app-client.js

// app-client.js
import React from 'react'
import { render } from 'react-dom'
import { Router } from 'react-router'
import createBrowserHistory from 'history/lib/createBrowserHistory'
const history = createBrowserHistory()
// Routes
import routes from './routes'

const Routes = (
  <Router history={history}>
    { routes }
  </Router>
)

const app = document.getElementById('app')
render(Routes, app)