Update GroupedProductTypeResolver.php

Author: Govind Sharma

app/code/Magento/GroupedProductGraphQl/Model/GroupedProductTypeResolver.php

@@ -8,7 +8,7 @@
 namespace Magento\GroupedProductGraphQl\Model;
 
 use Magento\Framework\GraphQl\Query\Resolver\TypeResolverInterface;
-
+use Magento\GroupedProduct\Model\Product\Type\Grouped as Type;
 /**
  * {@inheritdoc}
  */
@@ -19,7 +19,7 @@ class GroupedProductTypeResolver implements TypeResolverInterface
      */
     public function resolveType(array $data) : string
     {
-        if (isset($data['type_id']) && $data['type_id'] == 'grouped') {
+        if (isset($data['type_id']) && $data['type_id'] == Type::TYPE_CODE) {
             return 'GroupedProduct';
         }
         return '';