import type { MachinatWorker } from '@machinat/core/engine';
import MachinatQueue from '@machinat/core/queue';
import type { MessengerJob, MessengerResult } from './types';
declare type MessengerQueue = MachinatQueue<MessengerJob, MessengerResult>;
export default class MessengerWorker implements MachinatWorker<MessengerJob, MessengerResult> {
    token: string;
    consumeInterval: number;
    private _graphApiEntry;
    private _appSecretProof;
    private _started;
    private _isConsuming;
    private _consumptionTimeoutId;
    constructor(accessToken: string, consumeInterval: number, graphApiVersion: string, appSecret: undefined | string);
    get started(): boolean;
    start(queue: MessengerQueue): boolean;
    stop(queue: MessengerQueue): boolean;
    private _listenJobCallback;
    private _listenJob;
    private _consumeCallback;
    private _consume;
    private _executeJobsCallback;
    private _executeJobs;
}
export {};