Change the implicit nullable type declaration to a nullable type declaration (#66)

Author: stsepelin

src/ConnectionManager.php

@@ -54,7 +54,7 @@ public function __construct(Application $application, array $config)
      * @throws ConnectionNotAvailableException
      * @throws ProtocolNotSupportedException
      */
-    public function connection(string $name = null): MqttClientContract
+    public function connection(?string $name = null): MqttClientContract
     {
         if ($name === null) {
             $name = $this->defaultConnection;
@@ -79,7 +79,7 @@ public function connection(string $name = null): MqttClientContract
      * @param string|null $connection
      * @throws DataTransferException
      */
-    public function disconnect(string $connection = null): void
+    public function disconnect(?string $connection = null): void
     {
         if ($connection === null) {
             $connection = $this->defaultConnection;
@@ -106,7 +106,7 @@ public function disconnect(string $connection = null): void
      * @throws ProtocolNotSupportedException
      * @throws RepositoryException
      */
-    public function publish(string $topic, string $message, bool $retain = false, string $connection = null): void
+    public function publish(string $topic, string $message, bool $retain = false, ?string $connection = null): void
     {
         $client = $this->connection($connection);
 

src/Facades/MQTT.php

@@ -9,9 +9,9 @@
 use PhpMqtt\Client\Contracts\MqttClient;
 
 /**
- * @method static MqttClient connection(string $name = null)
- * @method static void disconnect(string $connection = null)
- * @method static void publish(string $topic, string $message, bool $retain = false, string $connection = null)
+ * @method static MqttClient connection(string|null $name = null)
+ * @method static void disconnect(string|null $connection = null)
+ * @method static void publish(string $topic, string $message, bool $retain = false, string|null $connection = null)
  *
  * @package PhpMqtt\Client\Facades
  * @see ConnectionManager
@@ -21,9 +21,9 @@ class MQTT extends Facade
     /**
      * Get the registered name of the component.
      *
-     * @return string
+     * @return class-string
      */
-    protected static function getFacadeAccessor()
+    protected static function getFacadeAccessor(): string
     {
         return ConnectionManager::class;
     }