Are there any plans to support module-wide sealed classes?

In 1.5. You can enable it experimentally in 1.4. https://blog.jetbrains.com/kotlin/2021/02/new-language-features-preview-in-kotlin-1-4-30/#sealed-interfaces

yup, package-wide works great, it's a welcome addition in some cases but module wide would come in handy sometimes too, or maybe like Java does it, with specifying all the sub classes..

What is your usecase for module-wide sealed inheritors?

or maybe like Java does it, with specifying all the sub classes

This never happens because of at least two reasons: - too much useless verbosity -

expect sealed

classes can't work in such scheme, because it's allowed to add new inheritors only for

actual sealed

class

it was mostly a very large class hierarchy with lots of code in each class... having everything in one package is definitely doable, but it would be maybe a bit better to be able to organise it in a package hierarchy being able to have sealed classes in separate files does the job in 99% of the cases...