I don't believe there's anything really preventing the use of server-side events...

sachinraja on May 6, 2022 | parent | context | favorite | on: TRPC: End-to-end typesafe APIs made easy

I don't believe there's anything really preventing the use of server-side events. The Websocket implementation is via an adapter and special client so I think the same could be done for SSE (probably achievable in an external package too).