reduxDevTool 配置

import { createStore, compose, applyMiddleware } from ‘redux‘
import reducer from ‘./reducer‘
import thunk from ‘redux-thunk‘

const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ ?
    window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__({}) : compose

const enhancer = composeEnhancers(applyMiddleware(thunk))

const store = createStore(reducer,
    enhancer
)

export default store