improve type definitions

[manvydasu]

#158

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[ramonsnir]

@tbleckert Hi, this wrong type is blocking us from using this library with TypeScript. Can you take a look and review it or merge it?

I see there's a small merge conflict, but it's very minor. If you need help with it because you're busy, I'll gladly help.

Thanks, we love this library (although using it with non-TS JS now :smile: )!

[AndrejGajdos]

@tbleckert any update on this?

[potatosenior]

Why is this still open?

[and-poulsen]

@tbleckert, this would be lovely to merge in 😌