opaque-user.scala

case class User(id: User.Id, firstName: User.FirstName, lastName: User.LastName, email: User.Email)

object User {
  opaque type Id = Long

  object Id {
    def apply(value: Long): Id = value
    implicit class Ops(val self: Id) extends AnyVal {
      def value: Long = self
    }
  }

  opaque type FirstName = String

  object FirstName {
    def apply(value: String): FirstName = value
    implicit class Ops(val self: FirstName) extends AnyVal {
      def value: String = self
    }
  }

  opaque type LastName = String

  object LastName {
    def apply(value: String): LastName = value
    implicit class Ops(val self: LastName) extends AnyVal {
      def value: String = self
    }
  }

  opaque type Email = String

  object Email {
    def apply(value: String): Email = value
    implicit class Ops(val self: Email) extends AnyVal {
      def value: String = self
    }
  }
}