shields/pages/index.js

import React from 'react'
import { HashRouter, StaticRouter, Route } from 'react-router-dom'
import ExamplesPage from '../frontend/components/examples-page'

export default class Router extends React.Component {
  render() {
    const router = (
      <div>
        <Route path="/" exact component={ExamplesPage} />
        <Route path="/examples/:id" component={ExamplesPage} />
      </div>
    )

    if (typeof window !== 'undefined') {
      // browser
      return <HashRouter>{router}</HashRouter>
    } else {
      // server-side rendering
      const context = {}
      return <StaticRouter context={context}>{router}</StaticRouter>
    }
  }
}