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PartialByKeys

提出詳細

type PartialByKeys_<T, K extends keyof T = keyof T> = Partial<T> & Omit<T, K>;

type PartialByKeys<T, K extends keyof T = keyof T> = MergeInsertions<
  PartialByKeys_<T, K>
>;


export type MergeInsertions<T> = T extends object
  ? { [K in keyof T]: MergeInsertions<T[K]> }
  : T;

提出日時	2023-05-25 04:31:27
問題	PartialByKeys
ユーザー	mrsekut
ステータス	Wrong Answer

テストケース

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

interface User {
  name: string
  age: number
  address: string
}

interface UserPartialName {
  name?: string
  age: number
  address: string
}

interface UserPartialNameAndAge {
  name?: string
  age?: number
  address: string
}

type cases = [
  Expect<Equal<PartialByKeys<User, 'name'>, UserPartialName>>,
  Expect<Equal<PartialByKeys<User, 'name' | 'unknown'>, UserPartialName>>,
  Expect<Equal<PartialByKeys<User, 'name' | 'age'>, UserPartialNameAndAge>>,
  Expect<Equal<PartialByKeys<User>, Partial<User>>>,
]