We had some issues with actual existing multiplatform solutions like Flutter, React, KMM, ...

Our main issues was : Debugging, performance and memory management.

To solve those issues, I have built another way to do common code between Android and iOS.
The solution is a transpiler that transform Kotlin code to Swift code.
Solution is write in Kotlin

The solution is in 4 parts :

-> Some classes, extensions and annotations for Kotlin side.

-> Some hand made Swift classes and extensions for Swift (Things I don't manage to transpile)

-> A transpiler that transform Kotlin code to Swif code

-> A gradle plugin that :

=> Use the transpiler to transform the Kotlin code and unit tests to Swift code and unit tests

=> Validate the generated Swift code and launch the units tests transpiled in Swift to assure that produced Swift code have the same behavior as Kotlin one