MC-29401: PHPStan: "Access to an undefined property" errors

Author: zakdma

app/code/Magento/CatalogImportExport/Model/Export/Product.php

@@ -115,6 +115,13 @@ class Product extends \Magento\ImportExport\Model\Export\Entity\AbstractEntity
      */
     protected $_productTypeModels = [];
 
+    /**
+     * Array of pairs store ID to its code.
+     *
+     * @var array
+     */
+    protected $_storeIdToCode = [];
+
     /**
      * Website ID-to-code.
      *