/**
 * Regression Suite Manager — Track test results over time.
 * Detect regressions automatically between labeled runs.
 */
import type { SuiteResult } from './types';
export interface RegressionSnapshot {
    label: string;
    saved_at: string;
    suite_name: string;
    suite_path: string;
    summary: {
        total: number;
        passed: number;
        failed: number;
        duration_ms: number;
    };
    tests: RegressionTestEntry[];
}
export interface RegressionTestEntry {
    name: string;
    passed: boolean;
    steps: number;
    duration_ms: number;
    cost_usd: number;
    tools_called: string[];
    tags?: string[];
}
export interface RegressionComparison {
    label_a: string;
    label_b: string;
    new_failures: string[];
    new_passes: string[];
    step_regressions: Array<{
        test: string;
        before: number;
        after: number;
    }>;
    cost_regressions: Array<{
        test: string;
        before: number;
        after: number;
    }>;
    duration_regressions: Array<{
        test: string;
        before: number;
        after: number;
    }>;
    summary: {
        total_regressions: number;
        total_improvements: number;
    };
}
/**
 * Add a regression snapshot from suite results.
 */
export declare function addRegressionSnapshot(result: SuiteResult, label: string, suitePath: string, baseDir?: string): string;
/**
 * Load a regression snapshot by label.
 */
export declare function loadRegressionSnapshot(label: string, baseDir?: string): RegressionSnapshot | null;
/**
 * List all regression snapshots.
 */
export declare function listRegressionSnapshots(baseDir?: string): RegressionSnapshot[];
/**
 * Compare two labeled snapshots and detect regressions.
 */
export declare function compareRegressionSnapshots(labelA: string, labelB: string, baseDir?: string): RegressionComparison | null;
/**
 * Format comparison for CLI display.
 */
export declare function formatRegressionComparison(cmp: RegressionComparison): string;
/**
 * Format list of snapshots for CLI.
 */
export declare function formatSnapshotList(snapshots: RegressionSnapshot[]): string;
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