type-challenges-judge

Type Challenges Judge

Problems

Progress

Promise.all

提出詳細

// T extends readonly unknown[]だとreadonly配列が返却されるため[...T]が必要
declare function PromiseAll<T extends unknown[]>(args: readonly [...T]): Promise<{
  [P in keyof T]: T[P] extends Promise<infer S> ? S : T[P]
}>

提出日時	2023-04-30 22:23:55
問題	Promise.all
ユーザー	Dowanna
ステータス	Accepted

テストケース

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

const promiseAllTest1 = PromiseAll([1, 2, 3] as const)
const promiseAllTest2 = PromiseAll([1, 2, Promise.resolve(3)] as const)
const promiseAllTest3 = PromiseAll([1, 2, Promise.resolve(3)])

type cases = [
  Expect<Equal<typeof promiseAllTest1, Promise<[1, 2, 3]>>>,
  Expect<Equal<typeof promiseAllTest2, Promise<[1, 2, number]>>>,
  Expect<Equal<typeof promiseAllTest3, Promise<[number, number, number]>>>,
]