export interface FollowerDeliveryState {
    queuedButUndeliveredIds: Set<number>;
    deliveredAwaitingAckIds: Set<number>;
    ackInFlightIds: Set<number>;
}
export declare function createFollowerDeliveryState(): FollowerDeliveryState;
export declare function resetFollowerDeliveryState(state: FollowerDeliveryState): void;
export declare function isFollowerInboxIdTracked(state: FollowerDeliveryState, inboxId: number): boolean;
export declare function queueFollowerInboxIds(state: FollowerDeliveryState, inboxIds: Iterable<number>): void;
export declare function markFollowerInboxIdsDelivered(state: FollowerDeliveryState, inboxIds: Iterable<number>): void;
export declare function hasDeliveredFollowerInboxIds(state: FollowerDeliveryState): boolean;
export declare function takeFollowerAckBatch(state: FollowerDeliveryState): number[];
export declare function markFollowerAckBatchSucceeded(state: FollowerDeliveryState, inboxIds: Iterable<number>): void;
export declare function markFollowerAckBatchFailed(state: FollowerDeliveryState, inboxIds: Iterable<number>): void;
export declare function drainFollowerAckBatches(state: FollowerDeliveryState, ackBatch: (inboxIds: number[]) => Promise<void>): Promise<void>;
export declare function getFollowerShutdownAckIds(state: FollowerDeliveryState): number[];