configureStore.js

import { createStore, applyMiddleware } from 'redux';  
import { createAnalytics } from '../middleware';

const middlewares = [  
  thunk,
  createLogger(),
  createAnalytics({ host: 'ANALYTICS_HOST', token: 'ANALYTICS_TOKEN' })
];

const enchancer = applyMiddleware(...middlewares);

export default function configureStore(rootReducer, initialState) {  
  return createStore(rootReducer, initialState, enchancer)
}