26. What's new in React 19?

React 19 introduces a range of new features and improvements aimed at enhancing performance, simplifying application development, and expanding developer tooling capabilities. Here are some key highlights:

1. Concurrent Rendering: Allows better management of rendering priorities, enabling smoother and more responsive user interfaces.
2. React Server Components: A new type of component that is rendered on the server, reducing the amount of JavaScript loaded into the browser and improving load times.
3. Streaming Server Rendering: Improves server-side rendering performance by allowing HTML to be streamed to the client incrementally.
4. Automatic Batching: Enhances performance by grouping multiple state updates and rendering them in a single operation.
5. New Hooks: Introduction of new hooks such as useDeferredValue and useTransition, which help manage state updates and optimize performance.
6. Performance Improvements: Various optimizations that increase the speed and responsiveness of React applications.

React 19 continues the tradition of introducing innovations and optimizations that help developers create fast, scalable, and responsive applications.