How to use Kotlin with Proguard

Question

I\'m trying to add Kotlin to my project and I need to use proguard. Which rules should I add to proguard to support Kotlin?

Thank you

Answer 1

In Kotlin 1.0.2 EAP proguard strips out when mappings for enums, so I have to keep them explicitly, so

-keepclassmembers class **$WhenMappings {
    ;
}

is sufficient for correct obfuscation. Although if you want some performance improvements, you can also add

-assumenosideeffects class kotlin.jvm.internal.Intrinsics {
    static void checkParameterIsNotNull(java.lang.Object, java.lang.String);
}