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Get Optional

提出詳細

type GetOptional<T extends object> = {
  [P in keyof T as {} extends Pick<T, P> ? P:never]: T[P];
}
提出日時2022-06-28 10:31:10
問題Get Optional
ユーザーwaki285
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 }>>,
]