import type { Db } from 'mongodb';
import type { IContainer } from 'node-cqrs';
import type { IEvent, IEventLocker } from '../interfaces/index.ts';
import { AbstractMongoAccessor } from './AbstractMongoAccessor.ts';
import type { MongoProjectionDataParams } from './MongoProjectionDataParams.ts';
export type MongoEventLockerParams = MongoProjectionDataParams & {
    /**
     * (Optional) Time-to-live (TTL) duration in milliseconds
     * for which an event remains in the "processing" state until released.
     *
     * @default MongoEventLocker.DEFAULT_EVENT_LOCK_TTL
     */
    eventLockTtl?: number;
    /**
     * (Optional) MongoDB collection name used to store per-event processing locks.
     *
     * @default MongoEventLocker.DEFAULT_EVENT_LOCKS_COLLECTION
     */
    eventLocksCollection?: string;
    /**
     * (Optional) MongoDB collection name used to store the last processed event per projection.
     *
     * @default MongoEventLocker.DEFAULT_VIEW_LOCKS_COLLECTION
     */
    viewLocksCollection?: string;
};
/**
 * MongoDB-backed implementation of IEventLocker.
 *
 * Uses two collections:
 * - `ncqrs_event_locks`: tracks per-event processing state
 * - `ncqrs_view_locks`: stores the last processed event per projection
 *
 * Event lock state machine: nil → processing → processed
 */
export declare class MongoEventLocker extends AbstractMongoAccessor implements IEventLocker {
    #private;
    static DEFAULT_EVENT_LOCK_TTL: number;
    static DEFAULT_EVENT_LOCKS_COLLECTION: string;
    static DEFAULT_VIEW_LOCKS_COLLECTION: string;
    constructor(o: Partial<Pick<IContainer, 'viewModelMongoDb' | 'viewModelMongoDbFactory'>> & MongoEventLockerParams);
    protected initialize(db: Db): Promise<void>;
    tryMarkAsProjecting(event: IEvent): Promise<boolean>;
    markAsProjected(event: IEvent): Promise<void>;
    markAsLastEvent(event: IEvent): Promise<void>;
    getLastEvent(): Promise<IEvent | undefined>;
}