React 19 React 19 (stable since Dec 2024) simplifies async operations, improves SSR, and enhances DX with Actions, Server Components, and new hooks. When to Use - Building React 19 applications - Async form handling with automatic pending/error states - Server Components for SSR - Optimistic UI updates - Migrating from React 18 - Server Actions for full-stack forms Installation Required: Enable modern JSX transform in : Core Concepts Execution Boundaries | Type | Runs | State | Access | |------|------|-------|--------| | Server Component | Server | No | DB, FS, Secrets | | Client Component |…