/**
 * Lexical + semantic retrieval, fused.
 *
 * Lexical search (names, stemmed summaries) is exact and fast but only finds
 * what shares words with the query. Embeddings find "which agent should handle
 * a task" -> `pickAgents` but blur exact identifiers. Reciprocal-rank fusion
 * keeps the strengths of both; the weights follow the query's style, and an
 * exact name match is always pinned first.
 *
 * Degrades to plain lexical search when no embedder is supplied, nothing has
 * been embedded yet, or the query only concerns documentation.
 */
import type Database from 'better-sqlite3';
import { type Embedder } from '../embeddings/store.js';
import { type GraphSearchOptions, type GraphSearchResult } from './hybrid-query.js';
export interface FusedSearchOptions extends GraphSearchOptions {
    embedder?: Embedder | null;
}
/** A single token (`UserService`, `agent-pick`, `fts-store.ts`) is a name, not a question. */
export declare function isIdentifierQuery(query: string): boolean;
export declare function searchGraphFused(db: Database.Database, query: string, options?: FusedSearchOptions): Promise<GraphSearchResult[]>;
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