A modern programming language that makes developers happier.

kotlinlang

I’m trying to enable minification on Android but I’m still getting `Serializer for class 'b' is not found` at runtime. I’ve added the ProGuard rules from here, substituting my app package name:
<https://github.com/Kotlin/kotlinx.serialization#android>

Is there any other step? Or something I’m missing?

I’ve been using Kotlin serialization plugin v `1.5.31`. I tried upgrading to `1.6.0-RC`, this made no difference

I have not otherwise made any configuration to proguard besides the default Android Studio provides

if you use the reified extension functions `StringFormat.encodeToString(value)`, `StringFormat.decodeFromString()`, similar on `BinaryFormat`, `SerializersModule { polymorphic(..) { subclass(kclass) } }` they use reflection to find the serializer.
if you instead use the member functions `StringFormat.encodeToString(serializer, value)`, `StringFormat.decodeFromString(serializer)`, etc. and pass in the serializer statically (e.g.`MyType.serializer()`, not `MyType::class.serializer()`) then no reflection is used, and Proguard should keep everything necessary because it's all referenced directly

Oof, I use `encodeToString(value)` / `decodeFromString(value)`extensively

in theory the reified helpers should not require reflection, but currently that's how it works until further compiler changes are made <https://github.com/Kotlin/kotlinx.serialization/issues/1348>

It might be because your serialization plugin and kotlin versions don't match.

I did not realize they were tracked the same

<@U2VU05RC4> I did a quick check to see if matching the versions made a difference; it did not for me