How to optionally add a compiler plugin in SBT - scala

Question

I have a project which depends on https://github.com/typelevel/kind-projector and is currently cross-compiled against scala 2.12 and 2.13, and I want to add support for scala 3.0. However, kind-projector is not available on scala 3.0 since the syntax it enables is part of the native scala 3 syntax.
Before, I used this setting to add the compiler plugin:
addCompilerPlugin("org.typelevel" % "kind-projector" % "0.11.3" cross CrossVersion.full)
Now, I'm trying to disable that setting if the scalaVersion is 3.0.0.
The closest I've got is
Def.setting {
scalaVersion.value match {
case "3.0.0" => new Def.SettingList(Nil)
case _ => Seq(
addCompilerPlugin("org.typelevel" % "kind-projector" % "0.11.3" cross CrossVersion.full)
)
}
}
but the types don't work out (that's an Initialize but it needs to be a Setting).
How can I conditionally disable the compiler plugin based on the scala version?

Answer 1

addCompilerPlugin is a shortcut for libraryDependencies += compilerPlugin(dependency)
Thus, it should work with something like this
libraryDependencies ++= {
scalaVersion.value match {
case "3.0.0" =>
Nil
case _ =>
List(compilerPlugin("org.typelevel" % "kind-projector" % "0.11.3" cross CrossVersion.full))
}
}
There might be a better way to do it though.
Original answer which doesn't work because scalaVersion.value is not available in this context:
scalaVersion.value match {
case "3.0.0" =>
new Def.SettingList(Nil)
case _ =>
addCompilerPlugin("org.typelevel" % "kind-projector" % "0.11.3" cross CrossVersion.full)
}