Strict mode

Strict mode in the docs

StrictMode is a tool for highlighting potential problems in an application.

Like Fragment, StrictMode does not render any visible UI. It activates additional checks and warnings for its descendants.

Strict mode checks are run in development mode only; they do not impact the production build.

Example of applying strict mode in the main section:

import React from 'react';

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