import fetch, { type RequestInit, type Response, type RequestInfo } from 'node-fetch';
/**
 * The name of the header generated by `generateIdempotencyHeader`.
 */
export declare const idempotencyHeaderName = "Idempotency-Key";
export type ResponseWithIdempotencyKey = Response & {
    idempotencyKey: string | undefined;
};
/**
 * Returns a wrapped version of fetch, making it attempt requests multiple times in some scenarios.
 *
 * The idea is that if the Mollie API has a brief hiccup, the extra attempts may cause the request to succeed anyway.
 *
 * If the Mollie API responds with a 5×× status code, the request will be re-attempted until:
 *  * the Mollie API responds with a different status code, or
 *  * the attempt limit has been reached (it gives up after the third attempt), or
 *  * the request has timed out.
 *
 * For `POST` and `DELETE` requests, an idempotency key is added. This ensures the Mollie API can distinguish a single
 * request being re-attempted from two separate similarly-looking requests. In effect, this allows this client to
 * safely re-attempt requests.
 */
export declare function retryingFetch(originalFetch: typeof fetch): (url: RequestInfo, init: RequestInit) => Promise<ResponseWithIdempotencyKey>;