import { experimental } from '@grpc/grpc-js';
import { Duration__Output } from './generated/google/protobuf/Duration';
import Duration = experimental.Duration;
/**
 * Convert a Duration protobuf message object to a Duration object as used in
 * the ServiceConfig definition. The difference is that the protobuf message
 * defines seconds as a long, which is represented as a string in JavaScript,
 * and the one used in the service config defines it as a number.
 * @param duration
 */
export declare function protoDurationToDuration(duration: Duration__Output): Duration;