Another one I saw recently that looks really promising in this vein is gql.tada, which provides some very nice LSP support. Anything in the TS space endorsed by Matt Pocock immediately gets my attention!
gql.tada is indeed very impressive and I think shares many of the same values as Grats. That said, I believe that today they only support the client path. Editor features and type generation for queries/mutations and fragments, although they do have interest in having a server story as well: https://github.com/0no-co/gql.tada/issues/10
Thanks for clarifying and may I say it warms my heart to see the spirit of open, enthusiastic cross-project collaboration represented in that issue thread.