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Get Readonly Keys

提出詳細

type GetReadonlyKeys<T> = keyof { [P in keyof T as Equal<Pick<T, P>, Readonly<Pick<T, P>>> extends true ? P : never]: never }
提出日時2024-09-13 15:51:40
問題Get Readonly Keys
ユーザーookkoouu
ステータスAccepted
テストケース
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<'title', GetReadonlyKeys<Todo1>>>,
  Expect<Equal<'title' | 'description', GetReadonlyKeys<Todo2>>>,
]

interface Todo1 {
  readonly title: string
  description: string
  completed: boolean
}

interface Todo2 {
  readonly title: string
  readonly description: string
  completed?: boolean
}