react-19-handbook

Teaches building and reviewing React 19 interfaces — function components with typed props, the complete built-in hook set including useActionState, useOptimistic and use, concurrent rendering with transitions and deferred values, server components and server functions, the React DOM client APIs createRoot, hydrateRoot, createPortal and flushSync, and performance work with memoization, code splitting and list virtualisation. Use when creating, extending or debugging React 19 code, choosing a state or effect hook, designing the server-client split, wiring the app's mount point, or diagnosing re-render storms, stale closures and hydration mismatches. Not for React Native, other UI frameworks, or general TypeScript, CSS and bundler configuration.

Version

v1.0.0

Size

27 KB

Updated

2026-10-06

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