/**
 * Implements hook_ENTITY_TYPE_revision_delete().
 */
function {{ machine_name }}_ENTITY_TYPE_revision_delete(Drupal\Core\Entity\EntityInterface $entity) {
  $referenced_files_by_field = _editor_get_file_uuids_by_field($entity);
  foreach ($referenced_files_by_field as $field => $uuids) {
    _editor_delete_file_usage($uuids, $entity, 1);
  }
}