import Foundation

// @saber.scope(App)
// @saber.cached
class UserStorage {

    /// List all registered users
    var allUsers: [User] {
        return ...
    }

    /// Registers a user and its password.
    /// Throws an exception if user's already exist.
    func register(_ user: User, password: String) throws {
        ...
    }

    /// Checks user password
    func check(id: User.Id, password: String) -> Bool {
        return ...
    }

    /// Finds user by id
    func find(id: User.Id) -> User? {
        return ...
    }
}