Export GoogleAuth for consumption (#299)

Author: JustinBeckwith

packages/packages/google-gax/src/grpc.ts

@@ -41,7 +41,6 @@ import * as semver from 'semver';
 import {GoogleAuth, GoogleAuthOptions} from 'google-auth-library';
 import * as gax from './gax';
 import {OutgoingHttpHeaders} from 'http';
-import {AnyDecoder} from './longrunning';
 
 let googleProtoFilesDir = require('google-proto-files')('..');
 googleProtoFilesDir = path.normalize(googleProtoFilesDir);

packages/packages/google-gax/src/index.ts

@@ -35,8 +35,9 @@ import * as extend from 'extend';
 
 import * as operationsClient from './operations_client';
 import * as routingHeader from './routing_header';
-import {GrpcClient, GrpcClientOptions, GoogleProtoFilesRoot} from './grpc';
+import {GrpcClient, GrpcClientOptions} from './grpc';
 
+export {GoogleAuth, GoogleAuthOptions} from 'google-auth-library';
 export {routingHeader};
 export {constructSettings} from './gax';
 export {StreamType, StreamDescriptor} from './streaming';