class RuboCop::Cop::PreferredDelimiters

def preferred_delimiters
  @preferred_delimiters ||=
    begin
      ensure_valid_preferred_delimiters
      if preferred_delimiters_config.key?('default')
        PERCENT_LITERAL_TYPES.to_h do |type|
          [type, preferred_delimiters_config[type] || preferred_delimiters_config['default']]
        end
      else
        preferred_delimiters_config
      end
    end
end