jQuery Blog » jQuery 1.9 RC1 and Migrate RC1 Released: "NEW! SOURCE MAPS
jQuery 1.9RC1 has added the ability to use source maps in browsers that support them. At the moment that’s just Google Chrome, but Mozilla Firefox is planning support as well.
What’s all this about? Well imagine that you are using compressed versions of your files on your production site, including a compressed version of jQuery. You get a report that an important customer is running into a problem. You could debug it a lot easier if you had the uncompressed source, but using that on your high-traffic production site isn’t an option. With source maps, you can let the browser’s debugger “map” the lines in the compressed file into the uncompressed source. That makes it so much easier to set breakpoints, inspect or change values, and see meaningful variable names. This video gives you a taste of what it can do."
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