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Promise.all

提出詳細

type Resolve<T> = T extends Promise<infer R> ? R : T;

type ResultArray<T extends readonly any[]> = {[K in keyof T]: Resolve<T[K]>}

declare function PromiseAll<T extends any[]>(values: readonly [...T]): 
  Promise<ResultArray<T>>;
提出日時2022-10-12 14:54:03
問題Promise.all
ユーザーyotarotsukada
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]>>>,
]