From 00f08e4b9d88a23ae162e3b8c58df9e56e577e34 Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Thu, 12 Aug 2021 18:25:52 +0200
Subject: [PATCH] Add return types - batch 5/n

---
 .../Debug/TraceableEventDispatcher.php        | 20 ++-----
 .../RegisterListenersPass.php                 |  4 +-
 .../EventDispatcher/EventDispatcher.php       |  6 +-
 .../EventDispatcherInterface.php              |  6 +-
 .../EventDispatcher/GenericEvent.php          | 16 ++---
 .../ImmutableEventDispatcher.php              |  6 +-
 .../Component/ExpressionLanguage/Compiler.php | 10 ++--
 .../ExpressionLanguage/ExpressionFunction.php | 19 ++----
 .../ExpressionLanguage/ExpressionLanguage.php |  8 +--
 .../Component/ExpressionLanguage/Lexer.php    |  4 +-
 .../Component/ExpressionLanguage/Parser.php   |  2 +-
 .../Component/ExpressionLanguage/Token.php    |  4 +-
 .../ExpressionLanguage/TokenStream.php        |  4 +-
 .../OptionsResolver/OptionsResolver.php       | 34 +++++------
 .../PropertyAccess/PropertyAccessor.php       | 10 ++--
 .../PropertyAccessorBuilder.php               | 30 +++++-----
 .../PropertyAccessorInterface.php             |  6 +-
 .../Component/PropertyAccess/PropertyPath.php | 12 ++--
 .../PropertyAccess/PropertyPathBuilder.php    |  4 +-
 .../PropertyAccess/PropertyPathIterator.php   |  4 +-
 .../PropertyPathIteratorInterface.php         |  8 +--
 .../PropertyDescriptionExtractorInterface.php |  8 +--
 .../Component/Routing/CompiledRoute.php       | 16 ++---
 .../Exception/MethodNotAllowedException.php   |  2 +-
 .../Generator/CompiledUrlGenerator.php        |  2 +-
 .../ConfigurableRequirementsInterface.php     |  4 +-
 .../Dumper/CompiledUrlGeneratorDumper.php     |  2 +-
 .../Generator/Dumper/GeneratorDumper.php      |  2 +-
 .../Dumper/GeneratorDumperInterface.php       |  6 +-
 .../Routing/Generator/UrlGenerator.php        | 12 ++--
 .../Generator/UrlGeneratorInterface.php       |  2 +-
 .../Routing/Loader/AnnotationClassLoader.php  |  6 +-
 .../Loader/AnnotationDirectoryLoader.php      |  4 +-
 .../Routing/Loader/AnnotationFileLoader.php   |  6 +-
 .../Routing/Loader/ClosureLoader.php          |  4 +-
 .../Configurator/CollectionConfigurator.php   |  2 +-
 .../Configurator/ImportConfigurator.php       |  2 +-
 .../Routing/Loader/ContainerLoader.php        |  4 +-
 .../Routing/Loader/DirectoryLoader.php        |  4 +-
 .../Routing/Loader/GlobFileLoader.php         |  4 +-
 .../Component/Routing/Loader/ObjectLoader.php |  4 +-
 .../Routing/Loader/PhpFileLoader.php          |  4 +-
 .../Routing/Loader/XmlFileLoader.php          |  6 +-
 .../Routing/Loader/YamlFileLoader.php         |  4 +-
 .../Dumper/CompiledUrlMatcherDumper.php       |  2 +-
 .../Routing/Matcher/Dumper/MatcherDumper.php  |  2 +-
 .../Matcher/Dumper/MatcherDumperInterface.php |  4 +-
 .../Matcher/ExpressionLanguageProvider.php    |  2 +-
 .../Matcher/RedirectableUrlMatcher.php        |  2 +-
 .../RedirectableUrlMatcherInterface.php       |  2 +-
 .../Matcher/RequestMatcherInterface.php       |  2 +-
 .../Routing/Matcher/TraceableUrlMatcher.php   |  2 +-
 .../Component/Routing/Matcher/UrlMatcher.php  | 14 ++---
 .../Routing/Matcher/UrlMatcherInterface.php   |  2 +-
 .../Component/Routing/RequestContext.php      | 44 +++++++-------
 .../Routing/RequestContextAwareInterface.php  |  2 +-
 src/Symfony/Component/Routing/Route.php       | 60 +++++++++----------
 .../Component/Routing/RouteCollection.php     |  6 +-
 .../Component/Routing/RouteCompiler.php       |  2 +-
 .../Routing/RouteCompilerInterface.php        |  2 +-
 src/Symfony/Component/Routing/Router.php      | 18 +++---
 .../Catalogue/AbstractOperation.php           | 10 ++--
 .../Catalogue/OperationInterface.php          | 10 ++--
 .../Translation/Command/XliffLintCommand.php  |  2 +-
 .../TranslationDataCollector.php              |  2 +-
 .../Translation/DataCollectorTranslator.php   |  8 +--
 .../TranslatorPathsPass.php                   |  2 +-
 .../Translation/Dumper/CsvFileDumper.php      |  4 +-
 .../Translation/Dumper/FileDumper.php         |  4 +-
 .../Translation/Dumper/IcuResFileDumper.php   |  4 +-
 .../Translation/Dumper/IniFileDumper.php      |  4 +-
 .../Translation/Dumper/JsonFileDumper.php     |  4 +-
 .../Translation/Dumper/MoFileDumper.php       |  4 +-
 .../Translation/Dumper/PhpFileDumper.php      |  4 +-
 .../Translation/Dumper/PoFileDumper.php       |  4 +-
 .../Translation/Dumper/QtFileDumper.php       |  4 +-
 .../Translation/Dumper/XliffFileDumper.php    |  4 +-
 .../Translation/Dumper/YamlFileDumper.php     |  4 +-
 .../Extractor/AbstractFileExtractor.php       |  4 +-
 .../Translation/Extractor/PhpExtractor.php    |  6 +-
 .../Extractor/PhpStringTokenParser.php        |  6 +-
 .../Formatter/MessageFormatter.php            |  2 +-
 .../Formatter/MessageFormatterInterface.php   |  2 +-
 .../Translation/Loader/ArrayLoader.php        |  2 +-
 .../Translation/Loader/CsvFileLoader.php      |  2 +-
 .../Translation/Loader/FileLoader.php         |  5 +-
 .../Translation/Loader/IcuDatFileLoader.php   |  2 +-
 .../Translation/Loader/IcuResFileLoader.php   |  4 +-
 .../Translation/Loader/IniFileLoader.php      |  2 +-
 .../Translation/Loader/JsonFileLoader.php     |  2 +-
 .../Translation/Loader/LoaderInterface.php    |  2 +-
 .../Translation/Loader/MoFileLoader.php       |  2 +-
 .../Translation/Loader/PhpFileLoader.php      |  2 +-
 .../Translation/Loader/PoFileLoader.php       |  2 +-
 .../Translation/Loader/QtFileLoader.php       |  2 +-
 .../Translation/Loader/XliffFileLoader.php    |  2 +-
 .../Translation/Loader/YamlFileLoader.php     |  2 +-
 .../Translation/LoggingTranslator.php         |  4 +-
 .../Translation/MessageCatalogue.php          | 16 ++---
 .../Translation/MessageCatalogueInterface.php | 18 +++---
 .../Translation/MetadataAwareInterface.php    |  2 +-
 .../Component/Translation/Translator.php      |  4 +-
 .../Translation/TranslatorBagInterface.php    |  2 +-
 .../Translation/Util/ArrayConverter.php       |  2 +-
 .../Translation/Writer/TranslationWriter.php  |  2 +-
 105 files changed, 313 insertions(+), 363 deletions(-)

diff --git a/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php b/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
index edea60f866f98..0593fe99cc9d0 100644
--- a/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
+++ b/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
@@ -92,7 +92,7 @@ public function removeSubscriber(EventSubscriberInterface $subscriber)
     /**
      * {@inheritdoc}
      */
-    public function getListeners(string $eventName = null)
+    public function getListeners(string $eventName = null): array
     {
         return $this->dispatcher->getListeners($eventName);
     }
@@ -100,7 +100,7 @@ public function getListeners(string $eventName = null)
     /**
      * {@inheritdoc}
      */
-    public function getListenerPriority(string $eventName, callable|array $listener)
+    public function getListenerPriority(string $eventName, callable|array $listener): ?int
     {
         // we might have wrapped listeners for the event (if called while dispatching)
         // in that case get the priority by wrapper
@@ -118,7 +118,7 @@ public function getListenerPriority(string $eventName, callable|array $listener)
     /**
      * {@inheritdoc}
      */
-    public function hasListeners(string $eventName = null)
+    public function hasListeners(string $eventName = null): bool
     {
         return $this->dispatcher->hasListeners($eventName);
     }
@@ -163,10 +163,7 @@ public function dispatch(object $event, string $eventName = null): object
         return $event;
     }
 
-    /**
-     * @return array
-     */
-    public function getCalledListeners(Request $request = null)
+    public function getCalledListeners(Request $request = null): array
     {
         if (null === $this->callStack) {
             return [];
@@ -184,10 +181,7 @@ public function getCalledListeners(Request $request = null)
         return $called;
     }
 
-    /**
-     * @return array
-     */
-    public function getNotCalledListeners(Request $request = null)
+    public function getNotCalledListeners(Request $request = null): array
     {
         try {
             $allListeners = $this->getListeners();
@@ -255,10 +249,8 @@ public function reset()
      *
      * @param string $method    The method name
      * @param array  $arguments The method arguments
-     *
-     * @return mixed
      */
-    public function __call(string $method, array $arguments)
+    public function __call(string $method, array $arguments): mixed
     {
         return $this->dispatcher->{$method}(...$arguments);
     }
diff --git a/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php b/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php
index e57f65041f0cf..8dd589d52acb2 100644
--- a/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php
+++ b/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php
@@ -31,7 +31,7 @@ class RegisterListenersPass implements CompilerPassInterface
     /**
      * @return $this
      */
-    public function setHotPathEvents(array $hotPathEvents)
+    public function setHotPathEvents(array $hotPathEvents): static
     {
         $this->hotPathEvents = array_flip($hotPathEvents);
 
@@ -41,7 +41,7 @@ public function setHotPathEvents(array $hotPathEvents)
     /**
      * @return $this
      */
-    public function setNoPreloadEvents(array $noPreloadEvents): self
+    public function setNoPreloadEvents(array $noPreloadEvents): static
     {
         $this->noPreloadEvents = array_flip($noPreloadEvents);
 
diff --git a/src/Symfony/Component/EventDispatcher/EventDispatcher.php b/src/Symfony/Component/EventDispatcher/EventDispatcher.php
index 021d668eaa004..33d91b7d28e3d 100644
--- a/src/Symfony/Component/EventDispatcher/EventDispatcher.php
+++ b/src/Symfony/Component/EventDispatcher/EventDispatcher.php
@@ -65,7 +65,7 @@ public function dispatch(object $event, string $eventName = null): object
     /**
      * {@inheritdoc}
      */
-    public function getListeners(string $eventName = null)
+    public function getListeners(string $eventName = null): array
     {
         if (null !== $eventName) {
             if (empty($this->listeners[$eventName])) {
@@ -91,7 +91,7 @@ public function getListeners(string $eventName = null)
     /**
      * {@inheritdoc}
      */
-    public function getListenerPriority(string $eventName, callable|array $listener)
+    public function getListenerPriority(string $eventName, callable|array $listener): ?int
     {
         if (empty($this->listeners[$eventName])) {
             return null;
@@ -120,7 +120,7 @@ public function getListenerPriority(string $eventName, callable|array $listener)
     /**
      * {@inheritdoc}
      */
-    public function hasListeners(string $eventName = null)
+    public function hasListeners(string $eventName = null): bool
     {
         if (null !== $eventName) {
             return !empty($this->listeners[$eventName]);
diff --git a/src/Symfony/Component/EventDispatcher/EventDispatcherInterface.php b/src/Symfony/Component/EventDispatcher/EventDispatcherInterface.php
index 9251e02e67ea8..6de7750319b68 100644
--- a/src/Symfony/Component/EventDispatcher/EventDispatcherInterface.php
+++ b/src/Symfony/Component/EventDispatcher/EventDispatcherInterface.php
@@ -50,7 +50,7 @@ public function removeSubscriber(EventSubscriberInterface $subscriber);
      *
      * @return array The event listeners for the specified event, or all event listeners by event name
      */
-    public function getListeners(string $eventName = null);
+    public function getListeners(string $eventName = null): array;
 
     /**
      * Gets the listener priority for a specific event.
@@ -59,12 +59,12 @@ public function getListeners(string $eventName = null);
      *
      * @return int|null The event listener priority
      */
-    public function getListenerPriority(string $eventName, callable $listener);
+    public function getListenerPriority(string $eventName, callable $listener): ?int;
 
     /**
      * Checks whether an event has any registered listeners.
      *
      * @return bool true if the specified event has any listeners, false otherwise
      */
-    public function hasListeners(string $eventName = null);
+    public function hasListeners(string $eventName = null): bool;
 }
diff --git a/src/Symfony/Component/EventDispatcher/GenericEvent.php b/src/Symfony/Component/EventDispatcher/GenericEvent.php
index 1871eec8e6b3c..202a0f04aaded 100644
--- a/src/Symfony/Component/EventDispatcher/GenericEvent.php
+++ b/src/Symfony/Component/EventDispatcher/GenericEvent.php
@@ -42,7 +42,7 @@ public function __construct(mixed $subject = null, array $arguments = [])
      *
      * @return mixed The observer subject
      */
-    public function getSubject()
+    public function getSubject(): mixed
     {
         return $this->subject;
     }
@@ -54,7 +54,7 @@ public function getSubject()
      *
      * @throws \InvalidArgumentException if key is not found
      */
-    public function getArgument(string $key)
+    public function getArgument(string $key): mixed
     {
         if ($this->hasArgument($key)) {
             return $this->arguments[$key];
@@ -68,7 +68,7 @@ public function getArgument(string $key)
      *
      * @return $this
      */
-    public function setArgument(string $key, mixed $value)
+    public function setArgument(string $key, mixed $value): static
     {
         $this->arguments[$key] = $value;
 
@@ -77,10 +77,8 @@ public function setArgument(string $key, mixed $value)
 
     /**
      * Getter for all arguments.
-     *
-     * @return array
      */
-    public function getArguments()
+    public function getArguments(): array
     {
         return $this->arguments;
     }
@@ -90,7 +88,7 @@ public function getArguments()
      *
      * @return $this
      */
-    public function setArguments(array $args = [])
+    public function setArguments(array $args = []): static
     {
         $this->arguments = $args;
 
@@ -99,10 +97,8 @@ public function setArguments(array $args = [])
 
     /**
      * Has argument.
-     *
-     * @return bool
      */
-    public function hasArgument(string $key)
+    public function hasArgument(string $key): bool
     {
         return \array_key_exists($key, $this->arguments);
     }
diff --git a/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php b/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php
index 6bc8bfffaeb96..a54358284985e 100644
--- a/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php
+++ b/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php
@@ -68,7 +68,7 @@ public function removeSubscriber(EventSubscriberInterface $subscriber)
     /**
      * {@inheritdoc}
      */
-    public function getListeners(string $eventName = null)
+    public function getListeners(string $eventName = null): array
     {
         return $this->dispatcher->getListeners($eventName);
     }
@@ -76,7 +76,7 @@ public function getListeners(string $eventName = null)
     /**
      * {@inheritdoc}
      */
-    public function getListenerPriority(string $eventName, callable|array $listener)
+    public function getListenerPriority(string $eventName, callable|array $listener): ?int
     {
         return $this->dispatcher->getListenerPriority($eventName, $listener);
     }
@@ -84,7 +84,7 @@ public function getListenerPriority(string $eventName, callable|array $listener)
     /**
      * {@inheritdoc}
      */
-    public function hasListeners(string $eventName = null)
+    public function hasListeners(string $eventName = null): bool
     {
         return $this->dispatcher->hasListeners($eventName);
     }
diff --git a/src/Symfony/Component/ExpressionLanguage/Compiler.php b/src/Symfony/Component/ExpressionLanguage/Compiler.php
index 11260fa33cb88..738836eaaf723 100644
--- a/src/Symfony/Component/ExpressionLanguage/Compiler.php
+++ b/src/Symfony/Component/ExpressionLanguage/Compiler.php
@@ -38,7 +38,7 @@ public function getFunction(string $name)
      *
      * @return string The PHP code
      */
-    public function getSource()
+    public function getSource(): string
     {
         return $this->source;
     }
@@ -55,7 +55,7 @@ public function reset()
      *
      * @return $this
      */
-    public function compile(Node\Node $node)
+    public function compile(Node\Node $node): static
     {
         $node->compile($this);
 
@@ -80,7 +80,7 @@ public function subcompile(Node\Node $node)
      *
      * @return $this
      */
-    public function raw(string $string)
+    public function raw(string $string): static
     {
         $this->source .= $string;
 
@@ -92,7 +92,7 @@ public function raw(string $string)
      *
      * @return $this
      */
-    public function string(string $value)
+    public function string(string $value): static
     {
         $this->source .= sprintf('"%s"', addcslashes($value, "\0\t\"\$\\"));
 
@@ -104,7 +104,7 @@ public function string(string $value)
      *
      * @return $this
      */
-    public function repr(mixed $value)
+    public function repr(mixed $value): static
     {
         if (\is_int($value) || \is_float($value)) {
             if (false !== $locale = setlocale(\LC_NUMERIC, 0)) {
diff --git a/src/Symfony/Component/ExpressionLanguage/ExpressionFunction.php b/src/Symfony/Component/ExpressionLanguage/ExpressionFunction.php
index 7d4662cedfa68..6cf14a0b48ce1 100644
--- a/src/Symfony/Component/ExpressionLanguage/ExpressionFunction.php
+++ b/src/Symfony/Component/ExpressionLanguage/ExpressionFunction.php
@@ -46,26 +46,17 @@ public function __construct(string $name, callable $compiler, callable $evaluato
         $this->evaluator = $evaluator instanceof \Closure ? $evaluator : \Closure::fromCallable($evaluator);
     }
 
-    /**
-     * @return string
-     */
-    public function getName()
+    public function getName(): string
     {
         return $this->name;
     }
 
-    /**
-     * @return \Closure
-     */
-    public function getCompiler()
+    public function getCompiler(): \Closure
     {
         return $this->compiler;
     }
 
-    /**
-     * @return \Closure
-     */
-    public function getEvaluator()
+    public function getEvaluator(): \Closure
     {
         return $this->evaluator;
     }
@@ -75,13 +66,11 @@ public function getEvaluator()
      *
      * @param string|null $expressionFunctionName The expression function name (default: same than the PHP function name)
      *
-     * @return self
-     *
      * @throws \InvalidArgumentException if given PHP function name does not exist
      * @throws \InvalidArgumentException if given PHP function name is in namespace
      *                                   and expression function name is not defined
      */
-    public static function fromPhp(string $phpFunctionName, string $expressionFunctionName = null)
+    public static function fromPhp(string $phpFunctionName, string $expressionFunctionName = null): self
     {
         $phpFunctionName = ltrim($phpFunctionName, '\\');
         if (!\function_exists($phpFunctionName)) {
diff --git a/src/Symfony/Component/ExpressionLanguage/ExpressionLanguage.php b/src/Symfony/Component/ExpressionLanguage/ExpressionLanguage.php
index e0bc7ed89e7cc..200b5b2bfbfc4 100644
--- a/src/Symfony/Component/ExpressionLanguage/ExpressionLanguage.php
+++ b/src/Symfony/Component/ExpressionLanguage/ExpressionLanguage.php
@@ -48,7 +48,7 @@ public function __construct(CacheItemPoolInterface $cache = null, array $provide
      *
      * @return string The compiled PHP source code
      */
-    public function compile(Expression|string $expression, array $names = [])
+    public function compile(Expression|string $expression, array $names = []): string
     {
         return $this->getCompiler()->compile($this->parse($expression, $names)->getNodes())->getSource();
     }
@@ -58,17 +58,15 @@ public function compile(Expression|string $expression, array $names = [])
      *
      * @return mixed The result of the evaluation of the expression
      */
-    public function evaluate(Expression|string $expression, array $values = [])
+    public function evaluate(Expression|string $expression, array $values = []): mixed
     {
         return $this->parse($expression, array_keys($values))->getNodes()->evaluate($this->functions, $values);
     }
 
     /**
      * Parses an expression.
-     *
-     * @return ParsedExpression
      */
-    public function parse(Expression|string $expression, array $names)
+    public function parse(Expression|string $expression, array $names): ParsedExpression
     {
         if ($expression instanceof ParsedExpression) {
             return $expression;
diff --git a/src/Symfony/Component/ExpressionLanguage/Lexer.php b/src/Symfony/Component/ExpressionLanguage/Lexer.php
index a5e8fd40dfc17..2c69d344dd44e 100644
--- a/src/Symfony/Component/ExpressionLanguage/Lexer.php
+++ b/src/Symfony/Component/ExpressionLanguage/Lexer.php
@@ -21,11 +21,9 @@ class Lexer
     /**
      * Tokenizes an expression.
      *
-     * @return TokenStream
-     *
      * @throws SyntaxError
      */
-    public function tokenize(string $expression)
+    public function tokenize(string $expression): TokenStream
     {
         $expression = str_replace(["\r", "\n", "\t", "\v", "\f"], ' ', $expression);
         $cursor = 0;
diff --git a/src/Symfony/Component/ExpressionLanguage/Parser.php b/src/Symfony/Component/ExpressionLanguage/Parser.php
index e5ae97719638f..37ca825692460 100644
--- a/src/Symfony/Component/ExpressionLanguage/Parser.php
+++ b/src/Symfony/Component/ExpressionLanguage/Parser.php
@@ -90,7 +90,7 @@ public function __construct(array $functions)
      *
      * @throws SyntaxError
      */
-    public function parse(TokenStream $stream, array $names = [])
+    public function parse(TokenStream $stream, array $names = []): Node\Node
     {
         $this->lint = false;
 
diff --git a/src/Symfony/Component/ExpressionLanguage/Token.php b/src/Symfony/Component/ExpressionLanguage/Token.php
index 4a789c3c7f49b..40f5cda314763 100644
--- a/src/Symfony/Component/ExpressionLanguage/Token.php
+++ b/src/Symfony/Component/ExpressionLanguage/Token.php
@@ -50,10 +50,8 @@ public function __toString(): string
 
     /**
      * Tests the current token for a type and/or a value.
-     *
-     * @return bool
      */
-    public function test(string $type, string $value = null)
+    public function test(string $type, string $value = null): bool
     {
         return $this->type === $type && (null === $value || $this->value == $value);
     }
diff --git a/src/Symfony/Component/ExpressionLanguage/TokenStream.php b/src/Symfony/Component/ExpressionLanguage/TokenStream.php
index a94da8de33389..bbd1d8ab95789 100644
--- a/src/Symfony/Component/ExpressionLanguage/TokenStream.php
+++ b/src/Symfony/Component/ExpressionLanguage/TokenStream.php
@@ -67,10 +67,8 @@ public function expect(string $type, string $value = null, string $message = nul
 
     /**
      * Checks if end of stream was reached.
-     *
-     * @return bool
      */
-    public function isEOF()
+    public function isEOF(): bool
     {
         return Token::EOF_TYPE === $this->current->type;
     }
diff --git a/src/Symfony/Component/OptionsResolver/OptionsResolver.php b/src/Symfony/Component/OptionsResolver/OptionsResolver.php
index e0da5a685caed..d3e8800d86f88 100644
--- a/src/Symfony/Component/OptionsResolver/OptionsResolver.php
+++ b/src/Symfony/Component/OptionsResolver/OptionsResolver.php
@@ -191,7 +191,7 @@ class OptionsResolver implements Options
      *
      * @throws AccessException If called from a lazy option or normalizer
      */
-    public function setDefault(string $option, mixed $value)
+    public function setDefault(string $option, mixed $value): static
     {
         // Setting is not possible once resolving starts, because then lazy
         // options could manipulate the state of the object, leading to
@@ -262,7 +262,7 @@ public function setDefault(string $option, mixed $value)
      *
      * @throws AccessException If called from a lazy option or normalizer
      */
-    public function setDefaults(array $defaults)
+    public function setDefaults(array $defaults): static
     {
         foreach ($defaults as $option => $value) {
             $this->setDefault($option, $value);
@@ -279,7 +279,7 @@ public function setDefaults(array $defaults)
      *
      * @return bool Whether a default value is set
      */
-    public function hasDefault(string $option)
+    public function hasDefault(string $option): bool
     {
         return \array_key_exists($option, $this->defaults);
     }
@@ -293,7 +293,7 @@ public function hasDefault(string $option)
      *
      * @throws AccessException If called from a lazy option or normalizer
      */
-    public function setRequired(string|array $optionNames)
+    public function setRequired(string|array $optionNames): static
     {
         if ($this->locked) {
             throw new AccessException('Options cannot be made required from a lazy option or normalizer.');
@@ -314,7 +314,7 @@ public function setRequired(string|array $optionNames)
      *
      * @return bool Whether the option is required
      */
-    public function isRequired(string $option)
+    public function isRequired(string $option): bool
     {
         return isset($this->required[$option]);
     }
@@ -326,7 +326,7 @@ public function isRequired(string $option)
      *
      * @see isRequired()
      */
-    public function getRequiredOptions()
+    public function getRequiredOptions(): array
     {
         return array_keys($this->required);
     }
@@ -340,7 +340,7 @@ public function getRequiredOptions()
      *
      * @return bool Whether the option is missing
      */
-    public function isMissing(string $option)
+    public function isMissing(string $option): bool
     {
         return isset($this->required[$option]) && !\array_key_exists($option, $this->defaults);
     }
@@ -352,7 +352,7 @@ public function isMissing(string $option)
      *
      * @see isMissing()
      */
-    public function getMissingOptions()
+    public function getMissingOptions(): array
     {
         return array_keys(array_diff_key($this->required, $this->defaults));
     }
@@ -370,7 +370,7 @@ public function getMissingOptions()
      *
      * @throws AccessException If called from a lazy option or normalizer
      */
-    public function setDefined(string|array $optionNames)
+    public function setDefined(string|array $optionNames): static
     {
         if ($this->locked) {
             throw new AccessException('Options cannot be defined from a lazy option or normalizer.');
@@ -391,7 +391,7 @@ public function setDefined(string|array $optionNames)
      *
      * @return bool Whether the option is defined
      */
-    public function isDefined(string $option)
+    public function isDefined(string $option): bool
     {
         return isset($this->defined[$option]);
     }
@@ -403,7 +403,7 @@ public function isDefined(string $option)
      *
      * @see isDefined()
      */
-    public function getDefinedOptions()
+    public function getDefinedOptions(): array
     {
         return array_keys($this->defined);
     }
@@ -534,7 +534,7 @@ public function setNormalizer(string $option, \Closure $normalizer)
      * @throws UndefinedOptionsException If the option is undefined
      * @throws AccessException           If called from a lazy option or normalizer
      */
-    public function addNormalizer(string $option, \Closure $normalizer, bool $forcePrepend = false): self
+    public function addNormalizer(string $option, \Closure $normalizer, bool $forcePrepend = false): static
     {
         if ($this->locked) {
             throw new AccessException('Normalizers cannot be set from a lazy option or normalizer.');
@@ -733,7 +733,7 @@ public function define(string $option): OptionConfigurator
      * @throws UndefinedOptionsException If the option is undefined
      * @throws AccessException           If called from a lazy option or normalizer
      */
-    public function setInfo(string $option, string $info): self
+    public function setInfo(string $option, string $info): static
     {
         if ($this->locked) {
             throw new AccessException('The Info message cannot be set from a lazy option or normalizer.');
@@ -767,7 +767,7 @@ public function getInfo(string $option): ?string
      *
      * @throws AccessException If called from a lazy option, a normalizer or a root definition
      */
-    public function setPrototype(bool $prototype): self
+    public function setPrototype(bool $prototype): static
     {
         if ($this->locked) {
             throw new AccessException('The prototype property cannot be set from a lazy option or normalizer.');
@@ -798,7 +798,7 @@ public function isPrototype(): bool
      *
      * @throws AccessException If called from a lazy option or normalizer
      */
-    public function remove(string|array $optionNames)
+    public function remove(string|array $optionNames): static
     {
         if ($this->locked) {
             throw new AccessException('Options cannot be removed from a lazy option or normalizer.');
@@ -819,7 +819,7 @@ public function remove(string|array $optionNames)
      *
      * @throws AccessException If called from a lazy option or normalizer
      */
-    public function clear()
+    public function clear(): static
     {
         if ($this->locked) {
             throw new AccessException('Options cannot be cleared from a lazy option or normalizer.');
@@ -862,7 +862,7 @@ public function clear()
      * @throws NoSuchOptionException     If a lazy option reads an unavailable option
      * @throws AccessException           If called from a lazy option or normalizer
      */
-    public function resolve(array $options = [])
+    public function resolve(array $options = []): array
     {
         if ($this->locked) {
             throw new AccessException('Options cannot be resolved from a lazy option or normalizer.');
diff --git a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
index 0e439b53f512c..18960b8f9acc3 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
@@ -105,7 +105,7 @@ public function __construct(int $magicMethods = self::MAGIC_GET | self::MAGIC_SE
     /**
      * {@inheritdoc}
      */
-    public function getValue(object|array $objectOrArray, string|PropertyPathInterface $propertyPath)
+    public function getValue(object|array $objectOrArray, string|PropertyPathInterface $propertyPath): mixed
     {
         $zval = [
             self::VALUE => $objectOrArray,
@@ -219,7 +219,7 @@ private static function throwInvalidArgumentException(string $message, array $tr
     /**
      * {@inheritdoc}
      */
-    public function isReadable(object|array $objectOrArray, string|PropertyPathInterface $propertyPath)
+    public function isReadable(object|array $objectOrArray, string|PropertyPathInterface $propertyPath): bool
     {
         if (!$propertyPath instanceof PropertyPathInterface) {
             $propertyPath = new PropertyPath($propertyPath);
@@ -242,7 +242,7 @@ public function isReadable(object|array $objectOrArray, string|PropertyPathInter
     /**
      * {@inheritdoc}
      */
-    public function isWritable(object|array $objectOrArray, string|PropertyPathInterface $propertyPath)
+    public function isWritable(object|array $objectOrArray, string|PropertyPathInterface $propertyPath): bool
     {
         $propertyPath = $this->getPropertyPath($propertyPath);
 
@@ -651,11 +651,9 @@ private function getPropertyPath(string|PropertyPath $propertyPath): PropertyPat
     /**
      * Creates the APCu adapter if applicable.
      *
-     * @return AdapterInterface
-     *
      * @throws \LogicException When the Cache Component isn't available
      */
-    public static function createCache(string $namespace, int $defaultLifetime, string $version, LoggerInterface $logger = null)
+    public static function createCache(string $namespace, int $defaultLifetime, string $version, LoggerInterface $logger = null): AdapterInterface
     {
         if (!class_exists(ApcuAdapter::class)) {
             throw new \LogicException(sprintf('The Symfony Cache component must be installed to use "%s()".', __METHOD__));
diff --git a/src/Symfony/Component/PropertyAccess/PropertyAccessorBuilder.php b/src/Symfony/Component/PropertyAccess/PropertyAccessorBuilder.php
index 0e2acb24f950b..413f2c6339a6a 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyAccessorBuilder.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyAccessorBuilder.php
@@ -67,7 +67,7 @@ public function disableMagicMethods(): self
      *
      * @return $this
      */
-    public function enableMagicCall()
+    public function enableMagicCall(): static
     {
         $this->magicMethods |= PropertyAccessor::MAGIC_CALL;
 
@@ -99,7 +99,7 @@ public function enableMagicSet(): self
      *
      * @return $this
      */
-    public function disableMagicCall()
+    public function disableMagicCall(): static
     {
         $this->magicMethods &= ~PropertyAccessor::MAGIC_CALL;
 
@@ -129,7 +129,7 @@ public function disableMagicSet(): self
     /**
      * @return bool whether the use of "__call" by the PropertyAccessor is enabled
      */
-    public function isMagicCallEnabled()
+    public function isMagicCallEnabled(): bool
     {
         return (bool) ($this->magicMethods & PropertyAccessor::MAGIC_CALL);
     }
@@ -158,7 +158,7 @@ public function isMagicSetEnabled(): bool
      *
      * @return $this
      */
-    public function enableExceptionOnInvalidIndex()
+    public function enableExceptionOnInvalidIndex(): static
     {
         $this->throwExceptionOnInvalidIndex = true;
 
@@ -172,7 +172,7 @@ public function enableExceptionOnInvalidIndex()
      *
      * @return $this
      */
-    public function disableExceptionOnInvalidIndex()
+    public function disableExceptionOnInvalidIndex(): static
     {
         $this->throwExceptionOnInvalidIndex = false;
 
@@ -182,7 +182,7 @@ public function disableExceptionOnInvalidIndex()
     /**
      * @return bool whether an exception is thrown or null is returned when reading a non-existing index
      */
-    public function isExceptionOnInvalidIndexEnabled()
+    public function isExceptionOnInvalidIndexEnabled(): bool
     {
         return $this->throwExceptionOnInvalidIndex;
     }
@@ -195,7 +195,7 @@ public function isExceptionOnInvalidIndexEnabled()
      *
      * @return $this
      */
-    public function enableExceptionOnInvalidPropertyPath()
+    public function enableExceptionOnInvalidPropertyPath(): static
     {
         $this->throwExceptionOnInvalidPropertyPath = true;
 
@@ -209,7 +209,7 @@ public function enableExceptionOnInvalidPropertyPath()
      *
      * @return $this
      */
-    public function disableExceptionOnInvalidPropertyPath()
+    public function disableExceptionOnInvalidPropertyPath(): static
     {
         $this->throwExceptionOnInvalidPropertyPath = false;
 
@@ -219,7 +219,7 @@ public function disableExceptionOnInvalidPropertyPath()
     /**
      * @return bool whether an exception is thrown or null is returned when reading a non-existing property
      */
-    public function isExceptionOnInvalidPropertyPath()
+    public function isExceptionOnInvalidPropertyPath(): bool
     {
         return $this->throwExceptionOnInvalidPropertyPath;
     }
@@ -229,7 +229,7 @@ public function isExceptionOnInvalidPropertyPath()
      *
      * @return PropertyAccessorBuilder The builder object
      */
-    public function setCacheItemPool(CacheItemPoolInterface $cacheItemPool = null)
+    public function setCacheItemPool(CacheItemPoolInterface $cacheItemPool = null): self
     {
         $this->cacheItemPool = $cacheItemPool;
 
@@ -238,10 +238,8 @@ public function setCacheItemPool(CacheItemPoolInterface $cacheItemPool = null)
 
     /**
      * Gets the used cache system.
-     *
-     * @return CacheItemPoolInterface|null
      */
-    public function getCacheItemPool()
+    public function getCacheItemPool(): ?CacheItemPoolInterface
     {
         return $this->cacheItemPool;
     }
@@ -249,7 +247,7 @@ public function getCacheItemPool()
     /**
      * @return $this
      */
-    public function setReadInfoExtractor(?PropertyReadInfoExtractorInterface $readInfoExtractor)
+    public function setReadInfoExtractor(?PropertyReadInfoExtractorInterface $readInfoExtractor): static
     {
         $this->readInfoExtractor = $readInfoExtractor;
 
@@ -264,7 +262,7 @@ public function getReadInfoExtractor(): ?PropertyReadInfoExtractorInterface
     /**
      * @return $this
      */
-    public function setWriteInfoExtractor(?PropertyWriteInfoExtractorInterface $writeInfoExtractor)
+    public function setWriteInfoExtractor(?PropertyWriteInfoExtractorInterface $writeInfoExtractor): static
     {
         $this->writeInfoExtractor = $writeInfoExtractor;
 
@@ -281,7 +279,7 @@ public function getWriteInfoExtractor(): ?PropertyWriteInfoExtractorInterface
      *
      * @return PropertyAccessorInterface The built PropertyAccessor
      */
-    public function getPropertyAccessor()
+    public function getPropertyAccessor(): PropertyAccessorInterface
     {
         $throw = PropertyAccessor::DO_NOT_THROW;
 
diff --git a/src/Symfony/Component/PropertyAccess/PropertyAccessorInterface.php b/src/Symfony/Component/PropertyAccess/PropertyAccessorInterface.php
index aeba6a4a55748..8bc234861993a 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyAccessorInterface.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyAccessorInterface.php
@@ -73,7 +73,7 @@ public function setValue(object|array &$objectOrArray, string|PropertyPathInterf
      * @throws Exception\UnexpectedTypeException  If a value within the path is neither object
      *                                            nor array
      */
-    public function getValue(object|array $objectOrArray, string|PropertyPathInterface $propertyPath);
+    public function getValue(object|array $objectOrArray, string|PropertyPathInterface $propertyPath): mixed;
 
     /**
      * Returns whether a value can be written at a given property path.
@@ -85,7 +85,7 @@ public function getValue(object|array $objectOrArray, string|PropertyPathInterfa
      *
      * @throws Exception\InvalidArgumentException If the property path is invalid
      */
-    public function isWritable(object|array $objectOrArray, string|PropertyPathInterface $propertyPath);
+    public function isWritable(object|array $objectOrArray, string|PropertyPathInterface $propertyPath): bool;
 
     /**
      * Returns whether a property path can be read from an object graph.
@@ -97,5 +97,5 @@ public function isWritable(object|array $objectOrArray, string|PropertyPathInter
      *
      * @throws Exception\InvalidArgumentException If the property path is invalid
      */
-    public function isReadable(object|array $objectOrArray, string|PropertyPathInterface $propertyPath);
+    public function isReadable(object|array $objectOrArray, string|PropertyPathInterface $propertyPath): bool;
 }
diff --git a/src/Symfony/Component/PropertyAccess/PropertyPath.php b/src/Symfony/Component/PropertyAccess/PropertyPath.php
index 7feaaa4d573c0..d27a88503e424 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyPath.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyPath.php
@@ -117,7 +117,7 @@ public function __toString(): string
     /**
      * {@inheritdoc}
      */
-    public function getLength()
+    public function getLength(): int
     {
         return $this->length;
     }
@@ -125,7 +125,7 @@ public function getLength()
     /**
      * {@inheritdoc}
      */
-    public function getParent()
+    public function getParent(): ?PropertyPathInterface
     {
         if ($this->length <= 1) {
             return null;
@@ -152,7 +152,7 @@ public function getIterator(): PropertyPathIteratorInterface
     /**
      * {@inheritdoc}
      */
-    public function getElements()
+    public function getElements(): array
     {
         return $this->elements;
     }
@@ -160,7 +160,7 @@ public function getElements()
     /**
      * {@inheritdoc}
      */
-    public function getElement(int $index)
+    public function getElement(int $index): string
     {
         if (!isset($this->elements[$index])) {
             throw new OutOfBoundsException(sprintf('The index "%s" is not within the property path.', $index));
@@ -172,7 +172,7 @@ public function getElement(int $index)
     /**
      * {@inheritdoc}
      */
-    public function isProperty(int $index)
+    public function isProperty(int $index): bool
     {
         if (!isset($this->isIndex[$index])) {
             throw new OutOfBoundsException(sprintf('The index "%s" is not within the property path.', $index));
@@ -184,7 +184,7 @@ public function isProperty(int $index)
     /**
      * {@inheritdoc}
      */
-    public function isIndex(int $index)
+    public function isIndex(int $index): bool
     {
         if (!isset($this->isIndex[$index])) {
             throw new OutOfBoundsException(sprintf('The index "%s" is not within the property path.', $index));
diff --git a/src/Symfony/Component/PropertyAccess/PropertyPathBuilder.php b/src/Symfony/Component/PropertyAccess/PropertyPathBuilder.php
index 3749b00739c2e..6675b92559935 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyPathBuilder.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyPathBuilder.php
@@ -158,7 +158,7 @@ public function replaceByProperty(int $offset, string $name = null)
      *
      * @return int The path length
      */
-    public function getLength()
+    public function getLength(): int
     {
         return \count($this->elements);
     }
@@ -168,7 +168,7 @@ public function getLength()
      *
      * @return PropertyPathInterface|null The constructed property path
      */
-    public function getPropertyPath()
+    public function getPropertyPath(): ?PropertyPathInterface
     {
         $pathAsString = $this->__toString();
 
diff --git a/src/Symfony/Component/PropertyAccess/PropertyPathIterator.php b/src/Symfony/Component/PropertyAccess/PropertyPathIterator.php
index 3445db2cb0dc4..6b27c86b81c57 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyPathIterator.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyPathIterator.php
@@ -31,7 +31,7 @@ public function __construct(PropertyPathInterface $path)
     /**
      * {@inheritdoc}
      */
-    public function isIndex()
+    public function isIndex(): bool
     {
         return $this->path->isIndex($this->key());
     }
@@ -39,7 +39,7 @@ public function isIndex()
     /**
      * {@inheritdoc}
      */
-    public function isProperty()
+    public function isProperty(): bool
     {
         return $this->path->isProperty($this->key());
     }
diff --git a/src/Symfony/Component/PropertyAccess/PropertyPathIteratorInterface.php b/src/Symfony/Component/PropertyAccess/PropertyPathIteratorInterface.php
index 79b1bbfe828e4..8295e67fcbf15 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyPathIteratorInterface.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyPathIteratorInterface.php
@@ -19,16 +19,12 @@ interface PropertyPathIteratorInterface extends \Iterator, \SeekableIterator
     /**
      * Returns whether the current element in the property path is an array
      * index.
-     *
-     * @return bool
      */
-    public function isIndex();
+    public function isIndex(): bool;
 
     /**
      * Returns whether the current element in the property path is a property
      * name.
-     *
-     * @return bool
      */
-    public function isProperty();
+    public function isProperty(): bool;
 }
diff --git a/src/Symfony/Component/PropertyInfo/PropertyDescriptionExtractorInterface.php b/src/Symfony/Component/PropertyInfo/PropertyDescriptionExtractorInterface.php
index f376537537062..a779d159cd757 100644
--- a/src/Symfony/Component/PropertyInfo/PropertyDescriptionExtractorInterface.php
+++ b/src/Symfony/Component/PropertyInfo/PropertyDescriptionExtractorInterface.php
@@ -20,15 +20,11 @@ interface PropertyDescriptionExtractorInterface
 {
     /**
      * Gets the short description of the property.
-     *
-     * @return string|null
      */
-    public function getShortDescription(string $class, string $property, array $context = []);
+    public function getShortDescription(string $class, string $property, array $context = []): ?string;
 
     /**
      * Gets the long description of the property.
-     *
-     * @return string|null
      */
-    public function getLongDescription(string $class, string $property, array $context = []);
+    public function getLongDescription(string $class, string $property, array $context = []): ?string;
 }
diff --git a/src/Symfony/Component/Routing/CompiledRoute.php b/src/Symfony/Component/Routing/CompiledRoute.php
index d0d11b31b4b14..6ed65fbee4b1f 100644
--- a/src/Symfony/Component/Routing/CompiledRoute.php
+++ b/src/Symfony/Component/Routing/CompiledRoute.php
@@ -96,7 +96,7 @@ final public function unserialize(string $serialized)
      *
      * @return string The static prefix
      */
-    public function getStaticPrefix()
+    public function getStaticPrefix(): string
     {
         return $this->staticPrefix;
     }
@@ -106,7 +106,7 @@ public function getStaticPrefix()
      *
      * @return string The regex
      */
-    public function getRegex()
+    public function getRegex(): string
     {
         return $this->regex;
     }
@@ -116,7 +116,7 @@ public function getRegex()
      *
      * @return string|null The host regex or null
      */
-    public function getHostRegex()
+    public function getHostRegex(): ?string
     {
         return $this->hostRegex;
     }
@@ -126,7 +126,7 @@ public function getHostRegex()
      *
      * @return array The tokens
      */
-    public function getTokens()
+    public function getTokens(): array
     {
         return $this->tokens;
     }
@@ -136,7 +136,7 @@ public function getTokens()
      *
      * @return array The tokens
      */
-    public function getHostTokens()
+    public function getHostTokens(): array
     {
         return $this->hostTokens;
     }
@@ -146,7 +146,7 @@ public function getHostTokens()
      *
      * @return array The variables
      */
-    public function getVariables()
+    public function getVariables(): array
     {
         return $this->variables;
     }
@@ -156,7 +156,7 @@ public function getVariables()
      *
      * @return array The variables
      */
-    public function getPathVariables()
+    public function getPathVariables(): array
     {
         return $this->pathVariables;
     }
@@ -166,7 +166,7 @@ public function getPathVariables()
      *
      * @return array The variables
      */
-    public function getHostVariables()
+    public function getHostVariables(): array
     {
         return $this->hostVariables;
     }
diff --git a/src/Symfony/Component/Routing/Exception/MethodNotAllowedException.php b/src/Symfony/Component/Routing/Exception/MethodNotAllowedException.php
index 2810ac76b3584..0e4381bb6d997 100644
--- a/src/Symfony/Component/Routing/Exception/MethodNotAllowedException.php
+++ b/src/Symfony/Component/Routing/Exception/MethodNotAllowedException.php
@@ -37,7 +37,7 @@ public function __construct(array $allowedMethods, string $message = '', int $co
      *
      * @return string[]
      */
-    public function getAllowedMethods()
+    public function getAllowedMethods(): array
     {
         return $this->allowedMethods;
     }
diff --git a/src/Symfony/Component/Routing/Generator/CompiledUrlGenerator.php b/src/Symfony/Component/Routing/Generator/CompiledUrlGenerator.php
index 90ce5b2906880..fdd80ecf16e14 100644
--- a/src/Symfony/Component/Routing/Generator/CompiledUrlGenerator.php
+++ b/src/Symfony/Component/Routing/Generator/CompiledUrlGenerator.php
@@ -31,7 +31,7 @@ public function __construct(array $compiledRoutes, RequestContext $context, Logg
         $this->defaultLocale = $defaultLocale;
     }
 
-    public function generate(string $name, array $parameters = [], int $referenceType = self::ABSOLUTE_PATH)
+    public function generate(string $name, array $parameters = [], int $referenceType = self::ABSOLUTE_PATH): string
     {
         $locale = $parameters['_locale']
             ?? $this->context->getParameter('_locale')
diff --git a/src/Symfony/Component/Routing/Generator/ConfigurableRequirementsInterface.php b/src/Symfony/Component/Routing/Generator/ConfigurableRequirementsInterface.php
index 568f7f775300a..2c99c913a3022 100644
--- a/src/Symfony/Component/Routing/Generator/ConfigurableRequirementsInterface.php
+++ b/src/Symfony/Component/Routing/Generator/ConfigurableRequirementsInterface.php
@@ -46,8 +46,6 @@ public function setStrictRequirements(?bool $enabled);
     /**
      * Returns whether to throw an exception on incorrect parameters.
      * Null means the requirements check is deactivated completely.
-     *
-     * @return bool|null
      */
-    public function isStrictRequirements();
+    public function isStrictRequirements(): ?bool;
 }
diff --git a/src/Symfony/Component/Routing/Generator/Dumper/CompiledUrlGeneratorDumper.php b/src/Symfony/Component/Routing/Generator/Dumper/CompiledUrlGeneratorDumper.php
index e90a40a26f0fc..025972e6e54c6 100644
--- a/src/Symfony/Component/Routing/Generator/Dumper/CompiledUrlGeneratorDumper.php
+++ b/src/Symfony/Component/Routing/Generator/Dumper/CompiledUrlGeneratorDumper.php
@@ -44,7 +44,7 @@ public function getCompiledRoutes(): array
     /**
      * {@inheritdoc}
      */
-    public function dump(array $options = [])
+    public function dump(array $options = []): string
     {
         return <<<EOF
 <?php
diff --git a/src/Symfony/Component/Routing/Generator/Dumper/GeneratorDumper.php b/src/Symfony/Component/Routing/Generator/Dumper/GeneratorDumper.php
index 659c5ba1c8074..e15a985df03c8 100644
--- a/src/Symfony/Component/Routing/Generator/Dumper/GeneratorDumper.php
+++ b/src/Symfony/Component/Routing/Generator/Dumper/GeneratorDumper.php
@@ -30,7 +30,7 @@ public function __construct(RouteCollection $routes)
     /**
      * {@inheritdoc}
      */
-    public function getRoutes()
+    public function getRoutes(): RouteCollection
     {
         return $this->routes;
     }
diff --git a/src/Symfony/Component/Routing/Generator/Dumper/GeneratorDumperInterface.php b/src/Symfony/Component/Routing/Generator/Dumper/GeneratorDumperInterface.php
index 1fb96a23ec727..750f96e2620e1 100644
--- a/src/Symfony/Component/Routing/Generator/Dumper/GeneratorDumperInterface.php
+++ b/src/Symfony/Component/Routing/Generator/Dumper/GeneratorDumperInterface.php
@@ -26,12 +26,10 @@ interface GeneratorDumperInterface
      *
      * @return string Executable code
      */
-    public function dump(array $options = []);
+    public function dump(array $options = []): string;
 
     /**
      * Gets the routes to dump.
-     *
-     * @return RouteCollection
      */
-    public function getRoutes();
+    public function getRoutes(): RouteCollection;
 }
diff --git a/src/Symfony/Component/Routing/Generator/UrlGenerator.php b/src/Symfony/Component/Routing/Generator/UrlGenerator.php
index 8fd2550a49e9e..eab3c1e210daa 100644
--- a/src/Symfony/Component/Routing/Generator/UrlGenerator.php
+++ b/src/Symfony/Component/Routing/Generator/UrlGenerator.php
@@ -101,7 +101,7 @@ public function setContext(RequestContext $context)
     /**
      * {@inheritdoc}
      */
-    public function getContext()
+    public function getContext(): RequestContext
     {
         return $this->context;
     }
@@ -117,7 +117,7 @@ public function setStrictRequirements(?bool $enabled)
     /**
      * {@inheritdoc}
      */
-    public function isStrictRequirements()
+    public function isStrictRequirements(): ?bool
     {
         return $this->strictRequirements;
     }
@@ -125,7 +125,7 @@ public function isStrictRequirements()
     /**
      * {@inheritdoc}
      */
-    public function generate(string $name, array $parameters = [], int $referenceType = self::ABSOLUTE_PATH)
+    public function generate(string $name, array $parameters = [], int $referenceType = self::ABSOLUTE_PATH): string
     {
         $route = null;
         $locale = $parameters['_locale']
@@ -165,10 +165,8 @@ public function generate(string $name, array $parameters = [], int $referenceTyp
      * @throws MissingMandatoryParametersException When some parameters are missing that are mandatory for the route
      * @throws InvalidParameterException           When a parameter value for a placeholder is not correct because
      *                                             it does not match the requirement
-     *
-     * @return string
      */
-    protected function doGenerate(array $variables, array $defaults, array $requirements, array $tokens, array $parameters, string $name, int $referenceType, array $hostTokens, array $requiredSchemes = [])
+    protected function doGenerate(array $variables, array $defaults, array $requirements, array $tokens, array $parameters, string $name, int $referenceType, array $hostTokens, array $requiredSchemes = []): string
     {
         $variables = array_flip($variables);
         $mergedParams = array_replace($defaults, $this->context->getParameters(), $parameters);
@@ -334,7 +332,7 @@ protected function doGenerate(array $variables, array $defaults, array $requirem
      *
      * @return string The relative target path
      */
-    public static function getRelativePath(string $basePath, string $targetPath)
+    public static function getRelativePath(string $basePath, string $targetPath): string
     {
         if ($basePath === $targetPath) {
             return '';
diff --git a/src/Symfony/Component/Routing/Generator/UrlGeneratorInterface.php b/src/Symfony/Component/Routing/Generator/UrlGeneratorInterface.php
index c641e81511241..2409e1270e7cb 100644
--- a/src/Symfony/Component/Routing/Generator/UrlGeneratorInterface.php
+++ b/src/Symfony/Component/Routing/Generator/UrlGeneratorInterface.php
@@ -78,5 +78,5 @@ interface UrlGeneratorInterface extends RequestContextAwareInterface
      * @throws InvalidParameterException           When a parameter value for a placeholder is not correct because
      *                                             it does not match the requirement
      */
-    public function generate(string $name, array $parameters = [], int $referenceType = self::ABSOLUTE_PATH);
+    public function generate(string $name, array $parameters = [], int $referenceType = self::ABSOLUTE_PATH): string;
 }
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
index 932c31890d438..efa597e5dc3ab 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
@@ -106,7 +106,7 @@ public function setRouteAnnotationClass(string $class)
      *
      * @throws \InvalidArgumentException When route can't be parsed
      */
-    public function load(mixed $class, string $type = null)
+    public function load(mixed $class, string $type = null): RouteCollection
     {
         if (!class_exists($class)) {
             throw new \InvalidArgumentException(sprintf('Class "%s" does not exist.', $class));
@@ -237,7 +237,7 @@ protected function addRoute(RouteCollection $collection, object $annot, array $g
     /**
      * {@inheritdoc}
      */
-    public function supports(mixed $resource, string $type = null)
+    public function supports(mixed $resource, string $type = null): bool
     {
         return \is_string($resource) && preg_match('/^(?:\\\\?[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)+$/', $resource) && (!$type || 'annotation' === $type);
     }
@@ -252,7 +252,7 @@ public function setResolver(LoaderResolverInterface $resolver)
     /**
      * {@inheritdoc}
      */
-    public function getResolver()
+    public function getResolver(): LoaderResolverInterface
     {
     }
 
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php
index fab194634b91d..6468c3989d7fa 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php
@@ -27,7 +27,7 @@ class AnnotationDirectoryLoader extends AnnotationFileLoader
      *
      * @throws \InvalidArgumentException When the directory does not exist or its routes cannot be parsed
      */
-    public function load(mixed $path, string $type = null)
+    public function load(mixed $path, string $type = null): RouteCollection
     {
         if (!is_dir($dir = $this->locator->locate($path))) {
             return parent::supports($path, $type) ? parent::load($path, $type) : new RouteCollection();
@@ -69,7 +69,7 @@ function (\SplFileInfo $current) {
     /**
      * {@inheritdoc}
      */
-    public function supports(mixed $resource, string $type = null)
+    public function supports(mixed $resource, string $type = null): bool
     {
         if ('annotation' === $type) {
             return true;
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
index f0af0630b79f1..8dfacc123b96f 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
@@ -44,7 +44,7 @@ public function __construct(FileLocatorInterface $locator, AnnotationClassLoader
      *
      * @throws \InvalidArgumentException When the file does not exist or its routes cannot be parsed
      */
-    public function load(mixed $file, string $type = null)
+    public function load(mixed $file, string $type = null): ?RouteCollection
     {
         $path = $this->locator->locate($file);
 
@@ -67,7 +67,7 @@ public function load(mixed $file, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports(mixed $resource, string $type = null)
+    public function supports(mixed $resource, string $type = null): bool
     {
         return \is_string($resource) && 'php' === pathinfo($resource, \PATHINFO_EXTENSION) && (!$type || 'annotation' === $type);
     }
@@ -77,7 +77,7 @@ public function supports(mixed $resource, string $type = null)
      *
      * @return string|false Full class name if found, false otherwise
      */
-    protected function findClass(string $file)
+    protected function findClass(string $file): string|false
     {
         $class = false;
         $namespace = false;
diff --git a/src/Symfony/Component/Routing/Loader/ClosureLoader.php b/src/Symfony/Component/Routing/Loader/ClosureLoader.php
index ce0a691f57cce..6923fbbec78a9 100644
--- a/src/Symfony/Component/Routing/Loader/ClosureLoader.php
+++ b/src/Symfony/Component/Routing/Loader/ClosureLoader.php
@@ -28,7 +28,7 @@ class ClosureLoader extends Loader
      *
      * @return RouteCollection
      */
-    public function load(mixed $closure, string $type = null)
+    public function load(mixed $closure, string $type = null): RouteCollection
     {
         return $closure($this->env);
     }
@@ -36,7 +36,7 @@ public function load(mixed $closure, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports(mixed $resource, string $type = null)
+    public function supports(mixed $resource, string $type = null): bool
     {
         return $resource instanceof \Closure && (!$type || 'closure' === $type);
     }
diff --git a/src/Symfony/Component/Routing/Loader/Configurator/CollectionConfigurator.php b/src/Symfony/Component/Routing/Loader/Configurator/CollectionConfigurator.php
index 713e4337a0426..bd433cd8f66f6 100644
--- a/src/Symfony/Component/Routing/Loader/Configurator/CollectionConfigurator.php
+++ b/src/Symfony/Component/Routing/Loader/Configurator/CollectionConfigurator.php
@@ -41,7 +41,7 @@ public function __construct(RouteCollection $parent, string $name, self $parentC
     /**
      * @return array
      */
-    public function __sleep()
+    public function __sleep(): array
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
     }
diff --git a/src/Symfony/Component/Routing/Loader/Configurator/ImportConfigurator.php b/src/Symfony/Component/Routing/Loader/Configurator/ImportConfigurator.php
index 664a0d4fadf7f..c846cfc578d89 100644
--- a/src/Symfony/Component/Routing/Loader/Configurator/ImportConfigurator.php
+++ b/src/Symfony/Component/Routing/Loader/Configurator/ImportConfigurator.php
@@ -33,7 +33,7 @@ public function __construct(RouteCollection $parent, RouteCollection $route)
     /**
      * @return array
      */
-    public function __sleep()
+    public function __sleep(): array
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
     }
diff --git a/src/Symfony/Component/Routing/Loader/ContainerLoader.php b/src/Symfony/Component/Routing/Loader/ContainerLoader.php
index 2f2511f4e75f8..2476ec1e2f878 100644
--- a/src/Symfony/Component/Routing/Loader/ContainerLoader.php
+++ b/src/Symfony/Component/Routing/Loader/ContainerLoader.php
@@ -31,7 +31,7 @@ public function __construct(ContainerInterface $container, string $env = null)
     /**
      * {@inheritdoc}
      */
-    public function supports(mixed $resource, string $type = null)
+    public function supports(mixed $resource, string $type = null): bool
     {
         return 'service' === $type && \is_string($resource);
     }
@@ -39,7 +39,7 @@ public function supports(mixed $resource, string $type = null)
     /**
      * {@inheritdoc}
      */
-    protected function getObject(string $id)
+    protected function getObject(string $id): object
     {
         return $this->container->get($id);
     }
diff --git a/src/Symfony/Component/Routing/Loader/DirectoryLoader.php b/src/Symfony/Component/Routing/Loader/DirectoryLoader.php
index 78a0d1a78a3aa..4ccbb7b8891aa 100644
--- a/src/Symfony/Component/Routing/Loader/DirectoryLoader.php
+++ b/src/Symfony/Component/Routing/Loader/DirectoryLoader.php
@@ -20,7 +20,7 @@ class DirectoryLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    public function load(mixed $file, string $type = null)
+    public function load(mixed $file, string $type = null): mixed
     {
         $path = $this->locator->locate($file);
 
@@ -49,7 +49,7 @@ public function load(mixed $file, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports(mixed $resource, string $type = null)
+    public function supports(mixed $resource, string $type = null): bool
     {
         // only when type is forced to directory, not to conflict with AnnotationLoader
 
diff --git a/src/Symfony/Component/Routing/Loader/GlobFileLoader.php b/src/Symfony/Component/Routing/Loader/GlobFileLoader.php
index 8bc36030be947..3cf49ccff7e1e 100644
--- a/src/Symfony/Component/Routing/Loader/GlobFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/GlobFileLoader.php
@@ -24,7 +24,7 @@ class GlobFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    public function load(mixed $resource, string $type = null)
+    public function load(mixed $resource, string $type = null): mixed
     {
         $collection = new RouteCollection();
 
@@ -40,7 +40,7 @@ public function load(mixed $resource, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports(mixed $resource, string $type = null)
+    public function supports(mixed $resource, string $type = null): bool
     {
         return 'glob' === $type;
     }
diff --git a/src/Symfony/Component/Routing/Loader/ObjectLoader.php b/src/Symfony/Component/Routing/Loader/ObjectLoader.php
index 3ac3e5f076ef8..3166922888302 100644
--- a/src/Symfony/Component/Routing/Loader/ObjectLoader.php
+++ b/src/Symfony/Component/Routing/Loader/ObjectLoader.php
@@ -30,14 +30,14 @@ abstract class ObjectLoader extends Loader
      *
      * @return object
      */
-    abstract protected function getObject(string $id);
+    abstract protected function getObject(string $id): object;
 
     /**
      * Calls the object method that will load the routes.
      *
      * @return RouteCollection
      */
-    public function load(mixed $resource, string $type = null)
+    public function load(mixed $resource, string $type = null): RouteCollection
     {
         if (!preg_match('/^[^\:]+(?:::(?:[^\:]+))?$/', $resource)) {
             throw new \InvalidArgumentException(sprintf('Invalid resource "%s" passed to the %s route loader: use the format "object_id::method" or "object_id" if your object class has an "__invoke" method.', $resource, \is_string($type) ? '"'.$type.'"' : 'object'));
diff --git a/src/Symfony/Component/Routing/Loader/PhpFileLoader.php b/src/Symfony/Component/Routing/Loader/PhpFileLoader.php
index 5fada100afebe..cc7ff84cda391 100644
--- a/src/Symfony/Component/Routing/Loader/PhpFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/PhpFileLoader.php
@@ -32,7 +32,7 @@ class PhpFileLoader extends FileLoader
      *
      * @return RouteCollection
      */
-    public function load(mixed $file, string $type = null)
+    public function load(mixed $file, string $type = null): RouteCollection
     {
         $path = $this->locator->locate($file);
         $this->setCurrentDir(\dirname($path));
@@ -59,7 +59,7 @@ public function load(mixed $file, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports(mixed $resource, string $type = null)
+    public function supports(mixed $resource, string $type = null): bool
     {
         return \is_string($resource) && 'php' === pathinfo($resource, \PATHINFO_EXTENSION) && (!$type || 'php' === $type);
     }
diff --git a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
index b1b028c40103e..4d5f9bb28df48 100644
--- a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
@@ -40,7 +40,7 @@ class XmlFileLoader extends FileLoader
      * @throws \InvalidArgumentException when the file cannot be loaded or when the XML cannot be
      *                                   parsed because it does not validate against the scheme
      */
-    public function load(mixed $file, string $type = null)
+    public function load(mixed $file, string $type = null): RouteCollection
     {
         $path = $this->locator->locate($file);
 
@@ -97,7 +97,7 @@ protected function parseNode(RouteCollection $collection, \DOMElement $node, str
     /**
      * {@inheritdoc}
      */
-    public function supports(mixed $resource, string $type = null)
+    public function supports(mixed $resource, string $type = null): bool
     {
         return \is_string($resource) && 'xml' === pathinfo($resource, \PATHINFO_EXTENSION) && (!$type || 'xml' === $type);
     }
@@ -220,7 +220,7 @@ protected function parseImport(RouteCollection $collection, \DOMElement $node, s
      *                                   or when the XML structure is not as expected by the scheme -
      *                                   see validate()
      */
-    protected function loadFile(string $file)
+    protected function loadFile(string $file): \DOMDocument
     {
         return XmlUtils::loadFile($file, __DIR__.static::SCHEME_PATH);
     }
diff --git a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
index 3f65c0714ed31..d418077702abb 100644
--- a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
@@ -43,7 +43,7 @@ class YamlFileLoader extends FileLoader
      *
      * @throws \InvalidArgumentException When a route can't be parsed because YAML is invalid
      */
-    public function load(mixed $file, string $type = null)
+    public function load(mixed $file, string $type = null): RouteCollection
     {
         $path = $this->locator->locate($file);
 
@@ -112,7 +112,7 @@ public function load(mixed $file, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports(mixed $resource, string $type = null)
+    public function supports(mixed $resource, string $type = null): bool
     {
         return \is_string($resource) && \in_array(pathinfo($resource, \PATHINFO_EXTENSION), ['yml', 'yaml'], true) && (!$type || 'yaml' === $type);
     }
diff --git a/src/Symfony/Component/Routing/Matcher/Dumper/CompiledUrlMatcherDumper.php b/src/Symfony/Component/Routing/Matcher/Dumper/CompiledUrlMatcherDumper.php
index a3535cdda4a4d..28fe2e8353e7d 100644
--- a/src/Symfony/Component/Routing/Matcher/Dumper/CompiledUrlMatcherDumper.php
+++ b/src/Symfony/Component/Routing/Matcher/Dumper/CompiledUrlMatcherDumper.php
@@ -37,7 +37,7 @@ class CompiledUrlMatcherDumper extends MatcherDumper
     /**
      * {@inheritdoc}
      */
-    public function dump(array $options = [])
+    public function dump(array $options = []): string
     {
         return <<<EOF
 <?php
diff --git a/src/Symfony/Component/Routing/Matcher/Dumper/MatcherDumper.php b/src/Symfony/Component/Routing/Matcher/Dumper/MatcherDumper.php
index ea51ab4063047..fa1e6244c237e 100644
--- a/src/Symfony/Component/Routing/Matcher/Dumper/MatcherDumper.php
+++ b/src/Symfony/Component/Routing/Matcher/Dumper/MatcherDumper.php
@@ -30,7 +30,7 @@ public function __construct(RouteCollection $routes)
     /**
      * {@inheritdoc}
      */
-    public function getRoutes()
+    public function getRoutes(): RouteCollection
     {
         return $this->routes;
     }
diff --git a/src/Symfony/Component/Routing/Matcher/Dumper/MatcherDumperInterface.php b/src/Symfony/Component/Routing/Matcher/Dumper/MatcherDumperInterface.php
index 1e22e1cdab18d..c8438c5ab4a7e 100644
--- a/src/Symfony/Component/Routing/Matcher/Dumper/MatcherDumperInterface.php
+++ b/src/Symfony/Component/Routing/Matcher/Dumper/MatcherDumperInterface.php
@@ -26,12 +26,12 @@ interface MatcherDumperInterface
      *
      * @return string Executable code
      */
-    public function dump(array $options = []);
+    public function dump(array $options = []): string;
 
     /**
      * Gets the routes to dump.
      *
      * @return RouteCollection
      */
-    public function getRoutes();
+    public function getRoutes(): RouteCollection;
 }
diff --git a/src/Symfony/Component/Routing/Matcher/ExpressionLanguageProvider.php b/src/Symfony/Component/Routing/Matcher/ExpressionLanguageProvider.php
index 96bb7babf2076..c9703d236fd27 100644
--- a/src/Symfony/Component/Routing/Matcher/ExpressionLanguageProvider.php
+++ b/src/Symfony/Component/Routing/Matcher/ExpressionLanguageProvider.php
@@ -32,7 +32,7 @@ public function __construct(ServiceProviderInterface $functions)
     /**
      * {@inheritdoc}
      */
-    public function getFunctions()
+    public function getFunctions(): array
     {
         $functions = [];
 
diff --git a/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcher.php b/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcher.php
index 3cd7c81a6cb1d..439c69eeb3a86 100644
--- a/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcher.php
@@ -22,7 +22,7 @@ abstract class RedirectableUrlMatcher extends UrlMatcher implements Redirectable
     /**
      * {@inheritdoc}
      */
-    public function match(string $pathinfo)
+    public function match(string $pathinfo): array
     {
         try {
             return parent::match($pathinfo);
diff --git a/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcherInterface.php b/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcherInterface.php
index 144945d96796c..7bbcc6973fb02 100644
--- a/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcherInterface.php
+++ b/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcherInterface.php
@@ -27,5 +27,5 @@ interface RedirectableUrlMatcherInterface
      *
      * @return array An array of parameters
      */
-    public function redirect(string $path, string $route, string $scheme = null);
+    public function redirect(string $path, string $route, string $scheme = null): array;
 }
diff --git a/src/Symfony/Component/Routing/Matcher/RequestMatcherInterface.php b/src/Symfony/Component/Routing/Matcher/RequestMatcherInterface.php
index 0c193ff2d1f06..c08dbb69b45c4 100644
--- a/src/Symfony/Component/Routing/Matcher/RequestMatcherInterface.php
+++ b/src/Symfony/Component/Routing/Matcher/RequestMatcherInterface.php
@@ -35,5 +35,5 @@ interface RequestMatcherInterface
      * @throws ResourceNotFoundException If no matching resource could be found
      * @throws MethodNotAllowedException If a matching resource was found but the request method is not allowed
      */
-    public function matchRequest(Request $request);
+    public function matchRequest(Request $request): array;
 }
diff --git a/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php b/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
index 9e8c4c42df044..af6678c3f0680 100644
--- a/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
@@ -50,7 +50,7 @@ public function getTracesForRequest(Request $request)
         return $traces;
     }
 
-    protected function matchCollection(string $pathinfo, RouteCollection $routes)
+    protected function matchCollection(string $pathinfo, RouteCollection $routes): array
     {
         // HEAD and GET are equivalent as per RFC
         if ('HEAD' === $method = $this->context->getMethod()) {
diff --git a/src/Symfony/Component/Routing/Matcher/UrlMatcher.php b/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
index ef9c34a506b3a..7e7c016c51bef 100644
--- a/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
@@ -73,7 +73,7 @@ public function setContext(RequestContext $context)
     /**
      * {@inheritdoc}
      */
-    public function getContext()
+    public function getContext(): RequestContext
     {
         return $this->context;
     }
@@ -81,7 +81,7 @@ public function getContext()
     /**
      * {@inheritdoc}
      */
-    public function match(string $pathinfo)
+    public function match(string $pathinfo): array
     {
         $this->allow = $this->allowSchemes = [];
 
@@ -99,7 +99,7 @@ public function match(string $pathinfo)
     /**
      * {@inheritdoc}
      */
-    public function matchRequest(Request $request)
+    public function matchRequest(Request $request): array
     {
         $this->request = $request;
 
@@ -126,7 +126,7 @@ public function addExpressionLanguageProvider(ExpressionFunctionProviderInterfac
      * @throws ResourceNotFoundException If the resource could not be found
      * @throws MethodNotAllowedException If the resource was found but the request method is not allowed
      */
-    protected function matchCollection(string $pathinfo, RouteCollection $routes)
+    protected function matchCollection(string $pathinfo, RouteCollection $routes): array
     {
         // HEAD and GET are equivalent as per RFC
         if ('HEAD' === $method = $this->context->getMethod()) {
@@ -207,7 +207,7 @@ protected function matchCollection(string $pathinfo, RouteCollection $routes)
      *
      * @return array An array of parameters
      */
-    protected function getAttributes(Route $route, string $name, array $attributes)
+    protected function getAttributes(Route $route, string $name, array $attributes): array
     {
         $defaults = $route->getDefaults();
         if (isset($defaults['_canonical_route'])) {
@@ -224,7 +224,7 @@ protected function getAttributes(Route $route, string $name, array $attributes)
      *
      * @return array The first element represents the status, the second contains additional information
      */
-    protected function handleRouteRequirements(string $pathinfo, string $name, Route $route)
+    protected function handleRouteRequirements(string $pathinfo, string $name, Route $route): array
     {
         // expression condition
         if ($route->getCondition() && !$this->getExpressionLanguage()->evaluate($route->getCondition(), ['context' => $this->context, 'request' => $this->request ?: $this->createRequest($pathinfo)])) {
@@ -239,7 +239,7 @@ protected function handleRouteRequirements(string $pathinfo, string $name, Route
      *
      * @return array Merged default parameters
      */
-    protected function mergeDefaults(array $params, array $defaults)
+    protected function mergeDefaults(array $params, array $defaults): array
     {
         foreach ($params as $key => $value) {
             if (!\is_int($key) && null !== $value) {
diff --git a/src/Symfony/Component/Routing/Matcher/UrlMatcherInterface.php b/src/Symfony/Component/Routing/Matcher/UrlMatcherInterface.php
index 24f23e381fa50..3a33dc9772e64 100644
--- a/src/Symfony/Component/Routing/Matcher/UrlMatcherInterface.php
+++ b/src/Symfony/Component/Routing/Matcher/UrlMatcherInterface.php
@@ -37,5 +37,5 @@ interface UrlMatcherInterface extends RequestContextAwareInterface
      * @throws ResourceNotFoundException If the resource could not be found
      * @throws MethodNotAllowedException If the resource was found but the request method is not allowed
      */
-    public function match(string $pathinfo);
+    public function match(string $pathinfo): array;
 }
diff --git a/src/Symfony/Component/Routing/RequestContext.php b/src/Symfony/Component/Routing/RequestContext.php
index 60767904c0b89..a4ff4754629de 100644
--- a/src/Symfony/Component/Routing/RequestContext.php
+++ b/src/Symfony/Component/Routing/RequestContext.php
@@ -67,7 +67,7 @@ public static function fromUri(string $uri, string $host = 'localhost', string $
      *
      * @return $this
      */
-    public function fromRequest(Request $request)
+    public function fromRequest(Request $request): static
     {
         $this->setBaseUrl($request->getBaseUrl());
         $this->setPathInfo($request->getPathInfo());
@@ -86,7 +86,7 @@ public function fromRequest(Request $request)
      *
      * @return string The base URL
      */
-    public function getBaseUrl()
+    public function getBaseUrl(): string
     {
         return $this->baseUrl;
     }
@@ -96,7 +96,7 @@ public function getBaseUrl()
      *
      * @return $this
      */
-    public function setBaseUrl(string $baseUrl)
+    public function setBaseUrl(string $baseUrl): static
     {
         $this->baseUrl = $baseUrl;
 
@@ -108,7 +108,7 @@ public function setBaseUrl(string $baseUrl)
      *
      * @return string The path info
      */
-    public function getPathInfo()
+    public function getPathInfo(): string
     {
         return $this->pathInfo;
     }
@@ -118,7 +118,7 @@ public function getPathInfo()
      *
      * @return $this
      */
-    public function setPathInfo(string $pathInfo)
+    public function setPathInfo(string $pathInfo): static
     {
         $this->pathInfo = $pathInfo;
 
@@ -132,7 +132,7 @@ public function setPathInfo(string $pathInfo)
      *
      * @return string The HTTP method
      */
-    public function getMethod()
+    public function getMethod(): string
     {
         return $this->method;
     }
@@ -142,7 +142,7 @@ public function getMethod()
      *
      * @return $this
      */
-    public function setMethod(string $method)
+    public function setMethod(string $method): static
     {
         $this->method = strtoupper($method);
 
@@ -156,7 +156,7 @@ public function setMethod(string $method)
      *
      * @return string The HTTP host
      */
-    public function getHost()
+    public function getHost(): string
     {
         return $this->host;
     }
@@ -166,7 +166,7 @@ public function getHost()
      *
      * @return $this
      */
-    public function setHost(string $host)
+    public function setHost(string $host): static
     {
         $this->host = strtolower($host);
 
@@ -178,7 +178,7 @@ public function setHost(string $host)
      *
      * @return string The HTTP scheme
      */
-    public function getScheme()
+    public function getScheme(): string
     {
         return $this->scheme;
     }
@@ -188,7 +188,7 @@ public function getScheme()
      *
      * @return $this
      */
-    public function setScheme(string $scheme)
+    public function setScheme(string $scheme): static
     {
         $this->scheme = strtolower($scheme);
 
@@ -200,7 +200,7 @@ public function setScheme(string $scheme)
      *
      * @return int The HTTP port
      */
-    public function getHttpPort()
+    public function getHttpPort(): int
     {
         return $this->httpPort;
     }
@@ -210,7 +210,7 @@ public function getHttpPort()
      *
      * @return $this
      */
-    public function setHttpPort(int $httpPort)
+    public function setHttpPort(int $httpPort): static
     {
         $this->httpPort = $httpPort;
 
@@ -222,7 +222,7 @@ public function setHttpPort(int $httpPort)
      *
      * @return int The HTTPS port
      */
-    public function getHttpsPort()
+    public function getHttpsPort(): int
     {
         return $this->httpsPort;
     }
@@ -232,7 +232,7 @@ public function getHttpsPort()
      *
      * @return $this
      */
-    public function setHttpsPort(int $httpsPort)
+    public function setHttpsPort(int $httpsPort): static
     {
         $this->httpsPort = $httpsPort;
 
@@ -244,7 +244,7 @@ public function setHttpsPort(int $httpsPort)
      *
      * @return string The query string without the "?"
      */
-    public function getQueryString()
+    public function getQueryString(): string
     {
         return $this->queryString;
     }
@@ -254,7 +254,7 @@ public function getQueryString()
      *
      * @return $this
      */
-    public function setQueryString(?string $queryString)
+    public function setQueryString(?string $queryString): static
     {
         // string cast to be fault-tolerant, accepting null
         $this->queryString = (string) $queryString;
@@ -267,7 +267,7 @@ public function setQueryString(?string $queryString)
      *
      * @return array The parameters
      */
-    public function getParameters()
+    public function getParameters(): array
     {
         return $this->parameters;
     }
@@ -279,7 +279,7 @@ public function getParameters()
      *
      * @return $this
      */
-    public function setParameters(array $parameters)
+    public function setParameters(array $parameters): static
     {
         $this->parameters = $parameters;
 
@@ -291,7 +291,7 @@ public function setParameters(array $parameters)
      *
      * @return mixed The parameter value or null if nonexistent
      */
-    public function getParameter(string $name)
+    public function getParameter(string $name): mixed
     {
         return $this->parameters[$name] ?? null;
     }
@@ -301,7 +301,7 @@ public function getParameter(string $name)
      *
      * @return bool True if the parameter value is set, false otherwise
      */
-    public function hasParameter(string $name)
+    public function hasParameter(string $name): bool
     {
         return \array_key_exists($name, $this->parameters);
     }
@@ -311,7 +311,7 @@ public function hasParameter(string $name)
      *
      * @return $this
      */
-    public function setParameter(string $name, mixed $parameter)
+    public function setParameter(string $name, mixed $parameter): static
     {
         $this->parameters[$name] = $parameter;
 
diff --git a/src/Symfony/Component/Routing/RequestContextAwareInterface.php b/src/Symfony/Component/Routing/RequestContextAwareInterface.php
index df5b9fcd4712e..c401d52e2b979 100644
--- a/src/Symfony/Component/Routing/RequestContextAwareInterface.php
+++ b/src/Symfony/Component/Routing/RequestContextAwareInterface.php
@@ -23,5 +23,5 @@ public function setContext(RequestContext $context);
      *
      * @return RequestContext The context
      */
-    public function getContext();
+    public function getContext(): RequestContext;
 }
diff --git a/src/Symfony/Component/Routing/Route.php b/src/Symfony/Component/Routing/Route.php
index fe79369f39fc4..e5bd01aa1fee5 100644
--- a/src/Symfony/Component/Routing/Route.php
+++ b/src/Symfony/Component/Routing/Route.php
@@ -114,7 +114,7 @@ final public function unserialize(string $serialized)
     /**
      * @return string The path pattern
      */
-    public function getPath()
+    public function getPath(): string
     {
         return $this->path;
     }
@@ -122,7 +122,7 @@ public function getPath()
     /**
      * @return $this
      */
-    public function setPath(string $pattern)
+    public function setPath(string $pattern): static
     {
         $pattern = $this->extractInlineDefaultsAndRequirements($pattern);
 
@@ -137,7 +137,7 @@ public function setPath(string $pattern)
     /**
      * @return string The host pattern
      */
-    public function getHost()
+    public function getHost(): string
     {
         return $this->host;
     }
@@ -145,7 +145,7 @@ public function getHost()
     /**
      * @return $this
      */
-    public function setHost(?string $pattern)
+    public function setHost(?string $pattern): static
     {
         $this->host = $this->extractInlineDefaultsAndRequirements((string) $pattern);
         $this->compiled = null;
@@ -159,7 +159,7 @@ public function setHost(?string $pattern)
      *
      * @return string[] The schemes
      */
-    public function getSchemes()
+    public function getSchemes(): array
     {
         return $this->schemes;
     }
@@ -172,7 +172,7 @@ public function getSchemes()
      *
      * @return $this
      */
-    public function setSchemes(string|array $schemes)
+    public function setSchemes(string|array $schemes): static
     {
         $this->schemes = array_map('strtolower', (array) $schemes);
         $this->compiled = null;
@@ -185,7 +185,7 @@ public function setSchemes(string|array $schemes)
      *
      * @return bool true if the scheme requirement exists, otherwise false
      */
-    public function hasScheme(string $scheme)
+    public function hasScheme(string $scheme): bool
     {
         return \in_array(strtolower($scheme), $this->schemes, true);
     }
@@ -196,7 +196,7 @@ public function hasScheme(string $scheme)
      *
      * @return string[] The methods
      */
-    public function getMethods()
+    public function getMethods(): array
     {
         return $this->methods;
     }
@@ -209,7 +209,7 @@ public function getMethods()
      *
      * @return $this
      */
-    public function setMethods(string|array $methods)
+    public function setMethods(string|array $methods): static
     {
         $this->methods = array_map('strtoupper', (array) $methods);
         $this->compiled = null;
@@ -220,7 +220,7 @@ public function setMethods(string|array $methods)
     /**
      * @return array The options
      */
-    public function getOptions()
+    public function getOptions(): array
     {
         return $this->options;
     }
@@ -228,7 +228,7 @@ public function getOptions()
     /**
      * @return $this
      */
-    public function setOptions(array $options)
+    public function setOptions(array $options): static
     {
         $this->options = [
             'compiler_class' => 'Symfony\\Component\\Routing\\RouteCompiler',
@@ -240,7 +240,7 @@ public function setOptions(array $options)
     /**
      * @return $this
      */
-    public function addOptions(array $options)
+    public function addOptions(array $options): static
     {
         foreach ($options as $name => $option) {
             $this->options[$name] = $option;
@@ -255,7 +255,7 @@ public function addOptions(array $options)
      *
      * @return $this
      */
-    public function setOption(string $name, mixed $value)
+    public function setOption(string $name, mixed $value): static
     {
         $this->options[$name] = $value;
         $this->compiled = null;
@@ -266,7 +266,7 @@ public function setOption(string $name, mixed $value)
     /**
      * @return mixed The option value or null when not given
      */
-    public function getOption(string $name)
+    public function getOption(string $name): mixed
     {
         return $this->options[$name] ?? null;
     }
@@ -274,7 +274,7 @@ public function getOption(string $name)
     /**
      * @return bool true if the option is set, false otherwise
      */
-    public function hasOption(string $name)
+    public function hasOption(string $name): bool
     {
         return \array_key_exists($name, $this->options);
     }
@@ -282,7 +282,7 @@ public function hasOption(string $name)
     /**
      * @return array The defaults
      */
-    public function getDefaults()
+    public function getDefaults(): array
     {
         return $this->defaults;
     }
@@ -290,7 +290,7 @@ public function getDefaults()
     /**
      * @return $this
      */
-    public function setDefaults(array $defaults)
+    public function setDefaults(array $defaults): static
     {
         $this->defaults = [];
 
@@ -300,7 +300,7 @@ public function setDefaults(array $defaults)
     /**
      * @return $this
      */
-    public function addDefaults(array $defaults)
+    public function addDefaults(array $defaults): static
     {
         if (isset($defaults['_locale']) && $this->isLocalized()) {
             unset($defaults['_locale']);
@@ -317,7 +317,7 @@ public function addDefaults(array $defaults)
     /**
      * @return mixed The default value or null when not given
      */
-    public function getDefault(string $name)
+    public function getDefault(string $name): mixed
     {
         return $this->defaults[$name] ?? null;
     }
@@ -325,7 +325,7 @@ public function getDefault(string $name)
     /**
      * @return bool true if the default value is set, false otherwise
      */
-    public function hasDefault(string $name)
+    public function hasDefault(string $name): bool
     {
         return \array_key_exists($name, $this->defaults);
     }
@@ -333,7 +333,7 @@ public function hasDefault(string $name)
     /**
      * @return $this
      */
-    public function setDefault(string $name, mixed $default)
+    public function setDefault(string $name, mixed $default): static
     {
         if ('_locale' === $name && $this->isLocalized()) {
             return $this;
@@ -348,7 +348,7 @@ public function setDefault(string $name, mixed $default)
     /**
      * @return array The requirements
      */
-    public function getRequirements()
+    public function getRequirements(): array
     {
         return $this->requirements;
     }
@@ -356,7 +356,7 @@ public function getRequirements()
     /**
      * @return $this
      */
-    public function setRequirements(array $requirements)
+    public function setRequirements(array $requirements): static
     {
         $this->requirements = [];
 
@@ -366,7 +366,7 @@ public function setRequirements(array $requirements)
     /**
      * @return $this
      */
-    public function addRequirements(array $requirements)
+    public function addRequirements(array $requirements): static
     {
         if (isset($requirements['_locale']) && $this->isLocalized()) {
             unset($requirements['_locale']);
@@ -383,7 +383,7 @@ public function addRequirements(array $requirements)
     /**
      * @return string|null The regex or null when not given
      */
-    public function getRequirement(string $key)
+    public function getRequirement(string $key): ?string
     {
         return $this->requirements[$key] ?? null;
     }
@@ -391,7 +391,7 @@ public function getRequirement(string $key)
     /**
      * @return bool true if a requirement is specified, false otherwise
      */
-    public function hasRequirement(string $key)
+    public function hasRequirement(string $key): bool
     {
         return \array_key_exists($key, $this->requirements);
     }
@@ -399,7 +399,7 @@ public function hasRequirement(string $key)
     /**
      * @return $this
      */
-    public function setRequirement(string $key, string $regex)
+    public function setRequirement(string $key, string $regex): static
     {
         if ('_locale' === $key && $this->isLocalized()) {
             return $this;
@@ -414,7 +414,7 @@ public function setRequirement(string $key, string $regex)
     /**
      * @return string The condition
      */
-    public function getCondition()
+    public function getCondition(): string
     {
         return $this->condition;
     }
@@ -422,7 +422,7 @@ public function getCondition()
     /**
      * @return $this
      */
-    public function setCondition(?string $condition)
+    public function setCondition(?string $condition): static
     {
         $this->condition = (string) $condition;
         $this->compiled = null;
@@ -440,7 +440,7 @@ public function setCondition(?string $condition)
      *
      * @see RouteCompiler which is responsible for the compilation process
      */
-    public function compile()
+    public function compile(): CompiledRoute
     {
         if (null !== $this->compiled) {
             return $this->compiled;
diff --git a/src/Symfony/Component/Routing/RouteCollection.php b/src/Symfony/Component/Routing/RouteCollection.php
index c3e99cc65775a..d0dc201084221 100644
--- a/src/Symfony/Component/Routing/RouteCollection.php
+++ b/src/Symfony/Component/Routing/RouteCollection.php
@@ -85,7 +85,7 @@ public function add(string $name, Route $route, int $priority = 0)
      *
      * @return Route[] An array of routes
      */
-    public function all()
+    public function all(): array
     {
         if ($this->priorities) {
             $priorities = $this->priorities;
@@ -103,7 +103,7 @@ public function all()
      *
      * @return Route|null
      */
-    public function get(string $name)
+    public function get(string $name): ?Route
     {
         return $this->routes[$name] ?? null;
     }
@@ -277,7 +277,7 @@ public function setMethods(string|array $methods)
      *
      * @return ResourceInterface[] An array of resources
      */
-    public function getResources()
+    public function getResources(): array
     {
         return array_values($this->resources);
     }
diff --git a/src/Symfony/Component/Routing/RouteCompiler.php b/src/Symfony/Component/Routing/RouteCompiler.php
index 938cec479e3cc..d279a043c8bd4 100644
--- a/src/Symfony/Component/Routing/RouteCompiler.php
+++ b/src/Symfony/Component/Routing/RouteCompiler.php
@@ -47,7 +47,7 @@ class RouteCompiler implements RouteCompilerInterface
      * @throws \DomainException          if a variable name starts with a digit or if it is too long to be successfully used as
      *                                   a PCRE subpattern
      */
-    public static function compile(Route $route)
+    public static function compile(Route $route): CompiledRoute
     {
         $hostVariables = [];
         $variables = [];
diff --git a/src/Symfony/Component/Routing/RouteCompilerInterface.php b/src/Symfony/Component/Routing/RouteCompilerInterface.php
index 9bae33a91430e..4df5410f60390 100644
--- a/src/Symfony/Component/Routing/RouteCompilerInterface.php
+++ b/src/Symfony/Component/Routing/RouteCompilerInterface.php
@@ -26,5 +26,5 @@ interface RouteCompilerInterface
      * @throws \LogicException If the Route cannot be compiled because the
      *                         path or host pattern is invalid
      */
-    public static function compile(Route $route);
+    public static function compile(Route $route): CompiledRoute;
 }
diff --git a/src/Symfony/Component/Routing/Router.php b/src/Symfony/Component/Routing/Router.php
index f455860b362f8..fe5e3d80656c0 100644
--- a/src/Symfony/Component/Routing/Router.php
+++ b/src/Symfony/Component/Routing/Router.php
@@ -170,7 +170,7 @@ public function setOption(string $key, mixed $value)
      *
      * @throws \InvalidArgumentException
      */
-    public function getOption(string $key)
+    public function getOption(string $key): mixed
     {
         if (!\array_key_exists($key, $this->options)) {
             throw new \InvalidArgumentException(sprintf('The Router does not support the "%s" option.', $key));
@@ -209,7 +209,7 @@ public function setContext(RequestContext $context)
     /**
      * {@inheritdoc}
      */
-    public function getContext()
+    public function getContext(): RequestContext
     {
         return $this->context;
     }
@@ -225,7 +225,7 @@ public function setConfigCacheFactory(ConfigCacheFactoryInterface $configCacheFa
     /**
      * {@inheritdoc}
      */
-    public function generate(string $name, array $parameters = [], int $referenceType = self::ABSOLUTE_PATH)
+    public function generate(string $name, array $parameters = [], int $referenceType = self::ABSOLUTE_PATH): string
     {
         return $this->getGenerator()->generate($name, $parameters, $referenceType);
     }
@@ -233,7 +233,7 @@ public function generate(string $name, array $parameters = [], int $referenceTyp
     /**
      * {@inheritdoc}
      */
-    public function match(string $pathinfo)
+    public function match(string $pathinfo): array
     {
         return $this->getMatcher()->match($pathinfo);
     }
@@ -241,7 +241,7 @@ public function match(string $pathinfo)
     /**
      * {@inheritdoc}
      */
-    public function matchRequest(Request $request)
+    public function matchRequest(Request $request): array
     {
         $matcher = $this->getMatcher();
         if (!$matcher instanceof RequestMatcherInterface) {
@@ -257,7 +257,7 @@ public function matchRequest(Request $request)
      *
      * @return UrlMatcherInterface|RequestMatcherInterface
      */
-    public function getMatcher()
+    public function getMatcher(): UrlMatcherInterface|RequestMatcherInterface
     {
         if (null !== $this->matcher) {
             return $this->matcher;
@@ -300,7 +300,7 @@ function (ConfigCacheInterface $cache) {
      *
      * @return UrlGeneratorInterface
      */
-    public function getGenerator()
+    public function getGenerator(): UrlGeneratorInterface
     {
         if (null !== $this->generator) {
             return $this->generator;
@@ -340,7 +340,7 @@ public function addExpressionLanguageProvider(ExpressionFunctionProviderInterfac
     /**
      * @return GeneratorDumperInterface
      */
-    protected function getGeneratorDumperInstance()
+    protected function getGeneratorDumperInstance(): GeneratorDumperInterface
     {
         return new $this->options['generator_dumper_class']($this->getRouteCollection());
     }
@@ -348,7 +348,7 @@ protected function getGeneratorDumperInstance()
     /**
      * @return MatcherDumperInterface
      */
-    protected function getMatcherDumperInstance()
+    protected function getMatcherDumperInstance(): MatcherDumperInterface
     {
         return new $this->options['matcher_dumper_class']($this->getRouteCollection());
     }
diff --git a/src/Symfony/Component/Translation/Catalogue/AbstractOperation.php b/src/Symfony/Component/Translation/Catalogue/AbstractOperation.php
index 9869fbb8bb34e..92a08d3017fa7 100644
--- a/src/Symfony/Component/Translation/Catalogue/AbstractOperation.php
+++ b/src/Symfony/Component/Translation/Catalogue/AbstractOperation.php
@@ -80,7 +80,7 @@ public function __construct(MessageCatalogueInterface $source, MessageCatalogueI
     /**
      * {@inheritdoc}
      */
-    public function getDomains()
+    public function getDomains(): array
     {
         if (null === $this->domains) {
             $this->domains = array_values(array_unique(array_merge($this->source->getDomains(), $this->target->getDomains())));
@@ -92,7 +92,7 @@ public function getDomains()
     /**
      * {@inheritdoc}
      */
-    public function getMessages(string $domain)
+    public function getMessages(string $domain): array
     {
         if (!\in_array($domain, $this->getDomains())) {
             throw new InvalidArgumentException(sprintf('Invalid domain: "%s".', $domain));
@@ -108,7 +108,7 @@ public function getMessages(string $domain)
     /**
      * {@inheritdoc}
      */
-    public function getNewMessages(string $domain)
+    public function getNewMessages(string $domain): array
     {
         if (!\in_array($domain, $this->getDomains())) {
             throw new InvalidArgumentException(sprintf('Invalid domain: "%s".', $domain));
@@ -124,7 +124,7 @@ public function getNewMessages(string $domain)
     /**
      * {@inheritdoc}
      */
-    public function getObsoleteMessages(string $domain)
+    public function getObsoleteMessages(string $domain): array
     {
         if (!\in_array($domain, $this->getDomains())) {
             throw new InvalidArgumentException(sprintf('Invalid domain: "%s".', $domain));
@@ -140,7 +140,7 @@ public function getObsoleteMessages(string $domain)
     /**
      * {@inheritdoc}
      */
-    public function getResult()
+    public function getResult(): MessageCatalogueInterface
     {
         foreach ($this->getDomains() as $domain) {
             if (!isset($this->messages[$domain])) {
diff --git a/src/Symfony/Component/Translation/Catalogue/OperationInterface.php b/src/Symfony/Component/Translation/Catalogue/OperationInterface.php
index 9ffac88d28d4d..7d302406d5352 100644
--- a/src/Symfony/Component/Translation/Catalogue/OperationInterface.php
+++ b/src/Symfony/Component/Translation/Catalogue/OperationInterface.php
@@ -39,33 +39,33 @@ interface OperationInterface
      *
      * @return array
      */
-    public function getDomains();
+    public function getDomains(): array;
 
     /**
      * Returns all valid messages ('all') after operation.
      *
      * @return array
      */
-    public function getMessages(string $domain);
+    public function getMessages(string $domain): array;
 
     /**
      * Returns new messages ('new') after operation.
      *
      * @return array
      */
-    public function getNewMessages(string $domain);
+    public function getNewMessages(string $domain): array;
 
     /**
      * Returns obsolete messages ('obsolete') after operation.
      *
      * @return array
      */
-    public function getObsoleteMessages(string $domain);
+    public function getObsoleteMessages(string $domain): array;
 
     /**
      * Returns resulting catalogue ('result').
      *
      * @return MessageCatalogueInterface
      */
-    public function getResult();
+    public function getResult(): MessageCatalogueInterface;
 }
diff --git a/src/Symfony/Component/Translation/Command/XliffLintCommand.php b/src/Symfony/Component/Translation/Command/XliffLintCommand.php
index 64977e5c629ab..26ce70adc61b9 100644
--- a/src/Symfony/Component/Translation/Command/XliffLintCommand.php
+++ b/src/Symfony/Component/Translation/Command/XliffLintCommand.php
@@ -80,7 +80,7 @@ protected function configure()
         ;
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
         $filenames = (array) $input->getArgument('filename');
diff --git a/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php b/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php
index 379130a44b0f5..a5bc68895c1e6 100644
--- a/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php
+++ b/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php
@@ -65,7 +65,7 @@ public function reset()
     /**
      * @return array|Data
      */
-    public function getMessages()
+    public function getMessages(): array|Data
     {
         return $this->data['messages'] ?? [];
     }
diff --git a/src/Symfony/Component/Translation/DataCollectorTranslator.php b/src/Symfony/Component/Translation/DataCollectorTranslator.php
index ca56e46fadc8f..1e069e38119c5 100644
--- a/src/Symfony/Component/Translation/DataCollectorTranslator.php
+++ b/src/Symfony/Component/Translation/DataCollectorTranslator.php
@@ -74,7 +74,7 @@ public function getLocale(): string
     /**
      * {@inheritdoc}
      */
-    public function getCatalogue(string $locale = null)
+    public function getCatalogue(string $locale = null): MessageCatalogueInterface
     {
         return $this->translator->getCatalogue($locale);
     }
@@ -92,7 +92,7 @@ public function getCatalogues(): array
      *
      * @return string[]
      */
-    public function warmUp(string $cacheDir)
+    public function warmUp(string $cacheDir): array
     {
         if ($this->translator instanceof WarmableInterface) {
             return (array) $this->translator->warmUp($cacheDir);
@@ -106,7 +106,7 @@ public function warmUp(string $cacheDir)
      *
      * @return array The fallback locales
      */
-    public function getFallbackLocales()
+    public function getFallbackLocales(): array
     {
         if ($this->translator instanceof Translator || method_exists($this->translator, 'getFallbackLocales')) {
             return $this->translator->getFallbackLocales();
@@ -126,7 +126,7 @@ public function __call(string $method, array $args)
     /**
      * @return array
      */
-    public function getCollectedMessages()
+    public function getCollectedMessages(): array
     {
         return $this->messages;
     }
diff --git a/src/Symfony/Component/Translation/DependencyInjection/TranslatorPathsPass.php b/src/Symfony/Component/Translation/DependencyInjection/TranslatorPathsPass.php
index 99a074e5db92a..c0d527145a7db 100644
--- a/src/Symfony/Component/Translation/DependencyInjection/TranslatorPathsPass.php
+++ b/src/Symfony/Component/Translation/DependencyInjection/TranslatorPathsPass.php
@@ -86,7 +86,7 @@ public function process(ContainerBuilder $container)
         }
     }
 
-    protected function processValue(mixed $value, bool $isRoot = false)
+    protected function processValue(mixed $value, bool $isRoot = false): mixed
     {
         if ($value instanceof Reference) {
             if ((string) $value === $this->translatorServiceId) {
diff --git a/src/Symfony/Component/Translation/Dumper/CsvFileDumper.php b/src/Symfony/Component/Translation/Dumper/CsvFileDumper.php
index 0c8589af81d79..235c8aee0b8fc 100644
--- a/src/Symfony/Component/Translation/Dumper/CsvFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/CsvFileDumper.php
@@ -26,7 +26,7 @@ class CsvFileDumper extends FileDumper
     /**
      * {@inheritdoc}
      */
-    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
+    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string
     {
         $handle = fopen('php://memory', 'r+');
 
@@ -53,7 +53,7 @@ public function setCsvControl(string $delimiter = ';', string $enclosure = '"')
     /**
      * {@inheritdoc}
      */
-    protected function getExtension()
+    protected function getExtension(): string
     {
         return 'csv';
     }
diff --git a/src/Symfony/Component/Translation/Dumper/FileDumper.php b/src/Symfony/Component/Translation/Dumper/FileDumper.php
index e257e722461d0..30eca6616b4ec 100644
--- a/src/Symfony/Component/Translation/Dumper/FileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/FileDumper.php
@@ -89,14 +89,14 @@ public function dump(MessageCatalogue $messages, array $options = [])
      *
      * @return string representation
      */
-    abstract public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []);
+    abstract public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string;
 
     /**
      * Gets the file extension of the dumper.
      *
      * @return string file extension
      */
-    abstract protected function getExtension();
+    abstract protected function getExtension(): string;
 
     /**
      * Gets the relative file path using the template.
diff --git a/src/Symfony/Component/Translation/Dumper/IcuResFileDumper.php b/src/Symfony/Component/Translation/Dumper/IcuResFileDumper.php
index cdc59913b3a3f..b62ea1536ddf1 100644
--- a/src/Symfony/Component/Translation/Dumper/IcuResFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/IcuResFileDumper.php
@@ -28,7 +28,7 @@ class IcuResFileDumper extends FileDumper
     /**
      * {@inheritdoc}
      */
-    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
+    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string
     {
         $data = $indexes = $resources = '';
 
@@ -97,7 +97,7 @@ private function getPosition(string $data)
     /**
      * {@inheritdoc}
      */
-    protected function getExtension()
+    protected function getExtension(): string
     {
         return 'res';
     }
diff --git a/src/Symfony/Component/Translation/Dumper/IniFileDumper.php b/src/Symfony/Component/Translation/Dumper/IniFileDumper.php
index 93c900a4a9fbc..75032be145289 100644
--- a/src/Symfony/Component/Translation/Dumper/IniFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/IniFileDumper.php
@@ -23,7 +23,7 @@ class IniFileDumper extends FileDumper
     /**
      * {@inheritdoc}
      */
-    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
+    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string
     {
         $output = '';
 
@@ -38,7 +38,7 @@ public function formatCatalogue(MessageCatalogue $messages, string $domain, arra
     /**
      * {@inheritdoc}
      */
-    protected function getExtension()
+    protected function getExtension(): string
     {
         return 'ini';
     }
diff --git a/src/Symfony/Component/Translation/Dumper/JsonFileDumper.php b/src/Symfony/Component/Translation/Dumper/JsonFileDumper.php
index 34c0b5694293f..11027303a17e0 100644
--- a/src/Symfony/Component/Translation/Dumper/JsonFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/JsonFileDumper.php
@@ -23,7 +23,7 @@ class JsonFileDumper extends FileDumper
     /**
      * {@inheritdoc}
      */
-    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
+    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string
     {
         $flags = $options['json_encoding'] ?? \JSON_PRETTY_PRINT;
 
@@ -33,7 +33,7 @@ public function formatCatalogue(MessageCatalogue $messages, string $domain, arra
     /**
      * {@inheritdoc}
      */
-    protected function getExtension()
+    protected function getExtension(): string
     {
         return 'json';
     }
diff --git a/src/Symfony/Component/Translation/Dumper/MoFileDumper.php b/src/Symfony/Component/Translation/Dumper/MoFileDumper.php
index 9dc6101cbb66f..08c8f899747ba 100644
--- a/src/Symfony/Component/Translation/Dumper/MoFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/MoFileDumper.php
@@ -24,7 +24,7 @@ class MoFileDumper extends FileDumper
     /**
      * {@inheritdoc}
      */
-    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
+    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string
     {
         $sources = $targets = $sourceOffsets = $targetOffsets = '';
         $offsets = [];
@@ -70,7 +70,7 @@ public function formatCatalogue(MessageCatalogue $messages, string $domain, arra
     /**
      * {@inheritdoc}
      */
-    protected function getExtension()
+    protected function getExtension(): string
     {
         return 'mo';
     }
diff --git a/src/Symfony/Component/Translation/Dumper/PhpFileDumper.php b/src/Symfony/Component/Translation/Dumper/PhpFileDumper.php
index 6163b5297c104..565d893754250 100644
--- a/src/Symfony/Component/Translation/Dumper/PhpFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/PhpFileDumper.php
@@ -23,7 +23,7 @@ class PhpFileDumper extends FileDumper
     /**
      * {@inheritdoc}
      */
-    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
+    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string
     {
         return "<?php\n\nreturn ".var_export($messages->all($domain), true).";\n";
     }
@@ -31,7 +31,7 @@ public function formatCatalogue(MessageCatalogue $messages, string $domain, arra
     /**
      * {@inheritdoc}
      */
-    protected function getExtension()
+    protected function getExtension(): string
     {
         return 'php';
     }
diff --git a/src/Symfony/Component/Translation/Dumper/PoFileDumper.php b/src/Symfony/Component/Translation/Dumper/PoFileDumper.php
index 2f7fc65e9ee36..313e5045875a5 100644
--- a/src/Symfony/Component/Translation/Dumper/PoFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/PoFileDumper.php
@@ -23,7 +23,7 @@ class PoFileDumper extends FileDumper
     /**
      * {@inheritdoc}
      */
-    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
+    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string
     {
         $output = 'msgid ""'."\n";
         $output .= 'msgstr ""'."\n";
@@ -114,7 +114,7 @@ private function getStandardRules(string $id)
     /**
      * {@inheritdoc}
      */
-    protected function getExtension()
+    protected function getExtension(): string
     {
         return 'po';
     }
diff --git a/src/Symfony/Component/Translation/Dumper/QtFileDumper.php b/src/Symfony/Component/Translation/Dumper/QtFileDumper.php
index 406e9f0060b76..819409fc07453 100644
--- a/src/Symfony/Component/Translation/Dumper/QtFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/QtFileDumper.php
@@ -23,7 +23,7 @@ class QtFileDumper extends FileDumper
     /**
      * {@inheritdoc}
      */
-    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
+    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string
     {
         $dom = new \DOMDocument('1.0', 'utf-8');
         $dom->formatOutput = true;
@@ -54,7 +54,7 @@ public function formatCatalogue(MessageCatalogue $messages, string $domain, arra
     /**
      * {@inheritdoc}
      */
-    protected function getExtension()
+    protected function getExtension(): string
     {
         return 'ts';
     }
diff --git a/src/Symfony/Component/Translation/Dumper/XliffFileDumper.php b/src/Symfony/Component/Translation/Dumper/XliffFileDumper.php
index f7dbdcddf5fab..b8a109a41ffe7 100644
--- a/src/Symfony/Component/Translation/Dumper/XliffFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/XliffFileDumper.php
@@ -24,7 +24,7 @@ class XliffFileDumper extends FileDumper
     /**
      * {@inheritdoc}
      */
-    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
+    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string
     {
         $xliffVersion = '1.2';
         if (\array_key_exists('xliff_version', $options)) {
@@ -50,7 +50,7 @@ public function formatCatalogue(MessageCatalogue $messages, string $domain, arra
     /**
      * {@inheritdoc}
      */
-    protected function getExtension()
+    protected function getExtension(): string
     {
         return 'xlf';
     }
diff --git a/src/Symfony/Component/Translation/Dumper/YamlFileDumper.php b/src/Symfony/Component/Translation/Dumper/YamlFileDumper.php
index 0b21e8c830c06..bf7118b364d34 100644
--- a/src/Symfony/Component/Translation/Dumper/YamlFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/YamlFileDumper.php
@@ -33,7 +33,7 @@ public function __construct(string $extension = 'yml')
     /**
      * {@inheritdoc}
      */
-    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = [])
+    public function formatCatalogue(MessageCatalogue $messages, string $domain, array $options = []): string
     {
         if (!class_exists(Yaml::class)) {
             throw new LogicException('Dumping translations in the YAML format requires the Symfony Yaml component.');
@@ -55,7 +55,7 @@ public function formatCatalogue(MessageCatalogue $messages, string $domain, arra
     /**
      * {@inheritdoc}
      */
-    protected function getExtension()
+    protected function getExtension(): string
     {
         return $this->extension;
     }
diff --git a/src/Symfony/Component/Translation/Extractor/AbstractFileExtractor.php b/src/Symfony/Component/Translation/Extractor/AbstractFileExtractor.php
index e92e4e217d532..dfc6d9b887aa6 100644
--- a/src/Symfony/Component/Translation/Extractor/AbstractFileExtractor.php
+++ b/src/Symfony/Component/Translation/Extractor/AbstractFileExtractor.php
@@ -23,7 +23,7 @@ abstract class AbstractFileExtractor
     /**
      * @return iterable
      */
-    protected function extractFiles(string|iterable $resource)
+    protected function extractFiles(string|iterable $resource): iterable
     {
         if (is_iterable($resource)) {
             $files = [];
@@ -51,7 +51,7 @@ private function toSplFileInfo(string $file): \SplFileInfo
      *
      * @throws InvalidArgumentException
      */
-    protected function isFile(string $file)
+    protected function isFile(string $file): bool
     {
         if (!is_file($file)) {
             throw new InvalidArgumentException(sprintf('The "%s" file does not exist.', $file));
diff --git a/src/Symfony/Component/Translation/Extractor/PhpExtractor.php b/src/Symfony/Component/Translation/Extractor/PhpExtractor.php
index 4a061fb3ad20f..837e7d031416e 100644
--- a/src/Symfony/Component/Translation/Extractor/PhpExtractor.php
+++ b/src/Symfony/Component/Translation/Extractor/PhpExtractor.php
@@ -158,7 +158,7 @@ public function setPrefix(string $prefix)
      *
      * @return string|null
      */
-    protected function normalizeToken(mixed $token)
+    protected function normalizeToken(mixed $token): ?string
     {
         if (isset($token[1]) && 'b"' !== $token) {
             return $token[1];
@@ -317,7 +317,7 @@ protected function parseTokens(array $tokens, MessageCatalogue $catalog, string
      *
      * @throws \InvalidArgumentException
      */
-    protected function canBeExtracted(string $file)
+    protected function canBeExtracted(string $file): bool
     {
         return $this->isFile($file) && 'php' === pathinfo($file, \PATHINFO_EXTENSION);
     }
@@ -325,7 +325,7 @@ protected function canBeExtracted(string $file)
     /**
      * {@inheritdoc}
      */
-    protected function extractFromDirectory(string|array $directory)
+    protected function extractFromDirectory(string|array $directory): iterable
     {
         $finder = new Finder();
 
diff --git a/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php b/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php
index 1d82caf26e597..7988cf676351e 100644
--- a/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php
+++ b/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php
@@ -67,7 +67,7 @@ class PhpStringTokenParser
      *
      * @return string The parsed string
      */
-    public static function parse(string $str)
+    public static function parse(string $str): string
     {
         $bLength = 0;
         if ('b' === $str[0]) {
@@ -93,7 +93,7 @@ public static function parse(string $str)
      *
      * @return string String with escape sequences parsed
      */
-    public static function parseEscapeSequences(string $str, string $quote = null)
+    public static function parseEscapeSequences(string $str, string $quote = null): string
     {
         if (null !== $quote) {
             $str = str_replace('\\'.$quote, $quote, $str);
@@ -127,7 +127,7 @@ private static function parseCallback(array $matches): string
      *
      * @return string Parsed string
      */
-    public static function parseDocString(string $startToken, string $str)
+    public static function parseDocString(string $startToken, string $str): string
     {
         // strip last newline (thanks tokenizer for sticking it into the string!)
         $str = preg_replace('~(\r\n|\n|\r)$~', '', $str);
diff --git a/src/Symfony/Component/Translation/Formatter/MessageFormatter.php b/src/Symfony/Component/Translation/Formatter/MessageFormatter.php
index 04079648338c8..68821b1d0795e 100644
--- a/src/Symfony/Component/Translation/Formatter/MessageFormatter.php
+++ b/src/Symfony/Component/Translation/Formatter/MessageFormatter.php
@@ -37,7 +37,7 @@ public function __construct(TranslatorInterface $translator = null, IntlFormatte
     /**
      * {@inheritdoc}
      */
-    public function format(string $message, string $locale, array $parameters = [])
+    public function format(string $message, string $locale, array $parameters = []): string
     {
         if ($this->translator instanceof TranslatorInterface) {
             return $this->translator->trans($message, $parameters, null, $locale);
diff --git a/src/Symfony/Component/Translation/Formatter/MessageFormatterInterface.php b/src/Symfony/Component/Translation/Formatter/MessageFormatterInterface.php
index b85dbfd115c17..6d45785ce89b5 100644
--- a/src/Symfony/Component/Translation/Formatter/MessageFormatterInterface.php
+++ b/src/Symfony/Component/Translation/Formatter/MessageFormatterInterface.php
@@ -26,5 +26,5 @@ interface MessageFormatterInterface
      *
      * @return string
      */
-    public function format(string $message, string $locale, array $parameters = []);
+    public function format(string $message, string $locale, array $parameters = []): string;
 }
diff --git a/src/Symfony/Component/Translation/Loader/ArrayLoader.php b/src/Symfony/Component/Translation/Loader/ArrayLoader.php
index 13c046ee58880..35de9ef547e69 100644
--- a/src/Symfony/Component/Translation/Loader/ArrayLoader.php
+++ b/src/Symfony/Component/Translation/Loader/ArrayLoader.php
@@ -23,7 +23,7 @@ class ArrayLoader implements LoaderInterface
     /**
      * {@inheritdoc}
      */
-    public function load(mixed $resource, string $locale, string $domain = 'messages')
+    public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue
     {
         $resource = $this->flatten($resource);
         $catalogue = new MessageCatalogue($locale);
diff --git a/src/Symfony/Component/Translation/Loader/CsvFileLoader.php b/src/Symfony/Component/Translation/Loader/CsvFileLoader.php
index 8d5d4db9a721f..8acba7a9ad194 100644
--- a/src/Symfony/Component/Translation/Loader/CsvFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/CsvFileLoader.php
@@ -27,7 +27,7 @@ class CsvFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    protected function loadResource(string $resource)
+    protected function loadResource(string $resource): array
     {
         $messages = [];
 
diff --git a/src/Symfony/Component/Translation/Loader/FileLoader.php b/src/Symfony/Component/Translation/Loader/FileLoader.php
index 1e55a8908d1e6..e212cf569dccd 100644
--- a/src/Symfony/Component/Translation/Loader/FileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/FileLoader.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Translation\Loader;
 
+use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
@@ -23,7 +24,7 @@ abstract class FileLoader extends ArrayLoader
     /**
      * {@inheritdoc}
      */
-    public function load(mixed $resource, string $locale, string $domain = 'messages')
+    public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue
     {
         if (!stream_is_local($resource)) {
             throw new InvalidResourceException(sprintf('This is not a local file "%s".', $resource));
@@ -59,5 +60,5 @@ public function load(mixed $resource, string $locale, string $domain = 'messages
      *
      * @throws InvalidResourceException if stream content has an invalid format
      */
-    abstract protected function loadResource(string $resource);
+    abstract protected function loadResource(string $resource): array;
 }
diff --git a/src/Symfony/Component/Translation/Loader/IcuDatFileLoader.php b/src/Symfony/Component/Translation/Loader/IcuDatFileLoader.php
index e04d00b2d43db..c3ca5fd08b6f5 100644
--- a/src/Symfony/Component/Translation/Loader/IcuDatFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/IcuDatFileLoader.php
@@ -26,7 +26,7 @@ class IcuDatFileLoader extends IcuResFileLoader
     /**
      * {@inheritdoc}
      */
-    public function load(mixed $resource, string $locale, string $domain = 'messages')
+    public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue
     {
         if (!stream_is_local($resource.'.dat')) {
             throw new InvalidResourceException(sprintf('This is not a local file "%s".', $resource));
diff --git a/src/Symfony/Component/Translation/Loader/IcuResFileLoader.php b/src/Symfony/Component/Translation/Loader/IcuResFileLoader.php
index af2a270ec4f3f..392a098863e8d 100644
--- a/src/Symfony/Component/Translation/Loader/IcuResFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/IcuResFileLoader.php
@@ -26,7 +26,7 @@ class IcuResFileLoader implements LoaderInterface
     /**
      * {@inheritdoc}
      */
-    public function load(mixed $resource, string $locale, string $domain = 'messages')
+    public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue
     {
         if (!stream_is_local($resource)) {
             throw new InvalidResourceException(sprintf('This is not a local file "%s".', $resource));
@@ -75,7 +75,7 @@ public function load(mixed $resource, string $locale, string $domain = 'messages
      *
      * @return array the flattened ResourceBundle
      */
-    protected function flatten(\ResourceBundle $rb, array &$messages = [], string $path = null)
+    protected function flatten(\ResourceBundle $rb, array &$messages = [], string $path = null): array
     {
         foreach ($rb as $key => $value) {
             $nodePath = $path ? $path.'.'.$key : $key;
diff --git a/src/Symfony/Component/Translation/Loader/IniFileLoader.php b/src/Symfony/Component/Translation/Loader/IniFileLoader.php
index 7398f777814ab..04e294d119905 100644
--- a/src/Symfony/Component/Translation/Loader/IniFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/IniFileLoader.php
@@ -21,7 +21,7 @@ class IniFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    protected function loadResource(string $resource)
+    protected function loadResource(string $resource): array
     {
         return parse_ini_file($resource, true);
     }
diff --git a/src/Symfony/Component/Translation/Loader/JsonFileLoader.php b/src/Symfony/Component/Translation/Loader/JsonFileLoader.php
index 5aefba07229f6..67a8d58ede73f 100644
--- a/src/Symfony/Component/Translation/Loader/JsonFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/JsonFileLoader.php
@@ -23,7 +23,7 @@ class JsonFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    protected function loadResource(string $resource)
+    protected function loadResource(string $resource): array
     {
         $messages = [];
         if ($data = file_get_contents($resource)) {
diff --git a/src/Symfony/Component/Translation/Loader/LoaderInterface.php b/src/Symfony/Component/Translation/Loader/LoaderInterface.php
index 4970b2d2aa6eb..d92889a28dada 100644
--- a/src/Symfony/Component/Translation/Loader/LoaderInterface.php
+++ b/src/Symfony/Component/Translation/Loader/LoaderInterface.php
@@ -30,5 +30,5 @@ interface LoaderInterface
      * @throws NotFoundResourceException when the resource cannot be found
      * @throws InvalidResourceException  when the resource cannot be loaded
      */
-    public function load(mixed $resource, string $locale, string $domain = 'messages');
+    public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue;
 }
diff --git a/src/Symfony/Component/Translation/Loader/MoFileLoader.php b/src/Symfony/Component/Translation/Loader/MoFileLoader.php
index 0ff6549d5292b..9e03e374c82e1 100644
--- a/src/Symfony/Component/Translation/Loader/MoFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/MoFileLoader.php
@@ -41,7 +41,7 @@ class MoFileLoader extends FileLoader
      *
      * {@inheritdoc}
      */
-    protected function loadResource(string $resource)
+    protected function loadResource(string $resource): array
     {
         $stream = fopen($resource, 'r');
 
diff --git a/src/Symfony/Component/Translation/Loader/PhpFileLoader.php b/src/Symfony/Component/Translation/Loader/PhpFileLoader.php
index 85f10902b152d..e16ea0c1e0f8a 100644
--- a/src/Symfony/Component/Translation/Loader/PhpFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/PhpFileLoader.php
@@ -23,7 +23,7 @@ class PhpFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    protected function loadResource(string $resource)
+    protected function loadResource(string $resource): array
     {
         if ([] === self::$cache && \function_exists('opcache_invalidate') && filter_var(ini_get('opcache.enable'), \FILTER_VALIDATE_BOOLEAN) && (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true) || filter_var(ini_get('opcache.enable_cli'), \FILTER_VALIDATE_BOOLEAN))) {
             self::$cache = null;
diff --git a/src/Symfony/Component/Translation/Loader/PoFileLoader.php b/src/Symfony/Component/Translation/Loader/PoFileLoader.php
index ee143e20323cf..6df16148724b1 100644
--- a/src/Symfony/Component/Translation/Loader/PoFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/PoFileLoader.php
@@ -60,7 +60,7 @@ class PoFileLoader extends FileLoader
      *
      * {@inheritdoc}
      */
-    protected function loadResource(string $resource)
+    protected function loadResource(string $resource): array
     {
         $stream = fopen($resource, 'r');
 
diff --git a/src/Symfony/Component/Translation/Loader/QtFileLoader.php b/src/Symfony/Component/Translation/Loader/QtFileLoader.php
index 13ece0fca99ff..6d5582d662adc 100644
--- a/src/Symfony/Component/Translation/Loader/QtFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/QtFileLoader.php
@@ -28,7 +28,7 @@ class QtFileLoader implements LoaderInterface
     /**
      * {@inheritdoc}
      */
-    public function load(mixed $resource, string $locale, string $domain = 'messages')
+    public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue
     {
         if (!class_exists(XmlUtils::class)) {
             throw new RuntimeException('Loading translations from the QT format requires the Symfony Config component.');
diff --git a/src/Symfony/Component/Translation/Loader/XliffFileLoader.php b/src/Symfony/Component/Translation/Loader/XliffFileLoader.php
index d51c0ea17390a..85009b0db262c 100644
--- a/src/Symfony/Component/Translation/Loader/XliffFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/XliffFileLoader.php
@@ -31,7 +31,7 @@ class XliffFileLoader implements LoaderInterface
     /**
      * {@inheritdoc}
      */
-    public function load(mixed $resource, string $locale, string $domain = 'messages')
+    public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue
     {
         if (!class_exists(XmlUtils::class)) {
             throw new RuntimeException('Loading translations from the Xliff format requires the Symfony Config component.');
diff --git a/src/Symfony/Component/Translation/Loader/YamlFileLoader.php b/src/Symfony/Component/Translation/Loader/YamlFileLoader.php
index 8588e186ad1a8..5eccf99de0d8e 100644
--- a/src/Symfony/Component/Translation/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/YamlFileLoader.php
@@ -29,7 +29,7 @@ class YamlFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    protected function loadResource(string $resource)
+    protected function loadResource(string $resource): array
     {
         if (null === $this->yamlParser) {
             if (!class_exists(\Symfony\Component\Yaml\Parser::class)) {
diff --git a/src/Symfony/Component/Translation/LoggingTranslator.php b/src/Symfony/Component/Translation/LoggingTranslator.php
index 4b110865e9edf..8aa84ed9f4b22 100644
--- a/src/Symfony/Component/Translation/LoggingTranslator.php
+++ b/src/Symfony/Component/Translation/LoggingTranslator.php
@@ -77,7 +77,7 @@ public function getLocale(): string
     /**
      * {@inheritdoc}
      */
-    public function getCatalogue(string $locale = null)
+    public function getCatalogue(string $locale = null): MessageCatalogueInterface
     {
         return $this->translator->getCatalogue($locale);
     }
@@ -95,7 +95,7 @@ public function getCatalogues(): array
      *
      * @return array The fallback locales
      */
-    public function getFallbackLocales()
+    public function getFallbackLocales(): array
     {
         if ($this->translator instanceof Translator || method_exists($this->translator, 'getFallbackLocales')) {
             return $this->translator->getFallbackLocales();
diff --git a/src/Symfony/Component/Translation/MessageCatalogue.php b/src/Symfony/Component/Translation/MessageCatalogue.php
index 64ae2dd006bac..ed2de304e04d8 100644
--- a/src/Symfony/Component/Translation/MessageCatalogue.php
+++ b/src/Symfony/Component/Translation/MessageCatalogue.php
@@ -46,7 +46,7 @@ public function getLocale(): string
     /**
      * {@inheritdoc}
      */
-    public function getDomains()
+    public function getDomains(): array
     {
         $domains = [];
 
@@ -63,7 +63,7 @@ public function getDomains()
     /**
      * {@inheritdoc}
      */
-    public function all(string $domain = null)
+    public function all(string $domain = null): array
     {
         if (null !== $domain) {
             // skip messages merge if intl-icu requested explicitly
@@ -99,7 +99,7 @@ public function set(string $id, string $translation, string $domain = 'messages'
     /**
      * {@inheritdoc}
      */
-    public function has(string $id, string $domain = 'messages')
+    public function has(string $id, string $domain = 'messages'): bool
     {
         if (isset($this->messages[$domain][$id]) || isset($this->messages[$domain.self::INTL_DOMAIN_SUFFIX][$id])) {
             return true;
@@ -115,7 +115,7 @@ public function has(string $id, string $domain = 'messages')
     /**
      * {@inheritdoc}
      */
-    public function defines(string $id, string $domain = 'messages')
+    public function defines(string $id, string $domain = 'messages'): bool
     {
         return isset($this->messages[$domain][$id]) || isset($this->messages[$domain.self::INTL_DOMAIN_SUFFIX][$id]);
     }
@@ -123,7 +123,7 @@ public function defines(string $id, string $domain = 'messages')
     /**
      * {@inheritdoc}
      */
-    public function get(string $id, string $domain = 'messages')
+    public function get(string $id, string $domain = 'messages'): string
     {
         if (isset($this->messages[$domain.self::INTL_DOMAIN_SUFFIX][$id])) {
             return $this->messages[$domain.self::INTL_DOMAIN_SUFFIX][$id];
@@ -233,7 +233,7 @@ public function addFallbackCatalogue(MessageCatalogueInterface $catalogue)
     /**
      * {@inheritdoc}
      */
-    public function getFallbackCatalogue()
+    public function getFallbackCatalogue(): ?MessageCatalogueInterface
     {
         return $this->fallbackCatalogue;
     }
@@ -241,7 +241,7 @@ public function getFallbackCatalogue()
     /**
      * {@inheritdoc}
      */
-    public function getResources()
+    public function getResources(): array
     {
         return array_values($this->resources);
     }
@@ -257,7 +257,7 @@ public function addResource(ResourceInterface $resource)
     /**
      * {@inheritdoc}
      */
-    public function getMetadata(string $key = '', string $domain = 'messages')
+    public function getMetadata(string $key = '', string $domain = 'messages'): mixed
     {
         if ('' == $domain) {
             return $this->metadata;
diff --git a/src/Symfony/Component/Translation/MessageCatalogueInterface.php b/src/Symfony/Component/Translation/MessageCatalogueInterface.php
index 51e6dc8510270..792444c71fecd 100644
--- a/src/Symfony/Component/Translation/MessageCatalogueInterface.php
+++ b/src/Symfony/Component/Translation/MessageCatalogueInterface.php
@@ -27,14 +27,14 @@ interface MessageCatalogueInterface
      *
      * @return string The locale
      */
-    public function getLocale();
+    public function getLocale(): string;
 
     /**
      * Gets the domains.
      *
      * @return array An array of domains
      */
-    public function getDomains();
+    public function getDomains(): array;
 
     /**
      * Gets the messages within a given domain.
@@ -45,7 +45,7 @@ public function getDomains();
      *
      * @return array An array of messages
      */
-    public function all(string $domain = null);
+    public function all(string $domain = null): array;
 
     /**
      * Sets a message translation.
@@ -64,7 +64,7 @@ public function set(string $id, string $translation, string $domain = 'messages'
      *
      * @return bool true if the message has a translation, false otherwise
      */
-    public function has(string $id, string $domain = 'messages');
+    public function has(string $id, string $domain = 'messages'): bool;
 
     /**
      * Checks if a message has a translation (it does not take into account the fallback mechanism).
@@ -74,7 +74,7 @@ public function has(string $id, string $domain = 'messages');
      *
      * @return bool true if the message has a translation, false otherwise
      */
-    public function defines(string $id, string $domain = 'messages');
+    public function defines(string $id, string $domain = 'messages'): bool;
 
     /**
      * Gets a message translation.
@@ -84,7 +84,7 @@ public function defines(string $id, string $domain = 'messages');
      *
      * @return string The message translation
      */
-    public function get(string $id, string $domain = 'messages');
+    public function get(string $id, string $domain = 'messages'): string;
 
     /**
      * Sets translations for a given domain.
@@ -119,17 +119,15 @@ public function addFallbackCatalogue(self $catalogue);
 
     /**
      * Gets the fallback catalogue.
-     *
-     * @return self|null
      */
-    public function getFallbackCatalogue();
+    public function getFallbackCatalogue(): ?self;
 
     /**
      * Returns an array of resources loaded to build this collection.
      *
      * @return ResourceInterface[] An array of resources
      */
-    public function getResources();
+    public function getResources(): array;
 
     /**
      * Adds a resource for this collection.
diff --git a/src/Symfony/Component/Translation/MetadataAwareInterface.php b/src/Symfony/Component/Translation/MetadataAwareInterface.php
index 240076971873d..2eaaceb36eb42 100644
--- a/src/Symfony/Component/Translation/MetadataAwareInterface.php
+++ b/src/Symfony/Component/Translation/MetadataAwareInterface.php
@@ -27,7 +27,7 @@ interface MetadataAwareInterface
      *
      * @return mixed The value that was set or an array with the domains/keys or null
      */
-    public function getMetadata(string $key = '', string $domain = 'messages');
+    public function getMetadata(string $key = '', string $domain = 'messages'): mixed;
 
     /**
      * Adds metadata to a message domain.
diff --git a/src/Symfony/Component/Translation/Translator.php b/src/Symfony/Component/Translation/Translator.php
index 8e013ef972e3c..566f3ef542a02 100644
--- a/src/Symfony/Component/Translation/Translator.php
+++ b/src/Symfony/Component/Translation/Translator.php
@@ -227,7 +227,7 @@ public function trans(?string $id, array $parameters = [], string $domain = null
     /**
      * {@inheritdoc}
      */
-    public function getCatalogue(string $locale = null)
+    public function getCatalogue(string $locale = null): MessageCatalogueInterface
     {
         if (!$locale) {
             $locale = $this->getLocale();
@@ -255,7 +255,7 @@ public function getCatalogues(): array
      *
      * @return array LoaderInterface[]
      */
-    protected function getLoaders()
+    protected function getLoaders(): array
     {
         return $this->loaders;
     }
diff --git a/src/Symfony/Component/Translation/TranslatorBagInterface.php b/src/Symfony/Component/Translation/TranslatorBagInterface.php
index 4228977352f29..a818e7ff73de8 100644
--- a/src/Symfony/Component/Translation/TranslatorBagInterface.php
+++ b/src/Symfony/Component/Translation/TranslatorBagInterface.php
@@ -31,5 +31,5 @@ interface TranslatorBagInterface
      *
      * @throws InvalidArgumentException If the locale contains invalid characters
      */
-    public function getCatalogue(string $locale = null);
+    public function getCatalogue(string $locale = null): MessageCatalogueInterface;
 }
diff --git a/src/Symfony/Component/Translation/Util/ArrayConverter.php b/src/Symfony/Component/Translation/Util/ArrayConverter.php
index acfbfc363e8b7..639947bbf28c0 100644
--- a/src/Symfony/Component/Translation/Util/ArrayConverter.php
+++ b/src/Symfony/Component/Translation/Util/ArrayConverter.php
@@ -33,7 +33,7 @@ class ArrayConverter
      *
      * @return array Tree-like messages array
      */
-    public static function expandToTree(array $messages)
+    public static function expandToTree(array $messages): array
     {
         $tree = [];
 
diff --git a/src/Symfony/Component/Translation/Writer/TranslationWriter.php b/src/Symfony/Component/Translation/Writer/TranslationWriter.php
index 0a349b824689f..41397cc05badb 100644
--- a/src/Symfony/Component/Translation/Writer/TranslationWriter.php
+++ b/src/Symfony/Component/Translation/Writer/TranslationWriter.php
@@ -38,7 +38,7 @@ public function addDumper(string $format, DumperInterface $dumper)
      *
      * @return array
      */
-    public function getFormats()
+    public function getFormats(): array
     {
         return array_keys($this->dumpers);
     }