edlp_d8/core/lib/Drupal/Core/Entity/EntityDisplayPluginCollection.php

<?php

namespace Drupal\Core\Entity;

use Drupal\Core\Plugin\DefaultLazyPluginCollection;

/**
 * A collection of formatters or widgets.
 */
class EntityDisplayPluginCollection extends DefaultLazyPluginCollection {

  /**
   * The key within the plugin configuration that contains the plugin ID.
   *
   * @var string
   */
  protected $pluginKey = 'type';

}