text: /**
   * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
   *
   * This source code is licensed under the BSD-style license found in the
   * LICENSE file in the root directory of this source tree. An additional grant
   * of patent rights can be found in the PATENTS file in the same directory.
   *
   * @providesModule FluxMixinLegacy
   * 
   */
  'use strict';
  
  function _createForOfIteratorHelper(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it["return"] != null) it["return"](); } finally { if (didErr) throw err; } } }; }
  
  function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
  
  function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
  
  var FluxStoreGroup = require("./FluxStoreGroup");
  
  var invariant = require("fbjs/lib/invariant");
  
  /**
   * `FluxContainer` should be preferred over this mixin, but it requires using
   * react with classes. So this mixin is provided where it is not yet possible
   * to convert a container to be a class.
   *
   * This mixin should be used for React components that have state based purely
   * on stores. `this.props` will not be available inside of `calculateState()`.
   *
   * This mixin will only `setState` not replace it, so you should always return
   * every key in your state unless you know what you are doing. Consider this:
   *
   *   var Foo = React.createClass({
   *     mixins: [
   *       FluxMixinLegacy([FooStore])
   *     ],
   *
   *     statics: {
   *       calculateState(prevState) {
   *         if (!prevState) {
   *           return {
   *             foo: FooStore.getFoo(),
   *           };
   *         }
   *
   *         return {
   *           bar: FooStore.getBar(),
   *         };
   *       }
   *     },
   *   });
   *
   * On the second calculateState when prevState is not null, the state will be
   * updated to contain the previous foo AND the bar that was just returned. Only
   * returning bar will not delete foo.
   *
   */
  function FluxMixinLegacy(stores) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
      withProps: false
    };
    stores = stores.filter(function (store) {
      return !!store;
    });
    return {
      getInitialState: function getInitialState() {
        enforceInterface(this);
        return options.withProps ? this.constructor.calculateState(null, this.props) : this.constructor.calculateState(null, undefined);
      },
      componentWillMount: function componentWillMount() {
        var _this = this;
  
        // This tracks when any store has changed and we may need to update.
        var changed = false;
  
        var setChanged = function setChanged() {
          changed = true;
        }; // This adds subscriptions to stores. When a store changes all we do is
        // set changed to true.
  
  
        this._fluxMixinSubscriptions = stores.map(function (store) {
          return store.addListener(setChanged);
        }); // This callback is called after the dispatch of the relevant stores. If
        // any have reported a change we update the state, then reset changed.
  
        var callback = function callback() {
          if (changed) {
            _this.setState(function (prevState) {
              return options.withProps ? _this.constructor.calculateState(prevState, _this.props) : _this.constructor.calculateState(prevState, undefined);
            });
          }
  
          changed = false;
        };
  
        this._fluxMixinStoreGroup = new FluxStoreGroup(stores, callback);
      },
      componentWillUnmount: function componentWillUnmount() {
        this._fluxMixinStoreGroup.release();
  
        var _iterator = _createForOfIteratorHelper(this._fluxMixinSubscriptions),
            _step;
  
        try {
          for (_iterator.s(); !(_step = _iterator.n()).done;) {
            var subscription = _step.value;
            subscription.remove();
          }
        } catch (err) {
          _iterator.e(err);
        } finally {
          _iterator.f();
        }
  
        this._fluxMixinSubscriptions = [];
      }
    };
  }
  
  function enforceInterface(o) {
    !o.constructor.calculateState ? process.env.NODE_ENV !== "production" ? invariant(false, 'Components that use FluxMixinLegacy must implement ' + '`calculateState()` on the statics object') : invariant(false) : void 0;
  }
  
  module.exports = FluxMixinLegacy;