Minor bugfixes detected with PHPStan

src/Api/HttpApi.php

@@ -34,7 +34,7 @@ abstract class HttpApi
     protected $httpClient;
 
     /**
-     * @var Hydrator
+     * @var null|Hydrator
      */
     protected $hydrator;
 
@@ -59,7 +59,7 @@ abstract class HttpApi
      */
     protected function hydrateResponse(ResponseInterface $response, string $class)
     {
-        if (!$this->hydrator) {
+        if (null === $this->hydrator) {
             return $response;
         }
 

src/Api/MailingList/Member.php

@@ -26,9 +26,9 @@ class Member extends HttpApi
     /**
      * Returns a paginated list of members of the mailing list.
      *
-     * @param string      $address    Address of the mailing list
-     * @param int         $limit      Maximum number of records to return (optional: 100 by default)
-     * @param string|null $subscribed `true` to lists subscribed, `false` for unsubscribed. list all if null
+     * @param string    $address    Address of the mailing list
+     * @param int       $limit      Maximum number of records to return (optional: 100 by default)
+     * @param bool|null $subscribed `true` to lists subscribed, `false` for unsubscribed. list all if null
      *
      * @return IndexResponse
      *

src/Api/Route.php

@@ -96,7 +96,7 @@ class Route extends HttpApi
      *
      * @param string      $routeId     Route ID returned by the Routes::index() method
      * @param string|null $expression  A filter expression like "match_recipient('.*@gmail.com')"
-     * @param array|null  $actions     Route action. This action is executed when the expression evaluates to True. Example: "forward('alice@example.com')"
+     * @param array       $actions     Route action. This action is executed when the expression evaluates to True. Example: "forward('alice@example.com')"
      * @param string|null $description An arbitrary string
      * @param int|null    $priority    Integer: smaller number indicates higher priority. Higher priority routes are handled first. Defaults to 0.
      *

src/Mailgun.php

@@ -12,7 +12,10 @@ declare(strict_types=1);
 namespace Mailgun;
 
 use Http\Client\Common\HttpMethodsClient;
+use Http\Client\HttpClient;
+use Mailgun\HttpClient\HttpClientConfigurator;
 use Mailgun\HttpClient\Plugin\History;
+use Mailgun\HttpClient\RequestBuilder;
 use Mailgun\Hydrator\ModelHydrator;
 use Mailgun\Hydrator\Hydrator;
 use Psr\Http\Message\ResponseInterface;
@@ -28,7 +31,7 @@ final class Mailgun
     private $apiKey;
 
     /**
-     * @var HttpMethodsClient
+     * @var HttpClient
      */
     private $httpClient;
 

src/Message/BatchMessage.php

@@ -85,7 +85,7 @@ class BatchMessage extends MessageBuilder
             $variables['id'] = $headerName.'_'.$this->counters['recipients'][$headerName];
         }
 
-        $this->batchRecipientAttributes[(string) $address] = $variables;
+        $this->batchRecipientAttributes[$address] = $variables;
 
         return $this;
     }

src/Message/MessageBuilder.php

@@ -306,9 +306,9 @@ class MessageBuilder
             throw LimitExceeded::create('campaigns', self::CAMPAIGN_ID_LIMIT);
         }
         if (isset($this->message['o:campaign'])) {
-            array_push($this->message['o:campaign'], (string) $campaignId);
+            array_push($this->message['o:campaign'], $campaignId);
         } else {
-            $this->message['o:campaign'] = [(string) $campaignId];
+            $this->message['o:campaign'] = [$campaignId];
         }
         ++$this->counters['attributes']['campaign_id'];
 

src/Model/Domain/ConnectionResponse.php

@@ -28,13 +28,10 @@ final class ConnectionResponse implements ApiResponse
      */
     private $requireTLS;
 
-    /**
-     * @return self
-     */
-    public static function create(array $data)
+    public static function create(array $data): ?self
     {
         if (!isset($data['connection'])) {
-            return;
+            return null;
         }
         $connSettings = $data['connection'];
 

src/Model/Event/Event.php

@@ -39,7 +39,7 @@ final class Event
     private $eventDate;
 
     /**
-     * @var array|string[]
+     * @var string[]
      */
     private $tags = [];
 
@@ -64,7 +64,7 @@ final class Event
     private $deliveryStatus;
 
     /**
-     * @var array|string[]
+     * @var string[]
      */
     private $campaigns = [];
 
@@ -232,7 +232,7 @@ final class Event
     }
 
     /**
-     * @return array|\string[]
+     * @return string[]
      */
     public function getTags()
     {
@@ -240,7 +240,7 @@ final class Event
     }
 
     /**
-     * @param array|\string[] $tags
+     * @param string[] $tags
      */
     private function setTags($tags)
     {
@@ -296,7 +296,7 @@ final class Event
     }
 
     /**
-     * @return array|\string[]
+     * @return string[]
      */
     public function getCampaigns()
     {
@@ -304,7 +304,7 @@ final class Event
     }
 
     /**
-     * @param array|\string[] $campaigns
+     * @param string[] $campaigns
      */
     private function setCampaigns($campaigns)
     {

src/Model/PaginationResponse.php

@@ -21,49 +21,38 @@ trait PaginationResponse
      */
     protected $paging;
 
-    /**
-     * @return string
-     */
-    public function getNextUrl()
+    public function getNextUrl(): ?string
     {
         if (!isset($this->paging['next'])) {
-            return;
+            return null;
         }
 
         return $this->paging['next'];
     }
 
-    /**
-     * @return string
-     */
-    public function getPreviousUrl()
+
+    public function getPreviousUrl(): ?string
     {
         if (!isset($this->paging['previous'])) {
-            return;
+            return null;
         }
 
         return $this->paging['previous'];
     }
 
-    /**
-     * @return string
-     */
-    public function getFirstUrl()
+    public function getFirstUrl(): ?string
     {
         if (!isset($this->paging['first'])) {
-            return;
+            return null;
         }
 
         return $this->paging['first'];
     }
 
-    /**
-     * @return string
-     */
-    public function getLastUrl()
+    public function getLastUrl(): ?string
     {
         if (!isset($this->paging['last'])) {
-            return;
+            return null;
         }
 
         return $this->paging['last'];

src/Model/Route/Action.php

@@ -24,7 +24,6 @@ final class Action
     /**
      * Action Named Constructor to build several Action DTOs provided by an Array.
      *
-     *
      * @return Action[]
      */
     public static function createMultiple(array $data)
@@ -38,12 +37,7 @@ final class Action
         return $items;
     }
 
-    /**
-     * Action Private Constructor.
-     *
-     * @param $action
-     */
-    private function __construct($action)
+    private function __construct(string $action)
     {
         $this->action = $action;
     }

src/Model/Stats/AllResponseItem.php

@@ -59,7 +59,7 @@ final class AllResponseItem
      * @param string    $id
      * @param string    $event
      * @param string    $totalCount
-     * @param \string[] $tags
+     * @param string[] $tags
      */
     private function __construct($id, $event, $totalCount, array $tags, \DateTime $createdAt)
     {