/**
 * Makes a request using `fetch` and stores the result in internal memory cache.
 * The cache is cleared when the page is unloaded.
 * @param url The URL to request
 * @param requestOptions Request options
 * @param force If true, reload from source and update the cache, even if it has
 * already been cached.
 */
export declare function getAndCache(url: string, requestOptions?: RequestInit, force?: boolean): Promise<any>;