app/assets/javascripts/components/store/configureStore.js
import { createStore, applyMiddleware, combineReducers } from 'redux';
import thunk from 'redux-thunk';
import rootReducer from '../reducers/index.js';
const createStoreWithMiddleware = applyMiddleware(
thunk
)(createStore);
export default function configureStore(initialState) {
return createStoreWithMiddleware(rootReducer, initialState);
}