f6bcc86881
New skills: - next-best-practices: Next.js 15+ RSC, async patterns, self-hosting (vercel-labs) - better-auth-best-practices: Official Better-Auth with Drizzle adapter (better-auth) - verification-before-completion: Evidence-based completion claims (obra/superpowers) - shadcn-ui: Component patterns with Tailwind v4 adaptation note (developer-kit) - writing-skills: TDD methodology for skill authoring (obra/superpowers) README reorganized by category with Mosaic Stack alignment section. Total: 9 skills (4 existing + 5 new). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
88 lines
1.6 KiB
Markdown
88 lines
1.6 KiB
Markdown
# Async Patterns
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In Next.js 15+, `params`, `searchParams`, `cookies()`, and `headers()` are asynchronous.
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## Async Params and SearchParams
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Always type them as `Promise<...>` and await them.
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### Pages and Layouts
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```tsx
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type Props = { params: Promise<{ slug: string }> }
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export default async function Page({ params }: Props) {
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const { slug } = await params
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}
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```
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### Route Handlers
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```tsx
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export async function GET(
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request: Request,
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{ params }: { params: Promise<{ id: string }> }
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) {
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const { id } = await params
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}
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```
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### SearchParams
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```tsx
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type Props = {
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params: Promise<{ slug: string }>
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searchParams: Promise<{ query?: string }>
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}
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export default async function Page({ params, searchParams }: Props) {
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const { slug } = await params
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const { query } = await searchParams
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}
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```
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### Synchronous Components
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Use `React.use()` for non-async components:
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```tsx
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import { use } from 'react'
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type Props = { params: Promise<{ slug: string }> }
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export default function Page({ params }: Props) {
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const { slug } = use(params)
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}
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```
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### generateMetadata
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```tsx
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type Props = { params: Promise<{ slug: string }> }
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export async function generateMetadata({ params }: Props): Promise<Metadata> {
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const { slug } = await params
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return { title: slug }
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}
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```
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## Async Cookies and Headers
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```tsx
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import { cookies, headers } from 'next/headers'
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export default async function Page() {
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const cookieStore = await cookies()
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const headersList = await headers()
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const theme = cookieStore.get('theme')
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const userAgent = headersList.get('user-agent')
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}
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```
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## Migration Codemod
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```bash
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npx @next/codemod@latest next-async-request-api .
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```
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