Export IDOption type

[Snailed]

Solution to issue #134
This change will make the IDOption type included in the built types, which will allow tsc to understand the DataOptions and OnceDataOptions types.

This is my first Open Source contribution, so I hope I did it right 😅

[chrisbianca]

@Snailed Congrats on your first Open Source contribution! Thank you for the submission, and sorry that it's taken so long to get this merged. It's interesting that IDOption needs to be exported at all, as it's only referenced within the file that it's defined in. It must be to do with how tsc is exporting the other types in the file.

I'll get this released shortly.