Udit TakkarandGitHub
7a9fdd5a0c
## What does this PR do? This PR adds https://vercel.com/blog/introducing-react-best-practices for your coding agent using `npx add-skill vercel-labs/agent-skills` command The skills are added to `.claude/`, `.cursor/`, and `.opencode/` directories to provide React and Next.js performance optimization guidance for AI-assisted workflows. ## Updates since last revision Addressed Cubic AI review feedback for issues with confidence >= 9/10: - **rerender-dependencies.md** - Replaced `console.log(user.id)` with `fetchUserDetails(user.id)` to avoid logging sensitive information - **server-after-nonblocking.md** - Removed `sessionCookie` from `logUserAction` call to avoid logging sensitive authentication data, added `await` to async call - **bundle-conditional.md** - Added `loadError` state and `setLoadError` setter to fix undefined `setEnabled` reference - **advanced-event-handler-refs.md** - Updated `useWindowEvent` handler signature to accept `Event` parameter and forward it to the stored handler - **rerender-derived-state.md** - Closed `<nav>` elements in both examples for valid JSX Fixes applied to both `.claude` and `.cursor` skill directories for consistency. ## Mandatory Tasks (DO NOT REMOVE) - [x] I have self-reviewed the code (A decent size PR without self-review might be rejected). - [x] N/A I have updated the developer docs in /docs if this PR makes changes that would require a [documentation change](https://cal.com/docs). If N/A, write N/A here and check the checkbox. - [x] N/A, I confirm automated tests are in place that prove my fix is effective or that my feature works. ## How should this be tested? These are documentation files for AI coding agents. No runtime testing required - review the markdown files to verify the example code snippets are correct. ## Checklist for human review - [ ] Verify example code snippets in the skill files are syntactically correct - [ ] Confirm the fixes don't introduce new issues in the documentation examples - [ ] Check that `.claude` and `.cursor` directories have consistent content --- Link to Devin run: https://app.devin.ai/sessions/f7f7e67fdeea4b22a4817d63ed9e1759 Requested by: unknown ()
74 lines
2.0 KiB
Markdown
74 lines
2.0 KiB
Markdown
---
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title: Use after() for Non-Blocking Operations
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impact: MEDIUM
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impactDescription: faster response times
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tags: server, async, logging, analytics, side-effects
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---
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## Use after() for Non-Blocking Operations
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Use Next.js's `after()` to schedule work that should execute after a response is sent. This prevents logging, analytics, and other side effects from blocking the response.
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**Incorrect (blocks response):**
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```tsx
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import { logUserAction } from '@/app/utils'
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export async function POST(request: Request) {
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// Perform mutation
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await updateDatabase(request)
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// Logging blocks the response
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const userAgent = request.headers.get('user-agent') || 'unknown'
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await logUserAction({ userAgent })
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return new Response(JSON.stringify({ status: 'success' }), {
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status: 200,
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headers: { 'Content-Type': 'application/json' }
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})
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}
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```
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**Correct (non-blocking):**
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```tsx
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import { after } from 'next/server'
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import { headers, cookies } from 'next/headers'
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import { logUserAction } from '@/app/utils'
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export async function POST(request: Request) {
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// Perform mutation
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await updateDatabase(request)
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// Log after response is sent
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after(async () => {
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const userAgent = (await headers()).get('user-agent') || 'unknown'
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const sessionCookie = (await cookies()).get('session-id')?.value || 'anonymous'
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logUserAction({ sessionCookie, userAgent })
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})
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return new Response(JSON.stringify({ status: 'success' }), {
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status: 200,
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headers: { 'Content-Type': 'application/json' }
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})
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}
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```
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The response is sent immediately while logging happens in the background.
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**Common use cases:**
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- Analytics tracking
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- Audit logging
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- Sending notifications
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- Cache invalidation
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- Cleanup tasks
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**Important notes:**
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- `after()` runs even if the response fails or redirects
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- Works in Server Actions, Route Handlers, and Server Components
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Reference: [https://nextjs.org/docs/app/api-reference/functions/after](https://nextjs.org/docs/app/api-reference/functions/after)
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