Finalize remove mixed types

Author: vpietri

Block/Tab/Panel.php

@@ -30,11 +30,9 @@ public function __construct(
     }
 
     /**
-     * Used only in phtml
-     *
      * @param $key
      * @param $index
-     * @return array|\Magento\Framework\DataObject|mixed|string|null
+     * @return array|\Magento\Framework\DataObject|string|null
      * @throws \Exception
      */
     public function getData($key = '', $index = null)

Helper/Register.php

@@ -103,53 +103,56 @@ public function getContextData()
     }
 
     /**
-     * @return mixed
+     * @return \Magento\Framework\DataObject|null
      */
     public function getObservers()
     {
         return $this->getRegisteredData('observers');
     }
 
     /**
-     * @return mixed
+     * @return \Magento\Framework\DataObject|null
      */
     public function getEvents()
     {
         return $this->getRegisteredData('events');
     }
 
     /**
-     * @return mixed
+     * @return \Magento\Framework\DataObject|null
      */
     public function getCollections()
     {
         return $this->getRegisteredData('collections');
     }
-    /**
-     * @return array
-     */
 
     /**
-     * @return mixed
+     * @return \Magento\Framework\DataObject|null
      */
     public function getModels()
     {
         return $this->getRegisteredData('models');
     }
 
     /**
-     * @return mixed
+     * @return \Magento\Framework\DataObject|null
      */
     public function getBlocks()
     {
         return $this->getRegisteredData('blocks');
     }
 
+    /**
+     * @return \Magento\Framework\DataObject|null
+     */
     public function getLayoutHandles()
     {
         return $this->getRegisteredData('layout_handles');
     }
 
+    /**
+     * @return \Magento\Framework\DataObject|null
+     */
     public function getLayoutHierarchy()
     {
         return $this->getRegisteredData('layout_tree_blocks_hierarchy');

Observer/LayoutGenerateBlocksAfterObserver.php

@@ -47,7 +47,7 @@ public function execute(Observer $observer)
 
     /**
      * @param \Magento\Framework\View\LayoutInterface $layout
-     * @return mixed
+     * @return array
      */
     protected function getHandles($layout)
     {

Plugin/Framework/App/Cache.php

@@ -25,14 +25,13 @@ public function beforeLoad(CacheInterface $subject, string $identifier)
         $this->cacheService->addCache('load', $identifier);
     }
 
-
     /**
      * @param CacheInterface $subject
      * @param string $data
      * @param string $identifier
      * @param array $tags
      * @param $lifeTime
-     * @return mixed
+     * @return void
      */
     public function beforeSave(
         CacheInterface $subject,

Plugin/PageCache/FrontController/BuiltinPlugin.php

@@ -16,12 +16,14 @@ class BuiltinPlugin
      */
     private $cacheService;
 
+    /**
+     * @param \ADM\QuickDevBar\Service\App\Cache $cacheService
+     */
     public function __construct(\ADM\QuickDevBar\Service\App\Cache $cacheService)
     {
         $this->cacheService = $cacheService;
     }
 
-
     /**
      * @param PageCache $subject
      * @param string $identifier
@@ -31,14 +33,13 @@ public function beforeLoad(PageCache $subject, string $identifier)
         $this->cacheService->addCache('load', $identifier);
     }
 
-
     /**
      * @param PageCache $subject
      * @param string $data
      * @param string $identifier
      * @param array $tags
      * @param $lifeTime
-     * @return mixed
+     * @return void
      */
     public function beforeSave(
         PageCache $subject,