import type { EvalMetricKey, EvalMetrics } from "./MetricTypes.js";
export interface EvalMetricDelta {
    key: EvalMetricKey;
    unit: "ratio" | "ms" | "tokens" | "usd";
    higher_is_better: boolean;
    baseline: number | null;
    current: number | null;
    delta: number | null;
    direction: "up" | "down" | "flat" | "unknown";
    regression: boolean;
    improved: boolean;
}
export interface EvalRegressionComparison {
    schema_version: 1;
    status: "baseline_missing" | "compared";
    baseline_report_id?: string;
    baseline_created_at?: string;
    deltas: EvalMetricDelta[];
    regression_count: number;
    improved_count: number;
    unchanged_count: number;
}
export declare const compareAgainstBaseline: (params: {
    current: EvalMetrics;
    baseline?: EvalMetrics;
    baseline_report_id?: string;
    baseline_created_at?: string;
}) => EvalRegressionComparison;
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