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Get Optional

提出詳細

type GetOptional<T,U=Required<T>> = {
  [K in keyof T as K extends keyof U ? T[K] extends U[K] ? never : K : never]: T[K]
}
提出日時2023-09-22 15:36:10
問題Get Optional
ユーザーsankantsu
ステータスAccepted
テストケース
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<GetOptional<{ foo: number; bar?: string }>, { bar?: string }>>,
  Expect<Equal<GetOptional<{ foo: undefined; bar?: undefined }>, { bar?: undefined }>>,
]