/**
 * Detects client-side redirect stubs — HTTP-200 pages that redirect via
 * <meta http-equiv="refresh"> (+ <base href>) or a top-of-document JS
 * location assignment — so the freshness fetcher never hashes a contentless
 * stub as authoritative source content.
 * See docs/superpowers/specs/2026-06-19-owasp-freshness-fix-design.md.
 */
/** Thrown by the fetcher when a source is a client-side redirect stub that
 *  cannot be safely followed. The CLI converts this into a fail-closed skip. */
export declare class SourceUnusableError extends Error {
    readonly url: string;
    readonly detail: string;
    constructor(url: string, detail: string);
}
export type RedirectClassification = {
    kind: 'accept';
} | {
    kind: 'follow';
    target: string;
} | {
    kind: 'unusable';
    detail: string;
};
export declare function classifyRedirect(body: string, contentType: string | null, finalUrl: string): RedirectClassification;
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