Sample for multiple files

test1.kt

@Target(FUNCTION, PROPERTY_GETTER, PROPERTY_SETTER)
@Retention(RUNTIME)
annotation class SomeAnnotation(
  val value: String
)

test2.kt

class SomeCustomAdapterFactory(
  private val registration: MutableMap<Int, String> = mutableMapOf()
) : CallAdapter.Factory() {

  private fun isAnnotated(annotations: Array<Annotation>): SomeAnnotation? {
    for (annotation in annotations) {
      if (SomeAnnotation::class == annotation.annotationClass) return annotation as SomeAnnotation
    }
    return null
  }