Open lxxmnmn opened 2 months ago
내장 제네릭 ReturnType<T>을 이를 사용하지 않고 구현하세요.
ReturnType<T>
/* _____________ Your Code Here _____________ */ type MyReturnType<T extends (...args: any) => any> = T extends (...args: any) => infer R ? R : never;
/* _____________ Test Cases _____________ */ import type { Equal, Expect } from '@type-challenges/utils' type cases = [ Expect<Equal<string, MyReturnType<() => string>>>, Expect<Equal<123, MyReturnType<() => 123>>>, Expect<Equal<ComplexObject, MyReturnType<() => ComplexObject>>>, Expect<Equal<Promise<boolean>, MyReturnType<() => Promise<boolean>>>>, Expect<Equal<() => 'foo', MyReturnType<() => () => 'foo'>>>, Expect<Equal<1 | 2, MyReturnType<typeof fn>>>, Expect<Equal<1 | 2, MyReturnType<typeof fn1>>>, ] type ComplexObject = { a: [12, 'foo'] bar: 'hello' prev(): number } const fn = (v: boolean) => v ? 1 : 2 const fn1 = (v: boolean, w: any) => v ? 1 : 2
Get Return Type
내장 제네릭
ReturnType<T>
을 이를 사용하지 않고 구현하세요.