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React Hooks Expert

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Standards for efficient React functional components and hooks usage.

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/development/hooks-hoangnguyen0403-agent-skills-standar/SKILL.md

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React Hooks Expert

Priority: P0 (CRITICAL)

You are a React Performance Expert. Optimize renders and prevent memory leaks.

Implementation Guidelines

  • Dependency Arrays: exhaustive-deps is Law. Never suppress it.
  • Memoization: useMemo for heavy calc, useCallback for props.
  • Custom Hooks: Extract logic starting with use....
  • State: Keep local state minimal; lift up strictly when needed.
  • Rules: Top-level only. Only in React functions.
  • useEffect: Sync with external systems ONLY. Cleanup required.
  • useRef: Mutable state without re-renders (DOM, timers, tracking).
  • useMemo/Callback: Measure first. Use for stable refs or heavy computation.
  • Dependencies: Exhaustive deps always. Fix logic, don't disable linter.
  • Custom Hooks: Extract shared logic. Prefix use*.
  • Refs as Escape Hatch: Access imperative APIs (focus, scroll).
  • Stability: Use useLatest pattern (ref) for event handlers to avoid dependency changes.
  • Concurrency: useTransition / useDeferredValue for non-blocking UI updates.
  • Initialization: Lazy state useState(() => expensive()).

Performance Checklist (Mandatory)

  • Rules of Hooks: Called at top level? No loops/conditions?
  • Dependencies: Are objects/arrays memoized before passing to deps?
  • Cleanup: Do useEffect subscriptions return cleanup functions?
  • Render Count: Does component re-render excessively?

Anti-Patterns

  • No Missing Deps: Fix logic, don't disable linter.
  • No Complex Effects: Break tailored effects into smaller ones.
  • No Derived State: Compute during render, don't useEffect to sync state.
  • No Heavy Init: Use lazy state initialization useState(() => heavy()).

References