Ajax Girl

Dean Edwards has released Packer v3.0, one of the top utilities to squeeze your JavaScript like a lemon.

• 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:

but then Sil came up with:

Source: Ajaxian
Original Article: http://ajaxian.com/archives/packer-30-and-ismsie-hacks