example.rb

module ChatApp
  VERSION = "1" # String

  class User
    attr_reader :login, :email, :friends # String, String, Array[User | Bot]

    def initialize(login, email) # String, String -> void
      @login = login
      @email = email
    end
    
    def reply(from, message) # User | Bot, String -> Message
    end
  end
end