All classes that implement WebformElementAssetInterface in Webform 6.x
- class \Drupal\webform_options_custom\Plugin\WebformElement\WebformOptionsCustom implements WebformElementAssetInterface, WebformOptionsCustomInterface
- class \Drupal\webform_options_custom\Plugin\WebformElement\WebformOptionsCustomEntity implements WebformElementEntityOptionsInterface uses WebformEntityOptionsTrait, WebformEntityReferenceTrait