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1.1 KiB
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