Types

This library was conceived before the TS and Flow teams had formalized how to type hooks. I still have not looked into it, but if someone knows how, it would be great to get some typing while the library is still so tiny.

I wouldn't even object to a strong TS lover converting the library itself to TS, ideally with Flow types also exported.

Thanks in advance. 🙏

Start by reviewing the library's current JavaScript hook API and determining how its types should be represented for TypeScript and Flow. The scope includes either adding type coverage or converting the library, with exported Flow types as a stated goal; done means the public hooks are typed and those types are available to consumers.

Written by the indexing model from the issue text.