Prepare build.sbt for Scala.js support

Author: OlivierBlanvillain

build.sbt

@@ -1,14 +1,7 @@
 import com.typesafe.tools.mima.plugin.{MimaPlugin, MimaKeys}
 
-scalaModuleSettings
-
-name                       := "scala-xml"
-
-version                    := "1.0.6-SNAPSHOT"
-
-scalaVersion               := crossScalaVersions.value.head
-
-crossScalaVersions         := {
+scalaVersion       in ThisBuild := crossScalaVersions.value.head
+crossScalaVersions in ThisBuild := {
   val java = System.getProperty("java.version")
   if (java.startsWith("1.6.") || java.startsWith("1.7."))
     Seq("2.11.8")
@@ -18,22 +11,26 @@ crossScalaVersions         := {
     sys.error(s"don't know what Scala versions to build on $java")
 }
 
-//reenable -Xfatal-warnings?
-scalacOptions             ++= "-deprecation:false -feature -Xlint:-stars-align,-nullary-unit,_".split("\\s+").to[Seq]
-
-scalacOptions in Test      += "-Xxml:coalescing"
-
-// important!! must come here (why?)
-scalaModuleOsgiSettings
-
-OsgiKeys.exportPackage := Seq(s"scala.xml.*;version=${version.value}")
-
-libraryDependencies += "junit" % "junit" % "4.11" % "test"
-
-libraryDependencies += "com.novocode" % "junit-interface" % "0.10" % "test"
-
-//// testing:
-// used in CompilerErrors test
-libraryDependencies += ("org.scala-lang" % "scala-compiler" % scalaVersion.value % "test").exclude("org.scala-lang.modules", s"scala-xml*")
-
-mimaPreviousVersion := Some("1.0.5")
+lazy val root = project.in(file("."))
+  .aggregate(xmlJS, xmlJVM)
+
+lazy val xml = crossProject
+  .crossType(CrossType.Full)
+  .settings(
+    name    := "scala-xml",
+    version := "1.0.6-SNAPSHOT",
+    scalacOptions         ++= "-deprecation:false -feature -Xlint:-stars-align,-nullary-unit,_".split("\\s+").to[Seq],
+    scalacOptions in Test  += "-Xxml:coalescing")
+  .jvmSettings(
+    scalaModuleSettings ++
+    scalaModuleOsgiSettings ++
+    List(
+      OsgiKeys.exportPackage := Seq(s"scala.xml.*;version=${version.value}"),
+      libraryDependencies += "junit" % "junit" % "4.11" % "test",
+      libraryDependencies += "com.novocode" % "junit-interface" % "0.10" % "test",
+      libraryDependencies += ("org.scala-lang" % "scala-compiler" % scalaVersion.value % "test").exclude("org.scala-lang.modules", s"scala-xml*"),
+      mimaPreviousVersion := Some("1.0.5")): _*)
+  .jsConfigure(_.enablePlugins(ScalaJSJUnitPlugin))
+
+lazy val xmlJVM = xml.jvm
+lazy val xmlJS = xml.js

project/plugins.sbt

@@ -1 +1,4 @@
 addSbtPlugin("org.scala-lang.modules" % "scala-module-plugin" % "1.0.4")
+
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.12")
+