redux-webpack-es6-boilerplate/src/client/assets/javascripts/app/store/configureStore.production.js

A starter project for modern React apps with Redux

import { createStore, applyMiddleware, compose } from 'redux';
import promiseMiddleware from 'redux-promise';

import rootReducer from '../reducer';

const enhancer = compose(
  applyMiddleware(promiseMiddleware)
)(createStore);

export default function configureStore(initialState) {
  return enhancer(rootReducer, initialState);
}