import type { TraceSummary, Severity } from '../../shared/types/index.js';
export type ChangeDirection = 'regression' | 'improvement' | 'unchanged';
export interface MetricComparison {
    name: string;
    baseValue: number;
    headValue: number;
    absoluteChange: number;
    percentageChange: number;
    direction: ChangeDirection;
    severity: Severity;
    unit: string;
}
export interface LayoutThrashComparison {
    selector: string;
    baseReflowCostMs: number;
    headReflowCostMs: number;
    direction: ChangeDirection;
    percentageChange: number;
}
export interface GPUStallComparison {
    element: string;
    baseStallMs: number;
    headStallMs: number;
    direction: ChangeDirection;
    percentageChange: number;
}
export interface LongTaskComparison {
    function: string;
    file: string;
    baseCpuMs: number;
    headCpuMs: number;
    direction: ChangeDirection;
    percentageChange: number;
}
export interface HotspotComparisons {
    layoutThrashing: LayoutThrashComparison[];
    gpuStalls: GPUStallComparison[];
    longTasks: LongTaskComparison[];
}
export interface ComparisonResult {
    id: string;
    baseSummary: TraceSummary;
    headSummary: TraceSummary;
    frameMetrics: MetricComparison[];
    phaseBreakdown: MetricComparison[];
    hotspots: HotspotComparisons;
    regressions: MetricComparison[];
    improvements: MetricComparison[];
    changeImpactScore: number;
    maxRegressionSeverity: Severity | null;
    timestamp: string;
}
export interface CompareOptions {
    significanceThreshold?: number;
    severityThresholds?: SeverityThresholds;
}
export interface SeverityThresholds {
    info: number;
    warning: number;
    high: number;
    critical: number;
}
export interface ICompareService {
    compare(baseSummary: TraceSummary, headSummary: TraceSummary, options?: CompareOptions): ComparisonResult;
    calculateChangeImpactScore(regressions: MetricComparison[], improvements: MetricComparison[]): number;
    determineSeverity(percentageChange: number, thresholds?: SeverityThresholds): Severity;
}