/**
 * `fetch` with retry + timeout.
 *
 * - 2 retries on 408 / 429 / 5xx (transient upstream errors)
 * - Default 15 second total per-attempt timeout via AbortController
 * - Network errors (DNS, refused, abort) count as retryable
 *
 * Returns `undefined` on terminal failure. Callers treat undefined the same
 * as a 404 (the package's types just couldn't be loaded).
 */
export interface FetchWithRetryOptions {
    retries?: number;
    timeoutMs?: number;
    init?: RequestInit;
}
export declare function fetchWithRetry(url: string, { retries, timeoutMs, init }?: FetchWithRetryOptions): Promise<Response | undefined>;
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