48 lines
1.8 KiB
JavaScript
48 lines
1.8 KiB
JavaScript
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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; };
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import compose from './compose';
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/**
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* Creates a store enhancer that applies middleware to the dispatch method
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* of the Redux store. This is handy for a variety of tasks, such as expressing
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* asynchronous actions in a concise manner, or logging every action payload.
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*
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* See `redux-thunk` package as an example of the Redux middleware.
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*
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* Because middleware is potentially asynchronous, this should be the first
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* store enhancer in the composition chain.
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*
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* Note that each middleware will be given the `dispatch` and `getState` functions
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* as named arguments.
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*
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* @param {...Function} middlewares The middleware chain to be applied.
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* @returns {Function} A store enhancer applying the middleware.
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*/
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export default function applyMiddleware() {
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for (var _len = arguments.length, middlewares = Array(_len), _key = 0; _key < _len; _key++) {
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middlewares[_key] = arguments[_key];
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}
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return function (createStore) {
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return function (reducer, preloadedState, enhancer) {
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var store = createStore(reducer, preloadedState, enhancer);
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var _dispatch = store.dispatch;
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var chain = [];
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var middlewareAPI = {
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getState: store.getState,
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dispatch: function dispatch(action) {
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return _dispatch(action);
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}
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};
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chain = middlewares.map(function (middleware) {
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return middleware(middlewareAPI);
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});
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_dispatch = compose.apply(undefined, chain)(store.dispatch);
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return _extends({}, store, {
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dispatch: _dispatch
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});
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};
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};
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}
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