Definitely source maps. They should basically let stuff compiled to JS be as easy to debug as stuff compiled to x86. But JavaScript actually has some advantage

Definitely source maps. They should basically let stuff compiled to JS be as easy to debug as stuff compiled to x86. But JavaScript actually has some advantages for debugging. The generated code is much more readable than x86 or ARM, and it's trivial to instrument code while debugging, http://mozakai.blogspot.com/2012/06/debugging-javascript-is-awesome.html http://mozakai.blogspot.com/2012/06/debugging-javascript-is-...