Explicitly mark parameter as nullable

src/Bundle/Routing/JWKSetLoader.php

@@ -29,12 +29,12 @@ public function add(string $pattern, string $name): void
         $this->routes->add(sprintf('jwkset_%s', $name), $route);
     }
 
-    public function load(mixed $resource, string $type = null): RouteCollection
+    public function load(mixed $resource, ?string $type = null): RouteCollection
     {
         return $this->routes;
     }
 
-    public function supports(mixed $resource, string $type = null): bool
+    public function supports(mixed $resource, ?string $type = null): bool
     {
         return $type === 'jwkset';
     }

src/Bundle/Serializer/JWESerializer.php

@@ -33,14 +33,14 @@ public function getSupportedTypes(?string $format): array
         ];
     }
 
-    public function supportsDenormalization(mixed $data, string $type, string $format = null, array $context = []): bool
+    public function supportsDenormalization(mixed $data, string $type, ?string $format = null, array $context = []): bool
     {
         return $type === JWE::class
             && class_exists(JWESerializerManager::class)
             && $this->formatSupported($format);
     }
 
-    public function denormalize(mixed $data, string $type, string $format = null, array $context = []): JWE
+    public function denormalize(mixed $data, string $type, ?string $format = null, array $context = []): JWE
     {
         if ($data instanceof JWE === false) {
             throw new LogicException('Expected data to be a JWE.');

src/Bundle/Serializer/JWSSerializer.php

@@ -33,14 +33,14 @@ public function getSupportedTypes(?string $format): array
         ];
     }
 
-    public function supportsDenormalization(mixed $data, string $type, string $format = null, array $context = []): bool
+    public function supportsDenormalization(mixed $data, string $type, ?string $format = null, array $context = []): bool
     {
         return $type === JWS::class
             && class_exists(JWSSerializerManager::class)
             && $this->formatSupported($format);
     }
 
-    public function denormalize(mixed $data, string $type, string $format = null, array $context = []): JWS
+    public function denormalize(mixed $data, string $type, ?string $format = null, array $context = []): JWS
     {
         if ($data instanceof JWS === false) {
             throw new LogicException('Expected data to be a JWS.');

src/Bundle/Services/JWEDecrypter.php

@@ -29,7 +29,7 @@ public function decryptUsingKeySet(
         JWE &$jwe,
         JWKSet $jwkset,
         int $recipient,
-        JWK &$jwk = null,
+        ?JWK &$jwk = null,
         ?JWK $senderKey = null
     ): bool {
         $success = parent::decryptUsingKeySet($jwe, $jwkset, $recipient, $jwk, $senderKey);

src/Bundle/Services/JWSVerifier.php

@@ -27,7 +27,7 @@ public function verifyWithKeySet(
         JWKSet $jwkset,
         int $signatureIndex,
         ?string $detachedPayload = null,
-        JWK &$jwk = null
+        ?JWK &$jwk = null
     ): bool {
         $success = parent::verifyWithKeySet($jws, $jwkset, $signatureIndex, $detachedPayload, $jwk);
         if ($success) {

src/Library/Console/KeyAnalyzerCommand.php

@@ -26,7 +26,7 @@ final class KeyAnalyzerCommand extends Command
 
     public function __construct(
         private readonly KeyAnalyzerManager $analyzerManager,
-        string $name = null
+        ?string $name = null
     ) {
         parent::__construct($name);
     }

src/Library/Console/KeysetAnalyzerCommand.php

@@ -29,7 +29,7 @@ final class KeysetAnalyzerCommand extends Command
     public function __construct(
         private readonly KeysetAnalyzerManager $keysetAnalyzerManager,
         private readonly KeyAnalyzerManager $keyAnalyzerManager,
-        string $name = null
+        ?string $name = null
     ) {
         parent::__construct($name);
     }

src/Library/Encryption/JWEDecrypter.php

@@ -115,7 +115,7 @@ public function decryptUsingKeySet(
         JWE &$jwe,
         JWKSet $jwkset,
         int $recipient,
-        JWK &$jwk = null,
+        ?JWK &$jwk = null,
         ?JWK $senderKey = null
     ): bool {
         if ($jwkset->count() === 0) {
@@ -142,7 +142,7 @@ private function decryptRecipientKey(
         JWE $jwe,
         JWKSet $jwkset,
         int $i,
-        JWK &$successJwk = null,
+        ?JWK &$successJwk = null,
         ?JWK $senderKey = null
     ): ?string {
         $recipient = $jwe->getRecipient($i);

src/Library/Signature/JWSVerifier.php

@@ -59,7 +59,7 @@ public function verifyWithKeySet(
         JWKSet $jwkset,
         int $signatureIndex,
         ?string $detachedPayload = null,
-        JWK &$jwk = null
+        ?JWK &$jwk = null
     ): bool {
         if ($jwkset->count() === 0) {
             throw new InvalidArgumentException('There is no key in the key set.');
@@ -78,7 +78,7 @@ private function verifySignature(
         JWKSet $jwkset,
         Signature $signature,
         ?string $detachedPayload = null,
-        JWK &$successJwk = null
+        ?JWK &$successJwk = null
     ): bool {
         $input = $this->getInputToVerify($jws, $signature, $detachedPayload);
         $algorithm = $this->getAlgorithm($signature);