import { Tool } from '../../tool.js';
import { BaseSearchTransform } from './base-search.transform.js';
import { BM25Engine, BM25EngineOptions } from './bm25.engine.js';
import { SearchTransformOptions } from './types.js';
export interface BM25SearchTransformOptions extends SearchTransformOptions, BM25EngineOptions {
}
export declare class BM25SearchTransform extends BaseSearchTransform {
    readonly name = "BM25SearchTransform";
    private readonly engine;
    constructor(options?: BM25SearchTransformOptions);
    protected updateIndex(tools: Tool[], hash: string): void;
    protected search(query: string, limit: number): Promise<Tool[]>;
    /**
     * Diagnostic statistics for debugging, telemetry, and test verification.
     */
    getEngineStats(): {
        docCount: number;
        avgDocLength: number;
        vocabSize: number;
        contentHash: string;
    };
    /**
     * Diagnostic access to underlying BM25 engine.
     */
    getEngine(): BM25Engine<Tool>;
}
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