import { RequestContext } from '@vendure/core';
import { BetterSearchInput, BetterSearchResultList } from '../api/generated/graphql';
import { BetterSearchConfig } from '../types';
import { IndexService } from './index.service';
export declare class SearchService {
    private indexService;
    private options;
    /**
     * In memory cache of created indices
     */
    private cachedIndices;
    private indexTtl;
    constructor(indexService: IndexService, options: BetterSearchConfig);
    search(ctx: RequestContext, input: BetterSearchInput): Promise<BetterSearchResultList>;
    /**
     * Get index from cache or from DB.
     * Uses Stale-while-revalidate pattern: uses an outdated index if it exists,
     * but fetches a new one from DB in the background.
     */
    private getIndex;
}