@heelc29 Confirmed. We had to remove the Airbnb style because it is not updated anymore since long time. See also Dimitris' comment here: richard67#48 (comment) .

@dgrammatiko Maybe you can check again if there is a suitable replacement which works with eslint 9?

I have the feeling that it doesn't check anything anymore. No matter what I tried to change, no error ever appeared.
I even tried deleting this block in the config, hoping that an error would appear.

@heelc29 I would assume it still can check for syntax errors, what a classical linter should do. Your example seems not to be a syntax error. Could you check some? Not that I would say it is fine, we still should do something to get back style linting. But if it also fails for syntax errors then we have a real problem.

That's right, syntax errors are still detected.