dojo async plugin

async.js

/*global dojoConfig */
define(function() {
    var cb = '_asyncApiLoaderCallback';
    return {
        load: function(param, req, loadCallback) {
            if (!cb) {
                return;
            } else {
                dojoConfig[cb] = function() {
                    delete dojoConfig[cb];
                    cb = null;
                    loadCallback();
                };
                require([param + '&callback=dojoConfig.' + cb]);
            }
        }
    };
});

usage example

/*global google */
define([
    'plugins/async!//maps.google.com/maps/api/js?v=3&sensor=false'
], function(....