Dealing with returning nulls for optional scalar or empty message fields

[MarcPorciuncula]

Just started introducing twirp-ts with protobuf-ts to an existing codebase and we currently use null for empty values in our data types. Since protobuf-ts represents optional scalars and empty message fields as undefined it's a little awkward implementing twirp servers as we have to map all our existing types to replace the nulls with undefineds before we return them.

It seems like I could do it automatically with an interceptor but I would still get type errors providing our types where the protobuf-ts generated type is expected.

Is there anything we could do to make this easier and avoid having to manually map/change our existing types? Has anyone had a similar experience before?