public EntityTypeInterface::addConstraint($constraint_name, $options = NULL)
Adds a validation constraint.
See \Drupal\Core\TypedData\DataDefinitionInterface::getConstraints() for details on how constraints are defined.
string $constraint_name: The name of the constraint to add, i.e. its plugin id.
array|null $options: The constraint options as required by the constraint plugin, or NULL.
$this
public function addConstraint($constraint_name, $options = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityTypeInterface.php/function/EntityTypeInterface::addConstraint/8.1.x