import { CommonLogger } from '@goatlab/js-utils';
import type { NextFunction, Request, Response } from 'express';
interface MemoryMonitorOptions {
    logger?: CommonLogger;
    warningThreshold?: number;
    criticalThreshold?: number;
    monitorInterval?: number;
    enableGarbageCollection?: boolean;
    addHeaders?: boolean;
}
interface MemoryMetrics {
    heapUsedMB: number;
    heapTotalMB: number;
    heapUsedPercentage: number;
    rssMB: number;
    timestamp: number;
}
declare class MemoryMonitor {
    private logger;
    private warningThreshold;
    private criticalThreshold;
    private monitorInterval;
    private enableGarbageCollection;
    private addHeaders;
    private intervalTimer?;
    private lastMetrics?;
    private gcAvailable;
    private lastState;
    constructor(options?: MemoryMonitorOptions);
    private getMemoryMetrics;
    private formatMemoryMetrics;
    private checkMemoryUsage;
    startMonitoring(): void;
    stopMonitoring(): void;
    middleware(): (_req: Request, res: Response, next: NextFunction) => void;
    getLastMetrics(): MemoryMetrics | undefined;
}
export declare function createMemoryMonitorMiddleware(options?: MemoryMonitorOptions): {
    middleware: (req: Request, res: Response, next: NextFunction) => void;
    monitor: MemoryMonitor;
};
export declare function memoryMonitorMiddleware(options?: MemoryMonitorOptions): (req: Request, res: Response, next: NextFunction) => void;
export {};