tee-talog https://blog.hatena.ne.jp/tee-talog/ ひびのログ https://www.tee-talog.com/ TypeScript 結論 type Head<T> = T extends [infer U, ...infer _] ? U : never type Tail<T> = T extends [infer _, ...infer U] ? U : never type NecessaryAndSufficientLoop<Union, Arr extends any[]> = Arr extends [] ? [Union] extends [never] ? [] : never : [ Head<Arr> extends Union ? Head<Arr> : never, ...NecessaryAndS… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.tee-talog.com%2Fentry%2F2024%2F03%2F20%2F195758" title="Union Types を過不足なく満たす配列かどうかチェックする関数 - ひびのログ" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2024-03-20 19:57:58 rich https://www.tee-talog.com/entry/2024/03/20/195758 1.0 100%