import { ExternalTask, ExternalTaskResultBase } from './data_models/external_task/index';
/**
 * Definition of the HandleExternalTask Callback.
 */
export declare type HandleExternalTaskAction<TPayload, TResult> = (externalTask: ExternalTask<TPayload>) => Promise<ExternalTaskResultBase>;
/**
 * Periodically fetches, locks and processes ExternalTasks for a given topic.
 */
export interface IExternalTaskWorker {
    /**
     * Id of worker
     */
    workerId: string;
    /**
     * Tells the worker to start polling for ExternalTasks.
     */
    start(): void;
    /**
     * Tells the worker to stop polling for ExternalTasks.
     */
    stop(): void;
}