/**
 * Dead link detector — tracks broken links discovered during crawl.
 *
 * A "dead link" is a URL that:
 * - Returns 404, 410, or other 4xx/5xx responses
 * - Times out after maxRetries
 * - Redirects to an error page (detected by title heuristic)
 *
 * Results: list of broken links with source page, status code, and anchor text.
 * Used for: SEO audit export, test report enrichment.
 */
export interface DeadLink {
    url: string;
    statusCode: number;
    sourceUrl?: string;
    anchorText?: string;
    checkedAt: string;
    reason: 'http-error' | 'timeout' | 'dns-error';
}
export declare class DeadLinkTracker {
    private deadLinks;
    private checked;
    record(url: string, statusCode: number, source?: {
        sourceUrl?: string;
        anchorText?: string;
    }): void;
    recordTimeout(url: string, sourceUrl?: string): void;
    getDeadLinks(): DeadLink[];
    isKnownBroken(url: string): boolean;
    stats(): {
        total: number;
        by404: number;
        by5xx: number;
        byTimeout: number;
    };
    toCsv(): string;
}