Use sbt-coursier to circumvent suspicious version selection in plugins

Author: alexarchambault

.travis.yml

@@ -2,6 +2,7 @@ language: scala
 sudo: required
 dist: trusty
 script:
+  - if [[ ${SCALAJS_VERSION} = 1.* ]]; then mv project/ScalaJS1Settings.scala.0 project/ScalaJS1Settings.scala; fi
   # plz is like ++ except it skips projects that are not defined for that scala version.
   - sbt "plz $TRAVIS_SCALA_VERSION test"
 jdk:

build.sbt

@@ -66,8 +66,7 @@ lazy val sourcecode = crossProject(JSPlatform, JVMPlatform, NativePlatform)
   )
   .enablePlugins(SbtOsgi)
   .jsSettings(
-    scalaJSUseMainModuleInitializer in Test := true, // use JVM-style main.
-    scalaJSUseTestModuleInitializer in Test := false // seems required with scala-js 1.0.0-M5
+    scalaJSUseMainModuleInitializer in Test := true // use JVM-style main.
   )
   .nativeSettings(
     crossScalaVersions := Seq(scala211)

project/ScalaJS1Settings.scala.0

@@ -0,0 +1,9 @@
+import sbt._
+object ScalaJS1Settings extends AutoPlugin {
+  override def requires = org.scalajs.sbtplugin.ScalaJSPlugin
+  override def trigger = allRequirements
+  override def projectSettings = Seq(
+    // seems required with scala-js 1.0.0-M5
+    org.scalajs.sbtplugin.ScalaJSPlugin.autoImport.scalaJSUseTestModuleInitializer in Test := false
+  )
+}

project/build.sbt

@@ -9,3 +9,5 @@ addSbtPlugin("com.typesafe.sbt" % "sbt-osgi" % "0.8.0")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "0.6.0")
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.3.8")
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "0.6.0")
+
+addSbtCoursier

project/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.0.3")