[qwer]

My biggest problem is definitely the source maps. It took me forever to get them to "work" and while the stack traces are mostly correct, they're often off by a line number or two. This makes debugging ridiculously hard when the line numbers are just "close".

I know this might not sound like a big deal in the grand scheme of things, but I also don't think CoffeeScript really improves on js all that much, so the annoyances of source maps are just not worth it to me personally.

[jashkenas]

Have you tried them at all recently? If a source map is off by a line, that's a bug that should be reported and fixed pronto.

[untog]

I'm surprised. I use Browserify (and Coffeeify), which spits out a source map inline at the end of the file, which has not once given me problems.

[serve_yay]

That sort of thing completely killed any interest I would have had in CS. When it came about I already knew JS really well and the benefits of CS just seemed too minimal for learning a new language and dealing with bugs like that.