Monix: Version 2.2.4, Bug Fixes, Upgraded Scala.js

Version 2.2.4 is out now.

It is a minor release that’s binary and source compatible with 2.2.x, fixing a bugs and upgrading Scala.js:

  • Bug #338: Fix broken test that can yield errors in Scala’s community build
  • Bug #333: Observable.firstStartedOf fails due to off-by-one error
  • Bug #335: Observable concatMap / mapTask trigger invalid state warning on raiseError children


  • Issue #334: Add CompositeCancelable.getAndResetTo, needed for the new firstStartedOf implementation
  • Upgrade Scala.js to latest version 0.6.15, handing deprecation warnings in TaskApp

Upgrade should be safe, being binary compatible with all previous 2.2.x versions.


To use the new version, include this in your build.sbt (and use %%% for Scala.js):

libraryDependencies += "io.monix" %% "monix" % "2.2.4"

The other projects from the @Monix organization have also been upgraded to depend on this new version.

shade, the Scala Memcached client:

dependencies += "io.monix" %% "shade" % "1.9.4"

monix-kafka, the Apache Kafka integration:

// For Kafka 8
libraryDependencies += "io.monix" %% "monix-kafka-8" % "0.13"

// For Kafka 9
libraryDependencies += "io.monix" %% "monix-kafka-9" % "0.13"

// For Kafka 10
libraryDependencies += "io.monix" %% "monix-kafka-10" % "0.13"



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