You can work in whatever way makes sense for you to share code. Kotlin allows you to call native code (JS/C/ObjC/Java/WASM) from Kotlin, or you can call Kotlin

You can work in whatever way makes sense for you to share code. Kotlin allows you to call native code (JS/C/ObjC/Java/WASM) from Kotlin, or you can call Kotlin functions from native code (JS/C/ObjC/Java/WASM). So you choose on what level you want to create shared code. So it is quite flexible so it is up to you on what level you want to share code. It can either be a low level library, a middle level library. And with maturing Jetpack Compose it is possible to build the whole app including UI multiplatform without leaving Kotlin.