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Kaj Kowalski
cd05fc8648
- Fix syntax errors in skills markdown files (.github/skills, .opencode/skills) - Change typescript to tsx for code blocks with JSX - Replace ellipsis (...) in array examples with valid syntax - Separate CSS from TypeScript into distinct code blocks - Convert JavaScript object examples to valid JSON in docs - Fix enum definitions with proper comma separation
1.2 KiB
1.2 KiB
title, impact, impactDescription, tags
| title | impact | impactDescription | tags |
|---|---|---|---|
| useLatest for Stable Callback Refs | LOW | prevents effect re-runs | advanced, hooks, useLatest, refs, optimization |
useLatest for Stable Callback Refs
Access latest values in callbacks without adding them to dependency arrays. Prevents effect re-runs while avoiding stale closures.
Implementation:
function useLatest<T>(value: T) {
const ref = useRef(value);
useLayoutEffect(() => {
ref.current = value;
}, [value]);
return ref;
}
Incorrect (effect re-runs on every callback change):
function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
const [query, setQuery] = useState("");
useEffect(() => {
const timeout = setTimeout(() => onSearch(query), 300);
return () => clearTimeout(timeout);
}, [query, onSearch]);
}
Correct (stable effect, fresh callback):
function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
const [query, setQuery] = useState("");
const onSearchRef = useLatest(onSearch);
useEffect(() => {
const timeout = setTimeout(() => onSearchRef.current(query), 300);
return () => clearTimeout(timeout);
}, [query]);
}