import {provide} from 'angular2/core'; import {bootstrap} from 'angular2/platform/browser'; import {UrlResolver} from 'angular2/compiler'; var MyApp: any; // #docregion url_resolver class MyUrlResolver extends UrlResolver { resolve(baseUrl: string, url: string): string { // Serve CSS files from a special CDN. if (url.substr(-4) === '.css') { return super.resolve('http://cdn.myapp.com/css/', url); } return super.resolve(baseUrl, url); } } bootstrap(MyApp, [provide(UrlResolver, {useClass: MyUrlResolver})]); // #enddocregion