/**
 * Heuristic hallucination / grounding check — compares answer tokens to context.
 * For production, combine with LLM-as-judge or @hazeljs/eval.
 */
export interface HallucinationCheckResult {
    grounded: boolean;
    overlapRatio: number;
    suspiciousPhrases: string[];
}
/**
 * Returns true when answer appears supported by context (token overlap + hedge detection).
 */
export declare function checkHallucinationHeuristic(answer: string, context: string): HallucinationCheckResult;
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