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Required Keys

提出詳細

type RequiredKeys<T> = keyof { [P in keyof T as Pick<T, P> extends Required<Pick<T, P>> ? P : never]: T[P] }

提出日時	2024-09-12 08:04:58
問題	Required Keys
ユーザー	ookkoouu
ステータス	Accepted

テストケース

import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<RequiredKeys<{ a: number; b?: string }>, 'a'>>,
  Expect<Equal<RequiredKeys<{ a: undefined; b?: undefined }>, 'a'>>,
  Expect<Equal<RequiredKeys<{ a: undefined; b?: undefined; c: string; d: null }>, 'a' | 'c' | 'd'>>,
  Expect<Equal<RequiredKeys<{}>, never>>,
]