import * as stubs from "../proto/orchestrator_service_grpc_pb";
import * as grpc from "@grpc/grpc-js";
export declare class GrpcClient {
    private readonly _hostAddress;
    private readonly _tls;
    private readonly _options;
    private readonly _credentials?;
    private _stub;
    /**
     * Creates a new GrpcClient instance.
     *
     * @param hostAddress The host address to connect to. Defaults to "localhost:4001".
     * @param options gRPC channel options.
     * @param useTLS Whether to use TLS. Defaults to false.
     * @param credentials Optional pre-configured channel credentials. If provided, useTLS is ignored.
     */
    constructor(hostAddress?: string, options?: grpc.ChannelOptions, useTLS?: boolean, credentials?: grpc.ChannelCredentials);
    get stub(): stubs.TaskHubSidecarServiceClient;
    _generateClient(): stubs.TaskHubSidecarServiceClient;
    _generateCredentials(): grpc.ChannelCredentials;
    _generateChannelOptions(options?: grpc.ChannelOptions): grpc.ChannelOptions;
}