dashboards-8.x-1.0-beta10/dashboards.install

<?php

/**
 * @file
 * Install, update, and uninstall functions for dashboards.module.
 */

/**
 * Implements hook_uninstall().
 */
function dashboards_uninstall() {
  /** @var \Drupal\user\UserDataInterface $userData */
  $userData = \Drupal::service('user.data');
  $userData->delete('dashboards');

  /** @var \Drupal\Core\Entity\EntityTypeManagerInterface $manager */
  $manager = \Drupal::service('entity_type.manager');
  $boards = $manager->getStorage('dashboard')->loadMultiple();
  $manager->getStorage('dashboard')->delete($boards);
}