Add Module.stub.

extension.neon

@@ -3,6 +3,7 @@ parameters:
         config_path: null
     stubFiles:
         - stubs/BaseYii.stub
+        - stubs/Module.stub
 
 parametersSchema:
 	yii2: structure([

phpstan.neon

@@ -12,6 +12,7 @@ parameters:
 
     paths:
         - src
+        - tests
 
     scanFiles:
         - vendor/yiisoft/yii2/Yii.php

stubs/Module.stub

@@ -0,0 +1,18 @@
+<?php
+
+namespace yii\base;
+
+use yii\mail\MailerInterface;
+use yii\web\Request;
+use yii\web\Session;
+
+/**
+ * Module is the base class for module and application classes.
+ *
+ * @property MailerInterface $mailer The mailer component. This property is read-only.
+ * @property Session $session The session component. This property is read-only.
+ * @property Request $request The request component. This property is read-only.
+ */
+class Module
+{
+}

tests/Yii/MyController.php

@@ -77,6 +77,10 @@ public function actionMy(): void
 
         $values = Yii::$app->request->headers->get('X-Key', '', false);
 
+        $mailer = $this->module->mailer;
+        $session = $this->module->session;
+        $request = $this->module->request;
+
         reset($values);
     }
 }