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Promise.all

提出詳細

type UnwrapPromise<T> = T extends Promise<infer Inner> ? Inner : T;

type PromiseAllReturn<T extends readonly any[]> = T extends readonly [infer First, ...infer Rest]
  ? [UnwrapPromise<First>, ...PromiseAllReturn<Rest>]
  : [];

declare function PromiseAll<T extends readonly any[]>(values: readonly [...T]): Promise<PromiseAllReturn<T>>;

提出日時	2023-08-10 08:20:32
問題	Promise.all
ユーザー	tekihei2317
ステータス	Wrong Answer

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]>>>,
]