window-getters 
Safe Window Getters
API
function getFromWindow<T>(name: string): T | undefined;
function getFromWindowOrThrow<T>(name: string): T;
function getDocumentOrThrow(): Document;
function getDocument(): Document | undefined;
function getNavigatorOrThrow(): Navigator;
function getNavigator(): Navigator | undefined;
function getLocationOrThrow(): Location;
function getLocation(): Location | undefined;
function getCryptoOrThrow(): Crypto;
function getCrypto(): Crypto | undefined;
function getLocalStorageOrThrow(): Storage;
function getLocalStorage(): Storage | undefined;