/**
 * @typedef {object} CachedOptions
 * @property {number} [ttl=Infinity] Milliseconds a Cache-API entry is
 *   considered fresh. After expiry the next call re-fetches. Default
 *   is `Infinity`
 * @property {string} [cacheName='pota-cache-v1'] The Cache API bucket
 *   to read/write. Default is `'pota-cache-v1'`
 * @property {(r: Response) => unknown} [parse] Default is `r =>
 *   r.json()`. Applied to the cached or freshly-fetched `Response` to
 *   produce the resolved value.
 */
/**
 * Cached `fetch`. Three layers: concurrent in-flight dedup, Cache API
 * persistence with per-entry TTL, then network fetch. Cache entries
 * are stamped with `x-cached-at` so TTL works without a sidecar
 * index. Successful results are removed from the in-flight map so
 * later calls (past TTL) can refresh; failed fetches are removed too
 * so they can be retried.
 *
 * @template T
 * @param {string} url
 * @param {CachedOptions} [opts]
 * @returns {Promise<T>}
 * @url https://pota.quack.uy/use/cached
 */
export function cached<T>(url: string, opts?: CachedOptions): Promise<T>;
export type CachedOptions = {
    /**
     * Milliseconds a Cache-API entry is
     * considered fresh. After expiry the next call re-fetches. Default
     * is `Infinity`
     */
    ttl?: number;
    /**
     * The Cache API bucket
     * to read/write. Default is `'pota-cache-v1'`
     */
    cacheName?: string;
    /**
     * Default is `r =>
     * r.json()`. Applied to the cached or freshly-fetched `Response` to
     * produce the resolved value.
     */
    parse?: (r: Response) => unknown;
};
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