Simple custom hook for React to get the type of the nested child

A component may want to make assumptions about its children to satisfy layout constraints.

To satisfy this need in one of my projects, I have built a very simple custom hook and then decided to publish it publicly.

Here is the thread that describes the problem further: https://github.com/microsoft/TypeScript/issues/13618

I hope it can be helpful for someone. I also would like to hear if my approach has been already implemented by other repos, because I couldn't find any, back in time.

Thanks.