code: private function getAllFieldArgNodes($type, $fieldName, $argName)
      {
          $argNodes  = [];
          $fieldNode = $this->getFieldNode($type, $fieldName);
          if ($fieldNode && $fieldNode->arguments) {
              foreach ($fieldNode->arguments as $node) {
                  if ($node->name->value !== $argName) {
                      continue;
                  }
  
                  $argNodes[] = $node;
              }
          }
  
          return $argNodes;
      }
docs: @param ObjectType|InterfaceType $type
  @param string                   $fieldName
  @param string                   $argName
  
  @return InputValueDefinitionNode[]