In Node.js we would like to add a rule that allows to verify that callbacks are properly in place. This would massively help to prevent using async APIs that do not add a callback.

The fs module is such a case where it is planned to throw in case no callback is provided. Users would get a much better experience if they could get notified with a eslint rule.

For fs that is possible by checking if the used function contains sync in it's name or not and if not, if the last argument is a callback or not. Other than that I would not know how to check this. There will be multiple cases that the rule could not catch but it is probably still helpful.

See also nodejs/node#18668.

Do you think that is feasible?