/**
 * Validate the stable list fields needed to preserve citation integrity while
 * retaining all other Google-owned metadata fields opaquely.
 */
export declare function readGoogleGroundingMetadata(value: unknown): Record<string, unknown>;
/**
 * Merge one streaming GroundingMetadata delta into the aggregate result.
 *
 * Google documents groundingChunks as incremental in streaming responses and
 * defines support indices across every response. Supports are therefore
 * appended too, while query strings are accumulated without duplicates.
 * Scalar/object fields and unknown future fields use the latest value.
 */
export declare function mergeGoogleGroundingMetadata(current: Record<string, unknown> | undefined, incoming: unknown): Record<string, unknown>;
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