Delete all entities of a bundle type

DeleteEntitiesController.php

<?php

namespace Drupal\rest_import\Controller;

use Drupal\Core\Controller\ControllerBase;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Drupal\Core\Entity\Query\QueryFactory;
use Drupal\Core\Entity\EntityTypeManager;

/**
 * Class DeleteEntitiesController.
 *
 * @package Drupal\rest_import\Controller
 */
class DeleteEntitiesController extends ControllerBase {

  /**
   * Drupal\Core\Entity\Query\QueryFactory definition.
   *
   * @var \Drupal\Core\Entity\Query\QueryFactory
   */
  protected $entityQuery;

  /**
   * Drupal\Core\Entity\EntityTypeManager definition.
   *
   * @var \Drupal\Core\Entity\EntityTypeManager
   */
  protected $entityTypeManager;

  /**
   * {@inheritdoc}
   */
  public function __construct(QueryFactory $entity_query, EntityTypeManager $entity_type_manager) {
    $this->entityQuery = $entity_query;
    $this->entityTypeManager = $entity_type_manager;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('entity.query'),
      $container->get('entity_type.manager')
    );
  }

  /**
   * Deletes all entities from a bundle type.
   *
   * @return string
   *   Return markup.
   */
  public function deleteEntities($entity_type, $entity_bundle) {
    $query = $this->entityQuery->get($entity_type);
    switch($entity_type) {
      case 'node':
        $query->condition('type', $entity_bundle);
        break;
      case 'taxonomy_term':
        $query->condition('vid', $entity_bundle);
        break;
    }
    $ids = $query->execute();
    $storage = $this->entityTypeManager()->getStorage($entity_type);
    $entities = $storage->loadMultiple($ids);
    $storage->delete($entities);

    return [
      '#type' => 'markup',
      '#markup' => $this->t('Delete entities with parameter(s): $entity_type, $entity_bundle'),
    ];
  }

}

entity_helpers.routing.yml

entity_helpers.controller_deleteEntities:
  path: '/admin/entity_helpers/delete/{entity_type}/{entity_bundle}'
  defaults:
    _controller: '\Drupal\entity_helpers\Controller\DeleteController::deleteEntities'
    _title: 'Delete entities'
  requirements:
    _permission: 'administer content'