createstore.js

import weatherApp from '../reducers/'
import { createStore, applyMiddleware } from 'redux'
import thunkMiddleware from 'redux-thunk'
import createLogger from 'redux-logger'

const loggerMiddleware = createLogger()

const createStoreWithMiddleware = applyMiddleware(
  thunkMiddleware, // lets us dispatch() functions
  loggerMiddleware // neat middleware that logs actions
)(createStore)

export default function configureStore(initialState) {
  return createStoreWithMiddleware(weatherApp, initialState)
}