/**
 * Shared lexical-search fallback for stores without native full-text search
 * (JsonCortexStore, FirestoreCortexStore). SqliteCortexStore uses FTS5/BM25
 * instead. Scoring is simple weighted token overlap — good enough to surface
 * exact-keyword matches that embedding search misses.
 */
import type { Memory, SearchResult } from '../core/types.js';
/** Lowercase alphanumeric tokens, 2+ chars. */
export declare function tokenize(text: string): string[];
/**
 * Rank `memories` by lexical overlap with `text`. Skips faded memories and
 * zero-score candidates. Returns at most `limit` results, best first.
 */
export declare function lexicalSearch(memories: Memory[], text: string, limit: number): SearchResult[];
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