Fix more phpstan level 6 errors

.phpstan.neon

@@ -1,5 +1,5 @@
 parameters:
-    level: 5
+    level: 6
 
     paths:
         - src/

src/Redmine/Client/ClientApiTrait.php

@@ -12,6 +12,9 @@
  */
 trait ClientApiTrait
 {
+    /**
+     * @var array<Api>
+     */
     private array $apiInstances = [];
 
     private array $apiClassnames = [

src/Redmine/Client/NativeCurlClient.php

@@ -24,8 +24,20 @@ final class NativeCurlClient implements Client, HttpClient
     private int $lastResponseStatusCode = 0;
     private string $lastResponseContentType = '';
     private string $lastResponseBody = '';
+
+    /**
+     * @var array<int,mixed>
+     */
     private array $curlOptions = [];
+
+    /**
+     * @var array<string>
+     */
     private array $httpHeaders = [];
+
+    /**
+     * @var array<string>
+     */
     private array $httpHeadersNames = [];
     private ?int $port = null;
 
@@ -194,6 +206,8 @@ public function unsetCurlOption(int $option): void
 
     /**
      * Set multiple HTTP headers.
+     *
+     * @param array<mixed> $headers
      */
     private function setHttpHeaders(array $headers): void
     {
@@ -339,6 +353,9 @@ private function createCurl(string $method, string $path, string $body = '', str
         return $curl;
     }
 
+    /**
+     * @return array<string>
+     */
     private function createHttpHeader(string $path, string $contentType = ''): array
     {
         // Additional request headers

src/Redmine/Http/HttpFactory.php

@@ -14,9 +14,9 @@ final class HttpFactory
     public static function makeResponse(int $statusCode, string $contentType, string $content): Response
     {
         return new class ($statusCode, $contentType, $content) implements Response {
-            private $statusCode;
-            private $contentType;
-            private $body;
+            private int $statusCode;
+            private string $contentType;
+            private string $body;
 
             public function __construct(int $statusCode, string $contentType, string $body)
             {
@@ -45,10 +45,10 @@ public function getContent(): string
     public static function makeRequest(string $method, string $path, string $contentType = '', string $content = ''): Request
     {
         return new class ($method, $path, $contentType, $content) implements Request {
-            private $method;
-            private $path;
-            private $contentType;
-            private $content;
+            private string $method;
+            private string $path;
+            private string $contentType;
+            private string $content;
 
             public function __construct(string $method, string $path, string $contentType, string $content)
             {

src/Redmine/Serializer/JsonSerializer.php

@@ -23,6 +23,8 @@ public static function createFromString(string $data): self
     }
 
     /**
+     * @param array<mixed> $data
+     *
      * @throws SerializerException if $data could not be serialized to JSON
      */
     public static function createFromArray(array $data): self
@@ -77,6 +79,9 @@ private function decode(string $encoded): void
         }
     }
 
+    /**
+     * @param array<mixed> $normalized
+     */
     private function encode(array $normalized): void
     {
         $this->normalized = $normalized;

src/Redmine/Serializer/PathSerializer.php

@@ -9,6 +9,9 @@
  */
 final class PathSerializer implements Stringable
 {
+    /**
+     * @param array<string> $queryParams
+     */
     public static function create(string $path, array $queryParams = []): self
     {
         $serializer = new self();
@@ -20,6 +23,9 @@ public static function create(string $path, array $queryParams = []): self
 
     private string $path;
 
+    /**
+     * @var array<string>
+     */
     private array $queryParams;
 
     private function __construct()

src/Redmine/Serializer/XmlSerializer.php

@@ -25,6 +25,8 @@ public static function createFromString(string $data): self
     }
 
     /**
+     * @param array<string,mixed> $data
+     *
      * @throws SerializerException if $data could not be serialized to XML
      */
     public static function createFromArray(array $data): self
@@ -105,6 +107,11 @@ private function normalize(SimpleXMLElement $deserialized): void
         $this->normalized = JsonSerializer::createFromString($serialized)->getNormalized();
     }
 
+    /**
+     * @param array<mixed> $normalized
+     *
+     * @throws SerializerException
+     */
     private function denormalize(array $normalized): void
     {
         $this->normalized = $normalized;
@@ -136,7 +143,10 @@ private function denormalize(array $normalized): void
         $this->encoded = $this->deserialized->asXml();
     }
 
-    private function createXmlElement(string $rootElementName, $params): SimpleXMLElement
+    /**
+     * @param array<mixed> $params
+     */
+    private function createXmlElement(string $rootElementName, array $params): SimpleXMLElement
     {
         $value = '';
         if (! is_array($params)) {
@@ -154,6 +164,10 @@ private function createXmlElement(string $rootElementName, $params): SimpleXMLEl
         return $xml;
     }
 
+    /**
+     * @param string|int $k
+     * @param mixed $v
+     */
     private function addChildToXmlElement(SimpleXMLElement $xml, $k, $v): void
     {
         $specialParams = [
@@ -196,8 +210,8 @@ private function addChildToXmlElement(SimpleXMLElement $xml, $k, $v): void
     /**
      * Attaches Custom Fields to XML element.
      *
-     * @param SimpleXMLElement $xml    XML Element the custom fields are attached to
-     * @param array            $fields array of fields to attach, each field needs name, id and value set
+     * @param SimpleXMLElement     $xml    XML Element the custom fields are attached to
+     * @param array<array<string>> $fields array of fields to attach, each field needs name, id and value set
      *
      * @see http://www.redmine.org/projects/redmine/wiki/Rest_api#Working-with-custom-fields
      */

tests/Unit/Serializer/XmlSerializerTest.php

@@ -122,6 +122,9 @@ public function testCreateFromArrayEncodesToExpectedString(array $data, $expecte
         $this->assertXmlStringEqualsXmlString($expected, $serializer->__toString());
     }
 
+    /**
+     * @return array<string,mixed>
+     */
     public static function getNormalizedToEncodedData(): array
     {
         return [
@@ -298,6 +301,8 @@ public static function getNormalizedToEncodedData(): array
 
     /**
      * @dataProvider getInvalidSerializedData
+     *
+     * @param array<int,mixed> $data
      */
     #[DataProvider('getInvalidSerializedData')]
     public function testCreateFromArrayWithInvalidDataThrowsException(string $message, array $data): void
@@ -308,9 +313,12 @@ public function testCreateFromArrayWithInvalidDataThrowsException(string $messag
         XmlSerializer::createFromArray($data);
     }
 
+    /**
+     * @return array<string,mixed>
+     */
     public static function getInvalidSerializedData(): array
     {
-        return[
+        return [
             'invalid element name as start tag' => [
                 'Could not create XML from array: "StartTag: invalid element name' . "\n" . '", "Extra content at the end of the document' . "\n" . '"',
                 ['0' => ['foobar']],