import type { ConvergenceConfig, ConvergenceResult, EvalRunRecord, RegressionResult } from './types.ts';
export declare const DEFAULT_CONVERGENCE: ConvergenceConfig;
export declare const DEFAULT_REGRESSION_THRESHOLD = 0.1;
/** Population variance of a number series; 0 for fewer than 2 values. */
export declare function computeVariance(values: number[]): number;
/**
 * Converged when the variance of pass rates across the most recent
 * `windowSize` runs sits below `threshold` and at least `minRuns` are present.
 */
export declare function detectConvergence(history: EvalRunRecord[], config?: ConvergenceConfig): ConvergenceResult;
/**
 * Regression when the latest run's pass rate dropped more than `threshold`
 * below the best-seen pass rate in history.
 */
export declare function detectRegression(history: EvalRunRecord[], threshold?: number): RegressionResult;
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