farm-2.x-dev/modules/quantity/standard/src/Plugin/Quantity/QuantityType/Standard.php

<?php

namespace Drupal\farm_quantity_standard\Plugin\Quantity\QuantityType;

use Drupal\farm_entity\Plugin\Quantity\QuantityType\FarmQuantityType;

/**
 * Provides the standard quantity type.
 *
 * @QuantityType(
 *   id = "standard",
 *   label = @Translation("Standard"),
 * )
 */
class Standard extends FarmQuantityType {

}