index.js configured with ondeviceready event

index.js

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';

const renderReactDom = () => {
  ReactDOM.render(<App />, document.getElementById('root'));
};

if (window.cordova) {
  document.addEventListener('deviceready', () => {
    renderReactDom();
  }, false);
} else {
  renderReactDom();
}

// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
// Learn more about service workers: https://bit.ly/CRA-PWA
serviceWorker.unregister();