Forward factories implemented by PSR-18 clients if any

Author: nicolas-grekas

src/Psr18Client.php

@@ -33,6 +33,13 @@ public function __construct(
         ?UploadedFileFactoryInterface $uploadedFileFactory = null,
         ?UriFactoryInterface $uriFactory = null
     ) {
+        $requestFactory ??= $client instanceof RequestFactoryInterface ? $client : null;
+        $responseFactory ??= $client instanceof ResponseFactoryInterface ? $client : null;
+        $serverRequestFactory ??= $client instanceof ServerRequestFactoryInterface ? $client : null;
+        $streamFactory ??= $client instanceof StreamFactoryInterface ? $client : null;
+        $uploadedFileFactory ??= $client instanceof UploadedFileFactoryInterface ? $client : null;
+        $uriFactory ??= $client instanceof UriFactoryInterface ? $client : null;
+
         parent::__construct($requestFactory, $responseFactory, $serverRequestFactory, $streamFactory, $uploadedFileFactory, $uriFactory);
 
         $this->client = $client ?? Psr18ClientDiscovery::find();