import type { CacheEntry } from './cache-entry.ts';
import type { RegistryClientRequestOptions } from './index.ts';
export type RedirectStatus = 301 | 302 | 303 | 307 | 308;
export type RedirectResponse = CacheEntry & {
    statusCode: RedirectStatus;
    getHeader(key: 'location'): Uint8Array | undefined;
};
export declare const isRedirect: (response: CacheEntry) => response is RedirectResponse;
/**
 * If this response is allowed to follow the redirect (because max has not
 * been hit, and the new location has not been seen already), then return
 * the [url, options] to use for the subsequent request.
 *
 * Return [] if the response should be returned as-is.
 *
 * Throws an error if maxRedirections is hit or the redirections set already
 * contains the new location.
 *
 * Ensure that the response is in fact a redirection first, by calling
 * {@link isRedirect} on it.
 */
export declare const redirect: (options: RegistryClientRequestOptions, response: RedirectResponse, from: URL) => [] | [URL, RegistryClientRequestOptions];