From 6d85547a9c37ac8a8eb8d8cb51745094f5550a10 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20=C5=A0pan=C4=9Bl?=
 <OndrejSpanel@users.noreply.github.com>
Date: Thu, 5 Aug 2021 13:11:47 +0200
Subject: [PATCH] Cross compile for Scala.js

---
 build.sbt           | 33 +++++++++++++++++++++------------
 project/plugins.sbt |  2 ++
 2 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/build.sbt b/build.sbt
index 1f17478..4359cbd 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,17 +1,27 @@
-ScalaModulePlugin.scalaModuleSettings
-ScalaModulePlugin.scalaModuleOsgiSettings
 
-name := "scala-async"
-scalaModuleAutomaticModuleName := Some("scala.async")
+val sharedSettings = ScalaModulePlugin.scalaModuleSettings ++ ScalaModulePlugin.scalaModuleOsgiSettings ++ Seq(
+  name := "scala-async",
+  scalaModuleAutomaticModuleName := Some("scala.async"),
 
-libraryDependencies += "org.scala-lang" % "scala-reflect" % scalaVersion.value % "provided"
-libraryDependencies += "junit" % "junit" % "4.13.2" % Test
-libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % Test
+  OsgiKeys.exportPackage := Seq(s"scala.async.*;version=${version.value}"),
 
-ScalaModulePlugin.enableOptimizer
-testOptions += Tests.Argument(TestFrameworks.JUnit, "-q", "-v", "-s")
-Test / scalacOptions ++= Seq("-Yrangepos")
-scalacOptions ++= List("-deprecation" , "-Xasync")
+  libraryDependencies += "org.scala-lang" % "scala-reflect" % scalaVersion.value % "provided",
+  libraryDependencies += "junit" % "junit" % "4.13.2" % Test,
+  libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % Test,
+
+  ScalaModulePlugin.enableOptimizer,
+  testOptions += Tests.Argument(TestFrameworks.JUnit, "-q", "-v", "-s"),
+  Test / scalacOptions ++= Seq("-Yrangepos"),
+  scalacOptions ++= List("-deprecation" , "-Xasync")
+)
+
+lazy val proj = crossProject(JSPlatform, JVMPlatform)
+  .withoutSuffixFor(JVMPlatform)
+  .crossType(CrossType.Pure)
+  .in(file("."))
+  .settings(sharedSettings)
+
+lazy val root = project.in(file(".")).settings(sharedSettings)
 
 Global / parallelExecution := false
 
@@ -41,7 +51,6 @@ pomExtra := (
     </developer>
   </developers>
   )
-OsgiKeys.exportPackage := Seq(s"scala.async.*;version=${version.value}")
 
 commands += testDeterminism
 
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 33d0107..aed2291 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1 +1,3 @@
 addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module" % "2.3.1")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.7.0")
+addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.0.0")