These tools already exist: JavaScript tools like minfiers or CoffeeScript can generate source maps which map code lines from one format to code lines in another

These tools already exist: JavaScript tools like minfiers or CoffeeScript can generate source maps which map code lines from one format to code lines in another format. http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/ http://www.html5rocks.com/en/tutorials/developertools/source...