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<?php
/**
* Implements hook_uninstall().
*/
function achievements_uninstall() { //<-- replace “welcome” with your module machine name 
 // Load services.
 $queryFactory = \Drupal::service('entity.query');
 $nodeStorage  = \Drupal::entityManager()->getStorage('node');

 // Query all entity.
 $query = $queryFactory->get('node')
// <-- replace event in below line with your content type machine name
   ->condition('type', 'achievements'); 
 $nids = $query->execute();

 // Delete entities.
 if (!empty($nids)) {
   $entities = $nodeStorage->loadMultiple($nids);
   $nodeStorage->delete($entities);
 }
}