/** Result returned from cached request auth. */
export type CachedRequestAuthResult<TAuth> = TAuth | Response;
/** Options accepted by create request auth cache. */
export interface CreateRequestAuthCacheOptions<TAuth> {
    authenticate: (request: Request) => Promise<CachedRequestAuthResult<TAuth>> | CachedRequestAuthResult<TAuth>;
    shouldCache?: (result: CachedRequestAuthResult<TAuth>) => boolean;
}
/** Public API contract for request auth cache. */
export interface RequestAuthCache<TAuth> {
    authenticate: (request: Request) => Promise<CachedRequestAuthResult<TAuth>>;
}
/** Create request auth cache. */
export declare function createRequestAuthCache<TAuth>(options: CreateRequestAuthCacheOptions<TAuth>): RequestAuthCache<TAuth>;
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