Add condition preventing errors on 3.0.0. Add scripted test for running doc on Scala.js project

main/src/main/scala/sbt/Defaults.scala

@@ -2107,7 +2107,11 @@ object Defaults extends BuildCommon {
           val projectName = name.value
           if (ScalaArtifacts.isScala3(sv)) {
             val project = if (config == Compile) projectName else s"$projectName-$config"
-            compileOptions ++ Seq("-project", project)
+            if (scalaVersion.value.startsWith("3.0.0")) {
+              Seq("-project", project)
+            } else {
+              compileOptions ++ Seq("-project", project)
+            }
           } else compileOptions
         },
         (TaskZero / key) := {

sbt-app/src/sbt-test/plugins/doc-scala3-js/build.sbt

@@ -0,0 +1,12 @@
+val scala3Version = "3.0.1-RC1-bin-20210525-8f3fdf5-NIGHTLY"
+
+enablePlugins(ScalaJSPlugin)
+
+lazy val root = project
+  .in(file("."))
+  .settings(
+    name := "scala3-simple",
+    version := "0.1.0",
+
+    scalaVersion := scala3Version,
+  )

sbt-app/src/sbt-test/plugins/doc-scala3-js/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.5.1")

sbt-app/src/sbt-test/plugins/doc-scala3-js/src/main/scala/test.scala

@@ -0,0 +1,21 @@
+package test
+
+import scala.scalajs.js
+
+final case class RouteLocation(loc: String, state: js.UndefOr[js.Any])
+
+
+object RouteLocation:
+  def apply(loc: String): RouteLocation = RouteLocation(loc, js.undefined)
+  
+/**
+  * ```scala sc:compile
+  * import scala.scalajs.js
+  * final case class RouteLocation(loc: String, state: js.UndefOr[js.Any])
+  *
+  *
+  * object RouteLocation:
+  *   def apply(loc: String): RouteLocation = RouteLocation(loc, js.undefined)
+  * ```
+  */
+case class Test(s: String)

sbt-app/src/sbt-test/plugins/doc-scala3-js/test

@@ -0,0 +1 @@
+> doc