Ace can work with jshint, and that combo is great at spotting syntax errors, missing variable declarations (my students are always getting the case of their variables wrong and dyslexic students in my classes rely on it), and showing syntax errors etc.
You would want to have it on a config on the project, because unless you use /* global ??? / it can be unhelpful. (Unless of course you only run it if there is a / global */ line.
Thank you for this suggestion 
We opened a bug report and will keep this in our backlog!
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