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: config.rb
    path of file: ./repos/anyway_config/lib/anyway
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "anyway/optparse_config"
require "anyway/dynamic_config"

mo
    
      def config_name(val = nil)
        return (@explicit_config_name = val.to_s) unless val.nil?

        return @config_name if instance_variable_defined?(:@config_name)

        @config_name = explicit_config_name || build_config_name
      end