I noticed that androidx annotations is still an android-only library. With Compose and Datastore being experimentally KMM, is there any plan to move annotations over? This would help with models that I want to keep in commonMain, but may need annotations such as Keep (I need to access one model class via reflection in one project). Some, such as Discouraged, AnyThread, DoNotInline, ReturnThis, etc. may even be meaningful or useful in shared code.

https://maven.google.com/web/m_index.html#androidx.annotation:annotation:1.4.0 is a JVM library, not Android-only

Good to know that it is also available on the JVM. I wonder what the reason was for not making it available on others as well? For some (especially reflection-related), it makes sense that they are only useful on JVM, but sometimes I still need shared code classes to behave a certain way on the JVM, but a no-op on other platforms is fine. Some are also fully meaningful on other platforms.

all the amdroidx annotations were written in Java

I see. Changing it to Kotlin doesn't seem like it would be too hard, but I can also see that there are more important things for the androidx team to work on.

I am not 100% sure if it'll work with Android Lint, but it should work with reflection and r8

That's interesting. I'll do that.

I can confirm that expect/actual works i did this for Parcelize annotation. You can check https://ankushg.com/posts/multiplatform-parcelize/