Simple UMD

simpleUMD.js

// resuable shortcut for module definition that works in Node (cjs) and the browser (Requirejs)
// (to save boilerplate may consider making umd function a global var - I know, I know!)
var umd = function (root, dependencies, factory) {
    var requiredDependencies = [];
    if (typeof define === 'function' && define.amd) {
        define(dependencies, factory);
    } else if (typeof exports === 'object') {
        for (var i = dependencies.length - 1; i >= 0; i--) {
            dependencies[i] = require(dependencies[i]);
        }
        module.exports = factory.apply(this, dependencies);
    }
}.bind(this, this);

// if umd is global then you only require this for module definition in node/browser
umd(['a', 'b'], function (a, b) {

});