require.js listener or callback - requirejs

Question

I am loading a 3rd party script that simply creates an overlay on a site it has been loaded onto. It works fine but sites using require.js seem to have intermittent issues I'm assuming with async loading some js files. Is there any type of callback or way to create a module in the DOM as sort of a listener to see if require.js is done loading?
I tried this but not even close:
define(function() {
alert('test');
return {};
});
and
define('myModule',
function () {
var myModule = {
doStuff:function(){
console.log('Yay! Stuff');
}
};
return myModule;
});
console.log(myModule);

Answer 1

I ended up just creating a secondary require.config file and loading the module with require if require is detected, seems to work fine.
if(typeof require === 'function') {
var base = 'http://' + someDomainVar;
function getJSTreeURL() {
var url = base + '/js/libs/jstree.min';
return url;
}
function getModuleURL() {
var url = base + '/module';
return url;
}
var reqTwo = require.config({
context: "instance2",
baseUrl: "instance2",
paths: {
'jq': 'http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min',
'jqTree': getJSTreeURL(),
'module': getModuleURL()
},
shim: {
'jq': {
exports: 'jq'
},
'jqTree': {
deps: ['jq'],
exports: 'jqTree'
},
'module': {
deps: ['jq', 'jqTree'],
exports: 'module'
}
}
});
reqTwo(['require', 'jq', 'jqTree'],
function(require, jq, jqTree) {
setTimeout(function() {
require(['module'],
function(module) {
console.log('loaded');
}
);
}, 0);
});