import { Logger } from '@nestjs/common';
import { HeartbeatOptions } from '../';
import { HeartbeatTask } from '../interfaces';
export declare class TtlScheduler {
    private heartbeatOptions;
    private task;
    logger: Logger;
    constructor(heartbeatOptions: HeartbeatOptions, task: HeartbeatTask);
    /**
     * add a service to the checks loop
     *
     * @param instanceId instance id
     */
    add(instanceId: string): void;
    remove(instanceId: string): void;
    private computeHeartbeatInterval;
}