outline-8.x-1.x-dev/tests/modules/outline_crud/outline_crud.module

<?php

/**
 * @file
 * Provides hook implementations for testing purposes.
 */

use Drupal\outline\OutlineInterface;

/**
 * Implements hook_ENTITY_TYPE_presave() for outline entities.
 *
 * @param \Drupal\outline\OutlineInterface $outline
 */
function outline_crud_outline_presave(OutlineInterface $outline) {
  $outline->setThirdPartySetting('outline_crud', 'foo', 'bar');
}