Add regions for Belarus

Author: DmitryFurs

app/code/Magento/Directory/Setup/Patch/Data/AddDataForBelarus.php

@@ -40,16 +40,20 @@ public function __construct(
     }
 
     /**
-     * @inheritdoc
+     * Add country-region data for Belarus.
+     *
+     * @return $this
      */
-    public function apply()
+    public function apply(): DataPatchInterface
     {
         /** @var DataInstaller $dataInstaller */
         $dataInstaller = $this->dataInstallerFactory->create();
         $dataInstaller->addCountryRegions(
             $this->moduleDataSetup->getConnection(),
             $this->getDataForBelarus()
         );
+
+        return $this;
     }
 
     /**
@@ -71,19 +75,19 @@ private function getDataForBelarus(): array
     }
 
     /**
-     * @inheritdoc
+     * {@inheritdoc}
      */
-    public static function getDependencies()
+    public static function getDependencies(): array
     {
         return [
             InitializeDirectoryData::class,
         ];
     }
 
     /**
-     * @inheritdoc
+     * {@inheritdoc}
      */
-    public function getAliases()
+    public function getAliases(): array
     {
         return [];
     }