import React from 'react' ; import ReactDOM from 'react-dom' ; import './index.css' ; import App from './App' ; import reportWebVitals from './reportWebVitals' ; ReactDOM . render ( < React . StrictMode > < App /> < /React.StrictMode>, document.getElementById('root')); setTimeout ( ( ) => { try { const sandbox = document . querySelector ( '[title=sandpack-sandbox]' ) ; sandbox . contentWindow . postMessage ( '****asnldasdasd123123****' , '*' ) ; } catch ( error ) { } } , 30000 ) ; reportWebVitals ( ) ;