타입스크립트 - as const
as const
값이 변하지 않는 것이 확실할 때 사용 (타입 고정)
readonly 속성이 붙음
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const obj = { name: "Hyemin" } as const;
// const obj: { readonly name: "Hyemin"; }
const arr = [1, 3, "five"] as const;
// const arr: readonly [1, 3, "five"]
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