Add companion object to existing class

[VapidLinus]

Is it possible to add a companion object to an existing class - i.e. a class that was written manually and not with KotlinPoet?

I've seen in the docs that it's possible to add a companion object to a generated class but it doesn't mention if it's possible to attach to an existing one.

kotlinx.serialization has some way of adding generating a companion object with its @Serializable attribute and I want to achieve something similar.

[ZacSweers]

No, kotlinpoet is for generating new source files, not IR transformations (which is what kotlinx-serialization leverages).

[VapidLinus]

Thanks for the answer and for pointing me in the right direction. I'll look into IR transformations as a solution to my approach!