import { OnModuleInit, OnModuleDestroy } from '@nestjs/common';
export interface MemorySample {
    timestamp: number;
    heapUsed: number;
    heapTotal: number;
    rss: number;
    external: number;
    arrayBuffers: number;
    heapSizeLimit: number;
    detachedContexts: number;
}
export type MemoryTrend = 'stable' | 'growing' | 'likely_leak';
export interface MemoryReport {
    current: MemorySample;
    trend: MemoryTrend;
    leakScore: number;
    leakScoreBreakdown: {
        growthRate: number;
        detachedContexts: number;
        sustained: number;
    };
    windowSize: number;
    samples: MemorySample[];
    topMemoryRequests: RequestMemoryDelta[];
    gcAvailable: boolean;
    alerts: string[];
}
export interface RequestMemoryDelta {
    method: string;
    url: string;
    heapDeltaBytes: number;
    timestamp: number;
    durationMs: number;
}
export declare class MemoryService implements OnModuleInit, OnModuleDestroy {
    private readonly logger;
    private samples;
    private requestDeltas;
    private pollTimer;
    onModuleInit(): void;
    onModuleDestroy(): void;
    private takeSample;
    snapshotBefore(): number;
    recordDelta(method: string, url: string, heapBefore: number, durationMs: number): void;
    private computeTrend;
    getReport(): MemoryReport;
    forceGc(): {
        success: boolean;
        message: string;
        heapFreedBytes?: number;
    };
    takeSnapshot(): {
        success: boolean;
        filePath?: string;
        message: string;
    };
    private buildCurrentSample;
}