import { Slot, SubnetID } from "@lodestar/types";
/**
 * Track if there's at least one aggregator on tuple (subnet, slot),
 * to only then insert attestations into the op pool
 */
export declare class AggregatorTracker {
    private subnetAggregatorsBySlot;
    get maxSlotsCached(): number;
    addAggregator(subnet: SubnetID, slot: Slot): void;
    shouldAggregate(subnet: SubnetID, slot: Slot): boolean;
    prune(): void;
}
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