non-commonjs.require.js

function Global(){}
var G = Global.prototype = window || globalScope;
var global = new Global();
function require(id) {
    var preGlobals = Object.keys(global);
    var exports = modules[id];
    factories[id].call(G, exports, require, metadata[id], global);
    var Globals = Object.keys(global).forEach(function(key) {
        if (0 > preGlobals.indexOf(key)) { // global introduced by module
            if (!global.hasOwnProperty(key)) { 
                // was not introduced by commonjs module
                // cause in that case it would've be global.foo = "bar";
                exports[key] = G[key];  // exporting
                G[key] = undefined;     // removing from global
            }
        }
    })
    return exports;
}