All classes that implement WebformElementAssetInterface in Webform 8.5
- class \Drupal\webform_options_custom\Plugin\WebformElement\WebformOptionsCustom implements WebformElementAssetInterface, WebformOptionsCustomInterface
- class \Drupal\webform_options_custom\Plugin\WebformElement\WebformOptionsCustomEntity implements WebformElementEntityOptionsInterface uses WebformEntityOptionsTrait, WebformEntityReferenceTrait