public EntityTypeInterface::setConstraints(array $constraints)
Sets the array of validation constraints for the FieldItemList.
NOTE: This will overwrite any previously set constraints. In most cases ContentEntityTypeInterface::addConstraint() should be used instead. See \Drupal\Core\TypedData\DataDefinitionInterface::getConstraints() for details on how constraints are defined.
array $constraints: An array of validation constraint definitions, keyed by constraint name. Each constraint definition can be used for instantiating \Symfony\Component\Validator\Constraint objects.
$this
\Symfony\Component\Validator\Constraint
public function setConstraints(array $constraints);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityTypeInterface.php/function/EntityTypeInterface::setConstraints/8.1.x