You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: menu.rb
    path of file: ./repos/view_components/app/components/primer/alpha/dropdown
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Primer
  module Alpha
    class Dropdown
      # This component is part of `Dropdown` and should not be
      # used as a standalone component.
      class Menu < Primer::Component
        status :alpha

        AS_DEFAULT = :default
        AS_OPTIONS = [AS_DEFAULT, :list].freeze

        SCHEME_DEFAULT = :default
        SCHEME_MAPPINGS = {
          SCHEME_DEFAULT => "
    
        def initialize(as: AS_DEFAULT, direction: DIRECTION_DEFAULT, scheme: SCHEME_DEFAULT, header: nil, **system_arguments)
          @header = header
          @direction = direction
          @as = fetch_or_fallback(AS_OPTIONS, as, AS_DEFAULT)

          @system_arguments = deny_tag_argument(**system_arguments)
          @system_arguments[:tag] = "details-menu"
          @system_arguments[:role] = "menu"

          @system_arguments[:classes] = class_names(
            @system_arguments[:classes],
            "dropdown-menu",
            "dropdown-menu-#{fetch_or_fallback(DIRECTION_OPTIONS, direction, DIRECTION_DEFAULT)}",
            SCHEME_MAPPINGS[fetch_or_fallback(SCHEME_MAPPINGS.keys, scheme, SCHEME_DEFAULT)]
          )
        end