kotlinx serialization is doing some weird name mangling when

Question

kotlinx serialization is doing some weird name mangling when stringifying to JSON `JSON stringify UserRegistrationRequest Jonathan ` Outputs ``` user name Jonathan message name fojwga$ 0 user request SENDER SIDE x0f2y$ 0 name$ CLIENT ordinal$ 1 ``` Where `UserRegistrationRequest` is ``` Serializable class UserRegistrationRequest val user name String SpyfallMessage override val message name = Companion message name Overrides from interface SpyfallMessage override val SENDER SIDE = Side CLIENT Overrides from interface SpyfallMessage companion object const val message name = user request ```

jonathan · Answer

Context These exist in a Kotlin Multiplatform Common gradle project and act as messages that are sent between the frontend Multiplatform JS and backend Multiplatform Java via WebSockets using JSON

jonathan · Answer

The weird overriding value rather than just subclassing an implementation and passing those as constructor parameters is used because kotlinx serialization + subclassing doesn t play nicely with JS

jonathan · Answer

Finally they re deserialized to an intermediate class SpyfallMessageImpl that s just a tiny data class that accepts `message name` and `SENDER SIDE` as parameters which then allows me to further deserialize into the various subclasses manually it s basically a very long `when` statement which means that this name mangling causes deserialization to fail

sandwwraith · Answer

Looks just a little bug in a plugin which passes to the runtime mangled names instead of source names Afaik names are mangled when they re overrides or non public

jonathan · Answer

Interesting is there a way to get around this Or will I just have to remove the overrides and just re implement `message name` and `SENDER SIDE` in every subclass That latter workaround doesn t feel in the spirit of OOP

sandwwraith · Answer

Try to specify ` SerialName` on fields It will also help you to follow code style conventions for field names

sandwwraith · Answer

By the way I can t reproduce your issue Do you use plugin `v0 4` and higher

jonathan · Answer

Awesome thanks I ll try that and get back to you I m using 0 4 1 This particular example is serialized from the JS module

sandwwraith · Answer

Ah I ve solved the case Serialization works correctly but you ve accidentally imported `kotlin js JSON` instead `kotlinx serialization json JSON`

sandwwraith · Answer

The former works incorrectly in your case because it just dumps runtime JS object representation into string

jonathan · Answer

Oh whoops That makes total sense Thank you so much