export interface ReportDelta {
    summary: {
        old: {
            passed: number;
            failed: number;
            total: number;
        };
        new: {
            passed: number;
            failed: number;
            total: number;
        };
        diff_passed: number;
        diff_failed: number;
    };
    new_failures: string[];
    fixed: string[];
    still_failing: string[];
    new_tests: string[];
    removed_tests: string[];
    duration_change_ms: number;
}
/**
 * Compare two report files (SuiteResult JSON or HTML with embedded data).
 */
export declare function compareReports(oldPath: string, newPath: string): ReportDelta;
/**
 * Format report comparison for console output.
 */
export declare function formatReportDelta(delta: ReportDelta): string;
/**
 * Generate an HTML delta report.
 */
export declare function generateDeltaHTML(delta: ReportDelta): string;
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