Run uglify-js on all the javascript files in a folder

minify-all.js

// NOTE: run with `NODE_ENV=production` for optimal results

const fs = require('fs');
const path = require('path');
const UglifyJS = require('uglify-js');

// Path to process
const bin = './bin';

function onlyJS(files) {
	return files.filter(function(file) {
		return path.extname(file) == '.js';
	}).map(function(file) {
		return path.join(bin, file);
	});
}

function minify(file) {
	console.log('Minify ' + file);

	const result = UglifyJS.minify(file, {
		mangle:true,
		compress: {
			dead_code: true
		}
	});

	if (result && result.code) {
		fs.writeFile(file, result.code);
	}
}

fs.readdir(bin, function(err, files) {
	onlyJS(files).forEach(minify)
});