import type { EffectivenessSignalRecord } from "../../infrastructure/observability/local-metrics-store.js";
export interface ComparisonWindow {
    readonly beforeTimestamp: string;
    readonly afterTimestamp: string;
    readonly deltas: Readonly<Record<string, number>>;
}
export declare function computeEffectivenessComparison(signals: readonly EffectivenessSignalRecord[], beforeTimestamp: string, afterTimestamp: string): ComparisonWindow;
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