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React 19 components and hooks.

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# React 19 Best Practices

Comprehensive performance optimization guide for React 19 applications. Contains 44 rules across 8 categories, prioritized by impact from critical (concurrent rendering, server components) to incremental (component patterns). Covers the React 19.3 stabilizations: `<ViewTransition>`, Fragment refs, and direct Context providers in Server Components.

## Table of Contents

1. [Concurrent Rendering](references/_sections.md#1-concurrent-rendering) — **CRITICAL**
   - 1.1 [Avoid Suspense Fallback Thrashing](references/conc-suspense-fallback.md) — HIGH (prevents flickering, smoother UX)
   - 1.2 [Leverage Automatic Batching for Fewer Renders](references/conc-automatic-batching.md) — HIGH (fewer renders in heavy updates)
   - 1.3 [Use useDeferredValue for Derived Expensive Values](references/conc-use-deferred-value.md) — CRITICAL (prevents jank in derived computations)
   - 1.4 [Use useTransition for Non-Blocking Updates](references/conc-use-transition.md) — CRITICAL (keeps UI responsive during heavy updates)
   - 1.5 [Write Concurrent-Safe Components](references/conc-concurrent-safe.md) — MEDIUM-HIGH
   - 1.6 [Animate UI Changes with ViewTransition](references/conc-view-transitions.md) — MEDIUM (native View Transition API animations without manual class juggling)
2. [Server Components](references/_sections.md#2-server-components) — **CRITICAL**