At the moment, the Parser class isn't exported at all (https://github.com/graphql/graphql-js/blob/master/src/language/parser.js#L165) which limits the ability to extend or use it as-is.

Is there a reason for that?

I would like to extend and add functionality to it, but it seems like it's not possible :(

@IvanGoncharov