Scala.js IR error with a case class with `java.lang.Class` field: `java.io.Serializable expected but java.lang.Class found for tree of type org.scalajs.ir.Trees$Apply`

[neko-kai]

Compiler version

3.2.2 and 3.3.1-RC1-bin-20230331-7262437-NIGHTLY

Minimized code

Can't minimize so far. To reproduce execute:

git clone https://github.com/7mind/izumi.git
cd izumi
git checkout 124644fde1dea510750a71f13c47f06c657bdcf4
sbt distage-extension-logstageJS/Test/fullLinkJS

Error:

[error] file:SafeType.scala(7:18:Return): java.io.Serializable expected but java.lang.Class found for tree of type org.scalajs.ir.Trees$Apply
[error] There were 1 IR checking errors.

Expectation

Expected to work, as on Scala 2. Only happens with fullLinkJS, not with fastOptJS.

[neko-kai]

Note, the type in question is a simple case class with two fields:

final case class SafeType private[izumi] (
  tag: LightTypeTag,
  cls: Class[?],
) { ...

Removing the case modifier fixes the issue.

[sjrd]

Fix upstream here: scala-js/scala-js#4867

[sjrd]

Fixed in scala-js/scala-js#4867. It will be available with Scala.js >= 1.13.2 (when it's released), irrespective of the version of Scala 3.