Use PHP attribute for constraint plugin.

templates/Plugin/_constraint/constraint.twig

@@ -4,15 +4,12 @@ declare(strict_types=1);
 
 namespace Drupal\{{ machine_name }}\Plugin\Validation\Constraint;
 
-use Symfony\Component\Validator\Constraint;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\Core\Validation\Attribute\Constraint;
+use Symfony\Component\Validator\Constraint as SymfonyConstraint;
 
 /**
  * Provides {{ plugin_label|article }} constraint.
- *
- * @Constraint(
- *   id = "{{ plugin_id }}",
- *   label = @Translation("{{ plugin_label }}", context = "Validation"),
- * )
 {% if input_type == 'entity' %}
  *
  * @see https://www.drupal.org/node/2015723.
@@ -37,7 +34,11 @@ use Symfony\Component\Validator\Constraint;
  * @see https://www.drupal.org/node/2015723
 {% endif %}
  */
-final class {{ class }} extends Constraint {
+#[Constraint(
+  id: '{{ plugin_id }}',
+  label: new TranslatableMarkup('{{ plugin_label }}', options: ['context' => 'Validation'])
+)]
+final class {{ class }} extends SymfonyConstraint {
 
   public string $message = '@todo Specify error message here.';
 

tests/functional/Generator/Plugin/_constraint/_n_deps/_entity/src/Plugin/Validation/Constraint/DeltaConstraint.php

@@ -4,19 +4,20 @@
 
 namespace Drupal\foo\Plugin\Validation\Constraint;
 
-use Symfony\Component\Validator\Constraint;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\Core\Validation\Attribute\Constraint;
+use Symfony\Component\Validator\Constraint as SymfonyConstraint;
 
 /**
  * Provides a Delta constraint.
  *
- * @Constraint(
- *   id = "FooDelta",
- *   label = @Translation("Delta", context = "Validation"),
- * )
- *
  * @see https://www.drupal.org/node/2015723.
  */
-final class DeltaConstraint extends Constraint {
+#[Constraint(
+  id: 'FooDelta',
+  label: new TranslatableMarkup('Delta', options: ['context' => 'Validation'])
+)]
+final class DeltaConstraint extends SymfonyConstraint {
 
   public string $message = '@todo Specify error message here.';
 

tests/functional/Generator/Plugin/_constraint/_n_deps/_item/src/Plugin/Validation/Constraint/BetaConstraint.php

@@ -4,16 +4,13 @@
 
 namespace Drupal\foo\Plugin\Validation\Constraint;
 
-use Symfony\Component\Validator\Constraint;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\Core\Validation\Attribute\Constraint;
+use Symfony\Component\Validator\Constraint as SymfonyConstraint;
 
 /**
  * Provides a Beta constraint.
  *
- * @Constraint(
- *   id = "FooBeta",
- *   label = @Translation("Beta", context = "Validation"),
- * )
- *
  * @DCG
  * To apply this constraint on third party field types. Implement
  * hook_field_info_alter() as follows.
@@ -25,7 +22,11 @@
  *
  * @see https://www.drupal.org/node/2015723
  */
-final class BetaConstraint extends Constraint {
+#[Constraint(
+  id: 'FooBeta',
+  label: new TranslatableMarkup('Beta', options: ['context' => 'Validation'])
+)]
+final class BetaConstraint extends SymfonyConstraint {
 
   public string $message = '@todo Specify error message here.';
 

tests/functional/Generator/Plugin/_constraint/_n_deps/_item_list/src/Plugin/Validation/Constraint/GammaConstraint.php

@@ -4,23 +4,24 @@
 
 namespace Drupal\foo\Plugin\Validation\Constraint;
 
-use Symfony\Component\Validator\Constraint;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\Core\Validation\Attribute\Constraint;
+use Symfony\Component\Validator\Constraint as SymfonyConstraint;
 
 /**
  * Provides a Gamma constraint.
  *
- * @Constraint(
- *   id = "FooGamma",
- *   label = @Translation("Gamma", context = "Validation"),
- * )
- *
  * @DCG
  * To apply this constraint on third party entity types implement either
  * hook_entity_base_field_info_alter() or hook_entity_bundle_field_info_alter().
  *
  * @see https://www.drupal.org/node/2015723
  */
-final class GammaConstraint extends Constraint {
+#[Constraint(
+  id: 'FooGamma',
+  label: new TranslatableMarkup('Gamma', options: ['context' => 'Validation'])
+)]
+final class GammaConstraint extends SymfonyConstraint {
 
   public string $message = '@todo Specify error message here.';
 

tests/functional/Generator/Plugin/_constraint/_n_deps/_raw_value/src/Plugin/Validation/Constraint/AlphaConstraint.php

@@ -4,17 +4,18 @@
 
 namespace Drupal\foo\Plugin\Validation\Constraint;
 
-use Symfony\Component\Validator\Constraint;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\Core\Validation\Attribute\Constraint;
+use Symfony\Component\Validator\Constraint as SymfonyConstraint;
 
 /**
  * Provides an Alpha constraint.
- *
- * @Constraint(
- *   id = "FooAlpha",
- *   label = @Translation("Alpha", context = "Validation"),
- * )
  */
-final class AlphaConstraint extends Constraint {
+#[Constraint(
+  id: 'FooAlpha',
+  label: new TranslatableMarkup('Alpha', options: ['context' => 'Validation'])
+)]
+final class AlphaConstraint extends SymfonyConstraint {
 
   public string $message = '@todo Specify error message here.';
 

tests/functional/Generator/Plugin/_constraint/_w_deps/_raw_value/src/Plugin/Validation/Constraint/AlphaConstraint.php

@@ -4,17 +4,18 @@
 
 namespace Drupal\foo\Plugin\Validation\Constraint;
 
-use Symfony\Component\Validator\Constraint;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\Core\Validation\Attribute\Constraint;
+use Symfony\Component\Validator\Constraint as SymfonyConstraint;
 
 /**
  * Provides an Alpha constraint.
- *
- * @Constraint(
- *   id = "FooAlpha",
- *   label = @Translation("Alpha", context = "Validation"),
- * )
  */
-final class AlphaConstraint extends Constraint {
+#[Constraint(
+  id: 'FooAlpha',
+  label: new TranslatableMarkup('Alpha', options: ['context' => 'Validation'])
+)]
+final class AlphaConstraint extends SymfonyConstraint {
 
   public string $message = '@todo Specify error message here.';