MovieDatabase.kt

@Database(entities = [Movie::class], version = 1)
@ConstructedBy(MovieDatabaseConstructor::class)
abstract class MovieDatabase: RoomDatabase() {
    abstract fun getMovieDao(): MovieDao
}

// Room compiler generates the `actual` implementations
@Suppress("NO_ACTUAL_FOR_EXPECT")
expect object MovieDatabaseConstructor : RoomDatabaseConstructor<MovieDatabase> {
    override fun initialize(): MovieDatabase
}