type-challenges-judge

Type Challenges Judge

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PickByType

提出詳細

type PickByType<T extends object, U extends unknown> = {
  [P in keyof T as T[P] extends U ? P : never]: T[P]
}

提出日時	2025-09-16 04:20:46
問題	PickByType
ユーザー	balckowl
ステータス	Accepted

テストケース

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

interface Model {
  name: string
  count: number
  isReadonly: boolean
  isEnable: boolean
}

type cases = [
  Expect<Equal<PickByType<Model, boolean>, { isReadonly: boolean; isEnable: boolean }>>,
  Expect<Equal<PickByType<Model, string>, { name: string }>>,
  Expect<Equal<PickByType<Model, number>, { count: number }>>,
]