import type { Metadata } from 'grpc-web';
import { type ServiceLocator } from './config';
/** Build grpc-web Metadata including Authorization, domain and application headers. */
export declare function buildMetadata(extra?: Metadata): Promise<Metadata>;
/**
* Create a typed grpc-web client given the generated constructor.
* The constructor signature is typically (hostname: string, credentials: null, options: object)
*/
export declare function createGrpcClient<TClient>(serviceId: string, Ctor: new (hostname: string, credentials: null, options: {
    [key: string]: any;
}) => TClient, opts?: {
    withCredentials?: boolean;
    format?: 'text' | 'binary';
    endpointOverride?: string;
    serviceLocator?: ServiceLocator;
}): TClient;