Medium article - KMM

ResultCast.swift

static func createReservation() -> Future<Void, Error> {
    return Future() { promise in
        manager.createReservation() { data, error in
            if let success = data as? ReservationsManagerReservationResultSuccess {
                promise(Result.success(()))
            } else if let error = data as? ReservationsManagerReservationResultError {
                promise(Result.failure(error.toAppError()))
            }
        }
    }
}