text: import React from 'react';
  import { render } from 'react-dom';
  import { BrowserRouter as Router } from 'react-router-dom';
  import * as serviceWorker from './serviceWorker.js';
  import App from './components/App.js';
  import './styles/normalize.css';
  
  render(
      <Router>
          <App />
      </Router>,
      document.getElementById('root')
  );
  
  // Change to .unregister() or .register() to toggle PWA.
  serviceWorker.unregister();
  