/**
 * Client-side mirror of the backend's canonicalization rules
 * (content-credits-backend/src/utils/canonicalHost.ts + canonicalUrl.ts,
 * see POST_IDENTITY_AND_REVAMP_PLAN.md §2.2).
 *
 * The backend stays authoritative — it re-canonicalizes everything the SDK
 * sends. This helper exists so the beacon (`/posts/observe`) and the paywall
 * (`/credits/*`) agree on post identity *before* the request leaves the
 * browser, and so the SDK can dedupe/display consistently offline.
 *
 * Policy (kept identical to the backend on purpose — do not drift):
 *  - Fold `www.` -> apex, always. `www.example.com` === `example.com`.
 *  - Do NOT fold other subdomains. `blog.example.com` stays distinct.
 *  - Lowercase; strip protocol, port, path, query, fragment, trailing dot.
 *  - Accept a bare hostname or a full URL; resolve punycode/IDN via the URL API.
 *  - canonicalUrl: force https, drop fragment, drop tracking params
 *    (utm_*, fbclid, gclid, ref, mc_cid/mc_eid, igshid), sort remaining
 *    query params, normalize trailing slash.
 */
/** Mirrors backend `canonicalHost()` — fold www, lowercase, strip everything else. */
export declare function canonicalHost(input: string): string;
/** Mirrors backend `canonicalUrl()` — the dedup key, never used for display. */
export declare function canonicalUrl(input: string): string;