/**
 * Chunk ID helpers.
 *
 * Vectorize caps IDs at 64 bytes, so every generator slugifies + truncates a
 * human-readable label. Truncation alone is collision-prone: two sections whose
 * headings share a prefix, or two long paths that match after the byte cut,
 * produce identical IDs and silently overwrite each other on upsert. We defend
 * against that by appending a short deterministic hash of the *fully distinct*
 * key so colliding slugs still resolve to unique IDs. The hash is stable across
 * runs, so re-indexing the same content keeps the same ID (upsert dedup intact).
 */
/** Deterministic short hex hash used to disambiguate truncated chunk IDs. */
export declare function chunkIdHash(distinctKey: string): string;
/**
 * Combine a readable slug with a hash of the fully-distinct key.
 *
 * @param readable - Human-readable slug (may exceed the budget; it gets cut)
 * @param distinctKey - The fully-qualified, collision-free key to hash
 * @returns ID of at most 64 bytes, unique whenever `distinctKey` differs
 */
export declare function finalizeChunkId(readable: string, distinctKey: string): string;
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