import { ClientMiddleware } from 'nice-grpc';
/**
 * Create a simple gRPC `Interceptor` that attaches a given access token to any request
 * a client sends. The token is attached with the `Bearer` auth-scheme.
 *
 * The interceptor does not insert the access token if the intercepted call
 * already has an `Authorization` header.
 *
 * @param token The access token that should be added to the gRPC request.
 *
 * @returns A gRPC client middleware (interceptor) that attaches the given token to each request, if no other authorization header is present.
 */
export declare const newAccessTokenInterceptor: (token: string) => ClientMiddleware;