/**
 * URL canonicalization (DESIGN D4, ADR-0004 §5).
 *
 * Pure, identity-only normalization used solely as the Map key for
 * cross-arm (and cross-sub-query) result dedupe in search merge. The
 * emitted `url` on every result is the first writer's original string;
 * `canonicalUrl` exists to identify "same URL across providers" — not
 * to present a prettier URL to the user.
 *
 * Rules (DESIGN D4):
 *   - lowercase scheme + host (the WHATWG URL parser handles both)
 *   - strip default ports: `:443` for https, `:80` for http (also
 *     already done by the WHATWG parser — `parsed.host` never carries
 *     a scheme-default port)
 *   - strip the URL fragment
 *   - strip a trailing `/` from the path (the root `/` is preserved)
 *   - remove `utm_*` and `fbclid` query parameters — each parameter
 *     NAME is percent-decoded before the match (`?%66bclid=x`
 *     collapses with `?fbclid=x`), while the surviving raw pairs keep
 *     their exact bytes and order
 *   - relative or malformed inputs pass through verbatim — identity
 *     must never throw, so the Map key for an unparseable string is
 *     the string itself
 *
 * Everything NOT in that list is preserved verbatim: the raw path is
 * re-sliced from the input (WHATWG collapses dot segments —
 * `/a/../b` → `/b` — a normalization D4 does not authorize) and
 * userinfo is kept in the key (D4 authorizes dropping no authority
 * component, so `https://user@host/a` and `https://host/a` stay
 * distinct identities). The re-slice locates the authority under the
 * WHATWG parser's own boundary rules: special schemes accept any
 * slash/backslash separator run before the authority (and `\`
 * terminates it), so parser-equivalent spellings of one URL —
 * `https:///host/p`, `https:/\host/p`, `https:host/p` — collapse to a
 * single identity without duplicating host text or inventing userinfo.
 *
 * One widening beyond the parser (fusion plan D3, resolving the gate
 * formerly recorded here): the identity KEY collapses the direct www
 * alias of a two-label apex host — `www.example.com` keys as
 * `example.com`. The emitted `url` stays verbatim; only the Map key
 * changes. Deeper subdomains stay distinct by the two-label rule:
 * `www.blog.example.com`, `blog.example.com`, and `www.bbc.co.uk`
 * keep their own keys (deterministic, no public-suffix-list
 * dependency). Single-label remainders (`www.localhost`) do not
 * strip. Origin semantics for every other consumer of these URLs are
 * unchanged — this rule lives in `canonicalUrl` only.
 */
export declare function canonicalUrl(input: string): string;
//# sourceMappingURL=url.d.ts.map