Dean Edwards has released Packer version 3.0, that allows and is one of the top utilities to squeeze your JavaScript.

• respects Microsoft conditional comments
• new option to shrink variable and argument identifiers
• removed the special chars feature (except the ;;; feature which people seem to like)
• some bug fixes:
  • packer no longer closes spaces between the +/- operators so code like this is safe: c = a++ +b;
  • the throw"error"} bug that affected Safari (this is a Safari bug really but packer gets around it)
  • the __proto__ bug for Mozilla browsers (this only affected the online version of packer)
  • a minor parsing bug affecting the detection of regular expressions
• simplified the user interface

Dean also had some fun sniffing browsers and came up with the short test.

Check out Packer version 3.

Source:→ Dean Edwards

Packer, Javascript