react
React 19 Best Practices
Comprehensive React 19/19.2 best-practices guide for AI agents. Contains 44 rules across 8 categories, prioritized by impact from critical (concurrent rendering, server components) to incremental (component patterns). Reflects React 19 headline changes: ref as a regular prop (forwardRef deprecated), native document metadata, resource preload APIs, useActionState, useOptimistic, use() hook, and <Context> as provider.
When to Apply
- Writing new React components or refactoring existing ones
- Migrating from React 18 to React 19 (forwardRef → ref-as-prop,
<Context.Provider>→<Context>,useFormState→useActionState) - Optimizing re-render performance or bundle size
- Using concurrent features (useTransition, useDeferredValue, Activity)
- Setting up Server Components or server/client boundaries
- Implementing form actions, optimistic updates, or data fetching
- Configuring React Compiler for automatic memoization
- Reviewing React code for common anti-patterns or outdated React 18 idioms
Rule Categories
| Category | Impact | Rules | Key Topics |
|---|
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