build.js

/**
 * Compile JS files using Closure-Compiler service
 */

/*jshint node: true*/

var fs   = require('fs');
var path = require('path');
var gccs = require('gccs');

var dir = __dirname;
// var dir = path.join(__dirname, '..'); // uncomment this if you move build.js to /tools folder
var dist = path.join(dir, 'dist');
var packo = require(path.join(dir, 'package.json'));
// var version = packo.version;
var hashes = [path.basename(packo.main, '.js')];

if ( !fs.existsSync(dist) ) {
    fs.mkdir(dist);
}

hashes.forEach(function (name) {
    var filename = path.join(dir, name + '.js');

    var dest_filename         = path.join(dist, name + '.js');
    var dest_min_filename     = path.join(dist, name + '.min.js');

    gcc(filename, dest_filename, { compilation_level: 'WHITESPACE_ONLY', formatting: 'pretty_print' });
    gcc(filename, dest_min_filename);
});

function gcc(src, dest, opt) {
    if ( !opt ) opt = {};
    opt.out_file = dest;
    gccs.file(src, opt, function (err) {
        if (err) {
            console.error(err);
            process.exit(1);
        }
        log_green(dest);
    });
}

// function cp(src, dest, cb) {
//     var s = fs.createReadStream(src).pipe(fs.createWriteStream(dest));
//     if ( cb ) {
//         s.on('finish', cb);
//     }
//     return s;
// }

function log_green(txt) {
    console.log("\x1b[32m%s\x1b[0m", txt);
}