[Feature] Support Kotlin 2

[Nillerr]

This issue aims to track the resources and steps necessary to support Kotlin 2 and the K2 compiler. The work for this effort is being performed in https://github.com/mockative/mockative/tree/kotlin-2.

Reported Issues

• kotlin 2.0 support #74
• io.mockative.NoSuchMockException: Kotlin 2.0.0-RC2 #109

Blocking issues

• KSP Common Metadata Task Fails with null for default annotation arguments google/ksp#885
• [KSP2] NPE when getting annotation arguments on non-Jvm targets google/ksp#1823

Challenges

K2 introduces Separation of common and platform sources during compilation, which may be a breaking change for Mockative.

KSP2 introduces New Multiplatform Processing Scheme

[Nillerr]

Unfortunately, it looks like the K2 compiler (and by extension Kotlin 2) will break functionality that Mockative relies on through the Separation of common and platform sources during compilation 😞...

What we can do to continue supporting mocking in Kotlin Multiplatform is by enforcing the use of a @Mockable annotation in the primary source set, which means code would be generated regardless of whether it's being tested or not. We may be able to mitigate this by introducing a Gradle plugin that can detect whether the Gradle tasks being executed contain a KotlinTest task and only generate code in that event. We might also have to ensure that the generated code is deleted whenever a KotlinTest Gradle task is not being executed, such that we don't end up including test-only code in the primary source set.

[Nillerr]

Since google/ksp#1823 appears to be a blocking issue, and the resolution to that issue is targeting Kotlin 2.1, we may not be able to support Kotlin 2+ until this issue is addressed 😞... I will investigate alternatives.

[mustafaozhan]

issue is targeting Kotlin 2.1

That hurts... 😞

I will investigate alternatives.

Hope you will find something