growl.js

var cp = require('child_process');

exports.notify = function(appName, message) {
    var g = cp.spawn('growlnotify', [
        '-n', appName,
        '-s',
        '-m', message,
        '-p', '2'
    ]);
    g.stdin.end();
    g.stdout.destroy();
    g.stderr.destroy();
};