m3graph/public/assets/js/vue-router.js

/* download from https://www.unpkg.com/vue-router@3.5.3/dist/vue-router.js */
/* fix bug: this.$router maybe undefined in RouterLink.render */
/*!
  * vue-router v3.5.3
  * (c) 2021 Evan You
  * @license MIT
  */
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define(factory) :
    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.VueRouter = factory());
  }(this, (function () { 'use strict';
  
    /*  */
  
    function assert (condition, message) {
      if (!condition) {
        throw new Error(("[vue-router] " + message))
      }
    }
  
    function warn (condition, message) {
      if (!condition) {
        typeof console !== 'undefined' && console.warn(("[vue-router] " + message));
      }
    }
  
    function extend (a, b) {
      for (var key in b) {
        a[key] = b[key];
      }
      return a
    }
  
    /*  */
  
    var encodeReserveRE = /[!'()*]/g;
    var encodeReserveReplacer = function (c) { return '%' + c.charCodeAt(0).toString(16); };
    var commaRE = /%2C/g;
  
    // fixed encodeURIComponent which is more conformant to RFC3986:
    // - escapes [!'()*]
    // - preserve commas
    var encode = function (str) { return encodeURIComponent(str)
        .replace(encodeReserveRE, encodeReserveReplacer)
        .replace(commaRE, ','); };
  
    function decode (str) {
      try {
        return decodeURIComponent(str)
      } catch (err) {
        {
          warn(false, ("Error decoding \"" + str + "\". Leaving it intact."));
        }
      }
      return str
    }
  
    function resolveQuery (
      query,
      extraQuery,
      _parseQuery
    ) {
      if ( extraQuery === void 0 ) extraQuery = {};
  
      var parse = _parseQuery || parseQuery;
      var parsedQuery;
      try {
        parsedQuery = parse(query || '');
      } catch (e) {
        warn(false, e.message);
        parsedQuery = {};
      }
      for (var key in extraQuery) {
        var value = extraQuery[key];
        parsedQuery[key] = Array.isArray(value)
          ? value.map(castQueryParamValue)
          : castQueryParamValue(value);
      }
      return parsedQuery
    }
  
    var castQueryParamValue = function (value) { return (value == null || typeof value === 'object' ? value : String(value)); };
  
    function parseQuery (query) {
      var res = {};
  
      query = query.trim().replace(/^(\?|#|&)/, '');
  
      if (!query) {
        return res
      }
  
      query.split('&').forEach(function (param) {
        var parts = param.replace(/\+/g, ' ').split('=');
        var key = decode(parts.shift());
        var val = parts.length > 0 ? decode(parts.join('=')) : null;
  
        if (res[key] === undefined) {
          res[key] = val;
        } else if (Array.isArray(res[key])) {
          res[key].push(val);
        } else {
          res[key] = [res[key], val];
        }
      });
  
      return res
    }
  
    function stringifyQuery (obj) {
      var res = obj
        ? Object.keys(obj)
          .map(function (key) {
            var val = obj[key];
  
            if (val === undefined) {
              return ''
            }
  
            if (val === null) {
              return encode(key)
            }
  
            if (Array.isArray(val)) {
              var result = [];
              val.forEach(function (val2) {
                if (val2 === undefined) {
                  return
                }
                if (val2 === null) {
                  result.push(encode(key));
                } else {
                  result.push(encode(key) + '=' + encode(val2));
                }
              });
              return result.join('&')
            }
  
            return encode(key) + '=' + encode(val)
          })
          .filter(function (x) { return x.length > 0; })
          .join('&')
        : null;
      return res ? ("?" + res) : ''
    }
  
    /*  */
  
    var trailingSlashRE = /\/?$/;
  
    function createRoute (
      record,
      location,
      redirectedFrom,
      router
    ) {
      var stringifyQuery = router && router.options.stringifyQuery;
  
      var query = location.query || {};
      try {
        query = clone(query);
      } catch (e) {}
  
      var route = {
        name: location.name || (record && record.name),
        meta: (record && record.meta) || {},
        path: location.path || '/',
        hash: location.hash || '',
        query: query,
        params: location.params || {},
        fullPath: getFullPath(location, stringifyQuery),
        matched: record ? formatMatch(record) : []
      };
      if (redirectedFrom) {
        route.redirectedFrom = getFullPath(redirectedFrom, stringifyQuery);
      }
      return Object.freeze(route)
    }
  
    function clone (value) {
      if (Array.isArray(value)) {
        return value.map(clone)
      } else if (value && typeof value === 'object') {
        var res = {};
        for (var key in value) {
          res[key] = clone(value[key]);
        }
        return res
      } else {
        return value
      }
    }
  
    // the starting route that represents the initial state
    var START = createRoute(null, {
      path: '/'
    });
  
    function formatMatch (record) {
      var res = [];
      while (record) {
        res.unshift(record);
        record = record.parent;
      }
      return res
    }
  
    function getFullPath (
      ref,
      _stringifyQuery
    ) {
      var path = ref.path;
      var query = ref.query; if ( query === void 0 ) query = {};
      var hash = ref.hash; if ( hash === void 0 ) hash = '';
  
      var stringify = _stringifyQuery || stringifyQuery;
      return (path || '/') + stringify(query) + hash
    }
  
    function isSameRoute (a, b, onlyPath) {
      if (b === START) {
        return a === b
      } else if (!b) {
        return false
      } else if (a.path && b.path) {
        return a.path.replace(trailingSlashRE, '') === b.path.replace(trailingSlashRE, '') && (onlyPath ||
          a.hash === b.hash &&
          isObjectEqual(a.query, b.query))
      } else if (a.name && b.name) {
        return (
          a.name === b.name &&
          (onlyPath || (
            a.hash === b.hash &&
          isObjectEqual(a.query, b.query) &&
          isObjectEqual(a.params, b.params))
          )
        )
      } else {
        return false
      }
    }
  
    function isObjectEqual (a, b) {
      if ( a === void 0 ) a = {};
      if ( b === void 0 ) b = {};
  
      // handle null value #1566
      if (!a || !b) { return a === b }
      var aKeys = Object.keys(a).sort();
      var bKeys = Object.keys(b).sort();
      if (aKeys.length !== bKeys.length) {
        return false
      }
      return aKeys.every(function (key, i) {
        var aVal = a[key];
        var bKey = bKeys[i];
        if (bKey !== key) { return false }
        var bVal = b[key];
        // query values can be null and undefined
        if (aVal == null || bVal == null) { return aVal === bVal }
        // check nested equality
        if (typeof aVal === 'object' && typeof bVal === 'object') {
          return isObjectEqual(aVal, bVal)
        }
        return String(aVal) === String(bVal)
      })
    }
  
    function isIncludedRoute (current, target) {
      return (
        current.path.replace(trailingSlashRE, '/').indexOf(
          target.path.replace(trailingSlashRE, '/')
        ) === 0 &&
        (!target.hash || current.hash === target.hash) &&
        queryIncludes(current.query, target.query)
      )
    }
  
    function queryIncludes (current, target) {
      for (var key in target) {
        if (!(key in current)) {
          return false
        }
      }
      return true
    }
  
    function handleRouteEntered (route) {
      for (var i = 0; i < route.matched.length; i++) {
        var record = route.matched[i];
        for (var name in record.instances) {
          var instance = record.instances[name];
          var cbs = record.enteredCbs[name];
          if (!instance || !cbs) { continue }
          delete record.enteredCbs[name];
          for (var i$1 = 0; i$1 < cbs.length; i$1++) {
            if (!instance._isBeingDestroyed) { cbs[i$1](instance); }
          }
        }
      }
    }
  
    var View = {
      name: 'RouterView',
      functional: true,
      props: {
        name: {
          type: String,
          default: 'default'
        }
      },
      render: function render (_, ref) {
        var props = ref.props;
        var children = ref.children;
        var parent = ref.parent;
        var data = ref.data;
  
        // used by devtools to display a router-view badge
        data.routerView = true;
  
        // directly use parent context's createElement() function
        // so that components rendered by router-view can resolve named slots
        var h = parent.$createElement;
        var name = props.name;
        var route = parent.$route;
        var cache = parent._routerViewCache || (parent._routerViewCache = {});
  
        // determine current view depth, also check to see if the tree
        // has been toggled inactive but kept-alive.
        var depth = 0;
        var inactive = false;
        while (parent && parent._routerRoot !== parent) {
          var vnodeData = parent.$vnode ? parent.$vnode.data : {};
          if (vnodeData.routerView) {
            depth++;
          }
          if (vnodeData.keepAlive && parent._directInactive && parent._inactive) {
            inactive = true;
          }
          parent = parent.$parent;
        }
        data.routerViewDepth = depth;
  
        // render previous view if the tree is inactive and kept-alive
        if (inactive) {
          var cachedData = cache[name];
          var cachedComponent = cachedData && cachedData.component;
          if (cachedComponent) {
            // #2301
            // pass props
            if (cachedData.configProps) {
              fillPropsinData(cachedComponent, data, cachedData.route, cachedData.configProps);
            }
            return h(cachedComponent, data, children)
          } else {
            // render previous empty view
            return h()
          }
        }
  
        var matched = route.matched[depth];
        var component = matched && matched.components[name];
  
        // render empty node if no matched route or no config component
        if (!matched || !component) {
          cache[name] = null;
          return h()
        }
  
        // cache component
        cache[name] = { component: component };
  
        // attach instance registration hook
        // this will be called in the instance's injected lifecycle hooks
        data.registerRouteInstance = function (vm, val) {
          // val could be undefined for unregistration
          var current = matched.instances[name];
          if (
            (val && current !== vm) ||
            (!val && current === vm)
          ) {
            matched.instances[name] = val;
          }
        }
  
        // also register instance in prepatch hook
        // in case the same component instance is reused across different routes
        ;(data.hook || (data.hook = {})).prepatch = function (_, vnode) {
          matched.instances[name] = vnode.componentInstance;
        };
  
        // register instance in init hook
        // in case kept-alive component be actived when routes changed
        data.hook.init = function (vnode) {
          if (vnode.data.keepAlive &&
            vnode.componentInstance &&
            vnode.componentInstance !== matched.instances[name]
          ) {
            matched.instances[name] = vnode.componentInstance;
          }
  
          // if the route transition has already been confirmed then we weren't
          // able to call the cbs during confirmation as the component was not
          // registered yet, so we call it here.
          handleRouteEntered(route);
        };
  
        var configProps = matched.props && matched.props[name];
        // save route and configProps in cache
        if (configProps) {
          extend(cache[name], {
            route: route,
            configProps: configProps
          });
          fillPropsinData(component, data, route, configProps);
        }
  
        return h(component, data, children)
      }
    };
  
    function fillPropsinData (component, data, route, configProps) {
      // resolve props
      var propsToPass = data.props = resolveProps(route, configProps);
      if (propsToPass) {
        // clone to prevent mutation
        propsToPass = data.props = extend({}, propsToPass);
        // pass non-declared props as attrs
        var attrs = data.attrs = data.attrs || {};
        for (var key in propsToPass) {
          if (!component.props || !(key in component.props)) {
            attrs[key] = propsToPass[key];
            delete propsToPass[key];
          }
        }
      }
    }
  
    function resolveProps (route, config) {
      switch (typeof config) {
        case 'undefined':
          return
        case 'object':
          return config
        case 'function':
          return config(route)
        case 'boolean':
          return config ? route.params : undefined
        default:
          {
            warn(
              false,
              "props in \"" + (route.path) + "\" is a " + (typeof config) + ", " +
              "expecting an object, function or boolean."
            );
          }
      }
    }
  
    /*  */
  
    function resolvePath (
      relative,
      base,
      append
    ) {
      var firstChar = relative.charAt(0);
      if (firstChar === '/') {
        return relative
      }
  
      if (firstChar === '?' || firstChar === '#') {
        return base + relative
      }
  
      var stack = base.split('/');
  
      // remove trailing segment if:
      // - not appending
      // - appending to trailing slash (last segment is empty)
      if (!append || !stack[stack.length - 1]) {
        stack.pop();
      }
  
      // resolve relative path
      var segments = relative.replace(/^\//, '').split('/');
      for (var i = 0; i < segments.length; i++) {
        var segment = segments[i];
        if (segment === '..') {
          stack.pop();
        } else if (segment !== '.') {
          stack.push(segment);
        }
      }
  
      // ensure leading slash
      if (stack[0] !== '') {
        stack.unshift('');
      }
  
      return stack.join('/')
    }
  
    function parsePath (path) {
      var hash = '';
      var query = '';
  
      var hashIndex = path.indexOf('#');
      if (hashIndex >= 0) {
        hash = path.slice(hashIndex);
        path = path.slice(0, hashIndex);
      }
  
      var queryIndex = path.indexOf('?');
      if (queryIndex >= 0) {
        query = path.slice(queryIndex + 1);
        path = path.slice(0, queryIndex);
      }
  
      return {
        path: path,
        query: query,
        hash: hash
      }
    }
  
    function cleanPath (path) {
      return path.replace(/\/+/g, '/')
    }
  
    var isarray = Array.isArray || function (arr) {
      return Object.prototype.toString.call(arr) == '[object Array]';
    };
  
    /**
     * Expose `pathToRegexp`.
     */
    var pathToRegexp_1 = pathToRegexp;
    var parse_1 = parse;
    var compile_1 = compile;
    var tokensToFunction_1 = tokensToFunction;
    var tokensToRegExp_1 = tokensToRegExp;
  
    /**
     * The main path matching regexp utility.
     *
     * @type {RegExp}
     */
    var PATH_REGEXP = new RegExp([
      // Match escaped characters that would otherwise appear in future matches.
      // This allows the user to escape special characters that won't transform.
      '(\\\\.)',
      // Match Express-style parameters and un-named parameters with a prefix
      // and optional suffixes. Matches appear as:
      //
      // "/:test(\\d+)?" => ["/", "test", "\d+", undefined, "?", undefined]
      // "/route(\\d+)"  => [undefined, undefined, undefined, "\d+", undefined, undefined]
      // "/*"            => ["/", undefined, undefined, undefined, undefined, "*"]
      '([\\/.])?(?:(?:\\:(\\w+)(?:\\(((?:\\\\.|[^\\\\()])+)\\))?|\\(((?:\\\\.|[^\\\\()])+)\\))([+*?])?|(\\*))'
    ].join('|'), 'g');
  
    /**
     * Parse a string for the raw tokens.
     *
     * @param  {string}  str
     * @param  {Object=} options
     * @return {!Array}
     */
    function parse (str, options) {
      var tokens = [];
      var key = 0;
      var index = 0;
      var path = '';
      var defaultDelimiter = options && options.delimiter || '/';
      var res;
  
      while ((res = PATH_REGEXP.exec(str)) != null) {
        var m = res[0];
        var escaped = res[1];
        var offset = res.index;
        path += str.slice(index, offset);
        index = offset + m.length;
  
        // Ignore already escaped sequences.
        if (escaped) {
          path += escaped[1];
          continue
        }
  
        var next = str[index];
        var prefix = res[2];
        var name = res[3];
        var capture = res[4];
        var group = res[5];
        var modifier = res[6];
        var asterisk = res[7];
  
        // Push the current path onto the tokens.
        if (path) {
          tokens.push(path);
          path = '';
        }
  
        var partial = prefix != null && next != null && next !== prefix;
        var repeat = modifier === '+' || modifier === '*';
        var optional = modifier === '?' || modifier === '*';
        var delimiter = res[2] || defaultDelimiter;
        var pattern = capture || group;
  
        tokens.push({
          name: name || key++,
          prefix: prefix || '',
          delimiter: delimiter,
          optional: optional,
          repeat: repeat,
          partial: partial,
          asterisk: !!asterisk,
          pattern: pattern ? escapeGroup(pattern) : (asterisk ? '.*' : '[^' + escapeString(delimiter) + ']+?')
        });
      }
  
      // Match any characters still remaining.
      if (index < str.length) {
        path += str.substr(index);
      }
  
      // If the path exists, push it onto the end.
      if (path) {
        tokens.push(path);
      }
  
      return tokens
    }
  
    /**
     * Compile a string to a template function for the path.
     *
     * @param  {string}             str
     * @param  {Object=}            options
     * @return {!function(Object=, Object=)}
     */
    function compile (str, options) {
      return tokensToFunction(parse(str, options), options)
    }
  
    /**
     * Prettier encoding of URI path segments.
     *
     * @param  {string}
     * @return {string}
     */
    function encodeURIComponentPretty (str) {
      return encodeURI(str).replace(/[\/?#]/g, function (c) {
        return '%' + c.charCodeAt(0).toString(16).toUpperCase()
      })
    }
  
    /**
     * Encode the asterisk parameter. Similar to `pretty`, but allows slashes.
     *
     * @param  {string}
     * @return {string}
     */
    function encodeAsterisk (str) {
      return encodeURI(str).replace(/[?#]/g, function (c) {
        return '%' + c.charCodeAt(0).toString(16).toUpperCase()
      })
    }
  
    /**
     * Expose a method for transforming tokens into the path function.
     */
    function tokensToFunction (tokens, options) {
      // Compile all the tokens into regexps.
      var matches = new Array(tokens.length);
  
      // Compile all the patterns before compilation.
      for (var i = 0; i < tokens.length; i++) {
        if (typeof tokens[i] === 'object') {
          matches[i] = new RegExp('^(?:' + tokens[i].pattern + ')$', flags(options));
        }
      }
  
      return function (obj, opts) {
        var path = '';
        var data = obj || {};
        var options = opts || {};
        var encode = options.pretty ? encodeURIComponentPretty : encodeURIComponent;
  
        for (var i = 0; i < tokens.length; i++) {
          var token = tokens[i];
  
          if (typeof token === 'string') {
            path += token;
  
            continue
          }
  
          var value = data[token.name];
          var segment;
  
          if (value == null) {
            if (token.optional) {
              // Prepend partial segment prefixes.
              if (token.partial) {
                path += token.prefix;
              }
  
              continue
            } else {
              throw new TypeError('Expected "' + token.name + '" to be defined')
            }
          }
  
          if (isarray(value)) {
            if (!token.repeat) {
              throw new TypeError('Expected "' + token.name + '" to not repeat, but received `' + JSON.stringify(value) + '`')
            }
  
            if (value.length === 0) {
              if (token.optional) {
                continue
              } else {
                throw new TypeError('Expected "' + token.name + '" to not be empty')
              }
            }
  
            for (var j = 0; j < value.length; j++) {
              segment = encode(value[j]);
  
              if (!matches[i].test(segment)) {
                throw new TypeError('Expected all "' + token.name + '" to match "' + token.pattern + '", but received `' + JSON.stringify(segment) + '`')
              }
  
              path += (j === 0 ? token.prefix : token.delimiter) + segment;
            }
  
            continue
          }
  
          segment = token.asterisk ? encodeAsterisk(value) : encode(value);
  
          if (!matches[i].test(segment)) {
            throw new TypeError('Expected "' + token.name + '" to match "' + token.pattern + '", but received "' + segment + '"')
          }
  
          path += token.prefix + segment;
        }
  
        return path
      }
    }
  
    /**
     * Escape a regular expression string.
     *
     * @param  {string} str
     * @return {string}
     */
    function escapeString (str) {
      return str.replace(/([.+*?=^!:${}()[\]|\/\\])/g, '\\$1')
    }
  
    /**
     * Escape the capturing group by escaping special characters and meaning.
     *
     * @param  {string} group
     * @return {string}
     */
    function escapeGroup (group) {
      return group.replace(/([=!:$\/()])/g, '\\$1')
    }
  
    /**
     * Attach the keys as a property of the regexp.
     *
     * @param  {!RegExp} re
     * @param  {Array}   keys
     * @return {!RegExp}
     */
    function attachKeys (re, keys) {
      re.keys = keys;
      return re
    }
  
    /**
     * Get the flags for a regexp from the options.
     *
     * @param  {Object} options
     * @return {string}
     */
    function flags (options) {
      return options && options.sensitive ? '' : 'i'
    }
  
    /**
     * Pull out keys from a regexp.
     *
     * @param  {!RegExp} path
     * @param  {!Array}  keys
     * @return {!RegExp}
     */
    function regexpToRegexp (path, keys) {
      // Use a negative lookahead to match only capturing groups.
      var groups = path.source.match(/\((?!\?)/g);
  
      if (groups) {
        for (var i = 0; i < groups.length; i++) {
          keys.push({
            name: i,
            prefix: null,
            delimiter: null,
            optional: false,
            repeat: false,
            partial: false,
            asterisk: false,
            pattern: null
          });
        }
      }
  
      return attachKeys(path, keys)
    }
  
    /**
     * Transform an array into a regexp.
     *
     * @param  {!Array}  path
     * @param  {Array}   keys
     * @param  {!Object} options
     * @return {!RegExp}
     */
    function arrayToRegexp (path, keys, options) {
      var parts = [];
  
      for (var i = 0; i < path.length; i++) {
        parts.push(pathToRegexp(path[i], keys, options).source);
      }
  
      var regexp = new RegExp('(?:' + parts.join('|') + ')', flags(options));
  
      return attachKeys(regexp, keys)
    }
  
    /**
     * Create a path regexp from string input.
     *
     * @param  {string}  path
     * @param  {!Array}  keys
     * @param  {!Object} options
     * @return {!RegExp}
     */
    function stringToRegexp (path, keys, options) {
      return tokensToRegExp(parse(path, options), keys, options)
    }
  
    /**
     * Expose a function for taking tokens and returning a RegExp.
     *
     * @param  {!Array}          tokens
     * @param  {(Array|Object)=} keys
     * @param  {Object=}         options
     * @return {!RegExp}
     */
    function tokensToRegExp (tokens, keys, options) {
      if (!isarray(keys)) {
        options = /** @type {!Object} */ (keys || options);
        keys = [];
      }
  
      options = options || {};
  
      var strict = options.strict;
      var end = options.end !== false;
      var route = '';
  
      // Iterate over the tokens and create our regexp string.
      for (var i = 0; i < tokens.length; i++) {
        var token = tokens[i];
  
        if (typeof token === 'string') {
          route += escapeString(token);
        } else {
          var prefix = escapeString(token.prefix);
          var capture = '(?:' + token.pattern + ')';
  
          keys.push(token);
  
          if (token.repeat) {
            capture += '(?:' + prefix + capture + ')*';
          }
  
          if (token.optional) {
            if (!token.partial) {
              capture = '(?:' + prefix + '(' + capture + '))?';
            } else {
              capture = prefix + '(' + capture + ')?';
            }
          } else {
            capture = prefix + '(' + capture + ')';
          }
  
          route += capture;
        }
      }
  
      var delimiter = escapeString(options.delimiter || '/');
      var endsWithDelimiter = route.slice(-delimiter.length) === delimiter;
  
      // In non-strict mode we allow a slash at the end of match. If the path to
      // match already ends with a slash, we remove it for consistency. The slash
      // is valid at the end of a path match, not in the middle. This is important
      // in non-ending mode, where "/test/" shouldn't match "/test//route".
      if (!strict) {
        route = (endsWithDelimiter ? route.slice(0, -delimiter.length) : route) + '(?:' + delimiter + '(?=$))?';
      }
  
      if (end) {
        route += '$';
      } else {
        // In non-ending mode, we need the capturing groups to match as much as
        // possible by using a positive lookahead to the end or next path segment.
        route += strict && endsWithDelimiter ? '' : '(?=' + delimiter + '|$)';
      }
  
      return attachKeys(new RegExp('^' + route, flags(options)), keys)
    }
  
    /**
     * Normalize the given path string, returning a regular expression.
     *
     * An empty array can be passed in for the keys, which will hold the
     * placeholder key descriptions. For example, using `/user/:id`, `keys` will
     * contain `[{ name: 'id', delimiter: '/', optional: false, repeat: false }]`.
     *
     * @param  {(string|RegExp|Array)} path
     * @param  {(Array|Object)=}       keys
     * @param  {Object=}               options
     * @return {!RegExp}
     */
    function pathToRegexp (path, keys, options) {
      if (!isarray(keys)) {
        options = /** @type {!Object} */ (keys || options);
        keys = [];
      }
  
      options = options || {};
  
      if (path instanceof RegExp) {
        return regexpToRegexp(path, /** @type {!Array} */ (keys))
      }
  
      if (isarray(path)) {
        return arrayToRegexp(/** @type {!Array} */ (path), /** @type {!Array} */ (keys), options)
      }
  
      return stringToRegexp(/** @type {string} */ (path), /** @type {!Array} */ (keys), options)
    }
    pathToRegexp_1.parse = parse_1;
    pathToRegexp_1.compile = compile_1;
    pathToRegexp_1.tokensToFunction = tokensToFunction_1;
    pathToRegexp_1.tokensToRegExp = tokensToRegExp_1;
  
    /*  */
  
    // $flow-disable-line
    var regexpCompileCache = Object.create(null);
  
    function fillParams (
      path,
      params,
      routeMsg
    ) {
      params = params || {};
      try {
        var filler =
          regexpCompileCache[path] ||
          (regexpCompileCache[path] = pathToRegexp_1.compile(path));
  
        // Fix #2505 resolving asterisk routes { name: 'not-found', params: { pathMatch: '/not-found' }}
        // and fix #3106 so that you can work with location descriptor object having params.pathMatch equal to empty string
        if (typeof params.pathMatch === 'string') { params[0] = params.pathMatch; }
  
        return filler(params, { pretty: true })
      } catch (e) {
        {
          // Fix #3072 no warn if `pathMatch` is string
          warn(typeof params.pathMatch === 'string', ("missing param for " + routeMsg + ": " + (e.message)));
        }
        return ''
      } finally {
        // delete the 0 if it was added
        delete params[0];
      }
    }
  
    /*  */
  
    function normalizeLocation (
      raw,
      current,
      append,
      router
    ) {
      var next = typeof raw === 'string' ? { path: raw } : raw;
      // named target
      if (next._normalized) {
        return next
      } else if (next.name) {
        next = extend({}, raw);
        var params = next.params;
        if (params && typeof params === 'object') {
          next.params = extend({}, params);
        }
        return next
      }
  
      // relative params
      if (!next.path && next.params && current) {
        next = extend({}, next);
        next._normalized = true;
        var params$1 = extend(extend({}, current.params), next.params);
        if (current.name) {
          next.name = current.name;
          next.params = params$1;
        } else if (current.matched.length) {
          var rawPath = current.matched[current.matched.length - 1].path;
          next.path = fillParams(rawPath, params$1, ("path " + (current.path)));
        } else {
          warn(false, "relative params navigation requires a current route.");
        }
        return next
      }
  
      var parsedPath = parsePath(next.path || '');
      var basePath = (current && current.path) || '/';
      var path = parsedPath.path
        ? resolvePath(parsedPath.path, basePath, append || next.append)
        : basePath;
  
      var query = resolveQuery(
        parsedPath.query,
        next.query,
        router && router.options.parseQuery
      );
  
      var hash = next.hash || parsedPath.hash;
      if (hash && hash.charAt(0) !== '#') {
        hash = "#" + hash;
      }
  
      return {
        _normalized: true,
        path: path,
        query: query,
        hash: hash
      }
    }
  
    /*  */
  
    // work around weird flow bug
    var toTypes = [String, Object];
    var eventTypes = [String, Array];
  
    var noop = function () {};
  
    var warnedCustomSlot;
    var warnedTagProp;
    var warnedEventProp;
  
    var Link = {
      name: 'RouterLink',
      props: {
        to: {
          type: toTypes,
          required: true
        },
        tag: {
          type: String,
          default: 'a'
        },
        custom: Boolean,
        exact: Boolean,
        exactPath: Boolean,
        append: Boolean,
        replace: Boolean,
        activeClass: String,
        exactActiveClass: String,
        ariaCurrentValue: {
          type: String,
          default: 'page'
        },
        event: {
          type: eventTypes,
          default: 'click'
        }
      },
      render: function render (h) {
        var this$1 = this;
  
        var router = this.$router;
        if(!router){
          return "router is undefined";
        }
        var current = this.$route;
        var ref = router.resolve(
          this.to,
          current,
          this.append
        );
        var location = ref.location;
        var route = ref.route;
        var href = ref.href;
  
        var classes = {};
        var globalActiveClass = router.options.linkActiveClass;
        var globalExactActiveClass = router.options.linkExactActiveClass;
        // Support global empty active class
        var activeClassFallback =
          globalActiveClass == null ? 'router-link-active' : globalActiveClass;
        var exactActiveClassFallback =
          globalExactActiveClass == null
            ? 'router-link-exact-active'
            : globalExactActiveClass;
        var activeClass =
          this.activeClass == null ? activeClassFallback : this.activeClass;
        var exactActiveClass =
          this.exactActiveClass == null
            ? exactActiveClassFallback
            : this.exactActiveClass;
  
        var compareTarget = route.redirectedFrom
          ? createRoute(null, normalizeLocation(route.redirectedFrom), null, router)
          : route;
  
        classes[exactActiveClass] = isSameRoute(current, compareTarget, this.exactPath);
        classes[activeClass] = this.exact || this.exactPath
          ? classes[exactActiveClass]
          : isIncludedRoute(current, compareTarget);
  
        var ariaCurrentValue = classes[exactActiveClass] ? this.ariaCurrentValue : null;
  
        var handler = function (e) {
          if (guardEvent(e)) {
            if (this$1.replace) {
              router.replace(location, noop);
            } else {
              router.push(location, noop);
            }
          }
        };
  
        var on = { click: guardEvent };
        if (Array.isArray(this.event)) {
          this.event.forEach(function (e) {
            on[e] = handler;
          });
        } else {
          on[this.event] = handler;
        }
  
        var data = { class: classes };
  
        var scopedSlot =
          !this.$scopedSlots.$hasNormal &&
          this.$scopedSlots.default &&
          this.$scopedSlots.default({
            href: href,
            route: route,
            navigate: handler,
            isActive: classes[activeClass],
            isExactActive: classes[exactActiveClass]
          });
  
        if (scopedSlot) {
          if (!this.custom) {
            !warnedCustomSlot && warn(false, 'In Vue Router 4, the v-slot API will by default wrap its content with an <a> element. Use the custom prop to remove this warning:\n<router-link v-slot="{ navigate, href }" custom></router-link>\n');
            warnedCustomSlot = true;
          }
          if (scopedSlot.length === 1) {
            return scopedSlot[0]
          } else if (scopedSlot.length > 1 || !scopedSlot.length) {
            {
              warn(
                false,
                ("<router-link> with to=\"" + (this.to) + "\" is trying to use a scoped slot but it didn't provide exactly one child. Wrapping the content with a span element.")
              );
            }
            return scopedSlot.length === 0 ? h() : h('span', {}, scopedSlot)
          }
        }
  
        {
          if ('tag' in this.$options.propsData && !warnedTagProp) {
            warn(
              false,
              "<router-link>'s tag prop is deprecated and has been removed in Vue Router 4. Use the v-slot API to remove this warning: https://next.router.vuejs.org/guide/migration/#removal-of-event-and-tag-props-in-router-link."
            );
            warnedTagProp = true;
          }
          if ('event' in this.$options.propsData && !warnedEventProp) {
            warn(
              false,
              "<router-link>'s event prop is deprecated and has been removed in Vue Router 4. Use the v-slot API to remove this warning: https://next.router.vuejs.org/guide/migration/#removal-of-event-and-tag-props-in-router-link."
            );
            warnedEventProp = true;
          }
        }
  
        if (this.tag === 'a') {
          data.on = on;
          data.attrs = { href: href, 'aria-current': ariaCurrentValue };
        } else {
          // find the first <a> child and apply listener and href
          var a = findAnchor(this.$slots.default);
          if (a) {
            // in case the <a> is a static node
            a.isStatic = false;
            var aData = (a.data = extend({}, a.data));
            aData.on = aData.on || {};
            // transform existing events in both objects into arrays so we can push later
            for (var event in aData.on) {
              var handler$1 = aData.on[event];
              if (event in on) {
                aData.on[event] = Array.isArray(handler$1) ? handler$1 : [handler$1];
              }
            }
            // append new listeners for router-link
            for (var event$1 in on) {
              if (event$1 in aData.on) {
                // on[event] is always a function
                aData.on[event$1].push(on[event$1]);
              } else {
                aData.on[event$1] = handler;
              }
            }
  
            var aAttrs = (a.data.attrs = extend({}, a.data.attrs));
            aAttrs.href = href;
            aAttrs['aria-current'] = ariaCurrentValue;
          } else {
            // doesn't have <a> child, apply listener to self
            data.on = on;
          }
        }
  
        return h(this.tag, data, this.$slots.default)
      }
    };
  
    function guardEvent (e) {
      // don't redirect with control keys
      if (e.metaKey || e.altKey || e.ctrlKey || e.shiftKey) { return }
      // don't redirect when preventDefault called
      if (e.defaultPrevented) { return }
      // don't redirect on right click
      if (e.button !== undefined && e.button !== 0) { return }
      // don't redirect if `target="_blank"`
      if (e.currentTarget && e.currentTarget.getAttribute) {
        var target = e.currentTarget.getAttribute('target');
        if (/\b_blank\b/i.test(target)) { return }
      }
      // this may be a Weex event which doesn't have this method
      if (e.preventDefault) {
        e.preventDefault();
      }
      return true
    }
  
    function findAnchor (children) {
      if (children) {
        var child;
        for (var i = 0; i < children.length; i++) {
          child = children[i];
          if (child.tag === 'a') {
            return child
          }
          if (child.children && (child = findAnchor(child.children))) {
            return child
          }
        }
      }
    }
  
    var _Vue;
  
    function install (Vue) {
      if (install.installed && _Vue === Vue) { return }
      install.installed = true;
  
      _Vue = Vue;
  
      var isDef = function (v) { return v !== undefined; };
  
      var registerInstance = function (vm, callVal) {
        var i = vm.$options._parentVnode;
        if (isDef(i) && isDef(i = i.data) && isDef(i = i.registerRouteInstance)) {
          i(vm, callVal);
        }
      };
  
      Vue.mixin({
        beforeCreate: function beforeCreate () {
          if (isDef(this.$options.router)) {
            this._routerRoot = this;
            this._router = this.$options.router;
            this._router.init(this);
            Vue.util.defineReactive(this, '_route', this._router.history.current);
          } else {
            this._routerRoot = (this.$parent && this.$parent._routerRoot) || this;
          }
          registerInstance(this, this);
        },
        destroyed: function destroyed () {
          registerInstance(this);
        }
      });
  
      Object.defineProperty(Vue.prototype, '$router', {
        get: function get () { return this._routerRoot._router }
      });
  
      Object.defineProperty(Vue.prototype, '$route', {
        get: function get () { return this._routerRoot._route }
      });
  
      Vue.component('RouterView', View);
      Vue.component('RouterLink', Link);
  
      var strats = Vue.config.optionMergeStrategies;
      // use the same hook merging strategy for route hooks
      strats.beforeRouteEnter = strats.beforeRouteLeave = strats.beforeRouteUpdate = strats.created;
    }
  
    /*  */
  
    var inBrowser = typeof window !== 'undefined';
  
    /*  */
  
    function createRouteMap (
      routes,
      oldPathList,
      oldPathMap,
      oldNameMap,
      parentRoute
    ) {
      // the path list is used to control path matching priority
      var pathList = oldPathList || [];
      // $flow-disable-line
      var pathMap = oldPathMap || Object.create(null);
      // $flow-disable-line
      var nameMap = oldNameMap || Object.create(null);
  
      routes.forEach(function (route) {
        addRouteRecord(pathList, pathMap, nameMap, route, parentRoute);
      });
  
      // ensure wildcard routes are always at the end
      for (var i = 0, l = pathList.length; i < l; i++) {
        if (pathList[i] === '*') {
          pathList.push(pathList.splice(i, 1)[0]);
          l--;
          i--;
        }
      }
  
      {
        // warn if routes do not include leading slashes
        var found = pathList
        // check for missing leading slash
          .filter(function (path) { return path && path.charAt(0) !== '*' && path.charAt(0) !== '/'; });
  
        if (found.length > 0) {
          var pathNames = found.map(function (path) { return ("- " + path); }).join('\n');
          warn(false, ("Non-nested routes must include a leading slash character. Fix the following routes: \n" + pathNames));
        }
      }
  
      return {
        pathList: pathList,
        pathMap: pathMap,
        nameMap: nameMap
      }
    }
  
    function addRouteRecord (
      pathList,
      pathMap,
      nameMap,
      route,
      parent,
      matchAs
    ) {
      var path = route.path;
      var name = route.name;
      {
        assert(path != null, "\"path\" is required in a route configuration.");
        assert(
          typeof route.component !== 'string',
          "route config \"component\" for path: " + (String(
            path || name
          )) + " cannot be a " + "string id. Use an actual component instead."
        );
  
        warn(
          // eslint-disable-next-line no-control-regex
          !/[^\u0000-\u007F]+/.test(path),
          "Route with path \"" + path + "\" contains unencoded characters, make sure " +
            "your path is correctly encoded before passing it to the router. Use " +
            "encodeURI to encode static segments of your path."
        );
      }
  
      var pathToRegexpOptions =
        route.pathToRegexpOptions || {};
      var normalizedPath = normalizePath(path, parent, pathToRegexpOptions.strict);
  
      if (typeof route.caseSensitive === 'boolean') {
        pathToRegexpOptions.sensitive = route.caseSensitive;
      }
  
      var record = {
        path: normalizedPath,
        regex: compileRouteRegex(normalizedPath, pathToRegexpOptions),
        components: route.components || { default: route.component },
        alias: route.alias
          ? typeof route.alias === 'string'
            ? [route.alias]
            : route.alias
          : [],
        instances: {},
        enteredCbs: {},
        name: name,
        parent: parent,
        matchAs: matchAs,
        redirect: route.redirect,
        beforeEnter: route.beforeEnter,
        meta: route.meta || {},
        props:
          route.props == null
            ? {}
            : route.components
              ? route.props
              : { default: route.props }
      };
  
      if (route.children) {
        // Warn if route is named, does not redirect and has a default child route.
        // If users navigate to this route by name, the default child will
        // not be rendered (GH Issue #629)
        {
          if (
            route.name &&
            !route.redirect &&
            route.children.some(function (child) { return /^\/?$/.test(child.path); })
          ) {
            warn(
              false,
              "Named Route '" + (route.name) + "' has a default child route. " +
                "When navigating to this named route (:to=\"{name: '" + (route.name) + "'\"), " +
                "the default child route will not be rendered. Remove the name from " +
                "this route and use the name of the default child route for named " +
                "links instead."
            );
          }
        }
        route.children.forEach(function (child) {
          var childMatchAs = matchAs
            ? cleanPath((matchAs + "/" + (child.path)))
            : undefined;
          addRouteRecord(pathList, pathMap, nameMap, child, record, childMatchAs);
        });
      }
  
      if (!pathMap[record.path]) {
        pathList.push(record.path);
        pathMap[record.path] = record;
      }
  
      if (route.alias !== undefined) {
        var aliases = Array.isArray(route.alias) ? route.alias : [route.alias];
        for (var i = 0; i < aliases.length; ++i) {
          var alias = aliases[i];
          if (alias === path) {
            warn(
              false,
              ("Found an alias with the same value as the path: \"" + path + "\". You have to remove that alias. It will be ignored in development.")
            );
            // skip in dev to make it work
            continue
          }
  
          var aliasRoute = {
            path: alias,
            children: route.children
          };
          addRouteRecord(
            pathList,
            pathMap,
            nameMap,
            aliasRoute,
            parent,
            record.path || '/' // matchAs
          );
        }
      }
  
      if (name) {
        if (!nameMap[name]) {
          nameMap[name] = record;
        } else if (!matchAs) {
          warn(
            false,
            "Duplicate named routes definition: " +
              "{ name: \"" + name + "\", path: \"" + (record.path) + "\" }"
          );
        }
      }
    }
  
    function compileRouteRegex (
      path,
      pathToRegexpOptions
    ) {
      var regex = pathToRegexp_1(path, [], pathToRegexpOptions);
      {
        var keys = Object.create(null);
        regex.keys.forEach(function (key) {
          warn(
            !keys[key.name],
            ("Duplicate param keys in route with path: \"" + path + "\"")
          );
          keys[key.name] = true;
        });
      }
      return regex
    }
  
    function normalizePath (
      path,
      parent,
      strict
    ) {
      if (!strict) { path = path.replace(/\/$/, ''); }
      if (path[0] === '/') { return path }
      if (parent == null) { return path }
      return cleanPath(((parent.path) + "/" + path))
    }
  
    /*  */
  
  
  
    function createMatcher (
      routes,
      router
    ) {
      var ref = createRouteMap(routes);
      var pathList = ref.pathList;
      var pathMap = ref.pathMap;
      var nameMap = ref.nameMap;
  
      function addRoutes (routes) {
        createRouteMap(routes, pathList, pathMap, nameMap);
      }
  
      function addRoute (parentOrRoute, route) {
        var parent = (typeof parentOrRoute !== 'object') ? nameMap[parentOrRoute] : undefined;
        // $flow-disable-line
        createRouteMap([route || parentOrRoute], pathList, pathMap, nameMap, parent);
  
        // add aliases of parent
        if (parent && parent.alias.length) {
          createRouteMap(
            // $flow-disable-line route is defined if parent is
            parent.alias.map(function (alias) { return ({ path: alias, children: [route] }); }),
            pathList,
            pathMap,
            nameMap,
            parent
          );
        }
      }
  
      function getRoutes () {
        return pathList.map(function (path) { return pathMap[path]; })
      }
  
      function match (
        raw,
        currentRoute,
        redirectedFrom
      ) {
        var location = normalizeLocation(raw, currentRoute, false, router);
        var name = location.name;
  
        if (name) {
          var record = nameMap[name];
          {
            warn(record, ("Route with name '" + name + "' does not exist"));
          }
          if (!record) { return _createRoute(null, location) }
          var paramNames = record.regex.keys
            .filter(function (key) { return !key.optional; })
            .map(function (key) { return key.name; });
  
          if (typeof location.params !== 'object') {
            location.params = {};
          }
  
          if (currentRoute && typeof currentRoute.params === 'object') {
            for (var key in currentRoute.params) {
              if (!(key in location.params) && paramNames.indexOf(key) > -1) {
                location.params[key] = currentRoute.params[key];
              }
            }
          }
  
          location.path = fillParams(record.path, location.params, ("named route \"" + name + "\""));
          return _createRoute(record, location, redirectedFrom)
        } else if (location.path) {
          location.params = {};
          for (var i = 0; i < pathList.length; i++) {
            var path = pathList[i];
            var record$1 = pathMap[path];
            if (matchRoute(record$1.regex, location.path, location.params)) {
              return _createRoute(record$1, location, redirectedFrom)
            }
          }
        }
        // no match
        return _createRoute(null, location)
      }
  
      function redirect (
        record,
        location
      ) {
        var originalRedirect = record.redirect;
        var redirect = typeof originalRedirect === 'function'
          ? originalRedirect(createRoute(record, location, null, router))
          : originalRedirect;
  
        if (typeof redirect === 'string') {
          redirect = { path: redirect };
        }
  
        if (!redirect || typeof redirect !== 'object') {
          {
            warn(
              false, ("invalid redirect option: " + (JSON.stringify(redirect)))
            );
          }
          return _createRoute(null, location)
        }
  
        var re = redirect;
        var name = re.name;
        var path = re.path;
        var query = location.query;
        var hash = location.hash;
        var params = location.params;
        query = re.hasOwnProperty('query') ? re.query : query;
        hash = re.hasOwnProperty('hash') ? re.hash : hash;
        params = re.hasOwnProperty('params') ? re.params : params;
  
        if (name) {
          // resolved named direct
          var targetRecord = nameMap[name];
          {
            assert(targetRecord, ("redirect failed: named route \"" + name + "\" not found."));
          }
          return match({
            _normalized: true,
            name: name,
            query: query,
            hash: hash,
            params: params
          }, undefined, location)
        } else if (path) {
          // 1. resolve relative redirect
          var rawPath = resolveRecordPath(path, record);
          // 2. resolve params
          var resolvedPath = fillParams(rawPath, params, ("redirect route with path \"" + rawPath + "\""));
          // 3. rematch with existing query and hash
          return match({
            _normalized: true,
            path: resolvedPath,
            query: query,
            hash: hash
          }, undefined, location)
        } else {
          {
            warn(false, ("invalid redirect option: " + (JSON.stringify(redirect))));
          }
          return _createRoute(null, location)
        }
      }
  
      function alias (
        record,
        location,
        matchAs
      ) {
        var aliasedPath = fillParams(matchAs, location.params, ("aliased route with path \"" + matchAs + "\""));
        var aliasedMatch = match({
          _normalized: true,
          path: aliasedPath
        });
        if (aliasedMatch) {
          var matched = aliasedMatch.matched;
          var aliasedRecord = matched[matched.length - 1];
          location.params = aliasedMatch.params;
          return _createRoute(aliasedRecord, location)
        }
        return _createRoute(null, location)
      }
  
      function _createRoute (
        record,
        location,
        redirectedFrom
      ) {
        if (record && record.redirect) {
          return redirect(record, redirectedFrom || location)
        }
        if (record && record.matchAs) {
          return alias(record, location, record.matchAs)
        }
        return createRoute(record, location, redirectedFrom, router)
      }
  
      return {
        match: match,
        addRoute: addRoute,
        getRoutes: getRoutes,
        addRoutes: addRoutes
      }
    }
  
    function matchRoute (
      regex,
      path,
      params
    ) {
      var m = path.match(regex);
  
      if (!m) {
        return false
      } else if (!params) {
        return true
      }
  
      for (var i = 1, len = m.length; i < len; ++i) {
        var key = regex.keys[i - 1];
        if (key) {
          // Fix #1994: using * with props: true generates a param named 0
          params[key.name || 'pathMatch'] = typeof m[i] === 'string' ? decode(m[i]) : m[i];
        }
      }
  
      return true
    }
  
    function resolveRecordPath (path, record) {
      return resolvePath(path, record.parent ? record.parent.path : '/', true)
    }
  
    /*  */
  
    // use User Timing api (if present) for more accurate key precision
    var Time =
      inBrowser && window.performance && window.performance.now
        ? window.performance
        : Date;
  
    function genStateKey () {
      return Time.now().toFixed(3)
    }
  
    var _key = genStateKey();
  
    function getStateKey () {
      return _key
    }
  
    function setStateKey (key) {
      return (_key = key)
    }
  
    /*  */
  
    var positionStore = Object.create(null);
  
    function setupScroll () {
      // Prevent browser scroll behavior on History popstate
      if ('scrollRestoration' in window.history) {
        window.history.scrollRestoration = 'manual';
      }
      // Fix for #1585 for Firefox
      // Fix for #2195 Add optional third attribute to workaround a bug in safari https://bugs.webkit.org/show_bug.cgi?id=182678
      // Fix for #2774 Support for apps loaded from Windows file shares not mapped to network drives: replaced location.origin with
      // window.location.protocol + '//' + window.location.host
      // location.host contains the port and location.hostname doesn't
      var protocolAndPath = window.location.protocol + '//' + window.location.host;
      var absolutePath = window.location.href.replace(protocolAndPath, '');
      // preserve existing history state as it could be overriden by the user
      var stateCopy = extend({}, window.history.state);
      stateCopy.key = getStateKey();
      window.history.replaceState(stateCopy, '', absolutePath);
      window.addEventListener('popstate', handlePopState);
      return function () {
        window.removeEventListener('popstate', handlePopState);
      }
    }
  
    function handleScroll (
      router,
      to,
      from,
      isPop
    ) {
      if (!router.app) {
        return
      }
  
      var behavior = router.options.scrollBehavior;
      if (!behavior) {
        return
      }
  
      {
        assert(typeof behavior === 'function', "scrollBehavior must be a function");
      }
  
      // wait until re-render finishes before scrolling
      router.app.$nextTick(function () {
        var position = getScrollPosition();
        var shouldScroll = behavior.call(
          router,
          to,
          from,
          isPop ? position : null
        );
  
        if (!shouldScroll) {
          return
        }
  
        if (typeof shouldScroll.then === 'function') {
          shouldScroll
            .then(function (shouldScroll) {
              scrollToPosition((shouldScroll), position);
            })
            .catch(function (err) {
              {
                assert(false, err.toString());
              }
            });
        } else {
          scrollToPosition(shouldScroll, position);
        }
      });
    }
  
    function saveScrollPosition () {
      var key = getStateKey();
      if (key) {
        positionStore[key] = {
          x: window.pageXOffset,
          y: window.pageYOffset
        };
      }
    }
  
    function handlePopState (e) {
      saveScrollPosition();
      if (e.state && e.state.key) {
        setStateKey(e.state.key);
      }
    }
  
    function getScrollPosition () {
      var key = getStateKey();
      if (key) {
        return positionStore[key]
      }
    }
  
    function getElementPosition (el, offset) {
      var docEl = document.documentElement;
      var docRect = docEl.getBoundingClientRect();
      var elRect = el.getBoundingClientRect();
      return {
        x: elRect.left - docRect.left - offset.x,
        y: elRect.top - docRect.top - offset.y
      }
    }
  
    function isValidPosition (obj) {
      return isNumber(obj.x) || isNumber(obj.y)
    }
  
    function normalizePosition (obj) {
      return {
        x: isNumber(obj.x) ? obj.x : window.pageXOffset,
        y: isNumber(obj.y) ? obj.y : window.pageYOffset
      }
    }
  
    function normalizeOffset (obj) {
      return {
        x: isNumber(obj.x) ? obj.x : 0,
        y: isNumber(obj.y) ? obj.y : 0
      }
    }
  
    function isNumber (v) {
      return typeof v === 'number'
    }
  
    var hashStartsWithNumberRE = /^#\d/;
  
    function scrollToPosition (shouldScroll, position) {
      var isObject = typeof shouldScroll === 'object';
      if (isObject && typeof shouldScroll.selector === 'string') {
        // getElementById would still fail if the selector contains a more complicated query like #main[data-attr]
        // but at the same time, it doesn't make much sense to select an element with an id and an extra selector
        var el = hashStartsWithNumberRE.test(shouldScroll.selector) // $flow-disable-line
          ? document.getElementById(shouldScroll.selector.slice(1)) // $flow-disable-line
          : document.querySelector(shouldScroll.selector);
  
        if (el) {
          var offset =
            shouldScroll.offset && typeof shouldScroll.offset === 'object'
              ? shouldScroll.offset
              : {};
          offset = normalizeOffset(offset);
          position = getElementPosition(el, offset);
        } else if (isValidPosition(shouldScroll)) {
          position = normalizePosition(shouldScroll);
        }
      } else if (isObject && isValidPosition(shouldScroll)) {
        position = normalizePosition(shouldScroll);
      }
  
      if (position) {
        // $flow-disable-line
        if ('scrollBehavior' in document.documentElement.style) {
          window.scrollTo({
            left: position.x,
            top: position.y,
            // $flow-disable-line
            behavior: shouldScroll.behavior
          });
        } else {
          window.scrollTo(position.x, position.y);
        }
      }
    }
  
    /*  */
  
    var supportsPushState =
      inBrowser &&
      (function () {
        var ua = window.navigator.userAgent;
  
        if (
          (ua.indexOf('Android 2.') !== -1 || ua.indexOf('Android 4.0') !== -1) &&
          ua.indexOf('Mobile Safari') !== -1 &&
          ua.indexOf('Chrome') === -1 &&
          ua.indexOf('Windows Phone') === -1
        ) {
          return false
        }
  
        return window.history && typeof window.history.pushState === 'function'
      })();
  
    function pushState (url, replace) {
      saveScrollPosition();
      // try...catch the pushState call to get around Safari
      // DOM Exception 18 where it limits to 100 pushState calls
      var history = window.history;
      try {
        if (replace) {
          // preserve existing history state as it could be overriden by the user
          var stateCopy = extend({}, history.state);
          stateCopy.key = getStateKey();
          history.replaceState(stateCopy, '', url);
        } else {
          history.pushState({ key: setStateKey(genStateKey()) }, '', url);
        }
      } catch (e) {
        window.location[replace ? 'replace' : 'assign'](url);
      }
    }
  
    function replaceState (url) {
      pushState(url, true);
    }
  
    /*  */
  
    function runQueue (queue, fn, cb) {
      var step = function (index) {
        if (index >= queue.length) {
          cb();
        } else {
          if (queue[index]) {
            fn(queue[index], function () {
              step(index + 1);
            });
          } else {
            step(index + 1);
          }
        }
      };
      step(0);
    }
  
    // When changing thing, also edit router.d.ts
    var NavigationFailureType = {
      redirected: 2,
      aborted: 4,
      cancelled: 8,
      duplicated: 16
    };
  
    function createNavigationRedirectedError (from, to) {
      return createRouterError(
        from,
        to,
        NavigationFailureType.redirected,
        ("Redirected when going from \"" + (from.fullPath) + "\" to \"" + (stringifyRoute(
          to
        )) + "\" via a navigation guard.")
      )
    }
  
    function createNavigationDuplicatedError (from, to) {
      var error = createRouterError(
        from,
        to,
        NavigationFailureType.duplicated,
        ("Avoided redundant navigation to current location: \"" + (from.fullPath) + "\".")
      );
      // backwards compatible with the first introduction of Errors
      error.name = 'NavigationDuplicated';
      return error
    }
  
    function createNavigationCancelledError (from, to) {
      return createRouterError(
        from,
        to,
        NavigationFailureType.cancelled,
        ("Navigation cancelled from \"" + (from.fullPath) + "\" to \"" + (to.fullPath) + "\" with a new navigation.")
      )
    }
  
    function createNavigationAbortedError (from, to) {
      return createRouterError(
        from,
        to,
        NavigationFailureType.aborted,
        ("Navigation aborted from \"" + (from.fullPath) + "\" to \"" + (to.fullPath) + "\" via a navigation guard.")
      )
    }
  
    function createRouterError (from, to, type, message) {
      var error = new Error(message);
      error._isRouter = true;
      error.from = from;
      error.to = to;
      error.type = type;
  
      return error
    }
  
    var propertiesToLog = ['params', 'query', 'hash'];
  
    function stringifyRoute (to) {
      if (typeof to === 'string') { return to }
      if ('path' in to) { return to.path }
      var location = {};
      propertiesToLog.forEach(function (key) {
        if (key in to) { location[key] = to[key]; }
      });
      return JSON.stringify(location, null, 2)
    }
  
    function isError (err) {
      return Object.prototype.toString.call(err).indexOf('Error') > -1
    }
  
    function isNavigationFailure (err, errorType) {
      return (
        isError(err) &&
        err._isRouter &&
        (errorType == null || err.type === errorType)
      )
    }
  
    /*  */
  
    function resolveAsyncComponents (matched) {
      return function (to, from, next) {
        var hasAsync = false;
        var pending = 0;
        var error = null;
  
        flatMapComponents(matched, function (def, _, match, key) {
          // if it's a function and doesn't have cid attached,
          // assume it's an async component resolve function.
          // we are not using Vue's default async resolving mechanism because
          // we want to halt the navigation until the incoming component has been
          // resolved.
          if (typeof def === 'function' && def.cid === undefined) {
            hasAsync = true;
            pending++;
  
            var resolve = once(function (resolvedDef) {
              if (isESModule(resolvedDef)) {
                resolvedDef = resolvedDef.default;
              }
              // save resolved on async factory in case it's used elsewhere
              def.resolved = typeof resolvedDef === 'function'
                ? resolvedDef
                : _Vue.extend(resolvedDef);
              match.components[key] = resolvedDef;
              pending--;
              if (pending <= 0) {
                next();
              }
            });
  
            var reject = once(function (reason) {
              var msg = "Failed to resolve async component " + key + ": " + reason;
              warn(false, msg);
              if (!error) {
                error = isError(reason)
                  ? reason
                  : new Error(msg);
                next(error);
              }
            });
  
            var res;
            try {
              res = def(resolve, reject);
            } catch (e) {
              reject(e);
            }
            if (res) {
              if (typeof res.then === 'function') {
                res.then(resolve, reject);
              } else {
                // new syntax in Vue 2.3
                var comp = res.component;
                if (comp && typeof comp.then === 'function') {
                  comp.then(resolve, reject);
                }
              }
            }
          }
        });
  
        if (!hasAsync) { next(); }
      }
    }
  
    function flatMapComponents (
      matched,
      fn
    ) {
      return flatten(matched.map(function (m) {
        return Object.keys(m.components).map(function (key) { return fn(
          m.components[key],
          m.instances[key],
          m, key
        ); })
      }))
    }
  
    function flatten (arr) {
      return Array.prototype.concat.apply([], arr)
    }
  
    var hasSymbol =
      typeof Symbol === 'function' &&
      typeof Symbol.toStringTag === 'symbol';
  
    function isESModule (obj) {
      return obj.__esModule || (hasSymbol && obj[Symbol.toStringTag] === 'Module')
    }
  
    // in Webpack 2, require.ensure now also returns a Promise
    // so the resolve/reject functions may get called an extra time
    // if the user uses an arrow function shorthand that happens to
    // return that Promise.
    function once (fn) {
      var called = false;
      return function () {
        var args = [], len = arguments.length;
        while ( len-- ) args[ len ] = arguments[ len ];
  
        if (called) { return }
        called = true;
        return fn.apply(this, args)
      }
    }
  
    /*  */
  
    var History = function History (router, base) {
      this.router = router;
      this.base = normalizeBase(base);
      // start with a route object that stands for "nowhere"
      this.current = START;
      this.pending = null;
      this.ready = false;
      this.readyCbs = [];
      this.readyErrorCbs = [];
      this.errorCbs = [];
      this.listeners = [];
    };
  
    History.prototype.listen = function listen (cb) {
      this.cb = cb;
    };
  
    History.prototype.onReady = function onReady (cb, errorCb) {
      if (this.ready) {
        cb();
      } else {
        this.readyCbs.push(cb);
        if (errorCb) {
          this.readyErrorCbs.push(errorCb);
        }
      }
    };
  
    History.prototype.onError = function onError (errorCb) {
      this.errorCbs.push(errorCb);
    };
  
    History.prototype.transitionTo = function transitionTo (
      location,
      onComplete,
      onAbort
    ) {
        var this$1 = this;
  
      var route;
      // catch redirect option https://github.com/vuejs/vue-router/issues/3201
      try {
        route = this.router.match(location, this.current);
      } catch (e) {
        this.errorCbs.forEach(function (cb) {
          cb(e);
        });
        // Exception should still be thrown
        throw e
      }
      var prev = this.current;
      this.confirmTransition(
        route,
        function () {
          this$1.updateRoute(route);
          onComplete && onComplete(route);
          this$1.ensureURL();
          this$1.router.afterHooks.forEach(function (hook) {
            hook && hook(route, prev);
          });
  
          // fire ready cbs once
          if (!this$1.ready) {
            this$1.ready = true;
            this$1.readyCbs.forEach(function (cb) {
              cb(route);
            });
          }
        },
        function (err) {
          if (onAbort) {
            onAbort(err);
          }
          if (err && !this$1.ready) {
            // Initial redirection should not mark the history as ready yet
            // because it's triggered by the redirection instead
            // https://github.com/vuejs/vue-router/issues/3225
            // https://github.com/vuejs/vue-router/issues/3331
            if (!isNavigationFailure(err, NavigationFailureType.redirected) || prev !== START) {
              this$1.ready = true;
              this$1.readyErrorCbs.forEach(function (cb) {
                cb(err);
              });
            }
          }
        }
      );
    };
  
    History.prototype.confirmTransition = function confirmTransition (route, onComplete, onAbort) {
        var this$1 = this;
  
      var current = this.current;
      this.pending = route;
      var abort = function (err) {
        // changed after adding errors with
        // https://github.com/vuejs/vue-router/pull/3047 before that change,
        // redirect and aborted navigation would produce an err == null
        if (!isNavigationFailure(err) && isError(err)) {
          if (this$1.errorCbs.length) {
            this$1.errorCbs.forEach(function (cb) {
              cb(err);
            });
          } else {
            {
              warn(false, 'uncaught error during route navigation:');
            }
            console.error(err);
          }
        }
        onAbort && onAbort(err);
      };
      var lastRouteIndex = route.matched.length - 1;
      var lastCurrentIndex = current.matched.length - 1;
      if (
        isSameRoute(route, current) &&
        // in the case the route map has been dynamically appended to
        lastRouteIndex === lastCurrentIndex &&
        route.matched[lastRouteIndex] === current.matched[lastCurrentIndex]
      ) {
        this.ensureURL();
        if (route.hash) {
          handleScroll(this.router, current, route, false);
        }
        return abort(createNavigationDuplicatedError(current, route))
      }
  
      var ref = resolveQueue(
        this.current.matched,
        route.matched
      );
        var updated = ref.updated;
        var deactivated = ref.deactivated;
        var activated = ref.activated;
  
      var queue = [].concat(
        // in-component leave guards
        extractLeaveGuards(deactivated),
        // global before hooks
        this.router.beforeHooks,
        // in-component update hooks
        extractUpdateHooks(updated),
        // in-config enter guards
        activated.map(function (m) { return m.beforeEnter; }),
        // async components
        resolveAsyncComponents(activated)
      );
  
      var iterator = function (hook, next) {
        if (this$1.pending !== route) {
          return abort(createNavigationCancelledError(current, route))
        }
        try {
          hook(route, current, function (to) {
            if (to === false) {
              // next(false) -> abort navigation, ensure current URL
              this$1.ensureURL(true);
              abort(createNavigationAbortedError(current, route));
            } else if (isError(to)) {
              this$1.ensureURL(true);
              abort(to);
            } else if (
              typeof to === 'string' ||
              (typeof to === 'object' &&
                (typeof to.path === 'string' || typeof to.name === 'string'))
            ) {
              // next('/') or next({ path: '/' }) -> redirect
              abort(createNavigationRedirectedError(current, route));
              if (typeof to === 'object' && to.replace) {
                this$1.replace(to);
              } else {
                this$1.push(to);
              }
            } else {
              // confirm transition and pass on the value
              next(to);
            }
          });
        } catch (e) {
          abort(e);
        }
      };
  
      runQueue(queue, iterator, function () {
        // wait until async components are resolved before
        // extracting in-component enter guards
        var enterGuards = extractEnterGuards(activated);
        var queue = enterGuards.concat(this$1.router.resolveHooks);
        runQueue(queue, iterator, function () {
          if (this$1.pending !== route) {
            return abort(createNavigationCancelledError(current, route))
          }
          this$1.pending = null;
          onComplete(route);
          if (this$1.router.app) {
            this$1.router.app.$nextTick(function () {
              handleRouteEntered(route);
            });
          }
        });
      });
    };
  
    History.prototype.updateRoute = function updateRoute (route) {
      this.current = route;
      this.cb && this.cb(route);
    };
  
    History.prototype.setupListeners = function setupListeners () {
      // Default implementation is empty
    };
  
    History.prototype.teardown = function teardown () {
      // clean up event listeners
      // https://github.com/vuejs/vue-router/issues/2341
      this.listeners.forEach(function (cleanupListener) {
        cleanupListener();
      });
      this.listeners = [];
  
      // reset current history route
      // https://github.com/vuejs/vue-router/issues/3294
      this.current = START;
      this.pending = null;
    };
  
    function normalizeBase (base) {
      if (!base) {
        if (inBrowser) {
          // respect <base> tag
          var baseEl = document.querySelector('base');
          base = (baseEl && baseEl.getAttribute('href')) || '/';
          // strip full URL origin
          base = base.replace(/^https?:\/\/[^\/]+/, '');
        } else {
          base = '/';
        }
      }
      // make sure there's the starting slash
      if (base.charAt(0) !== '/') {
        base = '/' + base;
      }
      // remove trailing slash
      return base.replace(/\/$/, '')
    }
  
    function resolveQueue (
      current,
      next
    ) {
      var i;
      var max = Math.max(current.length, next.length);
      for (i = 0; i < max; i++) {
        if (current[i] !== next[i]) {
          break
        }
      }
      return {
        updated: next.slice(0, i),
        activated: next.slice(i),
        deactivated: current.slice(i)
      }
    }
  
    function extractGuards (
      records,
      name,
      bind,
      reverse
    ) {
      var guards = flatMapComponents(records, function (def, instance, match, key) {
        var guard = extractGuard(def, name);
        if (guard) {
          return Array.isArray(guard)
            ? guard.map(function (guard) { return bind(guard, instance, match, key); })
            : bind(guard, instance, match, key)
        }
      });
      return flatten(reverse ? guards.reverse() : guards)
    }
  
    function extractGuard (
      def,
      key
    ) {
      if (typeof def !== 'function') {
        // extend now so that global mixins are applied.
        def = _Vue.extend(def);
      }
      return def.options[key]
    }
  
    function extractLeaveGuards (deactivated) {
      return extractGuards(deactivated, 'beforeRouteLeave', bindGuard, true)
    }
  
    function extractUpdateHooks (updated) {
      return extractGuards(updated, 'beforeRouteUpdate', bindGuard)
    }
  
    function bindGuard (guard, instance) {
      if (instance) {
        return function boundRouteGuard () {
          return guard.apply(instance, arguments)
        }
      }
    }
  
    function extractEnterGuards (
      activated
    ) {
      return extractGuards(
        activated,
        'beforeRouteEnter',
        function (guard, _, match, key) {
          return bindEnterGuard(guard, match, key)
        }
      )
    }
  
    function bindEnterGuard (
      guard,
      match,
      key
    ) {
      return function routeEnterGuard (to, from, next) {
        return guard(to, from, function (cb) {
          if (typeof cb === 'function') {
            if (!match.enteredCbs[key]) {
              match.enteredCbs[key] = [];
            }
            match.enteredCbs[key].push(cb);
          }
          next(cb);
        })
      }
    }
  
    /*  */
  
    var HTML5History = /*@__PURE__*/(function (History) {
      function HTML5History (router, base) {
        History.call(this, router, base);
  
        this._startLocation = getLocation(this.base);
      }
  
      if ( History ) HTML5History.__proto__ = History;
      HTML5History.prototype = Object.create( History && History.prototype );
      HTML5History.prototype.constructor = HTML5History;
  
      HTML5History.prototype.setupListeners = function setupListeners () {
        var this$1 = this;
  
        if (this.listeners.length > 0) {
          return
        }
  
        var router = this.router;
        var expectScroll = router.options.scrollBehavior;
        var supportsScroll = supportsPushState && expectScroll;
  
        if (supportsScroll) {
          this.listeners.push(setupScroll());
        }
  
        var handleRoutingEvent = function () {
          var current = this$1.current;
  
          // Avoiding first `popstate` event dispatched in some browsers but first
          // history route not updated since async guard at the same time.
          var location = getLocation(this$1.base);
          if (this$1.current === START && location === this$1._startLocation) {
            return
          }
  
          this$1.transitionTo(location, function (route) {
            if (supportsScroll) {
              handleScroll(router, route, current, true);
            }
          });
        };
        window.addEventListener('popstate', handleRoutingEvent);
        this.listeners.push(function () {
          window.removeEventListener('popstate', handleRoutingEvent);
        });
      };
  
      HTML5History.prototype.go = function go (n) {
        window.history.go(n);
      };
  
      HTML5History.prototype.push = function push (location, onComplete, onAbort) {
        var this$1 = this;
  
        var ref = this;
        var fromRoute = ref.current;
        this.transitionTo(location, function (route) {
          pushState(cleanPath(this$1.base + route.fullPath));
          handleScroll(this$1.router, route, fromRoute, false);
          onComplete && onComplete(route);
        }, onAbort);
      };
  
      HTML5History.prototype.replace = function replace (location, onComplete, onAbort) {
        var this$1 = this;
  
        var ref = this;
        var fromRoute = ref.current;
        this.transitionTo(location, function (route) {
          replaceState(cleanPath(this$1.base + route.fullPath));
          handleScroll(this$1.router, route, fromRoute, false);
          onComplete && onComplete(route);
        }, onAbort);
      };
  
      HTML5History.prototype.ensureURL = function ensureURL (push) {
        if (getLocation(this.base) !== this.current.fullPath) {
          var current = cleanPath(this.base + this.current.fullPath);
          push ? pushState(current) : replaceState(current);
        }
      };
  
      HTML5History.prototype.getCurrentLocation = function getCurrentLocation () {
        return getLocation(this.base)
      };
  
      return HTML5History;
    }(History));
  
    function getLocation (base) {
      var path = window.location.pathname;
      var pathLowerCase = path.toLowerCase();
      var baseLowerCase = base.toLowerCase();
      // base="/a" shouldn't turn path="/app" into "/a/pp"
      // https://github.com/vuejs/vue-router/issues/3555
      // so we ensure the trailing slash in the base
      if (base && ((pathLowerCase === baseLowerCase) ||
        (pathLowerCase.indexOf(cleanPath(baseLowerCase + '/')) === 0))) {
        path = path.slice(base.length);
      }
      return (path || '/') + window.location.search + window.location.hash
    }
  
    /*  */
  
    var HashHistory = /*@__PURE__*/(function (History) {
      function HashHistory (router, base, fallback) {
        History.call(this, router, base);
        // check history fallback deeplinking
        if (fallback && checkFallback(this.base)) {
          return
        }
        ensureSlash();
      }
  
      if ( History ) HashHistory.__proto__ = History;
      HashHistory.prototype = Object.create( History && History.prototype );
      HashHistory.prototype.constructor = HashHistory;
  
      // this is delayed until the app mounts
      // to avoid the hashchange listener being fired too early
      HashHistory.prototype.setupListeners = function setupListeners () {
        var this$1 = this;
  
        if (this.listeners.length > 0) {
          return
        }
  
        var router = this.router;
        var expectScroll = router.options.scrollBehavior;
        var supportsScroll = supportsPushState && expectScroll;
  
        if (supportsScroll) {
          this.listeners.push(setupScroll());
        }
  
        var handleRoutingEvent = function () {
          var current = this$1.current;
          if (!ensureSlash()) {
            return
          }
          this$1.transitionTo(getHash(), function (route) {
            if (supportsScroll) {
              handleScroll(this$1.router, route, current, true);
            }
            if (!supportsPushState) {
              replaceHash(route.fullPath);
            }
          });
        };
        var eventType = supportsPushState ? 'popstate' : 'hashchange';
        window.addEventListener(
          eventType,
          handleRoutingEvent
        );
        this.listeners.push(function () {
          window.removeEventListener(eventType, handleRoutingEvent);
        });
      };
  
      HashHistory.prototype.push = function push (location, onComplete, onAbort) {
        var this$1 = this;
  
        var ref = this;
        var fromRoute = ref.current;
        this.transitionTo(
          location,
          function (route) {
            pushHash(route.fullPath);
            handleScroll(this$1.router, route, fromRoute, false);
            onComplete && onComplete(route);
          },
          onAbort
        );
      };
  
      HashHistory.prototype.replace = function replace (location, onComplete, onAbort) {
        var this$1 = this;
  
        var ref = this;
        var fromRoute = ref.current;
        this.transitionTo(
          location,
          function (route) {
            replaceHash(route.fullPath);
            handleScroll(this$1.router, route, fromRoute, false);
            onComplete && onComplete(route);
          },
          onAbort
        );
      };
  
      HashHistory.prototype.go = function go (n) {
        window.history.go(n);
      };
  
      HashHistory.prototype.ensureURL = function ensureURL (push) {
        var current = this.current.fullPath;
        if (getHash() !== current) {
          push ? pushHash(current) : replaceHash(current);
        }
      };
  
      HashHistory.prototype.getCurrentLocation = function getCurrentLocation () {
        return getHash()
      };
  
      return HashHistory;
    }(History));
  
    function checkFallback (base) {
      var location = getLocation(base);
      if (!/^\/#/.test(location)) {
        window.location.replace(cleanPath(base + '/#' + location));
        return true
      }
    }
  
    function ensureSlash () {
      var path = getHash();
      if (path.charAt(0) === '/') {
        return true
      }
      replaceHash('/' + path);
      return false
    }
  
    function getHash () {
      // We can't use window.location.hash here because it's not
      // consistent across browsers - Firefox will pre-decode it!
      var href = window.location.href;
      var index = href.indexOf('#');
      // empty path
      if (index < 0) { return '' }
  
      href = href.slice(index + 1);
  
      return href
    }
  
    function getUrl (path) {
      var href = window.location.href;
      var i = href.indexOf('#');
      var base = i >= 0 ? href.slice(0, i) : href;
      return (base + "#" + path)
    }
  
    function pushHash (path) {
      if (supportsPushState) {
        pushState(getUrl(path));
      } else {
        window.location.hash = path;
      }
    }
  
    function replaceHash (path) {
      if (supportsPushState) {
        replaceState(getUrl(path));
      } else {
        window.location.replace(getUrl(path));
      }
    }
  
    /*  */
  
    var AbstractHistory = /*@__PURE__*/(function (History) {
      function AbstractHistory (router, base) {
        History.call(this, router, base);
        this.stack = [];
        this.index = -1;
      }
  
      if ( History ) AbstractHistory.__proto__ = History;
      AbstractHistory.prototype = Object.create( History && History.prototype );
      AbstractHistory.prototype.constructor = AbstractHistory;
  
      AbstractHistory.prototype.push = function push (location, onComplete, onAbort) {
        var this$1 = this;
  
        this.transitionTo(
          location,
          function (route) {
            this$1.stack = this$1.stack.slice(0, this$1.index + 1).concat(route);
            this$1.index++;
            onComplete && onComplete(route);
          },
          onAbort
        );
      };
  
      AbstractHistory.prototype.replace = function replace (location, onComplete, onAbort) {
        var this$1 = this;
  
        this.transitionTo(
          location,
          function (route) {
            this$1.stack = this$1.stack.slice(0, this$1.index).concat(route);
            onComplete && onComplete(route);
          },
          onAbort
        );
      };
  
      AbstractHistory.prototype.go = function go (n) {
        var this$1 = this;
  
        var targetIndex = this.index + n;
        if (targetIndex < 0 || targetIndex >= this.stack.length) {
          return
        }
        var route = this.stack[targetIndex];
        this.confirmTransition(
          route,
          function () {
            var prev = this$1.current;
            this$1.index = targetIndex;
            this$1.updateRoute(route);
            this$1.router.afterHooks.forEach(function (hook) {
              hook && hook(route, prev);
            });
          },
          function (err) {
            if (isNavigationFailure(err, NavigationFailureType.duplicated)) {
              this$1.index = targetIndex;
            }
          }
        );
      };
  
      AbstractHistory.prototype.getCurrentLocation = function getCurrentLocation () {
        var current = this.stack[this.stack.length - 1];
        return current ? current.fullPath : '/'
      };
  
      AbstractHistory.prototype.ensureURL = function ensureURL () {
        // noop
      };
  
      return AbstractHistory;
    }(History));
  
    /*  */
  
    var VueRouter = function VueRouter (options) {
      if ( options === void 0 ) options = {};
  
      {
        warn(this instanceof VueRouter, "Router must be called with the new operator.");
      }
      this.app = null;
      this.apps = [];
      this.options = options;
      this.beforeHooks = [];
      this.resolveHooks = [];
      this.afterHooks = [];
      this.matcher = createMatcher(options.routes || [], this);
  
      var mode = options.mode || 'hash';
      this.fallback =
        mode === 'history' && !supportsPushState && options.fallback !== false;
      if (this.fallback) {
        mode = 'hash';
      }
      if (!inBrowser) {
        mode = 'abstract';
      }
      this.mode = mode;
  
      switch (mode) {
        case 'history':
          this.history = new HTML5History(this, options.base);
          break
        case 'hash':
          this.history = new HashHistory(this, options.base, this.fallback);
          break
        case 'abstract':
          this.history = new AbstractHistory(this, options.base);
          break
        default:
          {
            assert(false, ("invalid mode: " + mode));
          }
      }
    };
  
    var prototypeAccessors = { currentRoute: { configurable: true } };
  
    VueRouter.prototype.match = function match (raw, current, redirectedFrom) {
      return this.matcher.match(raw, current, redirectedFrom)
    };
  
    prototypeAccessors.currentRoute.get = function () {
      return this.history && this.history.current
    };
  
    VueRouter.prototype.init = function init (app /* Vue component instance */) {
        var this$1 = this;
  
      assert(
          install.installed,
          "not installed. Make sure to call `Vue.use(VueRouter)` " +
            "before creating root instance."
        );
  
      this.apps.push(app);
  
      // set up app destroyed handler
      // https://github.com/vuejs/vue-router/issues/2639
      app.$once('hook:destroyed', function () {
        // clean out app from this.apps array once destroyed
        var index = this$1.apps.indexOf(app);
        if (index > -1) { this$1.apps.splice(index, 1); }
        // ensure we still have a main app or null if no apps
        // we do not release the router so it can be reused
        if (this$1.app === app) { this$1.app = this$1.apps[0] || null; }
  
        if (!this$1.app) { this$1.history.teardown(); }
      });
  
      // main app previously initialized
      // return as we don't need to set up new history listener
      if (this.app) {
        return
      }
  
      this.app = app;
  
      var history = this.history;
  
      if (history instanceof HTML5History || history instanceof HashHistory) {
        var handleInitialScroll = function (routeOrError) {
          var from = history.current;
          var expectScroll = this$1.options.scrollBehavior;
          var supportsScroll = supportsPushState && expectScroll;
  
          if (supportsScroll && 'fullPath' in routeOrError) {
            handleScroll(this$1, routeOrError, from, false);
          }
        };
        var setupListeners = function (routeOrError) {
          history.setupListeners();
          handleInitialScroll(routeOrError);
        };
        history.transitionTo(
          history.getCurrentLocation(),
          setupListeners,
          setupListeners
        );
      }
  
      history.listen(function (route) {
        this$1.apps.forEach(function (app) {
          app._route = route;
        });
      });
    };
  
    VueRouter.prototype.beforeEach = function beforeEach (fn) {
      return registerHook(this.beforeHooks, fn)
    };
  
    VueRouter.prototype.beforeResolve = function beforeResolve (fn) {
      return registerHook(this.resolveHooks, fn)
    };
  
    VueRouter.prototype.afterEach = function afterEach (fn) {
      return registerHook(this.afterHooks, fn)
    };
  
    VueRouter.prototype.onReady = function onReady (cb, errorCb) {
      this.history.onReady(cb, errorCb);
    };
  
    VueRouter.prototype.onError = function onError (errorCb) {
      this.history.onError(errorCb);
    };
  
    VueRouter.prototype.push = function push (location, onComplete, onAbort) {
        var this$1 = this;
  
      // $flow-disable-line
      if (!onComplete && !onAbort && typeof Promise !== 'undefined') {
        return new Promise(function (resolve, reject) {
          this$1.history.push(location, resolve, reject);
        })
      } else {
        this.history.push(location, onComplete, onAbort);
      }
    };
  
    VueRouter.prototype.replace = function replace (location, onComplete, onAbort) {
        var this$1 = this;
  
      // $flow-disable-line
      if (!onComplete && !onAbort && typeof Promise !== 'undefined') {
        return new Promise(function (resolve, reject) {
          this$1.history.replace(location, resolve, reject);
        })
      } else {
        this.history.replace(location, onComplete, onAbort);
      }
    };
  
    VueRouter.prototype.go = function go (n) {
      this.history.go(n);
    };
  
    VueRouter.prototype.back = function back () {
      this.go(-1);
    };
  
    VueRouter.prototype.forward = function forward () {
      this.go(1);
    };
  
    VueRouter.prototype.getMatchedComponents = function getMatchedComponents (to) {
      var route = to
        ? to.matched
          ? to
          : this.resolve(to).route
        : this.currentRoute;
      if (!route) {
        return []
      }
      return [].concat.apply(
        [],
        route.matched.map(function (m) {
          return Object.keys(m.components).map(function (key) {
            return m.components[key]
          })
        })
      )
    };
  
    VueRouter.prototype.resolve = function resolve (
      to,
      current,
      append
    ) {
      current = current || this.history.current;
      var location = normalizeLocation(to, current, append, this);
      var route = this.match(location, current);
      var fullPath = route.redirectedFrom || route.fullPath;
      var base = this.history.base;
      var href = createHref(base, fullPath, this.mode);
      return {
        location: location,
        route: route,
        href: href,
        // for backwards compat
        normalizedTo: location,
        resolved: route
      }
    };
  
    VueRouter.prototype.getRoutes = function getRoutes () {
      return this.matcher.getRoutes()
    };
  
    VueRouter.prototype.addRoute = function addRoute (parentOrRoute, route) {
      this.matcher.addRoute(parentOrRoute, route);
      if (this.history.current !== START) {
        this.history.transitionTo(this.history.getCurrentLocation());
      }
    };
  
    VueRouter.prototype.addRoutes = function addRoutes (routes) {
      {
        warn(false, 'router.addRoutes() is deprecated and has been removed in Vue Router 4. Use router.addRoute() instead.');
      }
      this.matcher.addRoutes(routes);
      if (this.history.current !== START) {
        this.history.transitionTo(this.history.getCurrentLocation());
      }
    };
  
    Object.defineProperties( VueRouter.prototype, prototypeAccessors );
  
    function registerHook (list, fn) {
      list.push(fn);
      return function () {
        var i = list.indexOf(fn);
        if (i > -1) { list.splice(i, 1); }
      }
    }
  
    function createHref (base, fullPath, mode) {
      var path = mode === 'hash' ? '#' + fullPath : fullPath;
      return base ? cleanPath(base + '/' + path) : path
    }
  
    VueRouter.install = install;
    VueRouter.version = '3.5.3';
    VueRouter.isNavigationFailure = isNavigationFailure;
    VueRouter.NavigationFailureType = NavigationFailureType;
    VueRouter.START_LOCATION = START;
  
    if (inBrowser && window.Vue) {
      window.Vue.use(VueRouter);
    }
  
    return VueRouter;
  
  })));