StrictMode in React is a development tool that helps in identifying potential problems in an application. It does not render any visible UI but activates additional checks and warnings for its descendants. The use of StrictMode is particularly beneficial during the development phase of a React application for several reasons:
Identifying Unsafe Lifecycles: It helps detect components that use unsafe lifecycle methods, which are not recommended for use in asynchronous applications[2][6].
Warning About Legacy String Ref API Usage: It warns developers about the usage of the legacy string ref API, encouraging the use of the callback pattern or the createRef API instead[2][6].
Warning About Deprecated findDOMNode Usage: It provides warnings about the use of findDOMNode, which is considered a legacy feature and recommends using ref callbacks or React.createRef()[2][6].
Detecting Unexpected Side Effects: StrictMode helps in detecting unexpected side effects by rendering components twice in development mode, which can reveal problems with mutation effects that are not properly cleaned up[2][6].
Detecting Legacy Context API: It warns about the use of the old context API, which is deprecated in favor of the new context API[6].
Ensuring Reusable State: It ensures that state is properly initialized and cleaned up, which can prevent memory leaks and other state-related bugs[6].
Preparing for Future Upgrades: Using StrictMode can make it easier to adopt future features of React, such as concurrent rendering, by ensuring that your code does not rely on deprecated patterns[3][6].
Improving Code Resilience: With the introduction of React 18, StrictMode has been enhanced to include automatic remounting of components in development mode to simulate user behavior such as navigating away from a screen and back, which helps en...
