public FieldDefinitionInterface::getTargetEntityTypeId()
Returns the ID of the entity type the field is attached to.
This method should not be confused with EntityInterface::getEntityTypeId() (configurable fields are config entities, and thus implement both interfaces):
string The entity type ID.
public function getTargetEntityTypeId();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldDefinitionInterface.php/function/FieldDefinitionInterface::getTargetEntityTypeId/8.1.x