Video: Everything You Need to Know About React 19

React 19 is the latest version of the React library, offering new features like React Actions, new hooks, and a React Compiler that auto-memoizes code, eliminating the need for useMemo and useCallback.

React 19 introduces better support for forms with features like the useFormStatus hook for managing pending states and the useActionState hook for handling form submissions.

No, it's not necessary to remove useMemo and useCallback. The React Compiler in React 19 handles auto-memoization, but existing code using these hooks can remain as is.

Yes, the React Compiler can be used with earlier versions of React through a plugin, allowing developers to benefit from auto-memoization without upgrading to React 19.

The React Compiler uses an internal hook for memoization, which provides automatic optimizations, whereas useMemo and useCallback require manual memoization.

There are no significant breaking changes reported when upgrading from React 18 to 19, but developers should always test their applications to ensure compatibility.

If issues arise after using the React Compiler, check for React rule violations, try resolving the error without the compiler, and provide feedback to the React Compiler working group.

React 19 enhances performance by using the React Compiler to auto-memoize code, reducing the need for manual memoization and optimizing component re-renders.

React 19 is currently in the Release Candidate (RC) stage and should be considered stable once it reaches the official stable release. Developers should monitor announcements from the React team for updates.

The main new features in React 19 include React Actions, auto-memoization by the React Compiler, and new hooks such as useActionState, useFormStatus, and a new API called Use.