generated from allagroup/nextjs-elysia-allaos
40 lines
1.1 KiB
Markdown
40 lines
1.1 KiB
Markdown
---
|
|
title: useEffectEvent for Stable Callback Refs
|
|
impact: LOW
|
|
impactDescription: prevents effect re-runs
|
|
tags: advanced, hooks, useEffectEvent, refs, optimization
|
|
---
|
|
|
|
## useEffectEvent for Stable Callback Refs
|
|
|
|
Access latest values in callbacks without adding them to dependency arrays. Prevents effect re-runs while avoiding stale closures.
|
|
|
|
**Incorrect (effect re-runs on every callback change):**
|
|
|
|
```tsx
|
|
function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
|
|
const [query, setQuery] = useState('');
|
|
|
|
useEffect(() => {
|
|
const timeout = setTimeout(() => onSearch(query), 300);
|
|
return () => clearTimeout(timeout);
|
|
}, [query, onSearch]);
|
|
}
|
|
```
|
|
|
|
**Correct (using React's useEffectEvent):**
|
|
|
|
```tsx
|
|
import { useEffectEvent } from 'react';
|
|
|
|
function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
|
|
const [query, setQuery] = useState('');
|
|
const onSearchEvent = useEffectEvent(onSearch);
|
|
|
|
useEffect(() => {
|
|
const timeout = setTimeout(() => onSearchEvent(query), 300);
|
|
return () => clearTimeout(timeout);
|
|
}, [query]);
|
|
}
|
|
```
|