Understanding React StrictMode and Its Usage

React StrictMode is a powerful tool that allows you to enable a range of checks performed by React, providing valuable warnings and insights. By utilizing the built-in component React.StrictMode, you can easily enable these checks within your React application.

To implement React StrictMode, one straightforward approach is to wrap your entire App component with <React.StrictMode></React.StrictMode> in the index.js file. Here’s an example:

import React from 'react';
import ReactDOM from 'react-dom';

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

Alternatively, you can wrap specific components within the StrictMode. Here’s an example of wrapping the Hello component:

import React from 'react';

class Hello extends React.Component {
  render() {
    return (
      <div>
        <React.StrictMode>
          ...
        </React.StrictMode>
      </div>
    );
  }
}

React StrictMode serves as an excellent automated tool for checking best practices, identifying potential problems, and highlighting deprecations in your codebase. Although it may not catch every issue, it offers a range of useful checks that can assist you in resolving any low-hanging fruit.

Introduced in March 2018 with React 16.3, React StrictMode has no impact on production, allowing you to keep it in your codebase without affecting the end users. When used in development, it provides informative warnings in the browser’s JavaScript console.