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scalasbtscala.jssbt-assembly

Scala.js cross-project wrong dependency

In my build.sbt I have a cross-project (js + jvm), and I depend on the jvm part in my other project (let’s call it events). Here’s the part of my build.sbt:

lazy val common = (crossProject in file(“common”)).enablePlugins(ScalaJSPlugin)
lazy val common_js = common.js
lazy val common_jvm = common.jvm
lazy val events = (project in file (“events)).dependsOn(common_jvm)

But this setup fails when I do sbt events/assembly. The error is as follows:

java.lang.RuntimeException: deduplicate: different file contents found in the following:
JS_DEPENDENCIES
/Users/riakovle/.coursier/cache/v1/https/repo1.maven.org/maven2/org/scala-js/scalajs-library_2.11/0.6.13/scalajs-library_2.11-0.6.13.jar:JS_DEPENDENCIES

If I do the dependencyGraph, I see my events project depends on common:common_sjs0.6_2.11:0.1-SNAPSHOT, and the aforementioned scalajs-library comes transitively from it. So it seems my common js dependency creeps in somehow, even though I haven't specified it. What am I doing wrong?

Solution

  • You are probably specifying the ScalaJSPlugin on the JVM project, either directly or via crossProject. The plugin is only needed when creating a regular SBT project, as crossProject includes it automatically for the JS subproject.