docs(vercel-react-best-practices): 添加 Vercel React 最佳实践规则文档
- 添加 sections 定义文件,包含性能优化各领域分类 - 添加规则模板文件,规范文档结构和标签定义 - 添加异步操作优化规则,包括防止瀑布流、并行化、延迟等待等 - 添加包大小优化规则,包括避免桶式导入、动态导入、预加载等 - 添加服务端性能优化规则,包括 API 路
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---
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title: useEffectEvent for Stable Callback Refs
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impact: LOW
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impactDescription: prevents effect re-runs
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tags: advanced, hooks, useEffectEvent, refs, optimization
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---
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## useEffectEvent for Stable Callback Refs
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Access latest values in callbacks without adding them to dependency arrays. Prevents effect re-runs while avoiding stale closures.
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**Incorrect (effect re-runs on every callback change):**
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```tsx
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function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
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const [query, setQuery] = useState('')
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useEffect(() => {
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const timeout = setTimeout(() => onSearch(query), 300)
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return () => clearTimeout(timeout)
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}, [query, onSearch])
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}
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```
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**Correct (using React's useEffectEvent):**
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```tsx
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import { useEffectEvent } from 'react';
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function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
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const [query, setQuery] = useState('')
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const onSearchEvent = useEffectEvent(onSearch)
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useEffect(() => {
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const timeout = setTimeout(() => onSearchEvent(query), 300)
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return () => clearTimeout(timeout)
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}, [query])
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}
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```
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