import { Transport, TransportOptions } from '@improbable-eng/grpc-web/dist/typings/transports/Transport';
import { ServiceError } from '@vertexvis/scene-tree-protos/scenetree/protos/scene_tree_api_pb_service';
export declare function isGrpcServiceError(err: any): err is ServiceError;
export declare function webSocketSubscriptionTransportFactory(options: TransportOptions): Transport;
