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【TS】as constに関するメモ

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配列にas constをつけると読み取り専用のタプル型になる


// arr:number[]
const arr = [10, 20];

// arr1:readonly [10, 20] (数字リテラルの読み取り専用タプル型)
const arr1 = [10, 20] as const;

// as constを使わずに↑のようにしたい場合は、↓のように値と同じ型注釈が必要
// これがめんどい
// arr2:readonly [10, 20]
const arr2: [10, 20] = [10, 20];
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