import type { TraceSummary, Severity } from '../shared/types/index.js';
import type { ICompareService, CompareOptions, ComparisonResult, MetricComparison, SeverityThresholds } from './interfaces/index.js';
export declare class CompareService implements ICompareService {
    compare(baseSummary: TraceSummary, headSummary: TraceSummary, options?: CompareOptions): ComparisonResult;
    private compareFrameMetrics;
    private comparePhaseBreakdown;
    private compareHotspots;
    private compareLayoutThrashing;
    private compareGPUStalls;
    private compareLongTasks;
    private createMetricComparison;
    private calculatePercentageChange;
    private determineDirection;
    determineSeverity(percentageChange: number, thresholds?: SeverityThresholds): Severity;
    calculateChangeImpactScore(regressions: MetricComparison[], improvements: MetricComparison[]): number;
    private getMaxSeverity;
    private generateComparisonId;
}