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React 19.2's Activity component preserves unmounted component state without CSS hacks. Learn when to use it for forms, video players, and dashboards—and when display:none still wins.

Master React 19's concurrent rendering primitives—Actions, useTransition, and Suspense—to build responsive UIs that handle async operations without jank or loading spinners.

Node.js 24's native TypeScript support eliminates the build step for production deployments. Understand the runtime type stripping mechanism, performance implications, and when to migrate from traditional build pipelines.