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<?php


/**


* Implements hook_uninstall().


*/


function laboratory_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', 'laboratories'); 


 $nids = $query->execute();







 // Delete entities.


 if (!empty($nids)) {


   $entities = $nodeStorage->loadMultiple($nids);


   $nodeStorage->delete($entities);


 }


}