/**
 * @fileoverview SimKey Derivation (SPEC Section 12.4)
 *
 * simKey is for similarity search using SimHash.
 * Tokens extracted from semantic-canonicalized IR.
 */
import type { IntentIR } from "../schema/index.js";
/**
 * Derive simKey for similarity search.
 *
 * Uses SimHash algorithm on tokens extracted from semantic-canonicalized IR.
 *
 * @example
 * const key = deriveSimKey(ir);
 * // Use for finding similar intents, clustering, recommendations
 */
export declare function deriveSimKey(ir: IntentIR): bigint;
/**
 * Compute Hamming distance between two SimHash values.
 *
 * Lower distance = more similar.
 */
export declare function simhashDistance(a: bigint, b: bigint): number;
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