import type { TestResult, RuleInput } from '../types.js';
export type RedirectHop = {
    url: string;
    status: number;
};
export type RedirectChainResult = TestResult<{
    hops: RedirectHop[];
    finalUrl: string;
    chainLength: number;
}, {
    maxChainLength: number;
}>;
export type RedirectChainOptions = {
    /**
     * Maximum number of redirects allowed before flagging as an issue.
     * Default: 3. Google recommends keeping chains under 3–5 hops.
     */
    maxChainLength?: number;
    /** Request timeout in ms. Default: 10000. */
    timeout?: number;
    userAgent?: string;
};
/**
 * Follows redirect chains manually (fetch with redirect: 'manual') to detect:
 * 1. Chains longer than maxChainLength
 * 2. Redirect loops (cycles)
 * 3. HTTP→HTTPS redirects (informational)
 *
 * Pass: chain length ≤ maxChainLength and no loops
 * Warn: chain is long but within some tolerance; or HTTP→HTTPS redirect present
 * Fail: chain exceeds maxChainLength, or redirect loop detected
 */
export declare function checkRedirectChain(url: string, input: Pick<RuleInput, 'url' | 'context'>, options?: RedirectChainOptions): Promise<RedirectChainResult>;
declare function formatChain(hops: RedirectHop[]): string;
export { formatChain as formatChainForTest };
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