Add Record/Level/LevelName type aliases and improve phpstan type coverage to level 6

src/Monolog/Handler/SwiftMailerHandler.php

@@ -21,14 +21,18 @@ use Swift;
  * SwiftMailerHandler uses Swift_Mailer to send the emails
  *
  * @author Gyula Sallai
+ *
+ * @phpstan-import-type Record from \Monolog\Logger
  */
 class SwiftMailerHandler extends MailHandler
 {
+    /** @var \Swift_Mailer */
     protected $mailer;
+    /** @var Swift_Message|callable(string, Record[]): Swift_Message */
     private $messageTemplate;
 
     /**
-     * @psalm-param Swift_Message|callable(string, array): Swift_Message $message
+     * @psalm-param Swift_Message|callable(string, Record[]): Swift_Message $message
      *
      * @param \Swift_Mailer          $mailer  The mailer to use
      * @param callable|Swift_Message $message An example message for real messages, only the body will be replaced
@@ -67,6 +71,8 @@ class SwiftMailerHandler extends MailHandler
      * @param  string        $content formatted email body to be sent
      * @param  array         $records Log records that formed the content
      * @return Swift_Message
+     *
+     * @phpstan-param Record[] $records
      */
     protected function buildMessage(string $content, array $records): Swift_Message
     {