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yoshinani-cursor-rules
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---
alwaysApply: true
---
# Next.jsのパラメータ処理ガイドライン
## パラメータの型定義
### 基本ルール
- `params`と`searchParams`は必ず`Promise`型として定義する
- 型は明示的に定義し、`any`の使用は避ける
- パラメータの型は別途型定義として切り出す
```tsx
type PageParams = {
slug: string
}
export default async function Page({
params,
searchParams,
}: {
params: Promise<PageParams>
searchParams: Promise<{ [key: string]: string | string[] | undefined }>
}) {
// ...
}
```
## コンポーネントの責務分離
### Server Component
- パラメータの解決とバリデーションはServer Componentで行う
- 解決済みの値のみをClient Componentに渡す
- エラー処理(`notFound()`、`redirect()`など)はServer Componentで実装
### Client Component
- Client ComponentではPromiseとして渡されたパラメータを直接扱わない
- 解決済みの値のみを受け取る
- パラメータのバリデーションやエラー処理は行わない
## パラメータ処理のベストプラクティス
### 検証とエラー処理
- パラメータの検証は必ずServer Componentの先頭で行う
- 不正な値の場合は`notFound()`や`redirect()`で適切に処理
- 必要に応じてzodなどのバリデーションライブラリを使用
### searchParamsの処理
- `searchParams`の値は常に文字列として提供される
- 数値が必要な場合は明示的に型変換を行う
- オプショナルなパラメータにはデフォルト値を設定
```tsx
const { page } = await searchParams
const pageNumber = page ? parseInt(page, 10) : 1
```
## セキュリティ考慮事項
- ユーザー入力として扱い、適切なサニタイズを行う
- SQLインジェクションやXSSを防ぐため、エスケープ処理を実装
- 機密情報は`searchParams`に含めない
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