Fix implicit nullable parameter + add ECS rule (#1024)

| Q               | A
| --------------- | -----
| Bug fix?        | yes
| New feature?    | no
| BC breaks?      | no
| Deprecations?   | no
| Related tickets | 
| License         | MIT

Author: NoResponseMate

ecs.php

@@ -3,6 +3,7 @@
 use PhpCsFixer\Fixer\ClassNotation\VisibilityRequiredFixer;
 use PhpCsFixer\Fixer\Comment\HeaderCommentFixer;
 use PhpCsFixer\Fixer\FunctionNotation\MethodArgumentSpaceFixer;
+use PhpCsFixer\Fixer\FunctionNotation\NullableTypeDeclarationForDefaultNullValueFixer;
 use PhpCsFixer\Fixer\Phpdoc\NoSuperfluousPhpdocTagsFixer;
 use SlevomatCodingStandard\Sniffs\Commenting\InlineDocCommentDeclarationSniff;
 use Symplify\EasyCodingStandard\Config\ECSConfig;
@@ -27,6 +28,7 @@
         ])
     ;
     $ecsConfig->ruleWithConfiguration(NoSuperfluousPhpdocTagsFixer::class, ['allow_mixed' => true]);
+    $ecsConfig->ruleWithConfiguration(NullableTypeDeclarationForDefaultNullValueFixer::class, ['use_nullable_type_declaration' => true]);
 
     $ecsConfig->skip([
         InlineDocCommentDeclarationSniff::class . '.MissingVariable',

src/Bundle/Doctrine/ODM/MongoDB/TranslatableRepository.php

@@ -23,7 +23,7 @@
  */
 class TranslatableRepository extends DocumentRepository implements TranslatableRepositoryInterface
 {
-    protected function applyCriteria(QueryBuilder $queryBuilder, array $criteria = null): void
+    protected function applyCriteria(QueryBuilder $queryBuilder, ?array $criteria = null): void
     {
         if (null === $criteria) {
             return;
@@ -42,7 +42,7 @@ protected function applyCriteria(QueryBuilder $queryBuilder, array $criteria = n
         }
     }
 
-    protected function applySorting(QueryBuilder $queryBuilder, array $sorting = null): void
+    protected function applySorting(QueryBuilder $queryBuilder, ?array $sorting = null): void
     {
         if (null === $sorting) {
             return;

src/Component/src/Exception/StorageUnavailableException.php

@@ -15,7 +15,7 @@
 
 class StorageUnavailableException extends RuntimeException
 {
-    public function __construct(string $message = '', \Exception $previous = null)
+    public function __construct(string $message = '', ?\Exception $previous = null)
     {
         parent::__construct($message, 0, $previous);
     }

src/Component/src/Symfony/Validator/Exception/ValidationException.php

@@ -22,7 +22,7 @@
  */
 final class ValidationException extends \RuntimeException implements ConstraintViolationListAwareExceptionInterface
 {
-    public function __construct(private ConstraintViolationListInterface $constraintViolationList, string $message = '', int $code = 0, \Exception $previous = null)
+    public function __construct(private ConstraintViolationListInterface $constraintViolationList, string $message = '', int $code = 0, ?\Exception $previous = null)
     {
         parent::__construct($message ?: $this->__toString(), $code, $previous);
     }