[goodells]

Mine won't do any auto-formatting when the syntax is invalid, so when I hit CMD + S and it _doesn't_ format it's a cue to start looking for errors.

[Waterluvian]

The only issue I have with this is that I wish it would chirp more loudly when there's a syntax error.

Every so often I don't notice red underline and I begin wondering why my autoformatter and autocomplete aren't working anymore.

Maybe a red border or something any time a file's syntax is invalid.

[trevyn]

I’m a big fan of Error Lens.