class RuboCop::Cop::Cop

def custom_severity
  severity = cop_config['Severity']
  return unless severity
  if Severity::NAMES.include?(severity.to_sym)
    severity.to_sym
  else
    message = "Warning: Invalid severity '#{severity}'. " \
      "Valid severities are #{Severity::NAMES.join(', ')}."
    warn(Rainbow(message).red)
  end
end