The class used to represent the entity type.
It must implement \Drupal\Core\Entity\EntityTypeInterface.
Type: string
public $entity_type_class = 'Drupal\Core\Entity\EntityType';
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Annotation!EntityType.php/property/EntityType::entity_type_class/8.1.x