ContainerBuilder $container:
array $config:
Boolean Whether the configuration is enabled
InvalidArgumentException When the config is not enableable
protected function isConfigEnabled(ContainerBuilder $container, array $config) {
  if (!array_key_exists('enabled', $config)) {
    throw new InvalidArgumentException("The config array has no 'enabled' key.");
  }
  return (bool) $container
    ->getParameterBag()
    ->resolveValue($config['enabled']);
}