refactoring: Add property's type declaration

Helper/SendCustomer.php

@@ -28,27 +28,27 @@ class SendCustomer extends AbstractHelper
     /**
      * @var array
      */
-    protected $data;
+    protected array $data;
 
     /**
      * @var StoreRepositoryInterface
      */
-    protected $storeRepository;
+    protected StoreRepositoryInterface $storeRepository;
 
     /**
      * @var Filesystem
      */
-    protected $filesystem;
+    protected Filesystem $filesystem;
 
     /**
      * @var DirectoryList
      */
-    protected $directoryList;
+    protected DirectoryList $directoryList;
 
     /**
      * @var Csv
      */
-    protected $csvProcessor;
+    protected Csv $csvProcessor;
 
     /**
      * SendCustomer constructor.

Observer/CustomerRegisterSuccess.php

@@ -22,7 +22,7 @@ class CustomerRegisterSuccess implements ObserverInterface
     /**
      * @var SendCustomer
      */
-    protected $sendCustomer;
+    protected SendCustomer $sendCustomer;
 
     /**
      * CustomerRegisterSuccess constructor.