Merge branch 'dev' into 4.0

# Conflicts:
#	CHANGELOG.md
#	dist/logger.js
#	dist/vuex.common.js
#	dist/vuex.esm.browser.js
#	dist/vuex.esm.browser.min.js
#	dist/vuex.esm.js
#	dist/vuex.js
#	dist/vuex.min.js
#	package.json
#	test/e2e/cart.spec.js
#	test/e2e/chat.spec.js
#	test/e2e/counter.spec.js
#	test/e2e/todomvc.spec.js
#	test/helpers.js
#	yarn.lock

dist/logger.js

@@ -0,0 +1,155 @@
+/*!
+ * vuex v3.4.0
+ * (c) 2020 Evan You
+ * @license MIT
+ */
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global = global || self, global.Vuex = factory());
+}(this, (function () { 'use strict';
+
+  /**
+   * Get the first item that pass the test
+   * by second argument function
+   *
+   * @param {Array} list
+   * @param {Function} f
+   * @return {*}
+   */
+  function find (list, f) {
+    return list.filter(f)[0]
+  }
+
+  /**
+   * Deep copy the given object considering circular structure.
+   * This function caches all nested objects and its copies.
+   * If it detects circular structure, use cached copy to avoid infinite loop.
+   *
+   * @param {*} obj
+   * @param {Array<Object>} cache
+   * @return {*}
+   */
+  function deepCopy (obj, cache) {
+    if ( cache === void 0 ) cache = [];
+
+    // just return if obj is immutable value
+    if (obj === null || typeof obj !== 'object') {
+      return obj
+    }
+
+    // if obj is hit, it is in circular structure
+    var hit = find(cache, function (c) { return c.original === obj; });
+    if (hit) {
+      return hit.copy
+    }
+
+    var copy = Array.isArray(obj) ? [] : {};
+    // put the copy into cache at first
+    // because we want to refer it in recursive deepCopy
+    cache.push({
+      original: obj,
+      copy: copy
+    });
+
+    Object.keys(obj).forEach(function (key) {
+      copy[key] = deepCopy(obj[key], cache);
+    });
+
+    return copy
+  }
+
+  // Credits: borrowed code from fcomb/redux-logger
+
+  function createLogger (ref) {
+    if ( ref === void 0 ) ref = {};
+    var collapsed = ref.collapsed; if ( collapsed === void 0 ) collapsed = true;
+    var filter = ref.filter; if ( filter === void 0 ) filter = function (mutation, stateBefore, stateAfter) { return true; };
+    var transformer = ref.transformer; if ( transformer === void 0 ) transformer = function (state) { return state; };
+    var mutationTransformer = ref.mutationTransformer; if ( mutationTransformer === void 0 ) mutationTransformer = function (mut) { return mut; };
+    var actionFilter = ref.actionFilter; if ( actionFilter === void 0 ) actionFilter = function (action, state) { return true; };
+    var actionTransformer = ref.actionTransformer; if ( actionTransformer === void 0 ) actionTransformer = function (act) { return act; };
+    var logMutations = ref.logMutations; if ( logMutations === void 0 ) logMutations = true;
+    var logActions = ref.logActions; if ( logActions === void 0 ) logActions = true;
+    var logger = ref.logger; if ( logger === void 0 ) logger = console;
+
+    return function (store) {
+      var prevState = deepCopy(store.state);
+
+      if (typeof logger === 'undefined') {
+        return
+      }
+
+      if (logMutations) {
+        store.subscribe(function (mutation, state) {
+          var nextState = deepCopy(state);
+
+          if (filter(mutation, prevState, nextState)) {
+            var formattedTime = getFormattedTime();
+            var formattedMutation = mutationTransformer(mutation);
+            var message = "mutation " + (mutation.type) + formattedTime;
+
+            startMessage(logger, message, collapsed);
+            logger.log('%c prev state', 'color: #9E9E9E; font-weight: bold', transformer(prevState));
+            logger.log('%c mutation', 'color: #03A9F4; font-weight: bold', formattedMutation);
+            logger.log('%c next state', 'color: #4CAF50; font-weight: bold', transformer(nextState));
+            endMessage(logger);
+          }
+
+          prevState = nextState;
+        });
+      }
+
+      if (logActions) {
+        store.subscribeAction(function (action, state) {
+          if (actionFilter(action, state)) {
+            var formattedTime = getFormattedTime();
+            var formattedAction = actionTransformer(action);
+            var message = "action " + (action.type) + formattedTime;
+
+            startMessage(logger, message, collapsed);
+            logger.log('%c action', 'color: #03A9F4; font-weight: bold', formattedAction);
+            endMessage(logger);
+          }
+        });
+      }
+    }
+  }
+
+  function startMessage (logger, message, collapsed) {
+    var startMessage = collapsed
+      ? logger.groupCollapsed
+      : logger.group;
+
+    // render
+    try {
+      startMessage.call(logger, message);
+    } catch (e) {
+      logger.log(message);
+    }
+  }
+
+  function endMessage (logger) {
+    try {
+      logger.groupEnd();
+    } catch (e) {
+      logger.log('—— log end ——');
+    }
+  }
+
+  function getFormattedTime () {
+    var time = new Date();
+    return (" @ " + (pad(time.getHours(), 2)) + ":" + (pad(time.getMinutes(), 2)) + ":" + (pad(time.getSeconds(), 2)) + "." + (pad(time.getMilliseconds(), 3)))
+  }
+
+  function repeat (str, times) {
+    return (new Array(times + 1)).join(str)
+  }
+
+  function pad (num, maxLength) {
+    return repeat('0', maxLength - num.toString().length) + num
+  }
+
+  return createLogger;
+
+})));

dist/vuex.common.js

@@ -0,0 +1,1093 @@
+/*!
+ * vuex v3.4.0
+ * (c) 2020 Evan You
+ * @license MIT
+ */
+'use strict';
+
+function applyMixin (Vue) {
+  var version = Number(Vue.version.split('.')[0]);
+
+  if (version >= 2) {
+    Vue.mixin({ beforeCreate: vuexInit });
+  } else {
+    // override init and inject vuex init procedure
+    // for 1.x backwards compatibility.
+    var _init = Vue.prototype._init;
+    Vue.prototype._init = function (options) {
+      if ( options === void 0 ) options = {};
+
+      options.init = options.init
+        ? [vuexInit].concat(options.init)
+        : vuexInit;
+      _init.call(this, options);
+    };
+  }
+
+  /**
+   * Vuex init hook, injected into each instances init hooks list.
+   */
+
+  function vuexInit () {
+    var options = this.$options;
+    // store injection
+    if (options.store) {
+      this.$store = typeof options.store === 'function'
+        ? options.store()
+        : options.store;
+    } else if (options.parent && options.parent.$store) {
+      this.$store = options.parent.$store;
+    }
+  }
+}
+
+var target = typeof window !== 'undefined'
+  ? window
+  : typeof global !== 'undefined'
+    ? global
+    : {};
+var devtoolHook = target.__VUE_DEVTOOLS_GLOBAL_HOOK__;
+
+function devtoolPlugin (store) {
+  if (!devtoolHook) { return }
+
+  store._devtoolHook = devtoolHook;
+
+  devtoolHook.emit('vuex:init', store);
+
+  devtoolHook.on('vuex:travel-to-state', function (targetState) {
+    store.replaceState(targetState);
+  });
+
+  store.subscribe(function (mutation, state) {
+    devtoolHook.emit('vuex:mutation', mutation, state);
+  }, { prepend: true });
+
+  store.subscribeAction(function (action, state) {
+    devtoolHook.emit('vuex:action', action, state);
+  }, { prepend: true });
+}
+
+/**
+ * Get the first item that pass the test
+ * by second argument function
+ *
+ * @param {Array} list
+ * @param {Function} f
+ * @return {*}
+ */
+
+/**
+ * forEach for object
+ */
+function forEachValue (obj, fn) {
+  Object.keys(obj).forEach(function (key) { return fn(obj[key], key); });
+}
+
+function isObject (obj) {
+  return obj !== null && typeof obj === 'object'
+}
+
+function isPromise (val) {
+  return val && typeof val.then === 'function'
+}
+
+function assert (condition, msg) {
+  if (!condition) { throw new Error(("[vuex] " + msg)) }
+}
+
+function partial (fn, arg) {
+  return function () {
+    return fn(arg)
+  }
+}
+
+// Base data struct for store's module, package with some attribute and method
+var Module = function Module (rawModule, runtime) {
+  this.runtime = runtime;
+  // Store some children item
+  this._children = Object.create(null);
+  // Store the origin module object which passed by programmer
+  this._rawModule = rawModule;
+  var rawState = rawModule.state;
+
+  // Store the origin module's state
+  this.state = (typeof rawState === 'function' ? rawState() : rawState) || {};
+};
+
+var prototypeAccessors = { namespaced: { configurable: true } };
+
+prototypeAccessors.namespaced.get = function () {
+  return !!this._rawModule.namespaced
+};
+
+Module.prototype.addChild = function addChild (key, module) {
+  this._children[key] = module;
+};
+
+Module.prototype.removeChild = function removeChild (key) {
+  delete this._children[key];
+};
+
+Module.prototype.getChild = function getChild (key) {
+  return this._children[key]
+};
+
+Module.prototype.hasChild = function hasChild (key) {
+  return key in this._children
+};
+
+Module.prototype.update = function update (rawModule) {
+  this._rawModule.namespaced = rawModule.namespaced;
+  if (rawModule.actions) {
+    this._rawModule.actions = rawModule.actions;
+  }
+  if (rawModule.mutations) {
+    this._rawModule.mutations = rawModule.mutations;
+  }
+  if (rawModule.getters) {
+    this._rawModule.getters = rawModule.getters;
+  }
+};
+
+Module.prototype.forEachChild = function forEachChild (fn) {
+  forEachValue(this._children, fn);
+};
+
+Module.prototype.forEachGetter = function forEachGetter (fn) {
+  if (this._rawModule.getters) {
+    forEachValue(this._rawModule.getters, fn);
+  }
+};
+
+Module.prototype.forEachAction = function forEachAction (fn) {
+  if (this._rawModule.actions) {
+    forEachValue(this._rawModule.actions, fn);
+  }
+};
+
+Module.prototype.forEachMutation = function forEachMutation (fn) {
+  if (this._rawModule.mutations) {
+    forEachValue(this._rawModule.mutations, fn);
+  }
+};
+
+Object.defineProperties( Module.prototype, prototypeAccessors );
+
+var ModuleCollection = function ModuleCollection (rawRootModule) {
+  // register root module (Vuex.Store options)
+  this.register([], rawRootModule, false);
+};
+
+ModuleCollection.prototype.get = function get (path) {
+  return path.reduce(function (module, key) {
+    return module.getChild(key)
+  }, this.root)
+};
+
+ModuleCollection.prototype.getNamespace = function getNamespace (path) {
+  var module = this.root;
+  return path.reduce(function (namespace, key) {
+    module = module.getChild(key);
+    return namespace + (module.namespaced ? key + '/' : '')
+  }, '')
+};
+
+ModuleCollection.prototype.update = function update$1 (rawRootModule) {
+  update([], this.root, rawRootModule);
+};
+
+ModuleCollection.prototype.register = function register (path, rawModule, runtime) {
+    var this$1 = this;
+    if ( runtime === void 0 ) runtime = true;
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assertRawModule(path, rawModule);
+  }
+
+  var newModule = new Module(rawModule, runtime);
+  if (path.length === 0) {
+    this.root = newModule;
+  } else {
+    var parent = this.get(path.slice(0, -1));
+    parent.addChild(path[path.length - 1], newModule);
+  }
+
+  // register nested modules
+  if (rawModule.modules) {
+    forEachValue(rawModule.modules, function (rawChildModule, key) {
+      this$1.register(path.concat(key), rawChildModule, runtime);
+    });
+  }
+};
+
+ModuleCollection.prototype.unregister = function unregister (path) {
+  var parent = this.get(path.slice(0, -1));
+  var key = path[path.length - 1];
+  if (!parent.getChild(key).runtime) { return }
+
+  parent.removeChild(key);
+};
+
+ModuleCollection.prototype.isRegistered = function isRegistered (path) {
+  var parent = this.get(path.slice(0, -1));
+  var key = path[path.length - 1];
+
+  return parent.hasChild(key)
+};
+
+function update (path, targetModule, newModule) {
+  if ((process.env.NODE_ENV !== 'production')) {
+    assertRawModule(path, newModule);
+  }
+
+  // update target module
+  targetModule.update(newModule);
+
+  // update nested modules
+  if (newModule.modules) {
+    for (var key in newModule.modules) {
+      if (!targetModule.getChild(key)) {
+        if ((process.env.NODE_ENV !== 'production')) {
+          console.warn(
+            "[vuex] trying to add a new module '" + key + "' on hot reloading, " +
+            'manual reload is needed'
+          );
+        }
+        return
+      }
+      update(
+        path.concat(key),
+        targetModule.getChild(key),
+        newModule.modules[key]
+      );
+    }
+  }
+}
+
+var functionAssert = {
+  assert: function (value) { return typeof value === 'function'; },
+  expected: 'function'
+};
+
+var objectAssert = {
+  assert: function (value) { return typeof value === 'function' ||
+    (typeof value === 'object' && typeof value.handler === 'function'); },
+  expected: 'function or object with "handler" function'
+};
+
+var assertTypes = {
+  getters: functionAssert,
+  mutations: functionAssert,
+  actions: objectAssert
+};
+
+function assertRawModule (path, rawModule) {
+  Object.keys(assertTypes).forEach(function (key) {
+    if (!rawModule[key]) { return }
+
+    var assertOptions = assertTypes[key];
+
+    forEachValue(rawModule[key], function (value, type) {
+      assert(
+        assertOptions.assert(value),
+        makeAssertionMessage(path, key, type, value, assertOptions.expected)
+      );
+    });
+  });
+}
+
+function makeAssertionMessage (path, key, type, value, expected) {
+  var buf = key + " should be " + expected + " but \"" + key + "." + type + "\"";
+  if (path.length > 0) {
+    buf += " in module \"" + (path.join('.')) + "\"";
+  }
+  buf += " is " + (JSON.stringify(value)) + ".";
+  return buf
+}
+
+var Vue; // bind on install
+
+var Store = function Store (options) {
+  var this$1 = this;
+  if ( options === void 0 ) options = {};
+
+  // Auto install if it is not done yet and `window` has `Vue`.
+  // To allow users to avoid auto-installation in some cases,
+  // this code should be placed here. See #731
+  if (!Vue && typeof window !== 'undefined' && window.Vue) {
+    install(window.Vue);
+  }
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(Vue, "must call Vue.use(Vuex) before creating a store instance.");
+    assert(typeof Promise !== 'undefined', "vuex requires a Promise polyfill in this browser.");
+    assert(this instanceof Store, "store must be called with the new operator.");
+  }
+
+  var plugins = options.plugins; if ( plugins === void 0 ) plugins = [];
+  var strict = options.strict; if ( strict === void 0 ) strict = false;
+
+  // store internal state
+  this._committing = false;
+  this._actions = Object.create(null);
+  this._actionSubscribers = [];
+  this._mutations = Object.create(null);
+  this._wrappedGetters = Object.create(null);
+  this._modules = new ModuleCollection(options);
+  this._modulesNamespaceMap = Object.create(null);
+  this._subscribers = [];
+  this._watcherVM = new Vue();
+  this._makeLocalGettersCache = Object.create(null);
+
+  // bind commit and dispatch to self
+  var store = this;
+  var ref = this;
+  var dispatch = ref.dispatch;
+  var commit = ref.commit;
+  this.dispatch = function boundDispatch (type, payload) {
+    return dispatch.call(store, type, payload)
+  };
+  this.commit = function boundCommit (type, payload, options) {
+    return commit.call(store, type, payload, options)
+  };
+
+  // strict mode
+  this.strict = strict;
+
+  var state = this._modules.root.state;
+
+  // init root module.
+  // this also recursively registers all sub-modules
+  // and collects all module getters inside this._wrappedGetters
+  installModule(this, state, [], this._modules.root);
+
+  // initialize the store vm, which is responsible for the reactivity
+  // (also registers _wrappedGetters as computed properties)
+  resetStoreVM(this, state);
+
+  // apply plugins
+  plugins.forEach(function (plugin) { return plugin(this$1); });
+
+  var useDevtools = options.devtools !== undefined ? options.devtools : Vue.config.devtools;
+  if (useDevtools) {
+    devtoolPlugin(this);
+  }
+};
+
+var prototypeAccessors$1 = { state: { configurable: true } };
+
+prototypeAccessors$1.state.get = function () {
+  return this._vm._data.$$state
+};
+
+prototypeAccessors$1.state.set = function (v) {
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(false, "use store.replaceState() to explicit replace store state.");
+  }
+};
+
+Store.prototype.commit = function commit (_type, _payload, _options) {
+    var this$1 = this;
+
+  // check object-style commit
+  var ref = unifyObjectStyle(_type, _payload, _options);
+    var type = ref.type;
+    var payload = ref.payload;
+    var options = ref.options;
+
+  var mutation = { type: type, payload: payload };
+  var entry = this._mutations[type];
+  if (!entry) {
+    if ((process.env.NODE_ENV !== 'production')) {
+      console.error(("[vuex] unknown mutation type: " + type));
+    }
+    return
+  }
+  this._withCommit(function () {
+    entry.forEach(function commitIterator (handler) {
+      handler(payload);
+    });
+  });
+
+  this._subscribers
+    .slice() // shallow copy to prevent iterator invalidation if subscriber synchronously calls unsubscribe
+    .forEach(function (sub) { return sub(mutation, this$1.state); });
+
+  if (
+    (process.env.NODE_ENV !== 'production') &&
+    options && options.silent
+  ) {
+    console.warn(
+      "[vuex] mutation type: " + type + ". Silent option has been removed. " +
+      'Use the filter functionality in the vue-devtools'
+    );
+  }
+};
+
+Store.prototype.dispatch = function dispatch (_type, _payload) {
+    var this$1 = this;
+
+  // check object-style dispatch
+  var ref = unifyObjectStyle(_type, _payload);
+    var type = ref.type;
+    var payload = ref.payload;
+
+  var action = { type: type, payload: payload };
+  var entry = this._actions[type];
+  if (!entry) {
+    if ((process.env.NODE_ENV !== 'production')) {
+      console.error(("[vuex] unknown action type: " + type));
+    }
+    return
+  }
+
+  try {
+    this._actionSubscribers
+      .slice() // shallow copy to prevent iterator invalidation if subscriber synchronously calls unsubscribe
+      .filter(function (sub) { return sub.before; })
+      .forEach(function (sub) { return sub.before(action, this$1.state); });
+  } catch (e) {
+    if ((process.env.NODE_ENV !== 'production')) {
+      console.warn("[vuex] error in before action subscribers: ");
+      console.error(e);
+    }
+  }
+
+  var result = entry.length > 1
+    ? Promise.all(entry.map(function (handler) { return handler(payload); }))
+    : entry[0](payload);
+
+  return new Promise(function (resolve, reject) {
+    result.then(function (res) {
+      try {
+        this$1._actionSubscribers
+          .filter(function (sub) { return sub.after; })
+          .forEach(function (sub) { return sub.after(action, this$1.state); });
+      } catch (e) {
+        if ((process.env.NODE_ENV !== 'production')) {
+          console.warn("[vuex] error in after action subscribers: ");
+          console.error(e);
+        }
+      }
+      resolve(res);
+    }, function (error) {
+      try {
+        this$1._actionSubscribers
+          .filter(function (sub) { return sub.error; })
+          .forEach(function (sub) { return sub.error(action, this$1.state, error); });
+      } catch (e) {
+        if ((process.env.NODE_ENV !== 'production')) {
+          console.warn("[vuex] error in error action subscribers: ");
+          console.error(e);
+        }
+      }
+      reject(error);
+    });
+  })
+};
+
+Store.prototype.subscribe = function subscribe (fn, options) {
+  return genericSubscribe(fn, this._subscribers, options)
+};
+
+Store.prototype.subscribeAction = function subscribeAction (fn, options) {
+  var subs = typeof fn === 'function' ? { before: fn } : fn;
+  return genericSubscribe(subs, this._actionSubscribers, options)
+};
+
+Store.prototype.watch = function watch (getter, cb, options) {
+    var this$1 = this;
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(typeof getter === 'function', "store.watch only accepts a function.");
+  }
+  return this._watcherVM.$watch(function () { return getter(this$1.state, this$1.getters); }, cb, options)
+};
+
+Store.prototype.replaceState = function replaceState (state) {
+    var this$1 = this;
+
+  this._withCommit(function () {
+    this$1._vm._data.$$state = state;
+  });
+};
+
+Store.prototype.registerModule = function registerModule (path, rawModule, options) {
+    if ( options === void 0 ) options = {};
+
+  if (typeof path === 'string') { path = [path]; }
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(Array.isArray(path), "module path must be a string or an Array.");
+    assert(path.length > 0, 'cannot register the root module by using registerModule.');
+  }
+
+  this._modules.register(path, rawModule);
+  installModule(this, this.state, path, this._modules.get(path), options.preserveState);
+  // reset store to update getters...
+  resetStoreVM(this, this.state);
+};
+
+Store.prototype.unregisterModule = function unregisterModule (path) {
+    var this$1 = this;
+
+  if (typeof path === 'string') { path = [path]; }
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(Array.isArray(path), "module path must be a string or an Array.");
+  }
+
+  this._modules.unregister(path);
+  this._withCommit(function () {
+    var parentState = getNestedState(this$1.state, path.slice(0, -1));
+    Vue.delete(parentState, path[path.length - 1]);
+  });
+  resetStore(this);
+};
+
+Store.prototype.hasModule = function hasModule (path) {
+  if (typeof path === 'string') { path = [path]; }
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(Array.isArray(path), "module path must be a string or an Array.");
+  }
+
+  return this._modules.isRegistered(path)
+};
+
+Store.prototype.hotUpdate = function hotUpdate (newOptions) {
+  this._modules.update(newOptions);
+  resetStore(this, true);
+};
+
+Store.prototype._withCommit = function _withCommit (fn) {
+  var committing = this._committing;
+  this._committing = true;
+  fn();
+  this._committing = committing;
+};
+
+Object.defineProperties( Store.prototype, prototypeAccessors$1 );
+
+function genericSubscribe (fn, subs, options) {
+  if (subs.indexOf(fn) < 0) {
+    options && options.prepend
+      ? subs.unshift(fn)
+      : subs.push(fn);
+  }
+  return function () {
+    var i = subs.indexOf(fn);
+    if (i > -1) {
+      subs.splice(i, 1);
+    }
+  }
+}
+
+function resetStore (store, hot) {
+  store._actions = Object.create(null);
+  store._mutations = Object.create(null);
+  store._wrappedGetters = Object.create(null);
+  store._modulesNamespaceMap = Object.create(null);
+  var state = store.state;
+  // init all modules
+  installModule(store, state, [], store._modules.root, true);
+  // reset vm
+  resetStoreVM(store, state, hot);
+}
+
+function resetStoreVM (store, state, hot) {
+  var oldVm = store._vm;
+
+  // bind store public getters
+  store.getters = {};
+  // reset local getters cache
+  store._makeLocalGettersCache = Object.create(null);
+  var wrappedGetters = store._wrappedGetters;
+  var computed = {};
+  forEachValue(wrappedGetters, function (fn, key) {
+    // use computed to leverage its lazy-caching mechanism
+    // direct inline function use will lead to closure preserving oldVm.
+    // using partial to return function with only arguments preserved in closure environment.
+    computed[key] = partial(fn, store);
+    Object.defineProperty(store.getters, key, {
+      get: function () { return store._vm[key]; },
+      enumerable: true // for local getters
+    });
+  });
+
+  // use a Vue instance to store the state tree
+  // suppress warnings just in case the user has added
+  // some funky global mixins
+  var silent = Vue.config.silent;
+  Vue.config.silent = true;
+  store._vm = new Vue({
+    data: {
+      $$state: state
+    },
+    computed: computed
+  });
+  Vue.config.silent = silent;
+
+  // enable strict mode for new vm
+  if (store.strict) {
+    enableStrictMode(store);
+  }
+
+  if (oldVm) {
+    if (hot) {
+      // dispatch changes in all subscribed watchers
+      // to force getter re-evaluation for hot reloading.
+      store._withCommit(function () {
+        oldVm._data.$$state = null;
+      });
+    }
+    Vue.nextTick(function () { return oldVm.$destroy(); });
+  }
+}
+
+function installModule (store, rootState, path, module, hot) {
+  var isRoot = !path.length;
+  var namespace = store._modules.getNamespace(path);
+
+  // register in namespace map
+  if (module.namespaced) {
+    if (store._modulesNamespaceMap[namespace] && (process.env.NODE_ENV !== 'production')) {
+      console.error(("[vuex] duplicate namespace " + namespace + " for the namespaced module " + (path.join('/'))));
+    }
+    store._modulesNamespaceMap[namespace] = module;
+  }
+
+  // set state
+  if (!isRoot && !hot) {
+    var parentState = getNestedState(rootState, path.slice(0, -1));
+    var moduleName = path[path.length - 1];
+    store._withCommit(function () {
+      if ((process.env.NODE_ENV !== 'production')) {
+        if (moduleName in parentState) {
+          console.warn(
+            ("[vuex] state field \"" + moduleName + "\" was overridden by a module with the same name at \"" + (path.join('.')) + "\"")
+          );
+        }
+      }
+      Vue.set(parentState, moduleName, module.state);
+    });
+  }
+
+  var local = module.context = makeLocalContext(store, namespace, path);
+
+  module.forEachMutation(function (mutation, key) {
+    var namespacedType = namespace + key;
+    registerMutation(store, namespacedType, mutation, local);
+  });
+
+  module.forEachAction(function (action, key) {
+    var type = action.root ? key : namespace + key;
+    var handler = action.handler || action;
+    registerAction(store, type, handler, local);
+  });
+
+  module.forEachGetter(function (getter, key) {
+    var namespacedType = namespace + key;
+    registerGetter(store, namespacedType, getter, local);
+  });
+
+  module.forEachChild(function (child, key) {
+    installModule(store, rootState, path.concat(key), child, hot);
+  });
+}
+
+/**
+ * make localized dispatch, commit, getters and state
+ * if there is no namespace, just use root ones
+ */
+function makeLocalContext (store, namespace, path) {
+  var noNamespace = namespace === '';
+
+  var local = {
+    dispatch: noNamespace ? store.dispatch : function (_type, _payload, _options) {
+      var args = unifyObjectStyle(_type, _payload, _options);
+      var payload = args.payload;
+      var options = args.options;
+      var type = args.type;
+
+      if (!options || !options.root) {
+        type = namespace + type;
+        if ((process.env.NODE_ENV !== 'production') && !store._actions[type]) {
+          console.error(("[vuex] unknown local action type: " + (args.type) + ", global type: " + type));
+          return
+        }
+      }
+
+      return store.dispatch(type, payload)
+    },
+
+    commit: noNamespace ? store.commit : function (_type, _payload, _options) {
+      var args = unifyObjectStyle(_type, _payload, _options);
+      var payload = args.payload;
+      var options = args.options;
+      var type = args.type;
+
+      if (!options || !options.root) {
+        type = namespace + type;
+        if ((process.env.NODE_ENV !== 'production') && !store._mutations[type]) {
+          console.error(("[vuex] unknown local mutation type: " + (args.type) + ", global type: " + type));
+          return
+        }
+      }
+
+      store.commit(type, payload, options);
+    }
+  };
+
+  // getters and state object must be gotten lazily
+  // because they will be changed by vm update
+  Object.defineProperties(local, {
+    getters: {
+      get: noNamespace
+        ? function () { return store.getters; }
+        : function () { return makeLocalGetters(store, namespace); }
+    },
+    state: {
+      get: function () { return getNestedState(store.state, path); }
+    }
+  });
+
+  return local
+}
+
+function makeLocalGetters (store, namespace) {
+  if (!store._makeLocalGettersCache[namespace]) {
+    var gettersProxy = {};
+    var splitPos = namespace.length;
+    Object.keys(store.getters).forEach(function (type) {
+      // skip if the target getter is not match this namespace
+      if (type.slice(0, splitPos) !== namespace) { return }
+
+      // extract local getter type
+      var localType = type.slice(splitPos);
+
+      // Add a port to the getters proxy.
+      // Define as getter property because
+      // we do not want to evaluate the getters in this time.
+      Object.defineProperty(gettersProxy, localType, {
+        get: function () { return store.getters[type]; },
+        enumerable: true
+      });
+    });
+    store._makeLocalGettersCache[namespace] = gettersProxy;
+  }
+
+  return store._makeLocalGettersCache[namespace]
+}
+
+function registerMutation (store, type, handler, local) {
+  var entry = store._mutations[type] || (store._mutations[type] = []);
+  entry.push(function wrappedMutationHandler (payload) {
+    handler.call(store, local.state, payload);
+  });
+}
+
+function registerAction (store, type, handler, local) {
+  var entry = store._actions[type] || (store._actions[type] = []);
+  entry.push(function wrappedActionHandler (payload) {
+    var res = handler.call(store, {
+      dispatch: local.dispatch,
+      commit: local.commit,
+      getters: local.getters,
+      state: local.state,
+      rootGetters: store.getters,
+      rootState: store.state
+    }, payload);
+    if (!isPromise(res)) {
+      res = Promise.resolve(res);
+    }
+    if (store._devtoolHook) {
+      return res.catch(function (err) {
+        store._devtoolHook.emit('vuex:error', err);
+        throw err
+      })
+    } else {
+      return res
+    }
+  });
+}
+
+function registerGetter (store, type, rawGetter, local) {
+  if (store._wrappedGetters[type]) {
+    if ((process.env.NODE_ENV !== 'production')) {
+      console.error(("[vuex] duplicate getter key: " + type));
+    }
+    return
+  }
+  store._wrappedGetters[type] = function wrappedGetter (store) {
+    return rawGetter(
+      local.state, // local state
+      local.getters, // local getters
+      store.state, // root state
+      store.getters // root getters
+    )
+  };
+}
+
+function enableStrictMode (store) {
+  store._vm.$watch(function () { return this._data.$$state }, function () {
+    if ((process.env.NODE_ENV !== 'production')) {
+      assert(store._committing, "do not mutate vuex store state outside mutation handlers.");
+    }
+  }, { deep: true, sync: true });
+}
+
+function getNestedState (state, path) {
+  return path.reduce(function (state, key) { return state[key]; }, state)
+}
+
+function unifyObjectStyle (type, payload, options) {
+  if (isObject(type) && type.type) {
+    options = payload;
+    payload = type;
+    type = type.type;
+  }
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(typeof type === 'string', ("expects string as the type, but found " + (typeof type) + "."));
+  }
+
+  return { type: type, payload: payload, options: options }
+}
+
+function install (_Vue) {
+  if (Vue && _Vue === Vue) {
+    if ((process.env.NODE_ENV !== 'production')) {
+      console.error(
+        '[vuex] already installed. Vue.use(Vuex) should be called only once.'
+      );
+    }
+    return
+  }
+  Vue = _Vue;
+  applyMixin(Vue);
+}
+
+/**
+ * Reduce the code which written in Vue.js for getting the state.
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} states # Object's item can be a function which accept state and getters for param, you can do something for state and getters in it.
+ * @param {Object}
+ */
+var mapState = normalizeNamespace(function (namespace, states) {
+  var res = {};
+  if ((process.env.NODE_ENV !== 'production') && !isValidMap(states)) {
+    console.error('[vuex] mapState: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(states).forEach(function (ref) {
+    var key = ref.key;
+    var val = ref.val;
+
+    res[key] = function mappedState () {
+      var state = this.$store.state;
+      var getters = this.$store.getters;
+      if (namespace) {
+        var module = getModuleByNamespace(this.$store, 'mapState', namespace);
+        if (!module) {
+          return
+        }
+        state = module.context.state;
+        getters = module.context.getters;
+      }
+      return typeof val === 'function'
+        ? val.call(this, state, getters)
+        : state[val]
+    };
+    // mark vuex getter for devtools
+    res[key].vuex = true;
+  });
+  return res
+});
+
+/**
+ * Reduce the code which written in Vue.js for committing the mutation
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} mutations # Object's item can be a function which accept `commit` function as the first param, it can accept anthor params. You can commit mutation and do any other things in this function. specially, You need to pass anthor params from the mapped function.
+ * @return {Object}
+ */
+var mapMutations = normalizeNamespace(function (namespace, mutations) {
+  var res = {};
+  if ((process.env.NODE_ENV !== 'production') && !isValidMap(mutations)) {
+    console.error('[vuex] mapMutations: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(mutations).forEach(function (ref) {
+    var key = ref.key;
+    var val = ref.val;
+
+    res[key] = function mappedMutation () {
+      var args = [], len = arguments.length;
+      while ( len-- ) args[ len ] = arguments[ len ];
+
+      // Get the commit method from store
+      var commit = this.$store.commit;
+      if (namespace) {
+        var module = getModuleByNamespace(this.$store, 'mapMutations', namespace);
+        if (!module) {
+          return
+        }
+        commit = module.context.commit;
+      }
+      return typeof val === 'function'
+        ? val.apply(this, [commit].concat(args))
+        : commit.apply(this.$store, [val].concat(args))
+    };
+  });
+  return res
+});
+
+/**
+ * Reduce the code which written in Vue.js for getting the getters
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} getters
+ * @return {Object}
+ */
+var mapGetters = normalizeNamespace(function (namespace, getters) {
+  var res = {};
+  if ((process.env.NODE_ENV !== 'production') && !isValidMap(getters)) {
+    console.error('[vuex] mapGetters: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(getters).forEach(function (ref) {
+    var key = ref.key;
+    var val = ref.val;
+
+    // The namespace has been mutated by normalizeNamespace
+    val = namespace + val;
+    res[key] = function mappedGetter () {
+      if (namespace && !getModuleByNamespace(this.$store, 'mapGetters', namespace)) {
+        return
+      }
+      if ((process.env.NODE_ENV !== 'production') && !(val in this.$store.getters)) {
+        console.error(("[vuex] unknown getter: " + val));
+        return
+      }
+      return this.$store.getters[val]
+    };
+    // mark vuex getter for devtools
+    res[key].vuex = true;
+  });
+  return res
+});
+
+/**
+ * Reduce the code which written in Vue.js for dispatch the action
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} actions # Object's item can be a function which accept `dispatch` function as the first param, it can accept anthor params. You can dispatch action and do any other things in this function. specially, You need to pass anthor params from the mapped function.
+ * @return {Object}
+ */
+var mapActions = normalizeNamespace(function (namespace, actions) {
+  var res = {};
+  if ((process.env.NODE_ENV !== 'production') && !isValidMap(actions)) {
+    console.error('[vuex] mapActions: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(actions).forEach(function (ref) {
+    var key = ref.key;
+    var val = ref.val;
+
+    res[key] = function mappedAction () {
+      var args = [], len = arguments.length;
+      while ( len-- ) args[ len ] = arguments[ len ];
+
+      // get dispatch function from store
+      var dispatch = this.$store.dispatch;
+      if (namespace) {
+        var module = getModuleByNamespace(this.$store, 'mapActions', namespace);
+        if (!module) {
+          return
+        }
+        dispatch = module.context.dispatch;
+      }
+      return typeof val === 'function'
+        ? val.apply(this, [dispatch].concat(args))
+        : dispatch.apply(this.$store, [val].concat(args))
+    };
+  });
+  return res
+});
+
+/**
+ * Rebinding namespace param for mapXXX function in special scoped, and return them by simple object
+ * @param {String} namespace
+ * @return {Object}
+ */
+var createNamespacedHelpers = function (namespace) { return ({
+  mapState: mapState.bind(null, namespace),
+  mapGetters: mapGetters.bind(null, namespace),
+  mapMutations: mapMutations.bind(null, namespace),
+  mapActions: mapActions.bind(null, namespace)
+}); };
+
+/**
+ * Normalize the map
+ * normalizeMap([1, 2, 3]) => [ { key: 1, val: 1 }, { key: 2, val: 2 }, { key: 3, val: 3 } ]
+ * normalizeMap({a: 1, b: 2, c: 3}) => [ { key: 'a', val: 1 }, { key: 'b', val: 2 }, { key: 'c', val: 3 } ]
+ * @param {Array|Object} map
+ * @return {Object}
+ */
+function normalizeMap (map) {
+  if (!isValidMap(map)) {
+    return []
+  }
+  return Array.isArray(map)
+    ? map.map(function (key) { return ({ key: key, val: key }); })
+    : Object.keys(map).map(function (key) { return ({ key: key, val: map[key] }); })
+}
+
+/**
+ * Validate whether given map is valid or not
+ * @param {*} map
+ * @return {Boolean}
+ */
+function isValidMap (map) {
+  return Array.isArray(map) || isObject(map)
+}
+
+/**
+ * Return a function expect two param contains namespace and map. it will normalize the namespace and then the param's function will handle the new namespace and the map.
+ * @param {Function} fn
+ * @return {Function}
+ */
+function normalizeNamespace (fn) {
+  return function (namespace, map) {
+    if (typeof namespace !== 'string') {
+      map = namespace;
+      namespace = '';
+    } else if (namespace.charAt(namespace.length - 1) !== '/') {
+      namespace += '/';
+    }
+    return fn(namespace, map)
+  }
+}
+
+/**
+ * Search a special module from store by namespace. if module not exist, print error message.
+ * @param {Object} store
+ * @param {String} helper
+ * @param {String} namespace
+ * @return {Object}
+ */
+function getModuleByNamespace (store, helper, namespace) {
+  var module = store._modulesNamespaceMap[namespace];
+  if ((process.env.NODE_ENV !== 'production') && !module) {
+    console.error(("[vuex] module namespace not found in " + helper + "(): " + namespace));
+  }
+  return module
+}
+
+var index_cjs = {
+  Store: Store,
+  install: install,
+  version: '3.4.0',
+  mapState: mapState,
+  mapMutations: mapMutations,
+  mapGetters: mapGetters,
+  mapActions: mapActions,
+  createNamespacedHelpers: createNamespacedHelpers
+};
+
+module.exports = index_cjs;

dist/vuex.esm.browser.js

@@ -0,0 +1,1052 @@
+/*!
+ * vuex v3.4.0
+ * (c) 2020 Evan You
+ * @license MIT
+ */
+function applyMixin (Vue) {
+  const version = Number(Vue.version.split('.')[0]);
+
+  if (version >= 2) {
+    Vue.mixin({ beforeCreate: vuexInit });
+  } else {
+    // override init and inject vuex init procedure
+    // for 1.x backwards compatibility.
+    const _init = Vue.prototype._init;
+    Vue.prototype._init = function (options = {}) {
+      options.init = options.init
+        ? [vuexInit].concat(options.init)
+        : vuexInit;
+      _init.call(this, options);
+    };
+  }
+
+  /**
+   * Vuex init hook, injected into each instances init hooks list.
+   */
+
+  function vuexInit () {
+    const options = this.$options;
+    // store injection
+    if (options.store) {
+      this.$store = typeof options.store === 'function'
+        ? options.store()
+        : options.store;
+    } else if (options.parent && options.parent.$store) {
+      this.$store = options.parent.$store;
+    }
+  }
+}
+
+const target = typeof window !== 'undefined'
+  ? window
+  : typeof global !== 'undefined'
+    ? global
+    : {};
+const devtoolHook = target.__VUE_DEVTOOLS_GLOBAL_HOOK__;
+
+function devtoolPlugin (store) {
+  if (!devtoolHook) return
+
+  store._devtoolHook = devtoolHook;
+
+  devtoolHook.emit('vuex:init', store);
+
+  devtoolHook.on('vuex:travel-to-state', targetState => {
+    store.replaceState(targetState);
+  });
+
+  store.subscribe((mutation, state) => {
+    devtoolHook.emit('vuex:mutation', mutation, state);
+  }, { prepend: true });
+
+  store.subscribeAction((action, state) => {
+    devtoolHook.emit('vuex:action', action, state);
+  }, { prepend: true });
+}
+
+/**
+ * Get the first item that pass the test
+ * by second argument function
+ *
+ * @param {Array} list
+ * @param {Function} f
+ * @return {*}
+ */
+
+/**
+ * forEach for object
+ */
+function forEachValue (obj, fn) {
+  Object.keys(obj).forEach(key => fn(obj[key], key));
+}
+
+function isObject (obj) {
+  return obj !== null && typeof obj === 'object'
+}
+
+function isPromise (val) {
+  return val && typeof val.then === 'function'
+}
+
+function assert (condition, msg) {
+  if (!condition) throw new Error(`[vuex] ${msg}`)
+}
+
+function partial (fn, arg) {
+  return function () {
+    return fn(arg)
+  }
+}
+
+// Base data struct for store's module, package with some attribute and method
+class Module {
+  constructor (rawModule, runtime) {
+    this.runtime = runtime;
+    // Store some children item
+    this._children = Object.create(null);
+    // Store the origin module object which passed by programmer
+    this._rawModule = rawModule;
+    const rawState = rawModule.state;
+
+    // Store the origin module's state
+    this.state = (typeof rawState === 'function' ? rawState() : rawState) || {};
+  }
+
+  get namespaced () {
+    return !!this._rawModule.namespaced
+  }
+
+  addChild (key, module) {
+    this._children[key] = module;
+  }
+
+  removeChild (key) {
+    delete this._children[key];
+  }
+
+  getChild (key) {
+    return this._children[key]
+  }
+
+  hasChild (key) {
+    return key in this._children
+  }
+
+  update (rawModule) {
+    this._rawModule.namespaced = rawModule.namespaced;
+    if (rawModule.actions) {
+      this._rawModule.actions = rawModule.actions;
+    }
+    if (rawModule.mutations) {
+      this._rawModule.mutations = rawModule.mutations;
+    }
+    if (rawModule.getters) {
+      this._rawModule.getters = rawModule.getters;
+    }
+  }
+
+  forEachChild (fn) {
+    forEachValue(this._children, fn);
+  }
+
+  forEachGetter (fn) {
+    if (this._rawModule.getters) {
+      forEachValue(this._rawModule.getters, fn);
+    }
+  }
+
+  forEachAction (fn) {
+    if (this._rawModule.actions) {
+      forEachValue(this._rawModule.actions, fn);
+    }
+  }
+
+  forEachMutation (fn) {
+    if (this._rawModule.mutations) {
+      forEachValue(this._rawModule.mutations, fn);
+    }
+  }
+}
+
+class ModuleCollection {
+  constructor (rawRootModule) {
+    // register root module (Vuex.Store options)
+    this.register([], rawRootModule, false);
+  }
+
+  get (path) {
+    return path.reduce((module, key) => {
+      return module.getChild(key)
+    }, this.root)
+  }
+
+  getNamespace (path) {
+    let module = this.root;
+    return path.reduce((namespace, key) => {
+      module = module.getChild(key);
+      return namespace + (module.namespaced ? key + '/' : '')
+    }, '')
+  }
+
+  update (rawRootModule) {
+    update([], this.root, rawRootModule);
+  }
+
+  register (path, rawModule, runtime = true) {
+    {
+      assertRawModule(path, rawModule);
+    }
+
+    const newModule = new Module(rawModule, runtime);
+    if (path.length === 0) {
+      this.root = newModule;
+    } else {
+      const parent = this.get(path.slice(0, -1));
+      parent.addChild(path[path.length - 1], newModule);
+    }
+
+    // register nested modules
+    if (rawModule.modules) {
+      forEachValue(rawModule.modules, (rawChildModule, key) => {
+        this.register(path.concat(key), rawChildModule, runtime);
+      });
+    }
+  }
+
+  unregister (path) {
+    const parent = this.get(path.slice(0, -1));
+    const key = path[path.length - 1];
+    if (!parent.getChild(key).runtime) return
+
+    parent.removeChild(key);
+  }
+
+  isRegistered (path) {
+    const parent = this.get(path.slice(0, -1));
+    const key = path[path.length - 1];
+
+    return parent.hasChild(key)
+  }
+}
+
+function update (path, targetModule, newModule) {
+  {
+    assertRawModule(path, newModule);
+  }
+
+  // update target module
+  targetModule.update(newModule);
+
+  // update nested modules
+  if (newModule.modules) {
+    for (const key in newModule.modules) {
+      if (!targetModule.getChild(key)) {
+        {
+          console.warn(
+            `[vuex] trying to add a new module '${key}' on hot reloading, ` +
+            'manual reload is needed'
+          );
+        }
+        return
+      }
+      update(
+        path.concat(key),
+        targetModule.getChild(key),
+        newModule.modules[key]
+      );
+    }
+  }
+}
+
+const functionAssert = {
+  assert: value => typeof value === 'function',
+  expected: 'function'
+};
+
+const objectAssert = {
+  assert: value => typeof value === 'function' ||
+    (typeof value === 'object' && typeof value.handler === 'function'),
+  expected: 'function or object with "handler" function'
+};
+
+const assertTypes = {
+  getters: functionAssert,
+  mutations: functionAssert,
+  actions: objectAssert
+};
+
+function assertRawModule (path, rawModule) {
+  Object.keys(assertTypes).forEach(key => {
+    if (!rawModule[key]) return
+
+    const assertOptions = assertTypes[key];
+
+    forEachValue(rawModule[key], (value, type) => {
+      assert(
+        assertOptions.assert(value),
+        makeAssertionMessage(path, key, type, value, assertOptions.expected)
+      );
+    });
+  });
+}
+
+function makeAssertionMessage (path, key, type, value, expected) {
+  let buf = `${key} should be ${expected} but "${key}.${type}"`;
+  if (path.length > 0) {
+    buf += ` in module "${path.join('.')}"`;
+  }
+  buf += ` is ${JSON.stringify(value)}.`;
+  return buf
+}
+
+let Vue; // bind on install
+
+class Store {
+  constructor (options = {}) {
+    // Auto install if it is not done yet and `window` has `Vue`.
+    // To allow users to avoid auto-installation in some cases,
+    // this code should be placed here. See #731
+    if (!Vue && typeof window !== 'undefined' && window.Vue) {
+      install(window.Vue);
+    }
+
+    {
+      assert(Vue, `must call Vue.use(Vuex) before creating a store instance.`);
+      assert(typeof Promise !== 'undefined', `vuex requires a Promise polyfill in this browser.`);
+      assert(this instanceof Store, `store must be called with the new operator.`);
+    }
+
+    const {
+      plugins = [],
+      strict = false
+    } = options;
+
+    // store internal state
+    this._committing = false;
+    this._actions = Object.create(null);
+    this._actionSubscribers = [];
+    this._mutations = Object.create(null);
+    this._wrappedGetters = Object.create(null);
+    this._modules = new ModuleCollection(options);
+    this._modulesNamespaceMap = Object.create(null);
+    this._subscribers = [];
+    this._watcherVM = new Vue();
+    this._makeLocalGettersCache = Object.create(null);
+
+    // bind commit and dispatch to self
+    const store = this;
+    const { dispatch, commit } = this;
+    this.dispatch = function boundDispatch (type, payload) {
+      return dispatch.call(store, type, payload)
+    };
+    this.commit = function boundCommit (type, payload, options) {
+      return commit.call(store, type, payload, options)
+    };
+
+    // strict mode
+    this.strict = strict;
+
+    const state = this._modules.root.state;
+
+    // init root module.
+    // this also recursively registers all sub-modules
+    // and collects all module getters inside this._wrappedGetters
+    installModule(this, state, [], this._modules.root);
+
+    // initialize the store vm, which is responsible for the reactivity
+    // (also registers _wrappedGetters as computed properties)
+    resetStoreVM(this, state);
+
+    // apply plugins
+    plugins.forEach(plugin => plugin(this));
+
+    const useDevtools = options.devtools !== undefined ? options.devtools : Vue.config.devtools;
+    if (useDevtools) {
+      devtoolPlugin(this);
+    }
+  }
+
+  get state () {
+    return this._vm._data.$$state
+  }
+
+  set state (v) {
+    {
+      assert(false, `use store.replaceState() to explicit replace store state.`);
+    }
+  }
+
+  commit (_type, _payload, _options) {
+    // check object-style commit
+    const {
+      type,
+      payload,
+      options
+    } = unifyObjectStyle(_type, _payload, _options);
+
+    const mutation = { type, payload };
+    const entry = this._mutations[type];
+    if (!entry) {
+      {
+        console.error(`[vuex] unknown mutation type: ${type}`);
+      }
+      return
+    }
+    this._withCommit(() => {
+      entry.forEach(function commitIterator (handler) {
+        handler(payload);
+      });
+    });
+
+    this._subscribers
+      .slice() // shallow copy to prevent iterator invalidation if subscriber synchronously calls unsubscribe
+      .forEach(sub => sub(mutation, this.state));
+
+    if (
+      
+      options && options.silent
+    ) {
+      console.warn(
+        `[vuex] mutation type: ${type}. Silent option has been removed. ` +
+        'Use the filter functionality in the vue-devtools'
+      );
+    }
+  }
+
+  dispatch (_type, _payload) {
+    // check object-style dispatch
+    const {
+      type,
+      payload
+    } = unifyObjectStyle(_type, _payload);
+
+    const action = { type, payload };
+    const entry = this._actions[type];
+    if (!entry) {
+      {
+        console.error(`[vuex] unknown action type: ${type}`);
+      }
+      return
+    }
+
+    try {
+      this._actionSubscribers
+        .slice() // shallow copy to prevent iterator invalidation if subscriber synchronously calls unsubscribe
+        .filter(sub => sub.before)
+        .forEach(sub => sub.before(action, this.state));
+    } catch (e) {
+      {
+        console.warn(`[vuex] error in before action subscribers: `);
+        console.error(e);
+      }
+    }
+
+    const result = entry.length > 1
+      ? Promise.all(entry.map(handler => handler(payload)))
+      : entry[0](payload);
+
+    return new Promise((resolve, reject) => {
+      result.then(res => {
+        try {
+          this._actionSubscribers
+            .filter(sub => sub.after)
+            .forEach(sub => sub.after(action, this.state));
+        } catch (e) {
+          {
+            console.warn(`[vuex] error in after action subscribers: `);
+            console.error(e);
+          }
+        }
+        resolve(res);
+      }, error => {
+        try {
+          this._actionSubscribers
+            .filter(sub => sub.error)
+            .forEach(sub => sub.error(action, this.state, error));
+        } catch (e) {
+          {
+            console.warn(`[vuex] error in error action subscribers: `);
+            console.error(e);
+          }
+        }
+        reject(error);
+      });
+    })
+  }
+
+  subscribe (fn, options) {
+    return genericSubscribe(fn, this._subscribers, options)
+  }
+
+  subscribeAction (fn, options) {
+    const subs = typeof fn === 'function' ? { before: fn } : fn;
+    return genericSubscribe(subs, this._actionSubscribers, options)
+  }
+
+  watch (getter, cb, options) {
+    {
+      assert(typeof getter === 'function', `store.watch only accepts a function.`);
+    }
+    return this._watcherVM.$watch(() => getter(this.state, this.getters), cb, options)
+  }
+
+  replaceState (state) {
+    this._withCommit(() => {
+      this._vm._data.$$state = state;
+    });
+  }
+
+  registerModule (path, rawModule, options = {}) {
+    if (typeof path === 'string') path = [path];
+
+    {
+      assert(Array.isArray(path), `module path must be a string or an Array.`);
+      assert(path.length > 0, 'cannot register the root module by using registerModule.');
+    }
+
+    this._modules.register(path, rawModule);
+    installModule(this, this.state, path, this._modules.get(path), options.preserveState);
+    // reset store to update getters...
+    resetStoreVM(this, this.state);
+  }
+
+  unregisterModule (path) {
+    if (typeof path === 'string') path = [path];
+
+    {
+      assert(Array.isArray(path), `module path must be a string or an Array.`);
+    }
+
+    this._modules.unregister(path);
+    this._withCommit(() => {
+      const parentState = getNestedState(this.state, path.slice(0, -1));
+      Vue.delete(parentState, path[path.length - 1]);
+    });
+    resetStore(this);
+  }
+
+  hasModule (path) {
+    if (typeof path === 'string') path = [path];
+
+    {
+      assert(Array.isArray(path), `module path must be a string or an Array.`);
+    }
+
+    return this._modules.isRegistered(path)
+  }
+
+  hotUpdate (newOptions) {
+    this._modules.update(newOptions);
+    resetStore(this, true);
+  }
+
+  _withCommit (fn) {
+    const committing = this._committing;
+    this._committing = true;
+    fn();
+    this._committing = committing;
+  }
+}
+
+function genericSubscribe (fn, subs, options) {
+  if (subs.indexOf(fn) < 0) {
+    options && options.prepend
+      ? subs.unshift(fn)
+      : subs.push(fn);
+  }
+  return () => {
+    const i = subs.indexOf(fn);
+    if (i > -1) {
+      subs.splice(i, 1);
+    }
+  }
+}
+
+function resetStore (store, hot) {
+  store._actions = Object.create(null);
+  store._mutations = Object.create(null);
+  store._wrappedGetters = Object.create(null);
+  store._modulesNamespaceMap = Object.create(null);
+  const state = store.state;
+  // init all modules
+  installModule(store, state, [], store._modules.root, true);
+  // reset vm
+  resetStoreVM(store, state, hot);
+}
+
+function resetStoreVM (store, state, hot) {
+  const oldVm = store._vm;
+
+  // bind store public getters
+  store.getters = {};
+  // reset local getters cache
+  store._makeLocalGettersCache = Object.create(null);
+  const wrappedGetters = store._wrappedGetters;
+  const computed = {};
+  forEachValue(wrappedGetters, (fn, key) => {
+    // use computed to leverage its lazy-caching mechanism
+    // direct inline function use will lead to closure preserving oldVm.
+    // using partial to return function with only arguments preserved in closure environment.
+    computed[key] = partial(fn, store);
+    Object.defineProperty(store.getters, key, {
+      get: () => store._vm[key],
+      enumerable: true // for local getters
+    });
+  });
+
+  // use a Vue instance to store the state tree
+  // suppress warnings just in case the user has added
+  // some funky global mixins
+  const silent = Vue.config.silent;
+  Vue.config.silent = true;
+  store._vm = new Vue({
+    data: {
+      $$state: state
+    },
+    computed
+  });
+  Vue.config.silent = silent;
+
+  // enable strict mode for new vm
+  if (store.strict) {
+    enableStrictMode(store);
+  }
+
+  if (oldVm) {
+    if (hot) {
+      // dispatch changes in all subscribed watchers
+      // to force getter re-evaluation for hot reloading.
+      store._withCommit(() => {
+        oldVm._data.$$state = null;
+      });
+    }
+    Vue.nextTick(() => oldVm.$destroy());
+  }
+}
+
+function installModule (store, rootState, path, module, hot) {
+  const isRoot = !path.length;
+  const namespace = store._modules.getNamespace(path);
+
+  // register in namespace map
+  if (module.namespaced) {
+    if (store._modulesNamespaceMap[namespace] && true) {
+      console.error(`[vuex] duplicate namespace ${namespace} for the namespaced module ${path.join('/')}`);
+    }
+    store._modulesNamespaceMap[namespace] = module;
+  }
+
+  // set state
+  if (!isRoot && !hot) {
+    const parentState = getNestedState(rootState, path.slice(0, -1));
+    const moduleName = path[path.length - 1];
+    store._withCommit(() => {
+      {
+        if (moduleName in parentState) {
+          console.warn(
+            `[vuex] state field "${moduleName}" was overridden by a module with the same name at "${path.join('.')}"`
+          );
+        }
+      }
+      Vue.set(parentState, moduleName, module.state);
+    });
+  }
+
+  const local = module.context = makeLocalContext(store, namespace, path);
+
+  module.forEachMutation((mutation, key) => {
+    const namespacedType = namespace + key;
+    registerMutation(store, namespacedType, mutation, local);
+  });
+
+  module.forEachAction((action, key) => {
+    const type = action.root ? key : namespace + key;
+    const handler = action.handler || action;
+    registerAction(store, type, handler, local);
+  });
+
+  module.forEachGetter((getter, key) => {
+    const namespacedType = namespace + key;
+    registerGetter(store, namespacedType, getter, local);
+  });
+
+  module.forEachChild((child, key) => {
+    installModule(store, rootState, path.concat(key), child, hot);
+  });
+}
+
+/**
+ * make localized dispatch, commit, getters and state
+ * if there is no namespace, just use root ones
+ */
+function makeLocalContext (store, namespace, path) {
+  const noNamespace = namespace === '';
+
+  const local = {
+    dispatch: noNamespace ? store.dispatch : (_type, _payload, _options) => {
+      const args = unifyObjectStyle(_type, _payload, _options);
+      const { payload, options } = args;
+      let { type } = args;
+
+      if (!options || !options.root) {
+        type = namespace + type;
+        if ( !store._actions[type]) {
+          console.error(`[vuex] unknown local action type: ${args.type}, global type: ${type}`);
+          return
+        }
+      }
+
+      return store.dispatch(type, payload)
+    },
+
+    commit: noNamespace ? store.commit : (_type, _payload, _options) => {
+      const args = unifyObjectStyle(_type, _payload, _options);
+      const { payload, options } = args;
+      let { type } = args;
+
+      if (!options || !options.root) {
+        type = namespace + type;
+        if ( !store._mutations[type]) {
+          console.error(`[vuex] unknown local mutation type: ${args.type}, global type: ${type}`);
+          return
+        }
+      }
+
+      store.commit(type, payload, options);
+    }
+  };
+
+  // getters and state object must be gotten lazily
+  // because they will be changed by vm update
+  Object.defineProperties(local, {
+    getters: {
+      get: noNamespace
+        ? () => store.getters
+        : () => makeLocalGetters(store, namespace)
+    },
+    state: {
+      get: () => getNestedState(store.state, path)
+    }
+  });
+
+  return local
+}
+
+function makeLocalGetters (store, namespace) {
+  if (!store._makeLocalGettersCache[namespace]) {
+    const gettersProxy = {};
+    const splitPos = namespace.length;
+    Object.keys(store.getters).forEach(type => {
+      // skip if the target getter is not match this namespace
+      if (type.slice(0, splitPos) !== namespace) return
+
+      // extract local getter type
+      const localType = type.slice(splitPos);
+
+      // Add a port to the getters proxy.
+      // Define as getter property because
+      // we do not want to evaluate the getters in this time.
+      Object.defineProperty(gettersProxy, localType, {
+        get: () => store.getters[type],
+        enumerable: true
+      });
+    });
+    store._makeLocalGettersCache[namespace] = gettersProxy;
+  }
+
+  return store._makeLocalGettersCache[namespace]
+}
+
+function registerMutation (store, type, handler, local) {
+  const entry = store._mutations[type] || (store._mutations[type] = []);
+  entry.push(function wrappedMutationHandler (payload) {
+    handler.call(store, local.state, payload);
+  });
+}
+
+function registerAction (store, type, handler, local) {
+  const entry = store._actions[type] || (store._actions[type] = []);
+  entry.push(function wrappedActionHandler (payload) {
+    let res = handler.call(store, {
+      dispatch: local.dispatch,
+      commit: local.commit,
+      getters: local.getters,
+      state: local.state,
+      rootGetters: store.getters,
+      rootState: store.state
+    }, payload);
+    if (!isPromise(res)) {
+      res = Promise.resolve(res);
+    }
+    if (store._devtoolHook) {
+      return res.catch(err => {
+        store._devtoolHook.emit('vuex:error', err);
+        throw err
+      })
+    } else {
+      return res
+    }
+  });
+}
+
+function registerGetter (store, type, rawGetter, local) {
+  if (store._wrappedGetters[type]) {
+    {
+      console.error(`[vuex] duplicate getter key: ${type}`);
+    }
+    return
+  }
+  store._wrappedGetters[type] = function wrappedGetter (store) {
+    return rawGetter(
+      local.state, // local state
+      local.getters, // local getters
+      store.state, // root state
+      store.getters // root getters
+    )
+  };
+}
+
+function enableStrictMode (store) {
+  store._vm.$watch(function () { return this._data.$$state }, () => {
+    {
+      assert(store._committing, `do not mutate vuex store state outside mutation handlers.`);
+    }
+  }, { deep: true, sync: true });
+}
+
+function getNestedState (state, path) {
+  return path.reduce((state, key) => state[key], state)
+}
+
+function unifyObjectStyle (type, payload, options) {
+  if (isObject(type) && type.type) {
+    options = payload;
+    payload = type;
+    type = type.type;
+  }
+
+  {
+    assert(typeof type === 'string', `expects string as the type, but found ${typeof type}.`);
+  }
+
+  return { type, payload, options }
+}
+
+function install (_Vue) {
+  if (Vue && _Vue === Vue) {
+    {
+      console.error(
+        '[vuex] already installed. Vue.use(Vuex) should be called only once.'
+      );
+    }
+    return
+  }
+  Vue = _Vue;
+  applyMixin(Vue);
+}
+
+/**
+ * Reduce the code which written in Vue.js for getting the state.
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} states # Object's item can be a function which accept state and getters for param, you can do something for state and getters in it.
+ * @param {Object}
+ */
+const mapState = normalizeNamespace((namespace, states) => {
+  const res = {};
+  if ( !isValidMap(states)) {
+    console.error('[vuex] mapState: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(states).forEach(({ key, val }) => {
+    res[key] = function mappedState () {
+      let state = this.$store.state;
+      let getters = this.$store.getters;
+      if (namespace) {
+        const module = getModuleByNamespace(this.$store, 'mapState', namespace);
+        if (!module) {
+          return
+        }
+        state = module.context.state;
+        getters = module.context.getters;
+      }
+      return typeof val === 'function'
+        ? val.call(this, state, getters)
+        : state[val]
+    };
+    // mark vuex getter for devtools
+    res[key].vuex = true;
+  });
+  return res
+});
+
+/**
+ * Reduce the code which written in Vue.js for committing the mutation
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} mutations # Object's item can be a function which accept `commit` function as the first param, it can accept anthor params. You can commit mutation and do any other things in this function. specially, You need to pass anthor params from the mapped function.
+ * @return {Object}
+ */
+const mapMutations = normalizeNamespace((namespace, mutations) => {
+  const res = {};
+  if ( !isValidMap(mutations)) {
+    console.error('[vuex] mapMutations: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(mutations).forEach(({ key, val }) => {
+    res[key] = function mappedMutation (...args) {
+      // Get the commit method from store
+      let commit = this.$store.commit;
+      if (namespace) {
+        const module = getModuleByNamespace(this.$store, 'mapMutations', namespace);
+        if (!module) {
+          return
+        }
+        commit = module.context.commit;
+      }
+      return typeof val === 'function'
+        ? val.apply(this, [commit].concat(args))
+        : commit.apply(this.$store, [val].concat(args))
+    };
+  });
+  return res
+});
+
+/**
+ * Reduce the code which written in Vue.js for getting the getters
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} getters
+ * @return {Object}
+ */
+const mapGetters = normalizeNamespace((namespace, getters) => {
+  const res = {};
+  if ( !isValidMap(getters)) {
+    console.error('[vuex] mapGetters: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(getters).forEach(({ key, val }) => {
+    // The namespace has been mutated by normalizeNamespace
+    val = namespace + val;
+    res[key] = function mappedGetter () {
+      if (namespace && !getModuleByNamespace(this.$store, 'mapGetters', namespace)) {
+        return
+      }
+      if ( !(val in this.$store.getters)) {
+        console.error(`[vuex] unknown getter: ${val}`);
+        return
+      }
+      return this.$store.getters[val]
+    };
+    // mark vuex getter for devtools
+    res[key].vuex = true;
+  });
+  return res
+});
+
+/**
+ * Reduce the code which written in Vue.js for dispatch the action
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} actions # Object's item can be a function which accept `dispatch` function as the first param, it can accept anthor params. You can dispatch action and do any other things in this function. specially, You need to pass anthor params from the mapped function.
+ * @return {Object}
+ */
+const mapActions = normalizeNamespace((namespace, actions) => {
+  const res = {};
+  if ( !isValidMap(actions)) {
+    console.error('[vuex] mapActions: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(actions).forEach(({ key, val }) => {
+    res[key] = function mappedAction (...args) {
+      // get dispatch function from store
+      let dispatch = this.$store.dispatch;
+      if (namespace) {
+        const module = getModuleByNamespace(this.$store, 'mapActions', namespace);
+        if (!module) {
+          return
+        }
+        dispatch = module.context.dispatch;
+      }
+      return typeof val === 'function'
+        ? val.apply(this, [dispatch].concat(args))
+        : dispatch.apply(this.$store, [val].concat(args))
+    };
+  });
+  return res
+});
+
+/**
+ * Rebinding namespace param for mapXXX function in special scoped, and return them by simple object
+ * @param {String} namespace
+ * @return {Object}
+ */
+const createNamespacedHelpers = (namespace) => ({
+  mapState: mapState.bind(null, namespace),
+  mapGetters: mapGetters.bind(null, namespace),
+  mapMutations: mapMutations.bind(null, namespace),
+  mapActions: mapActions.bind(null, namespace)
+});
+
+/**
+ * Normalize the map
+ * normalizeMap([1, 2, 3]) => [ { key: 1, val: 1 }, { key: 2, val: 2 }, { key: 3, val: 3 } ]
+ * normalizeMap({a: 1, b: 2, c: 3}) => [ { key: 'a', val: 1 }, { key: 'b', val: 2 }, { key: 'c', val: 3 } ]
+ * @param {Array|Object} map
+ * @return {Object}
+ */
+function normalizeMap (map) {
+  if (!isValidMap(map)) {
+    return []
+  }
+  return Array.isArray(map)
+    ? map.map(key => ({ key, val: key }))
+    : Object.keys(map).map(key => ({ key, val: map[key] }))
+}
+
+/**
+ * Validate whether given map is valid or not
+ * @param {*} map
+ * @return {Boolean}
+ */
+function isValidMap (map) {
+  return Array.isArray(map) || isObject(map)
+}
+
+/**
+ * Return a function expect two param contains namespace and map. it will normalize the namespace and then the param's function will handle the new namespace and the map.
+ * @param {Function} fn
+ * @return {Function}
+ */
+function normalizeNamespace (fn) {
+  return (namespace, map) => {
+    if (typeof namespace !== 'string') {
+      map = namespace;
+      namespace = '';
+    } else if (namespace.charAt(namespace.length - 1) !== '/') {
+      namespace += '/';
+    }
+    return fn(namespace, map)
+  }
+}
+
+/**
+ * Search a special module from store by namespace. if module not exist, print error message.
+ * @param {Object} store
+ * @param {String} helper
+ * @param {String} namespace
+ * @return {Object}
+ */
+function getModuleByNamespace (store, helper, namespace) {
+  const module = store._modulesNamespaceMap[namespace];
+  if ( !module) {
+    console.error(`[vuex] module namespace not found in ${helper}(): ${namespace}`);
+  }
+  return module
+}
+
+var index = {
+  Store,
+  install,
+  version: '3.4.0',
+  mapState,
+  mapMutations,
+  mapGetters,
+  mapActions,
+  createNamespacedHelpers
+};
+
+export default index;
+export { Store, createNamespacedHelpers, install, mapActions, mapGetters, mapMutations, mapState };

dist/vuex.esm.js

@@ -0,0 +1,1092 @@
+/*!
+ * vuex v3.4.0
+ * (c) 2020 Evan You
+ * @license MIT
+ */
+function applyMixin (Vue) {
+  var version = Number(Vue.version.split('.')[0]);
+
+  if (version >= 2) {
+    Vue.mixin({ beforeCreate: vuexInit });
+  } else {
+    // override init and inject vuex init procedure
+    // for 1.x backwards compatibility.
+    var _init = Vue.prototype._init;
+    Vue.prototype._init = function (options) {
+      if ( options === void 0 ) options = {};
+
+      options.init = options.init
+        ? [vuexInit].concat(options.init)
+        : vuexInit;
+      _init.call(this, options);
+    };
+  }
+
+  /**
+   * Vuex init hook, injected into each instances init hooks list.
+   */
+
+  function vuexInit () {
+    var options = this.$options;
+    // store injection
+    if (options.store) {
+      this.$store = typeof options.store === 'function'
+        ? options.store()
+        : options.store;
+    } else if (options.parent && options.parent.$store) {
+      this.$store = options.parent.$store;
+    }
+  }
+}
+
+var target = typeof window !== 'undefined'
+  ? window
+  : typeof global !== 'undefined'
+    ? global
+    : {};
+var devtoolHook = target.__VUE_DEVTOOLS_GLOBAL_HOOK__;
+
+function devtoolPlugin (store) {
+  if (!devtoolHook) { return }
+
+  store._devtoolHook = devtoolHook;
+
+  devtoolHook.emit('vuex:init', store);
+
+  devtoolHook.on('vuex:travel-to-state', function (targetState) {
+    store.replaceState(targetState);
+  });
+
+  store.subscribe(function (mutation, state) {
+    devtoolHook.emit('vuex:mutation', mutation, state);
+  }, { prepend: true });
+
+  store.subscribeAction(function (action, state) {
+    devtoolHook.emit('vuex:action', action, state);
+  }, { prepend: true });
+}
+
+/**
+ * Get the first item that pass the test
+ * by second argument function
+ *
+ * @param {Array} list
+ * @param {Function} f
+ * @return {*}
+ */
+
+/**
+ * forEach for object
+ */
+function forEachValue (obj, fn) {
+  Object.keys(obj).forEach(function (key) { return fn(obj[key], key); });
+}
+
+function isObject (obj) {
+  return obj !== null && typeof obj === 'object'
+}
+
+function isPromise (val) {
+  return val && typeof val.then === 'function'
+}
+
+function assert (condition, msg) {
+  if (!condition) { throw new Error(("[vuex] " + msg)) }
+}
+
+function partial (fn, arg) {
+  return function () {
+    return fn(arg)
+  }
+}
+
+// Base data struct for store's module, package with some attribute and method
+var Module = function Module (rawModule, runtime) {
+  this.runtime = runtime;
+  // Store some children item
+  this._children = Object.create(null);
+  // Store the origin module object which passed by programmer
+  this._rawModule = rawModule;
+  var rawState = rawModule.state;
+
+  // Store the origin module's state
+  this.state = (typeof rawState === 'function' ? rawState() : rawState) || {};
+};
+
+var prototypeAccessors = { namespaced: { configurable: true } };
+
+prototypeAccessors.namespaced.get = function () {
+  return !!this._rawModule.namespaced
+};
+
+Module.prototype.addChild = function addChild (key, module) {
+  this._children[key] = module;
+};
+
+Module.prototype.removeChild = function removeChild (key) {
+  delete this._children[key];
+};
+
+Module.prototype.getChild = function getChild (key) {
+  return this._children[key]
+};
+
+Module.prototype.hasChild = function hasChild (key) {
+  return key in this._children
+};
+
+Module.prototype.update = function update (rawModule) {
+  this._rawModule.namespaced = rawModule.namespaced;
+  if (rawModule.actions) {
+    this._rawModule.actions = rawModule.actions;
+  }
+  if (rawModule.mutations) {
+    this._rawModule.mutations = rawModule.mutations;
+  }
+  if (rawModule.getters) {
+    this._rawModule.getters = rawModule.getters;
+  }
+};
+
+Module.prototype.forEachChild = function forEachChild (fn) {
+  forEachValue(this._children, fn);
+};
+
+Module.prototype.forEachGetter = function forEachGetter (fn) {
+  if (this._rawModule.getters) {
+    forEachValue(this._rawModule.getters, fn);
+  }
+};
+
+Module.prototype.forEachAction = function forEachAction (fn) {
+  if (this._rawModule.actions) {
+    forEachValue(this._rawModule.actions, fn);
+  }
+};
+
+Module.prototype.forEachMutation = function forEachMutation (fn) {
+  if (this._rawModule.mutations) {
+    forEachValue(this._rawModule.mutations, fn);
+  }
+};
+
+Object.defineProperties( Module.prototype, prototypeAccessors );
+
+var ModuleCollection = function ModuleCollection (rawRootModule) {
+  // register root module (Vuex.Store options)
+  this.register([], rawRootModule, false);
+};
+
+ModuleCollection.prototype.get = function get (path) {
+  return path.reduce(function (module, key) {
+    return module.getChild(key)
+  }, this.root)
+};
+
+ModuleCollection.prototype.getNamespace = function getNamespace (path) {
+  var module = this.root;
+  return path.reduce(function (namespace, key) {
+    module = module.getChild(key);
+    return namespace + (module.namespaced ? key + '/' : '')
+  }, '')
+};
+
+ModuleCollection.prototype.update = function update$1 (rawRootModule) {
+  update([], this.root, rawRootModule);
+};
+
+ModuleCollection.prototype.register = function register (path, rawModule, runtime) {
+    var this$1 = this;
+    if ( runtime === void 0 ) runtime = true;
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assertRawModule(path, rawModule);
+  }
+
+  var newModule = new Module(rawModule, runtime);
+  if (path.length === 0) {
+    this.root = newModule;
+  } else {
+    var parent = this.get(path.slice(0, -1));
+    parent.addChild(path[path.length - 1], newModule);
+  }
+
+  // register nested modules
+  if (rawModule.modules) {
+    forEachValue(rawModule.modules, function (rawChildModule, key) {
+      this$1.register(path.concat(key), rawChildModule, runtime);
+    });
+  }
+};
+
+ModuleCollection.prototype.unregister = function unregister (path) {
+  var parent = this.get(path.slice(0, -1));
+  var key = path[path.length - 1];
+  if (!parent.getChild(key).runtime) { return }
+
+  parent.removeChild(key);
+};
+
+ModuleCollection.prototype.isRegistered = function isRegistered (path) {
+  var parent = this.get(path.slice(0, -1));
+  var key = path[path.length - 1];
+
+  return parent.hasChild(key)
+};
+
+function update (path, targetModule, newModule) {
+  if ((process.env.NODE_ENV !== 'production')) {
+    assertRawModule(path, newModule);
+  }
+
+  // update target module
+  targetModule.update(newModule);
+
+  // update nested modules
+  if (newModule.modules) {
+    for (var key in newModule.modules) {
+      if (!targetModule.getChild(key)) {
+        if ((process.env.NODE_ENV !== 'production')) {
+          console.warn(
+            "[vuex] trying to add a new module '" + key + "' on hot reloading, " +
+            'manual reload is needed'
+          );
+        }
+        return
+      }
+      update(
+        path.concat(key),
+        targetModule.getChild(key),
+        newModule.modules[key]
+      );
+    }
+  }
+}
+
+var functionAssert = {
+  assert: function (value) { return typeof value === 'function'; },
+  expected: 'function'
+};
+
+var objectAssert = {
+  assert: function (value) { return typeof value === 'function' ||
+    (typeof value === 'object' && typeof value.handler === 'function'); },
+  expected: 'function or object with "handler" function'
+};
+
+var assertTypes = {
+  getters: functionAssert,
+  mutations: functionAssert,
+  actions: objectAssert
+};
+
+function assertRawModule (path, rawModule) {
+  Object.keys(assertTypes).forEach(function (key) {
+    if (!rawModule[key]) { return }
+
+    var assertOptions = assertTypes[key];
+
+    forEachValue(rawModule[key], function (value, type) {
+      assert(
+        assertOptions.assert(value),
+        makeAssertionMessage(path, key, type, value, assertOptions.expected)
+      );
+    });
+  });
+}
+
+function makeAssertionMessage (path, key, type, value, expected) {
+  var buf = key + " should be " + expected + " but \"" + key + "." + type + "\"";
+  if (path.length > 0) {
+    buf += " in module \"" + (path.join('.')) + "\"";
+  }
+  buf += " is " + (JSON.stringify(value)) + ".";
+  return buf
+}
+
+var Vue; // bind on install
+
+var Store = function Store (options) {
+  var this$1 = this;
+  if ( options === void 0 ) options = {};
+
+  // Auto install if it is not done yet and `window` has `Vue`.
+  // To allow users to avoid auto-installation in some cases,
+  // this code should be placed here. See #731
+  if (!Vue && typeof window !== 'undefined' && window.Vue) {
+    install(window.Vue);
+  }
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(Vue, "must call Vue.use(Vuex) before creating a store instance.");
+    assert(typeof Promise !== 'undefined', "vuex requires a Promise polyfill in this browser.");
+    assert(this instanceof Store, "store must be called with the new operator.");
+  }
+
+  var plugins = options.plugins; if ( plugins === void 0 ) plugins = [];
+  var strict = options.strict; if ( strict === void 0 ) strict = false;
+
+  // store internal state
+  this._committing = false;
+  this._actions = Object.create(null);
+  this._actionSubscribers = [];
+  this._mutations = Object.create(null);
+  this._wrappedGetters = Object.create(null);
+  this._modules = new ModuleCollection(options);
+  this._modulesNamespaceMap = Object.create(null);
+  this._subscribers = [];
+  this._watcherVM = new Vue();
+  this._makeLocalGettersCache = Object.create(null);
+
+  // bind commit and dispatch to self
+  var store = this;
+  var ref = this;
+  var dispatch = ref.dispatch;
+  var commit = ref.commit;
+  this.dispatch = function boundDispatch (type, payload) {
+    return dispatch.call(store, type, payload)
+  };
+  this.commit = function boundCommit (type, payload, options) {
+    return commit.call(store, type, payload, options)
+  };
+
+  // strict mode
+  this.strict = strict;
+
+  var state = this._modules.root.state;
+
+  // init root module.
+  // this also recursively registers all sub-modules
+  // and collects all module getters inside this._wrappedGetters
+  installModule(this, state, [], this._modules.root);
+
+  // initialize the store vm, which is responsible for the reactivity
+  // (also registers _wrappedGetters as computed properties)
+  resetStoreVM(this, state);
+
+  // apply plugins
+  plugins.forEach(function (plugin) { return plugin(this$1); });
+
+  var useDevtools = options.devtools !== undefined ? options.devtools : Vue.config.devtools;
+  if (useDevtools) {
+    devtoolPlugin(this);
+  }
+};
+
+var prototypeAccessors$1 = { state: { configurable: true } };
+
+prototypeAccessors$1.state.get = function () {
+  return this._vm._data.$$state
+};
+
+prototypeAccessors$1.state.set = function (v) {
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(false, "use store.replaceState() to explicit replace store state.");
+  }
+};
+
+Store.prototype.commit = function commit (_type, _payload, _options) {
+    var this$1 = this;
+
+  // check object-style commit
+  var ref = unifyObjectStyle(_type, _payload, _options);
+    var type = ref.type;
+    var payload = ref.payload;
+    var options = ref.options;
+
+  var mutation = { type: type, payload: payload };
+  var entry = this._mutations[type];
+  if (!entry) {
+    if ((process.env.NODE_ENV !== 'production')) {
+      console.error(("[vuex] unknown mutation type: " + type));
+    }
+    return
+  }
+  this._withCommit(function () {
+    entry.forEach(function commitIterator (handler) {
+      handler(payload);
+    });
+  });
+
+  this._subscribers
+    .slice() // shallow copy to prevent iterator invalidation if subscriber synchronously calls unsubscribe
+    .forEach(function (sub) { return sub(mutation, this$1.state); });
+
+  if (
+    (process.env.NODE_ENV !== 'production') &&
+    options && options.silent
+  ) {
+    console.warn(
+      "[vuex] mutation type: " + type + ". Silent option has been removed. " +
+      'Use the filter functionality in the vue-devtools'
+    );
+  }
+};
+
+Store.prototype.dispatch = function dispatch (_type, _payload) {
+    var this$1 = this;
+
+  // check object-style dispatch
+  var ref = unifyObjectStyle(_type, _payload);
+    var type = ref.type;
+    var payload = ref.payload;
+
+  var action = { type: type, payload: payload };
+  var entry = this._actions[type];
+  if (!entry) {
+    if ((process.env.NODE_ENV !== 'production')) {
+      console.error(("[vuex] unknown action type: " + type));
+    }
+    return
+  }
+
+  try {
+    this._actionSubscribers
+      .slice() // shallow copy to prevent iterator invalidation if subscriber synchronously calls unsubscribe
+      .filter(function (sub) { return sub.before; })
+      .forEach(function (sub) { return sub.before(action, this$1.state); });
+  } catch (e) {
+    if ((process.env.NODE_ENV !== 'production')) {
+      console.warn("[vuex] error in before action subscribers: ");
+      console.error(e);
+    }
+  }
+
+  var result = entry.length > 1
+    ? Promise.all(entry.map(function (handler) { return handler(payload); }))
+    : entry[0](payload);
+
+  return new Promise(function (resolve, reject) {
+    result.then(function (res) {
+      try {
+        this$1._actionSubscribers
+          .filter(function (sub) { return sub.after; })
+          .forEach(function (sub) { return sub.after(action, this$1.state); });
+      } catch (e) {
+        if ((process.env.NODE_ENV !== 'production')) {
+          console.warn("[vuex] error in after action subscribers: ");
+          console.error(e);
+        }
+      }
+      resolve(res);
+    }, function (error) {
+      try {
+        this$1._actionSubscribers
+          .filter(function (sub) { return sub.error; })
+          .forEach(function (sub) { return sub.error(action, this$1.state, error); });
+      } catch (e) {
+        if ((process.env.NODE_ENV !== 'production')) {
+          console.warn("[vuex] error in error action subscribers: ");
+          console.error(e);
+        }
+      }
+      reject(error);
+    });
+  })
+};
+
+Store.prototype.subscribe = function subscribe (fn, options) {
+  return genericSubscribe(fn, this._subscribers, options)
+};
+
+Store.prototype.subscribeAction = function subscribeAction (fn, options) {
+  var subs = typeof fn === 'function' ? { before: fn } : fn;
+  return genericSubscribe(subs, this._actionSubscribers, options)
+};
+
+Store.prototype.watch = function watch (getter, cb, options) {
+    var this$1 = this;
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(typeof getter === 'function', "store.watch only accepts a function.");
+  }
+  return this._watcherVM.$watch(function () { return getter(this$1.state, this$1.getters); }, cb, options)
+};
+
+Store.prototype.replaceState = function replaceState (state) {
+    var this$1 = this;
+
+  this._withCommit(function () {
+    this$1._vm._data.$$state = state;
+  });
+};
+
+Store.prototype.registerModule = function registerModule (path, rawModule, options) {
+    if ( options === void 0 ) options = {};
+
+  if (typeof path === 'string') { path = [path]; }
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(Array.isArray(path), "module path must be a string or an Array.");
+    assert(path.length > 0, 'cannot register the root module by using registerModule.');
+  }
+
+  this._modules.register(path, rawModule);
+  installModule(this, this.state, path, this._modules.get(path), options.preserveState);
+  // reset store to update getters...
+  resetStoreVM(this, this.state);
+};
+
+Store.prototype.unregisterModule = function unregisterModule (path) {
+    var this$1 = this;
+
+  if (typeof path === 'string') { path = [path]; }
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(Array.isArray(path), "module path must be a string or an Array.");
+  }
+
+  this._modules.unregister(path);
+  this._withCommit(function () {
+    var parentState = getNestedState(this$1.state, path.slice(0, -1));
+    Vue.delete(parentState, path[path.length - 1]);
+  });
+  resetStore(this);
+};
+
+Store.prototype.hasModule = function hasModule (path) {
+  if (typeof path === 'string') { path = [path]; }
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(Array.isArray(path), "module path must be a string or an Array.");
+  }
+
+  return this._modules.isRegistered(path)
+};
+
+Store.prototype.hotUpdate = function hotUpdate (newOptions) {
+  this._modules.update(newOptions);
+  resetStore(this, true);
+};
+
+Store.prototype._withCommit = function _withCommit (fn) {
+  var committing = this._committing;
+  this._committing = true;
+  fn();
+  this._committing = committing;
+};
+
+Object.defineProperties( Store.prototype, prototypeAccessors$1 );
+
+function genericSubscribe (fn, subs, options) {
+  if (subs.indexOf(fn) < 0) {
+    options && options.prepend
+      ? subs.unshift(fn)
+      : subs.push(fn);
+  }
+  return function () {
+    var i = subs.indexOf(fn);
+    if (i > -1) {
+      subs.splice(i, 1);
+    }
+  }
+}
+
+function resetStore (store, hot) {
+  store._actions = Object.create(null);
+  store._mutations = Object.create(null);
+  store._wrappedGetters = Object.create(null);
+  store._modulesNamespaceMap = Object.create(null);
+  var state = store.state;
+  // init all modules
+  installModule(store, state, [], store._modules.root, true);
+  // reset vm
+  resetStoreVM(store, state, hot);
+}
+
+function resetStoreVM (store, state, hot) {
+  var oldVm = store._vm;
+
+  // bind store public getters
+  store.getters = {};
+  // reset local getters cache
+  store._makeLocalGettersCache = Object.create(null);
+  var wrappedGetters = store._wrappedGetters;
+  var computed = {};
+  forEachValue(wrappedGetters, function (fn, key) {
+    // use computed to leverage its lazy-caching mechanism
+    // direct inline function use will lead to closure preserving oldVm.
+    // using partial to return function with only arguments preserved in closure environment.
+    computed[key] = partial(fn, store);
+    Object.defineProperty(store.getters, key, {
+      get: function () { return store._vm[key]; },
+      enumerable: true // for local getters
+    });
+  });
+
+  // use a Vue instance to store the state tree
+  // suppress warnings just in case the user has added
+  // some funky global mixins
+  var silent = Vue.config.silent;
+  Vue.config.silent = true;
+  store._vm = new Vue({
+    data: {
+      $$state: state
+    },
+    computed: computed
+  });
+  Vue.config.silent = silent;
+
+  // enable strict mode for new vm
+  if (store.strict) {
+    enableStrictMode(store);
+  }
+
+  if (oldVm) {
+    if (hot) {
+      // dispatch changes in all subscribed watchers
+      // to force getter re-evaluation for hot reloading.
+      store._withCommit(function () {
+        oldVm._data.$$state = null;
+      });
+    }
+    Vue.nextTick(function () { return oldVm.$destroy(); });
+  }
+}
+
+function installModule (store, rootState, path, module, hot) {
+  var isRoot = !path.length;
+  var namespace = store._modules.getNamespace(path);
+
+  // register in namespace map
+  if (module.namespaced) {
+    if (store._modulesNamespaceMap[namespace] && (process.env.NODE_ENV !== 'production')) {
+      console.error(("[vuex] duplicate namespace " + namespace + " for the namespaced module " + (path.join('/'))));
+    }
+    store._modulesNamespaceMap[namespace] = module;
+  }
+
+  // set state
+  if (!isRoot && !hot) {
+    var parentState = getNestedState(rootState, path.slice(0, -1));
+    var moduleName = path[path.length - 1];
+    store._withCommit(function () {
+      if ((process.env.NODE_ENV !== 'production')) {
+        if (moduleName in parentState) {
+          console.warn(
+            ("[vuex] state field \"" + moduleName + "\" was overridden by a module with the same name at \"" + (path.join('.')) + "\"")
+          );
+        }
+      }
+      Vue.set(parentState, moduleName, module.state);
+    });
+  }
+
+  var local = module.context = makeLocalContext(store, namespace, path);
+
+  module.forEachMutation(function (mutation, key) {
+    var namespacedType = namespace + key;
+    registerMutation(store, namespacedType, mutation, local);
+  });
+
+  module.forEachAction(function (action, key) {
+    var type = action.root ? key : namespace + key;
+    var handler = action.handler || action;
+    registerAction(store, type, handler, local);
+  });
+
+  module.forEachGetter(function (getter, key) {
+    var namespacedType = namespace + key;
+    registerGetter(store, namespacedType, getter, local);
+  });
+
+  module.forEachChild(function (child, key) {
+    installModule(store, rootState, path.concat(key), child, hot);
+  });
+}
+
+/**
+ * make localized dispatch, commit, getters and state
+ * if there is no namespace, just use root ones
+ */
+function makeLocalContext (store, namespace, path) {
+  var noNamespace = namespace === '';
+
+  var local = {
+    dispatch: noNamespace ? store.dispatch : function (_type, _payload, _options) {
+      var args = unifyObjectStyle(_type, _payload, _options);
+      var payload = args.payload;
+      var options = args.options;
+      var type = args.type;
+
+      if (!options || !options.root) {
+        type = namespace + type;
+        if ((process.env.NODE_ENV !== 'production') && !store._actions[type]) {
+          console.error(("[vuex] unknown local action type: " + (args.type) + ", global type: " + type));
+          return
+        }
+      }
+
+      return store.dispatch(type, payload)
+    },
+
+    commit: noNamespace ? store.commit : function (_type, _payload, _options) {
+      var args = unifyObjectStyle(_type, _payload, _options);
+      var payload = args.payload;
+      var options = args.options;
+      var type = args.type;
+
+      if (!options || !options.root) {
+        type = namespace + type;
+        if ((process.env.NODE_ENV !== 'production') && !store._mutations[type]) {
+          console.error(("[vuex] unknown local mutation type: " + (args.type) + ", global type: " + type));
+          return
+        }
+      }
+
+      store.commit(type, payload, options);
+    }
+  };
+
+  // getters and state object must be gotten lazily
+  // because they will be changed by vm update
+  Object.defineProperties(local, {
+    getters: {
+      get: noNamespace
+        ? function () { return store.getters; }
+        : function () { return makeLocalGetters(store, namespace); }
+    },
+    state: {
+      get: function () { return getNestedState(store.state, path); }
+    }
+  });
+
+  return local
+}
+
+function makeLocalGetters (store, namespace) {
+  if (!store._makeLocalGettersCache[namespace]) {
+    var gettersProxy = {};
+    var splitPos = namespace.length;
+    Object.keys(store.getters).forEach(function (type) {
+      // skip if the target getter is not match this namespace
+      if (type.slice(0, splitPos) !== namespace) { return }
+
+      // extract local getter type
+      var localType = type.slice(splitPos);
+
+      // Add a port to the getters proxy.
+      // Define as getter property because
+      // we do not want to evaluate the getters in this time.
+      Object.defineProperty(gettersProxy, localType, {
+        get: function () { return store.getters[type]; },
+        enumerable: true
+      });
+    });
+    store._makeLocalGettersCache[namespace] = gettersProxy;
+  }
+
+  return store._makeLocalGettersCache[namespace]
+}
+
+function registerMutation (store, type, handler, local) {
+  var entry = store._mutations[type] || (store._mutations[type] = []);
+  entry.push(function wrappedMutationHandler (payload) {
+    handler.call(store, local.state, payload);
+  });
+}
+
+function registerAction (store, type, handler, local) {
+  var entry = store._actions[type] || (store._actions[type] = []);
+  entry.push(function wrappedActionHandler (payload) {
+    var res = handler.call(store, {
+      dispatch: local.dispatch,
+      commit: local.commit,
+      getters: local.getters,
+      state: local.state,
+      rootGetters: store.getters,
+      rootState: store.state
+    }, payload);
+    if (!isPromise(res)) {
+      res = Promise.resolve(res);
+    }
+    if (store._devtoolHook) {
+      return res.catch(function (err) {
+        store._devtoolHook.emit('vuex:error', err);
+        throw err
+      })
+    } else {
+      return res
+    }
+  });
+}
+
+function registerGetter (store, type, rawGetter, local) {
+  if (store._wrappedGetters[type]) {
+    if ((process.env.NODE_ENV !== 'production')) {
+      console.error(("[vuex] duplicate getter key: " + type));
+    }
+    return
+  }
+  store._wrappedGetters[type] = function wrappedGetter (store) {
+    return rawGetter(
+      local.state, // local state
+      local.getters, // local getters
+      store.state, // root state
+      store.getters // root getters
+    )
+  };
+}
+
+function enableStrictMode (store) {
+  store._vm.$watch(function () { return this._data.$$state }, function () {
+    if ((process.env.NODE_ENV !== 'production')) {
+      assert(store._committing, "do not mutate vuex store state outside mutation handlers.");
+    }
+  }, { deep: true, sync: true });
+}
+
+function getNestedState (state, path) {
+  return path.reduce(function (state, key) { return state[key]; }, state)
+}
+
+function unifyObjectStyle (type, payload, options) {
+  if (isObject(type) && type.type) {
+    options = payload;
+    payload = type;
+    type = type.type;
+  }
+
+  if ((process.env.NODE_ENV !== 'production')) {
+    assert(typeof type === 'string', ("expects string as the type, but found " + (typeof type) + "."));
+  }
+
+  return { type: type, payload: payload, options: options }
+}
+
+function install (_Vue) {
+  if (Vue && _Vue === Vue) {
+    if ((process.env.NODE_ENV !== 'production')) {
+      console.error(
+        '[vuex] already installed. Vue.use(Vuex) should be called only once.'
+      );
+    }
+    return
+  }
+  Vue = _Vue;
+  applyMixin(Vue);
+}
+
+/**
+ * Reduce the code which written in Vue.js for getting the state.
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} states # Object's item can be a function which accept state and getters for param, you can do something for state and getters in it.
+ * @param {Object}
+ */
+var mapState = normalizeNamespace(function (namespace, states) {
+  var res = {};
+  if ((process.env.NODE_ENV !== 'production') && !isValidMap(states)) {
+    console.error('[vuex] mapState: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(states).forEach(function (ref) {
+    var key = ref.key;
+    var val = ref.val;
+
+    res[key] = function mappedState () {
+      var state = this.$store.state;
+      var getters = this.$store.getters;
+      if (namespace) {
+        var module = getModuleByNamespace(this.$store, 'mapState', namespace);
+        if (!module) {
+          return
+        }
+        state = module.context.state;
+        getters = module.context.getters;
+      }
+      return typeof val === 'function'
+        ? val.call(this, state, getters)
+        : state[val]
+    };
+    // mark vuex getter for devtools
+    res[key].vuex = true;
+  });
+  return res
+});
+
+/**
+ * Reduce the code which written in Vue.js for committing the mutation
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} mutations # Object's item can be a function which accept `commit` function as the first param, it can accept anthor params. You can commit mutation and do any other things in this function. specially, You need to pass anthor params from the mapped function.
+ * @return {Object}
+ */
+var mapMutations = normalizeNamespace(function (namespace, mutations) {
+  var res = {};
+  if ((process.env.NODE_ENV !== 'production') && !isValidMap(mutations)) {
+    console.error('[vuex] mapMutations: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(mutations).forEach(function (ref) {
+    var key = ref.key;
+    var val = ref.val;
+
+    res[key] = function mappedMutation () {
+      var args = [], len = arguments.length;
+      while ( len-- ) args[ len ] = arguments[ len ];
+
+      // Get the commit method from store
+      var commit = this.$store.commit;
+      if (namespace) {
+        var module = getModuleByNamespace(this.$store, 'mapMutations', namespace);
+        if (!module) {
+          return
+        }
+        commit = module.context.commit;
+      }
+      return typeof val === 'function'
+        ? val.apply(this, [commit].concat(args))
+        : commit.apply(this.$store, [val].concat(args))
+    };
+  });
+  return res
+});
+
+/**
+ * Reduce the code which written in Vue.js for getting the getters
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} getters
+ * @return {Object}
+ */
+var mapGetters = normalizeNamespace(function (namespace, getters) {
+  var res = {};
+  if ((process.env.NODE_ENV !== 'production') && !isValidMap(getters)) {
+    console.error('[vuex] mapGetters: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(getters).forEach(function (ref) {
+    var key = ref.key;
+    var val = ref.val;
+
+    // The namespace has been mutated by normalizeNamespace
+    val = namespace + val;
+    res[key] = function mappedGetter () {
+      if (namespace && !getModuleByNamespace(this.$store, 'mapGetters', namespace)) {
+        return
+      }
+      if ((process.env.NODE_ENV !== 'production') && !(val in this.$store.getters)) {
+        console.error(("[vuex] unknown getter: " + val));
+        return
+      }
+      return this.$store.getters[val]
+    };
+    // mark vuex getter for devtools
+    res[key].vuex = true;
+  });
+  return res
+});
+
+/**
+ * Reduce the code which written in Vue.js for dispatch the action
+ * @param {String} [namespace] - Module's namespace
+ * @param {Object|Array} actions # Object's item can be a function which accept `dispatch` function as the first param, it can accept anthor params. You can dispatch action and do any other things in this function. specially, You need to pass anthor params from the mapped function.
+ * @return {Object}
+ */
+var mapActions = normalizeNamespace(function (namespace, actions) {
+  var res = {};
+  if ((process.env.NODE_ENV !== 'production') && !isValidMap(actions)) {
+    console.error('[vuex] mapActions: mapper parameter must be either an Array or an Object');
+  }
+  normalizeMap(actions).forEach(function (ref) {
+    var key = ref.key;
+    var val = ref.val;
+
+    res[key] = function mappedAction () {
+      var args = [], len = arguments.length;
+      while ( len-- ) args[ len ] = arguments[ len ];
+
+      // get dispatch function from store
+      var dispatch = this.$store.dispatch;
+      if (namespace) {
+        var module = getModuleByNamespace(this.$store, 'mapActions', namespace);
+        if (!module) {
+          return
+        }
+        dispatch = module.context.dispatch;
+      }
+      return typeof val === 'function'
+        ? val.apply(this, [dispatch].concat(args))
+        : dispatch.apply(this.$store, [val].concat(args))
+    };
+  });
+  return res
+});
+
+/**
+ * Rebinding namespace param for mapXXX function in special scoped, and return them by simple object
+ * @param {String} namespace
+ * @return {Object}
+ */
+var createNamespacedHelpers = function (namespace) { return ({
+  mapState: mapState.bind(null, namespace),
+  mapGetters: mapGetters.bind(null, namespace),
+  mapMutations: mapMutations.bind(null, namespace),
+  mapActions: mapActions.bind(null, namespace)
+}); };
+
+/**
+ * Normalize the map
+ * normalizeMap([1, 2, 3]) => [ { key: 1, val: 1 }, { key: 2, val: 2 }, { key: 3, val: 3 } ]
+ * normalizeMap({a: 1, b: 2, c: 3}) => [ { key: 'a', val: 1 }, { key: 'b', val: 2 }, { key: 'c', val: 3 } ]
+ * @param {Array|Object} map
+ * @return {Object}
+ */
+function normalizeMap (map) {
+  if (!isValidMap(map)) {
+    return []
+  }
+  return Array.isArray(map)
+    ? map.map(function (key) { return ({ key: key, val: key }); })
+    : Object.keys(map).map(function (key) { return ({ key: key, val: map[key] }); })
+}
+
+/**
+ * Validate whether given map is valid or not
+ * @param {*} map
+ * @return {Boolean}
+ */
+function isValidMap (map) {
+  return Array.isArray(map) || isObject(map)
+}
+
+/**
+ * Return a function expect two param contains namespace and map. it will normalize the namespace and then the param's function will handle the new namespace and the map.
+ * @param {Function} fn
+ * @return {Function}
+ */
+function normalizeNamespace (fn) {
+  return function (namespace, map) {
+    if (typeof namespace !== 'string') {
+      map = namespace;
+      namespace = '';
+    } else if (namespace.charAt(namespace.length - 1) !== '/') {
+      namespace += '/';
+    }
+    return fn(namespace, map)
+  }
+}
+
+/**
+ * Search a special module from store by namespace. if module not exist, print error message.
+ * @param {Object} store
+ * @param {String} helper
+ * @param {String} namespace
+ * @return {Object}
+ */
+function getModuleByNamespace (store, helper, namespace) {
+  var module = store._modulesNamespaceMap[namespace];
+  if ((process.env.NODE_ENV !== 'production') && !module) {
+    console.error(("[vuex] module namespace not found in " + helper + "(): " + namespace));
+  }
+  return module
+}
+
+var index = {
+  Store: Store,
+  install: install,
+  version: '3.4.0',
+  mapState: mapState,
+  mapMutations: mapMutations,
+  mapGetters: mapGetters,
+  mapActions: mapActions,
+  createNamespacedHelpers: createNamespacedHelpers
+};
+
+export default index;
+export { Store, createNamespacedHelpers, install, mapActions, mapGetters, mapMutations, mapState };

dist/vuex.js

@@ -0,0 +1,1099 @@
+/*!
+ * vuex v3.4.0
+ * (c) 2020 Evan You
+ * @license MIT
+ */
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global = global || self, global.Vuex = factory());
+}(this, (function () { 'use strict';
+
+  function applyMixin (Vue) {
+    var version = Number(Vue.version.split('.')[0]);
+
+    if (version >= 2) {
+      Vue.mixin({ beforeCreate: vuexInit });
+    } else {
+      // override init and inject vuex init procedure
+      // for 1.x backwards compatibility.
+      var _init = Vue.prototype._init;
+      Vue.prototype._init = function (options) {
+        if ( options === void 0 ) options = {};
+
+        options.init = options.init
+          ? [vuexInit].concat(options.init)
+          : vuexInit;
+        _init.call(this, options);
+      };
+    }
+
+    /**
+     * Vuex init hook, injected into each instances init hooks list.
+     */
+
+    function vuexInit () {
+      var options = this.$options;
+      // store injection
+      if (options.store) {
+        this.$store = typeof options.store === 'function'
+          ? options.store()
+          : options.store;
+      } else if (options.parent && options.parent.$store) {
+        this.$store = options.parent.$store;
+      }
+    }
+  }
+
+  var target = typeof window !== 'undefined'
+    ? window
+    : typeof global !== 'undefined'
+      ? global
+      : {};
+  var devtoolHook = target.__VUE_DEVTOOLS_GLOBAL_HOOK__;
+
+  function devtoolPlugin (store) {
+    if (!devtoolHook) { return }
+
+    store._devtoolHook = devtoolHook;
+
+    devtoolHook.emit('vuex:init', store);
+
+    devtoolHook.on('vuex:travel-to-state', function (targetState) {
+      store.replaceState(targetState);
+    });
+
+    store.subscribe(function (mutation, state) {
+      devtoolHook.emit('vuex:mutation', mutation, state);
+    }, { prepend: true });
+
+    store.subscribeAction(function (action, state) {
+      devtoolHook.emit('vuex:action', action, state);
+    }, { prepend: true });
+  }
+
+  /**
+   * Get the first item that pass the test
+   * by second argument function
+   *
+   * @param {Array} list
+   * @param {Function} f
+   * @return {*}
+   */
+
+  /**
+   * forEach for object
+   */
+  function forEachValue (obj, fn) {
+    Object.keys(obj).forEach(function (key) { return fn(obj[key], key); });
+  }
+
+  function isObject (obj) {
+    return obj !== null && typeof obj === 'object'
+  }
+
+  function isPromise (val) {
+    return val && typeof val.then === 'function'
+  }
+
+  function assert (condition, msg) {
+    if (!condition) { throw new Error(("[vuex] " + msg)) }
+  }
+
+  function partial (fn, arg) {
+    return function () {
+      return fn(arg)
+    }
+  }
+
+  // Base data struct for store's module, package with some attribute and method
+  var Module = function Module (rawModule, runtime) {
+    this.runtime = runtime;
+    // Store some children item
+    this._children = Object.create(null);
+    // Store the origin module object which passed by programmer
+    this._rawModule = rawModule;
+    var rawState = rawModule.state;
+
+    // Store the origin module's state
+    this.state = (typeof rawState === 'function' ? rawState() : rawState) || {};
+  };
+
+  var prototypeAccessors = { namespaced: { configurable: true } };
+
+  prototypeAccessors.namespaced.get = function () {
+    return !!this._rawModule.namespaced
+  };
+
+  Module.prototype.addChild = function addChild (key, module) {
+    this._children[key] = module;
+  };
+
+  Module.prototype.removeChild = function removeChild (key) {
+    delete this._children[key];
+  };
+
+  Module.prototype.getChild = function getChild (key) {
+    return this._children[key]
+  };
+
+  Module.prototype.hasChild = function hasChild (key) {
+    return key in this._children
+  };
+
+  Module.prototype.update = function update (rawModule) {
+    this._rawModule.namespaced = rawModule.namespaced;
+    if (rawModule.actions) {
+      this._rawModule.actions = rawModule.actions;
+    }
+    if (rawModule.mutations) {
+      this._rawModule.mutations = rawModule.mutations;
+    }
+    if (rawModule.getters) {
+      this._rawModule.getters = rawModule.getters;
+    }
+  };
+
+  Module.prototype.forEachChild = function forEachChild (fn) {
+    forEachValue(this._children, fn);
+  };
+
+  Module.prototype.forEachGetter = function forEachGetter (fn) {
+    if (this._rawModule.getters) {
+      forEachValue(this._rawModule.getters, fn);
+    }
+  };
+
+  Module.prototype.forEachAction = function forEachAction (fn) {
+    if (this._rawModule.actions) {
+      forEachValue(this._rawModule.actions, fn);
+    }
+  };
+
+  Module.prototype.forEachMutation = function forEachMutation (fn) {
+    if (this._rawModule.mutations) {
+      forEachValue(this._rawModule.mutations, fn);
+    }
+  };
+
+  Object.defineProperties( Module.prototype, prototypeAccessors );
+
+  var ModuleCollection = function ModuleCollection (rawRootModule) {
+    // register root module (Vuex.Store options)
+    this.register([], rawRootModule, false);
+  };
+
+  ModuleCollection.prototype.get = function get (path) {
+    return path.reduce(function (module, key) {
+      return module.getChild(key)
+    }, this.root)
+  };
+
+  ModuleCollection.prototype.getNamespace = function getNamespace (path) {
+    var module = this.root;
+    return path.reduce(function (namespace, key) {
+      module = module.getChild(key);
+      return namespace + (module.namespaced ? key + '/' : '')
+    }, '')
+  };
+
+  ModuleCollection.prototype.update = function update$1 (rawRootModule) {
+    update([], this.root, rawRootModule);
+  };
+
+  ModuleCollection.prototype.register = function register (path, rawModule, runtime) {
+      var this$1 = this;
+      if ( runtime === void 0 ) runtime = true;
+
+    {
+      assertRawModule(path, rawModule);
+    }
+
+    var newModule = new Module(rawModule, runtime);
+    if (path.length === 0) {
+      this.root = newModule;
+    } else {
+      var parent = this.get(path.slice(0, -1));
+      parent.addChild(path[path.length - 1], newModule);
+    }
+
+    // register nested modules
+    if (rawModule.modules) {
+      forEachValue(rawModule.modules, function (rawChildModule, key) {
+        this$1.register(path.concat(key), rawChildModule, runtime);
+      });
+    }
+  };
+
+  ModuleCollection.prototype.unregister = function unregister (path) {
+    var parent = this.get(path.slice(0, -1));
+    var key = path[path.length - 1];
+    if (!parent.getChild(key).runtime) { return }
+
+    parent.removeChild(key);
+  };
+
+  ModuleCollection.prototype.isRegistered = function isRegistered (path) {
+    var parent = this.get(path.slice(0, -1));
+    var key = path[path.length - 1];
+
+    return parent.hasChild(key)
+  };
+
+  function update (path, targetModule, newModule) {
+    {
+      assertRawModule(path, newModule);
+    }
+
+    // update target module
+    targetModule.update(newModule);
+
+    // update nested modules
+    if (newModule.modules) {
+      for (var key in newModule.modules) {
+        if (!targetModule.getChild(key)) {
+          {
+            console.warn(
+              "[vuex] trying to add a new module '" + key + "' on hot reloading, " +
+              'manual reload is needed'
+            );
+          }
+          return
+        }
+        update(
+          path.concat(key),
+          targetModule.getChild(key),
+          newModule.modules[key]
+        );
+      }
+    }
+  }
+
+  var functionAssert = {
+    assert: function (value) { return typeof value === 'function'; },
+    expected: 'function'
+  };
+
+  var objectAssert = {
+    assert: function (value) { return typeof value === 'function' ||
+      (typeof value === 'object' && typeof value.handler === 'function'); },
+    expected: 'function or object with "handler" function'
+  };
+
+  var assertTypes = {
+    getters: functionAssert,
+    mutations: functionAssert,
+    actions: objectAssert
+  };
+
+  function assertRawModule (path, rawModule) {
+    Object.keys(assertTypes).forEach(function (key) {
+      if (!rawModule[key]) { return }
+
+      var assertOptions = assertTypes[key];
+
+      forEachValue(rawModule[key], function (value, type) {
+        assert(
+          assertOptions.assert(value),
+          makeAssertionMessage(path, key, type, value, assertOptions.expected)
+        );
+      });
+    });
+  }
+
+  function makeAssertionMessage (path, key, type, value, expected) {
+    var buf = key + " should be " + expected + " but \"" + key + "." + type + "\"";
+    if (path.length > 0) {
+      buf += " in module \"" + (path.join('.')) + "\"";
+    }
+    buf += " is " + (JSON.stringify(value)) + ".";
+    return buf
+  }
+
+  var Vue; // bind on install
+
+  var Store = function Store (options) {
+    var this$1 = this;
+    if ( options === void 0 ) options = {};
+
+    // Auto install if it is not done yet and `window` has `Vue`.
+    // To allow users to avoid auto-installation in some cases,
+    // this code should be placed here. See #731
+    if (!Vue && typeof window !== 'undefined' && window.Vue) {
+      install(window.Vue);
+    }
+
+    {
+      assert(Vue, "must call Vue.use(Vuex) before creating a store instance.");
+      assert(typeof Promise !== 'undefined', "vuex requires a Promise polyfill in this browser.");
+      assert(this instanceof Store, "store must be called with the new operator.");
+    }
+
+    var plugins = options.plugins; if ( plugins === void 0 ) plugins = [];
+    var strict = options.strict; if ( strict === void 0 ) strict = false;
+
+    // store internal state
+    this._committing = false;
+    this._actions = Object.create(null);
+    this._actionSubscribers = [];
+    this._mutations = Object.create(null);
+    this._wrappedGetters = Object.create(null);
+    this._modules = new ModuleCollection(options);
+    this._modulesNamespaceMap = Object.create(null);
+    this._subscribers = [];
+    this._watcherVM = new Vue();
+    this._makeLocalGettersCache = Object.create(null);
+
+    // bind commit and dispatch to self
+    var store = this;
+    var ref = this;
+    var dispatch = ref.dispatch;
+    var commit = ref.commit;
+    this.dispatch = function boundDispatch (type, payload) {
+      return dispatch.call(store, type, payload)
+    };
+    this.commit = function boundCommit (type, payload, options) {
+      return commit.call(store, type, payload, options)
+    };
+
+    // strict mode
+    this.strict = strict;
+
+    var state = this._modules.root.state;
+
+    // init root module.
+    // this also recursively registers all sub-modules
+    // and collects all module getters inside this._wrappedGetters
+    installModule(this, state, [], this._modules.root);
+
+    // initialize the store vm, which is responsible for the reactivity
+    // (also registers _wrappedGetters as computed properties)
+    resetStoreVM(this, state);
+
+    // apply plugins
+    plugins.forEach(function (plugin) { return plugin(this$1); });
+
+    var useDevtools = options.devtools !== undefined ? options.devtools : Vue.config.devtools;
+    if (useDevtools) {
+      devtoolPlugin(this);
+    }
+  };
+
+  var prototypeAccessors$1 = { state: { configurable: true } };
+
+  prototypeAccessors$1.state.get = function () {
+    return this._vm._data.$$state
+  };
+
+  prototypeAccessors$1.state.set = function (v) {
+    {
+      assert(false, "use store.replaceState() to explicit replace store state.");
+    }
+  };
+
+  Store.prototype.commit = function commit (_type, _payload, _options) {
+      var this$1 = this;
+
+    // check object-style commit
+    var ref = unifyObjectStyle(_type, _payload, _options);
+      var type = ref.type;
+      var payload = ref.payload;
+      var options = ref.options;
+
+    var mutation = { type: type, payload: payload };
+    var entry = this._mutations[type];
+    if (!entry) {
+      {
+        console.error(("[vuex] unknown mutation type: " + type));
+      }
+      return
+    }
+    this._withCommit(function () {
+      entry.forEach(function commitIterator (handler) {
+        handler(payload);
+      });
+    });
+
+    this._subscribers
+      .slice() // shallow copy to prevent iterator invalidation if subscriber synchronously calls unsubscribe
+      .forEach(function (sub) { return sub(mutation, this$1.state); });
+
+    if (
+      
+      options && options.silent
+    ) {
+      console.warn(
+        "[vuex] mutation type: " + type + ". Silent option has been removed. " +
+        'Use the filter functionality in the vue-devtools'
+      );
+    }
+  };
+
+  Store.prototype.dispatch = function dispatch (_type, _payload) {
+      var this$1 = this;
+
+    // check object-style dispatch
+    var ref = unifyObjectStyle(_type, _payload);
+      var type = ref.type;
+      var payload = ref.payload;
+
+    var action = { type: type, payload: payload };
+    var entry = this._actions[type];
+    if (!entry) {
+      {
+        console.error(("[vuex] unknown action type: " + type));
+      }
+      return
+    }
+
+    try {
+      this._actionSubscribers
+        .slice() // shallow copy to prevent iterator invalidation if subscriber synchronously calls unsubscribe
+        .filter(function (sub) { return sub.before; })
+        .forEach(function (sub) { return sub.before(action, this$1.state); });
+    } catch (e) {
+      {
+        console.warn("[vuex] error in before action subscribers: ");
+        console.error(e);
+      }
+    }
+
+    var result = entry.length > 1
+      ? Promise.all(entry.map(function (handler) { return handler(payload); }))
+      : entry[0](payload);
+
+    return new Promise(function (resolve, reject) {
+      result.then(function (res) {
+        try {
+          this$1._actionSubscribers
+            .filter(function (sub) { return sub.after; })
+            .forEach(function (sub) { return sub.after(action, this$1.state); });
+        } catch (e) {
+          {
+            console.warn("[vuex] error in after action subscribers: ");
+            console.error(e);
+          }
+        }
+        resolve(res);
+      }, function (error) {
+        try {
+          this$1._actionSubscribers
+            .filter(function (sub) { return sub.error; })
+            .forEach(function (sub) { return sub.error(action, this$1.state, error); });
+        } catch (e) {
+          {
+            console.warn("[vuex] error in error action subscribers: ");
+            console.error(e);
+          }
+        }
+        reject(error);
+      });
+    })
+  };
+
+  Store.prototype.subscribe = function subscribe (fn, options) {
+    return genericSubscribe(fn, this._subscribers, options)
+  };
+
+  Store.prototype.subscribeAction = function subscribeAction (fn, options) {
+    var subs = typeof fn === 'function' ? { before: fn } : fn;
+    return genericSubscribe(subs, this._actionSubscribers, options)
+  };
+
+  Store.prototype.watch = function watch (getter, cb, options) {
+      var this$1 = this;
+
+    {
+      assert(typeof getter === 'function', "store.watch only accepts a function.");
+    }
+    return this._watcherVM.$watch(function () { return getter(this$1.state, this$1.getters); }, cb, options)
+  };
+
+  Store.prototype.replaceState = function replaceState (state) {
+      var this$1 = this;
+
+    this._withCommit(function () {
+      this$1._vm._data.$$state = state;
+    });
+  };
+
+  Store.prototype.registerModule = function registerModule (path, rawModule, options) {
+      if ( options === void 0 ) options = {};
+
+    if (typeof path === 'string') { path = [path]; }
+
+    {
+      assert(Array.isArray(path), "module path must be a string or an Array.");
+      assert(path.length > 0, 'cannot register the root module by using registerModule.');
+    }
+
+    this._modules.register(path, rawModule);
+    installModule(this, this.state, path, this._modules.get(path), options.preserveState);
+    // reset store to update getters...
+    resetStoreVM(this, this.state);
+  };
+
+  Store.prototype.unregisterModule = function unregisterModule (path) {
+      var this$1 = this;
+
+    if (typeof path === 'string') { path = [path]; }
+
+    {
+      assert(Array.isArray(path), "module path must be a string or an Array.");
+    }
+
+    this._modules.unregister(path);
+    this._withCommit(function () {
+      var parentState = getNestedState(this$1.state, path.slice(0, -1));
+      Vue.delete(parentState, path[path.length - 1]);
+    });
+    resetStore(this);
+  };
+
+  Store.prototype.hasModule = function hasModule (path) {
+    if (typeof path === 'string') { path = [path]; }
+
+    {
+      assert(Array.isArray(path), "module path must be a string or an Array.");
+    }
+
+    return this._modules.isRegistered(path)
+  };
+
+  Store.prototype.hotUpdate = function hotUpdate (newOptions) {
+    this._modules.update(newOptions);
+    resetStore(this, true);
+  };
+
+  Store.prototype._withCommit = function _withCommit (fn) {
+    var committing = this._committing;
+    this._committing = true;
+    fn();
+    this._committing = committing;
+  };
+
+  Object.defineProperties( Store.prototype, prototypeAccessors$1 );
+
+  function genericSubscribe (fn, subs, options) {
+    if (subs.indexOf(fn) < 0) {
+      options && options.prepend
+        ? subs.unshift(fn)
+        : subs.push(fn);
+    }
+    return function () {
+      var i = subs.indexOf(fn);
+      if (i > -1) {
+        subs.splice(i, 1);
+      }
+    }
+  }
+
+  function resetStore (store, hot) {
+    store._actions = Object.create(null);
+    store._mutations = Object.create(null);
+    store._wrappedGetters = Object.create(null);
+    store._modulesNamespaceMap = Object.create(null);
+    var state = store.state;
+    // init all modules
+    installModule(store, state, [], store._modules.root, true);
+    // reset vm
+    resetStoreVM(store, state, hot);
+  }
+
+  function resetStoreVM (store, state, hot) {
+    var oldVm = store._vm;
+
+    // bind store public getters
+    store.getters = {};
+    // reset local getters cache
+    store._makeLocalGettersCache = Object.create(null);
+    var wrappedGetters = store._wrappedGetters;
+    var computed = {};
+    forEachValue(wrappedGetters, function (fn, key) {
+      // use computed to leverage its lazy-caching mechanism
+      // direct inline function use will lead to closure preserving oldVm.
+      // using partial to return function with only arguments preserved in closure environment.
+      computed[key] = partial(fn, store);
+      Object.defineProperty(store.getters, key, {
+        get: function () { return store._vm[key]; },
+        enumerable: true // for local getters
+      });
+    });
+
+    // use a Vue instance to store the state tree
+    // suppress warnings just in case the user has added
+    // some funky global mixins
+    var silent = Vue.config.silent;
+    Vue.config.silent = true;
+    store._vm = new Vue({
+      data: {
+        $$state: state
+      },
+      computed: computed
+    });
+    Vue.config.silent = silent;
+
+    // enable strict mode for new vm
+    if (store.strict) {
+      enableStrictMode(store);
+    }
+
+    if (oldVm) {
+      if (hot) {
+        // dispatch changes in all subscribed watchers
+        // to force getter re-evaluation for hot reloading.
+        store._withCommit(function () {
+          oldVm._data.$$state = null;
+        });
+      }
+      Vue.nextTick(function () { return oldVm.$destroy(); });
+    }
+  }
+
+  function installModule (store, rootState, path, module, hot) {
+    var isRoot = !path.length;
+    var namespace = store._modules.getNamespace(path);
+
+    // register in namespace map
+    if (module.namespaced) {
+      if (store._modulesNamespaceMap[namespace] && true) {
+        console.error(("[vuex] duplicate namespace " + namespace + " for the namespaced module " + (path.join('/'))));
+      }
+      store._modulesNamespaceMap[namespace] = module;
+    }
+
+    // set state
+    if (!isRoot && !hot) {
+      var parentState = getNestedState(rootState, path.slice(0, -1));
+      var moduleName = path[path.length - 1];
+      store._withCommit(function () {
+        {
+          if (moduleName in parentState) {
+            console.warn(
+              ("[vuex] state field \"" + moduleName + "\" was overridden by a module with the same name at \"" + (path.join('.')) + "\"")
+            );
+          }
+        }
+        Vue.set(parentState, moduleName, module.state);
+      });
+    }
+
+    var local = module.context = makeLocalContext(store, namespace, path);
+
+    module.forEachMutation(function (mutation, key) {
+      var namespacedType = namespace + key;
+      registerMutation(store, namespacedType, mutation, local);
+    });
+
+    module.forEachAction(function (action, key) {
+      var type = action.root ? key : namespace + key;
+      var handler = action.handler || action;
+      registerAction(store, type, handler, local);
+    });
+
+    module.forEachGetter(function (getter, key) {
+      var namespacedType = namespace + key;
+      registerGetter(store, namespacedType, getter, local);
+    });
+
+    module.forEachChild(function (child, key) {
+      installModule(store, rootState, path.concat(key), child, hot);
+    });
+  }
+
+  /**
+   * make localized dispatch, commit, getters and state
+   * if there is no namespace, just use root ones
+   */
+  function makeLocalContext (store, namespace, path) {
+    var noNamespace = namespace === '';
+
+    var local = {
+      dispatch: noNamespace ? store.dispatch : function (_type, _payload, _options) {
+        var args = unifyObjectStyle(_type, _payload, _options);
+        var payload = args.payload;
+        var options = args.options;
+        var type = args.type;
+
+        if (!options || !options.root) {
+          type = namespace + type;
+          if ( !store._actions[type]) {
+            console.error(("[vuex] unknown local action type: " + (args.type) + ", global type: " + type));
+            return
+          }
+        }
+
+        return store.dispatch(type, payload)
+      },
+
+      commit: noNamespace ? store.commit : function (_type, _payload, _options) {
+        var args = unifyObjectStyle(_type, _payload, _options);
+        var payload = args.payload;
+        var options = args.options;
+        var type = args.type;
+
+        if (!options || !options.root) {
+          type = namespace + type;
+          if ( !store._mutations[type]) {
+            console.error(("[vuex] unknown local mutation type: " + (args.type) + ", global type: " + type));
+            return
+          }
+        }
+
+        store.commit(type, payload, options);
+      }
+    };
+
+    // getters and state object must be gotten lazily
+    // because they will be changed by vm update
+    Object.defineProperties(local, {
+      getters: {
+        get: noNamespace
+          ? function () { return store.getters; }
+          : function () { return makeLocalGetters(store, namespace); }
+      },
+      state: {
+        get: function () { return getNestedState(store.state, path); }
+      }
+    });
+
+    return local
+  }
+
+  function makeLocalGetters (store, namespace) {
+    if (!store._makeLocalGettersCache[namespace]) {
+      var gettersProxy = {};
+      var splitPos = namespace.length;
+      Object.keys(store.getters).forEach(function (type) {
+        // skip if the target getter is not match this namespace
+        if (type.slice(0, splitPos) !== namespace) { return }
+
+        // extract local getter type
+        var localType = type.slice(splitPos);
+
+        // Add a port to the getters proxy.
+        // Define as getter property because
+        // we do not want to evaluate the getters in this time.
+        Object.defineProperty(gettersProxy, localType, {
+          get: function () { return store.getters[type]; },
+          enumerable: true
+        });
+      });
+      store._makeLocalGettersCache[namespace] = gettersProxy;
+    }
+
+    return store._makeLocalGettersCache[namespace]
+  }
+
+  function registerMutation (store, type, handler, local) {
+    var entry = store._mutations[type] || (store._mutations[type] = []);
+    entry.push(function wrappedMutationHandler (payload) {
+      handler.call(store, local.state, payload);
+    });
+  }
+
+  function registerAction (store, type, handler, local) {
+    var entry = store._actions[type] || (store._actions[type] = []);
+    entry.push(function wrappedActionHandler (payload) {
+      var res = handler.call(store, {
+        dispatch: local.dispatch,
+        commit: local.commit,
+        getters: local.getters,
+        state: local.state,
+        rootGetters: store.getters,
+        rootState: store.state
+      }, payload);
+      if (!isPromise(res)) {
+        res = Promise.resolve(res);
+      }
+      if (store._devtoolHook) {
+        return res.catch(function (err) {
+          store._devtoolHook.emit('vuex:error', err);
+          throw err
+        })
+      } else {
+        return res
+      }
+    });
+  }
+
+  function registerGetter (store, type, rawGetter, local) {
+    if (store._wrappedGetters[type]) {
+      {
+        console.error(("[vuex] duplicate getter key: " + type));
+      }
+      return
+    }
+    store._wrappedGetters[type] = function wrappedGetter (store) {
+      return rawGetter(
+        local.state, // local state
+        local.getters, // local getters
+        store.state, // root state
+        store.getters // root getters
+      )
+    };
+  }
+
+  function enableStrictMode (store) {
+    store._vm.$watch(function () { return this._data.$$state }, function () {
+      {
+        assert(store._committing, "do not mutate vuex store state outside mutation handlers.");
+      }
+    }, { deep: true, sync: true });
+  }
+
+  function getNestedState (state, path) {
+    return path.reduce(function (state, key) { return state[key]; }, state)
+  }
+
+  function unifyObjectStyle (type, payload, options) {
+    if (isObject(type) && type.type) {
+      options = payload;
+      payload = type;
+      type = type.type;
+    }
+
+    {
+      assert(typeof type === 'string', ("expects string as the type, but found " + (typeof type) + "."));
+    }
+
+    return { type: type, payload: payload, options: options }
+  }
+
+  function install (_Vue) {
+    if (Vue && _Vue === Vue) {
+      {
+        console.error(
+          '[vuex] already installed. Vue.use(Vuex) should be called only once.'
+        );
+      }
+      return
+    }
+    Vue = _Vue;
+    applyMixin(Vue);
+  }
+
+  /**
+   * Reduce the code which written in Vue.js for getting the state.
+   * @param {String} [namespace] - Module's namespace
+   * @param {Object|Array} states # Object's item can be a function which accept state and getters for param, you can do something for state and getters in it.
+   * @param {Object}
+   */
+  var mapState = normalizeNamespace(function (namespace, states) {
+    var res = {};
+    if ( !isValidMap(states)) {
+      console.error('[vuex] mapState: mapper parameter must be either an Array or an Object');
+    }
+    normalizeMap(states).forEach(function (ref) {
+      var key = ref.key;
+      var val = ref.val;
+
+      res[key] = function mappedState () {
+        var state = this.$store.state;
+        var getters = this.$store.getters;
+        if (namespace) {
+          var module = getModuleByNamespace(this.$store, 'mapState', namespace);
+          if (!module) {
+            return
+          }
+          state = module.context.state;
+          getters = module.context.getters;
+        }
+        return typeof val === 'function'
+          ? val.call(this, state, getters)
+          : state[val]
+      };
+      // mark vuex getter for devtools
+      res[key].vuex = true;
+    });
+    return res
+  });
+
+  /**
+   * Reduce the code which written in Vue.js for committing the mutation
+   * @param {String} [namespace] - Module's namespace
+   * @param {Object|Array} mutations # Object's item can be a function which accept `commit` function as the first param, it can accept anthor params. You can commit mutation and do any other things in this function. specially, You need to pass anthor params from the mapped function.
+   * @return {Object}
+   */
+  var mapMutations = normalizeNamespace(function (namespace, mutations) {
+    var res = {};
+    if ( !isValidMap(mutations)) {
+      console.error('[vuex] mapMutations: mapper parameter must be either an Array or an Object');
+    }
+    normalizeMap(mutations).forEach(function (ref) {
+      var key = ref.key;
+      var val = ref.val;
+
+      res[key] = function mappedMutation () {
+        var args = [], len = arguments.length;
+        while ( len-- ) args[ len ] = arguments[ len ];
+
+        // Get the commit method from store
+        var commit = this.$store.commit;
+        if (namespace) {
+          var module = getModuleByNamespace(this.$store, 'mapMutations', namespace);
+          if (!module) {
+            return
+          }
+          commit = module.context.commit;
+        }
+        return typeof val === 'function'
+          ? val.apply(this, [commit].concat(args))
+          : commit.apply(this.$store, [val].concat(args))
+      };
+    });
+    return res
+  });
+
+  /**
+   * Reduce the code which written in Vue.js for getting the getters
+   * @param {String} [namespace] - Module's namespace
+   * @param {Object|Array} getters
+   * @return {Object}
+   */
+  var mapGetters = normalizeNamespace(function (namespace, getters) {
+    var res = {};
+    if ( !isValidMap(getters)) {
+      console.error('[vuex] mapGetters: mapper parameter must be either an Array or an Object');
+    }
+    normalizeMap(getters).forEach(function (ref) {
+      var key = ref.key;
+      var val = ref.val;
+
+      // The namespace has been mutated by normalizeNamespace
+      val = namespace + val;
+      res[key] = function mappedGetter () {
+        if (namespace && !getModuleByNamespace(this.$store, 'mapGetters', namespace)) {
+          return
+        }
+        if ( !(val in this.$store.getters)) {
+          console.error(("[vuex] unknown getter: " + val));
+          return
+        }
+        return this.$store.getters[val]
+      };
+      // mark vuex getter for devtools
+      res[key].vuex = true;
+    });
+    return res
+  });
+
+  /**
+   * Reduce the code which written in Vue.js for dispatch the action
+   * @param {String} [namespace] - Module's namespace
+   * @param {Object|Array} actions # Object's item can be a function which accept `dispatch` function as the first param, it can accept anthor params. You can dispatch action and do any other things in this function. specially, You need to pass anthor params from the mapped function.
+   * @return {Object}
+   */
+  var mapActions = normalizeNamespace(function (namespace, actions) {
+    var res = {};
+    if ( !isValidMap(actions)) {
+      console.error('[vuex] mapActions: mapper parameter must be either an Array or an Object');
+    }
+    normalizeMap(actions).forEach(function (ref) {
+      var key = ref.key;
+      var val = ref.val;
+
+      res[key] = function mappedAction () {
+        var args = [], len = arguments.length;
+        while ( len-- ) args[ len ] = arguments[ len ];
+
+        // get dispatch function from store
+        var dispatch = this.$store.dispatch;
+        if (namespace) {
+          var module = getModuleByNamespace(this.$store, 'mapActions', namespace);
+          if (!module) {
+            return
+          }
+          dispatch = module.context.dispatch;
+        }
+        return typeof val === 'function'
+          ? val.apply(this, [dispatch].concat(args))
+          : dispatch.apply(this.$store, [val].concat(args))
+      };
+    });
+    return res
+  });
+
+  /**
+   * Rebinding namespace param for mapXXX function in special scoped, and return them by simple object
+   * @param {String} namespace
+   * @return {Object}
+   */
+  var createNamespacedHelpers = function (namespace) { return ({
+    mapState: mapState.bind(null, namespace),
+    mapGetters: mapGetters.bind(null, namespace),
+    mapMutations: mapMutations.bind(null, namespace),
+    mapActions: mapActions.bind(null, namespace)
+  }); };
+
+  /**
+   * Normalize the map
+   * normalizeMap([1, 2, 3]) => [ { key: 1, val: 1 }, { key: 2, val: 2 }, { key: 3, val: 3 } ]
+   * normalizeMap({a: 1, b: 2, c: 3}) => [ { key: 'a', val: 1 }, { key: 'b', val: 2 }, { key: 'c', val: 3 } ]
+   * @param {Array|Object} map
+   * @return {Object}
+   */
+  function normalizeMap (map) {
+    if (!isValidMap(map)) {
+      return []
+    }
+    return Array.isArray(map)
+      ? map.map(function (key) { return ({ key: key, val: key }); })
+      : Object.keys(map).map(function (key) { return ({ key: key, val: map[key] }); })
+  }
+
+  /**
+   * Validate whether given map is valid or not
+   * @param {*} map
+   * @return {Boolean}
+   */
+  function isValidMap (map) {
+    return Array.isArray(map) || isObject(map)
+  }
+
+  /**
+   * Return a function expect two param contains namespace and map. it will normalize the namespace and then the param's function will handle the new namespace and the map.
+   * @param {Function} fn
+   * @return {Function}
+   */
+  function normalizeNamespace (fn) {
+    return function (namespace, map) {
+      if (typeof namespace !== 'string') {
+        map = namespace;
+        namespace = '';
+      } else if (namespace.charAt(namespace.length - 1) !== '/') {
+        namespace += '/';
+      }
+      return fn(namespace, map)
+    }
+  }
+
+  /**
+   * Search a special module from store by namespace. if module not exist, print error message.
+   * @param {Object} store
+   * @param {String} helper
+   * @param {String} namespace
+   * @return {Object}
+   */
+  function getModuleByNamespace (store, helper, namespace) {
+    var module = store._modulesNamespaceMap[namespace];
+    if ( !module) {
+      console.error(("[vuex] module namespace not found in " + helper + "(): " + namespace));
+    }
+    return module
+  }
+
+  var index_cjs = {
+    Store: Store,
+    install: install,
+    version: '3.4.0',
+    mapState: mapState,
+    mapMutations: mapMutations,
+    mapGetters: mapGetters,
+    mapActions: mapActions,
+    createNamespacedHelpers: createNamespacedHelpers
+  };
+
+  return index_cjs;
+
+})));

docs/.vuepress/config.js

@@ -310,7 +310,7 @@ module.exports = {
                   link: '/fr/api/'
               },
               {
-                  text: 'Notes de release',
+                  text: 'Notes de version',
                   link: 'https://github.com/vuejs/vuex/releases'
               }
           ],

docs/fr/guide/plugins.md

@@ -107,7 +107,7 @@ const logger = createLogger({
   filter (mutation, stateBefore, stateAfter) {
     // retourne `true` si une mutation devrait être logguée
     // `mutation` est un `{ type, payload }`
-    return mutation.type !== "aBlacklistedMutation"
+    return mutation.type !== "aBlocklistedMutation"
   },
   transformer (state) {
     // transforme l'état avant de le logguer.

docs/guide/hot-reload.md

@@ -42,3 +42,50 @@ if (module.hot) {
 ```
 
 Checkout the [counter-hot example](https://github.com/vuejs/vuex/tree/dev/examples/counter-hot) to play with hot-reload.
+
+## Dynamic module hot reloading
+
+If you use modules exclusively, you can use `require.context` to load and hot reload all modules dynamically.
+
+```js
+// store.js
+import Vue from 'vue'
+import Vuex from 'vuex'
+
+// Load all modules.
+function loadModules() {
+  const context = require.context("./modules", false, /([a-z_]+)\.js$/i)
+
+  const modules = context
+    .keys()
+    .map((key) => ({ key, name: key.match(/([a-z_]+)\.js$/i)[1] }))
+    .reduce(
+      (modules, { key, name }) => ({
+        ...modules,
+        [name]: context(key).default
+      }),
+      {}
+    )
+
+  return { context, modules }
+}
+
+const { context, modules } = loadModules()
+
+Vue.use(Vuex)
+
+const store = new Vuex.Store({
+  modules
+})
+
+if (module.hot) {
+  // Hot reload whenever any module changes.
+  module.hot.accept(context.id, () => {
+    const { modules } = loadModules()
+
+    store.hotUpdate({
+      modules
+    })
+  })
+}
+```

docs/guide/modules.md

@@ -209,7 +209,11 @@ computed: {
   ...mapState({
     a: state => state.some.nested.module.a,
     b: state => state.some.nested.module.b
-  })
+  }),
+  ...mapGetters([
+    'some/nested/module/someGetter', // -> this['some/nested/module/someGetter']
+    'some/nested/module/someOtherGetter', // -> this['some/nested/module/someOtherGetter']
+  ])
 },
 methods: {
   ...mapActions([
@@ -226,7 +230,11 @@ computed: {
   ...mapState('some/nested/module', {
     a: state => state.a,
     b: state => state.b
-  })
+  }),
+  ...mapGetters('some/nested/module', [
+    'someGetter', // -> this.someGetter
+    'someOtherGetter', // -> this.someOtherGetter
+  ])
 },
 methods: {
   ...mapActions('some/nested/module', [

docs/guide/plugins.md

@@ -107,12 +107,12 @@ const logger = createLogger({
   filter (mutation, stateBefore, stateAfter) {
     // returns `true` if a mutation should be logged
     // `mutation` is a `{ type, payload }`
-    return mutation.type !== "aBlacklistedMutation"
+    return mutation.type !== "aBlocklistedMutation"
   },
   actionFilter (action, state) {
     // same as `filter` but for actions
     // `action` is a `{ type, payload }`
-    return action.type !== "aBlacklistedAction"
+    return action.type !== "aBlocklistedAction"
   },
   transformer (state) {
     // transform the state before logging it.

docs/ja/README.md

@@ -65,6 +65,6 @@ new Vue({
 
 Vuex は、共有状態の管理に役立ちますが、さらに概念やボイラープレートのコストがかかります。これは、短期的生産性と長期的生産性のトレードオフです。
 
-もし、あなたが大規模な SPA を構築することなく、Vuex を導入した場合、冗長で恐ろしいと感じるかもしれません。そう感じることは全く普通です。あなたのアプリがシンプルであれば、Vuex なしで問題ないでしょう。単純な [ストアパターン](https://jp.vuejs.org/v2/guide/state-management.html#%E3%82%B7%E3%83%B3%E3%83%97%E3%83%AB%E3%81%AA%E7%8A%B6%E6%85%8B%E7%AE%A1%E7%90%86%E3%82%92%E3%82%BC%E3%83%AD%E3%81%8B%E3%82%89%E4%BD%9C%E3%82%8B) が必要なだけかもしれません。しかし、中規模から大規模の SPA を構築する場合は、Vue コンポーネントの外の状態をどうやってうまく扱うか考える絶好の機会です。Vuex は自然な次のステップとなるでしょう。これは Redux の作者、Dan Abramov からの良い引用です:
+もし、あなたが大規模な SPA を構築することなく、Vuex を導入した場合、冗長で気が遠くなるように感じるかもしれません。そう感じることは全く普通です。あなたのアプリがシンプルであれば、Vuex なしで問題ないでしょう。単純な [ストアパターン](https://jp.vuejs.org/v2/guide/state-management.html#%E3%82%B7%E3%83%B3%E3%83%97%E3%83%AB%E3%81%AA%E7%8A%B6%E6%85%8B%E7%AE%A1%E7%90%86%E3%82%92%E3%82%BC%E3%83%AD%E3%81%8B%E3%82%89%E4%BD%9C%E3%82%8B) が必要なだけかもしれません。しかし、今あなたが中規模から大規模の SPA を構築しているなら、Vue コンポーネントの外の状態をもっとうまく扱えないか考えなくてはならない状況にあるかもしれません。その場合 Vuex は次のステップとして最適でしょう。これは Redux の作者、Dan Abramov からの良い引用です:
 
-> Flux ライブラリは眼鏡のようなものです: それらが必要になったときに知るのです。
+> Flux ライブラリは眼鏡のようなものです: あなたが必要な時にいつでも分かるのです。

docs/ja/api/README.md

@@ -234,7 +234,20 @@ const store = new Vuex.Store({ ...options })
   })
   ```
 
-　プラグインで最も一般的に使用されます。[詳細](../guide/plugins.md)
+  > 3.4.0 で新規追加
+
+  3.4.0から、`subscribeAction` に `error` ハンドラが追加されました。このハンドラでは、アクションディスパッチの中で投げられたエラーをキャッチすることができます。`error` ハンドラは投げられた `error` オブジェクトを第3引数として受け取ります。
+
+  ``` js
+  store.subscribeAction({
+    error: (action, state, error) => {
+      console.log(`error action ${action.type}`)
+      console.error(error)
+    }
+  })
+  ```
+
+　`subscribeAction` メソッドはプラグインで最も一般的に使用されます。[詳細](../guide/plugins.md)
 
 ### registerModule
 

docs/ja/guide/hot-reload.md

@@ -42,3 +42,50 @@ if (module.hot) {
 ```
 
 ホットリローディングを試したい場合は、[counter-hot example](https://github.com/vuejs/vuex/tree/dev/examples/counter-hot)をチェックアウトしてください。
+
+## 動的モジュールホットリローディング
+
+もしストアでモジュールだけを使用している場合には、`require.context` を使って全てのモジュールを動的に読み込むこともできます。
+
+```js
+// store.js
+import Vue from 'vue'
+import Vuex from 'vuex'
+
+// 全てのモジュールをロードする
+function loadModules() {
+  const context = require.context("./modules", false, /([a-z_]+)\.js$/i)
+
+  const modules = context
+    .keys()
+    .map((key) => ({ key, name: key.match(/([a-z_]+)\.js$/i)[1] }))
+    .reduce(
+      (modules, { key, name }) => ({
+        ...modules,
+        [name]: context(key).default
+      }),
+      {}
+    )
+
+  return { context, modules }
+}
+
+const { context, modules } = loadModules()
+
+Vue.use(Vuex)
+
+const store = new Vuex.Store({
+  modules
+})
+
+if (module.hot) {
+  // モジュールに変更があった場合にホットリロードする
+  module.hot.accept(context.id, () => {
+    const { modules } = loadModules()
+
+    store.hotUpdate({
+      modules
+    })
+  })
+}
+```

docs/ja/guide/modules.md

@@ -299,13 +299,13 @@ store.registerModule(['nested', 'myModule'], {
 
 `store.unregisterModule(moduleName)` を呼び出せば、動的に登録したモジュールを削除できます。ただしストア作成（store creation）の際に宣言された、静的なモジュールはこのメソッドで削除できないことに注意してください。
 
-また、すでに動的なモジュールが登録されているかどうかを `store.hasModule(moduleName)` メソッドを使って確認することができます。
+また、すでにモジュールが登録されているかどうかを `store.hasModule(moduleName)` メソッドを使って確認することができます。
 
 #### ステートの保持
 
 サーバサイドレンダリングされたアプリケーションから状態を保持するなど、新しいモジュールを登録するときに、以前の状態を保持したい場合があります。`preserveState` オプション（`store.registerModule('a', module, { preserveState: true })`）でこれを実現できます。
 
-`preserveState: true` を設定した場合、モジュールを登録する際、アクション、ミューテーション、そしてゲッターは登録されますがステートは登録されません。これはステートがすでにモジュールに登録されていることを前提としており、ステートを上書きしないようにするためです。
+`preserveState: true` を設定した場合、モジュールを登録する際に、アクション、ミューテーション、そしてゲッターは追加されますがステートは追加されません。これはストアのステートはすでにモジュールのステートを登録しているので、それを上書きしないようにするためです。
 
 ### モジュールの再利用
 
@@ -314,7 +314,7 @@ store.registerModule(['nested', 'myModule'], {
 - 同じモジュールを使用する複数のストアを作成する;
 - 同じストアに同じモジュールを複数回登録する
 
-モジュールの状態を宣言するために単純なオブジェクトを使用すると、その状態オブジェクトは参照によって共有され、変更時にクロスストア/モジュールの状態汚染を引き起こします。(例: `runInNewContext` オプションが `false` または `'once'` のとき、[SSR ではステートフルなシングルトンは避けます](https://ssr.vuejs.org/ja/structure.html#ステートフルなシングルトンの回避)。)
+モジュールの状態を宣言するために単純なオブジェクトを使用すると、その状態オブジェクトは参照によって共有され、変更時にクロスストア/モジュールの状態汚染を引き起こします。(例: `runInNewContext` オプションが `false` または `'once'` のとき、[SSR でステートフルなシングルトンを避けるためです](https://ssr.vuejs.org/ja/structure.html#ステートフルなシングルトンの回避)。)
 
 これは、実際には Vue コンポーネント内部の `data` と全く同じ問題です。従って解決策も同じです。モジュールの状態を宣言するために関数を使用してください (2.3.0 以降でサポートされます):
 

docs/ja/guide/plugins.md

@@ -25,9 +25,9 @@ const store = new Vuex.Store({
 
 ### プラグイン内でのミューテーションのコミット
 
-プラグインは直接、状態を変更できません。これはコンポーネントに似ています。プラグインはコンポーネント同様に、ミューテーションのコミットによる変更のトリガーだけで状態を変更できます。
+プラグインは直接、状態を変更できません。これはコンポーネントに似ています。プラグインはコンポーネント同様に、ミューテーションのコミットをトリガーすることで状態を変更できます。
 
-ミューテーションのコミットによるストアとデータソースの同期をプラグインで実現できます。 websocket データソースとストアを例にします (これは不自然な例です。実際には、さらに複雑なタスクのために `createWebSocketPlugin` 関数は、追加でいくつかのオプションを受け取れます):
+ミューテーションのコミットによるストアとデータソースの同期をプラグインで実現できます。 websocket データソースとストアを例にします (これは不自然で作為的な例です。実際には `createWebSocketPlugin` 関数は、さらに複雑なタスクのために追加でいくつかのオプションを受け取れます):
 
 ``` js
 export default function createWebSocketPlugin (socket) {
@@ -107,12 +107,12 @@ const logger = createLogger({
   filter (mutation, stateBefore, stateAfter) {
     // ミューテーションを記録する必要がある場合は、`true` を返します
     // `mutation` は `{ type, payload }` です
-    return mutation.type !== "aBlacklistedMutation"
+    return mutation.type !== "aBlocklistedMutation"
   },
   actionFilter (action, state) {
     // `filter` と同等ですが、アクション用です
     // `action` は `{ type, payloed }` です
-    return action.type !== "aBlacklistedAction"
+    return action.type !== "aBlocklistedAction"
   },
   transformer (state) {
     // ロギングの前に、状態を変換します

docs/kr/guide/actions.md

@@ -111,6 +111,9 @@ export default {
   methods: {
     ...mapActions([
       'increment' // this.increment()을 this.$store.dispatch('increment')에 매핑
+
+      // mapActions는 페이로드를 지원합니다.
+      'incrementBy' // this.incrementBy(amount)를 this.$store.dispatch('incrementBy', amount)에 매핑
     ]),
     ...mapActions({
       add: 'increment' // this.add()을 this.$store.dispatch('increment')에 매핑

docs/kr/guide/plugins.md

@@ -108,7 +108,7 @@ const logger = createLogger({
   filter (mutation, stateBefore, stateAfter) {
     // 변이시 항상 로깅해야 한다면 true 를 반환하십시오.
     // 변이는 { type, payload }의 포맷입니다.
-    return mutation.type !== "aBlacklistedMutation"
+    return mutation.type !== "aBlocklistedMutation"
   },
   transformer (state) {
     // 로깅하기전 상태를 변이 하십시오.

docs/ptbr/guide/plugins.md

@@ -107,7 +107,7 @@ const logger = createLogger({
   filter (mutation, stateBefore, stateAfter) {
     // retorna `true` se uma mutação deve ser registrada no log
     // `mutation` é um `{ type, payload }`
-    return mutation.type !== "aBlacklistedMutation"
+    return mutation.type !== "aBlocklistedMutation"
   },
   transformer (state) {
     // transforma o estado antes de regitrá-lo no log.

docs/ru/api/README.md

@@ -233,7 +233,20 @@ store.subscribeAction({
 })
 ```
 
-Чаще всего используется в плагинах. [Подробнее](../guide/plugins.md)
+> Добавлено в версии 3.4.0
+
+С версии 3.4.0 в `subscribeAction` также можно указывать обработчик `error` для перехвата ошибки, выброшенной при выполнении действия. В качестве третьего аргумента функция получает объект `error`.
+
+``` js
+store.subscribeAction({
+  error: (action, state, error) => {
+    console.log(`error action ${action.type}`)
+    console.error(error)
+  }
+})
+```
+
+Метод `subscribeAction` чаще всего используется в плагинах. [Подробнее](../guide/plugins.md)
 
 ### registerModule
 

docs/ru/guide/hot-reload.md

@@ -42,3 +42,50 @@ if (module.hot) {
 ```
 
 [Пример counter-hot](https://github.com/vuejs/vuex/tree/dev/examples/counter-hot) позволяет посмотреть на горячую перезагрузку в реальной жизни.
+
+## Горячая перезагрузка динамических модулей
+
+Если в приложении используются только модули, то можно использовать `require.context` для загрузки и горячей перезагрузки всех модулей динамически.
+
+```js
+// store.js
+import Vue from 'vue'
+import Vuex from 'vuex'
+
+// Загружаем все модули
+function loadModules() {
+  const context = require.context("./modules", false, /([a-z_]+)\.js$/i)
+
+  const modules = context
+    .keys()
+    .map((key) => ({ key, name: key.match(/([a-z_]+)\.js$/i)[1] }))
+    .reduce(
+      (modules, { key, name }) => ({
+        ...modules,
+        [name]: context(key).default
+      }),
+      {}
+    )
+
+  return { context, modules }
+}
+
+const { context, modules } = loadModules()
+
+Vue.use(Vuex)
+
+const store = new Vuex.Store({
+  modules
+})
+
+if (module.hot) {
+  // Горячая перезагрузка при любых изменениях модуля
+  module.hot.accept(context.id, () => {
+    const { modules } = loadModules()
+
+    store.hotUpdate({
+      modules
+    })
+  })
+}
+```

docs/ru/guide/plugins.md

@@ -105,12 +105,12 @@ const logger = createLogger({
   filter(mutation, stateBefore, stateAfter) {
     // возвращает `true`, если мутация должна быть залогирована
     // `mutation` — это объект `{ type, payload }`
-    return mutation.type !== 'aBlacklistedMutation';
+    return mutation.type !== 'aBlocklistedMutation';
   },
   actionFilter (action, state) {
     // аналогично `filter`, но для действий
     // `action` будет объектом `{ type, payload }`
-    return action.type !== 'aBlacklistedAction'
+    return action.type !== 'aBlocklistedAction'
   },
   transformer(state) {
     // обработать состояние перед логированием

docs/zh/api/README.md

@@ -176,7 +176,7 @@ const store = new Vuex.Store({ ...options })
 
 ### subscribe
 
-- `subscribe(handler: Function): Function`
+- `subscribe(handler: Function, options?: Object): Function`
 
   订阅 store 的 mutation。`handler` 会在每个 mutation 完成后调用，接收 mutation 和经过 mutation 后的状态作为参数：
 
@@ -187,13 +187,18 @@ const store = new Vuex.Store({ ...options })
   })
   ```
 
+  默认情况下，新的处理函数会被添加到其链的尾端，因此它会在其它之前已经被添加了的处理函数之后执行。这一行为可以通过向 `options` 添加 `prepend: true` 来覆写，即把处理函数添加到其链的最开始。
+
+  ``` js
+  store.subscribe(handler, { prepend: true })
+  ```
   要停止订阅，调用此方法返回的函数即可停止订阅。
 
   通常用于插件。[详细介绍](../guide/plugins.md)
 
 ### subscribeAction
 
-- `subscribeAction(handler: Function): Function`
+- `subscribeAction(handler: Function, options?: Object): Function`
 
   > 2.5.0 新增
 
@@ -206,6 +211,12 @@ const store = new Vuex.Store({ ...options })
   })
   ```
 
+  默认情况下，新的处理函数会被添加到其链的尾端，因此它会在其它之前已经被添加了的处理函数之后执行。这一行为可以通过向 `options` 添加 `prepend: true` 来覆写，即把处理函数添加到其链的最开始。
+
+  ``` js
+  store.subscribeAction(handler, { prepend: true })
+  ```
+
   要停止订阅，调用此方法返回的函数即可停止订阅。
 
   > 3.1.0 新增
@@ -223,7 +234,20 @@ const store = new Vuex.Store({ ...options })
   })
   ```
 
-  该功能常用于插件。[详细介绍](../guide/plugins.md)
+  > 3.4.0 新增
+
+  自 3.4.0 起，`subscribeAction` 也可以指定一个 `error` 处理函数以捕获分发 action 的时候被抛出的错误。该函数会从第三个参数接收到一个 `error` 对象。
+
+  ``` js
+  store.subscribeAction({
+    error: (action, state, error) => {
+      console.log(`error action ${action.type}`)
+      console.error(error)
+    }
+  })
+  ```
+
+  该 `subscribeAction` 方法常用于插件。[详细介绍](../guide/plugins.md)
 
 ### registerModule
 

docs/zh/guide/README.md

@@ -20,6 +20,8 @@
 import Vue from 'vue'
 import Vuex from 'vuex'
 
+Vue.use(Vuex);
+
 const store = new Vuex.Store({
   state: {
     count: 0

docs/zh/guide/hot-reload.md

@@ -42,3 +42,50 @@ if (module.hot) {
 ```
 
 参考热重载示例 [counter-hot](https://github.com/vuejs/vuex/tree/dev/examples/counter-hot)。
+
+## 动态模块热重载
+
+如果你仅使用模块，你可以使用 `require.context` 来动态地加载或热重载所有的模块。
+
+```js
+// store.js
+import Vue from 'vue'
+import Vuex from 'vuex'
+
+// 加载所有模块。
+function loadModules() {
+  const context = require.context("./modules", false, /([a-z_]+)\.js$/i)
+
+  const modules = context
+    .keys()
+    .map((key) => ({ key, name: key.match(/([a-z_]+)\.js$/i)[1] }))
+    .reduce(
+      (modules, { key, name }) => ({
+        ...modules,
+        [name]: context(key).default
+      }),
+      {}
+    )
+
+  return { context, modules }
+}
+
+const { context, modules } = loadModules()
+
+Vue.use(Vuex)
+
+const store = new Vuex.Store({
+  modules
+})
+
+if (module.hot) {
+  // 在任何模块发生改变时进行热重载。
+  module.hot.accept(context.id, () => {
+    const { modules } = loadModules()
+
+    store.hotUpdate({
+      modules
+    })
+  })
+}
+```

docs/zh/guide/plugins.md

@@ -107,7 +107,12 @@ const logger = createLogger({
   filter (mutation, stateBefore, stateAfter) {
     // 若 mutation 需要被记录，就让它返回 true 即可
     // 顺便，`mutation` 是个 { type, payload } 对象
-    return mutation.type !== "aBlacklistedMutation"
+    return mutation.type !== "aBlocklistedMutation"
+  },
+  actionFilter (action, state) {
+    // 和 `filter` 一样，但是是针对 action 的
+    // `action` 的格式是 `{ type, payload }`
+    return action.type !== "aBlocklistedAction"
   },
   transformer (state) {
     // 在开始记录之前转换状态
@@ -119,6 +124,12 @@ const logger = createLogger({
     // 我们可以按任意方式格式化
     return mutation.type
   },
+  actionTransformer (action) {
+    // 和 `mutationTransformer` 一样，但是是针对 action 的
+    return action.type
+  },
+  logActions: true, // 记录 action 日志
+  logMutations: true, // 记录 mutation 日志
   logger: console, // 自定义 console 实现，默认为 `console`
 })
 ```

test/unit/util.spec.js

@@ -1,11 +1,16 @@
 import { find, deepCopy, forEachValue, isObject, isPromise, assert } from '@/util'
 
 describe('util', () => {
-  it('find', () => {
+  it('find: returns item when it was found', () => {
     const list = [33, 22, 112, 222, 43]
     expect(find(list, function (a) { return a % 2 === 0 })).toEqual(22)
   })
 
+  it('find: returns undefined when item was not found', () => {
+    const list = [1, 2, 3]
+    expect(find(list, function (a) { return a === 9000 })).toEqual(undefined)
+  })
+
   it('deepCopy: normal structure', () => {
     const original = {
       a: 1,