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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SKILL.md
React Hooks Expert
Priority: P0 (CRITICAL)
Effects sync external systems. Everything else should stay in render, event handlers, or custom hooks.
Rules
- Effects: use
useEffectonly 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
useEffectEventwhen effect logic needs current props/state without widening dependencies. - Refs: store mutable, non-render state in
useRef. - Memoization: add
useMemo/useCallbackonly for measured hotspots or memoized child contracts. - Concurrency: use
startTransition/useDeferredValuefor non-urgent updates. - Fetch cleanup: use
AbortControllerwhen 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:
useEffectsubscriptions 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
useEffectto 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
Files
3- SKILL.md
db51d978492.5 KB - evals/evals.json
2392954a1d2.5 KB - references/REFERENCE.md
ebf38547ed3.1 KB
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