chore: regenerate the code (#330)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2020-03-22 04:14:34,917 synthtool > Executing /tmpfs/src/git/autosynth/working_repo/synth.py.
2020-03-22 04:14:34,972 synthtool > Ensuring dependencies.
2020-03-22 04:14:34,977 synthtool > Cloning googleapis.
2020-03-22 04:14:35,309 synthtool > Pulling Docker image: gapic-generator-typescript:latest
latest: Pulling from gapic-images/gapic-generator-typescript
Digest: sha256:3762b8bcba247ef4d020ffc7043e2881a20b5fab0ffd98d542f365d3f3a3829d
Status: Image is up to date for gcr.io/gapic-images/gapic-generator-typescript:latest
2020-03-22 04:14:36,233 synthtool > Generating code for: google/cloud/bigquery/datatransfer/v1.
2020-03-22 04:14:37,440 synthtool > Generated code into /tmpfs/tmp/tmpp7wbqgxd.
.eslintignore
.eslintrc.yml
.github/ISSUE_TEMPLATE/bug_report.md
.github/ISSUE_TEMPLATE/feature_request.md
.github/ISSUE_TEMPLATE/support_request.md
.github/PULL_REQUEST_TEMPLATE.md
.github/publish.yml
.github/release-please.yml
.github/workflows/ci.yaml
.kokoro/common.cfg
.kokoro/continuous/node10/common.cfg
.kokoro/continuous/node10/docs.cfg
.kokoro/continuous/node10/lint.cfg
.kokoro/continuous/node10/samples-test.cfg
.kokoro/continuous/node10/system-test.cfg
.kokoro/continuous/node10/test.cfg
.kokoro/continuous/node12/common.cfg
.kokoro/continuous/node12/test.cfg
.kokoro/continuous/node8/common.cfg
.kokoro/continuous/node8/test.cfg
.kokoro/docs.sh
.kokoro/lint.sh
.kokoro/presubmit/node10/common.cfg
.kokoro/presubmit/node10/docs.cfg
.kokoro/presubmit/node10/lint.cfg
.kokoro/presubmit/node10/samples-test.cfg
.kokoro/presubmit/node10/system-test.cfg
.kokoro/presubmit/node10/test.cfg
.kokoro/presubmit/node12/common.cfg
.kokoro/presubmit/node12/test.cfg
.kokoro/presubmit/node8/common.cfg
.kokoro/presubmit/node8/test.cfg
.kokoro/presubmit/windows/common.cfg
.kokoro/presubmit/windows/test.cfg
.kokoro/publish.sh
.kokoro/release/docs.cfg
.kokoro/release/docs.sh
.kokoro/release/publish.cfg
.kokoro/samples-test.sh
.kokoro/system-test.sh
.kokoro/test.bat
.kokoro/test.sh
.kokoro/trampoline.sh
.mocharc.js
.nycrc
.prettierignore
.prettierrc
CODE_OF_CONDUCT.md
CONTRIBUTING.md
LICENSE
README.md
codecov.yaml
renovate.json
samples/README.md
npm WARN npm npm does not support Node.js v12.16.1
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 6, 8, 9, 10, 11.
npm WARN npm You can find the latest version at https://nodejs.org/
npm WARN deprecated [email protected]: Legacy versions of mkdirp are no longer supported. Please update to mkdirp 1.x. (Note that the API surface has changed to use Promises in 1.x.)

> [email protected] postinstall /tmpfs/src/git/autosynth/working_repo/node_modules/protobufjs
> node scripts/postinstall


> @google-cloud/[email protected] prepare /tmpfs/src/git/autosynth/working_repo
> npm run compile

npm WARN npm npm does not support Node.js v12.16.1
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 6, 8, 9, 10, 11.
npm WARN npm You can find the latest version at https://nodejs.org/

> @google-cloud/[email protected] compile /tmpfs/src/git/autosynth/working_repo
> tsc -p . && cp -r protos build/

npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.2.7 (node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/abbrev):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/abbrev' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.abbrev.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/ansi-regex):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/ansi-regex' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.ansi-regex.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/aproba):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/aproba' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.aproba.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/balanced-match):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/balanced-match' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.balanced-match.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/chownr):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/chownr' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.chownr.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/code-point-at):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/code-point-at' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.code-point-at.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/concat-map):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/concat-map' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.concat-map.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/console-control-strings):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/console-control-strings' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.console-control-strings.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/core-util-is):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/core-util-is' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.core-util-is.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/deep-extend):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/deep-extend' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.deep-extend.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/delegates):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/delegates' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.delegates.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/detect-libc):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/detect-libc' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.detect-libc.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/fs.realpath):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/fs.realpath' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.fs.realpath.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/has-unicode):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/has-unicode' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.has-unicode.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/inherits):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/inherits' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.inherits.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/ini):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/ini' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.ini.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/isarray):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/isarray' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.isarray.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/minimist):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/minimist' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.minimist.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/ms):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/ms' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.ms.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/npm-normalize-package-bin):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/npm-normalize-package-bin' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.npm-normalize-package-bin.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/number-is-nan):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/number-is-nan' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.number-is-nan.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/object-assign):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/object-assign' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.object-assign.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/os-homedir):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/os-homedir' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.os-homedir.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/os-tmpdir):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/os-tmpdir' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.os-tmpdir.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/path-is-absolute):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/path-is-absolute' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.path-is-absolute.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/process-nextick-args):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/process-nextick-args' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.process-nextick-args.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/safe-buffer):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/safe-buffer' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.safe-buffer.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/safer-buffer):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/safer-buffer' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.safer-buffer.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/sax):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/sax' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.sax.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/semver):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/semver' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.semver.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/set-blocking):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/set-blocking' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.set-blocking.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/signal-exit):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/signal-exit' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.signal-exit.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/strip-json-comments):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/strip-json-comments' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.strip-json-comments.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/util-deprecate):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/util-deprecate' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.util-deprecate.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/wrappy):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/wrappy' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.wrappy.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/yallist):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/yallist' -> '/tmpfs/src/git/autosynth/working_repo/node_modules/fsevents/node_modules/.yallist.DELETE'

added 983 packages from 929 contributors and audited 6730 packages in 22.703s
found 1 low severity vulnerability
  run `npm audit fix` to fix them, or `npm audit` for details
npm WARN npm npm does not support Node.js v12.16.1
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 6, 8, 9, 10, 11.
npm WARN npm You can find the latest version at https://nodejs.org/

> @google-cloud/[email protected] fix /tmpfs/src/git/autosynth/working_repo
> gts fix

npm WARN npm npm does not support Node.js v12.16.1
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 6, 8, 9, 10, 11.
npm WARN npm You can find the latest version at https://nodejs.org/

Usage: npm <command>

where <command> is one of:
    access, adduser, audit, bin, bugs, c, cache, ci, cit,
    completion, config, create, ddp, dedupe, deprecate,
    dist-tag, docs, doctor, edit, explore, get, help,
    help-search, hook, i, init, install, install-test, it, link,
    list, ln, login, logout, ls, outdated, owner, pack, ping,
    prefix, profile, prune, publish, rb, rebuild, repo, restart,
    root, run, run-script, s, se, search, set, shrinkwrap, star,
    stars, start, stop, t, team, test, token, tst, un,
    uninstall, unpublish, unstar, up, update, v, version, view,
    whoami

npm <command> -h     quick help on <command>
npm -l           display full usage info
npm help <term>  search for help on <term>
npm help npm     involved overview

Specify configs in the ini-formatted file:
    /home/kbuilder/.npmrc
or on the command line via: npm <command> --key value
Config info can be viewed via: npm help config

[email protected] /usr/local/lib/node_modules/npm

Did you mean this?
    completion
2020-03-22 04:15:08,286 synthtool > Wrote metadata to synth.metadata.

```
</details>

packages/google-cloud-bigquery-datatransfer/.jsdoc.js

@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

packages/google-cloud-bigquery-datatransfer/src/v1/data_transfer_service_client.ts

@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -43,7 +43,12 @@ const version = require('../../../package.json').version;
  * @memberof v1
  */
 export class DataTransferServiceClient {
-  private _descriptors: Descriptors = {page: {}, stream: {}, longrunning: {}};
+  private _descriptors: Descriptors = {
+    page: {},
+    stream: {},
+    longrunning: {},
+    batching: {},
+  };
   private _innerApiCalls: {[name: string]: Function};
   private _pathTemplates: {[name: string]: gax.PathTemplate};
   private _terminated = false;
@@ -269,7 +274,8 @@ export class DataTransferServiceClient {
           if (this._terminated) {
             return Promise.reject('The client has already been closed.');
           }
-          return stub[methodName].apply(stub, args);
+          const func = stub[methodName];
+          return func.apply(stub, args);
         },
         (err: Error | null | undefined) => () => {
           throw err;

packages/google-cloud-bigquery-datatransfer/system-test/fixtures/sample/src/index.js

@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

packages/google-cloud-bigquery-datatransfer/system-test/fixtures/sample/src/index.ts

@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

packages/google-cloud-bigquery-datatransfer/system-test/install.ts

@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

packages/google-cloud-bigquery-datatransfer/test/gapic-data_transfer_service-v1.ts

@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

packages/google-cloud-bigquery-datatransfer/webpack.config.js

@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.