Require.js "Watch" Implementation

requirejs.reload.js

var reload = (function () {

	'use strict';

	var cache = {};
	var refresh = {};
	var execCb = window.requirejs.s.contexts._.execCb;

	window.requirejs.s.contexts._.execCb = function (name, callback) {

		if (cache[name]) {

			var _callback = callback + '';

			refresh[name] = (cache[name] !== _callback);

			cache[name] = _callback;
		}

		return execCb.apply(this, arguments);
	};

	return function reload (paths, callback, interval) {

		// Start watching
		paths.forEach(function (path) {
			cache[path] = true;
		});

		setInterval(function () {

			require(paths, function () {

				var reload;

				paths.forEach(function (path) {

					requirejs.undef(path);

					reload = refresh[path];

					refresh[path] = false;
				});

				if (reload) {
					console.info('Reloading', paths);
					callback.apply(this, arguments);
				}
			});
		}, interval || 2000);
	};
})();