diff --git a/idea/src/mill/idea/GenIdea.scala b/idea/src/mill/idea/GenIdea.scala
index ec961a399b5..f3f70d990b1 100644
--- a/idea/src/mill/idea/GenIdea.scala
+++ b/idea/src/mill/idea/GenIdea.scala
@@ -12,7 +12,7 @@ object GenIdea extends ExternalModule {
   def idea(allBootstrapEvaluators: Evaluator.AllBootstrapEvaluators): Command[Unit] = T.command {
     try {
       Result.Success(GenIdeaImpl(
-        evaluators = Evaluator.allBootstrapEvaluators.value.value
+        evaluators = allBootstrapEvaluators.value
       ).run())
     } catch {
       case GenIdeaImpl.GenIdeaException(m) => Result.Failure(m)
diff --git a/idea/src/mill/idea/GenIdeaImpl.scala b/idea/src/mill/idea/GenIdeaImpl.scala
index 1523f83dd87..f2d17b6bf6d 100755
--- a/idea/src/mill/idea/GenIdeaImpl.scala
+++ b/idea/src/mill/idea/GenIdeaImpl.scala
@@ -1,7 +1,7 @@
 package mill.idea
 
 import scala.collection.immutable
-import scala.util.Try
+import scala.util.{Success, Try}
 import scala.xml.{Elem, MetaData, Node, NodeSeq, Null, UnprefixedAttribute}
 import coursier.core.compatibility.xmlParseDom
 import coursier.maven.Pom
@@ -15,7 +15,6 @@ import mill.scalalib.GenIdeaModule.{IdeaConfigFile, JavaFacet}
 import mill.scalalib.internal.JavaModuleUtils
 import mill.util.Classpath
 import mill.{T, scalalib}
-import os.{Path, SubPath}
 import mill.scalalib.{GenIdeaImpl => _, _}
 
 case class GenIdeaImpl(
@@ -23,8 +22,8 @@ case class GenIdeaImpl(
 )(implicit ctx: Ctx) {
   import GenIdeaImpl._
 
-  val workDir: Path = evaluators.head.rootModule.millSourcePath
-  val ideaDir: Path = workDir / ".idea"
+  val workDir: os.Path = evaluators.head.rootModule.millSourcePath
+  val ideaDir: os.Path = workDir / ".idea"
 
   val ideaConfigVersion = 4
 
@@ -34,7 +33,7 @@ case class GenIdeaImpl(
       .getOrElse(("JDK_1_8", "1.8 (1)"))
 
     ctx.log.info("Analyzing modules ...")
-    val layout: Seq[(SubPath, Node)] =
+    val layout: Seq[(os.SubPath, Node)] =
       xmlFileLayout(evaluators, jdkInfo)
 
     ctx.log.debug("Cleaning obsolete IDEA project files ...")
@@ -102,7 +101,7 @@ case class GenIdeaImpl(
 //        .toSeq
 //        .distinct
 
-    val buildLibraryPaths: immutable.Seq[Path] = {
+    val buildLibraryPaths: immutable.Seq[os.Path] = {
       if (!fetchMillModules) Nil
       else {
         val moduleRepos = modulesByEvaluator.toSeq.flatMap { case (ev, modules) =>
@@ -197,7 +196,7 @@ case class GenIdeaImpl(
             }
 
             T.task {
-              val resolvedCp: Agg[Scoped[Path]] =
+              val resolvedCp: Agg[Scoped[os.Path]] =
                 externalDependencies().map(_.path).map(Scoped(_, None)) ++
                   extCompileIvyDeps()
                     .map(_.path)
@@ -251,14 +250,14 @@ case class GenIdeaImpl(
 
     val moduleLabels = modules.map { case (s, m, e) => (m, s) }.toMap
 
-    val allResolved: Seq[Path] =
+    val allResolved: Seq[os.Path] =
       (resolvedModules.flatMap(_.classpath).map(_.value) ++ buildLibraryPaths ++ buildDepsPaths)
         .distinct
         .sorted
 
-    val librariesProperties: Map[Path, Agg[Path]] =
+    val librariesProperties: Map[os.Path, Agg[os.Path]] =
       resolvedModules
-        .flatMap(x => x.libraryClasspath.map(_ -> x.compilerClasspath))
+        .flatMap(rm => rm.libraryClasspath.map(_ -> rm.compilerClasspath))
         .toMap
 
     val (wholeFileConfigs, configFileContributions) =
@@ -267,20 +266,20 @@ case class GenIdeaImpl(
         .partition(_.asWholeFile.isDefined)
 
     // whole file
-    val ideaWholeConfigFiles: Seq[(SubPath, Elem)] =
+    val ideaWholeConfigFiles: Seq[(os.SubPath, Elem)] =
       wholeFileConfigs.flatMap(_.asWholeFile).map { wf =>
         os.sub / wf._1 -> ideaConfigElementTemplate(wf._2)
       }
 
-    type FileComponent = (SubPath, Option[String])
+    type FileComponent = (os.SubPath, Option[String])
 
     /** Ensure, the additional configs don't collide. */
     def collisionFreeExtraConfigs(
         confs: Seq[IdeaConfigFile]
-    ): Map[SubPath, Seq[IdeaConfigFile]] = {
+    ): Map[os.SubPath, Seq[IdeaConfigFile]] = {
 
       var seen: Map[FileComponent, Seq[GenIdeaModule.Element]] = Map()
-      var result: Map[SubPath, Seq[IdeaConfigFile]] = Map()
+      var result: Map[os.SubPath, Seq[IdeaConfigFile]] = Map()
       confs.foreach { conf =>
         val key = conf.subPath -> conf.component
         seen.get(key) match {
@@ -307,7 +306,7 @@ case class GenIdeaImpl(
       result
     }
 
-    val fileComponentContributions: Seq[(SubPath, Elem)] =
+    val fileComponentContributions: Seq[(os.SubPath, Elem)] =
       collisionFreeExtraConfigs(configFileContributions).toSeq.map {
         case (file, configs) =>
           val map: Map[Option[String], Seq[GenIdeaModule.Element]] =
@@ -340,7 +339,7 @@ case class GenIdeaImpl(
     type ArtifactAndVersion = (String, String)
 
     def guessJarArtifactNameAndVersionFromPath(
-        path: Path
+        path: os.Path
     ): Option[ArtifactAndVersion] =
       Try {
         // in a local maven repo or a local Coursier repo,
@@ -444,7 +443,7 @@ case class GenIdeaImpl(
           r + (key -> (r.getOrElse(key, Vector()) :+ q.module))
       }
 
-    val fixedFiles: Seq[(SubPath, Elem)] = Seq(
+    val fixedFiles: Seq[(os.SubPath, Elem)] = Seq(
       Tuple2(os.sub / "misc.xml", miscXmlTemplate(jdkInfo)),
       Tuple2(os.sub / "scala_settings.xml", scalaSettingsTemplate()),
       Tuple2(
@@ -471,7 +470,7 @@ case class GenIdeaImpl(
       name.replaceAll("""[-.:]""", "_")
     }
 
-    val libraries: Seq[(SubPath, Elem)] =
+    val libraries: Seq[(os.SubPath, Elem)] =
       resolvedLibraries(allResolved).flatMap { resolved =>
         val names = libraryNames(resolved)
         val sources = resolved match {
@@ -481,7 +480,7 @@ case class GenIdeaImpl(
         }
         for (name <- names)
           yield {
-            val compilerCp: Agg[Path] = librariesProperties.getOrElse(resolved.path, Agg.empty)
+            val compilerCp: Agg[os.Path] = librariesProperties.getOrElse(resolved.path, Agg.empty)
             val languageLevel = name match {
               case _ if compilerCp.iterator.isEmpty => None
               case _ if name.startsWith("scala3-library_3-3.3.") => Some("Scala_3_3")
@@ -509,7 +508,7 @@ case class GenIdeaImpl(
           }
       }
 
-    val moduleFiles: Seq[(SubPath, Elem)] = resolvedModules.map {
+    val moduleFiles: Seq[(os.SubPath, Elem)] = resolvedModules.map {
       case ResolvedModule(
             path,
             resolvedDeps,
@@ -557,7 +556,7 @@ case class GenIdeaImpl(
 
         val sanizedDeps: Seq[ScopedOrd[String]] = {
           resolvedDeps
-            .map((s: Scoped[Path]) => pathToLibName(s.value) -> s.scope)
+            .map((s: Scoped[os.Path]) => pathToLibName(s.value) -> s.scope)
             .iterator
             .toSeq
             .groupBy(_._1)
@@ -727,31 +726,49 @@ case class GenIdeaImpl(
     </module>
   }
 
-  /** Try to make the file path a relative JAR URL (to PROJECT_DIR). */
+  /** Try to make the file path a relative JAR URL (to PROJECT_DIR or HOME_DIR). */
   def relativeJarUrl(path: os.Path): String = {
     // When coursier cache dir is on different logical drive than project dir
     // we can not use a relative path. See issue: https://github.com/lihaoyi/mill/issues/905
-    val relPath = relForwardPath(path, "$PROJECT_DIR$/")
+    val relPath = relForwardPath(path)
     if (path.ext == "jar") "jar://" + relPath + "!/" else "file://" + relPath
   }
 
-  /** Try to make the file path a relative URL (to PROJECT_DIR). */
-  def relativeFileUrl(path: Path): String = {
+  /** Try to make the file path a relative URL (to PROJECT_DIR or HOME_DIR). */
+  def relativeFileUrl(path: os.Path): String = {
     // When coursier cache dir is on different logical drive than project dir
     // we can not use a relative path. See issue: https://github.com/lihaoyi/mill/issues/905
-    "file://" + relForwardPath(path, "$PROJECT_DIR$/")
+    "file://" + relForwardPath(path)
   }
 
-  private def relForwardPath(path: os.Path, prefix: String): String = {
+  private val projectDir = (workDir, "$PROJECT_DIR$/")
+  private val homeDir = (os.home, "$USER_HOME$/")
+
+  private def relForwardPath(path: os.Path): String = {
+
     def forward(p: os.FilePath): String = p.toString().replace("""\""", "/")
-    Try(prefix + forward(path.relativeTo(workDir))).getOrElse(forward(path))
+
+    val relToProjectDir = Try(projectDir._2 + forward(path.relativeTo(projectDir._1)))
+    val relToHomeDir = Try(homeDir._2 + forward(path.relativeTo(homeDir._1)))
+
+    (relToProjectDir, relToHomeDir) match {
+      // We seem to be outside of project-dir but inside home dir, so use releative path to home dir
+      case (Success(p1), Success(p2)) if p1.contains("..") && !p2.contains("..") => p2
+      // default to project-dir-relative
+      case (Success(p), _) => p
+      // if that fails, use home-dir-relative, which might fix cases on Windows
+      // where the home-dir is not on the same drive as the project-dir
+      case (_, Success(p)) => p
+      // Use the absolute path
+      case _ => forward(path)
+    }
   }
 
   def libraryXmlTemplate(
       name: String,
       path: os.Path,
       sources: Option[os.Path],
-      scalaCompilerClassPath: Agg[Path],
+      scalaCompilerClassPath: Agg[os.Path],
       languageLevel: Option[String]
   ): Elem = {
     val isScalaLibrary = scalaCompilerClassPath.iterator.nonEmpty
@@ -990,15 +1007,15 @@ object GenIdeaImpl {
 
   final case class ResolvedModule(
       path: Segments,
-      classpath: Agg[Scoped[Path]],
+      classpath: Agg[Scoped[os.Path]],
       module: JavaModule,
-      pluginClasspath: Agg[Path],
+      pluginClasspath: Agg[os.Path],
       scalaOptions: Seq[String],
-      compilerClasspath: Agg[Path],
-      libraryClasspath: Agg[Path],
+      compilerClasspath: Agg[os.Path],
+      libraryClasspath: Agg[os.Path],
       facets: Seq[JavaFacet],
       configFileContributions: Seq[IdeaConfigFile],
-      compilerOutput: Path,
+      compilerOutput: os.Path,
       evaluator: Evaluator
   )
 
diff --git a/integration/feature/gen-idea/repo/extended/idea/libraries/SBT_ junit_junit_2_13_4_13_2_jar.xml b/integration/feature/gen-idea/repo/extended/idea/libraries/SBT_ junit_junit_2_13_4_13_2_jar.xml
index c6bc930b141..9e643eaf6ab 100644
--- a/integration/feature/gen-idea/repo/extended/idea/libraries/SBT_ junit_junit_2_13_4_13_2_jar.xml	
+++ b/integration/feature/gen-idea/repo/extended/idea/libraries/SBT_ junit_junit_2_13_4_13_2_jar.xml	
@@ -1,10 +1,10 @@
 <component name="libraryTable">
     <library name="SBT: junit:junit_2.13:4.13.2:jar">
         <CLASSES>
-            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/junit/junit/4.13.2/junit-4.13.2.jar!/"/>
+            <root url="jar://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/junit/junit/4.13.2/junit-4.13.2.jar!/"/>
         </CLASSES>
         <SOURCES>
-            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/junit/junit/4.13.2/junit-4.13.2-sources.jar!/"/>
+            <root url="jar://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/junit/junit/4.13.2/junit-4.13.2-sources.jar!/"/>
         </SOURCES>
     </library>
 </component>
\ No newline at end of file
diff --git a/integration/feature/gen-idea/repo/extended/idea/libraries/SBT_ org_scalameta_munit_2_13_0_7_29_jar.xml b/integration/feature/gen-idea/repo/extended/idea/libraries/SBT_ org_scalameta_munit_2_13_0_7_29_jar.xml
index 68fe9634f79..7c8b3a6a294 100644
--- a/integration/feature/gen-idea/repo/extended/idea/libraries/SBT_ org_scalameta_munit_2_13_0_7_29_jar.xml	
+++ b/integration/feature/gen-idea/repo/extended/idea/libraries/SBT_ org_scalameta_munit_2_13_0_7_29_jar.xml	
@@ -1,10 +1,10 @@
 <component name="libraryTable">
     <library name="SBT: org.scalameta:munit_2.13:0.7.29:jar">
         <CLASSES>
-            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/org/scalameta/munit_2.13/0.7.29/munit_2.13-0.7.29.jar!/"/>
+            <root url="jar://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scalameta/munit_2.13/0.7.29/munit_2.13-0.7.29.jar!/"/>
         </CLASSES>
         <SOURCES>
-            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/org/scalameta/munit_2.13/0.7.29/munit_2.13-0.7.29-sources.jar!/"/>
+            <root url="jar://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scalameta/munit_2.13/0.7.29/munit_2.13-0.7.29-sources.jar!/"/>
         </SOURCES>
     </library>
 </component>
\ No newline at end of file
diff --git a/integration/feature/gen-idea/repo/extended/idea/libraries/scala_library_2_13_6_jar.xml b/integration/feature/gen-idea/repo/extended/idea/libraries/scala_library_2_13_6_jar.xml
index 5bdcd1522ff..d69a1376af8 100644
--- a/integration/feature/gen-idea/repo/extended/idea/libraries/scala_library_2_13_6_jar.xml
+++ b/integration/feature/gen-idea/repo/extended/idea/libraries/scala_library_2_13_6_jar.xml
@@ -3,18 +3,18 @@
         <properties>
             <language-level>Scala_2_13</language-level>
             <compiler-classpath>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/net/java/dev/jna/jna/5.3.1/jna-5.3.1.jar"/>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/jline/jline/3.19.0/jline-3.19.0.jar"/>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.13.6/scala-compiler-2.13.6.jar"/>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6.jar"/>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.13.6/scala-reflect-2.13.6.jar"/>
+                <root url="file://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/net/java/dev/jna/jna/5.3.1/jna-5.3.1.jar"/>
+                <root url="file://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/jline/jline/3.19.0/jline-3.19.0.jar"/>
+                <root url="file://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.13.6/scala-compiler-2.13.6.jar"/>
+                <root url="file://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6.jar"/>
+                <root url="file://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.13.6/scala-reflect-2.13.6.jar"/>
             </compiler-classpath>
         </properties>
         <CLASSES>
-            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6.jar!/"/>
+            <root url="jar://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6.jar!/"/>
         </CLASSES>
         <SOURCES>
-            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6-sources.jar!/"/>
+            <root url="jar://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6-sources.jar!/"/>
         </SOURCES>
     </library>
 </component>
diff --git a/integration/feature/gen-idea/repo/hello-world/build.sc b/integration/feature/gen-idea/repo/hello-idea/build.sc
similarity index 81%
rename from integration/feature/gen-idea/repo/hello-world/build.sc
rename to integration/feature/gen-idea/repo/hello-idea/build.sc
index 69c1482bd75..dba62aebefb 100644
--- a/integration/feature/gen-idea/repo/hello-world/build.sc
+++ b/integration/feature/gen-idea/repo/hello-idea/build.sc
@@ -3,7 +3,7 @@ import mill.define.Target
 import mill._
 import mill.scalalib.{Dep, DepSyntax, TestModule}
 
-trait HelloWorldModule extends scalalib.ScalaModule {
+trait HelloIdeaModule extends scalalib.ScalaModule {
   def scalaVersion = "2.12.5"
   object test extends ScalaTests with TestModule.Utest {
     override def compileIvyDeps: Target[Agg[Dep]] = Agg(
@@ -20,8 +20,8 @@ trait HelloWorldModule extends scalalib.ScalaModule {
   }
 }
 
-object HelloWorld extends HelloWorldModule
+object HelloIdea extends HelloIdeaModule
 
-object HiddenWorld extends HelloWorldModule {
+object HiddenIdea extends HelloIdeaModule {
   override def skipIdea = true
 }
diff --git a/integration/feature/gen-idea/repo/hello-idea/idea/libraries/scala_library_2_12_5_jar.xml b/integration/feature/gen-idea/repo/hello-idea/idea/libraries/scala_library_2_12_5_jar.xml
new file mode 100644
index 00000000000..893b4133025
--- /dev/null
+++ b/integration/feature/gen-idea/repo/hello-idea/idea/libraries/scala_library_2_12_5_jar.xml
@@ -0,0 +1,19 @@
+<component name="libraryTable">
+    <library name="scala-library-2.12.5.jar" type="Scala">
+        <properties>
+            <language-level>Scala_2_12</language-level>
+            <compiler-classpath>
+                <root url="file://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-xml_2.12/1.0.6/scala-xml_2.12-1.0.6.jar"/>
+                <root url="file://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.12.5/scala-compiler-2.12.5.jar"/>
+                <root url="file://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.5/scala-library-2.12.5.jar"/>
+                <root url="file://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.12.5/scala-reflect-2.12.5.jar"/>
+            </compiler-classpath>
+        </properties>
+        <CLASSES>
+            <root url="jar://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.5/scala-library-2.12.5.jar!/"/>
+        </CLASSES>
+        <SOURCES>
+            <root url="jar://$USER_HOME$/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.5/scala-library-2.12.5-sources.jar!/"/>
+        </SOURCES>
+    </library>
+</component>
diff --git a/integration/feature/gen-idea/repo/hello-idea/idea/mill_modules/helloidea.iml b/integration/feature/gen-idea/repo/hello-idea/idea/mill_modules/helloidea.iml
new file mode 100644
index 00000000000..8b91460b799
--- /dev/null
+++ b/integration/feature/gen-idea/repo/hello-idea/idea/mill_modules/helloidea.iml
@@ -0,0 +1,13 @@
+<module type="JAVA_MODULE" version="4">
+    <component name="NewModuleRootManager">
+        <output url="file://$MODULE_DIR$/../../out/HelloIdea/ideaCompileOutput.dest/classes"/>
+        <exclude-output/>
+        <content url="file://$MODULE_DIR$/../../HelloIdea">
+            <sourceFolder url="file://$MODULE_DIR$/../../HelloIdea/src" isTestSource="false"/>
+            <sourceFolder url="file://$MODULE_DIR$/../../HelloIdea/resources" type="java-resource"/>
+        </content>
+        <orderEntry type="inheritedJdk"/>
+        <orderEntry type="sourceFolder" forTests="false"/>
+        <orderEntry type="library" name="scala-library-2.12.5.jar" level="project"/>
+    </component>
+</module>
\ No newline at end of file
diff --git a/integration/feature/gen-idea/repo/hello-world/idea/mill_modules/helloworld.test.iml b/integration/feature/gen-idea/repo/hello-idea/idea/mill_modules/helloidea.test.iml
similarity index 60%
rename from integration/feature/gen-idea/repo/hello-world/idea/mill_modules/helloworld.test.iml
rename to integration/feature/gen-idea/repo/hello-idea/idea/mill_modules/helloidea.test.iml
index ee320609f2f..b0920fbba37 100644
--- a/integration/feature/gen-idea/repo/hello-world/idea/mill_modules/helloworld.test.iml
+++ b/integration/feature/gen-idea/repo/hello-idea/idea/mill_modules/helloidea.test.iml
@@ -1,10 +1,10 @@
 <module type="JAVA_MODULE" version="4">
     <component name="NewModuleRootManager">
-        <output-test url="file://$MODULE_DIR$/../../out/HelloWorld/test/ideaCompileOutput.dest/classes"/>
+        <output-test url="file://$MODULE_DIR$/../../out/HelloIdea/test/ideaCompileOutput.dest/classes"/>
         <exclude-output/>
-        <content url="file://$MODULE_DIR$/../../HelloWorld/test">
-            <sourceFolder url="file://$MODULE_DIR$/../../HelloWorld/test/src" isTestSource="true"/>
-            <sourceFolder url="file://$MODULE_DIR$/../../HelloWorld/test/resources" type="java-test-resource"/>
+        <content url="file://$MODULE_DIR$/../../HelloIdea/test">
+            <sourceFolder url="file://$MODULE_DIR$/../../HelloIdea/test/src" isTestSource="true"/>
+            <sourceFolder url="file://$MODULE_DIR$/../../HelloIdea/test/resources" type="java-test-resource"/>
         </content>
         <orderEntry type="inheritedJdk"/>
         <orderEntry type="sourceFolder" forTests="false"/>
@@ -13,6 +13,6 @@
         <orderEntry type="library" name="logback-core-1.2.3.jar" level="project"/>
         <orderEntry type="library" name="scala-library-2.12.5.jar" level="project"/>
         <orderEntry type="library" name="slf4j-api-1.7.25.jar" level="project"/>
-        <orderEntry type="module" module-name="helloworld" exported=""/>
+        <orderEntry type="module" module-name="helloidea" exported=""/>
     </component>
 </module>
diff --git a/integration/feature/gen-idea/repo/hello-world/idea/mill_modules/mill-build.iml b/integration/feature/gen-idea/repo/hello-idea/idea/mill_modules/mill-build.iml
similarity index 100%
rename from integration/feature/gen-idea/repo/hello-world/idea/mill_modules/mill-build.iml
rename to integration/feature/gen-idea/repo/hello-idea/idea/mill_modules/mill-build.iml
diff --git a/integration/feature/gen-idea/repo/hello-world/idea/misc.xml b/integration/feature/gen-idea/repo/hello-idea/idea/misc.xml
similarity index 100%
rename from integration/feature/gen-idea/repo/hello-world/idea/misc.xml
rename to integration/feature/gen-idea/repo/hello-idea/idea/misc.xml
diff --git a/integration/feature/gen-idea/repo/hello-world/idea/modules.xml b/integration/feature/gen-idea/repo/hello-idea/idea/modules.xml
similarity index 69%
rename from integration/feature/gen-idea/repo/hello-world/idea/modules.xml
rename to integration/feature/gen-idea/repo/hello-idea/idea/modules.xml
index cab10e5c482..d079cc48d82 100644
--- a/integration/feature/gen-idea/repo/hello-world/idea/modules.xml
+++ b/integration/feature/gen-idea/repo/hello-idea/idea/modules.xml
@@ -1,8 +1,8 @@
 <project version="4">
     <component name="ProjectModuleManager">
         <modules>
-            <module fileurl="file://$PROJECT_DIR$/.idea/mill_modules/helloworld.iml" filepath="$PROJECT_DIR$/.idea/mill_modules/helloworld.iml"/>
-            <module fileurl="file://$PROJECT_DIR$/.idea/mill_modules/helloworld.test.iml" filepath="$PROJECT_DIR$/.idea/mill_modules/helloworld.test.iml"/>
+            <module fileurl="file://$PROJECT_DIR$/.idea/mill_modules/helloidea.iml" filepath="$PROJECT_DIR$/.idea/mill_modules/helloidea.iml"/>
+            <module fileurl="file://$PROJECT_DIR$/.idea/mill_modules/helloidea.test.iml" filepath="$PROJECT_DIR$/.idea/mill_modules/helloidea.test.iml"/>
             <module fileurl="file://$PROJECT_DIR$/.idea/mill_modules/mill-build.iml" filepath="$PROJECT_DIR$/.idea/mill_modules/mill-build.iml"/>
         </modules>
     </component>
diff --git a/integration/feature/gen-idea/repo/hello-world/idea/libraries/scala_library_2_12_5_jar.xml b/integration/feature/gen-idea/repo/hello-world/idea/libraries/scala_library_2_12_5_jar.xml
deleted file mode 100644
index f557f8fad27..00000000000
--- a/integration/feature/gen-idea/repo/hello-world/idea/libraries/scala_library_2_12_5_jar.xml
+++ /dev/null
@@ -1,19 +0,0 @@
-<component name="libraryTable">
-    <library name="scala-library-2.12.5.jar" type="Scala">
-        <properties>
-            <language-level>Scala_2_12</language-level>
-            <compiler-classpath>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-xml_2.12/1.0.6/scala-xml_2.12-1.0.6.jar"/>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.12.5/scala-compiler-2.12.5.jar"/>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.5/scala-library-2.12.5.jar"/>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.12.5/scala-reflect-2.12.5.jar"/>
-            </compiler-classpath>
-        </properties>
-        <CLASSES>
-            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.5/scala-library-2.12.5.jar!/"/>
-        </CLASSES>
-        <SOURCES>
-            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.5/scala-library-2.12.5-sources.jar!/"/>
-        </SOURCES>
-    </library>
-</component>
diff --git a/integration/feature/gen-idea/repo/hello-world/idea/mill_modules/helloworld.iml b/integration/feature/gen-idea/repo/hello-world/idea/mill_modules/helloworld.iml
deleted file mode 100644
index f3159dda104..00000000000
--- a/integration/feature/gen-idea/repo/hello-world/idea/mill_modules/helloworld.iml
+++ /dev/null
@@ -1,13 +0,0 @@
-<module type="JAVA_MODULE" version="4">
-    <component name="NewModuleRootManager">
-        <output url="file://$MODULE_DIR$/../../out/HelloWorld/ideaCompileOutput.dest/classes"/>
-        <exclude-output/>
-        <content url="file://$MODULE_DIR$/../../HelloWorld">
-            <sourceFolder url="file://$MODULE_DIR$/../../HelloWorld/src" isTestSource="false"/>
-            <sourceFolder url="file://$MODULE_DIR$/../../HelloWorld/resources" type="java-resource"/>
-        </content>
-        <orderEntry type="inheritedJdk"/>
-        <orderEntry type="sourceFolder" forTests="false"/>
-        <orderEntry type="library" name="scala-library-2.12.5.jar" level="project"/>
-    </component>
-</module>
\ No newline at end of file
diff --git a/integration/feature/gen-idea/test/src/GenIdeaExtendedTests.scala b/integration/feature/gen-idea/test/src/GenIdeaExtendedTests.scala
index 1738c9cbd65..fed9958b93e 100644
--- a/integration/feature/gen-idea/test/src/GenIdeaExtendedTests.scala
+++ b/integration/feature/gen-idea/test/src/GenIdeaExtendedTests.scala
@@ -10,31 +10,17 @@ object GenIdeaExtendedTests extends IntegrationTestSuite {
 
   override def scriptSourcePath: Path = super.scriptSourcePath / "extended"
 
-  private val scalaVersionLibPart = "2_13_6"
-
   def tests: Tests = Tests {
     "genIdeaTests" - {
       val workspacePath = initWorkspace()
+      val expectedBase = workspacePath / "idea"
+      val resources = os.walk(expectedBase).filter(os.isFile).map(_.subRelativeTo(expectedBase))
+
       eval("mill.idea.GenIdea/idea")
 
-      val checks = Seq(
-        os.sub / "mill_modules" / "helloworld.iml",
-        os.sub / "mill_modules" / "helloworld.subscala3.iml",
-        os.sub / "mill_modules" / "helloworld.test.iml",
-        os.sub / "mill_modules" / "mill-build.iml",
-        os.sub / "mill_modules" / "mill-build.mill-build.iml",
-        os.sub / "libraries" / s"scala_library_${scalaVersionLibPart}_jar.xml",
-        // NOTE: on IntelliJ Scala Plugin side there is a cosmetic issue: scala suffix is added even for Java libraries (notice `_2_13` suffix)
-        // In future it might be fixed and `GenIdea` will need to be updated
-        os.sub / "libraries" / "SBT_ junit_junit_2_13_4_13_2_jar.xml",
-        os.sub / "libraries" / "SBT_ org_scalameta_munit_2_13_0_7_29_jar.xml",
-        os.sub / "modules.xml",
-        os.sub / "misc.xml",
-        os.sub / "compiler.xml"
-      ).map { resource =>
+      val checks = resources.map { resource =>
         Try {
           GenIdeaUtils.assertIdeaXmlResourceMatchesFile(
-            scriptSlug,
             workspacePath,
             resource
           )
diff --git a/integration/feature/gen-idea/test/src/GenIdeaTests.scala b/integration/feature/gen-idea/test/src/GenIdeaTests.scala
index 6d51dbe4781..74799815d91 100644
--- a/integration/feature/gen-idea/test/src/GenIdeaTests.scala
+++ b/integration/feature/gen-idea/test/src/GenIdeaTests.scala
@@ -9,8 +9,7 @@ import os.Path
 
 object GenIdeaTests extends IntegrationTestSuite {
 
-  override def scriptSourcePath: Path = super.scriptSourcePath / "hello-world"
-  private val scalaVersionLibPart = "2_12_5"
+  override def scriptSourcePath: Path = super.scriptSourcePath / "hello-idea"
 
   def tests: Tests = Tests {
     test("helper assertPartialContentMatches works") {
@@ -54,19 +53,14 @@ object GenIdeaTests extends IntegrationTestSuite {
 
     test("genIdeaTests") {
       val workspacePath = initWorkspace()
+      val expectedBase = workspacePath / "idea"
+      val resources = os.walk(expectedBase).filter(os.isFile).map(_.subRelativeTo(expectedBase))
+
       eval("mill.idea.GenIdea/idea")
 
-      val checks = Seq(
-        os.sub / "mill_modules" / "helloworld.iml",
-        os.sub / "mill_modules" / "helloworld.test.iml",
-        os.sub / "mill_modules" / "mill-build.iml",
-        os.sub / "libraries" / s"scala_library_${scalaVersionLibPart}_jar.xml",
-        os.sub / "modules.xml",
-        os.sub / "misc.xml"
-      ).map { resource =>
+      val checks = resources.map { resource =>
         Try {
           assertIdeaXmlResourceMatchesFile(
-            scriptSlug,
             workspacePath,
             resource
           )
diff --git a/integration/feature/gen-idea/test/src/GenIdeaUtils.scala b/integration/feature/gen-idea/test/src/GenIdeaUtils.scala
index 8aeddba9f46..b7d5edaea8f 100644
--- a/integration/feature/gen-idea/test/src/GenIdeaUtils.scala
+++ b/integration/feature/gen-idea/test/src/GenIdeaUtils.scala
@@ -11,20 +11,26 @@ object GenIdeaUtils {
    * It may contain the `<!-- IGNORE -->` String, to simulate wildcard-matches.
    */
   def assertIdeaXmlResourceMatchesFile(
-      workspaceSlug: String,
       workspacePath: os.Path,
-      resource: os.RelPath
+      resource: os.SubPath
   ): Unit = {
     val expectedResourcePath = workspacePath / "idea" / resource
     val actualResourcePath = workspacePath / ".idea" / resource
 
-    val expectedResourceString = os.read.lines(expectedResourcePath).mkString("\n")
-    val actualResourceString = normaliseLibraryPaths(os.read(actualResourcePath), workspacePath)
+    val check = Try {
+      val expectedResourceString = os.read.lines(expectedResourcePath).mkString("\n")
+      val actualResourceString = normaliseLibraryPaths(os.read(actualResourcePath), workspacePath)
 
-    assertPartialContentMatches(
-      found = actualResourceString,
-      expected = expectedResourceString
+      assertPartialContentMatches(
+        found = actualResourceString,
+        expected = expectedResourceString
+      )
+    }
+    println(
+      s"Checking ${expectedResourcePath.relativeTo(workspacePath)} ... ${if (check.isSuccess) "OK"
+        else "FAILED"}"
     )
+    check.get
   }
 
   def assertPartialContentMatches(found: String, expected: String): Unit = {
diff --git a/scalajslib/src/mill/scalajslib/ScalaJSModule.scala b/scalajslib/src/mill/scalajslib/ScalaJSModule.scala
index 768c617e246..f609c3d110e 100644
--- a/scalajslib/src/mill/scalajslib/ScalaJSModule.scala
+++ b/scalajslib/src/mill/scalajslib/ScalaJSModule.scala
@@ -17,8 +17,6 @@ trait ScalaJSModule extends scalalib.ScalaModule { outer =>
 
   def scalaJSVersion: T[String]
 
-  @deprecated("use ScalaJSTests", "0.11.0")
-  type ScalaJSModuleTests = ScalaJSTests
   trait ScalaJSTests extends ScalaTests with TestScalaJSModule {
     override def scalaJSVersion = outer.scalaJSVersion()
     override def moduleKind: Target[ModuleKind] = outer.moduleKind()
@@ -27,6 +25,10 @@ trait ScalaJSModule extends scalalib.ScalaModule { outer =>
     override def jsEnvConfig: Target[JsEnvConfig] = outer.jsEnvConfig()
     override def scalaJSOptimizer: Target[Boolean] = outer.scalaJSOptimizer()
   }
+  @deprecated("use ScalaJSTests", "0.11.0")
+  type ScalaJSModuleTests = ScalaJSTests
+  @deprecated("use ScalaJSTests", "0.11.0")
+  trait Tests extends ScalaJSTests
 
   def scalaJSBinaryVersion = T { ZincWorkerUtil.scalaJSBinaryVersion(scalaJSVersion()) }