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react-hooks

Write React hooks with clean effect boundaries and measured memoization. Use when working with `useEffect`, custom hooks, refs, transitions, or hook dependency problems in React.

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  • evals/evals.json2.5 KB
  • references/REFERENCE.md3.1 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

React Hooks Expert

Priority: P0 (CRITICAL)

Effects sync external systems. Everything else should stay in render, event handlers, or custom hooks.

Rules

  • Effects: use useEffect only for subscriptions, timers, network lifecycle, DOM APIs, or other external systems.
  • Dependency churn: objects recreated each render cause unstable dependencies; move to primitives, refs, or measured memoization.
  • Effect events: use useEffectEvent when effect logic needs current props/state without widening dependencies.
  • Refs: store mutable, non-render state in useRef.
  • Memoization: add useMemo / useCallback only for measured hotspots or memoized child contracts.
  • Concurrency: use startTransition / useDeferredValue for non-urgent updates.
  • Fetch cleanup: use AbortController when an effect owns request cancellation.

Verify

  • Hooks stay at top level.
  • Effects have cleanup when they subscribe, attach, or schedule.
  • No effect exists only to derive render state from other render state.
  • Dependency arrays reflect real external dependencies.
  • Custom hooks hide internal wiring and expose a small API.

Performance Checklist (Mandatory)

  • Rules of Hooks: Called at top level? No loops/conditions?
  • Dependencies: object/function deps exist for a reason, not by accident?
  • Cleanup: useEffect subscriptions return cleanup functions?
  • Render Count: component re-render excessively?

Anti-Patterns

  • No Missing Deps: Fix logic, don't disable linter.
  • No giant effects: Split unrelated sync concerns.
  • No Derived State: Compute during render, don't useEffect to sync state.
  • No Heavy Init: Use lazy state initialization useState(() => heavy()).

References

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • cleanup
  • recreated

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