import { BaseError } from 'make-error';
/**
 * Thrown by a FetchRequestFactory if one of the async request initialization steps fails.
 */
export declare class FetchRequestFactoryError extends BaseError {
    readonly error: Error | string | unknown;
    constructor(error: Error | string | unknown);
}
/**
 * Wraps the input fetch function to always pass the fetch response promise to requireOkResponse().
 *
 * @param inputFetch
 * @returns
 */
export declare function fetchOk(inputFetch: typeof fetch): typeof fetch;
export declare class FetchResponseError extends BaseError {
    readonly response: Response;
    constructor(response: Response);
}
/**
 * Asserts that the fetch response has an ok status code, throwing a FetchResponseError if it does not.
 *
 * @param responsePromise - promise resolving to the fetch Response to validate
 * @returns a promise resolving to the Response if the status is ok
 */
export declare function requireOkResponse(responsePromise: Promise<Response>): Promise<Response>;