hot reload

hotreload.js

ReactDOM.render(
  <App />,
  rootEl
)

if (module.hot) {
  module.hot.accept('./App', () => {
    const NextApp = require('./App').default
    ReactDOM.render(
      <NextApp />,
      rootEl
    )
  })
}

const configureStore = () => {
  const store = createStore()
  
  if (module.hot) { 
    module.hot.accept(() => { 
      const nextRootReducer = require('../reducers/index').default 
      store.replaceReducer(nextRootReducer) 
    }) 
  }
  
  return store
}