/**
 *  The indexer's own sync state for one chain (envio `chain_metadata`). Compare
 *  `latestProcessedBlock` to `blockHeight` to gauge indexer lag.
 *
 * @category indexing
 */
export type IndexerSyncStatus = {
    /** Chain id the row describes. */
    chainId: number;
    /** Last block the indexer fully processed; null before the first block lands. */
    latestProcessedBlock: number | null;
    /** Chain head height as the indexer last saw it; null until first fetched. */
    blockHeight: number | null;
    /**
     *  Lifetime count of events the indexer has processed on this chain. `null` on
     *  the rare row where envio has not populated the counter yet — Hasura declares
     *  the column nullable, so this is the wire's shape, not a defensive guess.
     */
    numEventsProcessed: number | null;
};
/**
 *  Indexer sync state from chain_metadata (the indexer's own view of head).
 *  Null if the indexer has no row for this chain; throws on request failure.
 */
export declare function getSyncStatus(chainId: number, indexerUrl: string): Promise<IndexerSyncStatus | null>;