A simple require function that: takes an array of urls, fetches the code using the Fetch API, then evals them using a wrapper that exposes module.exports to the code.

require.js

function require (urls, cb) {
	if (!Array.isArray(urls) && typeof urls === 'string') urls = [urls];
	var modules = [];
	var i = 0, next = function () {
		fetch(urls[i])
			.then(function (response) {
				return response.text();
			})
			.then(function (code) {
				try {
					var module = eval('(function () { var module = { exports: {} }; (function() { ' + code + ' })(); return module.exports; })();');
					modules.push(module);
					if (++i == urls.length) {
						cb.apply(this, modules);
					}
					else {
						next();
					}
				}
				catch (e) {
					console.error(e);
				}
			})
			.catch(function (ex) {
				console.error(ex);
			});
	};
	next();
}