This release introduces a brand new feature: brokerless service to service eventing.
This new feature allows a Kalix service to consume events producer by another, separately deployed, Kalix service without having to introduce a message broker in-between.
Note that there is no example or doc section for this yet, so for reference you will have to look at the Java/Scala section: Service to Service Eventing :: Kalix Documentation
The release also contains a number of smaller improvements, for the full list see: Release Kalix Javascript/Typescript SDK 1.0.4 · lightbend/kalix-javascript-sdk · GitHub