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Is it possible to apply the KotlinX.Serialization plugin *only* to test sources (`commonTest` , `jvmTest` …)?

No. However, without any `@Serializable` annotations, plugin will not perform code transformations.

You can try to add runtime dependency to test sources only. It is not recommended, but will probably work.

For context, it's a library that doesn't use KotlinX.Serialization directly, but through the strategy pattern it may be asked to serialize elements indirectly. I'd like to create `@Serializable` classes in the library's test sources, without the exported files having any dependency on KxS.

You could also try defining your serializable classes in a separate module where you apply the plugin, then depend on that module from your test sources

There are only ~5 of these classes so that sounds overkill, but it is conceptually simple so I may end up with that