StrictMode Component - anastasiamexa/react-complete-guide-course-resources GitHub Wiki

The StrictMode component in React, as imported from 'react', is a development mode tool that helps identify common problems in the application. It enables additional checks and warnings for potential issues in your code. It is not meant for use in production but rather as a development aid to catch and address potential problems early.

To use Strict Mode in a React application, you can wrap your root component with <StrictMode>:

import { StrictMode } from 'react';
import ReactDOM from 'react-dom/client';

import App from './App.jsx';
import './index.css';

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

By wrapping your <App /> component with <StrictMode>, React will perform extra checks to help you identify and address potential problems early in the development process. This is a valuable tool for ensuring your application adheres to best practices and is more robust. Remember to disable StrictMode in production since it is intended for development use only.

When Strict Mode is enabled, React will perform additional checks and log warnings to the console for various issues such as:

1. Identifying unsafe lifecycle methods
2. Detecting unexpected side effects in render methods
3. Warning about legacy string ref usage
4. Warning about deprecated findDOMNode usage
5. Detecting the usage of some deprecated methods

Keep in mind that these additional checks can sometimes result in warnings for code that is technically correct and safe, but it helps catch potential issues early in the development process.