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livedash-node/.opencode/skills/vercel-react-best-practices/rules/client-swr-dedup.md
Kaj Kowalski 5bfd762e55 fix: comprehensive TypeScript/build fixes and modernization
- Update tsconfig to ES2024 target and bundler moduleResolution
- Add dynamic imports for chart.js and recharts (bundle optimization)
- Consolidate 17 useState into useReducer in sessions page
- Fix 18 .js extension imports across lib files
- Add type declarations for @rapideditor/country-coder
- Fix platform user types (PlatformUserRole enum)
- Fix Calendar component prop types
- Centralize next-auth type augmentation
- Add force-dynamic to all API routes (prevent build-time prerender)
- Fix Prisma JSON null handling with Prisma.DbNull
- Fix various type mismatches (SessionMessage, ImportRecord, etc.)
- Export ButtonProps from button component
- Update next-themes import path
- Replace JSX.Element with React.ReactElement
- Remove obsolete debug scripts and pnpm lockfile
- Downgrade eslint to v8 for next compatibility
2026-01-20 07:28:10 +01:00

1.1 KiB

title, impact, impactDescription, tags
title impact impactDescription tags
Use SWR for Automatic Deduplication MEDIUM-HIGH automatic deduplication client, swr, deduplication, data-fetching

Use SWR for Automatic Deduplication

SWR enables request deduplication, caching, and revalidation across component instances.

Incorrect (no deduplication, each instance fetches):

function UserList() {
  const [users, setUsers] = useState([])
  useEffect(() => {
    fetch('/api/users')
      .then(r => r.json())
      .then(setUsers)
  }, [])
}

Correct (multiple instances share one request):

import useSWR from 'swr'

function UserList() {
  const { data: users } = useSWR('/api/users', fetcher)
}

For immutable data:

import { useImmutableSWR } from '@/lib/swr'

function StaticContent() {
  const { data } = useImmutableSWR('/api/config', fetcher)
}

For mutations:

import { useSWRMutation } from 'swr/mutation'

function UpdateButton() {
  const { trigger } = useSWRMutation('/api/user', updateUser)
  return <button onClick={() => trigger()}>Update</button>
}

Reference: https://swr.vercel.app