uglify-js-plugin/index.js

Uglify JavaScript for webpack

var UglifyJS = require("uglify-js"),
    colors = require("colors");
var debug = false;

function log(info) {
    debug && console.log(info.blue);
}

function UglifyJsPlugin(options) {
    this.options = options || {};
    this.options.compress = this.options.compress === undefined ? true : this.options.compress;
    this.options.fromString = true; //enable pass JavaScript source code, rather than file names.
}

UglifyJsPlugin.prototype.apply = function (compiler) {
    var options = this.options;
    debug = options.debug;
    compiler.plugin('emit', function (compilation, callback) {
        log('start UglifyJS:');
        compilation.chunks.forEach(function (chunk) {
            log('  UglifyJS chunk[' + chunk.name + ']: ' + chunk.files.join(' | '));
            options.compress && chunk.files.forEach(function (filename) {
                if (/\.js$/.test(filename)) {
                    var source = compilation.assets[filename].source();
                    var result = UglifyJS.minify(source, options);

                    compilation.assets[filename] = {
                        source: function () {
                            return result.code;
                        },
                        size: function () {
                            return result.code.length;
                        }
                    };
                }
            });
        });
        log('finish UglifyJS:');
        callback();
    });
};

module.exports = UglifyJsPlugin;