/**
 * Request de-duplication for configuration reads (api catalog metadata,
 * promoted methods, ...). Config data changes rarely, so the same URL should be
 * fetched at most once per session and shared by every consumer.
 *
 * axios-hooks already keeps a module level LRU of *completed* responses, but it
 * has no in-flight de-duplication: N components mounting at the same time with
 * the same request config all miss the cache and all issue a request. The
 * wrapper installed here closes that gap without changing behaviour for
 * anything that does not opt in.
 */
/**
 * Marker added to an axios config by `useAxiosGet` when the call site opted in
 * to caching. Only flagged requests are de-duplicated.
 */
export declare const DEDUPE_CONFIG_FLAG = "udpDedupeConfigRequest";
/**
 * Installs the de-duplicating request function on axios-hooks. Idempotent, and
 * a pass-through for every request that is not flagged for de-duplication.
 */
export declare const enableConfigRequestDedupe: () => void;
/**
 * Session cache + in-flight guard for config reads that do not go through
 * axios-hooks (POST based catalog lookups, for instance).
 * @template T
 * @param {string} key - Stable identity of the read (url or id tuple).
 * @param {() => Promise<T>} request - Issues the request on a cache miss.
 * @returns {Promise<T>}
 */
export declare const fetchConfigOnce: <T>(key: string, request: () => Promise<T>) => Promise<T>;
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