GraphQL\Utils\TypeInfo::getFieldDef PHP Method

    function getFieldDef()
    {
        if (!empty($this->fieldDefStack)) {
            return $this->fieldDefStack[count($this->fieldDefStack) - 1];
        }
        return null;
    }

 /**
  * @return FieldDefinition
  */
 function getFieldDef()
 {
     return $this->_typeInfo->getFieldDef();
 }