image_field_config_delete

image_field_config_delete(FieldConfigInterface $field)

function image_field_config_delete(FieldConfigInterface $field) {
  $field_storage = $field->getFieldStorageDefinition();
  if ($field_storage->getType() != 'image') {
    // Only act on image fields.
    return;
  }

  // The value of a managed_file element can be an array if #extended == TRUE.
  $uuid = $field->getSetting('default_image')['uuid'];

  // Remove the default image when the instance is deleted.
  if ($uuid && ($file = \Drupal::entityManager()->loadEntityByUuid('file', $uuid))) {
    \Drupal::service('file.usage')->delete($file, 'image', 'default_image', $field->uuid());
  }
}