import type { SendTaskHeartbeatResponse } from "./service-client.js";
/**
 * Sends a heartbeat for the current task or to the provided task token.
 *
 * If called from outside of an {@link task}, the task token must be provided.
 *
 * If the task has a heartbeatTimeout set and the workflow has not received a heartbeat within the set duration,
 * the workflow will throw a {@link HeartbeatTimeout} and cancel the task.
 *
 * @returns {@link HeartbeatResponse} which has response.cancelled if the task was cancelled for any reason (ex: workflow succeeded, failed, or the task timed out).
 */
export declare function sendTaskHeartbeat(taskToken?: string): Promise<SendTaskHeartbeatResponse>;
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