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I'm not sure I would say that JS source maps are a hard problem to solve.

Fair point. However, it has taken years to get to where we are today (CoffeeScript just shipping support, limited browser support), so it doesn't seem to be an easy problem either.

The delay in CoffeeScript support had to do with the design of the compiler more than anything. CoffeeScriptRedux [1] has had this in for quite some time.

[1] https://github.com/michaelficarra/CoffeeScriptRedux/

Indeed the ecosystem and support around source maps isn't super easy in total, but I wouldn't call any particular point in isolation particularly difficult. It's just that there is quite a few of them.

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