import * as jsdom from 'jsdom'; var kickstart = () => { let g: any = global; let document = jsdom.jsdom(''); g.document = document; g.window = (document).defaultView; g.navigator = { userAgent: 'testing' }; }; var cleanup = () => { let g: any = global; delete g.document; delete g.window; delete g.navigator; }; // Initial kickstart is neede because of required modules // (FileSaver, I'm looking at you) kickstart(); beforeEach(kickstart); afterEach(cleanup);