ReactJS 19: The Significant Parts
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Concurrent Mode Enhancements:
The biggest improvements in ReactJS 19 have been made with Concurrent Mode, which not only keeps the UI smooth and responsive while your application updates itself but also ensures a seamless interface especially at complex transitions such as animations.
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Improved Server Components:
Following the lead of Python, in ReactJS 19 Server Components were further advanced with improved support and tooling to architect reliable and performant server-rendered components.
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Automatic Batching:
Changes to state/props are now automatically batched across asynchronicity events, reducing re-renders and generally speaking perform a lot better with much less need on the developers side.
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New JSX Transform:
The previous version the opened up JSX Transform also got several updates bringing better TypeScript and modern JavaScript tooling integration, along with bundle size reduction and build improvements.