fix(types): use grpc call credentials type (#790)

Co-authored-by: Alexander Fenster <[email protected]>

Author: JustinBeckwith

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

@@ -64,9 +64,7 @@ export interface ClientStubOptions {
   protocol?: string;
   servicePath?: string;
   port?: number;
-  // TODO: use sslCreds?: grpc.ChannelCredentials;
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  sslCreds?: any;
+  sslCreds?: grpc.ChannelCredentials;
   [index: string]: string | number | undefined | {};
 }
 

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

@@ -102,4 +102,4 @@ export {
   PaginationResponse,
 } from './clientInterface';
 
-export {ServiceError} from '@grpc/grpc-js';
+export {ServiceError, ChannelCredentials} from '@grpc/grpc-js';