/**
 * Reduce an anchor id (ours or GitHub's) to a comparable form.
 *
 * Everything but the final hyphen-run collapse is the shared heading-slug
 * chain: emoji strip → lowercase → drop non-word chars → spaces to hyphens →
 * trim edge hyphens. The collapse is this module's own addition, covering
 * GitHub's *interior* divergence — `## 💬 Community & Support` slugs to
 * `#-community--support` (a double hyphen around the dropped `&`) against our
 * `community-support`.
 *
 *   `'-getting-started'`     → `'getting-started'`
 *   `'-community--support'`  → `'community-support'`
 *   `'Getting Started'`      → `'getting-started'`
 */
export declare function normalizeAnchorId(raw: string): string;
/**
 * Resolve a `#hash` id that no exact lookup matched, by comparing normalized
 * forms. Returns `null` when nothing in the document matches, so the caller
 * can leave the browser's default behavior alone rather than hijacking a
 * click that was never ours to handle.
 *
 * Three passes, in order of how much they assume:
 *   1. a single `getElementById` on the normalized id — catches the whole
 *      emoji-hyphen family without walking the DOM;
 *   2. a heading scan — catches ids whose own raw form normalizes differently
 *      (e.g. `a---b`, from a title containing a literal ` - `);
 *   3. the duplicate-heading shift (see `findDuplicateShifted`) — last,
 *      because it is the only pass that resolves to an id the fragment did
 *      not name.
 */
export declare function findAnchorElementByNormalizedId(rawId: string, doc: Document): HTMLElement | null;
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