import { QueryPerformance, OptimizationConfig, CacheStatistics, DatabaseStats } from './types.js';
export declare class QueryOptimizer {
    private config;
    private queryCache;
    private queryStats;
    private databaseStats;
    private indexUsageStats;
    constructor(config: OptimizationConfig['query']);
    optimizeQuery<T>(queryType: string, queryFn: () => Promise<T>, cacheKey?: string, indexHints?: string[]): Promise<{
        result: T;
        performance: QueryPerformance;
    }>;
    createOptimizedQuery(baseQuery: string, options?: {
        useIndex?: string[];
        limit?: number;
        orderBy?: string;
        where?: string;
    }): string;
    private restructureForIndexUsage;
    private optimizeWhereClause;
    generateCacheKey(queryType: string, params: any): string;
    invalidateCache(pattern?: string): void;
    private shouldCacheResult;
    private getResultCount;
    private calculateOptimizationLevel;
    private recordQueryPerformance;
    getQueryStats(queryType?: string): QueryPerformance[];
    getCacheStatistics(): CacheStatistics;
    getDatabaseStats(): DatabaseStats;
    getSlowQueries(thresholdMs?: number): QueryPerformance[];
    analyzeQueryPatterns(): {
        mostFrequent: Array<{
            queryType: string;
            count: number;
        }>;
        slowest: Array<{
            queryType: string;
            avgDuration: number;
        }>;
        cacheMissRates: Array<{
            queryType: string;
            missRate: number;
        }>;
    };
    optimizeIndexUsage(): string[];
    createQueryPlan(query: string): {
        estimatedCost: number;
        suggestedIndexes: string[];
        optimizations: string[];
    };
    exportPerformanceReport(): {
        summary: {
            totalQueries: number;
            averageQueryTime: number;
            cacheHitRate: number;
            slowQueriesCount: number;
        };
        topQueries: QueryPerformance[];
        cacheStats: CacheStatistics;
        recommendations: string[];
    };
    resetStats(): void;
}
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