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kotlinlang

What is the best way to include a given class only in debug compiles? For example, a mock object for the purpose of `@Preview`?

<https://developer.android.com/studio/build/build-variants#sourcesets>

I was asking in here because I figured Kotlin might have the ability to conditionalize the compile for parts of the file, like in Swift:
```#if DEBUG
struct SomeView_Previews: PreviewProvider {
    …
}
#endif```
Or even a class annotation, because you often do want previews in the same file as the view itself, but it looks like that is not possible