import { type HeartbeatResponse } from "../../schemas/index";
import type { DelegateBase } from "../../schemas/delegate";
/**
 * Checks if a delegated provider is online by sending a heartbeat round-trip.
 * Can also be used to check if the local SDK worker is responsive.
 *
 * @param params - Delegation target to check
 * @param params.delegate - The provider to check (providerPublicKey + optional timeout)
 * @returns A promise that resolves to a heartbeat response if the provider is reachable.
 * @throws {QvacErrorBase} When the provider is unreachable or the response is invalid.
 *
 * @example
 * // Check if a delegated provider is online
 * try {
 *   await heartbeat({
 *     delegate: { providerPublicKey: "peerHex", timeout: 3000 },
 *   });
 *   console.log("Provider is online");
 * } catch {
 *   console.log("Provider is offline");
 * }
 *
 * @example
 * // Check if the local SDK worker is responsive
 * await heartbeat();
 */
export declare function heartbeat(params?: {
    delegate?: DelegateBase;
}): Promise<HeartbeatResponse>;
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