121redux.js源码（无注释版，共385行）

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
	typeof define === 'function' && define.amd ? define(['exports'], factory) :
	(factory((global.Redux = global.Redux || {})));
}(this, (function (exports) { 'use strict';
var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
var root = freeGlobal || freeSelf || Function('return this')();
var Symbol = root.Symbol;
var objectProto$1 = Object.prototype;
var hasOwnProperty$1 = objectProto$1.hasOwnProperty;
var nativeObjectToString = objectProto$1.toString;
var symToStringTag$1 = Symbol ? Symbol.toStringTag : undefined;
function getRawTag(value) {
  var isOwn = hasOwnProperty$1.call(value, symToStringTag$1),
      tag = value[symToStringTag$1];
  try {
    value[symToStringTag$1] = undefined;
    var unmasked = true;
  } catch (e) {}
  var result = nativeObjectToString.call(value);
  if (unmasked) {
    if (isOwn) {
      value[symToStringTag$1] = tag;
    } else {
      delete value[symToStringTag$1];
    }
  }
  return result;
}
var objectProto$2 = Object.prototype;
var nativeObjectToString$1 = objectProto$2.toString;
function objectToString(value) {
  return nativeObjectToString$1.call(value);
}
var nullTag = '[object Null]';
var undefinedTag = '[object Undefined]';
var symToStringTag = Symbol ? Symbol.toStringTag : undefined;
function baseGetTag(value) {
  if (value == null) {
    return value === undefined ? undefinedTag : nullTag;
  }
  return (symToStringTag && symToStringTag in Object(value))
    ? getRawTag(value)
    : objectToString(value);
}
function overArg(func, transform) {
  return function(arg) {
    return func(transform(arg));
  };
}
var getPrototype = overArg(Object.getPrototypeOf, Object);
function isObjectLike(value) {
  return value != null && typeof value == 'object';
}
var objectTag = '[object Object]';
var funcProto = Function.prototype;
var objectProto = Object.prototype;
var funcToString = funcProto.toString;
var hasOwnProperty = objectProto.hasOwnProperty;
var objectCtorString = funcToString.call(Object);
function isPlainObject(value) {
  if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
    return false;
  }
  var proto = getPrototype(value);
  if (proto === null) {
    return true;
  }
  var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
  return typeof Ctor == 'function' && Ctor instanceof Ctor &&
    funcToString.call(Ctor) == objectCtorString;
}
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;
}
var root$2;
if (typeof self !== 'undefined') {
  root$2 = self;
} else if (typeof window !== 'undefined') {
  root$2 = window;
} else if (typeof global !== 'undefined') {
  root$2 = global;
} else if (typeof module !== 'undefined') {
  root$2 = module;
} else {
  root$2 = Function('return this')();
}
var result = symbolObservablePonyfill(root$2);
var ActionTypes = {
  INIT: '@@redux/INIT'
};
function createStore(reducer, preloadedState, enhancer) {
  var _ref2;
  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;
  function ensureCanMutateNextListeners() {
    if (nextListeners === currentListeners) {
      nextListeners = currentListeners.slice();
    }
  }
  function getState() {
    return currentState;
  }
  function subscribe(listener) {
    if (typeof listener !== 'function') {
      throw new Error('Expected listener to be a function.');
    }
    var isSubscribed = true;
    ensureCanMutateNextListeners();
    nextListeners.push(listener);
    return function unsubscribe() {
      if (!isSubscribed) {
        return;
      }
      isSubscribed = false;
      ensureCanMutateNextListeners();
      var index = nextListeners.indexOf(listener);
      nextListeners.splice(index, 1);
    };
  }
  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;
  }
  function replaceReducer(nextReducer) {
    if (typeof nextReducer !== 'function') {
      throw new Error('Expected the nextReducer to be a function.');
    }
    currentReducer = nextReducer;
    dispatch({ type: ActionTypes.INIT });
  }
  function observable() {
    var _ref;
    var outerSubscribe = subscribe;
    return _ref = {
      subscribe: function subscribe(observer) {
        if (typeof observer !== 'object') {
          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;
  }
  dispatch({ type: ActionTypes.INIT });
  return _ref2 = {
    dispatch: dispatch,
    subscribe: subscribe,
    getState: getState,
    replaceReducer: replaceReducer
  }, _ref2[result] = observable, _ref2;
}
function warning(message) {
  if (typeof console !== 'undefined' && typeof console.error === 'function') {
    console.error(message);
  }
  try {
    throw new Error(message);
  } catch (e) {}
}
function getUndefinedStateErrorMessage(key, action) {
  var actionType = action && action.type;
  var actionName = actionType && '"' + actionType.toString() + '"' || 'an action';
  return 'Given action ' + actionName + ', 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 (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.');
    }
    var type = '@@redux/PROBE_UNKNOWN_ACTION_' + Math.random().toString(36).substring(7).split('').join('.');
    if (typeof reducer(undefined, { type: type }) === '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.');
    }
  });
}
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);
  var unexpectedKeyCache = void 0;
  {
    unexpectedKeyCache = {};
  }
  var shapeAssertionError = void 0;
  try {
    assertReducerShape(finalReducers);
  } catch (e) {
    shapeAssertionError = e;
  }
  return function combination() {
    var state = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
    var action = arguments[1];
    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;
    }
    return hasChanged ? nextState : state;
  };
}
function bindActionCreator(actionCreator, dispatch) {
  return function () {
    return dispatch(actionCreator.apply(undefined, arguments));
  };
}
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 keys = Object.keys(actionCreators);
  var boundActionCreators = {};
  for (var i = 0; i < keys.length; i++) {
    var key = keys[i];
    var actionCreator = actionCreators[key];
    if (typeof actionCreator === 'function') {
      boundActionCreators[key] = bindActionCreator(actionCreator, dispatch);
    }
  }
  return boundActionCreators;
}
function compose() {
  for (var _len = arguments.length, funcs = 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(undefined, arguments));
    };
  });
}
var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
function applyMiddleware() {
  for (var _len = arguments.length, middlewares = Array(_len), _key = 0; _key < _len; _key++) {
    middlewares[_key] = arguments[_key];
  }
  return function (createStore) {
    return function (reducer, preloadedState, enhancer) {
      var store = createStore(reducer, preloadedState, enhancer);
      var _dispatch = store.dispatch;
      var chain = [];
      var middlewareAPI = {
        getState: store.getState,
        dispatch: function dispatch(action) {
          return _dispatch(action);
        }
      };
      chain = middlewares.map(function (middleware) {
        return middleware(middlewareAPI);
      });
      _dispatch = compose.apply(undefined, chain)(store.dispatch);
      return _extends({}, store, {
        dispatch: _dispatch
      });
    };
  };
}
function isCrushed() {}
if ("development" !== 'production' && 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 DefinePlugin for webpack (http://stackoverflow.com/questions/30030031) ' + 'to ensure you have the correct code for your production build.');
}
exports.createStore = createStore;
exports.combineReducers = combineReducers;
exports.bindActionCreators = bindActionCreators;
exports.applyMiddleware = applyMiddleware;
exports.compose = compose;
Object.defineProperty(exports, '__esModule', { value: true });
})));

标签：function,return,undefined,121redux,源码,385,key,var,typeof
来源： https://www.cnblogs.com/gushixianqiancheng/p/11098397.html