The best part of working on River has been actually getting good at the insane type system TS has Just wrote this type entirely off the top of my head to get full type safety on a server side caller using the builder pattern to get proper type narrowing The generics system in TS is genuinely incredible, you can do so much insane stuff with this (including heavily lie to typescript with crazy proxy bullshit which I'm doing a lot)

The end result is now you can start a durable stream in the background server side and just grab it's results whenever. Gonna be so good once I finish this in a bit (need to update all the providers and do the caller implementation lol)