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I code in CoffeeScript a fair bit, and I don't find it's that bad even without source maps[0] because of the similarity between CS source and JS output. I can put in debugger statements and breakpoints just as I would in vanilla JS.

[0]: http://www.html5rocks.com/en/tutorials/developertools/source...

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this, the notion that CoffeeScript generated code resembles some kind of arcane binary like output is wrong. As knowing the basics of JavaScript is pretty much a requirement for working with CoffeScript I never ever encountered any problems when debugging generated code because is not obfuscated and easy to read and the compiler doesn't do anything you didn't specifically write in your CoffeeScript. I am going to go out on a limb here and say that I think compiled CoffeeScript is easier to read then most peoples hand written JS. What makes code unreadable is the Closure compiler which is completely different beast.

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