/**
 * Fetches the remote manifest.
 * Caches the request so the network is only hit once per session.
 * @returns {Promise<Object>} The remote manifest (keyed by remote name).
 */
export function getManifest(): Promise<any>;
/**
 * Invalidates the cached manifest and returns a fresh one.
 *
 * @param {Object} [options]
 * @param {boolean} [options.bust] When true and the CDN path is active, append
 *   a `?t=<timestamp>` query string to bypass any CloudFront edge cache.
 * @returns {Promise<Object>} A promise that resolves to the new manifest.
 */
export function refreshManifest({ bust }?: {
    bust?: boolean;
}): Promise<any>;
/**
 * Looks up `key` in the cached manifest; if missing, fetches the backend
 * manifest once and merges any entries that aren't already present (covers
 * MFEs still on the legacy non-CI deploy path that only Mongo knows about).
 *
 * Returns the (possibly updated) cached manifest. Concurrent calls share
 * a single in-flight backend fetch.
 *
 * @param {string} key
 * @returns {Promise<Object>}
 */
export function fillFromBackend(key: string): Promise<any>;