Mark classes as readonly where appropriate

phpstan-baseline.neon

@@ -66,12 +66,6 @@ parameters:
 			count: 3
 			path: src/Metadata/AttributeMetadataFactory.php
 
-		-
-			message: '#^Property Patchlevel\\Hydrator\\Metadata\\AttributeMetadataFactory\:\:\$guesser \(Patchlevel\\Hydrator\\Guesser\\Guesser\|null\) is never assigned null so it can be removed from the property type\.$#'
-			identifier: property.unusedType
-			count: 1
-			path: src/Metadata/AttributeMetadataFactory.php
-
 		-
 			message: '#^Property Patchlevel\\Hydrator\\Metadata\\ClassMetadata\<T of object \= object\>\:\:\$reflection \(ReflectionClass\<T of object \= object\>\) does not accept ReflectionClass\<object\>\.$#'
 			identifier: assign.propertyType

src/Guesser/BuiltInGuesser.php

@@ -16,10 +16,10 @@
 use Symfony\Component\TypeInfo\Type\BackedEnumType;
 use Symfony\Component\TypeInfo\Type\ObjectType;
 
-final class BuiltInGuesser implements Guesser
+final readonly class BuiltInGuesser implements Guesser
 {
     public function __construct(
-        private readonly bool $fallbackObjectNormalizer = true,
+        private bool $fallbackObjectNormalizer = true,
     ) {
     }
 

src/Guesser/ChainGuesser.php

@@ -7,11 +7,11 @@
 use Patchlevel\Hydrator\Normalizer\Normalizer;
 use Symfony\Component\TypeInfo\Type\ObjectType;
 
-final class ChainGuesser implements Guesser
+final readonly class ChainGuesser implements Guesser
 {
     /** @param iterable<Guesser> $guessers */
     public function __construct(
-        private readonly iterable $guessers,
+        private iterable $guessers,
     ) {
     }
 

src/Metadata/AttributeMetadataFactory.php

@@ -42,7 +42,7 @@ final class AttributeMetadataFactory implements MetadataFactory
 
     private readonly TypeResolver $typeResolver;
 
-    private readonly Guesser|null $guesser;
+    private readonly Guesser $guesser;
 
     public function __construct(
         TypeResolver|null $typeResolver = null,
@@ -375,6 +375,7 @@ private function getNormalizer(ReflectionProperty $reflectionProperty): Normaliz
 
     private function findNormalizerOnProperty(ReflectionProperty $reflectionProperty): Normalizer|null
     {
+        /** @var list<ReflectionAttribute<Normalizer>> $attributeReflectionList */
         $attributeReflectionList = $reflectionProperty->getAttributes(
             Normalizer::class,
             ReflectionAttribute::IS_INSTANCEOF,
@@ -479,6 +480,7 @@ private function findNormalizerOnClass(string $class): Normalizer|null
     {
         $reflectionClass = new ReflectionClass($class);
 
+        /** @var list<ReflectionAttribute<Normalizer>> $attributes */
         $attributes = $reflectionClass->getAttributes(
             Normalizer::class,
             ReflectionAttribute::IS_INSTANCEOF,

src/Metadata/CallbackMetadata.php

@@ -12,10 +12,10 @@
  *     method: string,
  * }
  */
-final class CallbackMetadata
+final readonly class CallbackMetadata
 {
     public function __construct(
-        private readonly ReflectionMethod $reflection,
+        private ReflectionMethod $reflection,
     ) {
     }
 

src/Metadata/ClassMetadata.php

@@ -17,7 +17,7 @@
  * }
  * @template T of object = object
  */
-final class ClassMetadata
+final readonly class ClassMetadata
 {
     /**
      * @param ReflectionClass<T>     $reflection
@@ -26,12 +26,12 @@ final class ClassMetadata
      * @param list<CallbackMetadata> $preExtractCallbacks
      */
     public function __construct(
-        private readonly ReflectionClass $reflection,
-        private readonly array $properties = [],
-        private readonly string|null $dataSubjectIdField = null,
-        private readonly array $postHydrateCallbacks = [],
-        private readonly array $preExtractCallbacks = [],
-        private readonly bool|null $lazy = null,
+        private ReflectionClass $reflection,
+        private array $properties = [],
+        private string|null $dataSubjectIdField = null,
+        private array $postHydrateCallbacks = [],
+        private array $preExtractCallbacks = [],
+        private bool|null $lazy = null,
     ) {
     }
 

src/Metadata/Psr16MetadataFactory.php

@@ -6,11 +6,11 @@
 
 use Psr\SimpleCache\CacheInterface;
 
-final class Psr16MetadataFactory implements MetadataFactory
+final readonly class Psr16MetadataFactory implements MetadataFactory
 {
     public function __construct(
-        private readonly MetadataFactory $metadataFactory,
-        private readonly CacheInterface $cache,
+        private MetadataFactory $metadataFactory,
+        private CacheInterface $cache,
     ) {
     }
 

src/Metadata/Psr6MetadataFactory.php

@@ -6,11 +6,11 @@
 
 use Psr\Cache\CacheItemPoolInterface;
 
-final class Psr6MetadataFactory implements MetadataFactory
+final readonly class Psr6MetadataFactory implements MetadataFactory
 {
     public function __construct(
-        private readonly MetadataFactory $metadataFactory,
-        private readonly CacheItemPoolInterface $cache,
+        private MetadataFactory $metadataFactory,
+        private CacheItemPoolInterface $cache,
     ) {
     }
 

src/Normalizer/ArrayNormalizer.php

@@ -13,10 +13,10 @@
 use function is_array;
 
 #[Attribute(Attribute::TARGET_PROPERTY)]
-final class ArrayNormalizer implements Normalizer, TypeAwareNormalizer, HydratorAwareNormalizer
+final readonly class ArrayNormalizer implements Normalizer, TypeAwareNormalizer, HydratorAwareNormalizer
 {
     public function __construct(
-        private readonly Normalizer $normalizer,
+        private Normalizer $normalizer,
     ) {
     }
 

src/Normalizer/ArrayShapeNormalizer.php

@@ -13,11 +13,11 @@
 use function is_array;
 
 #[Attribute(Attribute::TARGET_PROPERTY)]
-final class ArrayShapeNormalizer implements Normalizer, TypeAwareNormalizer, HydratorAwareNormalizer
+final readonly class ArrayShapeNormalizer implements Normalizer, TypeAwareNormalizer, HydratorAwareNormalizer
 {
     /** @param array<array-key, Normalizer> $normalizerMap */
     public function __construct(
-        private readonly array $normalizerMap,
+        private array $normalizerMap,
     ) {
     }
 

src/Normalizer/DateTimeImmutableNormalizer.php

@@ -10,10 +10,10 @@
 use function is_string;
 
 #[Attribute(Attribute::TARGET_PROPERTY)]
-final class DateTimeImmutableNormalizer implements Normalizer
+final readonly class DateTimeImmutableNormalizer implements Normalizer
 {
     public function __construct(
-        private readonly string $format = DateTimeImmutable::ATOM,
+        private string $format = DateTimeImmutable::ATOM,
     ) {
     }
 

src/Normalizer/DateTimeNormalizer.php

@@ -10,10 +10,10 @@
 use function is_string;
 
 #[Attribute(Attribute::TARGET_PROPERTY)]
-final class DateTimeNormalizer implements Normalizer
+final readonly class DateTimeNormalizer implements Normalizer
 {
     public function __construct(
-        private readonly string $format = DateTime::ATOM,
+        private string $format = DateTime::ATOM,
     ) {
     }
 

src/Normalizer/DateTimeZoneNormalizer.php

@@ -10,7 +10,7 @@
 use function is_string;
 
 #[Attribute(Attribute::TARGET_PROPERTY)]
-final class DateTimeZoneNormalizer implements Normalizer
+final readonly class DateTimeZoneNormalizer implements Normalizer
 {
     public function normalize(mixed $value): string|null
     {