Back to Type Challenges

README

questions/00223-hard-isany/README.md

latest2.2 KB
Original Source
<!--info-header-start--><h1>IsAny </h1><blockquote><p>by Pavel Glushkov <a href="https://github.com/pashutk" target="_blank">@pashutk</a></p></blockquote><p><a href="https://tsch.js.org/223/play" target="_blank"></a> &nbsp;&nbsp;&nbsp;<a href="./README.ja.md" target="_blank"></a> </p><!--info-header-end-->

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-->

<a href="../../README.md" target="_blank"></a> <a href="https://tsch.js.org/223/answer" target="_blank"></a> <a href="https://tsch.js.org/223/solutions" target="_blank"></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"></a> <a href="https://github.com/type-challenges/type-challenges/blob/main/questions/01097-medium-isunion/README.md" target="_blank"></a> <a href="https://github.com/type-challenges/type-challenges/blob/main/questions/04484-medium-istuple/README.md" target="_blank"></a> <!--info-footer-end-->