import { ModelDefinition } from '@nestjs/mongoose';
import { Document } from 'mongoose';
/**
 * Lock
 *
 * Represents a distributed lock document stored in MongoDB.
 *
 * Each lock is uniquely identified by a `lockKey` and claimed by a specific
 * service instance via `serviceId`. Locks have an expiration date `expiresAt`
 * to automatically release stale locks and avoid deadlocks.
 */
export declare class Lock extends Document {
    /**
     * Unique identifier for the lock resource.
     *
     * Ensures that only one lock exists per key.
     */
    lockKey: string;
    /**
     * Identifier of the service instance that owns this lock.
     *
     * Used to verify ownership before releasing a lock.
     */
    serviceId: string;
    /**
     * Expiration date and time of the lock.
     *
     * MongoDB TTL index configured with `expires: 0` automatically removes the lock document
     * when the `expiresAt` time is reached, preventing stale locks from persisting.
     */
    expiresAt: Date;
}
/**
 * Model definition for the Lock schema.
 *
 * Used by Mongoose to create the model and enable typing.
 */
export declare const LockDefinition: ModelDefinition;