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[TypeScript] ReturnTypeで関数の戻り値の型を取得する。

Last updated at Posted at 2021-07-26

Formikの型を付けたかったのですが、
useFormikの戻り値の型が見当たらなかったので、
関数の戻り値から型をつけるようにしました。

ReturnTypeを使ってこんな感じで取得できます。

ReturnType<typeof useFormik>

公式だと以下のページに記載がありました。

TypeScript | Utility Types

Utility Typesには他にも便利そうな型が多いですね。どんどん使っていきたいです。

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