Using ES6 Proxies to create a namespace root allowing automatically created child namespaces via a get trap

proxyNamespace.js

function ns(x) {
    return new Proxy(x, {
        get: function(target, name) {
            if(target.hasOwnProperty(name)) {
                return target[name];
            }
            return target[name] = ns({});
        }
    });
}

ns = ns(ns); // reuse the global function ns as a root namespace

// usage examples

ns.utils.extend = function () {}; // no need to define 'utils' first, it is automatically created
ns.dom.components.Graph = (function () { })(); // likewise, 'dom' and 'components' namespaces are automatically created
ns.should.I.not.be.using.amd.instead = 'probably'; // you get the idea