Issue #3436391 by mondrake: Fix return typehinting for Validator related classes

core/lib/Drupal/Core/Config/Plugin/Validation/Constraint/ConfigExistsConstraintValidator.php

@@ -42,7 +42,7 @@ class ConfigExistsConstraintValidator extends ConstraintValidator implements Con
   /**
    * {@inheritdoc}
    */
-  public function validate(mixed $name, Constraint $constraint) {
+  public function validate(mixed $name, Constraint $constraint): void {
     assert($constraint instanceof ConfigExistsConstraint);
 
     // This constraint may be used to validate nullable (optional) values.

core/lib/Drupal/Core/Config/Plugin/Validation/Constraint/RequiredConfigDependenciesConstraintValidator.php

@@ -48,7 +48,7 @@ class RequiredConfigDependenciesConstraintValidator extends ConstraintValidator
   /**
    * {@inheritdoc}
    */
-  public function validate(mixed $entity, Constraint $constraint) {
+  public function validate(mixed $entity, Constraint $constraint): void {
     assert($constraint instanceof RequiredConfigDependenciesConstraint);
 
     // Only config entities can have config dependencies.

core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/EntityChangedConstraintValidator.php

@@ -13,7 +13,7 @@ class EntityChangedConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     if (isset($entity)) {
       /** @var \Drupal\Core\Entity\EntityInterface $entity */
       if (!$entity->isNew()) {

core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/EntityHasFieldConstraintValidator.php

@@ -14,7 +14,7 @@ class EntityHasFieldConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     if (!isset($entity)) {
       return;
     }

core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/EntityUntranslatableFieldsConstraintValidator.php

@@ -46,7 +46,7 @@ class EntityUntranslatableFieldsConstraintValidator extends ConstraintValidator
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
     /** @var \Drupal\Core\Entity\Plugin\Validation\Constraint\EntityUntranslatableFieldsConstraint $constraint */
 

core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ImmutablePropertiesConstraintValidator.php

@@ -40,7 +40,7 @@ class ImmutablePropertiesConstraintValidator extends ConstraintValidator impleme
   /**
    * {@inheritdoc}
    */
-  public function validate(mixed $value, Constraint $constraint) {
+  public function validate(mixed $value, Constraint $constraint): void {
     assert($constraint instanceof ImmutablePropertiesConstraint);
 
     if (!$value instanceof ConfigEntityInterface) {

core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ReferenceAccessConstraintValidator.php

@@ -13,7 +13,7 @@ class ReferenceAccessConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     /** @var \Drupal\Core\Field\FieldItemInterface $value */
     if (!isset($value)) {
       return;

core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ValidReferenceConstraintValidator.php

@@ -55,7 +55,7 @@ class ValidReferenceConstraintValidator extends ConstraintValidator implements C
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     /** @var \Drupal\Core\Field\FieldItemListInterface $value */
     /** @var ValidReferenceConstraint $constraint */
     if (!isset($value)) {

core/lib/Drupal/Core/Extension/Plugin/Validation/Constraint/ExtensionExistsConstraintValidator.php

@@ -56,7 +56,7 @@ class ExtensionExistsConstraintValidator extends ConstraintValidator implements
   /**
    * {@inheritdoc}
    */
-  public function validate(mixed $extension_name, Constraint $constraint) {
+  public function validate(mixed $extension_name, Constraint $constraint): void {
     $variables = ['@name' => $extension_name];
 
     switch ($constraint->type) {

core/lib/Drupal/Core/Path/Plugin/Validation/Constraint/UniquePathAliasConstraintValidator.php

@@ -42,7 +42,7 @@ class UniquePathAliasConstraintValidator extends ConstraintValidator implements
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     /** @var \Drupal\path_alias\PathAliasInterface $entity */
     $path = $entity->getPath();
     $alias = $entity->getAlias();

core/lib/Drupal/Core/Path/Plugin/Validation/Constraint/ValidPathConstraintValidator.php

@@ -42,7 +42,7 @@ class ValidPathConstraintValidator extends ConstraintValidator implements Contai
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     if (!isset($value)) {
       return;
     }

core/lib/Drupal/Core/Plugin/Plugin/Validation/Constraint/PluginExistsConstraintValidator.php

@@ -17,7 +17,7 @@ class PluginExistsConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate(mixed $plugin_id, Constraint $constraint) {
+  public function validate(mixed $plugin_id, Constraint $constraint): void {
     assert($constraint instanceof PluginExistsConstraint);
 
     if ($plugin_id === NULL) {

core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/ComplexDataConstraintValidator.php

@@ -19,7 +19,7 @@ class ComplexDataConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($data, Constraint $constraint) {
+  public function validate($data, Constraint $constraint): void {
 
     // If un-wrapped data has been passed, fetch the typed data object first.
     if (!$data instanceof TypedDataInterface) {

core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/EntityBundleExistsConstraintValidator.php

@@ -37,7 +37,7 @@ class EntityBundleExistsConstraintValidator extends ConstraintValidator implemen
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     assert($constraint instanceof EntityBundleExistsConstraint);
 
     if (!is_string($value)) {

core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/FullyValidatableConstraintValidator.php

@@ -17,7 +17,7 @@ final class FullyValidatableConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate(mixed $value, Constraint $constraint) {
+  public function validate(mixed $value, Constraint $constraint): void {
     // No-op.
   }
 

core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php

@@ -38,7 +38,7 @@ class UniqueFieldValueValidator extends ConstraintValidator implements Container
   /**
    * {@inheritdoc}
    */
-  public function validate($items, Constraint $constraint) {
+  public function validate($items, Constraint $constraint): void {
     if (!$items->first()) {
       return;
     }

core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/ValidKeysConstraintValidator.php

@@ -20,7 +20,7 @@ class ValidKeysConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate(mixed $value, Constraint $constraint) {
+  public function validate(mixed $value, Constraint $constraint): void {
     assert($constraint instanceof ValidKeysConstraint);
 
     if (!is_array($value)) {

core/modules/block_content/src/Plugin/Validation/Constraint/BlockContentEntityChangedConstraintValidator.php

@@ -14,7 +14,7 @@ class BlockContentEntityChangedConstraintValidator extends EntityChangedConstrai
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     // This prevents saving an update to the block via a host entity's form if
     // the host entity has had other changes made via the API instead of the
     // entity form, such as a revision revert. This is safe, for example, in the

core/modules/book/src/Plugin/Validation/Constraint/BookOutlineConstraintValidator.php

@@ -42,7 +42,7 @@ class BookOutlineConstraintValidator extends ConstraintValidator implements Cont
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     if (isset($entity) && !$entity->isNew() && !$entity->isDefaultRevision()) {
       /** @var \Drupal\Core\Entity\ContentEntityInterface $original */
       $original = $this->bookManager->loadBookLink($entity->id(), FALSE) ?: [

core/modules/ckeditor5/src/Plugin/Validation/Constraint/CKEditor5ElementConstraintValidator.php

@@ -21,7 +21,7 @@ class CKEditor5ElementConstraintValidator extends ConstraintValidator {
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($element, $constraint) {
+  public function validate($element, $constraint): void {
     if (!$constraint instanceof CKEditor5ElementConstraint) {
       throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\CKEditor5Element');
     }

core/modules/ckeditor5/src/Plugin/Validation/Constraint/CKEditor5MediaAndFilterSettingsInSyncConstraintValidator.php

@@ -67,7 +67,7 @@ class CKEditor5MediaAndFilterSettingsInSyncConstraintValidator extends Constrain
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($toolbar_item, Constraint $constraint) {
+  public function validate($toolbar_item, Constraint $constraint): void {
     if (!$constraint instanceof CKEditor5MediaAndFilterSettingsInSyncConstraint) {
       throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\CKEditor5MediaAndFilterSettingsInSync');
     }

core/modules/ckeditor5/src/Plugin/Validation/Constraint/EnabledConfigurablePluginsConstraintValidator.php

@@ -26,7 +26,7 @@ class EnabledConfigurablePluginsConstraintValidator extends ConstraintValidator
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($settings, Constraint $constraint) {
+  public function validate($settings, Constraint $constraint): void {
     if (!$constraint instanceof EnabledConfigurablePluginsConstraint) {
       throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\EnabledConfigurablePluginsConstraint');
     }

core/modules/ckeditor5/src/Plugin/Validation/Constraint/FundamentalCompatibilityConstraintValidator.php

@@ -52,7 +52,7 @@ class FundamentalCompatibilityConstraintValidator extends ConstraintValidator im
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($toolbar_item, Constraint $constraint) {
+  public function validate($toolbar_item, Constraint $constraint): void {
     if (!$constraint instanceof FundamentalCompatibilityConstraint) {
       throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\FundamentalCompatibility');
     }

core/modules/ckeditor5/src/Plugin/Validation/Constraint/SourceEditingPreventSelfXssConstraintValidator.php

@@ -24,7 +24,7 @@ class SourceEditingPreventSelfXssConstraintValidator extends ConstraintValidator
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     if (!$constraint instanceof SourceEditingPreventSelfXssConstraint) {
       throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\SourceEditingPreventSelfXssConstraint');
     }

core/modules/ckeditor5/src/Plugin/Validation/Constraint/SourceEditingRedundantTagsConstraintValidator.php

@@ -30,7 +30,7 @@ class SourceEditingRedundantTagsConstraintValidator extends ConstraintValidator
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     if (!$constraint instanceof SourceEditingRedundantTagsConstraint) {
       throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\SourceEditingRedundantTagsConstraint');
     }

core/modules/ckeditor5/src/Plugin/Validation/Constraint/StyleSensibleElementConstraintValidator.php

@@ -67,7 +67,7 @@ class StyleSensibleElementConstraintValidator extends ConstraintValidator implem
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($element, Constraint $constraint) {
+  public function validate($element, Constraint $constraint): void {
     if (!$constraint instanceof StyleSensibleElementConstraint) {
       throw new UnexpectedTypeException($constraint, StyleSensibleElementConstraint::class);
     }

core/modules/ckeditor5/src/Plugin/Validation/Constraint/ToolbarItemConditionsMetConstraintValidator.php

@@ -27,7 +27,7 @@ class ToolbarItemConditionsMetConstraintValidator extends ConstraintValidator im
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($toolbar_item, Constraint $constraint) {
+  public function validate($toolbar_item, Constraint $constraint): void {
     if (!$constraint instanceof ToolbarItemConditionsMetConstraint) {
       throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\ToolbarItemConditionsMetConstraint');
     }

core/modules/ckeditor5/src/Plugin/Validation/Constraint/ToolbarItemConstraintValidator.php

@@ -24,7 +24,7 @@ class ToolbarItemConstraintValidator extends ConstraintValidator implements Cont
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($toolbar_item, Constraint $constraint) {
+  public function validate($toolbar_item, Constraint $constraint): void {
     if (!$constraint instanceof ToolbarItemConstraint) {
       throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\ToolbarItem');
     }

core/modules/ckeditor5/src/Plugin/Validation/Constraint/ToolbarItemDependencyConstraintValidator.php

@@ -24,7 +24,7 @@ class ToolbarItemDependencyConstraintValidator extends ConstraintValidator imple
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($toolbar_item, Constraint $constraint) {
+  public function validate($toolbar_item, Constraint $constraint): void {
     if (!$constraint instanceof ToolbarItemDependencyConstraint) {
       throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\ToolbarItemDependency');
     }

core/modules/ckeditor5/src/Plugin/Validation/Constraint/UniqueLabelInListConstraintValidator.php

@@ -21,7 +21,7 @@ class UniqueLabelInListConstraintValidator extends ConstraintValidator {
    * @throws \Symfony\Component\Validator\Exception\UnexpectedTypeException
    *   Thrown when the given constraint is not supported by this validator.
    */
-  public function validate($list, Constraint $constraint) {
+  public function validate($list, Constraint $constraint): void {
     if (!$constraint instanceof UniqueLabelInListConstraint) {
       throw new UnexpectedTypeException($constraint, UniqueLabelInListConstraint::class);
     }

core/modules/comment/src/Plugin/Validation/Constraint/CommentNameConstraintValidator.php

@@ -41,7 +41,7 @@ class CommentNameConstraintValidator extends ConstraintValidator implements Cont
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     $author_name = $entity->name->value;
     $owner_id = (int) $entity->uid->target_id;
 

core/modules/content_moderation/src/Plugin/Validation/Constraint/ModerationStateConstraintValidator.php

@@ -79,7 +79,7 @@ class ModerationStateConstraintValidator extends ConstraintValidator implements
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
     $entity = $value->getEntity();
 

core/modules/content_translation/src/Plugin/Validation/Constraint/ContentTranslationSynchronizedFieldsConstraintValidator.php

@@ -85,7 +85,7 @@ class ContentTranslationSynchronizedFieldsConstraintValidator extends Constraint
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     /** @var \Drupal\content_translation\Plugin\Validation\Constraint\ContentTranslationSynchronizedFieldsConstraint $constraint */
     /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
     $entity = $value;

core/modules/datetime/src/Plugin/Validation/Constraint/DateTimeFormatConstraintValidator.php

@@ -16,7 +16,7 @@ class DateTimeFormatConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($item, Constraint $constraint) {
+  public function validate($item, Constraint $constraint): void {
     /** @var \Drupal\datetime\Plugin\Field\FieldType\DateTimeItem $item */
     if (isset($item)) {
       $value = $item->getValue()['value'];

core/modules/file/src/Plugin/Validation/Constraint/FileValidationConstraintValidator.php

@@ -34,7 +34,7 @@ class FileValidationConstraintValidator extends ConstraintValidator implements C
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     // Get the file to execute validators.
     $target = $value->get('entity')->getTarget();
     if (!$target) {

core/modules/file/src/Validation/Constraint/UploadedFileConstraintValidator.php

@@ -23,7 +23,7 @@ class UploadedFileConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate(mixed $value, Constraint $constraint) {
+  public function validate(mixed $value, Constraint $constraint): void {
     if (!$constraint instanceof UploadedFileConstraint) {
       throw new UnexpectedTypeException($constraint, UploadedFileConstraint::class);
     }

core/modules/forum/src/Plugin/Validation/Constraint/ForumLeafConstraintValidator.php

@@ -13,10 +13,10 @@ class ForumLeafConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($items, Constraint $constraint) {
+  public function validate($items, Constraint $constraint): void {
     $item = $items->first();
     if (!isset($item)) {
-      return NULL;
+      return;
     }
 
     // Verify that a term has been selected.

core/modules/link/src/Plugin/Validation/Constraint/LinkTypeConstraintValidator.php

@@ -14,7 +14,7 @@ class LinkTypeConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     if (isset($value)) {
       $uri_is_valid = TRUE;
 

core/modules/media/src/Plugin/Validation/Constraint/OEmbedResourceConstraintValidator.php

@@ -73,7 +73,7 @@ class OEmbedResourceConstraintValidator extends ConstraintValidator implements C
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     /** @var \Drupal\media\MediaInterface $media */
     $media = $value->getEntity();
     /** @var \Drupal\media\Plugin\media\Source\OEmbedInterface $source */

core/modules/media/tests/modules/media_test_source/src/Plugin/Validation/Constraint/MediaTestConstraintValidator.php

@@ -15,7 +15,7 @@ class MediaTestConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     if ($value instanceof EntityInterface) {
       $string_to_test = $value->label();
     }

core/modules/menu_link_content/src/Plugin/Validation/Constraint/MenuTreeHierarchyConstraintValidator.php

@@ -42,7 +42,7 @@ class MenuTreeHierarchyConstraintValidator extends ConstraintValidator implement
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     if ($entity && !$entity->isNew() && !$entity->isDefaultRevision()) {
       $original = $this->entityTypeManager->getStorage($entity->getEntityTypeId())->loadUnchanged($entity->id());
 

core/modules/menu_ui/src/Plugin/Validation/Constraint/MenuSettingsConstraintValidator.php

@@ -13,7 +13,7 @@ class MenuSettingsConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     if (isset($entity) && !$entity->isNew() && !$entity->isDefaultRevision()) {
       $defaults = menu_ui_get_menu_link_defaults($entity);
 

core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraintValidator.php

@@ -42,7 +42,7 @@ class PathAliasConstraintValidator extends ConstraintValidator implements Contai
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     $entity = !empty($value->getParent()) ? $value->getEntity() : NULL;
 
     if ($entity && !$entity->isNew() && !$entity->isDefaultRevision()) {

core/modules/rest/tests/modules/rest_test/src/Plugin/Validation/Constraint/RestTestConstraintValidator.php

@@ -14,7 +14,7 @@ class RestTestConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     if ($value instanceof FieldItemListInterface) {
       $value = $value->getValue();
       if (!empty($value[0]['value']) && $value[0]['value'] === 'ALWAYS_FAIL') {

core/modules/system/tests/modules/entity_test/src/Plugin/Validation/Constraint/EntityTestCompositeConstraintValidator.php

@@ -13,7 +13,7 @@ class EntityTestCompositeConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
 
     if ($entity->name->value === 'test' && $entity->type->value === 'test2') {
       $this->context->buildViolation($constraint->message)

core/modules/system/tests/modules/entity_test/src/Plugin/Validation/Constraint/EntityTestEntityLevelValidator.php

@@ -13,7 +13,7 @@ class EntityTestEntityLevelValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     if ($value->name->value === 'entity-level-violation') {
       $this->context->buildViolation($constraint->message)
         ->addViolation();

core/modules/system/tests/modules/entity_test/src/Plugin/Validation/Constraint/FieldWidgetConstraintValidator.php

@@ -13,7 +13,7 @@ class FieldWidgetConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($field_item, Constraint $constraint) {
+  public function validate($field_item, Constraint $constraint): void {
     $this->context->addViolation($constraint->message);
   }
 

core/modules/system/tests/modules/entity_test/src/Plugin/Validation/Constraint/TestValidatedReferenceConstraintValidator.php

@@ -13,7 +13,7 @@ class TestValidatedReferenceConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($items, Constraint $constraint) {
+  public function validate($items, Constraint $constraint): void {
     if (!isset($items)) {
       return;
     }

core/modules/taxonomy/src/Plugin/Validation/Constraint/TaxonomyTermHierarchyConstraintValidator.php

@@ -43,7 +43,7 @@ class TaxonomyTermHierarchyConstraintValidator extends ConstraintValidator imple
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     $term_storage = $this->entityTypeManager->getStorage($entity->getEntityTypeId());
     assert($term_storage instanceof TermStorageInterface);
 

core/modules/user/src/Plugin/Validation/Constraint/UserNameConstraintValidator.php

@@ -14,7 +14,7 @@ class UserNameConstraintValidator extends ConstraintValidator {
   /**
    * {@inheritdoc}
    */
-  public function validate($items, Constraint $constraint) {
+  public function validate($items, Constraint $constraint): void {
     if (!isset($items) || !$items->value) {
       $this->context->addViolation($constraint->emptyMessage);
       return;

core/modules/workspaces/src/Plugin/Validation/Constraint/DeletedWorkspaceConstraintValidator.php

@@ -42,7 +42,7 @@ class DeletedWorkspaceConstraintValidator extends ConstraintValidator implements
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     /** @var \Drupal\Core\Field\FieldItemListInterface $value */
     // This constraint applies only to newly created workspace entities.
     if (!isset($value) || !$value->getEntity()->isNew()) {

core/modules/workspaces/src/Plugin/Validation/Constraint/EntityReferenceSupportedNewEntitiesConstraintValidator.php

@@ -59,7 +59,7 @@ class EntityReferenceSupportedNewEntitiesConstraintValidator extends ConstraintV
   /**
    * {@inheritdoc}
    */
-  public function validate($value, Constraint $constraint) {
+  public function validate($value, Constraint $constraint): void {
     // The validator should run only if we are in a active workspace context.
     if (!$this->workspaceManager->hasActiveWorkspace()) {
       return;

core/modules/workspaces/src/Plugin/Validation/Constraint/EntityWorkspaceConflictConstraintValidator.php

@@ -40,7 +40,7 @@ class EntityWorkspaceConflictConstraintValidator extends ConstraintValidator imp
   /**
    * {@inheritdoc}
    */
-  public function validate($entity, Constraint $constraint) {
+  public function validate($entity, Constraint $constraint): void {
     /** @var \Drupal\Core\Entity\EntityInterface $entity */
     if (isset($entity) && !$entity->isNew()) {
       $active_workspace = $this->workspaceManager->getActiveWorkspace();