verdnatura-chat/app/lib/createStore.js

import { createStore, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';
import logger from 'redux-logger';
import rootReducer from '../reducers/rootReducer';

let middleware = [thunk];

if (__DEV__) {
	/* eslint-disable global-require */
	const reduxImmutableStateInvariant = require('redux-immutable-state-invariant').default();
	middleware = [...middleware, reduxImmutableStateInvariant, logger];
} else {
	middleware = [...middleware];
}

export default createStore(
	rootReducer,
	undefined,
	applyMiddleware(...middleware)
);