/**
 * Deep Pagination Service
 *
 * ARCHITECTURE: 2025-10-08
 * Implements Elasticsearch search_after for infinite scroll/pagination.
 * Deterministic sorting with createdAt + _id fallback ensures consistency.
 */
import { Client } from '@elastic/elasticsearch';
import { RequestContext } from '@vendure/core';
import { CursorSearchInput, CursorSearchResult } from './types';
export declare class DeepPaginationService {
    private client;
    private indexPrefix;
    constructor(client: Client, indexPrefix: string);
    /**
     * Execute cursor-based search using Elasticsearch search_after
     */
    cursorSearch(ctx: RequestContext, input: CursorSearchInput): Promise<CursorSearchResult<any>>;
    /**
     * Build Elasticsearch query from input
     */
    private buildQuery;
    /**
     * Build deterministic sort for search_after
     * CRITICAL: Must always include a unique tiebreaker
     *
     * ROOT CAUSE ANALYSIS: 2025-10-08
     * - Vendure variant index doesn't have createdAt field
     * - _id fielddata is disabled in ES 9.x (requires expensive fielddata)
     * - sku is TEXT field (not KEYWORD) - cannot sort without fielddata
     * - productVariantId is KEYWORD field and unique per variant ✅
     */
    private buildSort;
    /**
     * Encode search_after values as base64 cursor
     */
    private encodeCursor;
    /**
     * Decode base64 cursor to search_after values
     */
    private decodeCursor;
}
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