export type HubShadowCompareConfig = {
    enabled: boolean;
    sampleRate: number;
    baselineMode: 'off' | 'observe' | 'enforce';
};
export declare function resolveHubShadowCompareConfig(): HubShadowCompareConfig;
export declare function shouldRunHubShadowCompare(config: HubShadowCompareConfig): boolean;
export declare function recordHubShadowCompareDiff(options: {
    requestId: string;
    entryEndpoint: string;
    routeHint?: string;
    candidateMode?: string;
    baselineMode: string;
    baselineOut: unknown;
    candidateOut: unknown;
    excludedProviderKeys?: string[];
    attempt?: number;
}): Promise<void>;