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namespace Drupal\onlyone\Plugin\Validation\Constraint in Allow a content type only once (Only One) 8

Classsort descending Location Description
OnlyOneConstraint src/Plugin/Validation/Constraint/OnlyOneConstraint.php Checks that Only One node for each language exists.
OnlyOneConstraintValidator src/Plugin/Validation/Constraint/OnlyOneConstraintValidator.php Validates the OnlyOne constraint.