reactlisted

# React — Skills Reference ## Overview No vendor certification exists for React. This playbook encodes the working competence applied when building, reviewing, or debugging a React application — anchored entirely on official React documentation (react.dev) and broadly accepted community best practices. Anchor all claims to react.dev; verify against it before acting. **Scope of this skill:** React itself — components, hooks, state, rendering, data-fetching patterns, accessibility, and testing. Framework concerns (Next.js App Router, Server Components, Expo) are deferred to the `nextjs` and `react-native` sibling skills. > **Load this skill when…** writing or reviewing React components, hooks, or state architecture; debugging re-renders, stale closures, or effect dependencies; auditing accessibility (ARIA, focus management); writing or fixing React Testing Library tests. > **Not this skill:** Next.js App Router, Server/Client Components, Server Actions → see `nextjs`; React Native / Expo mobile apps → see `react-native`. > Study resources and data-fetching library links live in [references/study-resources.md](references/study-resources.md). > **Verify steps assume nothing about your tooling** — use your project's own scripts and the language toolchain (`tsc`, `node`, the test runner, the package manager), in that order of preference. --- ## Uncertainty & Escalation - **Always re-verify live:** React evolves rapidly — hooks, concurrent features, and the React Compiler c