shadcn-themer / rules
Cursor rule325 starsChanged 13 months agoMITView on GitHub
Enforce awaiting Next.js dynamic route params (Next 15+ app router). Apply when editing dynamic segment files (pages, route handlers, generateMetadata/generateStaticParams) so params is typed as Promise and awaited before use.
We split this next-dynamic-params.mdc into the rules it gives an agent
1 rule. About 0 are common, 0 are distinctive, and 1 is very specific to this project.
≈0
Common · estimate
Many files like this have a rule of this kind.
≈0
Distinctive · estimate
This author's own choices. Worth a look.
1
Very specific
Tied to their project's names, files or tools. Probably skip.
- Common
- Distinctive
- Very specific
- Very specific: line 33
Always await params before destructuring Next.js dynamic route params (Next 15+)
≈ “Common” is an estimate: at least 1 in 5 of the 6,350 Cursor rule files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
Files
---
description: Enforce awaiting Next.js dynamic route params (Next 15+ app router). Apply when editing dynamic segment files (pages, route handlers, generateMetadata/generateStaticParams) so params is typed as Promise and awaited before use.
alwaysApply: false
---
Rule
- In app router files for dynamic routes, `params` is async. Always await it before using.
- Function signatures must reflect this by making the component/handler `async` and typing `params` as a Promise.
Do
```ts
type PageProps = { params: Promise<{ id: string }> }
export default async function Page({ params }: PageProps) {
const { id } = await params
// ...
}
```
Don’t
```ts
type PageProps = { params: { id: string } }
export default function Page({ params }: PageProps) {
const { id } = params // ❌ params must be awaited
}
```
Also applies to
- `generateMetadata`, `generateStaticParams`, and Route Handlers in dynamic segments
Checklist
- Component/handler is `async`
- `params` type is `Promise<...>`
- Always `await params` before destructuring
Next.js dynamic route params (Next 15+)
Rule
- In app router files for dynamic routes, `params` is async. Always await it before using.
- Function signatures must reflect this by making the component/handler `async` and typing `params` as a Promise.
Do
```ts
type PageProps = { params: Promise<{ id: string }> }
export default async function Page({ params }: PageProps) {
const { id } = await params
// ...
}
```
Don’t
```ts
type PageProps = { params: { id: string } }
export default function Page({ params }: PageProps) {
const { id } = params // ❌ params must be awaited
}
```
Also applies to
- `generateMetadata`, `generateStaticParams`, and Route Handlers in dynamic segments
Checklist
- Component/handler is `async`
- `params` type is `Promise<...>`
- Always `await params` before destructuring
Where files are headingNew Cursor rule files have more rules about planning and tracking tasks, and fewer about code style.
Of the Cursor rule files we read, the 3,978 first seen in the last six months, against the older ones: the kind of rule that gained most share, and the kind that lost most. About files like this in general, not this one, and an estimate, since a kind is a pattern in the words.
In this repository3 other files it gives its agents.
- .cursor/rules/conventions.mdcCursor rule
- .cursor/rules/db-migrations.mdcCursor rule
- .cursor/rules/hono-rpc.mdcCursor rule
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