Conflicting dependency on scala-java8-compat

[nafg]

It seems beta34 and later conflict with sbt-web-scalajs-bundler 0.20.0.

I get this error:

[error] stack trace is suppressed; run last update for the full output
[error] (update) found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[error] 
[error] 	* org.scala-lang.modules:scala-java8-compat_2.12:1.0.0 (early-semver) is selected over 0.8.0
[error] 	    +- org.scalablytyped.converter:sbt-converter:1.0.0-beta34 (sbtVersion=1.0, scalaVersion=2.12) (depends on 1.0.0)
[error] 	    +- com.typesafe.akka:akka-actor_2.12:2.5.17           (depends on 0.8.0)
[error] 
[error] 
[error] this can be overridden using libraryDependencySchemes or evictionErrorLevel

Which comes from sbt-web-scalajs-bundler:

sbt:project> whatDependsOn com.typesafe.akka akka-actor_2.12
[info] com.typesafe.akka:akka-actor_2.12:2.5.17 [S]
[info]   +-com.typesafe.sbt:sbt-web:1.4.4
[info]     +-com.vmunier:sbt-web-scalajs:1.1.0
[info]       +-ch.epfl.scala:sbt-web-scalajs-bundler:0.20.0
[info]         +-default:project:0.1.0-SNAPSHOT

With this plugins.sbt:

//addSbtPlugin("io.spray" % "sbt-revolver" % "0.9.1")

addSbtPlugin("org.scala-js"                % "sbt-scalajs"             % "1.8.0")
//addSbtPlugin("org.portable-scala"          % "sbt-scalajs-crossproject" % "1.1.0")
addSbtPlugin("ch.epfl.scala"               % "sbt-web-scalajs-bundler" % "0.20.0")
addSbtPlugin("org.scalablytyped.converter" % "sbt-converter"           % "1.0.0-beta34")

[oyvindberg]

Thanks for the report.

At this point sbt authors should just publish a list of which exact versions of dependencies should be used by all sbt plugins. Because if you dare upgrade a single one you'll break all the plugins which didn't upgrade.

This can be fixed by reverting the update of the dependency in this project, or by updating it for sbt-web-scalajs-bundler. Given two non-great options I prefer the latter I guess. Otherwise I'd accept a PR with a downgrade at this side too.

[nafg]

Either that or every sbt plugin should shade all its dependencies or run in its own classloader.

Don't downgrade. However long it takes, it's better to figure out the right way.

So far I've discovered that:

• akka-actor uses scala-java8-compat 1.0.0 as of 2.6.16
• sbt-web has removed akka in Remove Akka lifecycle management from sbt-web sbt/sbt-web#169 but that has not been released. In general it seems to be abandoned for over 3 years.

Then again, scalajs-bundler is pretty stagnated too. It really needs to be updated somehow.