/**
 * Shared helpers for fetching and merging signal ground truths.
 */
/**
 * Build a map of signal ID → expected outcome from a ground truths API response.
 */
export declare function buildGroundTruthMap(groundTruths: Array<{
    expectedOutcome: string;
    signalId: string;
}>): Map<string, string>;
/**
 * Enrich signal items with ground truth expected outcomes.
 * Mutates the signal objects in place.
 */
export declare function enrichSignalsWithGroundTruth(signals: Array<Record<string, unknown>>, groundTruthMap: Map<string, string>): void;