Restart titanium build on file change

gistfile1.js

var chokidar = require('chokidar'),
  spawn = require('child_process').spawn,
	utils = require('util');

var watcher = chokidar.watch('./', {ignored: /^build/, persistent: true});
var lastUpdate = new Date().getTime();

function update(path){
	if(typeof path === 'object' || path.indexOf('Resources') !== -1 || path.indexOf('build') !== -1 || path.indexOf('monitor.js') !== -1){
		return;
	}

	var now = new Date().getTime();

	if(now-lastUpdate > 3000){
		lastUpdate = new Date().getTime();
		console.log('File is: ', path);

		var titanium = spawn('titanium', ['build','-p','ios']);

		titanium.stdout.on('data', function (data) {
			utils.log(data);
		});

		titanium.stderr.on('data', function (data) {
			utils.log(data);
		});

		titanium.on('close', function (code) {
			utils.log('TITANIUM KILLED, EXIT CODE: ' + code);
		});
 	}
}
watcher
  .on('add', update)
  .on('change', update)
  .on('unlink', update);