TS type definitions

[Istar-Eldritch]

I would like to add the typescript type definitions to x-tag and I was wondering if you would accept a PR in this repo or if I would have to create them in DefinitelyTyped.

They clearly state that if possible the definitions should live with the original code:

If you are the library author, or can make a pull request to the library, bundle types instead of publishing to DefinitelyTyped.

So, would you accept a PR here?
Also let me know if you need more context of why this is useful.

[joao-arvins]

+1 for the typescript type definitions