/**
 * Performance measurement and memory management utilities
 * Part of Sub-phase 3.3.1-3.3.2 optimization efforts
 */
import type { PerformanceMetrics } from "../types/index.js";
/**
 * Performance measurement utility for tracking operations
 */
export declare class PerformanceTracker {
    private metrics;
    /**
     * Start tracking performance for an operation
     */
    start(operationName: string): void;
    /**
     * End tracking and calculate metrics
     */
    end(operationName: string): PerformanceMetrics | null;
    /**
     * Get metrics for an operation
     */
    getMetrics(operationName: string): PerformanceMetrics | null;
    /**
     * Clear all metrics
     */
    clear(): void;
    /**
     * Format metrics for display
     */
    formatMetrics(operationName: string): string;
}
/**
 * Global performance tracker instance
 */
export declare const globalTracker: PerformanceTracker;
/**
 * Memory management utilities
 */
export declare class MemoryManager {
    /**
     * Force garbage collection if available
     */
    static forceGC(): boolean;
    /**
     * Get current memory usage in MB
     */
    static getMemoryUsageMB(): {
        rss: number;
        heapTotal: number;
        heapUsed: number;
        external: number;
    };
    /**
     * Monitor memory usage and warn if it exceeds threshold
     */
    static monitorMemory(threshold?: number): boolean;
    /**
     * Clean up and optimize memory usage.
     * Attempts to force garbage collection if available.
     *
     * @returns {object|null} Memory usage statistics if cleanup was performed, or null if not possible.
     *   - If manual garbage collection is not available (i.e., Node.js not run with --expose-gc),
     *     no cleanup is performed and null is returned.
     *   - Clearing the require cache is not attempted due to potential side effects.
     */
    static cleanup(): {
        beforeMB: number;
        afterMB: number;
        freedMB: number;
    } | null;
}
/**
 * Decorator for tracking performance of async functions
 */
export declare function trackPerformance(operationName: string): <T extends (...args: unknown[]) => Promise<unknown>>(_target: unknown, _propertyName: string, descriptor: TypedPropertyDescriptor<T>) => TypedPropertyDescriptor<T>;
/**
 * Performance monitoring for CLI operations
 */
export declare class CLIPerformanceMonitor {
    private static instance;
    private enabled;
    static getInstance(): CLIPerformanceMonitor;
    enable(): void;
    disable(): void;
    /**
     * Monitor a CLI operation
     */
    monitorOperation<T>(operationName: string, operation: () => Promise<T>): Promise<T>;
}
/**
 * Export singleton monitor for easy access
 */
export declare const cliMonitor: CLIPerformanceMonitor;