sealed class Result<T> {
  data class Success<T>(val data: T) : Result<T>()
  data class Unauthorized(val exception: Exception) : Result<Nothing>()
  data class Timeout(val exception: Exception) : Result<Nothing>()
  data class Error(val exception: Exception) : Result<Nothing>()
}

fun <A, B> Result<A>.map(mapper: (A) -> B): Result<out B> {
  return when (this) {
    is Success -> Success(mapper(data))
    is Unauthorized -> Unauthorized(exception)
    is Timeout -> Timeout(exception)
    is Error -> Error(exception)
  }
}