React Server Components
RSC allows components to run on the server, directly accessing databases and file systems while reducing JavaScript sent to the client. Server components cannot use state or event handlers but can import client components.
use Hook
The use Hook introduced in React 19 reads Promise and Context values directly within components. Unlike useEffect, use can be used in conditionals and loops, offering more flexible data fetching patterns.
Concurrent Mode Improvements
Enhanced Suspense supports streaming SSR, progressively sending HTML to the client. The useTransition and useDeferredValue APIs are more stable, with smarter priority scheduling.
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