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PartialByKeys

提出詳細

type Pretty<T> = {
  [K in keyof T]: T[K]
}

type PartialByKeys<T, K = keyof T> = Pretty<{
  [P in keyof T as P extends K ? P : never]?: T[P]
} & {
  [P in Exclude<keyof T, K>]: T[P]
}>

提出日時	2023-08-13 09:33:01
問題	PartialByKeys
ユーザー	tekihei2317
ステータス	Accepted

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>>>,
]