redux

[ynchuan]

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

  function symbolObservablePonyfill(root) {
    var result;
    var Symbol = root.Symbol;

    if (typeof Symbol === 'function') {
      if (Symbol.observable) {
        result = Symbol.observable;
      } else {
        result = Symbol('observable');
        Symbol.observable = result;
      }
    } else {
      result = '@@observable';
    }

    return result;
  }

  /* global window */

  var root;

  if (typeof self !== 'undefined') {
    root = self;
  } else if (typeof window !== 'undefined') {
    root = window;
  } else if (typeof global !== 'undefined') {
    root = global;
  } else if (typeof module !== 'undefined') {
    root = module;
  } else {
    root = Function('return this')();
  }

  var result = symbolObservablePonyfill(root);

  /**
   * These are private action types reserved by Redux.
   * For any unknown actions, you must return the current state.
   * If the current state is undefined, you must return the initial state.
   * Do not reference these action types directly in your code.
   */
  var randomString = function randomString() {
    return Math.random().toString(36).substring(7).split('').join('.');
  };

  var ActionTypes = {
    INIT: "@@redux/INIT" + randomString(),
    REPLACE: "@@redux/REPLACE" + randomString(),
    PROBE_UNKNOWN_ACTION: function PROBE_UNKNOWN_ACTION() {
      return "@@redux/PROBE_UNKNOWN_ACTION" + randomString();
    }
  };

  /**
   * @param {any} obj The object to inspect.
   * @returns {boolean} True if the argument appears to be a plain object.
   */
  function isPlainObject(obj) {
    if (typeof obj !== 'object' || obj === null) return false;
    var proto = obj;

    while (Object.getPrototypeOf(proto) !== null) {
      proto = Object.getPrototypeOf(proto);
    }

    return Object.getPrototypeOf(obj) === proto;
  }

  /**
   * Creates a Redux store that holds the state tree.
   * The only way to change the data in the store is to call `dispatch()` on it.
   *
   * There should only be a single store in your app. To specify how different
   * parts of the state tree respond to actions, you may combine several reducers
   * into a single reducer function by using `combineReducers`.
   *
   * @param {Function} reducer A function that returns the next state tree, given
   * the current state tree and the action to handle.
   *
   * @param {any} [preloadedState] The initial state. You may optionally specify it
   * to hydrate the state from the server in universal apps, or to restore a
   * previously serialized user session.
   * If you use `combineReducers` to produce the root reducer function, this must be
   * an object with the same shape as `combineReducers` keys.
   *
   * @param {Function} [enhancer] The store enhancer. You may optionally specify it
   * to enhance the store with third-party capabilities such as middleware,
   * time travel, persistence, etc. The only store enhancer that ships with Redux
   * is `applyMiddleware()`.
   *
   * @returns {Store} A Redux store that lets you read the state, dispatch actions
   * and subscribe to changes.
   */

  function createStore(reducer, preloadedState, enhancer) {
    var _ref2;

    if (typeof preloadedState === 'function' && typeof enhancer === 'function' || typeof enhancer === 'function' && typeof arguments[3] === 'function') {
      throw new Error('It looks like you are passing several store enhancers to ' + 'createStore(). This is not supported. Instead, compose them ' + 'together to a single function.');
    }

    if (typeof preloadedState === 'function' && typeof enhancer === 'undefined') {
      enhancer = preloadedState;
      preloadedState = undefined;
    }

    if (typeof enhancer !== 'undefined') {
      if (typeof enhancer !== 'function') {
        throw new Error('Expected the enhancer to be a function.');
      }

      return enhancer(createStore)(reducer, preloadedState);
    }

    if (typeof reducer !== 'function') {
      throw new Error('Expected the reducer to be a function.');
    }

    var currentReducer = reducer;
    var currentState = preloadedState;
    var currentListeners = [];
    var nextListeners = currentListeners;
    var isDispatching = false;
    /**
     * This makes a shallow copy of currentListeners so we can use
     * nextListeners as a temporary list while dispatching.
     *
     * This prevents any bugs around consumers calling
     * subscribe/unsubscribe in the middle of a dispatch.
     */

    function ensureCanMutateNextListeners() {
      if (nextListeners === currentListeners) {
        nextListeners = currentListeners.slice();
      }
    }
    /**
     * Reads the state tree managed by the store.
     *
     * @returns {any} The current state tree of your application.
     */

    function getState() {
      if (isDispatching) {
        throw new Error('You may not call store.getState() while the reducer is executing. ' + 'The reducer has already received the state as an argument. ' + 'Pass it down from the top reducer instead of reading it from the store.');
      }

      return currentState;
    }
    /**
     * Adds a change listener. It will be called any time an action is dispatched,
     * and some part of the state tree may potentially have changed. You may then
     * call `getState()` to read the current state tree inside the callback.
     *
     * You may call `dispatch()` from a change listener, with the following
     * caveats:
     *
     * 1. The subscriptions are snapshotted just before every `dispatch()` call.
     * If you subscribe or unsubscribe while the listeners are being invoked, this
     * will not have any effect on the `dispatch()` that is currently in progress.
     * However, the next `dispatch()` call, whether nested or not, will use a more
     * recent snapshot of the subscription list.
     *
     * 2. The listener should not expect to see all state changes, as the state
     * might have been updated multiple times during a nested `dispatch()` before
     * the listener is called. It is, however, guaranteed that all subscribers
     * registered before the `dispatch()` started will be called with the latest
     * state by the time it exits.
     *
     * @param {Function} listener A callback to be invoked on every dispatch.
     * @returns {Function} A function to remove this change listener.
     */

    function subscribe(listener) {
      if (typeof listener !== 'function') {
        throw new Error('Expected the listener to be a function.');
      }

      if (isDispatching) {
        throw new Error('You may not call store.subscribe() while the reducer is executing. ' + 'If you would like to be notified after the store has been updated, subscribe from a ' + 'component and invoke store.getState() in the callback to access the latest state. ' + 'See https://redux.js.org/api-reference/store#subscribelistener for more details.');
      }

      var isSubscribed = true;
      ensureCanMutateNextListeners();
      nextListeners.push(listener);
      return function unsubscribe() {
        if (!isSubscribed) {
          return;
        }

        if (isDispatching) {
          throw new Error('You may not unsubscribe from a store listener while the reducer is executing. ' + 'See https://redux.js.org/api-reference/store#subscribelistener for more details.');
        }

        isSubscribed = false;
        ensureCanMutateNextListeners();
        var index = nextListeners.indexOf(listener);
        nextListeners.splice(index, 1);
        currentListeners = null;
      };
    }
    /**
     * Dispatches an action. It is the only way to trigger a state change.
     *
     * The `reducer` function, used to create the store, will be called with the
     * current state tree and the given `action`. Its return value will
     * be considered the **next** state of the tree, and the change listeners
     * will be notified.
     *
     * The base implementation only supports plain object actions. If you want to
     * dispatch a Promise, an Observable, a thunk, or something else, you need to
     * wrap your store creating function into the corresponding middleware. For
     * example, see the documentation for the `redux-thunk` package. Even the
     * middleware will eventually dispatch plain object actions using this method.
     *
     * @param {Object} action A plain object representing “what changed”. It is
     * a good idea to keep actions serializable so you can record and replay user
     * sessions, or use the time travelling `redux-devtools`. An action must have
     * a `type` property which may not be `undefined`. It is a good idea to use
     * string constants for action types.
     *
     * @returns {Object} For convenience, the same action object you dispatched.
     *
     * Note that, if you use a custom middleware, it may wrap `dispatch()` to
     * return something else (for example, a Promise you can await).
     */

    function dispatch(action) {
      if (!isPlainObject(action)) {
        throw new Error('Actions must be plain objects. ' + 'Use custom middleware for async actions.');
      }

      if (typeof action.type === 'undefined') {
        throw new Error('Actions may not have an undefined "type" property. ' + 'Have you misspelled a constant?');
      }

      if (isDispatching) {
        throw new Error('Reducers may not dispatch actions.');
      }

      try {
        isDispatching = true;
        currentState = currentReducer(currentState, action);
      } finally {
        isDispatching = false;
      }

      var listeners = currentListeners = nextListeners;

      for (var i = 0; i < listeners.length; i++) {
        var listener = listeners[i];
        listener();
      }

      return action;
    }
    /**
     * Replaces the reducer currently used by the store to calculate the state.
     *
     * You might need this if your app implements code splitting and you want to
     * load some of the reducers dynamically. You might also need this if you
     * implement a hot reloading mechanism for Redux.
     *
     * @param {Function} nextReducer The reducer for the store to use instead.
     * @returns {void}
     */

    function replaceReducer(nextReducer) {
      if (typeof nextReducer !== 'function') {
        throw new Error('Expected the nextReducer to be a function.');
      }

      currentReducer = nextReducer; // This action has a similiar effect to ActionTypes.INIT.
      // Any reducers that existed in both the new and old rootReducer
      // will receive the previous state. This effectively populates
      // the new state tree with any relevant data from the old one.

      dispatch({
        type: ActionTypes.REPLACE
      });
    }
    /**
     * Interoperability point for observable/reactive libraries.
     * @returns {observable} A minimal observable of state changes.
     * For more information, see the observable proposal:
     * https://github.com/tc39/proposal-observable
     */

    function observable() {
      var _ref;

      var outerSubscribe = subscribe;
      return _ref = {
        /**
         * The minimal observable subscription method.
         * @param {Object} observer Any object that can be used as an observer.
         * The observer object should have a `next` method.
         * @returns {subscription} An object with an `unsubscribe` method that can
         * be used to unsubscribe the observable from the store, and prevent further
         * emission of values from the observable.
         */
        subscribe: function subscribe(observer) {
          if (typeof observer !== 'object' || observer === null) {
            throw new TypeError('Expected the observer to be an object.');
          }

          function observeState() {
            if (observer.next) {
              observer.next(getState());
            }
          }

          observeState();
          var unsubscribe = outerSubscribe(observeState);
          return {
            unsubscribe: unsubscribe
          };
        }
      }, _ref[result] = function () {
        return this;
      }, _ref;
    } // When a store is created, an "INIT" action is dispatched so that every
    // reducer returns their initial state. This effectively populates
    // the initial state tree.

    dispatch({
      type: ActionTypes.INIT
    });
    return _ref2 = {
      dispatch: dispatch,
      subscribe: subscribe,
      getState: getState,
      replaceReducer: replaceReducer
    }, _ref2[result] = observable, _ref2;
  }

  /**
   * Prints a warning in the console if it exists.
   *
   * @param {String} message The warning message.
   * @returns {void}
   */
  function warning(message) {
    /* eslint-disable no-console */
    if (typeof console !== 'undefined' && typeof console.error === 'function') {
      console.error(message);
    }
    /* eslint-enable no-console */

    try {
      // This error was thrown as a convenience so that if you enable
      // "break on all exceptions" in your console,
      // it would pause the execution at this line.
      throw new Error(message);
    } catch (e) { } // eslint-disable-line no-empty

  }

  function getUndefinedStateErrorMessage(key, action) {
    var actionType = action && action.type;
    var actionDescription = actionType && "action \"" + String(actionType) + "\"" || 'an action';
    return "Given " + actionDescription + ", reducer \"" + key + "\" returned undefined. " + "To ignore an action, you must explicitly return the previous state. " + "If you want this reducer to hold no value, you can return null instead of undefined.";
  }

  function getUnexpectedStateShapeWarningMessage(inputState, reducers, action, unexpectedKeyCache) {
    var reducerKeys = Object.keys(reducers);
    var argumentName = action && action.type === ActionTypes.INIT ? 'preloadedState argument passed to createStore' : 'previous state received by the reducer';

    if (reducerKeys.length === 0) {
      return 'Store does not have a valid reducer. Make sure the argument passed ' + 'to combineReducers is an object whose values are reducers.';
    }

    if (!isPlainObject(inputState)) {
      return "The " + argumentName + " has unexpected type of \"" + {}.toString.call(inputState).match(/\s([a-z|A-Z]+)/)[1] + "\". Expected argument to be an object with the following " + ("keys: \"" + reducerKeys.join('", "') + "\"");
    }

    var unexpectedKeys = Object.keys(inputState).filter(function (key) {
      return !reducers.hasOwnProperty(key) && !unexpectedKeyCache[key];
    });
    unexpectedKeys.forEach(function (key) {
      unexpectedKeyCache[key] = true;
    });
    if (action && action.type === ActionTypes.REPLACE) return;

    if (unexpectedKeys.length > 0) {
      return "Unexpected " + (unexpectedKeys.length > 1 ? 'keys' : 'key') + " " + ("\"" + unexpectedKeys.join('", "') + "\" found in " + argumentName + ". ") + "Expected to find one of the known reducer keys instead: " + ("\"" + reducerKeys.join('", "') + "\". Unexpected keys will be ignored.");
    }
  }

  function assertReducerShape(reducers) {
    Object.keys(reducers).forEach(function (key) {
      var reducer = reducers[key];
      var initialState = reducer(undefined, {
        type: ActionTypes.INIT
      });

      if (typeof initialState === 'undefined') {
        throw new Error("Reducer \"" + key + "\" returned undefined during initialization. " + "If the state passed to the reducer is undefined, you must " + "explicitly return the initial state. The initial state may " + "not be undefined. If you don't want to set a value for this reducer, " + "you can use null instead of undefined.");
      }

      if (typeof reducer(undefined, {
        type: ActionTypes.PROBE_UNKNOWN_ACTION()
      }) === 'undefined') {
        throw new Error("Reducer \"" + key + "\" returned undefined when probed with a random type. " + ("Don't try to handle " + ActionTypes.INIT + " or other actions in \"redux/*\" ") + "namespace. They are considered private. Instead, you must return the " + "current state for any unknown actions, unless it is undefined, " + "in which case you must return the initial state, regardless of the " + "action type. The initial state may not be undefined, but can be null.");
      }
    });
  }
  /**
   * Turns an object whose values are different reducer functions, into a single
   * reducer function. It will call every child reducer, and gather their results
   * into a single state object, whose keys correspond to the keys of the passed
   * reducer functions.
   *
   * @param {Object} reducers An object whose values correspond to different
   * reducer functions that need to be combined into one. One handy way to obtain
   * it is to use ES6 `import * as reducers` syntax. The reducers may never return
   * undefined for any action. Instead, they should return their initial state
   * if the state passed to them was undefined, and the current state for any
   * unrecognized action.
   *
   * @returns {Function} A reducer function that invokes every reducer inside the
   * passed object, and builds a state object with the same shape.
   */

  function combineReducers(reducers) {
    var reducerKeys = Object.keys(reducers);
    var finalReducers = {};

    for (var i = 0; i < reducerKeys.length; i++) {
      var key = reducerKeys[i];

      {
        if (typeof reducers[key] === 'undefined') {
          warning("No reducer provided for key \"" + key + "\"");
        }
      }

      if (typeof reducers[key] === 'function') {
        finalReducers[key] = reducers[key];
      }
    }

    var finalReducerKeys = Object.keys(finalReducers); // This is used to make sure we don't warn about the same
    // keys multiple times.

    var unexpectedKeyCache;

    {
      unexpectedKeyCache = {};
    }

    var shapeAssertionError;

    try {
      assertReducerShape(finalReducers);
    } catch (e) {
      shapeAssertionError = e;
    }

    return function combination(state, action) {
      if (state === void 0) {
        state = {};
      }

      if (shapeAssertionError) {
        throw shapeAssertionError;
      }

      {
        var warningMessage = getUnexpectedStateShapeWarningMessage(state, finalReducers, action, unexpectedKeyCache);

        if (warningMessage) {
          warning(warningMessage);
        }
      }

      var hasChanged = false;
      var nextState = {};

      for (var _i = 0; _i < finalReducerKeys.length; _i++) {
        var _key = finalReducerKeys[_i];
        var reducer = finalReducers[_key];
        var previousStateForKey = state[_key];
        var nextStateForKey = reducer(previousStateForKey, action);

        if (typeof nextStateForKey === 'undefined') {
          var errorMessage = getUndefinedStateErrorMessage(_key, action);
          throw new Error(errorMessage);
        }

        nextState[_key] = nextStateForKey;
        hasChanged = hasChanged || nextStateForKey !== previousStateForKey;
      }

      hasChanged = hasChanged || finalReducerKeys.length !== Object.keys(state).length;
      return hasChanged ? nextState : state;
    };
  }

  function bindActionCreator(actionCreator, dispatch) {
    return function () {
      return dispatch(actionCreator.apply(this, arguments));
    };
  }
  /**
   * Turns an object whose values are action creators, into an object with the
   * same keys, but with every function wrapped into a `dispatch` call so they
   * may be invoked directly. This is just a convenience method, as you can call
   * `store.dispatch(MyActionCreators.doSomething())` yourself just fine.
   *
   * For convenience, you can also pass an action creator as the first argument,
   * and get a dispatch wrapped function in return.
   *
   * @param {Function|Object} actionCreators An object whose values are action
   * creator functions. One handy way to obtain it is to use ES6 `import * as`
   * syntax. You may also pass a single function.
   *
   * @param {Function} dispatch The `dispatch` function available on your Redux
   * store.
   *
   * @returns {Function|Object} The object mimicking the original object, but with
   * every action creator wrapped into the `dispatch` call. If you passed a
   * function as `actionCreators`, the return value will also be a single
   * function.
   */

  function bindActionCreators(actionCreators, dispatch) {
    if (typeof actionCreators === 'function') {
      return bindActionCreator(actionCreators, dispatch);
    }

    if (typeof actionCreators !== 'object' || actionCreators === null) {
      throw new Error("bindActionCreators expected an object or a function, instead received " + (actionCreators === null ? 'null' : typeof actionCreators) + ". " + "Did you write \"import ActionCreators from\" instead of \"import * as ActionCreators from\"?");
    }

    var boundActionCreators = {};

    for (var key in actionCreators) {
      var actionCreator = actionCreators[key];

      if (typeof actionCreator === 'function') {
        boundActionCreators[key] = bindActionCreator(actionCreator, dispatch);
      }
    }

    return boundActionCreators;
  }

  function _defineProperty(obj, key, value) {
    if (key in obj) {
      Object.defineProperty(obj, key, {
        value: value,
        enumerable: true,
        configurable: true,
        writable: true
      });
    } else {
      obj[key] = value;
    }

    return obj;
  }

  function ownKeys(object, enumerableOnly) {
    var keys = Object.keys(object);

    if (Object.getOwnPropertySymbols) {
      keys.push.apply(keys, Object.getOwnPropertySymbols(object));
    }

    if (enumerableOnly) keys = keys.filter(function (sym) {
      return Object.getOwnPropertyDescriptor(object, sym).enumerable;
    });
    return keys;
  }

  function _objectSpread2(target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i] != null ? arguments[i] : {};

      if (i % 2) {
        ownKeys(source, true).forEach(function (key) {
          _defineProperty(target, key, source[key]);
        });
      } else if (Object.getOwnPropertyDescriptors) {
        Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
      } else {
        ownKeys(source).forEach(function (key) {
          Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
        });
      }
    }

    return target;
  }

  /**
   * Composes single-argument functions from right to left. The rightmost
   * function can take multiple arguments as it provides the signature for
   * the resulting composite function.
   *
   * @param {...Function} funcs The functions to compose.
   * @returns {Function} A function obtained by composing the argument functions
   * from right to left. For example, compose(f, g, h) is identical to doing
   * (...args) => f(g(h(...args))).
   */
  function compose() {
    for (var _len = arguments.length, funcs = new Array(_len), _key = 0; _key < _len; _key++) {
      funcs[_key] = arguments[_key];
    }

    if (funcs.length === 0) {
      return function (arg) {
        return arg;
      };
    }

    if (funcs.length === 1) {
      return funcs[0];
    }

    return funcs.reduce(function (a, b) {
      return function () {
        return a(b.apply(void 0, arguments));
      };
    });
  }

  /**
   * Creates a store enhancer that applies middleware to the dispatch method
   * of the Redux store. This is handy for a variety of tasks, such as expressing
   * asynchronous actions in a concise manner, or logging every action payload.
   *
   * See `redux-thunk` package as an example of the Redux middleware.
   *
   * Because middleware is potentially asynchronous, this should be the first
   * store enhancer in the composition chain.
   *
   * Note that each middleware will be given the `dispatch` and `getState` functions
   * as named arguments.
   *
   * @param {...Function} middlewares The middleware chain to be applied.
   * @returns {Function} A store enhancer applying the middleware.
   */

  function applyMiddleware() {
    for (var _len = arguments.length, middlewares = new Array(_len), _key = 0; _key < _len; _key++) {
      middlewares[_key] = arguments[_key];
    }

    return function (createStore) {
      return function () {
        var store = createStore.apply(void 0, arguments);

        var _dispatch = function dispatch() {
          throw new Error('Dispatching while constructing your middleware is not allowed. ' + 'Other middleware would not be applied to this dispatch.');
        };

        var middlewareAPI = {
          getState: store.getState,
          dispatch: function dispatch() {
            return _dispatch.apply(void 0, arguments);
          }
        };
        var chain = middlewares.map(function (middleware) {
          return middleware(middlewareAPI);
        });
        _dispatch = compose.apply(void 0, chain)(store.dispatch);
        return _objectSpread2({}, store, {
          dispatch: _dispatch
        });
      };
    };
  }

  /*
   * This is a dummy function to check if the function name has been altered by minification.
   * If the function has been minified and NODE_ENV !== 'production', warn the user.
   */

  function isCrushed() { }

  if (typeof isCrushed.name === 'string' && isCrushed.name !== 'isCrushed') {
    warning('You are currently using minified code outside of NODE_ENV === "production". ' + 'This means that you are running a slower development build of Redux. ' + 'You can use loose-envify (https://github.com/zertosh/loose-envify) for browserify ' + 'or setting mode to production in webpack (https://webpack.js.org/concepts/mode/) ' + 'to ensure you have the correct code for your production build.');
  }

  exports.__DO_NOT_USE__ActionTypes = ActionTypes;
  exports.applyMiddleware = applyMiddleware;
  exports.bindActionCreators = bindActionCreators;
  exports.combineReducers = combineReducers;
  exports.compose = compose;
  exports.createStore = createStore;

  Object.defineProperty(exports, '__esModule', { value: true });

}));

[ynchuan]

import { createStore } from 'redux'

/**
 * This is a reducer, a pure function with (state, action) => state signature.
 * It describes how an action transforms the state into the next state.
 *
 * The shape of the state is up to you: it can be a primitive, an array, an object,
 * or even an Immutable.js data structure. The only important part is that you should
 * not mutate the state object, but return a new object if the state changes.
 *
 * In this example, we use a `switch` statement and strings, but you can use a helper that
 * follows a different convention (such as function maps) if it makes sense for your
 * project.
 */
function counter(state = 0, action) {
  switch (action.type) {
    case 'INCREMENT':
      return state + 1
    case 'DECREMENT':
      return state - 1
    default:
      return state
  }
}

// Create a Redux store holding the state of your app.
// Its API is { subscribe, dispatch, getState }.
let store = createStore(counter)

// You can use subscribe() to update the UI in response to state changes.
// Normally you'd use a view binding library (e.g. React Redux) rather than subscribe() directly.
// However it can also be handy to persist the current state in the localStorage.

store.subscribe(() => console.log(store.getState()))

// The only way to mutate the internal state is to dispatch an action.
// The actions can be serialized, logged or stored and later replayed.
store.dispatch({ type: 'INCREMENT' })
// 1
store.dispatch({ type: 'INCREMENT' })
// 2
store.dispatch({ type: 'DECREMENT' })
// 1

[ynchuan]

function createThunkMiddleware(extraArgument) {
  return ({ dispatch, getState }) => (next) => (action) => {
    if (typeof action === 'function') {
      return action(dispatch, getState, extraArgument);
    }

    return next(action);
  };
}

const thunk = createThunkMiddleware();
thunk.withExtraArgument = createThunkMiddleware;

export default thunk;

const store = createStore(rootReducer, applyMiddleware(thunk));

[ynchuan]

function* a(s) { var t = yield s + 1; return t }

[ynchuan]