c86c93582e
- Add 8 new skills (62 total, up from 58) - Official Anthropic skills: docx, pdf, pptx, xlsx, brand-guidelines, internal-comms - Vercel Labs skills: react-best-practices, web-design-guidelines - Implement dual-versioning: -official/-anthropic and -community suffixes - Update README with new skill registry and credits - Regenerate skills_index.json (62 skills validated) - Add comprehensive walkthrough.md BREAKING CHANGE: Document skills (docx/pdf/pptx/xlsx) renamed with version suffixes
40 lines
973 B
Markdown
40 lines
973 B
Markdown
---
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title: Defer State Reads to Usage Point
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impact: MEDIUM
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impactDescription: avoids unnecessary subscriptions
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tags: rerender, searchParams, localStorage, optimization
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---
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## Defer State Reads to Usage Point
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Don't subscribe to dynamic state (searchParams, localStorage) if you only read it inside callbacks.
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**Incorrect (subscribes to all searchParams changes):**
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```tsx
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function ShareButton({ chatId }: { chatId: string }) {
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const searchParams = useSearchParams()
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const handleShare = () => {
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const ref = searchParams.get('ref')
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shareChat(chatId, { ref })
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}
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return <button onClick={handleShare}>Share</button>
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}
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```
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**Correct (reads on demand, no subscription):**
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```tsx
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function ShareButton({ chatId }: { chatId: string }) {
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const handleShare = () => {
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const params = new URLSearchParams(window.location.search)
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const ref = params.get('ref')
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shareChat(chatId, { ref })
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}
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return <button onClick={handleShare}>Share</button>
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}
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```
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