public function getConfigurableOptions()
{
$resolver = new OptionsResolver();
$resolver->setDefaults(['directory' => 'features', 'align' => null]);
$resolver->addAllowedTypes('directory', ['string']);
$resolver->addAllowedTypes('align', ['null', 'string']);
$resolver->addAllowedValues('align', [null, 'left', 'right']);
return $resolver;
}