explicitly mark nullable parameters as nullable

src/Hub.php

@@ -35,9 +35,9 @@ final class Hub implements HubInterface
     public function __construct(
         string $url,
         TokenProviderInterface $jwtProvider,
-        TokenFactoryInterface $jwtFactory = null,
-        string $publicUrl = null,
-        HttpClientInterface $httpClient = null
+        ?TokenFactoryInterface $jwtFactory = null,
+        ?string $publicUrl = null,
+        ?HttpClientInterface $httpClient = null
     ) {
         $this->url = $url;
         $this->jwtProvider = $jwtProvider;
@@ -46,41 +46,26 @@ public function __construct(
         $this->httpClient = $httpClient ?? HttpClient::create();
     }
 
-    /**
-     * {@inheritDoc}
-     */
     public function getUrl(): string
     {
         return $this->url;
     }
 
-    /**
-     * {@inheritDoc}
-     */
     public function getPublicUrl(): string
     {
         return $this->publicUrl ?? $this->getUrl();
     }
 
-    /**
-     * {@inheritDoc}
-     */
     public function getProvider(): TokenProviderInterface
     {
         return $this->jwtProvider;
     }
 
-    /**
-     * {@inheritDoc}
-     */
     public function getFactory(): ?TokenFactoryInterface
     {
         return $this->jwtFactory;
     }
 
-    /**
-     * {@inheritDoc}
-     */
     public function publish(Update $update): string
     {
         $postData = [

src/HubRegistry.php

@@ -29,7 +29,7 @@ public function __construct(HubInterface $defaultHub, array $hubs = [])
         $this->hubs = $hubs;
     }
 
-    public function getHub(string $name = null): HubInterface
+    public function getHub(?string $name = null): HubInterface
     {
         if (null === $name) {
             return $this->defaultHub;

src/MockHub.php

@@ -31,8 +31,8 @@ public function __construct(
         string $url,
         TokenProviderInterface $jwtProvider,
         callable $publisher,
-        TokenFactoryInterface $jwtFactory = null,
-        string $publicUrl = null
+        ?TokenFactoryInterface $jwtFactory = null,
+        ?string $publicUrl = null
     ) {
         $this->url = $url;
         $this->jwtProvider = $jwtProvider;

src/Publisher.php

@@ -38,7 +38,7 @@ final class Publisher implements PublisherInterface
     /**
      * @param TokenProviderInterface|callable(Update $update):string $jwtProvider
      */
-    public function __construct(string $hubUrl, $jwtProvider, HttpClientInterface $httpClient = null)
+    public function __construct(string $hubUrl, $jwtProvider, ?HttpClientInterface $httpClient = null)
     {
         $this->hubUrl = $hubUrl;
         $this->jwtProvider = $jwtProvider;

src/Twig/MercureExtension.php

@@ -30,7 +30,7 @@ final class MercureExtension extends AbstractExtension
     private $authorization;
     private $requestStack;
 
-    public function __construct(HubRegistry $hubRegistry, Authorization $authorization = null, RequestStack $requestStack = null)
+    public function __construct(HubRegistry $hubRegistry, ?Authorization $authorization = null, ?RequestStack $requestStack = null)
     {
         $this->hubRegistry = $hubRegistry;
         $this->authorization = $authorization;

src/Update.php

@@ -35,7 +35,7 @@ final class Update
     /**
      * @param string|string[] $topics
      */
-    public function __construct($topics, string $data = '', bool $private = false, string $id = null, string $type = null, int $retry = null)
+    public function __construct($topics, string $data = '', bool $private = false, ?string $id = null, ?string $type = null, ?int $retry = null)
     {
         if (!\is_array($topics) && !\is_string($topics)) {
             throw new \InvalidArgumentException('$topics must be an array of strings or a string.');