IssueTracker

The most recent way to setup Room in a KMP project that uses Kotlin 2.0 involves defining an expect object that extends RoomDatabaseConstructor and that Room annotation processor will generate the actual implementation.

The setup works well when the @Database along with the expect object is defined in a 'common' source set but when it is defined in platform source set, say linuxX64 then Kotlin will produce the following warning:

... expect and corresponding actual are declared in the same module

The reason is that this is no longer allowed with K2 due to different compilation model, see: https://youtrack.jetbrains.com/issue/KT-55177/Deprecate-declaration-of-expect-and-actual-counterparts-of-same-class-in-one-module

The current workaround is to define Room and the constructor object in a common native source set, such as 'nativeMain' or similar.

We need to find a solution for this, Android and JVM don't have this issue since they can skip declaring the constructor object. But native targets (and JS / WASM in the future) will need the constructor mechanism.