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Sync with react.dev @ a1ddcf51 #900

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a1ddcf5
Add caveat to useId for cache keys (#8242)
rickhanlonii Jan 16, 2026
bbdacac
merging all conflicts
react-translations-bot Jan 19, 2026
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6 changes: 6 additions & 0 deletions src/content/reference/react/useId.md
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* `useId` はフックであるため、**コンポーネントのトップレベル**または独自のフック内でのみ呼び出すことができます。ループまたは条件分岐内で呼び出すことはできません。もし必要な場合は、新しいコンポーネントを作成し、状態を移動させる必要があります。

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* `useId` を、**リスト内の key の生成には使用しないでください**。[key はデータから生成される必要があります。](/learn/rendering-lists#where-to-get-your-key)
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* `useId` **should not be used to generate cache keys** for [use()](/reference/react/use). The ID is stable when a component is mounted but may change during rendering. Cache keys should be generated from your data.

* `useId` **should not be used to generate keys** in a list. [Keys should be generated from your data.](/learn/rendering-lists#where-to-get-your-key)
>>>>>>> a1ddcf51a08cc161182b90a24b409ba11289f73e

* `useId` currently cannot be used in [async Server Components](/reference/rsc/server-components#async-components-with-server-components).

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