import { ExecutionMetrics } from '@grunnverk/tree-execution';
/**
 * PerformanceTracker collects and analyzes performance metrics
 */
export declare class PerformanceTracker {
    private startTime;
    private packageStartTimes;
    private packageEndTimes;
    private concurrencyHistory;
    constructor();
    /**
     * Record package start
     */
    recordPackageStart(packageName: string): void;
    /**
     * Record package end
     */
    recordPackageEnd(packageName: string): void;
    /**
     * Record concurrency level
     */
    recordConcurrency(level: number): void;
    /**
     * Calculate comprehensive metrics
     */
    calculateMetrics(_maxConcurrency: number): ExecutionMetrics;
    /**
     * Get package durations
     */
    private getPackageDurations;
    /**
     * Get efficiency metrics
     */
    getEfficiency(maxConcurrency: number): {
        utilization: number;
        efficiency: number;
        parallelEfficiency: number;
    };
    /**
     * Generate performance report
     */
    generateReport(maxConcurrency: number): string;
    private formatDuration;
}
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