                propsDef.get = function () {
                    return this._props
                };
                if (false) {
                    dataDef.set = function (newData) {
                        warn(
                            'Avoid replacing instance root $data. ' +
                            'Use nested data properties instead.',
                            this
                        );
                    };
                    propsDef.set = function () {
                        warn("$props is readonly.", this);
                    };
                }
                Object.defineProperty(Vue.prototype, '$data', dataDef);
                Object.defineProperty(Vue.prototype, '$props', propsDef);

                Vue.prototype.$set = set;
                Vue.prototype.$delete = del;

                Vue.prototype.$watch = function (
                    expOrFn,
                    cb,
                    options
                ) {
                    var vm = this;
                    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) {
                        cb.call(vm, watcher.value);
                    }
                    return function unwatchFn() {
                        watcher.teardown();
                    }
                };
            }

            /*  */

            function initProvide(vm) {
                var provide = vm.$options.provide;
                if (provide) {
                    vm._provided = typeof provide === 'function' ?
                        provide.call(vm) :
                        provide;
                }
            }

            function initInjections(vm) {
                var result = resolveInject(vm.$options.inject, vm);
                if (result) {
                    observerState.shouldConvert = false;
                    Object.keys(result).forEach(function (key) {
                        /* istanbul ignore else */
                        if (false) {
                            defineReactive(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
                                );
                            });
                        } else {
                            defineReactive(vm, key, result[key]);
                        }
                    });
                    observerState.shouldConvert = 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).filter(function (key) {
                            /* istanbul ignore next */
                            return Object.getOwnPropertyDescriptor(inject, key).enumerable
                        }) :
                        Object.keys(inject);

                    for (var i = 0; i < keys.length; i++) {
                        var key = keys[i];
                        var provideKey = inject[key].from;
                        var source = vm;
                        while (source) {
                            if (source._provided && provideKey in source._provided) {
                                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 if (false) {
                                warn(("Injection \"" + key + "\" not found"), vm);
                            }
                        }
                    }
                    return result
                }
            }

            /*  */

            /**
             * Runtime helper for rendering v-for lists.
             */
            function renderList(
                val,
                render
            ) {
                var ret, i, l, keys, key;
                if (Array.isArray(val) || typeof val === 'string') {
                    ret = new Array(val.length);
                    for (i = 0, l = val.length; i < l; i++) {
                        ret[i] = render(val[i], i);
                    }
                } else if (typeof val === 'number') {
                    ret = new Array(val);
                    for (i = 0; i < val; i++) {
                        ret[i] = render(i + 1, i);
                    }
                } else if (isObject(val)) {
                    keys = Object.keys(val);
                    ret = new Array(keys.length);
                    for (i = 0, l = keys.length; i < l; i++) {
                        key = keys[i];
                        ret[i] = render(val[key], key, i);
                    }
                }
                if (isDef(ret)) {
                    (ret)._isVList = true;
                }
                return ret
            }

            /*  */

            /**
             * Runtime helper for rendering <slot>
             */
            function renderSlot(
                name,
                fallback,
                props,
                bindObject
            ) {
                var scopedSlotFn = this.$scopedSlots[name];
                var nodes;
                if (scopedSlotFn) { // scoped slot
                    props = props || {};
                    if (bindObject) {
                        if (false) {
                            warn(
                                'slot v-bind without argument expects an Object',
                                this
                            );
                        }
                        props = extend(extend({}, bindObject), props);
                    }
                    nodes = scopedSlotFn(props) || fallback;
                } else {
                    var slotNodes = this.$slots[name];
                    // warn duplicate slot usage
                    if (slotNodes) {
                        if (false) {
                            warn(
                                "Duplicate presence of slot \"" + name + "\" found in the same render tree " +
                                "- this will likely cause render errors.",
                                this
                            );
                        }
                        slotNodes._rendered = true;
                    }
                    nodes = slotNodes || 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
            }

            /*  */

            /**
             * 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,
                builtInAlias,
                eventKeyName
            ) {
                var keyCodes = config.keyCodes[key] || builtInAlias;
                if (keyCodes) {
                    if (Array.isArray(keyCodes)) {
                        return keyCodes.indexOf(eventKeyCode) === -1
                    } else {
                        return keyCodes !== 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)) {
                        "production" !== 'production' && 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 = {});
                            }
                            if (!(key 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,
                isOnce
            ) {
                // render fns generated by compiler < 2.5.4 does not provide v-once
                // information to runtime so be conservative
                var isOldVersion = arguments.length < 3;
                // if a static tree is generated by v-once, it is cached on the instance;
                // otherwise it is purely static and can be cached on the shared options
                // across all instances.
                var renderFns = this.$options.staticRenderFns;
                var cached = isOldVersion || isOnce ?
                    (this._staticTrees || (this._staticTrees = [])) :
                    (renderFns.cached || (renderFns.cached = []));
                var tree = cached[index];
                // if has already-rendered static tree and not inside v-for,
                // we can reuse the same tree by doing a shallow clone.
                if (tree && !isInFor) {
                    return Array.isArray(tree) ?
                        cloneVNodes(tree) :
                        cloneVNode(tree)
                }
                // otherwise, render a fresh tree.
                tree = cached[index] = renderFns[index].call(this._renderProxy, null, this);
                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)) {
                        "production" !== 'production' && 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 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;
            }

            /*  */

            function FunctionalRenderContext(
                data,
                props,
                children,
                parent,
                Ctor
            ) {
                var options = Ctor.options;
                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 () {
                    return resolveSlots(children, parent);
                };

                // ensure the createElement function in functional components
                // gets a unique context - this is necessary for correct named slot check
                var contextVm = Object.create(parent);
                var isCompiled = isTrue(options._compiled);
                var needNormalization = !isCompiled;

                // support for compiled functional template
                if (isCompiled) {
                    // exposing $options for renderStatic()
                    this.$options = options;
                    // pre-resolve slots for renderSlot()
                    this.$slots = this.slots();
                    this.$scopedSlots = data.scopedSlots || emptyObject;
                }

                if (options._scopeId) {
                    this._c = function (a, b, c, d) {
                        var vnode = createElement(contextVm, a, b, c, d, needNormalization);
                        if (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) {
                    vnode.fnContext = contextVm;
                    vnode.fnOptions = options;
                    if (data.slot) {
                        (vnode.data || (vnode.data = {})).slot = data.slot;
                    }
                }

                return vnode
            }

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

            /*  */

            // hooks to be invoked on component VNodes during patch
            var componentVNodeHooks = {
                init: function init(
                    vnode,
                    hydrating,
                    parentElm,
                    refElm
                ) {
                    if (!vnode.componentInstance || vnode.componentInstance._isDestroyed) {
                        var child = vnode.componentInstance = createComponentInstanceForVnode(
                            vnode,
                            activeInstance,
                            parentElm,
                            refElm
                        );
                        child.$mount(hydrating ? vnode.elm : undefined, hydrating);
                    } else if (vnode.data.keepAlive) {
                        // kept-alive components, treat as a patch
                        var mountedNode = vnode; // work around flow
                        componentVNodeHooks.prepatch(mountedNode, mountedNode);
                    }
                },

                prepatch: function prepatch(oldVnode, vnode) {
                    var options = vnode.componentOptions;
                    var child = vnode.componentInstance = oldVnode.componentInstance;
                    updateChildComponent(
                        child,
                        options.propsData, // updated props
                        options.listeners, // updated listeners
                        vnode, // new parent vnode
                        options.children // new children
                    );
                },

                insert: function insert(vnode) {
                    var context = vnode.context;
                    var componentInstance = vnode.componentInstance;
                    if (!componentInstance._isMounted) {
                        componentInstance._isMounted = true;
                        callHook(componentInstance, 'mounted');
                    }
                    if (vnode.data.keepAlive) {
                        if (context._isMounted) {
                            // vue-router#1212
                            // During updates, a kept-alive component's child components may
                            // change, so directly walking the tree here may call activated hooks
                            // on incorrect children. Instead we push them into a queue which will
                            // be processed after the whole patch process ended.
                            queueActivatedComponent(componentInstance);
                        } else {
                            activateChildComponent(componentInstance, true /* direct */ );
                        }
                    }
                },

                destroy: function destroy(vnode) {
                    var componentInstance = vnode.componentInstance;
                    if (!componentInstance._isDestroyed) {
                        if (!vnode.data.keepAlive) {
                            componentInstance.$destroy();
                        } else {
                            deactivateChildComponent(componentInstance, true /* direct */ );
                        }
                    }
                }
            };

            var hooksToMerge = Object.keys(componentVNodeHooks);

            function createComponent(
                Ctor,
                data,
                context,
                children,
                tag
            ) {
                if (isUndef(Ctor)) {
                    return
                }

                var baseCtor = context.$options._base;

                // plain options object: turn it into a constructor
                if (isObject(Ctor)) {
                    Ctor = baseCtor.extend(Ctor);
                }

                // if at this stage it's not a constructor or an async component factory,
                // reject.
                if (typeof Ctor !== 'function') {
                    if (false) {
                        warn(("Invalid Component definition: " + (String(Ctor))), context);
                    }
                    return
                }

                // async component
                var asyncFactory;
                if (isUndef(Ctor.cid)) {
                    asyncFactory = Ctor;
                    Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
                    if (Ctor === undefined) {
                        // return a placeholder node for async component, which is rendered
                        // as a comment node but preserves all the raw information for the node.
                        // the information will be used for async server-rendering and hydration.
                        return createAsyncPlaceholder(
                            asyncFactory,
                            data,
                            context,
                            children,
                            tag
                        )
                    }
                }

                data = data || {};

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

                // transform component v-model data into props & events
                if (isDef(data.model)) {
                    transformModel(Ctor.options, data);
                }

                // extract props
                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;
                    }
                }

                // merge component management hooks onto the placeholder node
                mergeHooks(data);

                // return a placeholder vnode
                var name = Ctor.options.name || tag;
                var vnode = new VNode(
                    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
                    data, undefined, undefined, undefined, context, {
                        Ctor: Ctor,
                        propsData: propsData,
                        listeners: listeners,
                        tag: tag,
                        children: children
                    },
                    asyncFactory
                );
                return vnode
            }

            function createComponentInstanceForVnode(
                vnode, // we know it's MountedComponentVNode but flow doesn't
                parent, // activeInstance in lifecycle state
                parentElm,
                refElm
            ) {
                var vnodeComponentOptions = vnode.componentOptions;
                var options = {
                    _isComponent: true,
                    parent: parent,
                    propsData: vnodeComponentOptions.propsData,
                    _componentTag: vnodeComponentOptions.tag,
                    _parentVnode: vnode,
                    _parentListeners: vnodeComponentOptions.listeners,
                    _renderChildren: vnodeComponentOptions.children,
                    _parentElm: parentElm || null,
                    _refElm: refElm || null
                };
                // check inline-template render functions
                var inlineTemplate = vnode.data.inlineTemplate;
                if (isDef(inlineTemplate)) {
                    options.render = inlineTemplate.render;
                    options.staticRenderFns = inlineTemplate.staticRenderFns;
                }
                return new vnodeComponentOptions.Ctor(options)
            }

            function mergeHooks(data) {
                if (!data.hook) {
                    data.hook = {};
                }
                for (var i = 0; i < hooksToMerge.length; i++) {
                    var key = hooksToMerge[i];
                    var fromParent = data.hook[key];
                    var ours = componentVNodeHooks[key];
                    data.hook[key] = fromParent ? mergeHook$1(ours, fromParent) : ours;
                }
            }

            function mergeHook$1(one, two) {
                return function (a, b, c, d) {
                    one(a, b, c, d);
                    two(a, b, c, d);
                }
            }

            // transform component v-model info (value and callback) into
            // prop and event handler respectively.
            function transformModel(options, data) {
                var prop = (options.model && options.model.prop) || 'value';
                var event = (options.model && options.model.event) || 'input';
                (data.props || (data.props = {}))[prop] = data.model.value;
                var on = data.on || (data.on = {});
                if (isDef(on[event])) {
                    on[event] = [data.model.callback].concat(on[event]);
                } else {
                    on[event] = data.model.callback;
                }
            }

            /*  */

            var SIMPLE_NORMALIZE = 1;
            var ALWAYS_NORMALIZE = 2;

            // wrapper function for providing a more flexible interface
            // without getting yelled at by flow
            function createElement(
                context,
                tag,
                data,
                children,
                normalizationType,
                alwaysNormalize
            ) {
                if (Array.isArray(data) || isPrimitive(data)) {
                    normalizationType = children;
                    children = data;
                    data = undefined;
                }
                if (isTrue(alwaysNormalize)) {
                    normalizationType = ALWAYS_NORMALIZE;
                }
                return _createElement(context, tag, data, children, normalizationType)
            }

            function _createElement(
                context,
                tag,
                data,
                children,
                normalizationType
            ) {
                if (isDef(data) && isDef((data).__ob__)) {
                    "production" !== 'production' && warn(
                        "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 (false) {
                    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 (isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
                        // component
                        vnode = createComponent(Ctor, data, context, children, tag);
                    } else {
                        // unknown or unlisted namespaced elements
                        // check at runtime because it may get assigned a namespace when its
                        // parent normalizes children
                        vnode = new VNode(
                            tag, data, children,
                            undefined, undefined, context
                        );
                    }
                } else {
                    // direct component options / constructor
                    vnode = createComponent(tag, data, context, children);
                }
                if (isDef(vnode)) {
                    if (ns) {
                        applyNS(vnode, ns);
                    }
                    return vnode
                } else {
                    return createEmptyVNode()
                }
            }

            function applyNS(vnode, ns, 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))) {
                            applyNS(child, ns, force);
                        }
                    }
                }
            }

            /*  */

            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 */
                if (false) {
                    defineReactive(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
                        !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
                    }, true);
                    defineReactive(vm, '$listeners', options._parentListeners || emptyObject, function () {
                        !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
                    }, true);
                } else {
                    defineReactive(vm, '$attrs', parentData && parentData.attrs || emptyObject, null, true);
                    defineReactive(vm, '$listeners', options._parentListeners || emptyObject, null, true);
                }
            }

            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 (vm._isMounted) {
                        // if the parent didn't update, the slot nodes will be the ones from
                        // last render. They need to be cloned to ensure "freshness" for this render.
                        for (var key in vm.$slots) {
                            var slot = vm.$slots[key];
                            // _rendered is a flag added by renderSlot, but may not be present
                            // if the slot is passed from manually written render functions
                            if (slot._rendered || (slot[0] && slot[0].elm)) {
                                vm.$slots[key] = cloneVNodes(slot, true /* deep */ );
                            }
                        }
                    }

                    vm.$scopedSlots = (_parentVnode && _parentVnode.data.scopedSlots) || emptyObject;

                    // set parent vnode. this allows render functions to have access
                    // to the data on the placeholder node.
                    vm.$vnode = _parentVnode;
                    // render self
                    var vnode;
                    try {
                        vnode = render.call(vm._renderProxy, vm.$createElement);
                    } catch (e) {
                        handleError(e, vm, "render");
                        // return error render result,
                        // or previous vnode to prevent render error causing blank component
                        /* istanbul ignore else */
                        if (false) {
                            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;
                            }
                        } else {
                            vnode = vm._vnode;
                        }
                    }
                    // return empty vnode in case the render function errored out
                    if (!(vnode instanceof VNode)) {
                        if (false) {
                            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
                };
            }

            /*  */

            var uid$1 = 0;

            function initMixin(Vue) {
                Vue.prototype._init = function (options) {
                    var vm = this;
                    // a uid
                    vm._uid = uid$1++;

                    var startTag, endTag;
                    /* istanbul ignore if */
                    if (false) {
                        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 */
                    if (false) {
                        initProxy(vm);
                    } else {
                        vm._renderProxy = vm;
                    }
                    // expose real self
                    vm._self = vm;
                    initLifecycle(vm);
                    initEvents(vm);
                    initRender(vm);
                    callHook(vm, 'beforeCreate');
                    initInjections(vm); // resolve injections before data/props
                    initState(vm);
                    initProvide(vm); // resolve provide after data/props
                    callHook(vm, 'created');

                    /* istanbul ignore if */
                    if (false) {
                        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.
                opts.parent = options.parent;
                opts.propsData = options.propsData;
                opts._parentVnode = options._parentVnode;
                opts._parentListeners = options._parentListeners;
                opts._renderChildren = options._renderChildren;
                opts._componentTag = options._componentTag;
                opts._parentElm = options._parentElm;
                opts._refElm = options._refElm;
                if (options.render) {
                    opts.render = options.render;
                    opts.staticRenderFns = options.staticRenderFns;
                }
            }

            function resolveConstructorOptions(Ctor) {
                var options = Ctor.options;
                if (Ctor.super) {
                    var superOptions = resolveConstructorOptions(Ctor.super);
                    var cachedSuperOptions = Ctor.superOptions;
                    if (superOptions !== cachedSuperOptions) {
                        // super option changed,
                        // need to resolve new options.
                        Ctor.superOptions = superOptions;
                        // check if there are any late-modified/attached options (#4976)
                        var modifiedOptions = resolveModifiedOptions(Ctor);
                        // update base extend options
                        if (modifiedOptions) {
                            extend(Ctor.extendOptions, modifiedOptions);
                        }
                        options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
                        if (options.name) {
                            options.components[options.name] = Ctor;
                        }
                    }
                }
                return options
            }

            function resolveModifiedOptions(Ctor) {
                var modified;
                var latest = Ctor.options;
                var extended = Ctor.extendOptions;
                var sealed = Ctor.sealedOptions;
                for (var key in latest) {
                    if (latest[key] !== sealed[key]) {
                        if (!modified) {
                            modified = {};
                        }
                        modified[key] = dedupe(latest[key], extended[key], sealed[key]);
                    }
                }
                return modified
            }

            function dedupe(latest, extended, sealed) {
                // compare latest and sealed to ensure lifecycle hooks won't be duplicated
                // between merges
                if (Array.isArray(latest)) {
                    var res = [];
                    sealed = Array.isArray(sealed) ? sealed : [sealed];
                    extended = Array.isArray(extended) ? extended : [extended];
                    for (var i = 0; i < latest.length; i++) {
                        // push original options and not sealed options to exclude duplicated options
                        if (extended.indexOf(latest[i]) >= 0 || sealed.indexOf(latest[i]) < 0) {
                            res.push(latest[i]);
                        }
                    }
                    return res
                } else {
                    return latest
                }
            }

            function Vue$3(options) {
                if (false) {
                    warn('Vue is a constructor and should be called with the `new` keyword');
                }
                this._init(options);
            }

            initMixin(Vue$3);
            stateMixin(Vue$3);
            eventsMixin(Vue$3);
            lifecycleMixin(Vue$3);
            renderMixin(Vue$3);

            /*  */

            function initUse(Vue) {
                Vue.use = function (plugin) {
                    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 (false) {
                        if (!/^[a-zA-Z][\w-]*$/.test(name)) {
                            warn(
                                'Invalid component name: "' + name + '". Component names ' +
                                'can only contain alphanumeric characters and the hyphen, ' +
                                'and must start with a letter.'
                            );
                        }
                    }

                    var Sub = function VueComponent(options) {
                        this._init(options);
                    };
                    Sub.prototype = Object.create(Super.prototype);
                    Sub.prototype.constructor = Sub;
                    Sub.cid = cid++;
                    Sub.options = mergeOptions(
                        Super.options,
                        extendOptions
                    );
                    Sub['super'] = Super;

                    // For props and computed properties, we define the proxy getters on
                    // the Vue instances at extension time, on the extended prototype. This
                    // avoids Object.defineProperty calls for each instance created.
                    if (Sub.options.props) {
                        initProps$1(Sub);
                    }
                    if (Sub.options.computed) {
                        initComputed$1(Sub);
                    }

                    // allow further extension/mixin/plugin usage
                    Sub.extend = Super.extend;
                    Sub.mixin = Super.mixin;
                    Sub.use = Super.use;

                    // create asset registers, so extended classes
                    // can have their private assets too.
                    ASSET_TYPES.forEach(function (type) {
                        Sub[type] = Super[type];
                    });
                    // enable recursive self-lookup
                    if (name) {
                        Sub.options.components[name] = Sub;
                    }

                    // keep a reference to the super options at extension time.
                    // later at instantiation we can check if Super's options have
                    // been updated.
                    Sub.superOptions = Super.options;
                    Sub.extendOptions = extendOptions;
                    Sub.sealedOptions = extend({}, Sub.options);

                    // cache constructor
                    cachedCtors[SuperId] = Sub;
                    return Sub
                };
            }

            function initProps$1(Comp) {
                var props = Comp.options.props;
                for (var key in props) {
                    proxy(Comp.prototype, "_props", key);
                }
            }

            function initComputed$1(Comp) {
                var computed = Comp.options.computed;
                for (var key in computed) {
                    defineComputed(Comp.prototype, key, computed[key]);
                }
            }

            /*  */

            function initAssetRegisters(Vue) {
                /**
                 * Create asset registration methods.
                 */
                ASSET_TYPES.forEach(function (type) {
                    Vue[type] = function (
                        id,
                        definition
                    ) {
                        if (!definition) {
                            return this.options[type + 's'][id]
                        } else {
                            /* istanbul ignore if */
                            if (false) {
                                if (type === 'component' && config.isReservedTag(id)) {
                                    warn(
                                        'Do not use built-in or reserved HTML elements as component ' +
                                        'id: ' + id
                                    );
                                }
                            }
                            if (type === 'component' && isPlainObject(definition)) {
                                definition.name = definition.name || id;
                                definition = this.options._base.extend(definition);
                            }
                            if (type === 'directive' && typeof definition === 'function') {
                                definition = {
                                    bind: definition,
                                    update: definition
                                };
                            }
                            this.options[type + 's'][id] = definition;
                            return definition
                        }
                    };
                });
            }

            /*  */

            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() {
                    var this$1 = this;

                    for (var key in this$1.cache) {
                        pruneCacheEntry(this$1.cache, key, this$1.keys);
                    }
                },

                watch: {
                    include: function include(val) {
                        pruneCache(this, function (name) {
                            return matches(val, name);
                        });
                    },
                    exclude: function exclude(val) {
                        pruneCache(this, 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;
                };
                if (false) {
                    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
                };

                Vue.set = set;
                Vue.delete = del;
                Vue.nextTick = nextTick;

                Vue.options = Object.create(null);
                ASSET_TYPES.forEach(function (type) {
                    Vue.options[type + 's'] = Object.create(null);
                });

                // this is used to identify the "base" constructor to extend all plain-object
                // components with in Weex's multi-instance scenarios.
                Vue.options._base = Vue;

                extend(Vue.options.components, builtInComponents);

                initUse(Vue);
                initMixin$1(Vue);
                initExtend(Vue);
                initAssetRegisters(Vue);
            }

            initGlobalAPI(Vue$3);

            Object.defineProperty(Vue$3.prototype, '$isServer', {
                get: isServerRendering
            });

            Object.defineProperty(Vue$3.prototype, '$ssrContext', {
                get: function get() {
                    /* istanbul ignore next */
                    return this.$vnode && this.$vnode.ssrContext
                }
            });

            Vue$3.version = '2.5.9';

            /*  */

            // 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 isBooleanAttr = makeMap(
                'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
                'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
                'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
                'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
                'required,reversed,scoped,seamless,selected,sortable,translate,' +
                'truespeed,typemustmatch,visible'
            );

            var xlinkNS = 'http://www.w3.org/1999/xlink';

            var isXlink = function (name) {
                return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
            };

            var getXlinkProp = function (name) {
                return isXlink(name) ? name.slice(6, name.length) : ''
            };

            var isFalsyAttrValue = function (val) {
                return val == null || val === false
            };

            /*  */

            function genClassForVnode(vnode) {
                var data = vnode.data;
                var parentNode = vnode;
                var childNode = vnode;
                while (isDef(childNode.componentInstance)) {
                    childNode = childNode.componentInstance._vnode;
                    if (childNode.data) {
                        data = mergeClassData(childNode.data, data);
                    }
                }
                while (isDef(parentNode = parentNode.parent)) {
                    if (parentNode.data) {
                        data = mergeClassData(data, parentNode.data);
                    }
                }
                return 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) {
                    // http://stackoverflow.com/a/28210364/1070244
                    return (unknownElementCache[tag] = (
                        el.constructor === window.HTMLUnknownElement ||
                        el.constructor === window.HTMLElement
                    ))
                } else {
                    return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
                }
            }

            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) {
                        "production" !== 'production' && warn(
                            'Cannot find element: ' + el
                        );
                        return document.createElement('div')
                    }
                    return selected
                } else {
                    return el
                }
            }

            /*  */

            function createElement$1(tagName, vnode) {
                var elm = document.createElement(tagName);
                if (tagName !== 'select') {
                    return elm
                }
                // false or null will remove the attribute but undefined will not
                if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
                    elm.setAttribute('multiple', 'multiple');
                }
                return elm
            }

            function createElementNS(namespace, tagName) {
                return document.createElementNS(namespaceMap[namespace], tagName)
            }

            function createTextNode(text) {
                return document.createTextNode(text)
            }

            function createComment(text) {
                return document.createComment(text)
            }

            function insertBefore(parentNode, newNode, referenceNode) {
                parentNode.insertBefore(newNode, referenceNode);
            }

            function removeChild(node, child) {
                node.removeChild(child);
            }

            function appendChild(node, child) {
                node.appendChild(child);
            }

            function parentNode(node) {
                return node.parentNode
            }

            function nextSibling(node) {
                return node.nextSibling
            }

            function tagName(node) {
                return node.tagName
            }

            function setTextContent(node, text) {
                node.textContent = text;
            }

            function setAttribute(node, key, val) {
                node.setAttribute(key, val);
            }


            var nodeOps = Object.freeze({
                createElement: createElement$1,
                createElementNS: createElementNS,
                createTextNode: createTextNode,
                createComment: createComment,
                insertBefore: insertBefore,
                removeChild: removeChild,
                appendChild: appendChild,
                parentNode: parentNode,
                nextSibling: nextSibling,
                tagName: tagName,
                setTextContent: setTextContent,
                setAttribute: setAttribute
            });

            /*  */

            var ref = {
                create: function create(_, vnode) {
                    registerRef(vnode);
                },
                update: function update(oldVnode, vnode) {
                    if (oldVnode.data.ref !== vnode.data.ref) {
                        registerRef(oldVnode, true);
                        registerRef(vnode);
                    }
                },
                destroy: function destroy(vnode) {
                    registerRef(vnode, true);
                }
            };

            function registerRef(vnode, isRemoval) {
                var key = vnode.data.ref;
                if (!key) {
                    return
                }

                var vm = vnode.context;
                var ref = vnode.componentInstance || vnode.elm;
                var refs = vm.$refs;
                if (isRemoval) {
                    if (Array.isArray(refs[key])) {
                        remove(refs[key], ref);
                    } else if (refs[key] === ref) {
                        refs[key] = undefined;
                    }
                } else {
                    if (vnode.data.refInFor) {
                        if (!Array.isArray(refs[key])) {
                            refs[key] = [ref];
                        } else if (refs[key].indexOf(ref) < 0) {
                            // $flow-disable-line
                            refs[key].push(ref);
                        }
                    } else {
                        refs[key] = ref;
                    }
                }
            }

            /**
             * Virtual DOM patching algorithm based on Snabbdom by
             * Simon Friis Vindum (@paldepind)
             * Licensed under the MIT License
             * https://github.com/paldepind/snabbdom/blob/master/LICENSE
             *
             * modified by Evan You (@yyx990803)
             *
             * Not type-checking this because this file is perf-critical and the cost
             * of making flow understand it is not worth it.
             */

            var emptyNode = new VNode('', {}, []);

            var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];

            function sameVnode(a, b) {
                return (
                    a.key === b.key && (
                        (
                            a.tag === b.tag &&
                            a.isComment === b.isComment &&
                            isDef(a.data) === isDef(b.data) &&
                            sameInputType(a, b)
                        ) || (
                            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() {
                        if (--remove.listeners === 0) {
                            removeNode(childElm);
                        }
                    }
                    remove.listeners = listeners;
                    return remove
                }

                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) {
                    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 (false) {
                            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 (false) {
                            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 */ , parentElm, refElm);
                        }
                        // after calling the init hook, if the vnode is a child component
                        // it should've created a child instance and mounted it. the child
                        // component also has set the placeholder vnode's elm.
                        // in that case we can just return the element and be done.
                        if (isDef(vnode.componentInstance)) {
                            initComponent(vnode, insertedVnodeQueue);
                            if (isTrue(isReactivated)) {
                                reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
                            }
                            return true
                        }
                    }
                }

                function initComponent(vnode, insertedVnodeQueue) {
                    if (isDef(vnode.data.pendingInsert)) {
                        insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
                        vnode.data.pendingInsert = null;
                    }
                    vnode.elm = vnode.componentInstance.$el;
                    if (isPatchable(vnode)) {
                        invokeCreateHooks(vnode, insertedVnodeQueue);
                        setScope(vnode);
                    } else {
                        // empty component root.
                        // skip all element-related modules except for ref (#3455)
                        registerRef(vnode);
                        // make sure to invoke the insert hook
                        insertedVnodeQueue.push(vnode);
                    }
                }

                function reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm) {
                    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 (ref$$1.parentNode === parent) {
                                nodeOps.insertBefore(parent, elm, ref$$1);
                            }
                        } else {
                            nodeOps.appendChild(parent, elm);
                        }
                    }
                }

                function createChildren(vnode, children, insertedVnodeQueue) {
                    if (Array.isArray(children)) {
                        for (var i = 0; i < children.length; ++i) {
                            createElm(children[i], insertedVnodeQueue, vnode.elm, null, true);
                        }
                    } else if (isPrimitive(vnode.text)) {
                        nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(vnode.text));
                    }
                }

                function isPatchable(vnode) {
                    while (vnode.componentInstance) {
                        vnode = vnode.componentInstance._vnode;
                    }
                    return isDef(vnode.tag)
                }

                function invokeCreateHooks(vnode, insertedVnodeQueue) {
                    for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                        cbs.create[i$1](emptyNode, vnode);
                    }
                    i = vnode.data.hook; // Reuse variable
                    if (isDef(i)) {
                        if (isDef(i.create)) {
                            i.create(emptyNode, vnode);
                        }
                        if (isDef(i.insert)) {
                            insertedVnodeQueue.push(vnode);
                        }
                    }
                }

                // set scope id attribute for scoped CSS.
                // this is implemented as a special case to avoid the overhead
                // of going through the normal attribute patching process.
                function setScope(vnode) {
                    var i;
                    if (isDef(i = vnode.fnScopeId)) {
                        nodeOps.setAttribute(vnode.elm, i, '');
                    } else {
                        var ancestor = vnode;
                        while (ancestor) {
                            if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
                                nodeOps.setAttribute(vnode.elm, i, '');
                            }
                            ancestor = ancestor.parent;
                        }
                    }
                    // for slot content they should also get the scopeId from the host instance.
                    if (isDef(i = activeInstance) &&
                        i !== vnode.context &&
                        i !== vnode.fnContext &&
                        isDef(i = i.$options._scopeId)
                    ) {
                        nodeOps.setAttribute(vnode.elm, i, '');
                    }
                }

                function addVnodes(parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
                    for (; startIdx <= endIdx; ++startIdx) {
                        createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm);
                    }
                }

                function invokeDestroyHook(vnode) {
                    var i, j;
                    var data = vnode.data;
                    if (isDef(data)) {
                        if (isDef(i = data.hook) && isDef(i = i.destroy)) {
                            i(vnode);
                        }
                        for (i = 0; i < cbs.destroy.length; ++i) {
                            cbs.destroy[i](vnode);
                        }
                    }
                    if (isDef(i = vnode.children)) {
                        for (j = 0; j < vnode.children.length; ++j) {
                            invokeDestroyHook(vnode.children[j]);
                        }
                    }
                }

                function removeVnodes(parentElm, vnodes, startIdx, endIdx) {
                    for (; startIdx <= endIdx; ++startIdx) {
                        var ch = vnodes[startIdx];
                        if (isDef(ch)) {
                            if (isDef(ch.tag)) {
                                removeAndInvokeRemoveHook(ch);
                                invokeDestroyHook(ch);
                            } else { // Text node
                                removeNode(ch.elm);
                            }
                        }
                    }
                }

                function removeAndInvokeRemoveHook(vnode, rm) {
                    if (isDef(rm) || isDef(vnode.data)) {
                        var i;
                        var listeners = cbs.remove.length + 1;
                        if (isDef(rm)) {
                            // we have a recursively passed down rm callback
                            // increase the listeners count
                            rm.listeners += listeners;
                        } else {
                            // directly removing
                            rm = createRmCb(vnode.elm, listeners);
                        }
                        // recursively invoke hooks on child component root node
                        if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
                            removeAndInvokeRemoveHook(i, rm);
                        }
                        for (i = 0; i < cbs.remove.length; ++i) {
                            cbs.remove[i](vnode, rm);
                        }
                        if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
                            i(vnode, rm);
                        } else {
                            rm();
                        }
                    } else {
                        removeNode(vnode.elm);
                    }
                }

                function updateChildren(parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
                    var oldStartIdx = 0;
                    var newStartIdx = 0;
                    var oldEndIdx = oldCh.length - 1;
                    var oldStartVnode = oldCh[0];
                    var oldEndVnode = oldCh[oldEndIdx];
                    var newEndIdx = newCh.length - 1;
                    var newStartVnode = newCh[0];
                    var newEndVnode = newCh[newEndIdx];
                    var oldKeyToIdx, idxInOld, 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;

                    while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
                        if (isUndef(oldStartVnode)) {
                            oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
                        } else if (isUndef(oldEndVnode)) {
                            oldEndVnode = oldCh[--oldEndIdx];
                        } else if (sameVnode(oldStartVnode, newStartVnode)) {
                            patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
                            oldStartVnode = oldCh[++oldStartIdx];
                            newStartVnode = newCh[++newStartIdx];
                        } else if (sameVnode(oldEndVnode, newEndVnode)) {
                            patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
                            oldEndVnode = oldCh[--oldEndIdx];
                            newEndVnode = newCh[--newEndIdx];
                        } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
                            patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
                            canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
                            oldStartVnode = oldCh[++oldStartIdx];
                            newEndVnode = newCh[--newEndIdx];
                        } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
                            patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
                            canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
                            oldEndVnode = oldCh[--oldEndIdx];
                            newStartVnode = newCh[++newStartIdx];
                        } else {
                            if (isUndef(oldKeyToIdx)) {
                                oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx);
                            }
                            idxInOld = isDef(newStartVnode.key) ?
                                oldKeyToIdx[newStartVnode.key] :
                                findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);
                            if (isUndef(idxInOld)) { // New element
                                createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
                            } else {
                                vnodeToMove = oldCh[idxInOld];
                                /* istanbul ignore if */
                                if (false) {
                                    warn(
                                        'It seems there are duplicate keys that is causing an update error. ' +
                                        'Make sure each v-for item has a unique key.'
                                    );
                                }
                                if (sameVnode(vnodeToMove, newStartVnode)) {
                                    patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue);
                                    oldCh[idxInOld] = undefined;
                                    canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);
                                } else {
                                    // same key but different element. treat as new element
                                    createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
                                }
                            }
                            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 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, removeOnly) {
                    if (oldVnode === vnode) {
                        return
                    }

                    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)) {
                            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 (false) {
                        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 (false) {
                                            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 (false) {
                                            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, parentElm, refElm) {
                    if (isUndef(vnode)) {
                        if (isDef(oldVnode)) {
                            invokeDestroyHook(oldVnode);
                        }
                        return
                    }

                    var isInitialPatch = false;
                    var insertedVnodeQueue = [];

                    if (isUndef(oldVnode)) {
                        // empty mount (likely as component), create new root element
                        isInitialPatch = true;
                        createElm(vnode, insertedVnodeQueue, parentElm, refElm);
                    } else {
                        var isRealElement = isDef(oldVnode.nodeType);
                        if (!isRealElement && sameVnode(oldVnode, vnode)) {
                            // patch existing root node
                            patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly);
                        } else {
                            if (isRealElement) {
                                // mounting to a real element
                                // check if this is server-rendered content and if we can perform
                                // a successful hydration.
                                if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
                                    oldVnode.removeAttribute(SSR_ATTR);
                                    hydrating = true;
                                }
                                if (isTrue(hydrating)) {
                                    if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
                                        invokeInsertHook(vnode, insertedVnodeQueue, true);
                                        return oldVnode
                                    } else if (false) {
                                        warn(
                                            'The client-side rendered virtual DOM tree is not matching ' +
                                            'server-rendered content. This is likely caused by incorrect ' +
                                            'HTML markup, for example nesting block-level elements inside ' +
                                            '<p>, or missing <tbody>. Bailing hydration and performing ' +
                                            'full client-side render.'
                                        );
                                    }
                                }
                                // either not server-rendered, or hydration failed.
                                // create an empty node and replace it
                                oldVnode = emptyNodeAt(oldVnode);
                            }

                            // replacing existing element
                            var oldElm = oldVnode.elm;
                            var parentElm$1 = nodeOps.parentNode(oldElm);

                            // 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$1,
                                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$1)) {
                                removeVnodes(parentElm$1, [oldVnode], 0, 0);
                            } else if (isDef(oldVnode.tag)) {
                                invokeDestroyHook(oldVnode);
                            }
                        }
                    }

                    invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
                    return vnode.elm
                }
            }

            /*  */

            var directives = {
                create: updateDirectives,
                update: updateDirectives,
                destroy: function unbindDirectives(vnode) {
                    updateDirectives(vnode, emptyNode);
                }
            };

            function updateDirectives(oldVnode, vnode) {
                if (oldVnode.data.directives || vnode.data.directives) {
                    _update(oldVnode, vnode);
                }
            }

            function _update(oldVnode, vnode) {
                var isCreate = oldVnode === emptyNode;
                var isDestroy = vnode === emptyNode;
                var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
                var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);

                var dirsWithInsert = [];
                var dirsWithPostpatch = [];

                var key, oldDir, dir;
                for (key in newDirs) {
                    oldDir = oldDirs[key];
                    dir = newDirs[key];
                    if (!oldDir) {
                        // new directive, bind
                        callHook$1(dir, 'bind', vnode, oldVnode);
                        if (dir.def && dir.def.inserted) {
                            dirsWithInsert.push(dir);
                        }
                    } else {
                        // existing directive, update
                        dir.oldValue = oldDir.value;
                        callHook$1(dir, 'update', vnode, oldVnode);
                        if (dir.def && dir.def.componentUpdated) {
                            dirsWithPostpatch.push(dir);
                        }
                    }
                }

                if (dirsWithInsert.length) {
                    var callInsert = function () {
                        for (var i = 0; i < dirsWithInsert.length; i++) {
                            callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
                        }
                    };
                    if (isCreate) {
                        mergeVNodeHook(vnode, '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$1(
                dirs,
                vm
            ) {
                var res = Object.create(null);
                if (!dirs) {
                    return res
                }
                var i, dir;
                for (i = 0; i < dirs.length; i++) {
                    dir = dirs[i];
                    if (!dir.modifiers) {
                        dir.modifiers = emptyModifiers;
                    }
                    res[getRawDirName(dir)] = dir;
                    dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
                }
                return res
            }

            function getRawDirName(dir) {
                return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
            }

            function callHook$1(dir, hook, vnode, oldVnode, isDestroy) {
                var fn = dir.def && dir.def[hook];
                if (fn) {
                    try {
                        fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
                    } catch (e) {
                        handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
                    }
                }
            }

            var baseModules = [
                ref,
                directives
            ];

            /*  */

            function updateAttrs(oldVnode, vnode) {
                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 (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, isFalsyAttrValue(value) || value === 'false' ? 'false' : 'true');
                } else if (isXlink(key)) {
                    if (isFalsyAttrValue(value)) {
                        el.removeAttributeNS(xlinkNS, getXlinkProp(key));
                    } else {
                        el.setAttributeNS(xlinkNS, key, value);
                    }
                } else {
                    if (isFalsyAttrValue(value)) {
                        el.removeAttribute(key);
                    } else {
                        // #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' && !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)
                }
            }

            /*  */

            function baseWarn(msg) {
                console.error(("[Vue compiler]: " + msg));
            }

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

            function addProp(el, name, value) {
                (el.props || (el.props = [])).push({
                    name: name,
                    value: value
                });
            }

            function addAttr(el, name, value) {
                (el.attrs || (el.attrs = [])).push({
                    name: name,
                    value: value
                });
            }

            function addDirective(
                el,
                name,
                rawName,
                value,
                arg,
                modifiers
            ) {
                (el.directives || (el.directives = [])).push({
                    name: name,
                    rawName: rawName,
                    value: value,
                    arg: arg,
                    modifiers: modifiers
                });
            }

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

                // check capture modifier
                if (modifiers.capture) {
                    delete modifiers.capture;
                    name = '!' + name; // mark the event as captured
                }
                if (modifiers.once) {
                    delete modifiers.once;
                    name = '~' + name; // mark the event as once
                }
                /* istanbul ignore if */
                if (modifiers.passive) {
                    delete modifiers.passive;
                    name = '&' + name; // mark the event as passive
                }

                // 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 (name === 'click') {
                    if (modifiers.right) {
                        name = 'contextmenu';
                        delete modifiers.right;
                    } else if (modifiers.middle) {
                        name = 'mouseup';
                    }
                }

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

                var newHandler = {
                    value: value
                };
                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;
                }
            }

            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
            }

            /*  */

            /**
             * Cross-platform code generation for component v-model
             */
            function genComponentModel(
                el,
                value,
                modifiers
            ) {
                var ref = modifiers || {};
                var number = ref.number;
                var trim = ref.trim;

                var baseValueExpression = '$$v';
                var valueExpression = baseValueExpression;
                if (trim) {
                    valueExpression =
                        "(typeof " + baseValueExpression + " === 'string'" +
                        "? " + baseValueExpression + ".trim()" +
                        ": " + baseValueExpression + ")";
                }
                if (number) {
                    valueExpression = "_n(" + valueExpression + ")";
                }
                var assignment = genAssignmentCode(value, valueExpression);

                el.model = {
                    value: ("(" + value + ")"),
                    expression: ("\"" + value + "\""),
                    callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
                };
            }

            /**
             * Cross-platform codegen helper for generating v-model value assignment code.
             */
            function genAssignmentCode(
                value,
                assignment
            ) {
                var 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;
            var str;
            var chr;
            var index$1;
            var expressionPos;
            var expressionEndPos;



            function parseModel(val) {
                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;

                if (false) {
                    // inputs with type="file" are read only and setting the input's
                    // value will throw an error.
                    if (tag === 'input' && type === 'file') {
                        warn$1(
                            "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
                            "File inputs are read only. Use a v-on:change listener instead."
                        );
                    }
                }

                if (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 if (false) {
                    warn$1(
                        "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                        "v-model is not supported on this element type. " +
                        'If you are working with contenteditable, it\'s recommended to ' +
                        'wrap a library dedicated for that purpose inside a custom component.'
                    );
                }

                // ensure runtime directive metadata
                return true
            }

            function genCheckboxModel(
                el,
                value,
                modifiers
            ) {
                var number = modifiers && modifiers.number;
                var valueBinding = getBindingAttr(el, 'value') || 'null';
                var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
                var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
                addProp(el, 'checked',
                    "Array.isArray(" + value + ")" +
                    "?_i(" + value + "," + valueBinding + ")>-1" + (
                        trueValueBinding === 'true' ?
                        (":(" + value + ")") :
                        (":_q(" + value + "," + trueValueBinding + ")")
                    )
                );
                addHandler(el, '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){$$i<0&&(" + value + "=$$a.concat([$$v]))}" +
                    "else{$$i>-1&&(" + value + "=$$a.slice(0,$$i).concat($$a.slice($$i+1)))}" +
                    "}else{" + (genAssignmentCode(value, '$$c')) + "}",
                    null, true
                );
            }

            function genRadioModel(
                el,
                value,
                modifiers
            ) {
                var number = modifiers && modifiers.number;
                var valueBinding = getBindingAttr(el, 'value') || 'null';
                valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
                addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
                addHandler(el, '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
                if (false) {
                    var value$1 = el.attrsMap['v-bind:value'] || el.attrsMap[':value'];
                    if (value$1) {
                        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'
                        );
                    }
                }

                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(handler, event, 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);
                    }
                }
            }

            function add$1(
                event,
                handler,
                once$$1,
                capture,
                passive
            ) {
                handler = withMacroTask(handler);
                if (once$$1) {
                    handler = createOnceHandler(handler, event, capture);
                }
                target$1.addEventListener(
                    event,
                    handler,
                    supportsPassive ?
                    {
                        capture: capture,
                        passive: passive
                    } :
                    capture
                );
            }

            function remove$2(
                event,
                handler,
                capture,
                _target
            ) {
                (_target || target$1).removeEventListener(
                    event,
                    handler._withTask || handler,
                    capture
                );
            }

            function updateDOMListeners(oldVnode, vnode) {
                if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
                    return
                }
                var on = vnode.data.on || {};
                var oldOn = oldVnode.data.on || {};
                target$1 = vnode.elm;
                normalizeEvents(on);
                updateListeners(on, oldOn, add$1, remove$2, vnode.context);
                target$1 = undefined;
            }

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

            /*  */

            function updateDOMProps(oldVnode, vnode) {
                if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
                    return
                }
                var key, cur;
                var elm = vnode.elm;
                var oldProps = oldVnode.data.domProps || {};
                var props = vnode.data.domProps || {};
                // clone observed objects, as the user probably wants to mutate it
                if (isDef(props.__ob__)) {
                    props = vnode.data.domProps = extend({}, props);
                }

                for (key in oldProps) {
                    if (isUndef(props[key])) {
                        elm[key] = '';
                    }
                }
                for (key in props) {
                    cur = props[key];
                    // ignore children if the node has textContent or innerHTML,
                    // as these will throw away existing DOM nodes and cause removal errors
                    // on subsequent patches (#3360)
                    if (key === 'textContent' || key === 'innerHTML') {
                        if (vnode.children) {
                            vnode.children.length = 0;
                        }
                        if (cur === oldProps[key]) {
                            continue
                        }
                        // #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') {
                        // 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 {
                        elm[key] = cur;
                    }
                }
            }

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


            function shouldUpdateValue(elm, checkVal) {
                return (!elm.composing && (
                    elm.tagName === 'OPTION' ||
                    isDirty(elm, checkVal) ||
                    isInputChanged(elm, checkVal)
                ))
            }

            function isDirty(elm, checkVal) {
                // return true when textbox (.number and .trim) loses focus and its value is
                // not equal to the updated value
                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 isInputChanged(elm, newVal) {
                var value = elm.value;
                var modifiers = elm._vModifiers; // injected by v-model runtime
                if (isDef(modifiers) && modifiers.number) {
                    return toNumber(value) !== toNumber(newVal)
                }
                if (isDef(modifiers) && modifiers.trim) {
                    return value.trim() !== newVal.trim()
                }
                return value !== newVal
            }

            var domProps = {
                create: updateDOMProps,
                update: updateDOMProps
            };

            /*  */

            var parseStyleText = cached(function (cssText) {
                var res = {};
                var listDelimiter = /;(?![^(]*\))/g;
                var propertyDelimiter = /:(.+)/;
                cssText.split(listDelimiter).forEach(function (item) {
                    if (item) {
                        var tmp = item.split(propertyDelimiter);
                        tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
                    }
                });
                return res
            });

            // merge static and dynamic style data on the same vnode
            function normalizeStyleData(data) {
                var style = normalizeStyleBinding(data.style);
                // static style is pre-processed into an object during compilation
                // and is always a fresh object, so it's safe to merge into it
                return data.staticStyle ?
                    extend(data.staticStyle, style) :
                    style
            }

            // normalize possible array / string values into Object
            function normalizeStyleBinding(bindingStyle) {
                if (Array.isArray(bindingStyle)) {
                    return toObject(bindingStyle)
                }
                if (typeof bindingStyle === 'string') {
                    return parseStyleText(bindingStyle)
                }
                return bindingStyle
            }

            /**
             * parent component style should be after child's
             * so that parent component's style could override it
             */
            function getStyle(vnode, checkChild) {
                var res = {};
                var styleData;

                if (checkChild) {
                    var childNode = vnode;
                    while (childNode.componentInstance) {
                        childNode = childNode.componentInstance._vnode;
                        if (childNode.data && (styleData = normalizeStyleData(childNode.data))) {
                            extend(res, styleData);
                        }
                    }
                }

                if ((styleData = normalizeStyleData(vnode.data))) {
                    extend(res, styleData);
                }

                var parentNode = vnode;
                while ((parentNode = parentNode.parent)) {
                    if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
                        extend(res, styleData);
                    }
                }
                return res
            }

            /*  */

            var cssVarRE = /^--/;
            var importantRE = /\s*!important$/;
            var setProp = function (el, name, val) {
                /* istanbul ignore if */
                if (cssVarRE.test(name)) {
                    el.style.setProperty(name, val);
                } else if (importantRE.test(val)) {
                    el.style.setProperty(name, val.replace(importantRE, ''), 'important');
                } else {
                    var normalizedName = normalize(name);
                    if (Array.isArray(val)) {
                        // Support values array created by autoprefixer, e.g.
                        // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
                        // Set them one by one, and the browser will only set those it can recognize
                        for (var i = 0, len = val.length; i < len; i++) {
                            el.style[normalizedName] = val[i];
                        }
                    } else {
                        el.style[normalizedName] = val;
                    }
                }
            };

            var 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
            };

            /*  */

            /**
             * Add class with compatibility for SVG since classList is not supported on
             * SVG elements in IE
             */
            function addClass(el, cls) {
                /* istanbul ignore if */
                if (!cls || !(cls = cls.trim())) {
                    return
                }

                /* istanbul ignore else */
                if (el.classList) {
                    if (cls.indexOf(' ') > -1) {
                        cls.split(/\s+/).forEach(function (c) {
                            return el.classList.add(c);
                        });
                    } else {
                        el.classList.add(cls);
                    }
                } else {
                    var cur = " " + (el.getAttribute('class') || '') + " ";
                    if (cur.indexOf(' ' + cls + ' ') < 0) {
                        el.setAttribute('class', (cur + cls).trim());
                    }
                }
            }

            /**
             * Remove class with compatibility for SVG since classList is not supported on
             * SVG elements in IE
             */
            function removeClass(el, cls) {
                /* istanbul ignore if */
                if (!cls || !(cls = cls.trim())) {
                    return
                }

                /* istanbul ignore else */
                if (el.classList) {
                    if (cls.indexOf(' ') > -1) {
                        cls.split(/\s+/).forEach(function (c) {
                            return el.classList.remove(c);
                        });
                    } else {
                        el.classList.remove(cls);
                    }
                    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) {
                if (!def) {
                    return
                }
                /* istanbul ignore else */
                if (typeof def === 'object') {
                    var res = {};
                    if (def.css !== false) {
                        extend(res, autoCssTransition(def.name || 'v'));
                    }
                    extend(res, def);
                    return res
                } else if (typeof def === 'string') {
                    return autoCssTransition(def)
                }
            }

            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);
                var transitionDelays = styles[transitionProp + 'Delay'].split(', ');
                var transitionDurations = styles[transitionProp + 'Duration'].split(', ');
                var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
                var animationDelays = styles[animationProp + 'Delay'].split(', ');
                var animationDurations = styles[animationProp + 'Duration'].split(', ');
                var animationTimeout = getTimeout(animationDelays, animationDurations);

                var type;
                var timeout = 0;
                var propCount = 0;
                /* istanbul ignore if */
                if (expectedType === TRANSITION) {
                    if (transitionTimeout > 0) {
                        type = TRANSITION;
                        timeout = transitionTimeout;
                        propCount = transitionDurations.length;
                    }
                } else if (expectedType === ANIMATION) {
                    if (animationTimeout > 0) {
                        type = ANIMATION;
                        timeout = animationTimeout;
                        propCount = animationDurations.length;
                    }
                } else {
                    timeout = Math.max(transitionTimeout, animationTimeout);
                    type = timeout > 0 ?
                        transitionTimeout > animationTimeout ?
                        TRANSITION :
                        ANIMATION :
                        null;
                    propCount = type ?
                        type === TRANSITION ?
                        transitionDurations.length :
                        animationDurations.length :
                        0;
                }
                var hasTransform =
                    type === TRANSITION &&
                    transformRE.test(styles[transitionProp + 'Property']);
                return {
                    type: type,
                    timeout: timeout,
                    propCount: propCount,
                    hasTransform: hasTransform
                }
            }

            function getTimeout(delays, durations) {
                /* istanbul ignore next */
                while (delays.length < durations.length) {
                    delays = delays.concat(delays);
                }

                return Math.max.apply(null, durations.map(function (d, i) {
                    return toMs(d) + toMs(delays[i])
                }))
            }

            function toMs(s) {
                return Number(s.slice(0, -1)) * 1000
            }

            /*  */

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

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

                var data = resolveTransition(vnode.data.transition);
                if (isUndef(data)) {
                    return
                }

                /* istanbul ignore if */
                if (isDef(el._enterCb) || el.nodeType !== 1) {
                    return
                }

                var css = data.css;
                var type = data.type;
                var enterClass = data.enterClass;
                var enterToClass = data.enterToClass;
                var enterActiveClass = data.enterActiveClass;
                var appearClass = data.appearClass;
                var appearToClass = data.appearToClass;
                var appearActiveClass = data.appearActiveClass;
                var beforeEnter = data.beforeEnter;
                var enter = data.enter;
                var afterEnter = data.afterEnter;
                var enterCancelled = data.enterCancelled;
                var beforeAppear = data.beforeAppear;
                var appear = data.appear;
                var afterAppear = data.afterAppear;
                var appearCancelled = data.appearCancelled;
                var duration = data.duration;

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

                var isAppear = !context._isMounted || !vnode.isRootInsert;

                if (isAppear && !appear && appear !== '') {
                    return
                }

                var startClass = isAppear && appearClass ?
                    appearClass :
                    enterClass;
                var activeClass = isAppear && appearActiveClass ?
                    appearActiveClass :
                    enterActiveClass;
                var toClass = isAppear && appearToClass ?
                    appearToClass :
                    enterToClass;

                var beforeEnterHook = isAppear ?
                    (beforeAppear || beforeEnter) :
                    beforeEnter;
                var enterHook = isAppear ?
                    (typeof appear === 'function' ? appear : enter) :
                    enter;
                var afterEnterHook = isAppear ?
                    (afterAppear || afterEnter) :
                    afterEnter;
                var enterCancelledHook = isAppear ?
                    (appearCancelled || enterCancelled) :
                    enterCancelled;

                var explicitEnterDuration = toNumber(
                    isObject(duration) ?
                    duration.enter :
                    duration
                );

                if (false) {
                    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 () {
                        addTransitionClass(el, toClass);
                        removeTransitionClass(el, startClass);
                        if (!cb.cancelled && !userWantsControl) {
                            if (isValidDuration(explicitEnterDuration)) {
                                setTimeout(cb, explicitEnterDuration);
                            } else {
                                whenTransitionEnds(el, type, cb);
                            }
                        }
                    });
                }

                if (vnode.data.show) {
                    toggleDisplay && toggleDisplay();
                    enterHook && enterHook(el, cb);
                }

                if (!expectsCSS && !userWantsControl) {
                    cb();
                }
            }

            function leave(vnode, rm) {
                var el = vnode.elm;

                // call enter callback now
                if (isDef(el._enterCb)) {
                    el._enterCb.cancelled = true;
                    el._enterCb();
                }

                var data = resolveTransition(vnode.data.transition);
                if (isUndef(data) || 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 (false) {
                    checkDuration(explicitLeaveDuration, 'leave', vnode);
                }

                var cb = el._leaveCb = once(function () {
                    if (el.parentNode && el.parentNode._pending) {
                        el.parentNode._pending[vnode.key] = null;
                    }
                    if (expectsCSS) {
                        removeTransitionClass(el, leaveToClass);
                        removeTransitionClass(el, leaveActiveClass);
                    }
                    if (cb.cancelled) {
                        if (expectsCSS) {
                            removeTransitionClass(el, leaveClass);
                        }
                        leaveCancelled && leaveCancelled(el);
                    } else {
                        rm();
                        afterLeave && afterLeave(el);
                    }
                    el._leaveCb = null;
                });

                if (delayLeave) {
                    delayLeave(performLeave);
                } else {
                    performLeave();
                }

                function performLeave() {
                    // the delayed leave may have already been cancelled
                    if (cb.cancelled) {
                        return
                    }
                    // record leaving element
                    if (!vnode.data.show) {
                        (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
                    }
                    beforeLeave && beforeLeave(el);
                    if (expectsCSS) {
                        addTransitionClass(el, leaveClass);
                        addTransitionClass(el, leaveActiveClass);
                        nextFrame(function () {
                            addTransitionClass(el, leaveToClass);
                            removeTransitionClass(el, leaveClass);
                            if (!cb.cancelled && !userWantsControl) {
                                if (isValidDuration(explicitLeaveDuration)) {
                                    setTimeout(cb, explicitLeaveDuration);
                                } else {
                                    whenTransitionEnds(el, type, cb);
                                }
                            }
                        });
                    }
                    leave && leave(el, cb);
                    if (!expectsCSS && !userWantsControl) {
                        cb();
                    }
                }
            }

            // only used in dev mode
            function checkDuration(val, name, vnode) {
                if (typeof val !== 'number') {
                    warn(
                        "<transition> explicit " + name + " duration is not a valid number - " +
                        "got " + (JSON.stringify(val)) + ".",
                        vnode.context
                    );
                } else if (isNaN(val)) {
                    warn(
                        "<transition> explicit " + name + " duration is NaN - " +
                        'the duration expression might be incorrect.',
                        vnode.context
                    );
                }
            }

            function isValidDuration(val) {
                return typeof val === 'number' && !isNaN(val)
            }

            /**
             * Normalize a transition hook's argument length. The hook may be:
             * - a merged hook (invoker) with the original in .fns
             * - a wrapped component method (check ._length)
             * - a plain function (.length)
             */
            function getHookArgumentsLength(fn) {
                if (isUndef(fn)) {
                    return false
                }
                var invokerFns = fn.fns;
                if (isDef(invokerFns)) {
                    // invoker
                    return getHookArgumentsLength(
                        Array.isArray(invokerFns) ?
                        invokerFns[0] :
                        invokerFns
                    )
                } else {
                    return (fn._length || fn.length) > 1
                }
            }

            function _enter(_, vnode) {
                if (vnode.data.show !== true) {
                    enter(vnode);
                }
            }

            var transition = inBrowser ? {
                create: _enter,
                activate: _enter,
                remove: function remove$$1(vnode, rm) {
                    /* istanbul ignore else */
                    if (vnode.data.show !== true) {
                        leave(vnode, rm);
                    } else {
                        rm();
                    }
                }
            } : {};

            var platformModules = [
                attrs,
                klass,
                events,
                domProps,
                style,
                transition
            ];

            /*  */

            // the directive module should be applied last, after all
            // built-in modules have been applied.
            var modules = platformModules.concat(baseModules);

            var patch = createPatchFunction({
                nodeOps: nodeOps,
                modules: modules
            });

            /**
             * Not type checking this file because flow doesn't like attaching
             * properties to Elements.
             */

            /* istanbul ignore if */
            if (isIE9) {
                // http://www.matts411.com/post/internet-explorer-9-oninput/
                document.addEventListener('selectionchange', function () {
                    var el = document.activeElement;
                    if (el && el.vmodel) {
                        trigger(el, 'input');
                    }
                });
            }

            var 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) {
                            // Safari < 10.2 & UIWebView doesn't fire compositionend when
                            // switching focus before confirming composition choice
                            // this also fixes the issue where some browsers e.g. iOS Chrome
                            // fires "change" instead of "input" on autocomplete.
                            el.addEventListener('change', onCompositionEnd);
                            if (!isAndroid) {
                                el.addEventListener('compositionstart', onCompositionStart);
                                el.addEventListener('compositionend', onCompositionEnd);
                            }
                            /* istanbul ignore if */
                            if (isIE9) {
                                el.vmodel = true;
                            }
                        }
                    }
                },

                componentUpdated: function componentUpdated(el, binding, vnode) {
                    if (vnode.tag === 'select') {
                        setSelected(el, binding, vnode.context);
                        // in case the options rendered by v-for have changed,
                        // it's possible that the value is out-of-sync with the rendered options.
                        // detect such cases and filter out values that no longer has a matching
                        // option in the DOM.
                        var 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)) {
                    "production" !== 'production' && warn(
                        "<select multiple v-model=\"" + (binding.expression) + "\"> " +
                        "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
                        vm
                    );
                    return
                }
                var selected, option;
                for (var i = 0, l = el.options.length; i < l; i++) {
                    option = el.options[i];
                    if (isMultiple) {
                        selected = looseIndexOf(value, getValue(option)) > -1;
                        if (option.selected !== selected) {
                            option.selected = selected;
                        }
                    } else {
                        if (looseEqual(getValue(option), value)) {
                            if (el.selectedIndex !== i) {
                                el.selectedIndex = i;
                            }
                            return
                        }
                    }
                }
                if (!isMultiple) {
                    el.selectedIndex = -1;
                }
            }

            function hasNoMatchingOption(value, options) {
                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
            };

            /*  */

            // Provides transition support for a single element/component.
            // supports transition mode (out-in / in-out)

            var transitionProps = {
                name: String,
                appear: Boolean,
                css: Boolean,
                mode: String,
                type: String,
                enterClass: String,
                leaveClass: String,
                enterToClass: String,
                leaveToClass: String,
                enterActiveClass: String,
                leaveActiveClass: String,
                appearClass: String,
                appearActiveClass: String,
                appearToClass: String,
                duration: [Number, String, Object]
            };

            // in case the child is also an abstract component, e.g. <keep-alive>
            // we want to recursively retrieve the real component to be rendered
            function getRealChild(vnode) {
                var compOptions = vnode && vnode.componentOptions;
                if (compOptions && compOptions.Ctor.options.abstract) {
                    return getRealChild(getFirstComponentChild(compOptions.children))
                } else {
                    return vnode
                }
            }

            function extractTransitionData(comp) {
                var data = {};
                var options = comp.$options;
                // props
                for (var key in options.propsData) {
                    data[key] = comp[key];
                }
                // events.
                // extract listeners and pass them directly to the transition methods
                var listeners = options._parentListeners;
                for (var key$1 in listeners) {
                    data[camelize(key$1)] = listeners[key$1];
                }
                return data
            }

            function placeholder(h, rawChild) {
                if (/\d-keep-alive$/.test(rawChild.tag)) {
                    return h('keep-alive', {
                        props: rawChild.componentOptions.propsData
                    })
                }
            }

            function hasParentTransition(vnode) {
                while ((vnode = vnode.parent)) {
                    if (vnode.data.transition) {
                        return true
                    }
                }
            }

            function isSameChild(child, oldChild) {
                return oldChild.key === child.key && oldChild.tag === child.tag
            }

            var Transition = {
                name: 'transition',
                props: transitionProps,
                abstract: true,

                render: function render(h) {
                    var this$1 = this;

                    var children = this.$slots.default;
                    if (!children) {
                        return
                    }

                    // filter out text nodes (possible whitespaces)
                    children = children.filter(function (c) {
                        return c.tag || isAsyncPlaceholder(c);
                    });
                    /* istanbul ignore if */
                    if (!children.length) {
                        return
                    }

                    // warn multiple elements
                    if (false) {
                        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 (false) {
                        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(function (d) {
                            return d.name === 'show';
                        })) {
                        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
                }
            };

            /*  */

            // Provides transition support for list items.
            // supports move transitions using the FLIP technique.

            // Because the vdom's children update algorithm is "unstable" - i.e.
            // it doesn't guarantee the relative positioning of removed elements,
            // we force transition-group to update its children into two passes:
            // in the first pass, we remove all nodes that need to be removed,
            // triggering their leaving transition; in the second pass, we insert/move
            // into the final desired state. This way in the second pass removed
            // nodes will remain where they should be.

            var props = extend({
                tag: String,
                moveClass: String
            }, transitionProps);

            delete props.mode;

            var TransitionGroup = {
                props: props,

                render: function render(h) {
                    var tag = this.tag || this.$vnode.data.tag || 'span';
                    var map = Object.create(null);
                    var prevChildren = this.prevChildren = this.children;
                    var rawChildren = this.$slots.default || [];
                    var children = this.children = [];
                    var transitionData = extractTransitionData(this);

                    for (var i = 0; i < rawChildren.length; i++) {
                        var c = rawChildren[i];
                        if (c.tag) {
                            if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
                                children.push(c);
                                map[c.key] = c;
                                (c.data || (c.data = {})).transition = transitionData;
                            } else if (false) {
                                var opts = c.componentOptions;
                                var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
                                warn(("<transition-group> children must be keyed: <" + name + ">"));
                            }
                        }
                    }

                    if (prevChildren) {
                        var kept = [];
                        var removed = [];
                        for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
                            var c$1 = prevChildren[i$1];
                            c$1.data.transition = transitionData;
                            c$1.data.pos = c$1.elm.getBoundingClientRect();
                            if (map[c$1.key]) {
                                kept.push(c$1);
                            } else {
                                removed.push(c$1);
                            }
                        }
                        this.kept = h(tag, null, kept);
                        this.removed = removed;
                    }

                    return h(tag, null, children)
                },

                beforeUpdate: function beforeUpdate() {
                    // force removing pass
                    this.__patch__(
                        this._vnode,
                        this.kept,
                        false, // hydrating
                        true // removeOnly (!important, avoids unnecessary moves)
                    );
                    this._vnode = this.kept;
                },

                updated: function updated() {
                    var children = this.prevChildren;
                    var moveClass = this.moveClass || ((this.name || 'v') + '-move');
                    if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
                        return
                    }

                    // we divide the work into three loops to avoid mixing DOM reads and writes
                    // in each iteration - which helps prevent layout thrashing.
                    children.forEach(callPendingCbs);
                    children.forEach(recordPosition);
                    children.forEach(applyTranslation);

                    // force reflow to put everything in position
                    // 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 || /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$3.config.mustUseProp = mustUseProp;
            Vue$3.config.isReservedTag = isReservedTag;
            Vue$3.config.isReservedAttr = isReservedAttr;
            Vue$3.config.getTagNamespace = getTagNamespace;
            Vue$3.config.isUnknownElement = isUnknownElement;

            // install platform runtime directives & components
            extend(Vue$3.options.directives, platformDirectives);
            extend(Vue$3.options.components, platformComponents);

            // install platform patch function
            Vue$3.prototype.__patch__ = inBrowser ? patch : noop;

            // public mount method
            Vue$3.prototype.$mount = function (
                el,
                hydrating
            ) {
                el = el && inBrowser ? query(el) : undefined;
                return mountComponent(this, el, hydrating)
            };

            // devtools global hook
            /* istanbul ignore next */
            Vue$3.nextTick(function () {
                if (config.devtools) {
                    if (devtools) {
                        devtools.emit('init', Vue$3);
                    } else if (false) {
                        console[console.info ? 'info' : 'log'](
                            'Download the Vue Devtools extension for a better development experience:\n' +
                            'https://github.com/vuejs/vue-devtools'
                        );
                    }
                }
                if (false) {
                    console[console.info ? 'info' : 'log'](
                        "You are running Vue in development mode.\n" +
                        "Make sure to turn on production mode when deploying for production.\n" +
                        "See more tips at https://vuejs.org/guide/deployment.html"
                    );
                }
            }, 0);

            /*  */

            var defaultTagRE = /\{\{((?:.|\n)+?)\}\}/g;
            var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;

            var buildRegex = cached(function (delimiters) {
                var open = delimiters[0].replace(regexEscapeRE, '\\$&');
                var close = delimiters[1].replace(regexEscapeRE, '\\$&');
                return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
            });

            function parseText(
                text,
                delimiters
            ) {
                var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
                if (!tagRE.test(text)) {
                    return
                }
                var tokens = [];
                var lastIndex = tagRE.lastIndex = 0;
                var match, index;
                while ((match = tagRE.exec(text))) {
                    index = match.index;
                    // push text token
                    if (index > lastIndex) {
                        tokens.push(JSON.stringify(text.slice(lastIndex, index)));
                    }
                    // tag token
                    var exp = parseFilters(match[1].trim());
                    tokens.push(("_s(" + exp + ")"));
                    lastIndex = index + match[0].length;
                }
                if (lastIndex < text.length) {
                    tokens.push(JSON.stringify(text.slice(lastIndex)));
                }
                return tokens.join('+')
            }

            /*  */

            function transformNode(el, options) {
                var warn = options.warn || baseWarn;
                var staticClass = getAndRemoveAttr(el, 'class');
                if (false) {
                    var expression = parseText(staticClass, options.delimiters);
                    if (expression) {
                        warn(
                            "class=\"" + staticClass + "\": " +
                            'Interpolation inside attributes has been removed. ' +
                            'Use v-bind or the colon shorthand instead. For example, ' +
                            'instead of <div class="{{ val }}">, use <div :class="val">.'
                        );
                    }
                }
                if (staticClass) {
                    el.staticClass = JSON.stringify(staticClass);
                }
                var classBinding = getBindingAttr(el, 'class', false /* getStatic */ );
                if (classBinding) {
                    el.classBinding = classBinding;
                }
            }

            function genData(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 */
                    if (false) {
                        var expression = parseText(staticStyle, options.delimiters);
                        if (expression) {
                            warn(
                                "style=\"" + staticStyle + "\": " +
                                'Interpolation inside attributes has been removed. ' +
                                'Use v-bind or the colon shorthand instead. For example, ' +
                                'instead of <div style="{{ val }}">, use <div :style="val">.'
                            );
                        }
                    }
                    el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
                }

                var styleBinding = getBindingAttr(el, 'style', false /* getStatic */ );
                if (styleBinding) {
                    el.styleBinding = styleBinding;
                }
            }

            function genData$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'
            );

            // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
            // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
            var isNonPhrasingTag = makeMap(
                'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
                'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
                'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
                'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
                'title,tr,track'
            );

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

            /*!
             * HTML Parser By John Resig (ejohn.org)
             * Modified by Juriy "kangax" Zaytsev
             * Original code by Erik Arvidsson, Mozilla Public License
             * http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
             */

            // Regular Expressions for parsing tags and attributes
            var attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
            // could use https://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName
            // but for Vue templates we can enforce a simple charset
            var ncname = '[a-zA-Z_][\\w\\-\\.]*';
            var qnameCapture = "((?:" + ncname + "\\:)?" + ncname + ")";
            var startTagOpen = new RegExp(("^<" + qnameCapture));
            var startTagClose = /^\s*(\/?)>/;
            var endTag = new RegExp(("^<\\/" + qnameCapture + "[^>]*>"));
            var doctype = /^<!DOCTYPE [^>]+>/i;
            var comment = /^<!--/;
            var conditionalComment = /^<!\[/;

            var IS_REGEX_CAPTURING_BROKEN = false;
            'x'.replace(/x(.)?/g, function (m, g) {
                IS_REGEX_CAPTURING_BROKEN = g === '';
            });

            // Special Elements (can contain anything)
            var isPlainTextElement = makeMap('script,style,textarea', true);
            var reCache = {};

            var decodingMap = {
                '&lt;': '<',
                '&gt;': '>',
                '&quot;': '"',
                '&amp;': '&',
                '&#10;': '\n',
                '&#9;': '\t'
            };
            var encodedAttr = /&(?:lt|gt|quot|amp);/g;
            var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#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));
                                    }
                                    advance(commentEnd + 3);
                                    continue
                                }
                            }

                            // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
                            if (conditionalComment.test(html)) {
                                var conditionalEnd = html.indexOf(']>');

                                if (conditionalEnd >= 0) {
                                    advance(conditionalEnd + 2);
                                    continue
                                }
                            }

                            // Doctype:
                            var doctypeMatch = html.match(doctype);
                            if (doctypeMatch) {
                                advance(doctypeMatch[0].length);
                                continue
                            }

                            // End tag:
                            var endTagMatch = html.match(endTag);
                            if (endTagMatch) {
                                var curIndex = index;
                                advance(endTagMatch[0].length);
                                parseEndTag(endTagMatch[1], curIndex, index);
                                continue
                            }

                            // Start tag:
                            var startTagMatch = parseStartTag();
                            if (startTagMatch) {
                                handleStartTag(startTagMatch);
                                if (shouldIgnoreFirstNewline(lastTag, 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);
                            advance(textEnd);
                        }

                        if (textEnd < 0) {
                            text = html;
                            html = '';
                        }

                        if (options.chars && text) {
                            options.chars(text);
                        }
                    } 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')
                                    .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 (false) {
                            options.warn(("Mal-formatted tag at end of template: \"" + html + "\""));
                        }
                        break
                    }
                }

                // Clean up any remaining tags
                parseEndTag();

                function advance(n) {
                    index += n;
                    html = html.substring(n);
                }

                function parseStartTag() {
                    var start = html.match(startTagOpen);
                    if (start) {
                        var match = {
                            tagName: start[1],
                            attrs: [],
                            start: index
                        };
                        advance(start[0].length);
                        var end, attr;
                        while (!(end = html.match(startTagClose)) && (attr = html.match(attribute))) {
                            advance(attr[0].length);
                            match.attrs.push(attr);
                        }
                        if (end) {
                            match.unarySlash = end[1];
                            advance(end[0].length);
                            match.end = index;
                            return match
                        }
                    }
                }

                function handleStartTag(match) {
                    var tagName = match.tagName;
                    var unarySlash = match.unarySlash;

                    if (expectHTML) {
                        if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
                            parseEndTag(lastTag);
                        }
                        if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
                            parseEndTag(tagName);
                        }
                    }

                    var unary = isUnaryTag$$1(tagName) || !!unarySlash;

                    var l = match.attrs.length;
                    var attrs = new Array(l);
                    for (var i = 0; i < l; i++) {
                        var args = match.attrs[i];
                        // hackish work around FF bug https://bugzilla.mozilla.org/show_bug.cgi?id=369778
                        if (IS_REGEX_CAPTURING_BROKEN && args[0].indexOf('""') === -1) {
                            if (args[3] === '') {
                                delete args[3];
                            }
                            if (args[4] === '') {
                                delete args[4];
                            }
                            if (args[5] === '') {
                                delete args[5];
                            }
                        }
                        var value = args[3] || args[4] || args[5] || '';
                        var shouldDecodeNewlines = tagName === 'a' && args[1] === 'href' ?
                            options.shouldDecodeNewlinesForHref :
                            options.shouldDecodeNewlines;
                        attrs[i] = {
                            name: args[1],
                            value: decodeAttr(value, shouldDecodeNewlines)
                        };
                    }

                    if (!unary) {
                        stack.push({
                            tag: tagName,
                            lowerCasedTag: tagName.toLowerCase(),
                            attrs: attrs
                        });
                        lastTag = tagName;
                    }

                    if (options.start) {
                        options.start(tagName, attrs, unary, match.start, match.end);
                    }
                }

                function parseEndTag(tagName, start, end) {
                    var pos, lowerCasedTagName;
                    if (start == null) {
                        start = index;
                    }
                    if (end == null) {
                        end = index;
                    }

                    if (tagName) {
                        lowerCasedTagName = tagName.toLowerCase();
                    }

                    // Find the closest opened tag of the same type
                    if (tagName) {
                        for (pos = stack.length - 1; pos >= 0; pos--) {
                            if (stack[pos].lowerCasedTag === lowerCasedTagName) {
                                break
                            }
                        }
                    } else {
                        // If no tag name is provided, clean shop
                        pos = 0;
                    }

                    if (pos >= 0) {
                        // Close all the open elements, up the stack
                        for (var i = stack.length - 1; i >= pos; i--) {
                            if (false) {
                                options.warn(
                                    ("tag <" + (stack[i].tag) + "> has no matching end tag.")
                                );
                            }
                            if (options.end) {
                                options.end(stack[i].tag, start, end);
                            }
                        }

                        // Remove the open elements from the stack
                        stack.length = pos;
                        lastTag = pos && stack[pos - 1].tag;
                    } else if (lowerCasedTagName === 'br') {
                        if (options.start) {
                            options.start(tagName, [], true, start, end);
                        }
                    } else if (lowerCasedTagName === 'p') {
                        if (options.start) {
                            options.start(tagName, [], false, start, end);
                        }
                        if (options.end) {
                            options.end(tagName, start, end);
                        }
                    }
                }
            }

            /*  */

            var onRE = /^@|^v-on:/;
            var dirRE = /^v-|^@|^:/;
            var forAliasRE = /(.*?)\s+(?:in|of)\s+(.*)/;
            var forIteratorRE = /\((\{[^}]*\}|[^,{]*),([^,]*)(?:,([^,]*))?\)/;
            var stripParensRE = /^\(|\)$/g;

            var argRE = /:(.*)$/;
            var bindRE = /^:|^v-bind:/;
            var modifierRE = /\.[^.]+/g;

            var decodeHTMLCached = cached(he.decode);

            // configurable state
            var warn$2;
            var delimiters;
            var transforms;
            var preTransforms;
            var postTransforms;
            var platformIsPreTag;
            var platformMustUseProp;
            var platformGetTagNamespace;



            function createASTElement(
                tag,
                attrs,
                parent
            ) {
                return {
                    type: 1,
                    tag: tag,
                    attrsList: attrs,
                    attrsMap: makeAttrsMap(attrs),
                    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;

                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 root;
                var currentParent;
                var inVPre = false;
                var inPre = false;
                var warned = false;

                function warnOnce(msg) {
                    if (!warned) {
                        warned = true;
                        warn$2(msg);
                    }
                }

                function endPre(element) {
                    // check pre state
                    if (element.pre) {
                        inVPre = false;
                    }
                    if (platformIsPreTag(element.tag)) {
                        inPre = false;
                    }
                }

                parseHTML(template, {
                    warn: warn$2,
                    expectHTML: options.expectHTML,
                    isUnaryTag: options.isUnaryTag,
                    canBeLeftOpenTag: options.canBeLeftOpenTag,
                    shouldDecodeNewlines: options.shouldDecodeNewlines,
                    shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
                    shouldKeepComment: options.comments,
                    start: function start(tag, attrs, unary) {
                        // check namespace.
                        // inherit parent ns if there is one
                        var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);

                        // handle IE svg bug
                        /* istanbul ignore if */
                        if (isIE && ns === 'svg') {
                            attrs = guardIESVGBug(attrs);
                        }

                        var element = createASTElement(tag, attrs, currentParent);
                        if (ns) {
                            element.ns = ns;
                        }

                        if (isForbiddenTag(element) && !isServerRendering()) {
                            element.forbidden = true;
                            "production" !== 'production' && warn$2(
                                'Templates should only be responsible for mapping the state to the ' +
                                'UI. Avoid placing tags with side-effects in your templates, such as ' +
                                "<" + tag + ">" + ', as they will not be parsed.'
                            );
                        }

                        // apply pre-transforms
                        for (var i = 0; i < preTransforms.length; i++) {
                            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);
                            // element-scope stuff
                            processElement(element, options);
                        }

                        function checkRootConstraints(el) {
                            if (false) {
                                if (el.tag === 'slot' || el.tag === 'template') {
                                    warnOnce(
                                        "Cannot use <" + (el.tag) + "> as component root element because it may " +
                                        'contain multiple nodes.'
                                    );
                                }
                                if (el.attrsMap.hasOwnProperty('v-for')) {
                                    warnOnce(
                                        'Cannot use v-for on stateful component root element because ' +
                                        'it renders multiple elements.'
                                    );
                                }
                            }
                        }

                        // tree management
                        if (!root) {
                            root = element;
                            checkRootConstraints(root);
                        } else if (!stack.length) {
                            // allow root elements with v-if, v-else-if and v-else
                            if (root.if && (element.elseif || element.else)) {
                                checkRootConstraints(element);
                                addIfCondition(root, {
                                    exp: element.elseif,
                                    block: element
                                });
                            } else if (false) {
                                warnOnce(
                                    "Component template should contain exactly one root element. " +
                                    "If you are using v-if on multiple elements, " +
                                    "use v-else-if to chain them instead."
                                );
                            }
                        }
                        if (currentParent && !element.forbidden) {
                            if (element.elseif || element.else) {
                                processIfConditions(element, currentParent);
                            } else if (element.slotScope) { // scoped slot
                                currentParent.plain = false;
                                var name = element.slotTarget || '"default"';
                                (currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
                            } else {
                                currentParent.children.push(element);
                                element.parent = currentParent;
                            }
                        }
                        if (!unary) {
                            currentParent = element;
                            stack.push(element);
                        } else {
                            endPre(element);
                        }
                        // apply post-transforms
                        for (var i$1 = 0; i$1 < postTransforms.length; i$1++) {
                            postTransforms[i$1](element, options);
                        }
                    },

                    end: function end() {
                        // remove trailing whitespace
                        var element = stack[stack.length - 1];
                        var lastNode = element.children[element.children.length - 1];
                        if (lastNode && lastNode.type === 3 && lastNode.text === ' ' && !inPre) {
                            element.children.pop();
                        }
                        // pop stack
                        stack.length -= 1;
                        currentParent = stack[stack.length - 1];
                        endPre(element);
                    },

                    chars: function chars(text) {
                        if (!currentParent) {
                            if (false) {
                                if (text === template) {
                                    warnOnce(
                                        'Component template requires a root element, rather than just text.'
                                    );
                                } else if ((text = text.trim())) {
                                    warnOnce(
                                        ("text \"" + text + "\" outside root element will be ignored.")
                                    );
                                }
                            }
                            return
                        }
                        // IE textarea placeholder bug
                        /* istanbul ignore if */
                        if (isIE &&
                            currentParent.tag === 'textarea' &&
                            currentParent.attrsMap.placeholder === text
                        ) {
                            return
                        }
                        var children = currentParent.children;
                        text = inPre || text.trim() ?
                            isTextTag(currentParent) ? text : decodeHTMLCached(text)
                            // only preserve whitespace if its not right after a starting tag
                            :
                            preserveWhitespace && children.length ? ' ' : '';
                        if (text) {
                            var expression;
                            if (!inVPre && text !== ' ' && (expression = parseText(text, delimiters))) {
                                children.push({
                                    type: 2,
                                    expression: expression,
                                    text: text
                                });
                            } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
                                children.push({
                                    type: 3,
                                    text: text
                                });
                            }
                        }
                    },
                    comment: function comment(text) {
                        currentParent.children.push({
                            type: 3,
                            text: text,
                            isComment: true
                        });
                    }
                });
                return root
            }

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

            function processRawAttrs(el) {
                var l = el.attrsList.length;
                if (l) {
                    var attrs = el.attrs = new Array(l);
                    for (var i = 0; i < l; i++) {
                        attrs[i] = {
                            name: el.attrsList[i].name,
                            value: JSON.stringify(el.attrsList[i].value)
                        };
                    }
                } else if (!el.pre) {
                    // non root node in pre blocks with no attributes
                    el.plain = true;
                }
            }

            function processElement(element, options) {
                processKey(element);

                // determine whether this is a plain element after
                // removing structural attributes
                element.plain = !element.key && !element.attrsList.length;

                processRef(element);
                processSlot(element);
                processComponent(element);
                for (var i = 0; i < transforms.length; i++) {
                    element = transforms[i](element, options) || element;
                }
                processAttrs(element);
            }

            function processKey(el) {
                var exp = getBindingAttr(el, 'key');
                if (exp) {
                    if (false) {
                        warn$2("<template> cannot be keyed. Place the key on real elements instead.");
                    }
                    el.key = exp;
                }
            }

            function processRef(el) {
                var ref = getBindingAttr(el, 'ref');
                if (ref) {
                    el.ref = ref;
                    el.refInFor = checkInFor(el);
                }
            }

            function processFor(el) {
                var exp;
                if ((exp = getAndRemoveAttr(el, 'v-for'))) {
                    var inMatch = exp.match(forAliasRE);
                    if (!inMatch) {
                        "production" !== 'production' && warn$2(
                            ("Invalid v-for expression: " + exp)
                        );
                        return
                    }
                    el.for = inMatch[2].trim();
                    var alias = inMatch[1].trim();
                    var iteratorMatch = alias.match(forIteratorRE);
                    if (iteratorMatch) {
                        el.alias = iteratorMatch[1].trim();
                        el.iterator1 = iteratorMatch[2].trim();
                        if (iteratorMatch[3]) {
                            el.iterator2 = iteratorMatch[3].trim();
                        }
                    } else {
                        el.alias = alias.replace(stripParensRE, '');
                    }
                }
            }

            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 if (false) {
                    warn$2(
                        "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
                        "used on element <" + (el.tag) + "> without corresponding v-if."
                    );
                }
            }

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

            function addIfCondition(el, condition) {
                if (!el.ifConditions) {
                    el.ifConditions = [];
                }
                el.ifConditions.push(condition);
            }

            function processOnce(el) {
                var once$$1 = getAndRemoveAttr(el, 'v-once');
                if (once$$1 != null) {
                    el.once = true;
                }
            }

            function processSlot(el) {
                if (el.tag === 'slot') {
                    el.slotName = getBindingAttr(el, 'name');
                    if (false) {
                        warn$2(
                            "`key` does not work on <slot> because slots are abstract outlets " +
                            "and can possibly expand into multiple elements. " +
                            "Use the key on a wrapping element instead."
                        );
                    }
                } else {
                    var slotScope;
                    if (el.tag === 'template') {
                        slotScope = getAndRemoveAttr(el, 'scope');
                        /* istanbul ignore if */
                        if (false) {
                            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.",
                                true
                            );
                        }
                        el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
                    } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
                        /* istanbul ignore if */
                        if (false) {
                            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.",
                                true
                            );
                        }
                        el.slotScope = slotScope;
                    }
                    var slotTarget = getBindingAttr(el, 'slot');
                    if (slotTarget) {
                        el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
                        // 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);
                        }
                    }
                }
            }

            function processComponent(el) {
                var binding;
                if ((binding = getBindingAttr(el, 'is'))) {
                    el.component = binding;
                }
                if (getAndRemoveAttr(el, 'inline-template') != null) {
                    el.inlineTemplate = true;
                }
            }

            function processAttrs(el) {
                var list = el.attrsList;
                var i, l, name, rawName, value, modifiers, isProp;
                for (i = 0, l = list.length; i < l; i++) {
                    name = rawName = list[i].name;
                    value = list[i].value;
                    if (dirRE.test(name)) {
                        // mark element as dynamic
                        el.hasBindings = true;
                        // modifiers
                        modifiers = parseModifiers(name);
                        if (modifiers) {
                            name = name.replace(modifierRE, '');
                        }
                        if (bindRE.test(name)) { // v-bind
                            name = name.replace(bindRE, '');
                            value = parseFilters(value);
                            isProp = false;
                            if (modifiers) {
                                if (modifiers.prop) {
                                    isProp = true;
                                    name = camelize(name);
                                    if (name === 'innerHtml') {
                                        name = 'innerHTML';
                                    }
                                }
                                if (modifiers.camel) {
                                    name = camelize(name);
                                }
                                if (modifiers.sync) {
                                    addHandler(
                                        el,
                                        ("update:" + (camelize(name))),
                                        genAssignmentCode(value, "$event")
                                    );
                                }
                            }
                            if (isProp || (!el.component && platformMustUseProp(el.tag, el.attrsMap.type, name))) {
                                addProp(el, name, value);
                            } else {
                                addAttr(el, name, value);
                            }
                        } else if (onRE.test(name)) { // v-on
                            name = name.replace(onRE, '');
                            addHandler(el, name, value, modifiers, false, warn$2);
                        } else { // normal directives
                            name = name.replace(dirRE, '');
                            // parse arg
                            var argMatch = name.match(argRE);
                            var arg = argMatch && argMatch[1];
                            if (arg) {
                                name = name.slice(0, -(arg.length + 1));
                            }
                            addDirective(el, name, rawName, value, arg, modifiers);
                            if (false) {
                                checkForAliasModel(el, value);
                            }
                        }
                    } else {
                        // literal attribute
                        if (false) {
                            var expression = parseText(value, delimiters);
                            if (expression) {
                                warn$2(
                                    name + "=\"" + value + "\": " +
                                    'Interpolation inside attributes has been removed. ' +
                                    'Use v-bind or the colon shorthand instead. For example, ' +
                                    'instead of <div id="{{ val }}">, use <div :id="val">.'
                                );
                            }
                        }
                        addAttr(el, name, JSON.stringify(value));
                        // #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');
                        }
                    }
                }
            }

            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 (
                        false
                    ) {
                        warn$2('duplicate attribute: ' + attrs[i].name);
                    }
                    map[attrs[i].name] = attrs[i].value;
                }
                return map
            }

            // for script (e.g. type="x/template") or style, do not decode content
            function isTextTag(el) {
                return el.tag === 'script' || el.tag === 'style'
            }

            function isForbiddenTag(el) {
                return (
                    el.tag === 'style' ||
                    (el.tag === 'script' && (!el.attrsMap.type ||
                        el.attrsMap.type === 'text/javascript'
                    ))
                )
            }

            var ieNSBug = /^xmlns:NS\d+/;
            var ieNSPrefix = /^NS\d+:/;

            /* istanbul ignore next */
            function guardIESVGBug(attrs) {
                var res = [];
                for (var i = 0; i < attrs.length; i++) {
                    var attr = attrs[i];
                    if (!ieNSBug.test(attr.name)) {
                        attr.name = attr.name.replace(ieNSPrefix, '');
                        res.push(attr);
                    }
                }
                return res
            }

            function checkForAliasModel(el, value) {
                var _el = el;
                while (_el) {
                    if (_el.for && _el.alias === value) {
                        warn$2(
                            "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                            "You are binding v-model directly to a v-for iteration alias. " +
                            "This will not be able to modify the v-for source array because " +
                            "writing to the alias is like modifying a function local variable. " +
                            "Consider using an array of objects and use v-model on an object property instead."
                        );
                    }
                    _el = _el.parent;
                }
            }

            /*  */

            /**
             * Expand input[v-model] with dyanmic type bindings into v-if-else chains
             * Turn this:
             *   <input v-model="data[type]" :type="type">
             * into this:
             *   <input v-if="type === 'checkbox'" type="checkbox" v-model="data[type]">
             *   <input v-else-if="type === 'radio'" type="radio" v-model="data[type]">
             *   <input v-else :type="type" v-model="data[type]">
             */

            function preTransformNode(el, options) {
                if (el.tag === 'input') {
                    var map = el.attrsMap;
                    if (map['v-model'] && (map['v-bind:type'] || map[':type'])) {
                        var typeBinding = getBindingAttr(el, 'type');
                        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)
            }

            function addRawAttr(el, name, value) {
                el.attrsMap[name] = value;
                el.attrsList.push({
                    name: name,
                    value: value
                });
            }

            var model$2 = {
                preTransformNode: preTransformNode
            };

            var modules$1 = [
                klass$1,
                style$1,
                model$2
            ];

            /*  */

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

            /*  */

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

            var directives$1 = {
                model: model,
                text: text,
                html: html
            };

            /*  */

            var baseOptions = {
                expectHTML: true,
                modules: modules$1,
                directives: directives$1,
                isPreTag: isPreTag,
                isUnaryTag: isUnaryTag,
                mustUseProp: mustUseProp,
                canBeLeftOpenTag: canBeLeftOpenTag,
                isReservedTag: isReservedTag,
                getTagNamespace: getTagNamespace,
                staticKeys: genStaticKeys(modules$1)
            };

            /*  */

            var isStaticKey;
            var isPlatformReservedTag;

            var genStaticKeysCached = cached(genStaticKeys$1);

            /**
             * Goal of the optimizer: walk the generated template AST tree
             * and detect sub-trees that are purely static, i.e. parts of
             * the DOM that never needs to change.
             *
             * Once we detect these sub-trees, we can:
             *
             * 1. Hoist them into constants, so that we no longer need to
             *    create fresh nodes for them on each re-render;
             * 2. Completely skip them in the patching process.
             */
            function optimize(root, options) {
                if (!root) {
                    return
                }
                isStaticKey = genStaticKeysCached(options.staticKeys || '');
                isPlatformReservedTag = options.isReservedTag || no;
                // first pass: mark all non-static nodes.
                markStatic$1(root);
                // second pass: mark static roots.
                markStaticRoots(root, false);
            }

            function genStaticKeys$1(keys) {
                return makeMap(
                    'type,tag,attrsList,attrsMap,plain,parent,children,attrs' +
                    (keys ? ',' + keys : '')
                )
            }

            function markStatic$1(node) {
                node.static = isStatic(node);
                if (node.type === 1) {
                    // do not make component slot content static. this avoids
                    // 1. components not able to mutate slot nodes
                    // 2. static slot content fails for hot-reloading
                    if (!isPlatformReservedTag(node.tag) &&
                        node.tag !== 'slot' &&
                        node.attrsMap['inline-template'] == null
                    ) {
                        return
                    }
                    for (var i = 0, l = node.children.length; i < l; i++) {
                        var child = node.children[i];
                        markStatic$1(child);
                        if (!child.static) {
                            node.static = false;
                        }
                    }
                    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 = /^\s*([\w$_]+|\([^)]*?\))\s*=>|^function\s*\(/;
            var simplePathRE = /^\s*[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['.*?']|\[".*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*\s*$/;

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

            // #4868: modifiers that prevent the execution of the listener
            // need to explicitly return null so that we can determine whether to remove
            // the listener for .once
            var genGuard = function (condition) {
                return ("if(" + condition + ")return null;");
            };

            var modifierCode = {
                stop: '$event.stopPropagation();',
                prevent: '$event.preventDefault();',
                self: genGuard("$event.target !== $event.currentTarget"),
                ctrl: genGuard("!$event.ctrlKey"),
                shift: genGuard("!$event.shiftKey"),
                alt: genGuard("!$event.altKey"),
                meta: genGuard("!$event.metaKey"),
                left: genGuard("'button' in $event && $event.button !== 0"),
                middle: genGuard("'button' in $event && $event.button !== 1"),
                right: genGuard("'button' in $event && $event.button !== 2")
            };

            function genHandlers(
                events,
                isNative,
                warn
            ) {
                var res = isNative ? 'nativeOn:{' : 'on:{';
                for (var name in events) {
                    res += "\"" + name + "\":" + (genHandler(name, events[name])) + ",";
                }
                return res.slice(0, -1) + '}'
            }

            function genHandler(
                name,
                handler
            ) {
                if (!handler) {
                    return 'function(){}'
                }

                if (Array.isArray(handler)) {
                    return ("[" + (handler.map(function (handler) {
                        return genHandler(name, handler);
                    }).join(',')) + "]")
                }

                var isMethodPath = simplePathRE.test(handler.value);
                var isFunctionExpression = fnExpRE.test(handler.value);

                if (!handler.modifiers) {
                    return isMethodPath || isFunctionExpression ?
                        handler.value :
                        ("function($event){" + (handler.value) + "}") // inline statement
                } else {
                    var code = '';
                    var genModifierCode = '';
                    var keys = [];
                    for (var key in handler.modifiers) {
                        if (modifierCode[key]) {
                            genModifierCode += modifierCode[key];
                            // left/right
                            if (keyCodes[key]) {
                                keys.push(key);
                            }
                        } else if (key === 'exact') {
                            var modifiers = (handler.modifiers);
                            genModifierCode += genGuard(
                                ['ctrl', 'shift', 'alt', 'meta']
                                .filter(function (keyModifier) {
                                    return !modifiers[keyModifier];
                                })
                                .map(function (keyModifier) {
                                    return ("$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 ?
                        handler.value + '($event)' :
                        isFunctionExpression ?
                        ("(" + (handler.value) + ")($event)") :
                        handler.value;
                    return ("function($event){" + code + handlerCode + "}")
                }
            }

            function genKeyFilter(keys) {
                return ("if(!('button' in $event)&&" + (keys.map(genFilterCode).join('&&')) + ")return null;")
            }

            function genFilterCode(key) {
                var keyVal = parseInt(key, 10);
                if (keyVal) {
                    return ("$event.keyCode!==" + keyVal)
                }
                var code = keyCodes[key];
                return (
                    "_k($event.keyCode," +
                    (JSON.stringify(key)) + "," +
                    (JSON.stringify(code)) + "," +
                    "$event.key)"
                )
            }

            /*  */

            function on(el, dir) {
                if (false) {
                    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 !isReservedTag(el.tag);
                };
                this.onceId = 0;
                this.staticRenderFns = [];
            };



            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.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) {
                    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 = el.plain ? undefined : 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, once$$1) {
                el.staticProcessed = true;
                state.staticRenderFns.push(("with(this){return " + (genElement(el, state)) + "}"));
                return ("_m(" + (state.staticRenderFns.length - 1) + "," + (el.staticInFor ? 'true' : 'false') + "," + (once$$1 ? 'true' : 'false') + ")")
            }

            // 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) {
                        "production" !== 'production' && state.warn(
                            "v-once can only be used inside v-for that is keyed. "
                        );
                        return genElement(el, state)
                    }
                    return ("_o(" + (genElement(el, state)) + "," + (state.onceId++) + "," + key + ")")
                } else {
                    return genStatic(el, state, true)
                }
            }

            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 (false) {
                    state.warn(
                        "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
                        "v-for should have explicit keys. " +
                        "See https://vuejs.org/guide/list.html#key for more info.",
                        true /* tip */
                    );
                }

                el.forProcessed = true; // avoid recursion
                return (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, state.warn)) + ",";
                }
                if (el.nativeEvents) {
                    data += (genHandlers(el.nativeEvents, true, state.warn)) + ",";
                }
                // slot target
                // only for non-scoped slots
                if (el.slotTarget && !el.slotScope) {
                    data += "slot:" + (el.slotTarget) + ",";
                }
                // scoped slots
                if (el.scopedSlots) {
                    data += (genScopedSlots(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 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.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 (false) {
                    state.warn('Inline-template components must have exactly one child element.');
                }
                if (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(
                slots,
                state
            ) {
                return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) {
                    return genScopedSlot(key, slots[key], state)
                }).join(',')) + "])")
            }

            function genScopedSlot(
                key,
                el,
                state
            ) {
                if (el.for && !el.forProcessed) {
                    return genForScopedSlot(key, el, state)
                }
                var fn = "function(" + (String(el.slotScope)) + "){" +
                    "return " + (el.tag === 'template' ?
                        el.if ?
                        ((el.if) + "?" + (genChildren(el, state) || 'undefined') + ":undefined") :
                        genChildren(el, state) || 'undefined' :
                        genElement(el, state)) + "}";
                return ("{key:" + key + ",fn:" + fn + "}")
            }

            function genForScopedSlot(
                key,
                el,
                state
            ) {
                var exp = el.for;
                var alias = el.alias;
                var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
                var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
                el.forProcessed = true; // avoid recursion
                return "_l((" + exp + ")," +
                    "function(" + alias + iterator1 + iterator2 + "){" +
                    "return " + (genScopedSlot(key, el, state)) +
                    '})'
            }

            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'
                    ) {
                        return (altGenElement || genElement)(el$1, state)
                    }
                    var normalizationType = checkSkip ?
                        getNormalizationType(children, state.maybeComponent) :
                        0;
                    var gen = altGenNode || genNode;
                    return ("[" + (children.map(function (c) {
                        return gen(c, state);
                    }).join(',')) + "]" + (normalizationType ? ("," + normalizationType) : ''))
                }
            }

            // determine the normalization needed for the children array.
            // 0: no normalization needed
            // 1: simple normalization needed (possible 1-level deep nested array)
            // 2: full normalization needed
            function getNormalizationType(
                children,
                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)
                }
                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.attrs.map(function (a) {
                    return ((camelize(a.name)) + ":" + (a.value));
                }).join(',')) + "}");
                var bind$$1 = el.attrsMap['v-bind'];
                if ((attrs || bind$$1) && !children) {
                    res += ",null";
                }
                if (attrs) {
                    res += "," + attrs;
                }
                if (bind$$1) {
                    res += (attrs ? '' : ',null') + "," + bind$$1;
                }
                return res + ')'
            }

            // componentName is el.component, take it as argument to shun flow's pessimistic refinement
            function genComponent(
                componentName,
                el,
                state
            ) {
                var children = el.inlineTemplate ? null : genChildren(el, state, true);
                return ("_c(" + componentName + "," + (genData$2(el, state)) + (children ? ("," + children) : '') + ")")
            }

            function genProps(props) {
                var res = '';
                for (var i = 0; i < props.length; i++) {
                    var prop = props[i];
                    res += "\"" + (prop.name) + "\":" + (transformSpecialNewlines(prop.value)) + ",";
                }
                return res.slice(0, -1)
            }

            // #3895, #4268
            function transformSpecialNewlines(text) {
                return text
                    .replace(/\u2028/g, '\\u2028')
                    .replace(/\u2029/g, '\\u2029')
            }

            /*  */

            // these keywords should not appear inside expressions, but operators like
            // typeof, instanceof and in are allowed
            var prohibitedKeywordRE = new RegExp('\\b' + (
                'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
                'super,throw,while,yield,delete,export,import,return,switch,default,' +
                'extends,finally,continue,debugger,function,arguments'
            ).split(',').join('\\b|\\b') + '\\b');

            // these unary operators should not be used as property/method names
            var unaryOperatorsRE = new RegExp('\\b' + (
                'delete,typeof,void'
            ).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');

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

            // detect problematic expressions in a template
            function detectErrors(ast) {
                var errors = [];
                if (ast) {
                    checkNode(ast, errors);
                }
                return errors
            }

            function checkNode(node, errors) {
                if (node.type === 1) {
                    for (var name in node.attrsMap) {
                        if (dirRE.test(name)) {
                            var value = node.attrsMap[name];
                            if (value) {
                                if (name === 'v-for') {
                                    checkFor(node, ("v-for=\"" + value + "\""), errors);
                                } else if (onRE.test(name)) {
                                    checkEvent(value, (name + "=\"" + value + "\""), errors);
                                } else {
                                    checkExpression(value, (name + "=\"" + value + "\""), errors);
                                }
                            }
                        }
                    }
                    if (node.children) {
                        for (var i = 0; i < node.children.length; i++) {
                            checkNode(node.children[i], errors);
                        }
                    }
                } else if (node.type === 2) {
                    checkExpression(node.expression, node.text, errors);
                }
            }

            function checkEvent(exp, text, errors) {
                var stipped = exp.replace(stripStringRE, '');
                var keywordMatch = stipped.match(unaryOperatorsRE);
                if (keywordMatch && stipped.charAt(keywordMatch.index - 1) !== '$') {
                    errors.push(
                        "avoid using JavaScript unary operator as property name: " +
                        "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim())
                    );
                }
                checkExpression(exp, text, errors);
            }

            function checkFor(node, text, errors) {
                checkExpression(node.for || '', text, errors);
                checkIdentifier(node.alias, 'v-for alias', text, errors);
                checkIdentifier(node.iterator1, 'v-for iterator', text, errors);
                checkIdentifier(node.iterator2, 'v-for iterator', text, errors);
            }

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

            function checkExpression(exp, text, errors) {
                try {
                    new Function(("return " + exp));
                } catch (e) {
                    var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
                    if (keywordMatch) {
                        errors.push(
                            "avoid using JavaScript keyword as property name: " +
                            "\"" + (keywordMatch[0]) + "\"\n  Raw expression: " + (text.trim())
                        );
                    } else {
                        errors.push(
                            "invalid expression: " + (e.message) + " in\n\n" +
                            "    " + exp + "\n\n" +
                            "  Raw expression: " + (text.trim()) + "\n"
                        );
                    }
                }
            }

            /*  */

            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 */
                    if (false) {
                        // 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 (false) {
                        if (compiled.errors && compiled.errors.length) {
                            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) {
                            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 (false) {
                        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 = [];
                        finalOptions.warn = function (msg, tip) {
                            (tip ? tips : errors).push(msg);
                        };

                        if (options) {
                            // merge custom modules
                            if (options.modules) {
                                finalOptions.modules =
                                    (baseOptions.modules || []).concat(options.modules);
                            }
                            // merge custom directives
                            if (options.directives) {
                                finalOptions.directives = extend(
                                    Object.create(baseOptions.directives),
                                    options.directives
                                );
                            }
                            // copy other options
                            for (var key in options) {
                                if (key !== 'modules' && key !== 'directives') {
                                    finalOptions[key] = options[key];
                                }
                            }
                        }

                        var compiled = baseCompile(template, finalOptions);
                        if (false) {
                            errors.push.apply(errors, detectErrors(compiled.ast));
                        }
                        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);
                optimize(ast, options);
                var code = generate(ast, options);
                return {
                    ast: ast,
                    render: code.render,
                    staticRenderFns: code.staticRenderFns
                }
            });

            /*  */

            var ref$1 = createCompiler(baseOptions);
            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$3.prototype.$mount;
            Vue$3.prototype.$mount = function (
                el,
                hydrating
            ) {
                el = el && query(el);

                /* istanbul ignore if */
                if (el === document.body || el === document.documentElement) {
                    "production" !== 'production' && warn(
                        "Do not mount Vue to <html> or <body> - mount to normal elements instead."
                    );
                    return this
                }

                var options = this.$options;
                // resolve template/el and convert to render function
                if (!options.render) {
                    var template = options.template;
                    if (template) {
                        if (typeof template === 'string') {
                            if (template.charAt(0) === '#') {
                                template = idToTemplate(template);
                                /* istanbul ignore if */
                                if (false) {
                                    warn(
                                        ("Template element not found or is empty: " + (options.template)),
                                        this
                                    );
                                }
                            }
                        } else if (template.nodeType) {
                            template = template.innerHTML;
                        } else {
                            if (false) {
                                warn('invalid template option:' + template, this);
                            }
                            return this
                        }
                    } else if (el) {
                        template = getOuterHTML(el);
                    }
                    if (template) {
                        /* istanbul ignore if */
                        if (false) {
                            mark('compile');
                        }

                        var ref = compileToFunctions(template, {
                            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 (false) {
                            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$3.compile = compileToFunctions;

            /* harmony default export */
            __webpack_exports__["a"] = (Vue$3);

            /* WEBPACK VAR INJECTION */
        }.call(__webpack_exports__, __webpack_require__(0), __webpack_require__(3).setImmediate))

        /***/
    }),
    /* 3 */
    /***/
    (function (module, exports, __webpack_require__) {

        var apply = Function.prototype.apply;

        // DOM APIs, for completeness

        exports.setTimeout = function () {
            return new Timeout(apply.call(setTimeout, window, arguments), clearTimeout);
        };
        exports.setInterval = function () {
            return new Timeout(apply.call(setInterval, window, arguments), clearInterval);
        };
        exports.clearTimeout =
            exports.clearInterval = function (timeout) {
                if (timeout) {
                    timeout.close();
                }
            };

        function Timeout(id, clearFn) {
            this._id = id;
            this._clearFn = clearFn;
        }
        Timeout.prototype.unref = Timeout.prototype.ref = function () {};
        Timeout.prototype.close = function () {
            this._clearFn.call(window, this._id);
        };

        // Does not start the time, just sets up the members needed.
        exports.enroll = function (item, msecs) {
            clearTimeout(item._idleTimeoutId);
            item._idleTimeout = msecs;
        };

        exports.unenroll = function (item) {
            clearTimeout(item._idleTimeoutId);
            item._idleTimeout = -1;
        };

        exports._unrefActive = exports.active = function (item) {
            clearTimeout(item._idleTimeoutId);

            var msecs = item._idleTimeout;
            if (msecs >= 0) {
                item._idleTimeoutId = setTimeout(function onTimeout() {
                    if (item._onTimeout)
                        item._onTimeout();
                }, msecs);
            }
        };

        // setimmediate attaches itself to the global object
        __webpack_require__(4);
        exports.setImmediate = setImmediate;
        exports.clearImmediate = clearImmediate;


        /***/
    }),
    /* 4 */
    /***/
    (function (module, exports, __webpack_require__) {

        /* WEBPACK VAR INJECTION */
        (function (global, process) {
            (function (global, undefined) {
                "use strict";

                if (global.setImmediate) {
                    return;
                }

                var nextHandle = 1; // Spec says greater than zero
                var tasksByHandle = {};
                var currentlyRunningATask = false;
                var doc = global.document;
                var registerImmediate;

                function setImmediate(callback) {
                    // Callback can either be a function or a string
                    if (typeof callback !== "function") {
                        callback = new Function("" + callback);
                    }
                    // Copy function arguments
                    var args = new Array(arguments.length - 1);
                    for (var i = 0; i < args.length; i++) {
                        args[i] = arguments[i + 1];
                    }
                    // Store and register the task
                    var task = {
                        callback: callback,
                        args: args
                    };
                    tasksByHandle[nextHandle] = task;
                    registerImmediate(nextHandle);
                    return nextHandle++;
                }

                function clearImmediate(handle) {
                    delete tasksByHandle[handle];
                }

                function run(task) {
                    var callback = task.callback;
                    var args = task.args;
                    switch (args.length) {
                        case 0:
                            callback();
                            break;
                        case 1:
                            callback(args[0]);
                            break;
                        case 2:
                            callback(args[0], args[1]);
                            break;
                        case 3:
                            callback(args[0], args[1], args[2]);
                            break;
                        default:
                            callback.apply(undefined, args);
                            break;
                    }
                }

                function runIfPresent(handle) {
                    // From the spec: "Wait until any invocations of this algorithm started before this one have completed."
                    // So if we're currently running a task, we'll need to delay this invocation.
                    if (currentlyRunningATask) {
                        // Delay by doing a setTimeout. setImmediate was tried instead, but in Firefox 7 it generated a
                        // "too much recursion" error.
                        setTimeout(runIfPresent, 0, handle);
                    } else {
                        var task = tasksByHandle[handle];
                        if (task) {
                            currentlyRunningATask = true;
                            try {
                                run(task);
                            } finally {
                                clearImmediate(handle);
                                currentlyRunningATask = false;
                            }
                        }
                    }
                }

                function installNextTickImplementation() {
                    registerImmediate = function (handle) {
                        process.nextTick(function () {
                            runIfPresent(handle);
                        });
                    };
                }

                function canUsePostMessage() {
                    // The test against `importScripts` prevents this implementation from being installed inside a web worker,
                    // where `global.postMessage` means something completely different and can't be used for this purpose.
                    if (global.postMessage && !global.importScripts) {
                        var postMessageIsAsynchronous = true;
                        var oldOnMessage = global.onmessage;
                        global.onmessage = function () {
                            postMessageIsAsynchronous = false;
                        };
                        global.postMessage("", "*");
                        global.onmessage = oldOnMessage;
                        return postMessageIsAsynchronous;
                    }
                }

                function installPostMessageImplementation() {
                    // Installs an event handler on `global` for the `message` event: see
                    // * https://developer.mozilla.org/en/DOM/window.postMessage
                    // * http://www.whatwg.org/specs/web-apps/current-work/multipage/comms.html#crossDocumentMessages

                    var messagePrefix = "setImmediate$" + Math.random() + "$";
                    var onGlobalMessage = function (event) {
                        if (event.source === global &&
                            typeof event.data === "string" &&
                            event.data.indexOf(messagePrefix) === 0) {
                            runIfPresent(+event.data.slice(messagePrefix.length));
                        }
                    };

                    if (global.addEventListener) {
                        global.addEventListener("message", onGlobalMessage, false);
                    } else {
                        global.attachEvent("onmessage", onGlobalMessage);
                    }

                    registerImmediate = function (handle) {
                        global.postMessage(messagePrefix + handle, "*");
                    };
                }

                function installMessageChannelImplementation() {
                    var channel = new MessageChannel();
                    channel.port1.onmessage = function (event) {
                        var handle = event.data;
                        runIfPresent(handle);
                    };

                    registerImmediate = function (handle) {
                        channel.port2.postMessage(handle);
                    };
                }

                function installReadyStateChangeImplementation() {
                    var html = doc.documentElement;
                    registerImmediate = function (handle) {
                        // Create a <script> element; its readystatechange event will be fired asynchronously once it is inserted
                        // into the document. Do so, thus queuing up the task. Remember to clean up once it's been called.
                        var script = doc.createElement("script");
                        script.onreadystatechange = function () {
                            runIfPresent(handle);
                            script.onreadystatechange = null;
                            html.removeChild(script);
                            script = null;
                        };
                        html.appendChild(script);
                    };
                }

                function installSetTimeoutImplementation() {
                    registerImmediate = function (handle) {
                        setTimeout(runIfPresent, 0, handle);
                    };
                }

                // If supported, we should attach to the prototype of global, since that is where setTimeout et al. live.
                var attachTo = Object.getPrototypeOf && Object.getPrototypeOf(global);
                attachTo = attachTo && attachTo.setTimeout ? attachTo : global;

                // Don't get fooled by e.g. browserify environments.
                if ({}.toString.call(global.process) === "[object process]") {
                    // For Node.js before 0.9
                    installNextTickImplementation();

                } else if (canUsePostMessage()) {
                    // For non-IE10 modern browsers
                    installPostMessageImplementation();

                } else if (global.MessageChannel) {
                    // For web workers, where supported
                    installMessageChannelImplementation();

                } else if (doc && "onreadystatechange" in doc.createElement("script")) {
                    // For IE 6–8
                    installReadyStateChangeImplementation();

                } else {
                    // For older browsers
                    installSetTimeoutImplementation();
                }

                attachTo.setImmediate = setImmediate;
                attachTo.clearImmediate = clearImmediate;
            }(typeof self === "undefined" ? typeof global === "undefined" ? this : global : self));

            /* WEBPACK VAR INJECTION */
        }.call(exports, __webpack_require__(0), __webpack_require__(5)))

        /***/
    }),
    /* 5 */
    /***/
    (function (module, exports) {

        // shim for using process in browser
        var process = module.exports = {};

        // cached from whatever global is present so that test runners that stub it
        // don't break things.  But we need to wrap it in a try catch in case it is
        // wrapped in strict mode code which doesn't define any globals.  It's inside a
        // function because try/catches deoptimize in certain engines.

        var cachedSetTimeout;
        var cachedClearTimeout;

        function defaultSetTimout() {
            throw new Error('setTimeout has not been defined');
        }

        function defaultClearTimeout() {
            throw new Error('clearTimeout has not been defined');
        }
        (function () {
            try {
                if (typeof setTimeout === 'function') {
                    cachedSetTimeout = setTimeout;
                } else {
                    cachedSetTimeout = defaultSetTimout;
                }
            } catch (e) {
                cachedSetTimeout = defaultSetTimout;
            }
            try {
                if (typeof clearTimeout === 'function') {
                    cachedClearTimeout = clearTimeout;
                } else {
                    cachedClearTimeout = defaultClearTimeout;
                }
            } catch (e) {
                cachedClearTimeout = defaultClearTimeout;
            }
        }())

        function runTimeout(fun) {
            if (cachedSetTimeout === setTimeout) {
                //normal enviroments in sane situations
                return setTimeout(fun, 0);
            }
            // if setTimeout wasn't available but was latter defined
            if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
                cachedSetTimeout = setTimeout;
                return setTimeout(fun, 0);
            }
            try {
                // when when somebody has screwed with setTimeout but no I.E. maddness
                return cachedSetTimeout(fun, 0);
            } catch (e) {
                try {
                    // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
                    return cachedSetTimeout.call(null, fun, 0);
                } catch (e) {
                    // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
                    return cachedSetTimeout.call(this, fun, 0);
                }
            }


        }

        function runClearTimeout(marker) {
            if (cachedClearTimeout === clearTimeout) {
                //normal enviroments in sane situations
                return clearTimeout(marker);
            }
            // if clearTimeout wasn't available but was latter defined
            if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
                cachedClearTimeout = clearTimeout;
                return clearTimeout(marker);
            }
            try {
                // when when somebody has screwed with setTimeout but no I.E. maddness
                return cachedClearTimeout(marker);
            } catch (e) {
                try {
                    // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
                    return cachedClearTimeout.call(null, marker);
                } catch (e) {
                    // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
                    // Some versions of I.E. have different rules for clearTimeout vs setTimeout
                    return cachedClearTimeout.call(this, marker);
                }
            }



        }
        var queue = [];
        var draining = false;
        var currentQueue;
        var queueIndex = -1;

        function cleanUpNextTick() {
            if (!draining || !currentQueue) {
                return;
            }
            draining = false;
            if (currentQueue.length) {
                queue = currentQueue.concat(queue);
            } else {
                queueIndex = -1;
            }
            if (queue.length) {
                drainQueue();
            }
        }

        function drainQueue() {
            if (draining) {
                return;
            }
            var timeout = runTimeout(cleanUpNextTick);
            draining = true;

            var len = queue.length;
            while (len) {
                currentQueue = queue;
                queue = [];
                while (++queueIndex < len) {
                    if (currentQueue) {
                        currentQueue[queueIndex].run();
                    }
                }
                queueIndex = -1;
                len = queue.length;
            }
            currentQueue = null;
            draining = false;
            runClearTimeout(timeout);
        }

        process.nextTick = function (fun) {
            var args = new Array(arguments.length - 1);
            if (arguments.length > 1) {
                for (var i = 1; i < arguments.length; i++) {
                    args[i - 1] = arguments[i];
                }
            }
            queue.push(new Item(fun, args));
            if (queue.length === 1 && !draining) {
                runTimeout(drainQueue);
            }
        };

        // v8 likes predictible objects
        function Item(fun, array) {
            this.fun = fun;
            this.array = array;
        }
        Item.prototype.run = function () {
            this.fun.apply(null, this.array);
        };
        process.title = 'browser';
        process.browser = true;
        process.env = {};
        process.argv = [];
        process.version = ''; // empty string to avoid regexp issues
        process.versions = {};

        function noop() {}

        process.on = noop;
        process.addListener = noop;
        process.once = noop;
        process.off = noop;
        process.removeListener = noop;
        process.removeAllListeners = noop;
        process.emit = noop;
        process.prependListener = noop;
        process.prependOnceListener = noop;

        process.listeners = function (name) {
            return []
        }

        process.binding = function (name) {
            throw new Error('process.binding is not supported');
        };

        process.cwd = function () {
            return '/'
        };
        process.chdir = function (dir) {
            throw new Error('process.chdir is not supported');
        };
        process.umask = function () {
            return 0;
        };


        /***/
    }),
    /* 6 */
    /***/
    (function (module, __webpack_exports__, __webpack_require__) {

        "use strict";
        /* harmony import */
        var __WEBPACK_IMPORTED_MODULE_0__babel_loader_node_modules_vue_loader_lib_selector_type_script_index_0_App_vue__ = __webpack_require__(13);
        /* harmony import */
        var __WEBPACK_IMPORTED_MODULE_1__node_modules_vue_loader_lib_template_compiler_index_id_data_v_66ce2159_hasScoped_false_buble_transforms_node_modules_vue_loader_lib_selector_type_template_index_0_App_vue__ = __webpack_require__(14);

        function injectStyle(ssrContext) {
            __webpack_require__(7)
        }
        var normalizeComponent = __webpack_require__(12)
        /* script */

        /* template */

        /* template functional */
        var __vue_template_functional__ = false
        /* styles */
        var __vue_styles__ = injectStyle
        /* scopeId */
        var __vue_scopeId__ = null
        /* moduleIdentifier (server only) */
        var __vue_module_identifier__ = null
        var Component = normalizeComponent(
            __WEBPACK_IMPORTED_MODULE_0__babel_loader_node_modules_vue_loader_lib_selector_type_script_index_0_App_vue__["a" /* default */ ],
            __WEBPACK_IMPORTED_MODULE_1__node_modules_vue_loader_lib_template_compiler_index_id_data_v_66ce2159_hasScoped_false_buble_transforms_node_modules_vue_loader_lib_selector_type_template_index_0_App_vue__["a" /* default */ ],
            __vue_template_functional__,
            __vue_styles__,
            __vue_scopeId__,
            __vue_module_identifier__
        )
        console.log(Component.exports);
        /* harmony default export */
        __webpack_exports__["a"] = (Component.exports);


        /***/
    }),
    /* 7 */
    /***/
    (function (module, exports, __webpack_require__) {

        // style-loader: Adds some css to the DOM by adding a <style> tag

        // load the styles
        var content = __webpack_require__(8);
        if (typeof content === 'string') content = [
            [module.i, content, '']
        ];
        if (content.locals) module.exports = content.locals;
        // add the styles to the DOM
        var update = __webpack_require__(10)("15459d21", content, true);

        /***/
    }),
    /* 8 */
    /***/
    (function (module, exports, __webpack_require__) {

        exports = module.exports = __webpack_require__(9)(undefined);
        // imports


        // module
        exports.push([module.i, "#app{font-family:Avenir,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-align:center;color:#2c3e50;margin-top:60px}h1,h2{font-weight:400}ul{list-style-type:none;padding:0}li{display:inline-block;margin:0 10px}a{color:#42b983}", ""]);

        // exports
        console.log(exports);


        /***/
    }),
    /* 9 */
    /***/
    (function (module, exports) {

        /*
        	MIT License http://www.opensource.org/licenses/mit-license.php
        	Author Tobias Koppers @sokra
        */
        // css base code, injected by the css-loader
        module.exports = function (useSourceMap) {
            var list = [];

            // return the list of modules as css string
            list.toString = function toString() {
                return this.map(function (item) {
                    var content = cssWithMappingToString(item, useSourceMap);
                    if (item[2]) {
                        return "@media " + item[2] + "{" + content + "}";
                    } else {
                        return content;
                    }
                }).join("");
            };

            // import a list of modules into the list
            list.i = function (modules, mediaQuery) {
                if (typeof modules === "string")
                    modules = [
                        [null, modules, ""]
                    ];
                var alreadyImportedModules = {};
                for (var i = 0; i < this.length; i++) {
                    var id = this[i][0];
                    if (typeof id === "number")
                        alreadyImportedModules[id] = true;
                }
                for (i = 0; i < modules.length; i++) {
                    var item = modules[i];
                    // skip already imported module
                    // this implementation is not 100% perfect for weird media query combinations
                    //  when a module is imported multiple times with different media queries.
                    //  I hope this will never occur (Hey this way we have smaller bundles)
                    if (typeof item[0] !== "number" || !alreadyImportedModules[item[0]]) {
                        if (mediaQuery && !item[2]) {
                            item[2] = mediaQuery;
                        } else if (mediaQuery) {
                            item[2] = "(" + item[2] + ") and (" + mediaQuery + ")";
                        }
                        list.push(item);
                    }
                }
            };
            return list;
        };

        function cssWithMappingToString(item, useSourceMap) {
            var content = item[1] || '';
            var cssMapping = item[3];
            if (!cssMapping) {
                return content;
            }

            if (useSourceMap && typeof btoa === 'function') {
                var sourceMapping = toComment(cssMapping);
                var sourceURLs = cssMapping.sources.map(function (source) {
                    return '/*# sourceURL=' + cssMapping.sourceRoot + source + ' */'
                });

                return [content].concat(sourceURLs).concat([sourceMapping]).join('\n');
            }

            return [content].join('\n');
        }

        // Adapted from convert-source-map (MIT)
        function toComment(sourceMap) {
            // eslint-disable-next-line no-undef
            var base64 = btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap))));
            var data = 'sourceMappingURL=data:application/json;charset=utf-8;base64,' + base64;

            return '/*# ' + data + ' */';
        }


        /***/
    }),
    /* 10 */
    /***/
    (function (module, exports, __webpack_require__) {

        /*
          MIT License http://www.opensource.org/licenses/mit-license.php
          Author Tobias Koppers @sokra
          Modified by Evan You @yyx990803
        */

        var hasDocument = typeof document !== 'undefined'

        if (typeof DEBUG !== 'undefined' && DEBUG) {
            if (!hasDocument) {
                throw new Error(
                    'vue-style-loader cannot be used in a non-browser environment. ' +
                    "Use { target: 'node' } in your Webpack config to indicate a server-rendering environment."
                )
            }
        }

        var listToStyles = __webpack_require__(11)

        /*
        type StyleObject = {
          id: number;
          parts: Array<StyleObjectPart>
        }

        type StyleObjectPart = {
          css: string;
          media: string;
          sourceMap: ?string
        }
        */

        var stylesInDom = {
            /*
              [id: number]: {
                id: number,
                refs: number,
                parts: Array<(obj?: StyleObjectPart) => void>
              }
            */
        }

        var head = hasDocument && (document.head || document.getElementsByTagName('head')[0])
        var singletonElement = null
        var singletonCounter = 0
        var isProduction = false
        var noop = function () {}

        // Force single-tag solution on IE6-9, which has a hard limit on the # of <style>
        // tags it will allow on a page
        var isOldIE = typeof navigator !== 'undefined' && /msie [6-9]\b/.test(navigator.userAgent.toLowerCase())

        module.exports = function (parentId, list, _isProduction) {
            isProduction = _isProduction

            var styles = listToStyles(parentId, list)
            addStylesToDom(styles)

            return function update(newList) {
                var mayRemove = []
                for (var i = 0; i < styles.length; i++) {
                    var item = styles[i]
                    var domStyle = stylesInDom[item.id]
                    domStyle.refs--
                        mayRemove.push(domStyle)
                }
                if (newList) {
                    styles = listToStyles(parentId, newList)
                    addStylesToDom(styles)
                } else {
                    styles = []
                }
                for (var i = 0; i < mayRemove.length; i++) {
                    var domStyle = mayRemove[i]
                    if (domStyle.refs === 0) {
                        for (var j = 0; j < domStyle.parts.length; j++) {
                            domStyle.parts[j]()
                        }
                        delete stylesInDom[domStyle.id]
                    }
                }
            }
        }

        function addStylesToDom(styles /* Array<StyleObject> */ ) {
            for (var i = 0; i < styles.length; i++) {
                var item = styles[i]
                var domStyle = stylesInDom[item.id]
                if (domStyle) {
                    domStyle.refs++
                        for (var j = 0; j < domStyle.parts.length; j++) {
                            domStyle.parts[j](item.parts[j])
                        }
                    for (; j < item.parts.length; j++) {
                        domStyle.parts.push(addStyle(item.parts[j]))
                    }
                    if (domStyle.parts.length > item.parts.length) {
                        domStyle.parts.length = item.parts.length
                    }
                } else {
                    var parts = []
                    for (var j = 0; j < item.parts.length; j++) {
                        parts.push(addStyle(item.parts[j]))
                    }
                    stylesInDom[item.id] = {
                        id: item.id,
                        refs: 1,
                        parts: parts
                    }
                }
            }
        }

        function createStyleElement() {
            var styleElement = document.createElement('style')
            styleElement.type = 'text/css'
            head.appendChild(styleElement)
            return styleElement
        }

        function addStyle(obj /* StyleObjectPart */ ) {
            var update, remove
            var styleElement = document.querySelector('style[data-vue-ssr-id~="' + obj.id + '"]')

            if (styleElement) {
                if (isProduction) {
                    // has SSR styles and in production mode.
                    // simply do nothing.
                    return noop
                } else {
                    // has SSR styles but in dev mode.
                    // for some reason Chrome can't handle source map in server-rendered
                    // style tags - source maps in <style> only works if the style tag is
                    // created and inserted dynamically. So we remove the server rendered
                    // styles and inject new ones.
                    styleElement.parentNode.removeChild(styleElement)
                }
            }

            if (isOldIE) {
                // use singleton mode for IE9.
                var styleIndex = singletonCounter++
                    styleElement = singletonElement || (singletonElement = createStyleElement())
                update = applyToSingletonTag.bind(null, styleElement, styleIndex, false)
                remove = applyToSingletonTag.bind(null, styleElement, styleIndex, true)
            } else {
                // use multi-style-tag mode in all other cases
                styleElement = createStyleElement()
                update = applyToTag.bind(null, styleElement)
                remove = function () {
                    styleElement.parentNode.removeChild(styleElement)
                }
            }

            update(obj)

            return function updateStyle(newObj /* StyleObjectPart */ ) {
                if (newObj) {
                    if (newObj.css === obj.css &&
                        newObj.media === obj.media &&
                        newObj.sourceMap === obj.sourceMap) {
                        return
                    }
                    update(obj = newObj)
                } else {
                    remove()
                }
            }
        }

        var replaceText = (function () {
            var textStore = []

            return function (index, replacement) {
                textStore[index] = replacement
                return textStore.filter(Boolean).join('\n')
            }
        })()

        function applyToSingletonTag(styleElement, index, remove, obj) {
            var css = remove ? '' : obj.css

            if (styleElement.styleSheet) {
                styleElement.styleSheet.cssText = replaceText(index, css)
            } else {
                var cssNode = document.createTextNode(css)
                var childNodes = styleElement.childNodes
                if (childNodes[index]) styleElement.removeChild(childNodes[index])
                if (childNodes.length) {
                    styleElement.insertBefore(cssNode, childNodes[index])
                } else {
                    styleElement.appendChild(cssNode)
                }
            }
        }

        function applyToTag(styleElement, obj) {
            var css = obj.css
            var media = obj.media
            var sourceMap = obj.sourceMap

            if (media) {
                styleElement.setAttribute('media', media)
            }

            if (sourceMap) {
                // https://developer.chrome.com/devtools/docs/javascript-debugging
                // this makes source maps inside style tags work properly in Chrome
                css += '\n/*# sourceURL=' + sourceMap.sources[0] + ' */'
                // http://stackoverflow.com/a/26603875
                css += '\n/*# sourceMappingURL=data:application/json;base64,' + btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))) + ' */'
            }

            if (styleElement.styleSheet) {
                styleElement.styleSheet.cssText = css
            } else {
                while (styleElement.firstChild) {
                    styleElement.removeChild(styleElement.firstChild)
                }
                styleElement.appendChild(document.createTextNode(css))
            }
        }


        /***/
    }),
    /* 11 */
    /***/
    (function (module, exports) {

        /**
         * Translates the list format produced by css-loader into something
         * easier to manipulate.
         */
        module.exports = function listToStyles(parentId, list) {
            var styles = []
            var newStyles = {}
            for (var i = 0; i < list.length; i++) {
                var item = list[i]
                var id = item[0]
                var css = item[1]
                var media = item[2]
                var sourceMap = item[3]
                var part = {
                    id: parentId + ':' + i,
                    css: css,
                    media: media,
                    sourceMap: sourceMap
                }
                if (!newStyles[id]) {
                    styles.push(newStyles[id] = {
                        id: id,
                        parts: [part]
                    })
                } else {
                    newStyles[id].parts.push(part)
                }
            }
            return styles
        }


        /***/
    }),
    /* 12 */
    /***/
    (function (module, exports) {

        /* globals __VUE_SSR_CONTEXT__ */

        // IMPORTANT: Do NOT use ES2015 features in this file.
        // This module is a runtime utility for cleaner component module output and will
        // be included in the final webpack user bundle.

        module.exports = function normalizeComponent(
            rawScriptExports,
            compiledTemplate,
            functionalTemplate,
            injectStyles,
            scopeId,
            moduleIdentifier /* server only */
        ) {
            var esModule
            var scriptExports = rawScriptExports = rawScriptExports || {}

            // ES6 modules interop
            var type = typeof rawScriptExports.default
            if (type === 'object' || type === 'function') {
                esModule = rawScriptExports
                scriptExports = rawScriptExports.default
            }

            // Vue.extend constructor export interop
            var options = typeof scriptExports === 'function' ?
                scriptExports.options :
                scriptExports

            // render functions
            if (compiledTemplate) {
                options.render = compiledTemplate.render
                options.staticRenderFns = compiledTemplate.staticRenderFns
                options._compiled = true
            }

            // functional template
            if (functionalTemplate) {
                options.functional = true
            }

            // scopedId
            if (scopeId) {
                options._scopeId = scopeId
            }

            var hook
            if (moduleIdentifier) { // server build
                hook = function (context) {
                    // 2.3 injection
                    context =
                        context || // cached call
                        (this.$vnode && this.$vnode.ssrContext) || // stateful
                        (this.parent && this.parent.$vnode && this.parent.$vnode.ssrContext) // functional
                    // 2.2 with runInNewContext: true
                    if (!context && typeof __VUE_SSR_CONTEXT__ !== 'undefined') {
                        context = __VUE_SSR_CONTEXT__
                    }
                    // inject component styles
                    if (injectStyles) {
                        injectStyles.call(this, context)
                    }
                    // register component module identifier for async chunk inferrence
                    if (context && context._registeredComponents) {
                        context._registeredComponents.add(moduleIdentifier)
                    }
                }
                // used by ssr in case component is cached and beforeCreate
                // never gets called
                options._ssrRegister = hook
            } else if (injectStyles) {
                hook = injectStyles
            }

            if (hook) {
                var functional = options.functional
                var existing = functional ?
                    options.render :
                    options.beforeCreate

                if (!functional) {
                    // inject component registration as beforeCreate hook
                    options.beforeCreate = existing ?
                        [].concat(existing, hook) :
                        [hook]
                } else {
                    // for template-only hot-reload because in that case the render fn doesn't
                    // go through the normalizer
                    options._injectStyles = hook
                    // register for functioal component in vue file
                    options.render = function renderWithStyleInjection(h, context) {
                        hook.call(context)
                        return existing(h, context)
                    }
                }
            }

            return {
                esModule: esModule,
                exports: scriptExports,
                options: options
            }
        }


        /***/
    }),
    /* 13 */
    /***/
    (function (module, __webpack_exports__, __webpack_require__) {

        "use strict";
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
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        //

        /* harmony default export */
        __webpack_exports__["a"] = ({
            name: 'app',
            data: function data() {
                return {
                    msg: 'Welcome to Your Vue.js App'
                };
            }
        });

        /***/
    }),
    /* 14 */
    /***/
    (function (module, __webpack_exports__, __webpack_require__) {

        "use strict";
        var render = function () {
            var _vm = this;
            var _h = _vm.$createElement;
            var _c = _vm._self._c || _h;
            return _c('div', {
                attrs: {
                    "id": "app"
                }
            }, [_c('h1', [_vm._v(_vm._s(_vm.msg))]), _vm._v(" "), _c('h2', [_vm._v("Essential Links")]), _vm._v(" "), _vm._m(0, false, false), _vm._v(" "), _c('h2', [_vm._v("Ecosystem")]), _vm._v(" "), _vm._m(1, false, false)])
        }
        var staticRenderFns = [function () {
            var _vm = this;
            var _h = _vm.$createElement;
            var _c = _vm._self._c || _h;
            return _c('ul', [_c('li', [_c('a', {
                attrs: {
                    "href": "https://vuejs.org",
                    "target": "_blank"
                }
            }, [_vm._v("Core Docs")])]), _vm._v(" "), _c('li', [_c('a', {
                attrs: {
                    "href": "https://forum.vuejs.org",
                    "target": "_blank"
                }
            }, [_vm._v("Forum")])]), _vm._v(" "), _c('li', [_c('a', {
                attrs: {
                    "href": "https://chat.vuejs.org",
                    "target": "_blank"
                }
            }, [_vm._v("Community Chat")])]), _vm._v(" "), _c('li', [_c('a', {
                attrs: {
                    "href": "https://twitter.com/vuejs",
                    "target": "_blank"
                }
            }, [_vm._v("Twitter")])])])
        }, function () {
            var _vm = this;
            var _h = _vm.$createElement;
            var _c = _vm._self._c || _h;
            return _c('ul', [_c('li', [_c('a', {
                attrs: {
                    "href": "http://router.vuejs.org/",
                    "target": "_blank"
                }
            }, [_vm._v("vue-router")])]), _vm._v(" "), _c('li', [_c('a', {
                attrs: {
                    "href": "http://vuex.vuejs.org/",
                    "target": "_blank"
                }
            }, [_vm._v("vuex")])]), _vm._v(" "), _c('li', [_c('a', {
                attrs: {
                    "href": "http://vue-loader.vuejs.org/",
                    "target": "_blank"
                }
            }, [_vm._v("vue-loader")])]), _vm._v(" "), _c('li', [_c('a', {
                attrs: {
                    "href": "https://github.com/vuejs/awesome-vue",
                    "target": "_blank"
                }
            }, [_vm._v("awesome-vue")])])])
        }]
        var esExports = {
            render: render,
            staticRenderFns: staticRenderFns
        }
        /* harmony default export */
        __webpack_exports__["a"] = (esExports);

        /***/
    })
    /******/
]);
//# sourceMappingURL=build.js.map