const App = () => {
  const [loading, setLoading] = React.useState(true);
  React.useEffect(() => {
    const interval = setInterval(() => {
      setLoading(false);
    }, 3000);
    return () => clearInterval(interval);
  }, []);
  return (
    
{loading ? 
Loading
 : 
Counter
}
  );
}
ReactDOM.render(, document.getElementById("root"));