minor #32229 [Serializer] [5.0] Add type-hints to serializer interface (Simperfit)

This PR was merged into the 5.0-dev branch.

Discussion
----------

[Serializer] [5.0] Add type-hints to serializer interface

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | #32179   <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | none <!-- required for new features -->

<!--
Replace this notice by a short README for your feature/bugfix. This will help people
understand your PR and can be used as a start for the documentation.

Additionally (see https://symfony.com/roadmap):
 - Bug fixes must be submitted against the lowest maintained branch where they apply
   (lowest branches are regularly merged to upper ones so they get the fixes too).
 - Features and deprecations must be submitted against branch 4.4.
 - Legacy code removals go to the master branch.
-->

This PR adds type-hints to the serializer component ;).

Commits
-------

68b588cf45 [Serializer] [5.0] Add type-hints to serializer interface

src/Symfony/Component/Serializer/Encoder/ChainDecoder.php

@@ -35,7 +35,7 @@ class ChainDecoder implements ContextAwareDecoderInterface
     /**
      * {@inheritdoc}
      */
-    final public function decode($data, $format, array $context = [])
+    final public function decode(string $data, string $format, array $context = [])
     {
         return $this->getDecoder($format, $context)->decode($data, $format, $context);
     }
@@ -43,7 +43,7 @@ class ChainDecoder implements ContextAwareDecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function supportsDecoding($format, array $context = []): bool
+    public function supportsDecoding(string $format, array $context = []): bool
     {
         try {
             $this->getDecoder($format, $context);

src/Symfony/Component/Serializer/Encoder/ChainEncoder.php

@@ -35,7 +35,7 @@ class ChainEncoder implements ContextAwareEncoderInterface
     /**
      * {@inheritdoc}
      */
-    final public function encode($data, $format, array $context = [])
+    final public function encode($data, string $format, array $context = [])
     {
         return $this->getEncoder($format, $context)->encode($data, $format, $context);
     }
@@ -43,7 +43,7 @@ class ChainEncoder implements ContextAwareEncoderInterface
     /**
      * {@inheritdoc}
      */
-    public function supportsEncoding($format, array $context = []): bool
+    public function supportsEncoding(string $format, array $context = []): bool
     {
         try {
             $this->getEncoder($format, $context);
@@ -56,11 +56,8 @@ class ChainEncoder implements ContextAwareEncoderInterface
 
     /**
      * Checks whether the normalization is needed for the given format.
-     *
-     * @param string $format
-     * @param array  $context
      */
-    public function needsNormalization($format, array $context = []): bool
+    public function needsNormalization(string $format, array $context = []): bool
     {
         $encoder = $this->getEncoder($format, $context);
 

src/Symfony/Component/Serializer/Encoder/ContextAwareDecoderInterface.php

@@ -23,5 +23,5 @@ interface ContextAwareDecoderInterface extends DecoderInterface
      *
      * @param array $context options that decoders have access to
      */
-    public function supportsDecoding($format, array $context = []);
+    public function supportsDecoding(string $format, array $context = []);
 }

src/Symfony/Component/Serializer/Encoder/ContextAwareEncoderInterface.php

@@ -23,5 +23,5 @@ interface ContextAwareEncoderInterface extends EncoderInterface
      *
      * @param array $context options that encoders have access to
      */
-    public function supportsEncoding($format, array $context = []);
+    public function supportsEncoding(string $format, array $context = []);
 }

src/Symfony/Component/Serializer/Encoder/CsvEncoder.php

@@ -51,7 +51,7 @@ class CsvEncoder implements EncoderInterface, DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function encode($data, $format, array $context = [])
+    public function encode($data, string $format, array $context = [])
     {
         $handle = fopen('php://temp,', 'w+');
 
@@ -110,7 +110,7 @@ class CsvEncoder implements EncoderInterface, DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function decode($data, $format, array $context = [])
+    public function decode(string $data, string $format, array $context = [])
     {
         $handle = fopen('php://temp', 'r+');
         fwrite($handle, $data);

src/Symfony/Component/Serializer/Encoder/DecoderInterface.php

@@ -36,7 +36,7 @@ interface DecoderInterface
      *
      * @throws UnexpectedValueException
      */
-    public function decode($data, $format, array $context = []);
+    public function decode(string $data, string $format, array $context = []);
 
     /**
      * Checks whether the deserializer can decode from given format.
@@ -45,5 +45,5 @@ interface DecoderInterface
      *
      * @return bool
      */
-    public function supportsDecoding($format);
+    public function supportsDecoding(string $format);
 }

src/Symfony/Component/Serializer/Encoder/EncoderInterface.php

@@ -31,7 +31,7 @@ interface EncoderInterface
      *
      * @throws UnexpectedValueException
      */
-    public function encode($data, $format, array $context = []);
+    public function encode($data, string $format, array $context = []);
 
     /**
      * Checks whether the serializer can encode to given format.
@@ -40,5 +40,5 @@ interface EncoderInterface
      *
      * @return bool
      */
-    public function supportsEncoding($format);
+    public function supportsEncoding(string $format);
 }

src/Symfony/Component/Serializer/Encoder/JsonDecode.php

@@ -72,7 +72,7 @@ class JsonDecode implements DecoderInterface
      *
      * @see http://php.net/json_decode json_decode
      */
-    public function decode($data, $format, array $context = [])
+    public function decode(string $data, string $format, array $context = [])
     {
         $associative = $context[self::ASSOCIATIVE] ?? $this->defaultContext[self::ASSOCIATIVE];
         $recursionDepth = $context[self::RECURSION_DEPTH] ?? $this->defaultContext[self::RECURSION_DEPTH];
@@ -98,7 +98,7 @@ class JsonDecode implements DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function supportsDecoding($format)
+    public function supportsDecoding(string $format)
     {
         return JsonEncoder::FORMAT === $format;
     }

src/Symfony/Component/Serializer/Encoder/JsonEncode.php

@@ -36,7 +36,7 @@ class JsonEncode implements EncoderInterface
      *
      * {@inheritdoc}
      */
-    public function encode($data, $format, array $context = [])
+    public function encode($data, string $format, array $context = [])
     {
         $options = $context[self::OPTIONS] ?? $this->defaultContext[self::OPTIONS];
 
@@ -60,7 +60,7 @@ class JsonEncode implements EncoderInterface
     /**
      * {@inheritdoc}
      */
-    public function supportsEncoding($format)
+    public function supportsEncoding(string $format)
     {
         return JsonEncoder::FORMAT === $format;
     }

src/Symfony/Component/Serializer/Encoder/JsonEncoder.php

@@ -32,7 +32,7 @@ class JsonEncoder implements EncoderInterface, DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function encode($data, $format, array $context = [])
+    public function encode($data, string $format, array $context = [])
     {
         return $this->encodingImpl->encode($data, self::FORMAT, $context);
     }
@@ -40,7 +40,7 @@ class JsonEncoder implements EncoderInterface, DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function decode($data, $format, array $context = [])
+    public function decode(string $data, string $format, array $context = [])
     {
         return $this->decodingImpl->decode($data, self::FORMAT, $context);
     }
@@ -48,7 +48,7 @@ class JsonEncoder implements EncoderInterface, DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function supportsEncoding($format)
+    public function supportsEncoding(string $format)
     {
         return self::FORMAT === $format;
     }
@@ -56,7 +56,7 @@ class JsonEncoder implements EncoderInterface, DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function supportsDecoding($format)
+    public function supportsDecoding(string $format)
     {
         return self::FORMAT === $format;
     }

src/Symfony/Component/Serializer/Encoder/XmlEncoder.php

@@ -79,7 +79,7 @@ class XmlEncoder implements EncoderInterface, DecoderInterface, NormalizationAwa
     /**
      * {@inheritdoc}
      */
-    public function encode($data, $format, array $context = [])
+    public function encode($data, string $format, array $context = [])
     {
         $encoderIgnoredNodeTypes = $context[self::ENCODER_IGNORED_NODE_TYPES] ?? $this->defaultContext[self::ENCODER_IGNORED_NODE_TYPES];
         $ignorePiNode = \in_array(XML_PI_NODE, $encoderIgnoredNodeTypes, true);
@@ -107,7 +107,7 @@ class XmlEncoder implements EncoderInterface, DecoderInterface, NormalizationAwa
     /**
      * {@inheritdoc}
      */
-    public function decode($data, $format, array $context = [])
+    public function decode(string $data, string $format, array $context = [])
     {
         if ('' === trim($data)) {
             throw new NotEncodableValueException('Invalid XML data, it can not be empty.');
@@ -176,7 +176,7 @@ class XmlEncoder implements EncoderInterface, DecoderInterface, NormalizationAwa
     /**
      * {@inheritdoc}
      */
-    public function supportsEncoding($format)
+    public function supportsEncoding(string $format)
     {
         return self::FORMAT === $format;
     }
@@ -184,7 +184,7 @@ class XmlEncoder implements EncoderInterface, DecoderInterface, NormalizationAwa
     /**
      * {@inheritdoc}
      */
-    public function supportsDecoding($format)
+    public function supportsDecoding(string $format)
     {
         return self::FORMAT === $format;
     }

src/Symfony/Component/Serializer/Encoder/YamlEncoder.php

@@ -43,7 +43,7 @@ class YamlEncoder implements EncoderInterface, DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function encode($data, $format, array $context = [])
+    public function encode($data, string $format, array $context = [])
     {
         $context = array_merge($this->defaultContext, $context);
 
@@ -53,7 +53,7 @@ class YamlEncoder implements EncoderInterface, DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function supportsEncoding($format)
+    public function supportsEncoding(string $format)
     {
         return self::FORMAT === $format || self::ALTERNATIVE_FORMAT === $format;
     }
@@ -61,7 +61,7 @@ class YamlEncoder implements EncoderInterface, DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function decode($data, $format, array $context = [])
+    public function decode(string $data, string $format, array $context = [])
     {
         $context = array_merge($this->defaultContext, $context);
 
@@ -71,7 +71,7 @@ class YamlEncoder implements EncoderInterface, DecoderInterface
     /**
      * {@inheritdoc}
      */
-    public function supportsDecoding($format)
+    public function supportsDecoding(string $format)
     {
         return self::FORMAT === $format || self::ALTERNATIVE_FORMAT === $format;
     }

src/Symfony/Component/Serializer/Mapping/AttributeMetadataInterface.php

@@ -34,7 +34,7 @@ interface AttributeMetadataInterface
      *
      * @param string $group
      */
-    public function addGroup($group);
+    public function addGroup(string $group);
 
     /**
      * Gets groups of this attribute.
@@ -48,7 +48,7 @@ interface AttributeMetadataInterface
      *
      * @param int|null $maxDepth
      */
-    public function setMaxDepth($maxDepth);
+    public function setMaxDepth(?int $maxDepth);
 
     /**
      * Gets the serialization max depth for this attribute.

src/Symfony/Component/Serializer/NameConverter/CamelCaseToSnakeCaseNameConverter.php

@@ -34,7 +34,7 @@ class CamelCaseToSnakeCaseNameConverter implements NameConverterInterface
     /**
      * {@inheritdoc}
      */
-    public function normalize($propertyName)
+    public function normalize(string $propertyName)
     {
         if (null === $this->attributes || \in_array($propertyName, $this->attributes)) {
             return strtolower(preg_replace('/[A-Z]/', '_\\0', lcfirst($propertyName)));
@@ -46,7 +46,7 @@ class CamelCaseToSnakeCaseNameConverter implements NameConverterInterface
     /**
      * {@inheritdoc}
      */
-    public function denormalize($propertyName)
+    public function denormalize(string $propertyName)
     {
         $camelCasedName = preg_replace_callback('/(^|_|\.)+(.)/', function ($match) {
             return ('.' === $match[1] ? '_' : '').strtoupper($match[2]);

src/Symfony/Component/Serializer/NameConverter/NameConverterInterface.php

@@ -25,7 +25,7 @@ interface NameConverterInterface
      *
      * @return string
      */
-    public function normalize($propertyName);
+    public function normalize(string $propertyName);
 
     /**
      * Converts a property name to its denormalized value.
@@ -34,5 +34,5 @@ interface NameConverterInterface
      *
      * @return string
      */
-    public function denormalize($propertyName);
+    public function denormalize(string $propertyName);
 }

src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php

@@ -121,7 +121,7 @@ abstract class AbstractObjectNormalizer extends AbstractNormalizer
     /**
      * {@inheritdoc}
      */
-    public function supportsNormalization($data, $format = null)
+    public function supportsNormalization($data, string $format = null)
     {
         return \is_object($data) && !$data instanceof \Traversable;
     }
@@ -129,7 +129,7 @@ abstract class AbstractObjectNormalizer extends AbstractNormalizer
     /**
      * {@inheritdoc}
      */
-    public function normalize($object, $format = null, array $context = [])
+    public function normalize($object, string $format = null, array $context = [])
     {
         if (!isset($context['cache_key'])) {
             $context['cache_key'] = $this->getCacheKey($format, $context);
@@ -233,7 +233,7 @@ abstract class AbstractObjectNormalizer extends AbstractNormalizer
      *
      * @return string[]
      */
-    protected function getAttributes($object, $format = null, array $context)
+    protected function getAttributes($object, string $format = null, array $context)
     {
         $class = $this->objectClassResolver ? ($this->objectClassResolver)($object) : \get_class($object);
         $key = $class.'-'.$context['cache_key'];
@@ -274,7 +274,7 @@ abstract class AbstractObjectNormalizer extends AbstractNormalizer
      *
      * @return string[]
      */
-    abstract protected function extractAttributes($object, $format = null, array $context = []);
+    abstract protected function extractAttributes($object, string $format = null, array $context = []);
 
     /**
      * Gets the attribute value.
@@ -286,12 +286,12 @@ abstract class AbstractObjectNormalizer extends AbstractNormalizer
      *
      * @return mixed
      */
-    abstract protected function getAttributeValue($object, $attribute, $format = null, array $context = []);
+    abstract protected function getAttributeValue($object, string $attribute, string $format = null, array $context = []);
 
     /**
      * {@inheritdoc}
      */
-    public function supportsDenormalization($data, $type, $format = null)
+    public function supportsDenormalization($data, $type, string $format = null)
     {
         return class_exists($type) || (interface_exists($type, false) && $this->classDiscriminatorResolver && null !== $this->classDiscriminatorResolver->getMappingForClass($type));
     }
@@ -299,7 +299,7 @@ abstract class AbstractObjectNormalizer extends AbstractNormalizer
     /**
      * {@inheritdoc}
      */
-    public function denormalize($data, $class, $format = null, array $context = [])
+    public function denormalize($data, $class, string $format = null, array $context = [])
     {
         if (!isset($context['cache_key'])) {
             $context['cache_key'] = $this->getCacheKey($format, $context);

src/Symfony/Component/Serializer/Normalizer/ContextAwareDenormalizerInterface.php

@@ -23,5 +23,5 @@ interface ContextAwareDenormalizerInterface extends DenormalizerInterface
      *
      * @param array $context options that denormalizers have access to
      */
-    public function supportsDenormalization($data, $type, $format = null, array $context = []);
+    public function supportsDenormalization($data, string $type, string $format = null, array $context = []);
 }

src/Symfony/Component/Serializer/Normalizer/ContextAwareNormalizerInterface.php

@@ -23,5 +23,5 @@ interface ContextAwareNormalizerInterface extends NormalizerInterface
      *
      * @param array $context options that normalizers have access to
      */
-    public function supportsNormalization($data, $format = null, array $context = []);
+    public function supportsNormalization($data, string $format = null, array $context = []);
 }

src/Symfony/Component/Serializer/Normalizer/CustomNormalizer.php

@@ -25,7 +25,7 @@ class CustomNormalizer implements NormalizerInterface, DenormalizerInterface, Se
     /**
      * {@inheritdoc}
      */
-    public function normalize($object, $format = null, array $context = [])
+    public function normalize($object, string $format = null, array $context = [])
     {
         return $object->normalize($this->serializer, $format, $context);
     }
@@ -33,7 +33,7 @@ class CustomNormalizer implements NormalizerInterface, DenormalizerInterface, Se
     /**
      * {@inheritdoc}
      */
-    public function denormalize($data, $class, $format = null, array $context = [])
+    public function denormalize($data, $class, string $format = null, array $context = [])
     {
         $object = $this->extractObjectToPopulate($class, $context) ?: new $class();
         $object->denormalize($this->serializer, $data, $format, $context);
@@ -49,7 +49,7 @@ class CustomNormalizer implements NormalizerInterface, DenormalizerInterface, Se
      *
      * @return bool
      */
-    public function supportsNormalization($data, $format = null)
+    public function supportsNormalization($data, string $format = null)
     {
         return $data instanceof NormalizableInterface;
     }
@@ -63,7 +63,7 @@ class CustomNormalizer implements NormalizerInterface, DenormalizerInterface, Se
      *
      * @return bool
      */
-    public function supportsDenormalization($data, $type, $format = null)
+    public function supportsDenormalization($data, $type, string $format = null)
     {
         return is_subclass_of($type, DenormalizableInterface::class);
     }

src/Symfony/Component/Serializer/Normalizer/DataUriNormalizer.php

@@ -48,7 +48,7 @@ class DataUriNormalizer implements NormalizerInterface, DenormalizerInterface, C
     /**
      * {@inheritdoc}
      */
-    public function normalize($object, $format = null, array $context = [])
+    public function normalize($object, string $format = null, array $context = [])
     {
         if (!$object instanceof \SplFileInfo) {
             throw new InvalidArgumentException('The object must be an instance of "\SplFileInfo".');
@@ -74,7 +74,7 @@ class DataUriNormalizer implements NormalizerInterface, DenormalizerInterface, C
     /**
      * {@inheritdoc}
      */
-    public function supportsNormalization($data, $format = null)
+    public function supportsNormalization($data, string $format = null)
     {
         return $data instanceof \SplFileInfo;
     }
@@ -89,7 +89,7 @@ class DataUriNormalizer implements NormalizerInterface, DenormalizerInterface, C
      * @throws InvalidArgumentException
      * @throws NotNormalizableValueException
      */
-    public function denormalize($data, $class, $format = null, array $context = [])
+    public function denormalize($data, $class, string $format = null, array $context = [])
     {
         if (!preg_match('/^data:([a-z0-9][a-z0-9\!\#\$\&\-\^\_\+\.]{0,126}\/[a-z0-9][a-z0-9\!\#\$\&\-\^\_\+\.]{0,126}(;[a-z0-9\-]+\=[a-z0-9\-]+)?)?(;base64)?,[a-z0-9\!\$\&\\\'\,\(\)\*\+\,\;\=\-\.\_\~\:\@\/\?\%\s]*\s*$/i', $data)) {
             throw new NotNormalizableValueException('The provided "data:" URI is not valid.');
@@ -118,7 +118,7 @@ class DataUriNormalizer implements NormalizerInterface, DenormalizerInterface, C
     /**
      * {@inheritdoc}
      */
-    public function supportsDenormalization($data, $type, $format = null)
+    public function supportsDenormalization($data, $type, string $format = null)
     {
         return isset(self::$supportedTypes[$type]);
     }

src/Symfony/Component/Serializer/Normalizer/DateIntervalNormalizer.php

@@ -38,7 +38,7 @@ class DateIntervalNormalizer implements NormalizerInterface, DenormalizerInterfa
      *
      * @throws InvalidArgumentException
      */
-    public function normalize($object, $format = null, array $context = [])
+    public function normalize($object, string $format = null, array $context = [])
     {
         if (!$object instanceof \DateInterval) {
             throw new InvalidArgumentException('The object must be an instance of "\DateInterval".');
@@ -50,7 +50,7 @@ class DateIntervalNormalizer implements NormalizerInterface, DenormalizerInterfa
     /**
      * {@inheritdoc}
      */
-    public function supportsNormalization($data, $format = null)
+    public function supportsNormalization($data, string $format = null)
     {
         return $data instanceof \DateInterval;
     }
@@ -69,7 +69,7 @@ class DateIntervalNormalizer implements NormalizerInterface, DenormalizerInterfa
      * @throws InvalidArgumentException
      * @throws UnexpectedValueException
      */
-    public function denormalize($data, $class, $format = null, array $context = [])
+    public function denormalize($data, $class, string $format = null, array $context = [])
     {
         if (!\is_string($data)) {
             throw new InvalidArgumentException(sprintf('Data expected to be a string, %s given.', \gettype($data)));
@@ -96,7 +96,7 @@ class DateIntervalNormalizer implements NormalizerInterface, DenormalizerInterfa
     /**
      * {@inheritdoc}
      */
-    public function supportsDenormalization($data, $type, $format = null)
+    public function supportsDenormalization($data, $type, string $format = null)
     {
         return \DateInterval::class === $type;
     }

src/Symfony/Component/Serializer/Normalizer/DateTimeNormalizer.php

@@ -46,7 +46,7 @@ class DateTimeNormalizer implements NormalizerInterface, DenormalizerInterface,
      *
      * @throws InvalidArgumentException
      */
-    public function normalize($object, $format = null, array $context = [])
+    public function normalize($object, string $format = null, array $context = [])
     {
         if (!$object instanceof \DateTimeInterface) {
             throw new InvalidArgumentException('The object must implement the "\DateTimeInterface".');
@@ -66,7 +66,7 @@ class DateTimeNormalizer implements NormalizerInterface, DenormalizerInterface,
     /**
      * {@inheritdoc}
      */
-    public function supportsNormalization($data, $format = null)
+    public function supportsNormalization($data, string $format = null)
     {
         return $data instanceof \DateTimeInterface;
     }
@@ -76,7 +76,7 @@ class DateTimeNormalizer implements NormalizerInterface, DenormalizerInterface,
      *
      * @throws NotNormalizableValueException
      */
-    public function denormalize($data, $class, $format = null, array $context = [])
+    public function denormalize($data, $class, string $format = null, array $context = [])
     {
         $dateTimeFormat = $context[self::FORMAT_KEY] ?? null;
         $timezone = $this->getTimezone($context);
@@ -113,7 +113,7 @@ class DateTimeNormalizer implements NormalizerInterface, DenormalizerInterface,
     /**
      * {@inheritdoc}
      */
-    public function supportsDenormalization($data, $type, $format = null)
+    public function supportsDenormalization($data, $type, string $format = null)
     {
         return isset(self::$supportedTypes[$type]);
     }

src/Symfony/Component/Serializer/Normalizer/DateTimeZoneNormalizer.php

@@ -26,7 +26,7 @@ class DateTimeZoneNormalizer implements NormalizerInterface, DenormalizerInterfa
      *
      * @throws InvalidArgumentException
      */
-    public function normalize($object, $format = null, array $context = [])
+    public function normalize($object, string $format = null, array $context = [])
     {
         if (!$object instanceof \DateTimeZone) {
             throw new InvalidArgumentException('The object must be an instance of "\DateTimeZone".');
@@ -38,7 +38,7 @@ class DateTimeZoneNormalizer implements NormalizerInterface, DenormalizerInterfa
     /**
      * {@inheritdoc}
      */
-    public function supportsNormalization($data, $format = null)
+    public function supportsNormalization($data, string $format = null)
     {
         return $data instanceof \DateTimeZone;
     }
@@ -48,7 +48,7 @@ class DateTimeZoneNormalizer implements NormalizerInterface, DenormalizerInterfa
      *
      * @throws NotNormalizableValueException
      */
-    public function denormalize($data, $class, $format = null, array $context = [])
+    public function denormalize($data, $class, string $format = null, array $context = [])
     {
         if ('' === $data || null === $data) {
             throw new NotNormalizableValueException('The data is either an empty string or null, you should pass a string that can be parsed as a DateTimeZone.');
@@ -64,7 +64,7 @@ class DateTimeZoneNormalizer implements NormalizerInterface, DenormalizerInterfa
     /**
      * {@inheritdoc}
      */
-    public function supportsDenormalization($data, $type, $format = null)
+    public function supportsDenormalization($data, $type, string $format = null)
     {
         return \DateTimeZone::class === $type;
     }

src/Symfony/Component/Serializer/Normalizer/DenormalizerInterface.php

@@ -44,7 +44,7 @@ interface DenormalizerInterface
      * @throws RuntimeException         Occurs if the class cannot be instantiated
      * @throws ExceptionInterface       Occurs for all the other cases of errors
      */
-    public function denormalize($data, $class, $format = null, array $context = []);
+    public function denormalize($data, string $class, string $format = null, array $context = []);
 
     /**
      * Checks whether the given class is supported for denormalization by this normalizer.
@@ -55,5 +55,5 @@ interface DenormalizerInterface
      *
      * @return bool
      */
-    public function supportsDenormalization($data, $type, $format = null);
+    public function supportsDenormalization($data, string $type, string $format = null);
 }

src/Symfony/Component/Serializer/Normalizer/GetSetMethodNormalizer.php

@@ -39,7 +39,7 @@ class GetSetMethodNormalizer extends AbstractObjectNormalizer
     /**
      * {@inheritdoc}
      */
-    public function supportsNormalization($data, $format = null)
+    public function supportsNormalization($data, string $format = null)
     {
         return parent::supportsNormalization($data, $format) && $this->supports(\get_class($data));
     }
@@ -47,7 +47,7 @@ class GetSetMethodNormalizer extends AbstractObjectNormalizer
     /**
      * {@inheritdoc}
      */
-    public function supportsDenormalization($data, $type, $format = null)
+    public function supportsDenormalization($data, $type, string $format = null)
     {
         return parent::supportsDenormalization($data, $type, $format) && $this->supports($type);
     }

src/Symfony/Component/Serializer/Normalizer/JsonSerializableNormalizer.php

@@ -24,7 +24,7 @@ class JsonSerializableNormalizer extends AbstractNormalizer
     /**
      * {@inheritdoc}
      */
-    public function normalize($object, $format = null, array $context = [])
+    public function normalize($object, string $format = null, array $context = [])
     {
         if ($this->isCircularReference($object, $context)) {
             return $this->handleCircularReference($object);
@@ -44,7 +44,7 @@ class JsonSerializableNormalizer extends AbstractNormalizer
     /**
      * {@inheritdoc}
      */
-    public function supportsNormalization($data, $format = null)
+    public function supportsNormalization($data, string $format = null)
     {
         return $data instanceof \JsonSerializable;
     }
@@ -52,7 +52,7 @@ class JsonSerializableNormalizer extends AbstractNormalizer
     /**
      * {@inheritdoc}
      */
-    public function supportsDenormalization($data, $type, $format = null)
+    public function supportsDenormalization($data, $type, string $format = null)
     {
         return false;
     }
@@ -60,7 +60,7 @@ class JsonSerializableNormalizer extends AbstractNormalizer
     /**
      * {@inheritdoc}
      */
-    public function denormalize($data, $class, $format = null, array $context = [])
+    public function denormalize($data, $class, string $format = null, array $context = [])
     {
         throw new LogicException(sprintf('Cannot denormalize with "%s".', \JsonSerializable::class));
     }

src/Symfony/Component/Serializer/Normalizer/NormalizableInterface.php

@@ -35,5 +35,5 @@ interface NormalizableInterface
      *
      * @return array|string|int|float|bool
      */
-    public function normalize(NormalizerInterface $normalizer, $format = null, array $context = []);
+    public function normalize(NormalizerInterface $normalizer, string $format = null, array $context = []);
 }

src/Symfony/Component/Serializer/Normalizer/NormalizerInterface.php

@@ -38,7 +38,7 @@ interface NormalizerInterface
      * @throws LogicException             Occurs when the normalizer is not called in an expected context
      * @throws ExceptionInterface         Occurs for all the other cases of errors
      */
-    public function normalize($object, $format = null, array $context = []);
+    public function normalize($object, string $format = null, array $context = []);
 
     /**
      * Checks whether the given class is supported for normalization by this normalizer.
@@ -48,5 +48,5 @@ interface NormalizerInterface
      *
      * @return bool
      */
-    public function supportsNormalization($data, $format = null);
+    public function supportsNormalization($data, string $format = null);
 }

src/Symfony/Component/Serializer/Normalizer/ObjectNormalizer.php

@@ -60,7 +60,7 @@ class ObjectNormalizer extends AbstractObjectNormalizer
     /**
      * {@inheritdoc}
      */
-    protected function extractAttributes($object, $format = null, array $context = [])
+    protected function extractAttributes($object, string $format = null, array $context = [])
     {
         // If not using groups, detect manually
         $attributes = [];
@@ -118,7 +118,7 @@ class ObjectNormalizer extends AbstractObjectNormalizer
     /**
      * {@inheritdoc}
      */
-    protected function getAttributeValue($object, $attribute, $format = null, array $context = [])
+    protected function getAttributeValue($object, $attribute, string $format = null, array $context = [])
     {
         $cacheKey = \get_class($object);
         if (!\array_key_exists($cacheKey, $this->discriminatorCache)) {

src/Symfony/Component/Serializer/Normalizer/PropertyNormalizer.php

@@ -33,7 +33,7 @@ class PropertyNormalizer extends AbstractObjectNormalizer
     /**
      * {@inheritdoc}
      */
-    public function supportsNormalization($data, $format = null)
+    public function supportsNormalization($data, string $format = null)
     {
         return parent::supportsNormalization($data, $format) && $this->supports(\get_class($data));
     }
@@ -41,7 +41,7 @@ class PropertyNormalizer extends AbstractObjectNormalizer
     /**
      * {@inheritdoc}
      */
-    public function supportsDenormalization($data, $type, $format = null)
+    public function supportsDenormalization($data, $type, string $format = null)
     {
         return parent::supportsDenormalization($data, $type, $format) && $this->supports($type);
     }
@@ -97,7 +97,7 @@ class PropertyNormalizer extends AbstractObjectNormalizer
     /**
      * {@inheritdoc}
      */
-    protected function extractAttributes($object, $format = null, array $context = [])
+    protected function extractAttributes($object, string $format = null, array $context = [])
     {
         $reflectionObject = new \ReflectionObject($object);
         $attributes = [];
@@ -118,7 +118,7 @@ class PropertyNormalizer extends AbstractObjectNormalizer
     /**
      * {@inheritdoc}
      */
-    protected function getAttributeValue($object, $attribute, $format = null, array $context = [])
+    protected function getAttributeValue($object, $attribute, string $format = null, array $context = [])
     {
         try {
             $reflectionProperty = $this->getReflectionProperty($object, $attribute);

src/Symfony/Component/Serializer/SerializerInterface.php

@@ -27,7 +27,7 @@ interface SerializerInterface
      *
      * @return string
      */
-    public function serialize($data, $format, array $context = []);
+    public function serialize($data, string $format, array $context = []);
 
     /**
      * Deserializes data into the given type.
@@ -39,5 +39,5 @@ interface SerializerInterface
      *
      * @return object
      */
-    public function deserialize($data, $type, $format, array $context = []);
+    public function deserialize($data, string $type, string $format, array $context = []);
 }