text: import './polyfills';
  import React from 'react';
  import ReactDOM from 'react-dom';
  import App from './containers/App';
  import registerServiceWorker from './registerServiceWorker';
  import { rootId } from './constants';
  
  const root = document.getElementById(rootId);
  
  if (root !== null) {
    ReactDOM.render(<App />, root);
    registerServiceWorker();
  } else {
    console.error('React root element is not present');
  }
  