I’ve had a lot of success with grpc web. Had to patch a couple of things along the way. My biggest misgiving is thinking having bigints would be a good idea (it is not a good idea). Aside from that though, I’ve been happy with it. What felt broken to you?
One thing I still struggle to this day is the float/long conversion from json <-> proto. It somehow works and I still untangle the feeling of magic.
Its generated "TypeScript"... wasn't.