reove hardcoded value

Author: Dominic

app/code/Magento/ConfigurableProductGraphQl/Model/ConfigurableProductTypeResolver.php

@@ -8,6 +8,7 @@
 namespace Magento\ConfigurableProductGraphQl\Model;
 
 use Magento\Framework\GraphQl\Query\Resolver\TypeResolverInterface;
+use Magento\ConfigurableProduct\Model\Product\Type\Configurable as Type;
 
 /**
  * {@inheritdoc}
@@ -19,7 +20,7 @@ class ConfigurableProductTypeResolver implements TypeResolverInterface
      */
     public function resolveType(array $data) : string
     {
-        if (isset($data['type_id']) && $data['type_id'] == 'configurable') {
+        if (isset($data['type_id']) && $data['type_id'] == Type::TYPE_CODE) {
             return 'ConfigurableProduct';
         }
         return '';