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TypeScriptで自己参照

Posted at

自己参照っていう言い方が正しいかわからないですが。。

たとえばこういうやつ :point_down:
冗長なのでもっと楽したい。けどわざわざ型を追加したくもない。

interface Player {
  status: "playing" | "stopped";
  prevStatus: "playing" | "stopped";
}

環境

TypeScript 3.6.2

こうやる

thisを使います。

interface Player {
  status: "playing" | "stopped";
  prevStatus: this["status"];
}

以上です :hugging:

参考

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