Un petit script pour comparer le taille des sorties d'uglifyJS2. Dans le premier cas on donne des scripts déjà minifiés et dans l'autre des "versions de développements".

compare_minify.js

var UglifyJS = require("uglify-js");
var time = Date.now();

var compressed = UglifyJS.minify(["jquery-1.9.1.min.js", "raphael-min.js", "reqwest.min.js", "string.min.js", "humane.min.js", "underscore-min.js", "backbone-min.js", "angular.min.js", "three.min.js"])
compressedLength = compressed.code.length;

var uncompressed = UglifyJS.minify(["jquery-1.9.1.js", "raphael.js", "reqwest.js", "string.js", "humane.js", "underscore.js", "backbone.js", "angular.js", "three.js"]);
uncompressedLength = uncompressed.code.length;

var deltaTime = ((Date.now() - time) / 1000).toFixed(1);
console.log("Compressed:", compressedLength, "/ Uncompressed:", uncompressedLength, "| "+ (compressedLength / uncompressedLength).toFixed(3) +"%" ,"("+ deltaTime +"s)");