223-isany.ts

/**
 * 223 - IsAny
 *
 * Sometimes it's useful to detect if you have a value with `any` type. This is especially helpful while working with third-party Typescript modules, which can export `any` values in the module API. It's also good to know about `any` when you're suppressing implicitAny checks.
 *
 * So, let's write a utility type `IsAny<T>`, which takes input type `T`. If `T` is `any`, return `true`, otherwise, return `false`.
 *
 *
 * <!--info-footer-start--><br><a href="../../README.md" target="_blank"><img src="https://img.shields.io/badge/-Back-grey" alt="Back"/></a> <a href="https://tsch.js.org/223/answer" target="_blank"><img src="https://img.shields.io/badge/-Share%20your%20Solutions-teal" alt="Share your Solutions"/></a> <a href="https://tsch.js.org/223/solutions" target="_blank"><img src="https://img.shields.io/badge/-Check%20out%20Solutions-de5a77?logo=awesome-lists&logoColor=white" alt="Check out Solutions"/></a> <hr><h3>Related Challenges</h3><a href="https://github.com/type-challenges/type-challenges/blob/main/questions/01042-medium-isnever/README.md" target="_blank"><img src="https://img.shields.io/badge/-1042%E3%83%BBIsNever-d9901a" alt="1042・IsNever"/></a>  <a href="https://github.com/type-challenges/type-challenges/blob/main/questions/01097-medium-isunion/README.md" target="_blank"><img src="https://img.shields.io/badge/-1097%E3%83%BBIsUnion-d9901a" alt="1097・IsUnion"/></a>  <a href="https://github.com/type-challenges/type-challenges/blob/main/questions/04484-medium-istuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-4484%E3%83%BBIsTuple-d9901a" alt="4484・IsTuple"/></a> <!--info-footer-end-->
 */

/* _____________ Your Code Here _____________ */

type MyEqual<A, B> =
  (<T>() => T extends A ? 1 : 0) extends
  (<T>() => T extends B ? 1 : 0) ? true : false;

type IsAny<T> = MyEqual<T, any>

/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<IsAny<any>, true>>,

  Expect<Equal<IsAny<undefined>, false>>,
  Expect<Equal<IsAny<unknown>, false>>,
  Expect<Equal<IsAny<never>, false>>,
  Expect<Equal<IsAny<string>, false>>,
]