/**
 * 性能监控工具
 */
export interface PerformanceMetrics {
    loadTime: number;
    cacheHitRate: number;
    errorRate: number;
    retryRate: number;
    offlineEvents: number;
}
export declare class PerformanceMonitor {
    private metrics;
    private operationCounts;
    /**
     * 记录加载时间
     */
    recordLoadTime(startTime: number, endTime: number): void;
    /**
     * 记录缓存命中
     */
    recordCacheHit(isHit: boolean): void;
    /**
     * 记录错误
     */
    recordError(): void;
    /**
     * 记录重试
     */
    recordRetry(): void;
    /**
     * 记录离线事件
     */
    recordOfflineEvent(): void;
    /**
     * 获取性能报告
     */
    getReport(): {
        metrics: PerformanceMetrics;
        recommendations: string[];
        grade: 'A' | 'B' | 'C' | 'D' | 'F';
    };
    /**
     * 重置指标
     */
    reset(): void;
}
export declare const performanceMonitor: PerformanceMonitor;
export declare const recordLoadTime: (startTime: number, endTime: number) => void;
export declare const recordCacheHit: (isHit: boolean) => void;
export declare const recordError: () => void;
export declare const recordRetry: () => void;
export declare const recordOfflineEvent: () => void;
export declare const getPerformanceReport: () => {
    metrics: PerformanceMetrics;
    recommendations: string[];
    grade: "A" | "B" | "C" | "D" | "F";
};
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