diff --git a/src/DataCollector/PwaCollector.php b/src/DataCollector/PwaCollector.php
index 0fb7862..ddf3916 100644
--- a/src/DataCollector/PwaCollector.php
+++ b/src/DataCollector/PwaCollector.php
@@ -48,7 +48,7 @@ public function __construct(
     ) {
     }
 
-    public function collect(Request $request, Response $response, Throwable $exception = null): void
+    public function collect(Request $request, Response $response, ?Throwable $exception = null): void
     {
         $jsonOptions = [
             AbstractObjectNormalizer::SKIP_UNINITIALIZED_VALUES => true,
diff --git a/src/Normalizer/AssetNormalizer.php b/src/Normalizer/AssetNormalizer.php
index 0b108d3..dc40999 100644
--- a/src/Normalizer/AssetNormalizer.php
+++ b/src/Normalizer/AssetNormalizer.php
@@ -21,29 +21,29 @@ public function __construct(
     /**
      * @return array{src: string, sizes?: string, form_factor?: string, label?: string, platform?: string, format?: string}
      */
-    public function normalize(mixed $object, ?string $format = null, array $context = []): string
+    public function normalize(mixed $data, ?string $format = null, array $context = []): string
     {
-        assert($object instanceof Asset);
+        assert($data instanceof Asset);
         $url = null;
-        if (! str_starts_with($object->src, '/')) {
-            $asset = $this->assetMapper->getAsset($object->src);
+        if (! str_starts_with($data->src, '/')) {
+            $asset = $this->assetMapper->getAsset($data->src);
             $url = $asset?->publicPath;
         }
         if ($url === null) {
-            $url = $object->src;
+            $url = $data->src;
         }
 
         return $url;
     }
 
-    public function denormalize(mixed $data, string $type, string $format = null, array $context = []): mixed
+    public function denormalize(mixed $data, string $type, ?string $format = null, array $context = []): mixed
     {
         assert(is_string($data));
 
         return Asset::create($data);
     }
 
-    public function supportsNormalization(mixed $data, string $format = null, array $context = []): bool
+    public function supportsNormalization(mixed $data, ?string $format = null, array $context = []): bool
     {
         return $data instanceof Asset;
     }
@@ -51,7 +51,7 @@ public function supportsNormalization(mixed $data, string $format = null, array
     public function supportsDenormalization(
         mixed $data,
         string $type,
-        string $format = null,
+        ?string $format = null,
         array $context = []
     ): bool {
         return $type === Asset::class;
diff --git a/src/Normalizer/IconNormalizer.php b/src/Normalizer/IconNormalizer.php
index 3b26704..1043f31 100644
--- a/src/Normalizer/IconNormalizer.php
+++ b/src/Normalizer/IconNormalizer.php
@@ -23,17 +23,17 @@ public function __construct(
     /**
      * @return array{src: string, sizes?: string, type?: string, purpose?: string}
      */
-    public function normalize(mixed $object, ?string $format = null, array $context = []): array
+    public function normalize(mixed $data, ?string $format = null, array $context = []): array
     {
-        assert($object instanceof Icon);
-        $icon = $this->iconResolver->getIcon($object);
-        $imageType = $this->iconResolver->getType($object->type, $icon->url);
+        assert($data instanceof Icon);
+        $icon = $this->iconResolver->getIcon($data);
+        $imageType = $this->iconResolver->getType($data->type, $icon->url);
 
         $result = [
             'src' => $icon->url,
-            'sizes' => $object->getSizeList(),
+            'sizes' => $data->getSizeList(),
             'type' => $imageType,
-            'purpose' => $object->purpose,
+            'purpose' => $data->purpose,
         ];
 
         $cleanup = static fn (array $data): array => array_filter(
@@ -44,7 +44,7 @@ public function normalize(mixed $object, ?string $format = null, array $context
         return $cleanup($result);
     }
 
-    public function supportsNormalization(mixed $data, string $format = null, array $context = []): bool
+    public function supportsNormalization(mixed $data, ?string $format = null, array $context = []): bool
     {
         return $data instanceof Icon;
     }
diff --git a/src/Normalizer/ScreenshotNormalizer.php b/src/Normalizer/ScreenshotNormalizer.php
index 1e58d3b..cedce7f 100644
--- a/src/Normalizer/ScreenshotNormalizer.php
+++ b/src/Normalizer/ScreenshotNormalizer.php
@@ -28,23 +28,23 @@ public function __construct(
     /**
      * @return array{src: string, sizes?: string, form_factor?: string, label?: string, platform?: string, format?: string}
      */
-    public function normalize(mixed $object, ?string $format = null, array $context = []): array
+    public function normalize(mixed $data, ?string $format = null, array $context = []): array
     {
-        assert($object instanceof Screenshot);
+        assert($data instanceof Screenshot);
         $asset = null;
-        $imageType = $object->type;
-        if ($imageType === null && ! str_starts_with($object->src->src, '/')) {
-            $asset = $this->assetMapper->getAsset($object->src->src);
+        $imageType = $data->type;
+        if ($imageType === null && ! str_starts_with($data->src->src, '/')) {
+            $asset = $this->assetMapper->getAsset($data->src->src);
             $imageType = $this->getType($asset);
         }
-        ['sizes' => $sizes, 'formFactor' => $formFactor] = $this->getSizes($object, $asset);
+        ['sizes' => $sizes, 'formFactor' => $formFactor] = $this->getSizes($data, $asset);
 
         $result = [
-            'src' => $this->normalizer->normalize($object->src, $format, $context),
+            'src' => $this->normalizer->normalize($data->src, $format, $context),
             'sizes' => $sizes,
             'form_factor' => $formFactor,
-            'label' => $object->label,
-            'platform' => $object->platform,
+            'label' => $data->label,
+            'platform' => $data->platform,
             'format' => $imageType,
         ];
 
@@ -55,7 +55,7 @@ public function normalize(mixed $object, ?string $format = null, array $context
         return $cleanup($result);
     }
 
-    public function supportsNormalization(mixed $data, string $format = null, array $context = []): bool
+    public function supportsNormalization(mixed $data, ?string $format = null, array $context = []): bool
     {
         return $data instanceof Screenshot;
     }
@@ -105,8 +105,7 @@ private function getType(?MappedAsset $asset): ?string
             return null;
         }
 
-        $mime = MimeTypes::getDefault();
-        return $mime->guessMimeType($asset->sourcePath);
+        return MimeTypes::getDefault()->guessMimeType($asset->sourcePath);
     }
 
     private function getFormFactor(?int $width, ?int $height): ?string
diff --git a/src/Normalizer/ServiceWorkerNormalizer.php b/src/Normalizer/ServiceWorkerNormalizer.php
index 98cce36..2480074 100644
--- a/src/Normalizer/ServiceWorkerNormalizer.php
+++ b/src/Normalizer/ServiceWorkerNormalizer.php
@@ -13,14 +13,14 @@
     /**
      * @return array{scope?: string, src: string, use_cache?: bool}
      */
-    public function normalize(mixed $object, ?string $format = null, array $context = []): array
+    public function normalize(mixed $data, ?string $format = null, array $context = []): array
     {
-        assert($object instanceof ServiceWorker);
+        assert($data instanceof ServiceWorker);
 
         $result = [
-            'src' => '/' . trim($object->dest, '/'),
-            'scope' => $object->scope,
-            'use_cache' => $object->useCache,
+            'src' => '/' . trim($data->dest, '/'),
+            'scope' => $data->scope,
+            'use_cache' => $data->useCache,
         ];
 
         $cleanup = static fn (array $data): array => array_filter(
@@ -30,7 +30,7 @@ public function normalize(mixed $object, ?string $format = null, array $context
         return $cleanup($result);
     }
 
-    public function supportsNormalization(mixed $data, string $format = null, array $context = []): bool
+    public function supportsNormalization(mixed $data, ?string $format = null, array $context = []): bool
     {
         return $data instanceof ServiceWorker;
     }
diff --git a/src/Normalizer/UrlNormalizer.php b/src/Normalizer/UrlNormalizer.php
index df4c12e..84ebafb 100644
--- a/src/Normalizer/UrlNormalizer.php
+++ b/src/Normalizer/UrlNormalizer.php
@@ -24,31 +24,31 @@ public function __construct(
     ) {
     }
 
-    public function normalize(mixed $object, ?string $format = null, array $context = []): string
+    public function normalize(mixed $data, ?string $format = null, array $context = []): string
     {
-        assert($object instanceof Url);
+        assert($data instanceof Url);
 
         // If the path is a valid URL, we return it directly
-        if (str_starts_with($object->path, '/') && filter_var($object->path, FILTER_VALIDATE_URL) !== false) {
-            return $object->path;
+        if (str_starts_with($data->path, '/') && filter_var($data->path, FILTER_VALIDATE_URL) !== false) {
+            return $data->path;
         }
 
         // If the path is an asset, we return the public path
-        $asset = $this->assetMapper->getAsset($object->path);
+        $asset = $this->assetMapper->getAsset($data->path);
         if ($asset !== null) {
             return $asset->publicPath;
         }
 
         // Otherwise, we try to generate the URL
         try {
-            return $this->router->generate($object->path, $object->params, $object->pathTypeReference);
+            return $this->router->generate($data->path, $data->params, $data->pathTypeReference);
         } catch (Throwable) {
             // If the URL cannot be generated, we return the path as is
-            return $object->path;
+            return $data->path;
         }
     }
 
-    public function supportsNormalization(mixed $data, string $format = null, array $context = []): bool
+    public function supportsNormalization(mixed $data, ?string $format = null, array $context = []): bool
     {
         return $data instanceof Url;
     }