The script loader for Wikia that lets you use ES6 like an actual person

Zion.js

(function (window, document, mw) {
	var ZION = function () {
		this._scripts = [];
		this.loaded = this.loaded();
		
		return this;
	};

	ZION.prototype._getScriptURL = function (script) {
		var split = script.split(':');

		if (split.length === 0) return null;

		if (split.length >= 1) {
			if (split[0] === 'u') {
                split.shift();

				var server = split.shift(),
				    page   = split.join(':');
				return 'http://' + server + '.wikia.com/wiki/' + page + '?action=raw&ctype=text/javascript';
			} else {
				var page = (split.length > 1) ? split.join(':') : split[0];
				return mw.config.get('wgServer') + '/wiki/' + page + '?action=raw&ctype=text/javascript'; 
			}
		}
	};

	ZION.prototype._loadScript = function (script) {
		var node = document.createElement('script');
		var src  = this._getScriptURL(script);

		if (src === null) this.loaded.fire();

		node.setAttribute('src', src);
                node.setAttribute('async', 'true');
		document.body.appendChild(node);
	};

	ZION.prototype.load = function (scripts) {
		if (typeof scripts !== undefined) {
			if (Array.isArray(scripts)) {
				this._scripts = scripts;
			} else {
				this._scripts = [scripts];
			}
			
			this.loaded.fire();
		}
	};

	ZION.prototype.loaded = function () {
		return mw.hook('ZION.loaded').add(function () {
			if (this._scripts.length === 0) return;

			this._loadScript(this._scripts.shift());
		}.bind(this));
	};

	if (window.ZION !== undefined) return;

	window.ZION = new ZION();
}(window, document, mw));