alert.js

function alert(message, title, callback) {
    var dialog = Ti.UI.createAlertDialog({
        title: title  || 'Alert',
        message: message
    });
    
    if (callback) {
        dialog.addEventListener('click', callback);
    }
    
    dialog.show();
    
    return;
}

if (typeof exports !== 'undefined') {
        if (typeof module !== 'undefined' && module.exports) {
                exports = module.exports = alert;
        }
        exports.alert = alert;
}

ALERT.md

I guess just like me you like to do alert('My message'); instead of:

Ti.UI.createAlertDialog({
        message: 'My message'
}).show();

But I'd even more like to do alert('My message', 'My title', myCallback); instead of:

var dialog = Ti.UI.createAlertDialog({
        title: 'My title',
        message: 'My message'
});

dialog.addEventListener('click', myCallback);
dialog.show();

So, that's why I use the following drop-in replacement, which is fully compatible with Titanium's.

var alert = require('alert');
alert('Do you like?', 'I am replaced', function () { alert('Good!'); });