Android Room @TypeConverter example in Kotlin

Converters.kt

/*
    Singleton that contains all `@TypeConverter`s of the app. 
    Mark all inner converters with `@JvmStatic` so Room can use them as regular static functions
*/
object Converters {

    @TypeConverter
    @JvmStatic
    fun convertDateFrom(value: Date?): Long? = value?.time

    @TypeConverter
    @JvmStatic
    fun convertDateTo(value: Long?): Date? = value?.let(::Date)

}

DummyDatabase.kt

@Database(entities = [DummyEntity::class], version = 1)
@TypeConverters(Converters::class)
abstract class DummyDatabase : RoomDatabase() {

    abstract fun dummyDao(): DummyDao

}

where dao class ?