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Esprima version .

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Source Size (KiB) Esprima Narcissus parse-js ZeParser
jQuery 1.7.1
Prototype 1.7.0.0
MooTools 1.4.1
Total

Narcissus is from github.com/mozilla/narcissus revision b5caa7df (dated Oct 26 2011).
parse-js is from github.com/mishoo/UglifyJS revision e751e369 (dated Nov 21 2011).
ZeParser is from github.com/qfox/ZeParser revision 43c2d2ed (dated Nov 23 2011).