Fix TS type definitions and build command

[volkipp]

This should fix those straggling Typescript types which were generating errors on the build command. This also fixes an eslint error which failed if there were no files with ts or tsx extensions in the project.

[AustinGil]

Thanks @volkipp. I added these fixes on my local branch already based on your previous comments. But I haven't pushed up yet. I think we have some minor differences, but I'll go ahead and merge this and reconcile those.

Any reason you added the --no-error-on-unmatched-pattern flag for eslint?

[volkipp]

Oh sure I didn’t know if you had gotten around to it or not so I just went for it. I added —no-error-on-unmatched-pattern because eslint didn’t like that there were no tsx files or (at the time) ts files. It took awhile to track down that eslint expects every pattern to be matched and if it’s not it throws an error by default, which seems pretty ridged to me.

[AustinGil]

Yeah all good. It's pretty much the same thing anyway and I appreciate you putting in the work on it :)