pwa-helpers/lazy-reducer-enhancer.js

/**
@license
Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/
/**
  A Redux store enhancer that lets you lazy-install reducers after the store
  has booted up. Use this if your application lazy-loads routes that are connected
  to a Redux store.

  Example:

      import { combineReducers } from 'redux';
      import { lazyReducerEnhancer } from 'pwa-helpers/lazy-reducer-enhancer.js';
      import someReducer from './reducers/someReducer.js';

      export const store = createStore(
        (state, action) => state,
        compose(lazyReducerEnhancer(combineReducers))
      );

  Then, in your page/element, you can lazy load a specific reducer with:

      store.addReducers({
        someReducer
      });
*/
export const lazyReducerEnhancer = (combineReducers) => {
    const enhancer = (nextCreator) => {
        return (origReducer, preloadedState) => {
            let lazyReducers = {};
            const nextStore = nextCreator(origReducer, preloadedState);
            return Object.assign({}, nextStore, { addReducers(newReducers) {
                    const combinedReducerMap = Object.assign({}, lazyReducers, newReducers);
                    this.replaceReducer(combineReducers(lazyReducers = combinedReducerMap));
                } });
        };
    };
    return enhancer;
};
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