import { StrictMode } from 'react' is a statement used in React applications to import the StrictMode component from the React library.

What is StrictMode?

StrictMode is a wrapper component in React that helps developers identify potential problems in an application. It doesn’t render anything to the UI, but it activates additional checks and warnings for its children during development. These checks help ensure that your code adheres to best practices and can make it easier to spot side effects, deprecated methods, and unsafe life cycles.

Key Features of StrictMode:

• Identifies unsafe lifecycle methods: It warns you about deprecated lifecycle methods like componentWillMount, componentWillUpdate, etc.
• Checks for usage of legacy string ref API.
• Warns about side effects in functions like those that run multiple times (such as during rendering).
• Strict mode checks run only in development mode and do not impact production builds.

Example Usage:

javascript