ReactDOM.render( <React.StrictMode> <App /> </React.StrictMode>, document.getElementById('root') ); code example

Example: react strict mode

import React from 'react';

function ExampleApplication() {
  return (
    <div>
      <Header />
      <React.StrictMode>        <div>
          <ComponentOne />
          <ComponentTwo />
        </div>
      </React.StrictMode>      <Footer />
    </div>
  );
}