Add types to private and final methods.

src/Symfony/Bridge/Doctrine/DataCollector/DoctrineDataCollector.php

@@ -119,7 +119,7 @@ class DoctrineDataCollector extends DataCollector
         return 'db';
     }
 
-    private function sanitizeQueries(string $connectionName, array $queries)
+    private function sanitizeQueries(string $connectionName, array $queries): array
     {
         foreach ($queries as $i => $query) {
             $queries[$i] = $this->sanitizeQuery($connectionName, $query);
@@ -128,7 +128,7 @@ class DoctrineDataCollector extends DataCollector
         return $queries;
     }
 
-    private function sanitizeQuery(string $connectionName, $query)
+    private function sanitizeQuery(string $connectionName, array $query): array
     {
         $query['explainable'] = true;
         if (null === $query['params']) {

src/Symfony/Bridge/Monolog/Formatter/ConsoleFormatter.php

@@ -180,7 +180,7 @@ class ConsoleFormatter implements FormatterInterface
         return $record;
     }
 
-    private function dumpData($data, $colors = null)
+    private function dumpData($data, bool $colors = null): string
     {
         if (null === $this->dumper) {
             return '';

src/Symfony/Bridge/Twig/Command/LintCommand.php

@@ -118,13 +118,13 @@ EOF
         throw new RuntimeException(sprintf('File or directory "%s" is not readable', $filename));
     }
 
-    private function validate(string $template, $file)
+    private function validate(string $template, string $file): array
     {
         $realLoader = $this->twig->getLoader();
         try {
-            $temporaryLoader = new ArrayLoader([(string) $file => $template]);
+            $temporaryLoader = new ArrayLoader([$file => $template]);
             $this->twig->setLoader($temporaryLoader);
-            $nodeTree = $this->twig->parse($this->twig->tokenize(new Source($template, (string) $file)));
+            $nodeTree = $this->twig->parse($this->twig->tokenize(new Source($template, $file)));
             $this->twig->compile($nodeTree);
             $this->twig->setLoader($realLoader);
         } catch (Error $e) {

src/Symfony/Bundle/FrameworkBundle/CacheWarmer/AbstractPhpFileCacheWarmer.php

@@ -72,7 +72,7 @@ abstract class AbstractPhpFileCacheWarmer implements CacheWarmerInterface
     /**
      * @internal
      */
-    final protected function ignoreAutoloadException($class, \Exception $exception)
+    final protected function ignoreAutoloadException(string $class, \Exception $exception): void
     {
         try {
             ClassExistenceResource::throwOnRequiredClass($class, $exception);

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -1069,7 +1069,7 @@ class FrameworkExtension extends Extension
     /**
      * Returns a definition for an asset package.
      */
-    private function createPackageDefinition(?string $basePath, array $baseUrls, Reference $version)
+    private function createPackageDefinition(?string $basePath, array $baseUrls, Reference $version): Definition
     {
         if ($basePath && $baseUrls) {
             throw new \LogicException('An asset package cannot have base URLs and base paths.');
@@ -1085,7 +1085,7 @@ class FrameworkExtension extends Extension
         return $package;
     }
 
-    private function createVersion(ContainerBuilder $container, ?string $version, ?string $format, ?string $jsonManifestPath, string $name)
+    private function createVersion(ContainerBuilder $container, ?string $version, ?string $format, ?string $jsonManifestPath, string $name): Reference
     {
         // Configuration prevents $version and $jsonManifestPath from being set
         if (null !== $version) {

src/Symfony/Component/BrowserKit/Cookie.php

@@ -199,7 +199,7 @@ class Cookie
         );
     }
 
-    private static function parseDate($dateValue)
+    private static function parseDate(string $dateValue): ?string
     {
         // trim single quotes around date if present
         if (($length = \strlen($dateValue)) > 1 && "'" === $dateValue[0] && "'" === $dateValue[$length - 1]) {
@@ -216,6 +216,8 @@ class Cookie
         if (false !== $date = date_create($dateValue, new \DateTimeZone('GMT'))) {
             return $date->format('U');
         }
+
+        return null;
     }
 
     /**

src/Symfony/Component/Filesystem/Filesystem.php

@@ -740,7 +740,10 @@ class Filesystem
         return 2 === \count($components) ? [$components[0], $components[1]] : [null, $components[0]];
     }
 
-    private static function box($func)
+    /**
+     * @return mixed
+     */
+    private static function box(callable $func)
     {
         self::$lastError = null;
         set_error_handler(__CLASS__.'::handleError');

src/Symfony/Component/Form/Extension/Core/Type/FileType.php

@@ -246,8 +246,8 @@ class FileType extends AbstractType
     /**
      * This method should be kept in sync with Symfony\Component\Validator\Constraints\FileValidator::moreDecimalsThan().
      */
-    private static function moreDecimalsThan($double, $numberOfDecimals)
+    private static function moreDecimalsThan(string $double, int $numberOfDecimals): bool
     {
-        return \strlen((string) $double) > \strlen(round($double, $numberOfDecimals));
+        return \strlen($double) > \strlen(round($double, $numberOfDecimals));
     }
 }

src/Symfony/Component/Form/FormFactoryBuilder.php

@@ -47,10 +47,7 @@ class FormFactoryBuilder implements FormFactoryBuilderInterface
      */
     private $typeGuessers = [];
 
-    /**
+    public function __construct(bool $forceCoreExtension = false)
-     * @param bool $forceCoreExtension
-     */
-    public function __construct($forceCoreExtension = false)
     {
         $this->forceCoreExtension = $forceCoreExtension;
     }

src/Symfony/Component/Messenger/MessageBus.php

@@ -39,7 +39,7 @@ class MessageBus implements MessageBusInterface
                 private $middlewareHandlers;
                 private $cachedIterator;
 
-                public function __construct($middlewareHandlers)
+                public function __construct(\Traversable $middlewareHandlers)
                 {
                     $this->middlewareHandlers = $middlewareHandlers;
                 }

src/Symfony/Component/PropertyAccess/PropertyAccessor.php

@@ -181,7 +181,7 @@ class PropertyAccessor implements PropertyAccessorInterface
         }
     }
 
-    private static function throwInvalidArgumentException($message, $trace, $i, $propertyPath)
+    private static function throwInvalidArgumentException(string $message, array $trace, int $i, string $propertyPath): void
     {
         // the type mismatch is not caused by invalid arguments (but e.g. by an incompatible return type hint of the writer method)
         if (0 !== strpos($message, 'Argument ')) {

src/Symfony/Component/Security/Core/Authorization/AccessDecisionManager.php

@@ -66,7 +66,7 @@ class AccessDecisionManager implements AccessDecisionManagerInterface
      * If all voters abstained from voting, the decision will be based on the
      * allowIfAllAbstainDecisions property value (defaults to false).
      */
-    private function decideAffirmative(TokenInterface $token, array $attributes, $object = null)
+    private function decideAffirmative(TokenInterface $token, array $attributes, $object = null): bool
     {
         $deny = 0;
         foreach ($this->voters as $voter) {
@@ -106,7 +106,7 @@ class AccessDecisionManager implements AccessDecisionManagerInterface
      * If all voters abstained from voting, the decision will be based on the
      * allowIfAllAbstainDecisions property value (defaults to false).
      */
-    private function decideConsensus(TokenInterface $token, array $attributes, $object = null)
+    private function decideConsensus(TokenInterface $token, array $attributes, $object = null): bool
     {
         $grant = 0;
         $deny = 0;
@@ -147,7 +147,7 @@ class AccessDecisionManager implements AccessDecisionManagerInterface
      * If all voters abstained from voting, the decision will be based on the
      * allowIfAllAbstainDecisions property value (defaults to false).
      */
-    private function decideUnanimous(TokenInterface $token, array $attributes, $object = null)
+    private function decideUnanimous(TokenInterface $token, array $attributes, $object = null): bool
     {
         $grant = 0;
         foreach ($this->voters as $voter) {

src/Symfony/Component/Security/Http/RememberMe/AbstractRememberMeServices.php

@@ -22,6 +22,7 @@ use Symfony\Component\Security\Core\Exception\CookieTheftException;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Security\Core\User\UserProviderInterface;
 use Symfony\Component\Security\Http\Logout\LogoutHandlerInterface;
 use Symfony\Component\Security\Http\ParameterBagUtils;
 
@@ -221,7 +222,7 @@ abstract class AbstractRememberMeServices implements RememberMeServicesInterface
      */
     abstract protected function onLoginSuccess(Request $request, Response $response, TokenInterface $token);
 
-    final protected function getUserProvider($class)
+    final protected function getUserProvider(string $class): UserProviderInterface
     {
         foreach ($this->userProviders as $provider) {
             if ($provider->supportsClass($class)) {

src/Symfony/Component/Translation/Command/XliffLintCommand.php

@@ -106,7 +106,7 @@ EOF
         return $this->display($io, $filesInfo);
     }
 
-    private function validate(string $content, $file = null)
+    private function validate(string $content, string $file = null): array
     {
         $errors = [];
 

src/Symfony/Component/Validator/Constraints/FileValidator.php

@@ -199,9 +199,9 @@ class FileValidator extends ConstraintValidator
         }
     }
 
-    private static function moreDecimalsThan($double, $numberOfDecimals)
+    private static function moreDecimalsThan(string $double, int $numberOfDecimals): bool
     {
-        return \strlen((string) $double) > \strlen(round($double, $numberOfDecimals));
+        return \strlen($double) > \strlen(round($double, $numberOfDecimals));
     }
 
     /**

src/Symfony/Component/Workflow/Registry.php

@@ -82,7 +82,11 @@ class Registry
         return $matched;
     }
 
-    private function supports(WorkflowInterface $workflow, $supportStrategy, $subject, $workflowName): bool
+    /**
+     * @param WorkflowSupportStrategyInterface $supportStrategy
+     * @param object                           $subject
+     */
+    private function supports(WorkflowInterface $workflow, $supportStrategy, $subject, ?string $workflowName): bool
     {
         if (null !== $workflowName && $workflowName !== $workflow->getName()) {
             return false;