From 5aca94fc3213388b28cea97685132c3f4248e425 Mon Sep 17 00:00:00 2001
From: DPE bot <dpebot@google.com>
Date: Fri, 14 Sep 2018 08:43:21 -0700
Subject: [PATCH] Switch to let/const (#194)

---
 .../smoke-test/image_annotator_smoke_test.js  |  20 +-
 .../google/cloud/vision/v1/doc_geometry.js    |   8 +-
 .../cloud/vision/v1/doc_image_annotator.js    |  68 +--
 .../cloud/vision/v1/doc_text_annotation.js    |  12 +-
 .../cloud/vision/v1/doc_web_detection.js      |   2 +-
 .../doc/google/longrunning/doc_operations.js  |  12 +-
 .../src/v1/doc/google/protobuf/doc_any.js     |   2 +-
 .../v1/doc/google/protobuf/doc_wrappers.js    |  18 +-
 .../src/v1/doc/google/rpc/doc_status.js       |   2 +-
 .../src/v1/doc/google/type/doc_color.js       |   2 +-
 .../src/v1/doc/google/type/doc_latlng.js      |   2 +-
 .../src/v1/image_annotator_client.js          |  46 +-
 .../cloud/vision/v1p1beta1/doc_geometry.js    |   6 +-
 .../vision/v1p1beta1/doc_image_annotator.js   |  44 +-
 .../vision/v1p1beta1/doc_text_annotation.js   |  12 +-
 .../vision/v1p1beta1/doc_web_detection.js     |   2 +-
 .../v1p1beta1/doc/google/protobuf/doc_any.js  |   2 +-
 .../doc/google/protobuf/doc_wrappers.js       |  18 +-
 .../v1p1beta1/doc/google/rpc/doc_status.js    |   2 +-
 .../v1p1beta1/doc/google/type/doc_color.js    |   2 +-
 .../v1p1beta1/doc/google/type/doc_latlng.js   |   2 +-
 .../src/v1p1beta1/image_annotator_client.js   |  20 +-
 .../cloud/vision/v1p2beta1/doc_geometry.js    |   8 +-
 .../vision/v1p2beta1/doc_image_annotator.js   |  66 +--
 .../vision/v1p2beta1/doc_text_annotation.js   |  12 +-
 .../vision/v1p2beta1/doc_web_detection.js     |   2 +-
 .../doc/google/longrunning/doc_operations.js  |  12 +-
 .../v1p2beta1/doc/google/protobuf/doc_any.js  |   2 +-
 .../doc/google/protobuf/doc_wrappers.js       |  18 +-
 .../v1p2beta1/doc/google/rpc/doc_status.js    |   2 +-
 .../v1p2beta1/doc/google/type/doc_color.js    |   2 +-
 .../v1p2beta1/doc/google/type/doc_latlng.js   |   2 +-
 .../src/v1p2beta1/image_annotator_client.js   |  46 +-
 .../cloud/vision/v1p3beta1/doc_geometry.js    |  10 +-
 .../vision/v1p3beta1/doc_image_annotator.js   |  68 +--
 .../vision/v1p3beta1/doc_product_search.js    |   8 +-
 .../v1p3beta1/doc_product_search_service.js   |  58 +--
 .../vision/v1p3beta1/doc_text_annotation.js   |  12 +-
 .../vision/v1p3beta1/doc_web_detection.js     |   2 +-
 .../doc/google/longrunning/doc_operations.js  |  12 +-
 .../v1p3beta1/doc/google/protobuf/doc_any.js  |   2 +-
 .../doc/google/protobuf/doc_empty.js          |   2 +-
 .../doc/google/protobuf/doc_field_mask.js     |   2 +-
 .../doc/google/protobuf/doc_timestamp.js      |   2 +-
 .../doc/google/protobuf/doc_wrappers.js       |  18 +-
 .../v1p3beta1/doc/google/rpc/doc_status.js    |   2 +-
 .../v1p3beta1/doc/google/type/doc_color.js    |   2 +-
 .../v1p3beta1/doc/google/type/doc_latlng.js   |   2 +-
 .../src/v1p3beta1/image_annotator_client.js   |  46 +-
 .../src/v1p3beta1/product_search_client.js    | 238 +++++------
 packages/google-cloud-vision/test/gapic-v1.js |  40 +-
 .../test/gapic-v1p1beta1.js                   |  18 +-
 .../test/gapic-v1p2beta1.js                   |  40 +-
 .../test/gapic-v1p3beta1.js                   | 402 +++++++++---------
 54 files changed, 731 insertions(+), 731 deletions(-)

diff --git a/packages/google-cloud-vision/smoke-test/image_annotator_smoke_test.js b/packages/google-cloud-vision/smoke-test/image_annotator_smoke_test.js
index 74ccd41a825..5b5ae522c67 100644
--- a/packages/google-cloud-vision/smoke-test/image_annotator_smoke_test.js
+++ b/packages/google-cloud-vision/smoke-test/image_annotator_smoke_test.js
@@ -18,30 +18,30 @@ describe('ImageAnnotatorSmokeTest', () => {
   it('successfully makes a call to the service', done => {
     const vision = require('../src');
 
-    var client = new vision.v1p3beta1.ImageAnnotatorClient({
+    const client = new vision.v1p3beta1.ImageAnnotatorClient({
       // optional auth parameters.
     });
 
-    var gcsImageUri = 'gs://gapic-toolkit/President_Barack_Obama.jpg';
-    var source = {
+    const gcsImageUri = 'gs://gapic-toolkit/President_Barack_Obama.jpg';
+    const source = {
       gcsImageUri: gcsImageUri,
     };
-    var image = {
+    const image = {
       source: source,
     };
-    var type = 'FACE_DETECTION';
-    var featuresElement = {
+    const type = 'FACE_DETECTION';
+    const featuresElement = {
       type: type,
     };
-    var features = [featuresElement];
-    var requestsElement = {
+    const features = [featuresElement];
+    const requestsElement = {
       image: image,
       features: features,
     };
-    var requests = [requestsElement];
+    const requests = [requestsElement];
     client.batchAnnotateImages({requests: requests})
       .then(responses => {
-        var response = responses[0];
+        const response = responses[0];
         console.log(response);
       })
       .then(done)
diff --git a/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_geometry.js b/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_geometry.js
index ca1ef8c2e51..77d9f8e9cda 100644
--- a/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_geometry.js
+++ b/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_geometry.js
@@ -29,7 +29,7 @@
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.Vertex definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/geometry.proto}
  */
-var Vertex = {
+const Vertex = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -48,7 +48,7 @@ var Vertex = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.NormalizedVertex definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/geometry.proto}
  */
-var NormalizedVertex = {
+const NormalizedVertex = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -69,7 +69,7 @@ var NormalizedVertex = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.BoundingPoly definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/geometry.proto}
  */
-var BoundingPoly = {
+const BoundingPoly = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -91,6 +91,6 @@ var BoundingPoly = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.Position definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/geometry.proto}
  */
-var Position = {
+const Position = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_image_annotator.js b/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_image_annotator.js
index 9ab159a3de0..8587fddf333 100644
--- a/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_image_annotator.js
+++ b/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_image_annotator.js
@@ -38,7 +38,7 @@
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.Feature definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var Feature = {
+const Feature = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -150,7 +150,7 @@ var Feature = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.ImageSource definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var ImageSource = {
+const ImageSource = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -173,7 +173,7 @@ var ImageSource = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.Image definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var Image = {
+const Image = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -265,7 +265,7 @@ var Image = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.FaceAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var FaceAnnotation = {
+const FaceAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -489,7 +489,7 @@ var FaceAnnotation = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.LocationInfo definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var LocationInfo = {
+const LocationInfo = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -509,7 +509,7 @@ var LocationInfo = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.Property definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var Property = {
+const Property = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -570,7 +570,7 @@ var Property = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.EntityAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var EntityAnnotation = {
+const EntityAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -600,7 +600,7 @@ var EntityAnnotation = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.LocalizedObjectAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var LocalizedObjectAnnotation = {
+const LocalizedObjectAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -645,7 +645,7 @@ var LocalizedObjectAnnotation = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.SafeSearchAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var SafeSearchAnnotation = {
+const SafeSearchAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -666,7 +666,7 @@ var SafeSearchAnnotation = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.LatLongRect definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var LatLongRect = {
+const LatLongRect = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -690,7 +690,7 @@ var LatLongRect = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.ColorInfo definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var ColorInfo = {
+const ColorInfo = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -706,7 +706,7 @@ var ColorInfo = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.DominantColorsAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var DominantColorsAnnotation = {
+const DominantColorsAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -722,7 +722,7 @@ var DominantColorsAnnotation = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.ImageProperties definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var ImageProperties = {
+const ImageProperties = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -746,7 +746,7 @@ var ImageProperties = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.CropHint definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var CropHint = {
+const CropHint = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -762,7 +762,7 @@ var CropHint = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.CropHintsAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var CropHintsAnnotation = {
+const CropHintsAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -781,7 +781,7 @@ var CropHintsAnnotation = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.CropHintsParams definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var CropHintsParams = {
+const CropHintsParams = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -795,7 +795,7 @@ var CropHintsParams = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.WebDetectionParams definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var WebDetectionParams = {
+const WebDetectionParams = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -831,7 +831,7 @@ var WebDetectionParams = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.ImageContext definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var ImageContext = {
+const ImageContext = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -858,7 +858,7 @@ var ImageContext = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.AnnotateImageRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var AnnotateImageRequest = {
+const AnnotateImageRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -877,7 +877,7 @@ var AnnotateImageRequest = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.ImageAnnotationContext definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var ImageAnnotationContext = {
+const ImageAnnotationContext = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -960,7 +960,7 @@ var ImageAnnotationContext = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.AnnotateImageResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var AnnotateImageResponse = {
+const AnnotateImageResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -982,7 +982,7 @@ var AnnotateImageResponse = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.AnnotateFileResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var AnnotateFileResponse = {
+const AnnotateFileResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -998,7 +998,7 @@ var AnnotateFileResponse = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.BatchAnnotateImagesRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var BatchAnnotateImagesRequest = {
+const BatchAnnotateImagesRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1014,7 +1014,7 @@ var BatchAnnotateImagesRequest = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.BatchAnnotateImagesResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var BatchAnnotateImagesResponse = {
+const BatchAnnotateImagesResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1045,7 +1045,7 @@ var BatchAnnotateImagesResponse = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.AsyncAnnotateFileRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var AsyncAnnotateFileRequest = {
+const AsyncAnnotateFileRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1061,7 +1061,7 @@ var AsyncAnnotateFileRequest = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.AsyncAnnotateFileResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var AsyncAnnotateFileResponse = {
+const AsyncAnnotateFileResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1078,7 +1078,7 @@ var AsyncAnnotateFileResponse = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.AsyncBatchAnnotateFilesRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var AsyncBatchAnnotateFilesRequest = {
+const AsyncBatchAnnotateFilesRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1095,7 +1095,7 @@ var AsyncBatchAnnotateFilesRequest = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.AsyncBatchAnnotateFilesResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var AsyncBatchAnnotateFilesResponse = {
+const AsyncBatchAnnotateFilesResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1115,7 +1115,7 @@ var AsyncBatchAnnotateFilesResponse = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.InputConfig definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var InputConfig = {
+const InputConfig = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1144,7 +1144,7 @@ var InputConfig = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.OutputConfig definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var OutputConfig = {
+const OutputConfig = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1159,7 +1159,7 @@ var OutputConfig = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.GcsSource definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var GcsSource = {
+const GcsSource = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1187,7 +1187,7 @@ var GcsSource = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.GcsDestination definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var GcsDestination = {
+const GcsDestination = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1213,7 +1213,7 @@ var GcsDestination = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.OperationMetadata definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/image_annotator.proto}
  */
-var OperationMetadata = {
+const OperationMetadata = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -1258,7 +1258,7 @@ var OperationMetadata = {
  * @enum {number}
  * @memberof google.cloud.vision.v1
  */
-var Likelihood = {
+const Likelihood = {
 
   /**
    * Unknown likelihood.
diff --git a/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_text_annotation.js b/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_text_annotation.js
index 4e08e8c8178..e42ed35dc14 100644
--- a/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_text_annotation.js
+++ b/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_text_annotation.js
@@ -36,7 +36,7 @@
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.TextAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/text_annotation.proto}
  */
-var TextAnnotation = {
+const TextAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -167,7 +167,7 @@ var TextAnnotation = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.Page definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/text_annotation.proto}
  */
-var Page = {
+const Page = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -220,7 +220,7 @@ var Page = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.Block definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/text_annotation.proto}
  */
-var Block = {
+const Block = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -302,7 +302,7 @@ var Block = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.Paragraph definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/text_annotation.proto}
  */
-var Paragraph = {
+const Paragraph = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -346,7 +346,7 @@ var Paragraph = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.Word definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/text_annotation.proto}
  */
-var Word = {
+const Word = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -387,6 +387,6 @@ var Word = {
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.Symbol definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/text_annotation.proto}
  */
-var Symbol = {
+const Symbol = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_web_detection.js b/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_web_detection.js
index 5ed9f6e828a..5583eb5d508 100644
--- a/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_web_detection.js
+++ b/packages/google-cloud-vision/src/v1/doc/google/cloud/vision/v1/doc_web_detection.js
@@ -55,7 +55,7 @@
  * @memberof google.cloud.vision.v1
  * @see [google.cloud.vision.v1.WebDetection definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1/web_detection.proto}
  */
-var WebDetection = {
+const WebDetection = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
diff --git a/packages/google-cloud-vision/src/v1/doc/google/longrunning/doc_operations.js b/packages/google-cloud-vision/src/v1/doc/google/longrunning/doc_operations.js
index 79ef6344437..4af5d7d3574 100644
--- a/packages/google-cloud-vision/src/v1/doc/google/longrunning/doc_operations.js
+++ b/packages/google-cloud-vision/src/v1/doc/google/longrunning/doc_operations.js
@@ -58,7 +58,7 @@
  * @memberof google.longrunning
  * @see [google.longrunning.Operation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var Operation = {
+const Operation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -72,7 +72,7 @@ var Operation = {
  * @memberof google.longrunning
  * @see [google.longrunning.GetOperationRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var GetOperationRequest = {
+const GetOperationRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -95,7 +95,7 @@ var GetOperationRequest = {
  * @memberof google.longrunning
  * @see [google.longrunning.ListOperationsRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var ListOperationsRequest = {
+const ListOperationsRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -114,7 +114,7 @@ var ListOperationsRequest = {
  * @memberof google.longrunning
  * @see [google.longrunning.ListOperationsResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var ListOperationsResponse = {
+const ListOperationsResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -128,7 +128,7 @@ var ListOperationsResponse = {
  * @memberof google.longrunning
  * @see [google.longrunning.CancelOperationRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var CancelOperationRequest = {
+const CancelOperationRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -142,6 +142,6 @@ var CancelOperationRequest = {
  * @memberof google.longrunning
  * @see [google.longrunning.DeleteOperationRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var DeleteOperationRequest = {
+const DeleteOperationRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1/doc/google/protobuf/doc_any.js b/packages/google-cloud-vision/src/v1/doc/google/protobuf/doc_any.js
index c5c5bbafa23..3accb1fc0d8 100644
--- a/packages/google-cloud-vision/src/v1/doc/google/protobuf/doc_any.js
+++ b/packages/google-cloud-vision/src/v1/doc/google/protobuf/doc_any.js
@@ -131,6 +131,6 @@
  * @memberof google.protobuf
  * @see [google.protobuf.Any definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/any.proto}
  */
-var Any = {
+const Any = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1/doc/google/protobuf/doc_wrappers.js b/packages/google-cloud-vision/src/v1/doc/google/protobuf/doc_wrappers.js
index 791b600ab1d..363b6391ac1 100644
--- a/packages/google-cloud-vision/src/v1/doc/google/protobuf/doc_wrappers.js
+++ b/packages/google-cloud-vision/src/v1/doc/google/protobuf/doc_wrappers.js
@@ -27,7 +27,7 @@
  * @memberof google.protobuf
  * @see [google.protobuf.DoubleValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var DoubleValue = {
+const DoubleValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -43,7 +43,7 @@ var DoubleValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.FloatValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var FloatValue = {
+const FloatValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -59,7 +59,7 @@ var FloatValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.Int64Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var Int64Value = {
+const Int64Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -75,7 +75,7 @@ var Int64Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.UInt64Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var UInt64Value = {
+const UInt64Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -91,7 +91,7 @@ var UInt64Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.Int32Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var Int32Value = {
+const Int32Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -107,7 +107,7 @@ var Int32Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.UInt32Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var UInt32Value = {
+const UInt32Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -123,7 +123,7 @@ var UInt32Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.BoolValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var BoolValue = {
+const BoolValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -139,7 +139,7 @@ var BoolValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.StringValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var StringValue = {
+const StringValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -155,6 +155,6 @@ var StringValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.BytesValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var BytesValue = {
+const BytesValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1/doc/google/rpc/doc_status.js b/packages/google-cloud-vision/src/v1/doc/google/rpc/doc_status.js
index 7122f1682e0..13cfcab1021 100644
--- a/packages/google-cloud-vision/src/v1/doc/google/rpc/doc_status.js
+++ b/packages/google-cloud-vision/src/v1/doc/google/rpc/doc_status.js
@@ -87,6 +87,6 @@
  * @memberof google.rpc
  * @see [google.rpc.Status definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/rpc/status.proto}
  */
-var Status = {
+const Status = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1/doc/google/type/doc_color.js b/packages/google-cloud-vision/src/v1/doc/google/type/doc_color.js
index 8ae80246fe3..c571f13c9a8 100644
--- a/packages/google-cloud-vision/src/v1/doc/google/type/doc_color.js
+++ b/packages/google-cloud-vision/src/v1/doc/google/type/doc_color.js
@@ -159,6 +159,6 @@
  * @memberof google.type
  * @see [google.type.Color definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/type/color.proto}
  */
-var Color = {
+const Color = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1/doc/google/type/doc_latlng.js b/packages/google-cloud-vision/src/v1/doc/google/type/doc_latlng.js
index 76150dc3be1..abc54303752 100644
--- a/packages/google-cloud-vision/src/v1/doc/google/type/doc_latlng.js
+++ b/packages/google-cloud-vision/src/v1/doc/google/type/doc_latlng.js
@@ -66,6 +66,6 @@
  * @memberof google.type
  * @see [google.type.LatLng definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/type/latlng.proto}
  */
-var LatLng = {
+const LatLng = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1/image_annotator_client.js b/packages/google-cloud-vision/src/v1/image_annotator_client.js
index e6c346a9579..63ac04e9bb7 100644
--- a/packages/google-cloud-vision/src/v1/image_annotator_client.js
+++ b/packages/google-cloud-vision/src/v1/image_annotator_client.js
@@ -74,13 +74,13 @@ class ImageAnnotatorClient {
     // Create a `gaxGrpc` object, with any grpc-specific options
     // sent to the client.
     opts.scopes = this.constructor.scopes;
-    var gaxGrpc = new gax.GrpcClient(opts);
+    const gaxGrpc = new gax.GrpcClient(opts);
 
     // Save the auth object to the client, for use by other methods.
     this.auth = gaxGrpc.auth;
 
     // Determine the client header string.
-    var clientHeader = [
+    const clientHeader = [
       `gl-node/${process.version}`,
       `grpc/${gaxGrpc.grpcVersion}`,
       `gax/${gax.version}`,
@@ -91,14 +91,14 @@ class ImageAnnotatorClient {
     }
 
     // Load the applicable protos.
-    var protos = merge(
+    const protos = merge(
       {},
       gaxGrpc.loadProto(
         path.join(__dirname, '..', '..', 'protos'),
         'google/cloud/vision/v1/image_annotator.proto'
       )
     );
-    var protoFilesRoot = new gax.GoogleProtoFilesRoot();
+    let protoFilesRoot = new gax.GoogleProtoFilesRoot();
     protoFilesRoot = protobuf.loadSync(
       path.join(
         __dirname,
@@ -118,10 +118,10 @@ class ImageAnnotatorClient {
       grpc: gaxGrpc.grpc,
     }).operationsClient(opts);
 
-    var asyncBatchAnnotateFilesResponse = protoFilesRoot.lookup(
+    const asyncBatchAnnotateFilesResponse = protoFilesRoot.lookup(
       'google.cloud.vision.v1.AsyncBatchAnnotateFilesResponse'
     );
-    var asyncBatchAnnotateFilesMetadata = protoFilesRoot.lookup(
+    const asyncBatchAnnotateFilesMetadata = protoFilesRoot.lookup(
       'google.cloud.vision.v1.OperationMetadata'
     );
 
@@ -138,7 +138,7 @@ class ImageAnnotatorClient {
     };
 
     // Put together the default options sent with requests.
-    var defaults = gaxGrpc.constructSettings(
+    const defaults = gaxGrpc.constructSettings(
       'google.cloud.vision.v1.ImageAnnotator',
       gapicConfig,
       opts.clientConfig,
@@ -152,14 +152,14 @@ class ImageAnnotatorClient {
 
     // Put together the "service stub" for
     // google.cloud.vision.v1.ImageAnnotator.
-    var imageAnnotatorStub = gaxGrpc.createStub(
+    const imageAnnotatorStub = gaxGrpc.createStub(
       protos.google.cloud.vision.v1.ImageAnnotator,
       opts
     );
 
     // Iterate over each of the methods that the service provides
     // and create an API call method for each.
-    var imageAnnotatorStubMethods = [
+    const imageAnnotatorStubMethods = [
       'batchAnnotateImages',
       'asyncBatchAnnotateFiles',
     ];
@@ -168,7 +168,7 @@ class ImageAnnotatorClient {
         imageAnnotatorStub.then(
           stub =>
             function() {
-              var args = Array.prototype.slice.call(arguments, 0);
+              const args = Array.prototype.slice.call(arguments, 0);
               return stub[methodName].apply(stub, args);
             }
         ),
@@ -240,14 +240,14 @@ class ImageAnnotatorClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1.ImageAnnotatorClient({
+   * const client = new vision.v1.ImageAnnotatorClient({
    *   // optional auth parameters.
    * });
    *
-   * var requests = [];
+   * const requests = [];
    * client.batchAnnotateImages({requests: requests})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -293,42 +293,42 @@ class ImageAnnotatorClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1.ImageAnnotatorClient({
+   * const client = new vision.v1.ImageAnnotatorClient({
    *   // optional auth parameters.
    * });
    *
-   * var requests = [];
+   * const requests = [];
    *
    * // Handle the operation using the promise pattern.
    * client.asyncBatchAnnotateFiles({requests: requests})
    *   .then(responses => {
-   *     var operation = responses[0];
-   *     var initialApiResponse = responses[1];
+   *     const operation = responses[0];
+   *     const initialApiResponse = responses[1];
    *
    *     // Operation#promise starts polling for the completion of the LRO.
    *     return operation.promise();
    *   })
    *   .then(responses => {
    *     // The final result of the operation.
-   *     var result = responses[0];
+   *     const result = responses[0];
    *
    *     // The metadata value of the completed operation.
-   *     var metadata = responses[1];
+   *     const metadata = responses[1];
    *
    *     // The response of the api call returning the complete operation.
-   *     var finalApiResponse = responses[2];
+   *     const finalApiResponse = responses[2];
    *   })
    *   .catch(err => {
    *     console.error(err);
    *   });
    *
-   * var requests = [];
+   * const requests = [];
    *
    * // Handle the operation using the event emitter pattern.
    * client.asyncBatchAnnotateFiles({requests: requests})
    *   .then(responses => {
-   *     var operation = responses[0];
-   *     var initialApiResponse = responses[1];
+   *     const operation = responses[0];
+   *     const initialApiResponse = responses[1];
    *
    *     // Adding a listener for the "complete" event starts polling for the
    *     // completion of the operation.
diff --git a/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_geometry.js b/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_geometry.js
index 1e00a48c1f1..3ec7053728d 100644
--- a/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_geometry.js
+++ b/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_geometry.js
@@ -29,7 +29,7 @@
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.Vertex definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/geometry.proto}
  */
-var Vertex = {
+const Vertex = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -45,7 +45,7 @@ var Vertex = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.BoundingPoly definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/geometry.proto}
  */
-var BoundingPoly = {
+const BoundingPoly = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -67,6 +67,6 @@ var BoundingPoly = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.Position definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/geometry.proto}
  */
-var Position = {
+const Position = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_image_annotator.js b/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_image_annotator.js
index 1de4a13f287..85b8843cddd 100644
--- a/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_image_annotator.js
+++ b/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_image_annotator.js
@@ -38,7 +38,7 @@
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.Feature definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var Feature = {
+const Feature = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -134,7 +134,7 @@ var Feature = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.ImageSource definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var ImageSource = {
+const ImageSource = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -157,7 +157,7 @@ var ImageSource = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.Image definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var Image = {
+const Image = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -249,7 +249,7 @@ var Image = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.FaceAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var FaceAnnotation = {
+const FaceAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -473,7 +473,7 @@ var FaceAnnotation = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.LocationInfo definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var LocationInfo = {
+const LocationInfo = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -493,7 +493,7 @@ var LocationInfo = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.Property definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var Property = {
+const Property = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -552,7 +552,7 @@ var Property = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.EntityAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var EntityAnnotation = {
+const EntityAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -597,7 +597,7 @@ var EntityAnnotation = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.SafeSearchAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var SafeSearchAnnotation = {
+const SafeSearchAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -618,7 +618,7 @@ var SafeSearchAnnotation = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.LatLongRect definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var LatLongRect = {
+const LatLongRect = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -642,7 +642,7 @@ var LatLongRect = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.ColorInfo definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var ColorInfo = {
+const ColorInfo = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -658,7 +658,7 @@ var ColorInfo = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.DominantColorsAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var DominantColorsAnnotation = {
+const DominantColorsAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -674,7 +674,7 @@ var DominantColorsAnnotation = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.ImageProperties definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var ImageProperties = {
+const ImageProperties = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -698,7 +698,7 @@ var ImageProperties = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.CropHint definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var CropHint = {
+const CropHint = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -714,7 +714,7 @@ var CropHint = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.CropHintsAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var CropHintsAnnotation = {
+const CropHintsAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -733,7 +733,7 @@ var CropHintsAnnotation = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.CropHintsParams definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var CropHintsParams = {
+const CropHintsParams = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -747,7 +747,7 @@ var CropHintsParams = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.WebDetectionParams definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var WebDetectionParams = {
+const WebDetectionParams = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -783,7 +783,7 @@ var WebDetectionParams = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.ImageContext definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var ImageContext = {
+const ImageContext = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -810,7 +810,7 @@ var ImageContext = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.AnnotateImageRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var AnnotateImageRequest = {
+const AnnotateImageRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -881,7 +881,7 @@ var AnnotateImageRequest = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.AnnotateImageResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var AnnotateImageResponse = {
+const AnnotateImageResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -897,7 +897,7 @@ var AnnotateImageResponse = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.BatchAnnotateImagesRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var BatchAnnotateImagesRequest = {
+const BatchAnnotateImagesRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -913,7 +913,7 @@ var BatchAnnotateImagesRequest = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.BatchAnnotateImagesResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/image_annotator.proto}
  */
-var BatchAnnotateImagesResponse = {
+const BatchAnnotateImagesResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -924,7 +924,7 @@ var BatchAnnotateImagesResponse = {
  * @enum {number}
  * @memberof google.cloud.vision.v1p1beta1
  */
-var Likelihood = {
+const Likelihood = {
 
   /**
    * Unknown likelihood.
diff --git a/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_text_annotation.js b/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_text_annotation.js
index 4934a62ec6e..2894cf650dd 100644
--- a/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_text_annotation.js
+++ b/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_text_annotation.js
@@ -37,7 +37,7 @@
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.TextAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/text_annotation.proto}
  */
-var TextAnnotation = {
+const TextAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -166,7 +166,7 @@ var TextAnnotation = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.Page definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/text_annotation.proto}
  */
-var Page = {
+const Page = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -214,7 +214,7 @@ var Page = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.Block definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/text_annotation.proto}
  */
-var Block = {
+const Block = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -296,7 +296,7 @@ var Block = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.Paragraph definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/text_annotation.proto}
  */
-var Paragraph = {
+const Paragraph = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -340,7 +340,7 @@ var Paragraph = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.Word definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/text_annotation.proto}
  */
-var Word = {
+const Word = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -381,6 +381,6 @@ var Word = {
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.Symbol definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/text_annotation.proto}
  */
-var Symbol = {
+const Symbol = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_web_detection.js b/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_web_detection.js
index 32de6c25da4..22dd4d7b7af 100644
--- a/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_web_detection.js
+++ b/packages/google-cloud-vision/src/v1p1beta1/doc/google/cloud/vision/v1p1beta1/doc_web_detection.js
@@ -55,7 +55,7 @@
  * @memberof google.cloud.vision.v1p1beta1
  * @see [google.cloud.vision.v1p1beta1.WebDetection definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p1beta1/web_detection.proto}
  */
-var WebDetection = {
+const WebDetection = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
diff --git a/packages/google-cloud-vision/src/v1p1beta1/doc/google/protobuf/doc_any.js b/packages/google-cloud-vision/src/v1p1beta1/doc/google/protobuf/doc_any.js
index c5c5bbafa23..3accb1fc0d8 100644
--- a/packages/google-cloud-vision/src/v1p1beta1/doc/google/protobuf/doc_any.js
+++ b/packages/google-cloud-vision/src/v1p1beta1/doc/google/protobuf/doc_any.js
@@ -131,6 +131,6 @@
  * @memberof google.protobuf
  * @see [google.protobuf.Any definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/any.proto}
  */
-var Any = {
+const Any = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p1beta1/doc/google/protobuf/doc_wrappers.js b/packages/google-cloud-vision/src/v1p1beta1/doc/google/protobuf/doc_wrappers.js
index 791b600ab1d..363b6391ac1 100644
--- a/packages/google-cloud-vision/src/v1p1beta1/doc/google/protobuf/doc_wrappers.js
+++ b/packages/google-cloud-vision/src/v1p1beta1/doc/google/protobuf/doc_wrappers.js
@@ -27,7 +27,7 @@
  * @memberof google.protobuf
  * @see [google.protobuf.DoubleValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var DoubleValue = {
+const DoubleValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -43,7 +43,7 @@ var DoubleValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.FloatValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var FloatValue = {
+const FloatValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -59,7 +59,7 @@ var FloatValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.Int64Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var Int64Value = {
+const Int64Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -75,7 +75,7 @@ var Int64Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.UInt64Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var UInt64Value = {
+const UInt64Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -91,7 +91,7 @@ var UInt64Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.Int32Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var Int32Value = {
+const Int32Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -107,7 +107,7 @@ var Int32Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.UInt32Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var UInt32Value = {
+const UInt32Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -123,7 +123,7 @@ var UInt32Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.BoolValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var BoolValue = {
+const BoolValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -139,7 +139,7 @@ var BoolValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.StringValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var StringValue = {
+const StringValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -155,6 +155,6 @@ var StringValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.BytesValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var BytesValue = {
+const BytesValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p1beta1/doc/google/rpc/doc_status.js b/packages/google-cloud-vision/src/v1p1beta1/doc/google/rpc/doc_status.js
index 7122f1682e0..13cfcab1021 100644
--- a/packages/google-cloud-vision/src/v1p1beta1/doc/google/rpc/doc_status.js
+++ b/packages/google-cloud-vision/src/v1p1beta1/doc/google/rpc/doc_status.js
@@ -87,6 +87,6 @@
  * @memberof google.rpc
  * @see [google.rpc.Status definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/rpc/status.proto}
  */
-var Status = {
+const Status = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p1beta1/doc/google/type/doc_color.js b/packages/google-cloud-vision/src/v1p1beta1/doc/google/type/doc_color.js
index 8ae80246fe3..c571f13c9a8 100644
--- a/packages/google-cloud-vision/src/v1p1beta1/doc/google/type/doc_color.js
+++ b/packages/google-cloud-vision/src/v1p1beta1/doc/google/type/doc_color.js
@@ -159,6 +159,6 @@
  * @memberof google.type
  * @see [google.type.Color definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/type/color.proto}
  */
-var Color = {
+const Color = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p1beta1/doc/google/type/doc_latlng.js b/packages/google-cloud-vision/src/v1p1beta1/doc/google/type/doc_latlng.js
index 76150dc3be1..abc54303752 100644
--- a/packages/google-cloud-vision/src/v1p1beta1/doc/google/type/doc_latlng.js
+++ b/packages/google-cloud-vision/src/v1p1beta1/doc/google/type/doc_latlng.js
@@ -66,6 +66,6 @@
  * @memberof google.type
  * @see [google.type.LatLng definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/type/latlng.proto}
  */
-var LatLng = {
+const LatLng = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p1beta1/image_annotator_client.js b/packages/google-cloud-vision/src/v1p1beta1/image_annotator_client.js
index 2af820fd776..865283c91bd 100644
--- a/packages/google-cloud-vision/src/v1p1beta1/image_annotator_client.js
+++ b/packages/google-cloud-vision/src/v1p1beta1/image_annotator_client.js
@@ -73,13 +73,13 @@ class ImageAnnotatorClient {
     // Create a `gaxGrpc` object, with any grpc-specific options
     // sent to the client.
     opts.scopes = this.constructor.scopes;
-    var gaxGrpc = new gax.GrpcClient(opts);
+    const gaxGrpc = new gax.GrpcClient(opts);
 
     // Save the auth object to the client, for use by other methods.
     this.auth = gaxGrpc.auth;
 
     // Determine the client header string.
-    var clientHeader = [
+    const clientHeader = [
       `gl-node/${process.version}`,
       `grpc/${gaxGrpc.grpcVersion}`,
       `gax/${gax.version}`,
@@ -90,7 +90,7 @@ class ImageAnnotatorClient {
     }
 
     // Load the applicable protos.
-    var protos = merge(
+    const protos = merge(
       {},
       gaxGrpc.loadProto(
         path.join(__dirname, '..', '..', 'protos'),
@@ -99,7 +99,7 @@ class ImageAnnotatorClient {
     );
 
     // Put together the default options sent with requests.
-    var defaults = gaxGrpc.constructSettings(
+    const defaults = gaxGrpc.constructSettings(
       'google.cloud.vision.v1p1beta1.ImageAnnotator',
       gapicConfig,
       opts.clientConfig,
@@ -113,20 +113,20 @@ class ImageAnnotatorClient {
 
     // Put together the "service stub" for
     // google.cloud.vision.v1p1beta1.ImageAnnotator.
-    var imageAnnotatorStub = gaxGrpc.createStub(
+    const imageAnnotatorStub = gaxGrpc.createStub(
       protos.google.cloud.vision.v1p1beta1.ImageAnnotator,
       opts
     );
 
     // Iterate over each of the methods that the service provides
     // and create an API call method for each.
-    var imageAnnotatorStubMethods = ['batchAnnotateImages'];
+    const imageAnnotatorStubMethods = ['batchAnnotateImages'];
     for (let methodName of imageAnnotatorStubMethods) {
       this._innerApiCalls[methodName] = gax.createApiCall(
         imageAnnotatorStub.then(
           stub =>
             function() {
-              var args = Array.prototype.slice.call(arguments, 0);
+              const args = Array.prototype.slice.call(arguments, 0);
               return stub[methodName].apply(stub, args);
             }
         ),
@@ -198,14 +198,14 @@ class ImageAnnotatorClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p1beta1.ImageAnnotatorClient({
+   * const client = new vision.v1p1beta1.ImageAnnotatorClient({
    *   // optional auth parameters.
    * });
    *
-   * var requests = [];
+   * const requests = [];
    * client.batchAnnotateImages({requests: requests})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
diff --git a/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_geometry.js b/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_geometry.js
index ad2bf6b27ca..c590b580c67 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_geometry.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_geometry.js
@@ -29,7 +29,7 @@
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.Vertex definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/geometry.proto}
  */
-var Vertex = {
+const Vertex = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -48,7 +48,7 @@ var Vertex = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.NormalizedVertex definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/geometry.proto}
  */
-var NormalizedVertex = {
+const NormalizedVertex = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -69,7 +69,7 @@ var NormalizedVertex = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.BoundingPoly definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/geometry.proto}
  */
-var BoundingPoly = {
+const BoundingPoly = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -91,6 +91,6 @@ var BoundingPoly = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.Position definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/geometry.proto}
  */
-var Position = {
+const Position = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_image_annotator.js b/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_image_annotator.js
index 8377294aa4a..7d3552be305 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_image_annotator.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_image_annotator.js
@@ -38,7 +38,7 @@
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.Feature definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var Feature = {
+const Feature = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -145,7 +145,7 @@ var Feature = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.ImageSource definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var ImageSource = {
+const ImageSource = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -168,7 +168,7 @@ var ImageSource = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.Image definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var Image = {
+const Image = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -260,7 +260,7 @@ var Image = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.FaceAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var FaceAnnotation = {
+const FaceAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -484,7 +484,7 @@ var FaceAnnotation = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.LocationInfo definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var LocationInfo = {
+const LocationInfo = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -504,7 +504,7 @@ var LocationInfo = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.Property definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var Property = {
+const Property = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -565,7 +565,7 @@ var Property = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.EntityAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var EntityAnnotation = {
+const EntityAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -610,7 +610,7 @@ var EntityAnnotation = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.SafeSearchAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var SafeSearchAnnotation = {
+const SafeSearchAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -631,7 +631,7 @@ var SafeSearchAnnotation = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.LatLongRect definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var LatLongRect = {
+const LatLongRect = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -655,7 +655,7 @@ var LatLongRect = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.ColorInfo definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var ColorInfo = {
+const ColorInfo = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -671,7 +671,7 @@ var ColorInfo = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.DominantColorsAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var DominantColorsAnnotation = {
+const DominantColorsAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -687,7 +687,7 @@ var DominantColorsAnnotation = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.ImageProperties definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var ImageProperties = {
+const ImageProperties = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -711,7 +711,7 @@ var ImageProperties = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.CropHint definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var CropHint = {
+const CropHint = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -727,7 +727,7 @@ var CropHint = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.CropHintsAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var CropHintsAnnotation = {
+const CropHintsAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -746,7 +746,7 @@ var CropHintsAnnotation = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.CropHintsParams definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var CropHintsParams = {
+const CropHintsParams = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -760,7 +760,7 @@ var CropHintsParams = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.WebDetectionParams definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var WebDetectionParams = {
+const WebDetectionParams = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -796,7 +796,7 @@ var WebDetectionParams = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.ImageContext definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var ImageContext = {
+const ImageContext = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -823,7 +823,7 @@ var ImageContext = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.AnnotateImageRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var AnnotateImageRequest = {
+const AnnotateImageRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -842,7 +842,7 @@ var AnnotateImageRequest = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.ImageAnnotationContext definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var ImageAnnotationContext = {
+const ImageAnnotationContext = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -919,7 +919,7 @@ var ImageAnnotationContext = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.AnnotateImageResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var AnnotateImageResponse = {
+const AnnotateImageResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -941,7 +941,7 @@ var AnnotateImageResponse = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.AnnotateFileResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var AnnotateFileResponse = {
+const AnnotateFileResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -957,7 +957,7 @@ var AnnotateFileResponse = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.BatchAnnotateImagesRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var BatchAnnotateImagesRequest = {
+const BatchAnnotateImagesRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -973,7 +973,7 @@ var BatchAnnotateImagesRequest = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.BatchAnnotateImagesResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var BatchAnnotateImagesResponse = {
+const BatchAnnotateImagesResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1004,7 +1004,7 @@ var BatchAnnotateImagesResponse = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.AsyncAnnotateFileRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var AsyncAnnotateFileRequest = {
+const AsyncAnnotateFileRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1020,7 +1020,7 @@ var AsyncAnnotateFileRequest = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.AsyncAnnotateFileResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var AsyncAnnotateFileResponse = {
+const AsyncAnnotateFileResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1037,7 +1037,7 @@ var AsyncAnnotateFileResponse = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.AsyncBatchAnnotateFilesRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var AsyncBatchAnnotateFilesRequest = {
+const AsyncBatchAnnotateFilesRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1054,7 +1054,7 @@ var AsyncBatchAnnotateFilesRequest = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.AsyncBatchAnnotateFilesResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var AsyncBatchAnnotateFilesResponse = {
+const AsyncBatchAnnotateFilesResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1074,7 +1074,7 @@ var AsyncBatchAnnotateFilesResponse = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.InputConfig definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var InputConfig = {
+const InputConfig = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1102,7 +1102,7 @@ var InputConfig = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.OutputConfig definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var OutputConfig = {
+const OutputConfig = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1117,7 +1117,7 @@ var OutputConfig = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.GcsSource definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var GcsSource = {
+const GcsSource = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1145,7 +1145,7 @@ var GcsSource = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.GcsDestination definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var GcsDestination = {
+const GcsDestination = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1171,7 +1171,7 @@ var GcsDestination = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.OperationMetadata definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/image_annotator.proto}
  */
-var OperationMetadata = {
+const OperationMetadata = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -1216,7 +1216,7 @@ var OperationMetadata = {
  * @enum {number}
  * @memberof google.cloud.vision.v1p2beta1
  */
-var Likelihood = {
+const Likelihood = {
 
   /**
    * Unknown likelihood.
diff --git a/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_text_annotation.js b/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_text_annotation.js
index 5c7c80b6f3b..79ecb1f06aa 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_text_annotation.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_text_annotation.js
@@ -36,7 +36,7 @@
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.TextAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/text_annotation.proto}
  */
-var TextAnnotation = {
+const TextAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -167,7 +167,7 @@ var TextAnnotation = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.Page definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/text_annotation.proto}
  */
-var Page = {
+const Page = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -220,7 +220,7 @@ var Page = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.Block definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/text_annotation.proto}
  */
-var Block = {
+const Block = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -302,7 +302,7 @@ var Block = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.Paragraph definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/text_annotation.proto}
  */
-var Paragraph = {
+const Paragraph = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -346,7 +346,7 @@ var Paragraph = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.Word definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/text_annotation.proto}
  */
-var Word = {
+const Word = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -387,6 +387,6 @@ var Word = {
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.Symbol definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/text_annotation.proto}
  */
-var Symbol = {
+const Symbol = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_web_detection.js b/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_web_detection.js
index ba972c7602c..7389d72d765 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_web_detection.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/doc/google/cloud/vision/v1p2beta1/doc_web_detection.js
@@ -55,7 +55,7 @@
  * @memberof google.cloud.vision.v1p2beta1
  * @see [google.cloud.vision.v1p2beta1.WebDetection definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p2beta1/web_detection.proto}
  */
-var WebDetection = {
+const WebDetection = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
diff --git a/packages/google-cloud-vision/src/v1p2beta1/doc/google/longrunning/doc_operations.js b/packages/google-cloud-vision/src/v1p2beta1/doc/google/longrunning/doc_operations.js
index 79ef6344437..4af5d7d3574 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/doc/google/longrunning/doc_operations.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/doc/google/longrunning/doc_operations.js
@@ -58,7 +58,7 @@
  * @memberof google.longrunning
  * @see [google.longrunning.Operation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var Operation = {
+const Operation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -72,7 +72,7 @@ var Operation = {
  * @memberof google.longrunning
  * @see [google.longrunning.GetOperationRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var GetOperationRequest = {
+const GetOperationRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -95,7 +95,7 @@ var GetOperationRequest = {
  * @memberof google.longrunning
  * @see [google.longrunning.ListOperationsRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var ListOperationsRequest = {
+const ListOperationsRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -114,7 +114,7 @@ var ListOperationsRequest = {
  * @memberof google.longrunning
  * @see [google.longrunning.ListOperationsResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var ListOperationsResponse = {
+const ListOperationsResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -128,7 +128,7 @@ var ListOperationsResponse = {
  * @memberof google.longrunning
  * @see [google.longrunning.CancelOperationRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var CancelOperationRequest = {
+const CancelOperationRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -142,6 +142,6 @@ var CancelOperationRequest = {
  * @memberof google.longrunning
  * @see [google.longrunning.DeleteOperationRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var DeleteOperationRequest = {
+const DeleteOperationRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p2beta1/doc/google/protobuf/doc_any.js b/packages/google-cloud-vision/src/v1p2beta1/doc/google/protobuf/doc_any.js
index c5c5bbafa23..3accb1fc0d8 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/doc/google/protobuf/doc_any.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/doc/google/protobuf/doc_any.js
@@ -131,6 +131,6 @@
  * @memberof google.protobuf
  * @see [google.protobuf.Any definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/any.proto}
  */
-var Any = {
+const Any = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p2beta1/doc/google/protobuf/doc_wrappers.js b/packages/google-cloud-vision/src/v1p2beta1/doc/google/protobuf/doc_wrappers.js
index 791b600ab1d..363b6391ac1 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/doc/google/protobuf/doc_wrappers.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/doc/google/protobuf/doc_wrappers.js
@@ -27,7 +27,7 @@
  * @memberof google.protobuf
  * @see [google.protobuf.DoubleValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var DoubleValue = {
+const DoubleValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -43,7 +43,7 @@ var DoubleValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.FloatValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var FloatValue = {
+const FloatValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -59,7 +59,7 @@ var FloatValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.Int64Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var Int64Value = {
+const Int64Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -75,7 +75,7 @@ var Int64Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.UInt64Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var UInt64Value = {
+const UInt64Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -91,7 +91,7 @@ var UInt64Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.Int32Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var Int32Value = {
+const Int32Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -107,7 +107,7 @@ var Int32Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.UInt32Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var UInt32Value = {
+const UInt32Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -123,7 +123,7 @@ var UInt32Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.BoolValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var BoolValue = {
+const BoolValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -139,7 +139,7 @@ var BoolValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.StringValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var StringValue = {
+const StringValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -155,6 +155,6 @@ var StringValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.BytesValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var BytesValue = {
+const BytesValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p2beta1/doc/google/rpc/doc_status.js b/packages/google-cloud-vision/src/v1p2beta1/doc/google/rpc/doc_status.js
index 7122f1682e0..13cfcab1021 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/doc/google/rpc/doc_status.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/doc/google/rpc/doc_status.js
@@ -87,6 +87,6 @@
  * @memberof google.rpc
  * @see [google.rpc.Status definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/rpc/status.proto}
  */
-var Status = {
+const Status = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p2beta1/doc/google/type/doc_color.js b/packages/google-cloud-vision/src/v1p2beta1/doc/google/type/doc_color.js
index 8ae80246fe3..c571f13c9a8 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/doc/google/type/doc_color.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/doc/google/type/doc_color.js
@@ -159,6 +159,6 @@
  * @memberof google.type
  * @see [google.type.Color definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/type/color.proto}
  */
-var Color = {
+const Color = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p2beta1/doc/google/type/doc_latlng.js b/packages/google-cloud-vision/src/v1p2beta1/doc/google/type/doc_latlng.js
index 76150dc3be1..abc54303752 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/doc/google/type/doc_latlng.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/doc/google/type/doc_latlng.js
@@ -66,6 +66,6 @@
  * @memberof google.type
  * @see [google.type.LatLng definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/type/latlng.proto}
  */
-var LatLng = {
+const LatLng = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p2beta1/image_annotator_client.js b/packages/google-cloud-vision/src/v1p2beta1/image_annotator_client.js
index 00a1236df3b..3bea2b0ae5f 100644
--- a/packages/google-cloud-vision/src/v1p2beta1/image_annotator_client.js
+++ b/packages/google-cloud-vision/src/v1p2beta1/image_annotator_client.js
@@ -74,13 +74,13 @@ class ImageAnnotatorClient {
     // Create a `gaxGrpc` object, with any grpc-specific options
     // sent to the client.
     opts.scopes = this.constructor.scopes;
-    var gaxGrpc = new gax.GrpcClient(opts);
+    const gaxGrpc = new gax.GrpcClient(opts);
 
     // Save the auth object to the client, for use by other methods.
     this.auth = gaxGrpc.auth;
 
     // Determine the client header string.
-    var clientHeader = [
+    const clientHeader = [
       `gl-node/${process.version}`,
       `grpc/${gaxGrpc.grpcVersion}`,
       `gax/${gax.version}`,
@@ -91,14 +91,14 @@ class ImageAnnotatorClient {
     }
 
     // Load the applicable protos.
-    var protos = merge(
+    const protos = merge(
       {},
       gaxGrpc.loadProto(
         path.join(__dirname, '..', '..', 'protos'),
         'google/cloud/vision/v1p2beta1/image_annotator.proto'
       )
     );
-    var protoFilesRoot = new gax.GoogleProtoFilesRoot();
+    let protoFilesRoot = new gax.GoogleProtoFilesRoot();
     protoFilesRoot = protobuf.loadSync(
       path.join(
         __dirname,
@@ -118,10 +118,10 @@ class ImageAnnotatorClient {
       grpc: gaxGrpc.grpc,
     }).operationsClient(opts);
 
-    var asyncBatchAnnotateFilesResponse = protoFilesRoot.lookup(
+    const asyncBatchAnnotateFilesResponse = protoFilesRoot.lookup(
       'google.cloud.vision.v1p2beta1.AsyncBatchAnnotateFilesResponse'
     );
-    var asyncBatchAnnotateFilesMetadata = protoFilesRoot.lookup(
+    const asyncBatchAnnotateFilesMetadata = protoFilesRoot.lookup(
       'google.cloud.vision.v1p2beta1.OperationMetadata'
     );
 
@@ -138,7 +138,7 @@ class ImageAnnotatorClient {
     };
 
     // Put together the default options sent with requests.
-    var defaults = gaxGrpc.constructSettings(
+    const defaults = gaxGrpc.constructSettings(
       'google.cloud.vision.v1p2beta1.ImageAnnotator',
       gapicConfig,
       opts.clientConfig,
@@ -152,14 +152,14 @@ class ImageAnnotatorClient {
 
     // Put together the "service stub" for
     // google.cloud.vision.v1p2beta1.ImageAnnotator.
-    var imageAnnotatorStub = gaxGrpc.createStub(
+    const imageAnnotatorStub = gaxGrpc.createStub(
       protos.google.cloud.vision.v1p2beta1.ImageAnnotator,
       opts
     );
 
     // Iterate over each of the methods that the service provides
     // and create an API call method for each.
-    var imageAnnotatorStubMethods = [
+    const imageAnnotatorStubMethods = [
       'batchAnnotateImages',
       'asyncBatchAnnotateFiles',
     ];
@@ -168,7 +168,7 @@ class ImageAnnotatorClient {
         imageAnnotatorStub.then(
           stub =>
             function() {
-              var args = Array.prototype.slice.call(arguments, 0);
+              const args = Array.prototype.slice.call(arguments, 0);
               return stub[methodName].apply(stub, args);
             }
         ),
@@ -240,14 +240,14 @@ class ImageAnnotatorClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p2beta1.ImageAnnotatorClient({
+   * const client = new vision.v1p2beta1.ImageAnnotatorClient({
    *   // optional auth parameters.
    * });
    *
-   * var requests = [];
+   * const requests = [];
    * client.batchAnnotateImages({requests: requests})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -293,42 +293,42 @@ class ImageAnnotatorClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p2beta1.ImageAnnotatorClient({
+   * const client = new vision.v1p2beta1.ImageAnnotatorClient({
    *   // optional auth parameters.
    * });
    *
-   * var requests = [];
+   * const requests = [];
    *
    * // Handle the operation using the promise pattern.
    * client.asyncBatchAnnotateFiles({requests: requests})
    *   .then(responses => {
-   *     var operation = responses[0];
-   *     var initialApiResponse = responses[1];
+   *     const operation = responses[0];
+   *     const initialApiResponse = responses[1];
    *
    *     // Operation#promise starts polling for the completion of the LRO.
    *     return operation.promise();
    *   })
    *   .then(responses => {
    *     // The final result of the operation.
-   *     var result = responses[0];
+   *     const result = responses[0];
    *
    *     // The metadata value of the completed operation.
-   *     var metadata = responses[1];
+   *     const metadata = responses[1];
    *
    *     // The response of the api call returning the complete operation.
-   *     var finalApiResponse = responses[2];
+   *     const finalApiResponse = responses[2];
    *   })
    *   .catch(err => {
    *     console.error(err);
    *   });
    *
-   * var requests = [];
+   * const requests = [];
    *
    * // Handle the operation using the event emitter pattern.
    * client.asyncBatchAnnotateFiles({requests: requests})
    *   .then(responses => {
-   *     var operation = responses[0];
-   *     var initialApiResponse = responses[1];
+   *     const operation = responses[0];
+   *     const initialApiResponse = responses[1];
    *
    *     // Adding a listener for the "complete" event starts polling for the
    *     // completion of the operation.
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_geometry.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_geometry.js
index d71d4054d1b..b1b212e1eb8 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_geometry.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_geometry.js
@@ -29,7 +29,7 @@
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Vertex definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/geometry.proto}
  */
-var Vertex = {
+const Vertex = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -48,7 +48,7 @@ var Vertex = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.NormalizedVertex definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/geometry.proto}
  */
-var NormalizedVertex = {
+const NormalizedVertex = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -69,7 +69,7 @@ var NormalizedVertex = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.BoundingPoly definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/geometry.proto}
  */
-var BoundingPoly = {
+const BoundingPoly = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -85,7 +85,7 @@ var BoundingPoly = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.NormalizedBoundingPoly definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/geometry.proto}
  */
-var NormalizedBoundingPoly = {
+const NormalizedBoundingPoly = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -107,6 +107,6 @@ var NormalizedBoundingPoly = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Position definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/geometry.proto}
  */
-var Position = {
+const Position = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_image_annotator.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_image_annotator.js
index 2a119fb46ec..06ec045d102 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_image_annotator.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_image_annotator.js
@@ -38,7 +38,7 @@
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Feature definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var Feature = {
+const Feature = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -155,7 +155,7 @@ var Feature = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ImageSource definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var ImageSource = {
+const ImageSource = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -178,7 +178,7 @@ var ImageSource = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Image definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var Image = {
+const Image = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -270,7 +270,7 @@ var Image = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.FaceAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var FaceAnnotation = {
+const FaceAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -494,7 +494,7 @@ var FaceAnnotation = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.LocationInfo definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var LocationInfo = {
+const LocationInfo = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -514,7 +514,7 @@ var LocationInfo = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Property definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var Property = {
+const Property = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -575,7 +575,7 @@ var Property = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.EntityAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var EntityAnnotation = {
+const EntityAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -605,7 +605,7 @@ var EntityAnnotation = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.LocalizedObjectAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var LocalizedObjectAnnotation = {
+const LocalizedObjectAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -650,7 +650,7 @@ var LocalizedObjectAnnotation = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.SafeSearchAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var SafeSearchAnnotation = {
+const SafeSearchAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -671,7 +671,7 @@ var SafeSearchAnnotation = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.LatLongRect definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var LatLongRect = {
+const LatLongRect = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -695,7 +695,7 @@ var LatLongRect = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ColorInfo definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var ColorInfo = {
+const ColorInfo = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -711,7 +711,7 @@ var ColorInfo = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.DominantColorsAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var DominantColorsAnnotation = {
+const DominantColorsAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -727,7 +727,7 @@ var DominantColorsAnnotation = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ImageProperties definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var ImageProperties = {
+const ImageProperties = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -751,7 +751,7 @@ var ImageProperties = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.CropHint definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var CropHint = {
+const CropHint = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -767,7 +767,7 @@ var CropHint = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.CropHintsAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var CropHintsAnnotation = {
+const CropHintsAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -786,7 +786,7 @@ var CropHintsAnnotation = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.CropHintsParams definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var CropHintsParams = {
+const CropHintsParams = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -800,7 +800,7 @@ var CropHintsParams = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.WebDetectionParams definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var WebDetectionParams = {
+const WebDetectionParams = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -841,7 +841,7 @@ var WebDetectionParams = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ImageContext definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var ImageContext = {
+const ImageContext = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -868,7 +868,7 @@ var ImageContext = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.AnnotateImageRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var AnnotateImageRequest = {
+const AnnotateImageRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -887,7 +887,7 @@ var AnnotateImageRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ImageAnnotationContext definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var ImageAnnotationContext = {
+const ImageAnnotationContext = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -975,7 +975,7 @@ var ImageAnnotationContext = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.AnnotateImageResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var AnnotateImageResponse = {
+const AnnotateImageResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -997,7 +997,7 @@ var AnnotateImageResponse = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.AnnotateFileResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var AnnotateFileResponse = {
+const AnnotateFileResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1013,7 +1013,7 @@ var AnnotateFileResponse = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.BatchAnnotateImagesRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var BatchAnnotateImagesRequest = {
+const BatchAnnotateImagesRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1029,7 +1029,7 @@ var BatchAnnotateImagesRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.BatchAnnotateImagesResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var BatchAnnotateImagesResponse = {
+const BatchAnnotateImagesResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1060,7 +1060,7 @@ var BatchAnnotateImagesResponse = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.AsyncAnnotateFileRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var AsyncAnnotateFileRequest = {
+const AsyncAnnotateFileRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1076,7 +1076,7 @@ var AsyncAnnotateFileRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.AsyncAnnotateFileResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var AsyncAnnotateFileResponse = {
+const AsyncAnnotateFileResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1093,7 +1093,7 @@ var AsyncAnnotateFileResponse = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.AsyncBatchAnnotateFilesRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var AsyncBatchAnnotateFilesRequest = {
+const AsyncBatchAnnotateFilesRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1110,7 +1110,7 @@ var AsyncBatchAnnotateFilesRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.AsyncBatchAnnotateFilesResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var AsyncBatchAnnotateFilesResponse = {
+const AsyncBatchAnnotateFilesResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1130,7 +1130,7 @@ var AsyncBatchAnnotateFilesResponse = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.InputConfig definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var InputConfig = {
+const InputConfig = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1159,7 +1159,7 @@ var InputConfig = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.OutputConfig definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var OutputConfig = {
+const OutputConfig = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1174,7 +1174,7 @@ var OutputConfig = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.GcsSource definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var GcsSource = {
+const GcsSource = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1202,7 +1202,7 @@ var GcsSource = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.GcsDestination definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var GcsDestination = {
+const GcsDestination = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -1228,7 +1228,7 @@ var GcsDestination = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.OperationMetadata definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/image_annotator.proto}
  */
-var OperationMetadata = {
+const OperationMetadata = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -1273,7 +1273,7 @@ var OperationMetadata = {
  * @enum {number}
  * @memberof google.cloud.vision.v1p3beta1
  */
-var Likelihood = {
+const Likelihood = {
 
   /**
    * Unknown likelihood.
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_product_search.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_product_search.js
index edfc470507b..e8df1deaee9 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_product_search.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_product_search.js
@@ -78,7 +78,7 @@
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ProductSearchParams definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search.proto}
  */
-var ProductSearchParams = {
+const ProductSearchParams = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -116,7 +116,7 @@ var ProductSearchParams = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ProductSearchResults definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search.proto}
  */
-var ProductSearchResults = {
+const ProductSearchResults = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -180,7 +180,7 @@ var ProductSearchResults = {
  * @enum {number}
  * @memberof google.cloud.vision.v1p3beta1
  */
-var ProductSearchCategory = {
+const ProductSearchCategory = {
 
   /**
    * Default value used when a category is not specified.
@@ -204,7 +204,7 @@ var ProductSearchCategory = {
  * @enum {number}
  * @memberof google.cloud.vision.v1p3beta1
  */
-var ProductSearchResultsView = {
+const ProductSearchResultsView = {
 
   /**
    * Product search results contain only `product_category` and `product_id`.
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_product_search_service.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_product_search_service.js
index e4a3df680e8..cc20ed58d19 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_product_search_service.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_product_search_service.js
@@ -57,7 +57,7 @@
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Product definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var Product = {
+const Product = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -118,7 +118,7 @@ var Product = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ProductSet definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ProductSet = {
+const ProductSet = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -158,7 +158,7 @@ var ProductSet = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ReferenceImage definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ReferenceImage = {
+const ReferenceImage = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -186,7 +186,7 @@ var ReferenceImage = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.CreateProductRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var CreateProductRequest = {
+const CreateProductRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -209,7 +209,7 @@ var CreateProductRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ListProductsRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ListProductsRequest = {
+const ListProductsRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -229,7 +229,7 @@ var ListProductsRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ListProductsResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ListProductsResponse = {
+const ListProductsResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -246,7 +246,7 @@ var ListProductsResponse = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.GetProductRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var GetProductRequest = {
+const GetProductRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -272,7 +272,7 @@ var GetProductRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.UpdateProductRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var UpdateProductRequest = {
+const UpdateProductRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -289,7 +289,7 @@ var UpdateProductRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.DeleteProductRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var DeleteProductRequest = {
+const DeleteProductRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -316,7 +316,7 @@ var DeleteProductRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.CreateProductSetRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var CreateProductSetRequest = {
+const CreateProductSetRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -338,7 +338,7 @@ var CreateProductSetRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ListProductSetsRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ListProductSetsRequest = {
+const ListProductSetsRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -358,7 +358,7 @@ var ListProductSetsRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ListProductSetsResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ListProductSetsResponse = {
+const ListProductSetsResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -375,7 +375,7 @@ var ListProductSetsResponse = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.GetProductSetRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var GetProductSetRequest = {
+const GetProductSetRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -399,7 +399,7 @@ var GetProductSetRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.UpdateProductSetRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var UpdateProductSetRequest = {
+const UpdateProductSetRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -416,7 +416,7 @@ var UpdateProductSetRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.DeleteProductSetRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var DeleteProductSetRequest = {
+const DeleteProductSetRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -445,7 +445,7 @@ var DeleteProductSetRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.CreateReferenceImageRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var CreateReferenceImageRequest = {
+const CreateReferenceImageRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -471,7 +471,7 @@ var CreateReferenceImageRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ListReferenceImagesRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ListReferenceImagesRequest = {
+const ListReferenceImagesRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -493,7 +493,7 @@ var ListReferenceImagesRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ListReferenceImagesResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ListReferenceImagesResponse = {
+const ListReferenceImagesResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -511,7 +511,7 @@ var ListReferenceImagesResponse = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.GetReferenceImageRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var GetReferenceImageRequest = {
+const GetReferenceImageRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -529,7 +529,7 @@ var GetReferenceImageRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.DeleteReferenceImageRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var DeleteReferenceImageRequest = {
+const DeleteReferenceImageRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -552,7 +552,7 @@ var DeleteReferenceImageRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.AddProductToProductSetRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var AddProductToProductSetRequest = {
+const AddProductToProductSetRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -575,7 +575,7 @@ var AddProductToProductSetRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.RemoveProductFromProductSetRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var RemoveProductFromProductSetRequest = {
+const RemoveProductFromProductSetRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -598,7 +598,7 @@ var RemoveProductFromProductSetRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ListProductsInProductSetRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ListProductsInProductSetRequest = {
+const ListProductsInProductSetRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -618,7 +618,7 @@ var ListProductsInProductSetRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ListProductsInProductSetResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ListProductsInProductSetResponse = {
+const ListProductsInProductSetResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -687,7 +687,7 @@ var ListProductsInProductSetResponse = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ImportProductSetsGcsSource definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ImportProductSetsGcsSource = {
+const ImportProductSetsGcsSource = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -704,7 +704,7 @@ var ImportProductSetsGcsSource = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ImportProductSetsInputConfig definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ImportProductSetsInputConfig = {
+const ImportProductSetsInputConfig = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -725,7 +725,7 @@ var ImportProductSetsInputConfig = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ImportProductSetsRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ImportProductSetsRequest = {
+const ImportProductSetsRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -755,7 +755,7 @@ var ImportProductSetsRequest = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.ImportProductSetsResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var ImportProductSetsResponse = {
+const ImportProductSetsResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -785,7 +785,7 @@ var ImportProductSetsResponse = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.BatchOperationMetadata definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/product_search_service.proto}
  */
-var BatchOperationMetadata = {
+const BatchOperationMetadata = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_text_annotation.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_text_annotation.js
index da54f338c73..665b303be9a 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_text_annotation.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_text_annotation.js
@@ -36,7 +36,7 @@
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.TextAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/text_annotation.proto}
  */
-var TextAnnotation = {
+const TextAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -167,7 +167,7 @@ var TextAnnotation = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Page definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/text_annotation.proto}
  */
-var Page = {
+const Page = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -220,7 +220,7 @@ var Page = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Block definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/text_annotation.proto}
  */
-var Block = {
+const Block = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -302,7 +302,7 @@ var Block = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Paragraph definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/text_annotation.proto}
  */
-var Paragraph = {
+const Paragraph = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -346,7 +346,7 @@ var Paragraph = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Word definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/text_annotation.proto}
  */
-var Word = {
+const Word = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -387,6 +387,6 @@ var Word = {
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.Symbol definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/text_annotation.proto}
  */
-var Symbol = {
+const Symbol = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_web_detection.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_web_detection.js
index eec0727e29b..bfc76d1f9ab 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_web_detection.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/cloud/vision/v1p3beta1/doc_web_detection.js
@@ -55,7 +55,7 @@
  * @memberof google.cloud.vision.v1p3beta1
  * @see [google.cloud.vision.v1p3beta1.WebDetection definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/vision/v1p3beta1/web_detection.proto}
  */
-var WebDetection = {
+const WebDetection = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/longrunning/doc_operations.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/longrunning/doc_operations.js
index 79ef6344437..4af5d7d3574 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/longrunning/doc_operations.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/longrunning/doc_operations.js
@@ -58,7 +58,7 @@
  * @memberof google.longrunning
  * @see [google.longrunning.Operation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var Operation = {
+const Operation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -72,7 +72,7 @@ var Operation = {
  * @memberof google.longrunning
  * @see [google.longrunning.GetOperationRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var GetOperationRequest = {
+const GetOperationRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -95,7 +95,7 @@ var GetOperationRequest = {
  * @memberof google.longrunning
  * @see [google.longrunning.ListOperationsRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var ListOperationsRequest = {
+const ListOperationsRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -114,7 +114,7 @@ var ListOperationsRequest = {
  * @memberof google.longrunning
  * @see [google.longrunning.ListOperationsResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var ListOperationsResponse = {
+const ListOperationsResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -128,7 +128,7 @@ var ListOperationsResponse = {
  * @memberof google.longrunning
  * @see [google.longrunning.CancelOperationRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var CancelOperationRequest = {
+const CancelOperationRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -142,6 +142,6 @@ var CancelOperationRequest = {
  * @memberof google.longrunning
  * @see [google.longrunning.DeleteOperationRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/longrunning/operations.proto}
  */
-var DeleteOperationRequest = {
+const DeleteOperationRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_any.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_any.js
index c5c5bbafa23..3accb1fc0d8 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_any.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_any.js
@@ -131,6 +131,6 @@
  * @memberof google.protobuf
  * @see [google.protobuf.Any definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/any.proto}
  */
-var Any = {
+const Any = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_empty.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_empty.js
index 5e3640e90d8..b1d6b5e32a9 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_empty.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_empty.js
@@ -29,6 +29,6 @@
  * @memberof google.protobuf
  * @see [google.protobuf.Empty definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/empty.proto}
  */
-var Empty = {
+const Empty = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_field_mask.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_field_mask.js
index d700752b7c6..0cb35328962 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_field_mask.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_field_mask.js
@@ -231,6 +231,6 @@
  * @memberof google.protobuf
  * @see [google.protobuf.FieldMask definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/field_mask.proto}
  */
-var FieldMask = {
+const FieldMask = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_timestamp.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_timestamp.js
index 51d8f40f54d..1ebe2e6e1a5 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_timestamp.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_timestamp.js
@@ -110,6 +110,6 @@
  * @memberof google.protobuf
  * @see [google.protobuf.Timestamp definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/timestamp.proto}
  */
-var Timestamp = {
+const Timestamp = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_wrappers.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_wrappers.js
index 791b600ab1d..363b6391ac1 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_wrappers.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/protobuf/doc_wrappers.js
@@ -27,7 +27,7 @@
  * @memberof google.protobuf
  * @see [google.protobuf.DoubleValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var DoubleValue = {
+const DoubleValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -43,7 +43,7 @@ var DoubleValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.FloatValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var FloatValue = {
+const FloatValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -59,7 +59,7 @@ var FloatValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.Int64Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var Int64Value = {
+const Int64Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -75,7 +75,7 @@ var Int64Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.UInt64Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var UInt64Value = {
+const UInt64Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -91,7 +91,7 @@ var UInt64Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.Int32Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var Int32Value = {
+const Int32Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -107,7 +107,7 @@ var Int32Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.UInt32Value definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var UInt32Value = {
+const UInt32Value = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -123,7 +123,7 @@ var UInt32Value = {
  * @memberof google.protobuf
  * @see [google.protobuf.BoolValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var BoolValue = {
+const BoolValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -139,7 +139,7 @@ var BoolValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.StringValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var StringValue = {
+const StringValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -155,6 +155,6 @@ var StringValue = {
  * @memberof google.protobuf
  * @see [google.protobuf.BytesValue definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto}
  */
-var BytesValue = {
+const BytesValue = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/rpc/doc_status.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/rpc/doc_status.js
index 7122f1682e0..13cfcab1021 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/rpc/doc_status.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/rpc/doc_status.js
@@ -87,6 +87,6 @@
  * @memberof google.rpc
  * @see [google.rpc.Status definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/rpc/status.proto}
  */
-var Status = {
+const Status = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/type/doc_color.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/type/doc_color.js
index 8ae80246fe3..c571f13c9a8 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/type/doc_color.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/type/doc_color.js
@@ -159,6 +159,6 @@
  * @memberof google.type
  * @see [google.type.Color definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/type/color.proto}
  */
-var Color = {
+const Color = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/doc/google/type/doc_latlng.js b/packages/google-cloud-vision/src/v1p3beta1/doc/google/type/doc_latlng.js
index 76150dc3be1..abc54303752 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/doc/google/type/doc_latlng.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/doc/google/type/doc_latlng.js
@@ -66,6 +66,6 @@
  * @memberof google.type
  * @see [google.type.LatLng definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/type/latlng.proto}
  */
-var LatLng = {
+const LatLng = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-vision/src/v1p3beta1/image_annotator_client.js b/packages/google-cloud-vision/src/v1p3beta1/image_annotator_client.js
index 38c904bef91..8370a95611c 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/image_annotator_client.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/image_annotator_client.js
@@ -74,13 +74,13 @@ class ImageAnnotatorClient {
     // Create a `gaxGrpc` object, with any grpc-specific options
     // sent to the client.
     opts.scopes = this.constructor.scopes;
-    var gaxGrpc = new gax.GrpcClient(opts);
+    const gaxGrpc = new gax.GrpcClient(opts);
 
     // Save the auth object to the client, for use by other methods.
     this.auth = gaxGrpc.auth;
 
     // Determine the client header string.
-    var clientHeader = [
+    const clientHeader = [
       `gl-node/${process.version}`,
       `grpc/${gaxGrpc.grpcVersion}`,
       `gax/${gax.version}`,
@@ -91,14 +91,14 @@ class ImageAnnotatorClient {
     }
 
     // Load the applicable protos.
-    var protos = merge(
+    const protos = merge(
       {},
       gaxGrpc.loadProto(
         path.join(__dirname, '..', '..', 'protos'),
         'google/cloud/vision/v1p3beta1/image_annotator.proto'
       )
     );
-    var protoFilesRoot = new gax.GoogleProtoFilesRoot();
+    let protoFilesRoot = new gax.GoogleProtoFilesRoot();
     protoFilesRoot = protobuf.loadSync(
       path.join(
         __dirname,
@@ -118,10 +118,10 @@ class ImageAnnotatorClient {
       grpc: gaxGrpc.grpc,
     }).operationsClient(opts);
 
-    var asyncBatchAnnotateFilesResponse = protoFilesRoot.lookup(
+    const asyncBatchAnnotateFilesResponse = protoFilesRoot.lookup(
       'google.cloud.vision.v1p3beta1.AsyncBatchAnnotateFilesResponse'
     );
-    var asyncBatchAnnotateFilesMetadata = protoFilesRoot.lookup(
+    const asyncBatchAnnotateFilesMetadata = protoFilesRoot.lookup(
       'google.cloud.vision.v1p3beta1.OperationMetadata'
     );
 
@@ -138,7 +138,7 @@ class ImageAnnotatorClient {
     };
 
     // Put together the default options sent with requests.
-    var defaults = gaxGrpc.constructSettings(
+    const defaults = gaxGrpc.constructSettings(
       'google.cloud.vision.v1p3beta1.ImageAnnotator',
       gapicConfig,
       opts.clientConfig,
@@ -152,14 +152,14 @@ class ImageAnnotatorClient {
 
     // Put together the "service stub" for
     // google.cloud.vision.v1p3beta1.ImageAnnotator.
-    var imageAnnotatorStub = gaxGrpc.createStub(
+    const imageAnnotatorStub = gaxGrpc.createStub(
       protos.google.cloud.vision.v1p3beta1.ImageAnnotator,
       opts
     );
 
     // Iterate over each of the methods that the service provides
     // and create an API call method for each.
-    var imageAnnotatorStubMethods = [
+    const imageAnnotatorStubMethods = [
       'batchAnnotateImages',
       'asyncBatchAnnotateFiles',
     ];
@@ -168,7 +168,7 @@ class ImageAnnotatorClient {
         imageAnnotatorStub.then(
           stub =>
             function() {
-              var args = Array.prototype.slice.call(arguments, 0);
+              const args = Array.prototype.slice.call(arguments, 0);
               return stub[methodName].apply(stub, args);
             }
         ),
@@ -240,14 +240,14 @@ class ImageAnnotatorClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ImageAnnotatorClient({
+   * const client = new vision.v1p3beta1.ImageAnnotatorClient({
    *   // optional auth parameters.
    * });
    *
-   * var requests = [];
+   * const requests = [];
    * client.batchAnnotateImages({requests: requests})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -293,42 +293,42 @@ class ImageAnnotatorClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ImageAnnotatorClient({
+   * const client = new vision.v1p3beta1.ImageAnnotatorClient({
    *   // optional auth parameters.
    * });
    *
-   * var requests = [];
+   * const requests = [];
    *
    * // Handle the operation using the promise pattern.
    * client.asyncBatchAnnotateFiles({requests: requests})
    *   .then(responses => {
-   *     var operation = responses[0];
-   *     var initialApiResponse = responses[1];
+   *     const operation = responses[0];
+   *     const initialApiResponse = responses[1];
    *
    *     // Operation#promise starts polling for the completion of the LRO.
    *     return operation.promise();
    *   })
    *   .then(responses => {
    *     // The final result of the operation.
-   *     var result = responses[0];
+   *     const result = responses[0];
    *
    *     // The metadata value of the completed operation.
-   *     var metadata = responses[1];
+   *     const metadata = responses[1];
    *
    *     // The response of the api call returning the complete operation.
-   *     var finalApiResponse = responses[2];
+   *     const finalApiResponse = responses[2];
    *   })
    *   .catch(err => {
    *     console.error(err);
    *   });
    *
-   * var requests = [];
+   * const requests = [];
    *
    * // Handle the operation using the event emitter pattern.
    * client.asyncBatchAnnotateFiles({requests: requests})
    *   .then(responses => {
-   *     var operation = responses[0];
-   *     var initialApiResponse = responses[1];
+   *     const operation = responses[0];
+   *     const initialApiResponse = responses[1];
    *
    *     // Adding a listener for the "complete" event starts polling for the
    *     // completion of the operation.
diff --git a/packages/google-cloud-vision/src/v1p3beta1/product_search_client.js b/packages/google-cloud-vision/src/v1p3beta1/product_search_client.js
index 3f4def02a25..789395b186e 100644
--- a/packages/google-cloud-vision/src/v1p3beta1/product_search_client.js
+++ b/packages/google-cloud-vision/src/v1p3beta1/product_search_client.js
@@ -85,13 +85,13 @@ class ProductSearchClient {
     // Create a `gaxGrpc` object, with any grpc-specific options
     // sent to the client.
     opts.scopes = this.constructor.scopes;
-    var gaxGrpc = new gax.GrpcClient(opts);
+    const gaxGrpc = new gax.GrpcClient(opts);
 
     // Save the auth object to the client, for use by other methods.
     this.auth = gaxGrpc.auth;
 
     // Determine the client header string.
-    var clientHeader = [
+    const clientHeader = [
       `gl-node/${process.version}`,
       `grpc/${gaxGrpc.grpcVersion}`,
       `gax/${gax.version}`,
@@ -102,7 +102,7 @@ class ProductSearchClient {
     }
 
     // Load the applicable protos.
-    var protos = merge(
+    const protos = merge(
       {},
       gaxGrpc.loadProto(
         path.join(__dirname, '..', '..', 'protos'),
@@ -153,7 +153,7 @@ class ProductSearchClient {
         'products'
       ),
     };
-    var protoFilesRoot = new gax.GoogleProtoFilesRoot();
+    let protoFilesRoot = new gax.GoogleProtoFilesRoot();
     protoFilesRoot = protobuf.loadSync(
       path.join(
         __dirname,
@@ -173,10 +173,10 @@ class ProductSearchClient {
       grpc: gaxGrpc.grpc,
     }).operationsClient(opts);
 
-    var importProductSetsResponse = protoFilesRoot.lookup(
+    const importProductSetsResponse = protoFilesRoot.lookup(
       'google.cloud.vision.v1p3beta1.ImportProductSetsResponse'
     );
-    var importProductSetsMetadata = protoFilesRoot.lookup(
+    const importProductSetsMetadata = protoFilesRoot.lookup(
       'google.cloud.vision.v1p3beta1.BatchOperationMetadata'
     );
 
@@ -189,7 +189,7 @@ class ProductSearchClient {
     };
 
     // Put together the default options sent with requests.
-    var defaults = gaxGrpc.constructSettings(
+    const defaults = gaxGrpc.constructSettings(
       'google.cloud.vision.v1p3beta1.ProductSearch',
       gapicConfig,
       opts.clientConfig,
@@ -203,14 +203,14 @@ class ProductSearchClient {
 
     // Put together the "service stub" for
     // google.cloud.vision.v1p3beta1.ProductSearch.
-    var productSearchStub = gaxGrpc.createStub(
+    const productSearchStub = gaxGrpc.createStub(
       protos.google.cloud.vision.v1p3beta1.ProductSearch,
       opts
     );
 
     // Iterate over each of the methods that the service provides
     // and create an API call method for each.
-    var productSearchStubMethods = [
+    const productSearchStubMethods = [
       'createProductSet',
       'listProductSets',
       'getProductSet',
@@ -235,7 +235,7 @@ class ProductSearchClient {
         productSearchStub.then(
           stub =>
             function() {
-              var args = Array.prototype.slice.call(arguments, 0);
+              const args = Array.prototype.slice.call(arguments, 0);
               return stub[methodName].apply(stub, args);
             }
         ),
@@ -322,21 +322,21 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-   * var productSet = {};
-   * var productSetId = '';
-   * var request = {
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const productSet = {};
+   * const productSetId = '';
+   * const request = {
    *   parent: formattedParent,
    *   productSet: productSet,
    *   productSetId: productSetId,
    * };
    * client.createProductSet(request)
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -400,16 +400,16 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
    * // Iterate over all elements.
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
    *
    * client.listProductSets({parent: formattedParent})
    *   .then(responses => {
-   *     var resources = responses[0];
+   *     const resources = responses[0];
    *     for (let i = 0; i < resources.length; i += 1) {
    *       // doThingsWith(resources[i])
    *     }
@@ -419,17 +419,17 @@ class ProductSearchClient {
    *   });
    *
    * // Or obtain the paged response.
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
    *
    *
-   * var options = {autoPaginate: false};
-   * var callback = responses => {
+   * const options = {autoPaginate: false};
+   * const callback = responses => {
    *   // The actual resources in a response.
-   *   var resources = responses[0];
+   *   const resources = responses[0];
    *   // The next request if the response shows that there are more responses.
-   *   var nextRequest = responses[1];
+   *   const nextRequest = responses[1];
    *   // The actual response object, if necessary.
-   *   // var rawResponse = responses[2];
+   *   // const rawResponse = responses[2];
    *   for (let i = 0; i < resources.length; i += 1) {
    *     // doThingsWith(resources[i]);
    *   }
@@ -489,11 +489,11 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
    * client.listProductSetsStream({parent: formattedParent})
    *   .on('data', element => {
    *     // doThingsWith(element)
@@ -540,14 +540,14 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
+   * const formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
    * client.getProductSet({name: formattedName})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -602,19 +602,19 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var productSet = {};
-   * var updateMask = {};
-   * var request = {
+   * const productSet = {};
+   * const updateMask = {};
+   * const request = {
    *   productSet: productSet,
    *   updateMask: updateMask,
    * };
    * client.updateProductSet(request)
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -660,11 +660,11 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
+   * const formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
    * client.deleteProductSet({name: formattedName}).catch(err => {
    *   console.error(err);
    * });
@@ -720,21 +720,21 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-   * var product = {};
-   * var productId = '';
-   * var request = {
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const product = {};
+   * const productId = '';
+   * const request = {
    *   parent: formattedParent,
    *   product: product,
    *   productId: productId,
    * };
    * client.createProduct(request)
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -798,16 +798,16 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
    * // Iterate over all elements.
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
    *
    * client.listProducts({parent: formattedParent})
    *   .then(responses => {
-   *     var resources = responses[0];
+   *     const resources = responses[0];
    *     for (let i = 0; i < resources.length; i += 1) {
    *       // doThingsWith(resources[i])
    *     }
@@ -817,17 +817,17 @@ class ProductSearchClient {
    *   });
    *
    * // Or obtain the paged response.
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
    *
    *
-   * var options = {autoPaginate: false};
-   * var callback = responses => {
+   * const options = {autoPaginate: false};
+   * const callback = responses => {
    *   // The actual resources in a response.
-   *   var resources = responses[0];
+   *   const resources = responses[0];
    *   // The next request if the response shows that there are more responses.
-   *   var nextRequest = responses[1];
+   *   const nextRequest = responses[1];
    *   // The actual response object, if necessary.
-   *   // var rawResponse = responses[2];
+   *   // const rawResponse = responses[2];
    *   for (let i = 0; i < resources.length; i += 1) {
    *     // doThingsWith(resources[i]);
    *   }
@@ -888,11 +888,11 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
    * client.listProductsStream({parent: formattedParent})
    *   .on('data', element => {
    *     // doThingsWith(element)
@@ -939,14 +939,14 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
+   * const formattedName = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
    * client.getProduct({name: formattedName})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -1009,19 +1009,19 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var product = {};
-   * var updateMask = {};
-   * var request = {
+   * const product = {};
+   * const updateMask = {};
+   * const request = {
    *   product: product,
    *   updateMask: updateMask,
    * };
    * client.updateProduct(request)
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -1068,11 +1068,11 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
+   * const formattedName = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
    * client.deleteProduct({name: formattedName}).catch(err => {
    *   console.error(err);
    * });
@@ -1140,21 +1140,21 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
-   * var referenceImage = {};
-   * var referenceImageId = '';
-   * var request = {
+   * const formattedParent = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
+   * const referenceImage = {};
+   * const referenceImageId = '';
+   * const request = {
    *   parent: formattedParent,
    *   referenceImage: referenceImage,
    *   referenceImageId: referenceImageId,
    * };
    * client.createReferenceImage(request)
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -1204,11 +1204,11 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.referenceImagePath('[PROJECT]', '[LOCATION]', '[PRODUCT]', '[REFERENCE_IMAGE]');
+   * const formattedName = client.referenceImagePath('[PROJECT]', '[LOCATION]', '[PRODUCT]', '[REFERENCE_IMAGE]');
    * client.deleteReferenceImage({name: formattedName}).catch(err => {
    *   console.error(err);
    * });
@@ -1272,16 +1272,16 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
    * // Iterate over all elements.
-   * var formattedParent = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
+   * const formattedParent = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
    *
    * client.listReferenceImages({parent: formattedParent})
    *   .then(responses => {
-   *     var resources = responses[0];
+   *     const resources = responses[0];
    *     for (let i = 0; i < resources.length; i += 1) {
    *       // doThingsWith(resources[i])
    *     }
@@ -1291,17 +1291,17 @@ class ProductSearchClient {
    *   });
    *
    * // Or obtain the paged response.
-   * var formattedParent = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
+   * const formattedParent = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
    *
    *
-   * var options = {autoPaginate: false};
-   * var callback = responses => {
+   * const options = {autoPaginate: false};
+   * const callback = responses => {
    *   // The actual resources in a response.
-   *   var resources = responses[0];
+   *   const resources = responses[0];
    *   // The next request if the response shows that there are more responses.
-   *   var nextRequest = responses[1];
+   *   const nextRequest = responses[1];
    *   // The actual response object, if necessary.
-   *   // var rawResponse = responses[2];
+   *   // const rawResponse = responses[2];
    *   for (let i = 0; i < resources.length; i += 1) {
    *     // doThingsWith(resources[i]);
    *   }
@@ -1362,11 +1362,11 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
+   * const formattedParent = client.productPath('[PROJECT]', '[LOCATION]', '[PRODUCT]');
    * client.listReferenceImagesStream({parent: formattedParent})
    *   .on('data', element => {
    *     // doThingsWith(element)
@@ -1414,14 +1414,14 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.referenceImagePath('[PROJECT]', '[LOCATION]', '[PRODUCT]', '[REFERENCE_IMAGE]');
+   * const formattedName = client.referenceImagePath('[PROJECT]', '[LOCATION]', '[PRODUCT]', '[REFERENCE_IMAGE]');
    * client.getReferenceImage({name: formattedName})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -1472,13 +1472,13 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
-   * var product = '';
-   * var request = {
+   * const formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
+   * const product = '';
+   * const request = {
    *   name: formattedName,
    *   product: product,
    * };
@@ -1531,13 +1531,13 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
-   * var product = '';
-   * var request = {
+   * const formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
+   * const product = '';
+   * const request = {
    *   name: formattedName,
    *   product: product,
    * };
@@ -1608,16 +1608,16 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
    * // Iterate over all elements.
-   * var formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
+   * const formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
    *
    * client.listProductsInProductSet({name: formattedName})
    *   .then(responses => {
-   *     var resources = responses[0];
+   *     const resources = responses[0];
    *     for (let i = 0; i < resources.length; i += 1) {
    *       // doThingsWith(resources[i])
    *     }
@@ -1627,17 +1627,17 @@ class ProductSearchClient {
    *   });
    *
    * // Or obtain the paged response.
-   * var formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
+   * const formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
    *
    *
-   * var options = {autoPaginate: false};
-   * var callback = responses => {
+   * const options = {autoPaginate: false};
+   * const callback = responses => {
    *   // The actual resources in a response.
-   *   var resources = responses[0];
+   *   const resources = responses[0];
    *   // The next request if the response shows that there are more responses.
-   *   var nextRequest = responses[1];
+   *   const nextRequest = responses[1];
    *   // The actual response object, if necessary.
-   *   // var rawResponse = responses[2];
+   *   // const rawResponse = responses[2];
    *   for (let i = 0; i < resources.length; i += 1) {
    *     // doThingsWith(resources[i]);
    *   }
@@ -1702,11 +1702,11 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
+   * const formattedName = client.productSetPath('[PROJECT]', '[LOCATION]', '[PRODUCT_SET]');
    * client.listProductsInProductSetStream({name: formattedName})
    *   .on('data', element => {
    *     // doThingsWith(element)
@@ -1762,13 +1762,13 @@ class ProductSearchClient {
    *
    * const vision = require('@google-cloud/vision');
    *
-   * var client = new vision.v1p3beta1.ProductSearchClient({
+   * const client = new vision.v1p3beta1.ProductSearchClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-   * var inputConfig = {};
-   * var request = {
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const inputConfig = {};
+   * const request = {
    *   parent: formattedParent,
    *   inputConfig: inputConfig,
    * };
@@ -1776,29 +1776,29 @@ class ProductSearchClient {
    * // Handle the operation using the promise pattern.
    * client.importProductSets(request)
    *   .then(responses => {
-   *     var operation = responses[0];
-   *     var initialApiResponse = responses[1];
+   *     const operation = responses[0];
+   *     const initialApiResponse = responses[1];
    *
    *     // Operation#promise starts polling for the completion of the LRO.
    *     return operation.promise();
    *   })
    *   .then(responses => {
    *     // The final result of the operation.
-   *     var result = responses[0];
+   *     const result = responses[0];
    *
    *     // The metadata value of the completed operation.
-   *     var metadata = responses[1];
+   *     const metadata = responses[1];
    *
    *     // The response of the api call returning the complete operation.
-   *     var finalApiResponse = responses[2];
+   *     const finalApiResponse = responses[2];
    *   })
    *   .catch(err => {
    *     console.error(err);
    *   });
    *
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-   * var inputConfig = {};
-   * var request = {
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const inputConfig = {};
+   * const request = {
    *   parent: formattedParent,
    *   inputConfig: inputConfig,
    * };
@@ -1806,8 +1806,8 @@ class ProductSearchClient {
    * // Handle the operation using the event emitter pattern.
    * client.importProductSets(request)
    *   .then(responses => {
-   *     var operation = responses[0];
-   *     var initialApiResponse = responses[1];
+   *     const operation = responses[0];
+   *     const initialApiResponse = responses[1];
    *
    *     // Adding a listener for the "complete" event starts polling for the
    *     // completion of the operation.
diff --git a/packages/google-cloud-vision/test/gapic-v1.js b/packages/google-cloud-vision/test/gapic-v1.js
index f242503594e..7a2b784bfcb 100644
--- a/packages/google-cloud-vision/test/gapic-v1.js
+++ b/packages/google-cloud-vision/test/gapic-v1.js
@@ -18,26 +18,26 @@ const assert = require('assert');
 
 const visionModule = require('../src');
 
-var FAKE_STATUS_CODE = 1;
-var error = new Error();
+const FAKE_STATUS_CODE = 1;
+const error = new Error();
 error.code = FAKE_STATUS_CODE;
 
 describe('ImageAnnotatorClient', () => {
   describe('batchAnnotateImages', () => {
     it('invokes batchAnnotateImages without error', done => {
-      var client = new visionModule.v1.ImageAnnotatorClient({
+      const client = new visionModule.v1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.batchAnnotateImages = mockSimpleGrpcMethod(
@@ -53,14 +53,14 @@ describe('ImageAnnotatorClient', () => {
     });
 
     it('invokes batchAnnotateImages with error', done => {
-      var client = new visionModule.v1.ImageAnnotatorClient({
+      const client = new visionModule.v1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
@@ -82,19 +82,19 @@ describe('ImageAnnotatorClient', () => {
 
   describe('asyncBatchAnnotateFiles', function() {
     it('invokes asyncBatchAnnotateFiles without error', done => {
-      var client = new visionModule.v1.ImageAnnotatorClient({
+      const client = new visionModule.v1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.asyncBatchAnnotateFiles = mockLongRunningGrpcMethod(
@@ -105,7 +105,7 @@ describe('ImageAnnotatorClient', () => {
       client
         .asyncBatchAnnotateFiles(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(responses => {
@@ -118,14 +118,14 @@ describe('ImageAnnotatorClient', () => {
     });
 
     it('invokes asyncBatchAnnotateFiles with error', done => {
-      var client = new visionModule.v1.ImageAnnotatorClient({
+      const client = new visionModule.v1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
@@ -139,7 +139,7 @@ describe('ImageAnnotatorClient', () => {
       client
         .asyncBatchAnnotateFiles(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(() => {
@@ -153,7 +153,7 @@ describe('ImageAnnotatorClient', () => {
     });
 
     it('has longrunning decoder functions', () => {
-      var client = new visionModule.v1.ImageAnnotatorClient({
+      const client = new visionModule.v1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
@@ -185,7 +185,7 @@ function mockSimpleGrpcMethod(expectedRequest, response, error) {
 function mockLongRunningGrpcMethod(expectedRequest, response, error) {
   return request => {
     assert.deepStrictEqual(request, expectedRequest);
-    var mockOperation = {
+    const mockOperation = {
       promise: function() {
         return new Promise((resolve, reject) => {
           if (error) {
diff --git a/packages/google-cloud-vision/test/gapic-v1p1beta1.js b/packages/google-cloud-vision/test/gapic-v1p1beta1.js
index 8812f4fb8e9..c7f75ff3734 100644
--- a/packages/google-cloud-vision/test/gapic-v1p1beta1.js
+++ b/packages/google-cloud-vision/test/gapic-v1p1beta1.js
@@ -18,26 +18,26 @@ const assert = require('assert');
 
 const visionModule = require('../src');
 
-var FAKE_STATUS_CODE = 1;
-var error = new Error();
+const FAKE_STATUS_CODE = 1;
+const error = new Error();
 error.code = FAKE_STATUS_CODE;
 
 describe('ImageAnnotatorClient', () => {
   describe('batchAnnotateImages', () => {
     it('invokes batchAnnotateImages without error', done => {
-      var client = new visionModule.v1p1beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p1beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.batchAnnotateImages = mockSimpleGrpcMethod(
@@ -53,14 +53,14 @@ describe('ImageAnnotatorClient', () => {
     });
 
     it('invokes batchAnnotateImages with error', done => {
-      var client = new visionModule.v1p1beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p1beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
diff --git a/packages/google-cloud-vision/test/gapic-v1p2beta1.js b/packages/google-cloud-vision/test/gapic-v1p2beta1.js
index c53e4d1515e..a832fd5b9dd 100644
--- a/packages/google-cloud-vision/test/gapic-v1p2beta1.js
+++ b/packages/google-cloud-vision/test/gapic-v1p2beta1.js
@@ -18,26 +18,26 @@ const assert = require('assert');
 
 const visionModule = require('../src');
 
-var FAKE_STATUS_CODE = 1;
-var error = new Error();
+const FAKE_STATUS_CODE = 1;
+const error = new Error();
 error.code = FAKE_STATUS_CODE;
 
 describe('ImageAnnotatorClient', () => {
   describe('batchAnnotateImages', () => {
     it('invokes batchAnnotateImages without error', done => {
-      var client = new visionModule.v1p2beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p2beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.batchAnnotateImages = mockSimpleGrpcMethod(
@@ -53,14 +53,14 @@ describe('ImageAnnotatorClient', () => {
     });
 
     it('invokes batchAnnotateImages with error', done => {
-      var client = new visionModule.v1p2beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p2beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
@@ -82,19 +82,19 @@ describe('ImageAnnotatorClient', () => {
 
   describe('asyncBatchAnnotateFiles', function() {
     it('invokes asyncBatchAnnotateFiles without error', done => {
-      var client = new visionModule.v1p2beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p2beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.asyncBatchAnnotateFiles = mockLongRunningGrpcMethod(
@@ -105,7 +105,7 @@ describe('ImageAnnotatorClient', () => {
       client
         .asyncBatchAnnotateFiles(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(responses => {
@@ -118,14 +118,14 @@ describe('ImageAnnotatorClient', () => {
     });
 
     it('invokes asyncBatchAnnotateFiles with error', done => {
-      var client = new visionModule.v1p2beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p2beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
@@ -139,7 +139,7 @@ describe('ImageAnnotatorClient', () => {
       client
         .asyncBatchAnnotateFiles(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(() => {
@@ -153,7 +153,7 @@ describe('ImageAnnotatorClient', () => {
     });
 
     it('has longrunning decoder functions', () => {
-      var client = new visionModule.v1p2beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p2beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
@@ -185,7 +185,7 @@ function mockSimpleGrpcMethod(expectedRequest, response, error) {
 function mockLongRunningGrpcMethod(expectedRequest, response, error) {
   return request => {
     assert.deepStrictEqual(request, expectedRequest);
-    var mockOperation = {
+    const mockOperation = {
       promise: function() {
         return new Promise((resolve, reject) => {
           if (error) {
diff --git a/packages/google-cloud-vision/test/gapic-v1p3beta1.js b/packages/google-cloud-vision/test/gapic-v1p3beta1.js
index 9a4198f0ba7..ea7dca9e9a1 100644
--- a/packages/google-cloud-vision/test/gapic-v1p3beta1.js
+++ b/packages/google-cloud-vision/test/gapic-v1p3beta1.js
@@ -18,32 +18,32 @@ const assert = require('assert');
 
 const visionModule = require('../src');
 
-var FAKE_STATUS_CODE = 1;
-var error = new Error();
+const FAKE_STATUS_CODE = 1;
+const error = new Error();
 error.code = FAKE_STATUS_CODE;
 
 describe('ProductSearchClient', () => {
   describe('createProductSet', () => {
     it('invokes createProductSet without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var productSet = {};
-      var productSetId = 'productSetId4216680';
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const productSet = {};
+      const productSetId = 'productSetId4216680';
+      const request = {
         parent: formattedParent,
         productSet: productSet,
         productSetId: productSetId,
       };
 
       // Mock response
-      var name = 'name3373707';
-      var displayName = 'displayName1615086568';
-      var expectedResponse = {
+      const name = 'name3373707';
+      const displayName = 'displayName1615086568';
+      const expectedResponse = {
         name: name,
         displayName: displayName,
       };
@@ -62,16 +62,16 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes createProductSet with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var productSet = {};
-      var productSetId = 'productSetId4216680';
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const productSet = {};
+      const productSetId = 'productSetId4216680';
+      const request = {
         parent: formattedParent,
         productSet: productSet,
         productSetId: productSetId,
@@ -95,22 +95,22 @@ describe('ProductSearchClient', () => {
 
   describe('listProductSets', () => {
     it('invokes listProductSets without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const request = {
         parent: formattedParent,
       };
 
       // Mock response
-      var nextPageToken = '';
-      var productSetsElement = {};
-      var productSets = [productSetsElement];
-      var expectedResponse = {
+      const nextPageToken = '';
+      const productSetsElement = {};
+      const productSets = [productSetsElement];
+      const expectedResponse = {
         nextPageToken: nextPageToken,
         productSets: productSets,
       };
@@ -133,14 +133,14 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes listProductSets with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const request = {
         parent: formattedParent,
       };
 
@@ -162,25 +162,25 @@ describe('ProductSearchClient', () => {
 
   describe('getProductSet', () => {
     it('invokes getProductSet without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productSetPath(
+      const formattedName = client.productSetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT_SET]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var name2 = 'name2-1052831874';
-      var displayName = 'displayName1615086568';
-      var expectedResponse = {
+      const name2 = 'name2-1052831874';
+      const displayName = 'displayName1615086568';
+      const expectedResponse = {
         name: name2,
         displayName: displayName,
       };
@@ -199,18 +199,18 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes getProductSet with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productSetPath(
+      const formattedName = client.productSetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT_SET]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -232,23 +232,23 @@ describe('ProductSearchClient', () => {
 
   describe('updateProductSet', () => {
     it('invokes updateProductSet without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var productSet = {};
-      var updateMask = {};
-      var request = {
+      const productSet = {};
+      const updateMask = {};
+      const request = {
         productSet: productSet,
         updateMask: updateMask,
       };
 
       // Mock response
-      var name = 'name3373707';
-      var displayName = 'displayName1615086568';
-      var expectedResponse = {
+      const name = 'name3373707';
+      const displayName = 'displayName1615086568';
+      const expectedResponse = {
         name: name,
         displayName: displayName,
       };
@@ -267,15 +267,15 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes updateProductSet with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var productSet = {};
-      var updateMask = {};
-      var request = {
+      const productSet = {};
+      const updateMask = {};
+      const request = {
         productSet: productSet,
         updateMask: updateMask,
       };
@@ -298,18 +298,18 @@ describe('ProductSearchClient', () => {
 
   describe('deleteProductSet', () => {
     it('invokes deleteProductSet without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productSetPath(
+      const formattedName = client.productSetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT_SET]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -323,18 +323,18 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes deleteProductSet with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productSetPath(
+      const formattedName = client.productSetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT_SET]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -355,27 +355,27 @@ describe('ProductSearchClient', () => {
 
   describe('createProduct', () => {
     it('invokes createProduct without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var product = {};
-      var productId = 'productId1753008747';
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const product = {};
+      const productId = 'productId1753008747';
+      const request = {
         parent: formattedParent,
         product: product,
         productId: productId,
       };
 
       // Mock response
-      var name = 'name3373707';
-      var displayName = 'displayName1615086568';
-      var description = 'description-1724546052';
-      var productCategory = 'productCategory-1607451058';
-      var expectedResponse = {
+      const name = 'name3373707';
+      const displayName = 'displayName1615086568';
+      const description = 'description-1724546052';
+      const productCategory = 'productCategory-1607451058';
+      const expectedResponse = {
         name: name,
         displayName: displayName,
         description: description,
@@ -396,16 +396,16 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes createProduct with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var product = {};
-      var productId = 'productId1753008747';
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const product = {};
+      const productId = 'productId1753008747';
+      const request = {
         parent: formattedParent,
         product: product,
         productId: productId,
@@ -429,22 +429,22 @@ describe('ProductSearchClient', () => {
 
   describe('listProducts', () => {
     it('invokes listProducts without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const request = {
         parent: formattedParent,
       };
 
       // Mock response
-      var nextPageToken = '';
-      var productsElement = {};
-      var products = [productsElement];
-      var expectedResponse = {
+      const nextPageToken = '';
+      const productsElement = {};
+      const products = [productsElement];
+      const expectedResponse = {
         nextPageToken: nextPageToken,
         products: products,
       };
@@ -467,14 +467,14 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes listProducts with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const request = {
         parent: formattedParent,
       };
 
@@ -496,27 +496,27 @@ describe('ProductSearchClient', () => {
 
   describe('getProduct', () => {
     it('invokes getProduct without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productPath(
+      const formattedName = client.productPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var name2 = 'name2-1052831874';
-      var displayName = 'displayName1615086568';
-      var description = 'description-1724546052';
-      var productCategory = 'productCategory-1607451058';
-      var expectedResponse = {
+      const name2 = 'name2-1052831874';
+      const displayName = 'displayName1615086568';
+      const description = 'description-1724546052';
+      const productCategory = 'productCategory-1607451058';
+      const expectedResponse = {
         name: name2,
         displayName: displayName,
         description: description,
@@ -537,18 +537,18 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes getProduct with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productPath(
+      const formattedName = client.productPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -570,25 +570,25 @@ describe('ProductSearchClient', () => {
 
   describe('updateProduct', () => {
     it('invokes updateProduct without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var product = {};
-      var updateMask = {};
-      var request = {
+      const product = {};
+      const updateMask = {};
+      const request = {
         product: product,
         updateMask: updateMask,
       };
 
       // Mock response
-      var name = 'name3373707';
-      var displayName = 'displayName1615086568';
-      var description = 'description-1724546052';
-      var productCategory = 'productCategory-1607451058';
-      var expectedResponse = {
+      const name = 'name3373707';
+      const displayName = 'displayName1615086568';
+      const description = 'description-1724546052';
+      const productCategory = 'productCategory-1607451058';
+      const expectedResponse = {
         name: name,
         displayName: displayName,
         description: description,
@@ -609,15 +609,15 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes updateProduct with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var product = {};
-      var updateMask = {};
-      var request = {
+      const product = {};
+      const updateMask = {};
+      const request = {
         product: product,
         updateMask: updateMask,
       };
@@ -640,18 +640,18 @@ describe('ProductSearchClient', () => {
 
   describe('deleteProduct', () => {
     it('invokes deleteProduct without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productPath(
+      const formattedName = client.productPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -665,18 +665,18 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes deleteProduct with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productPath(
+      const formattedName = client.productPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -697,29 +697,29 @@ describe('ProductSearchClient', () => {
 
   describe('createReferenceImage', () => {
     it('invokes createReferenceImage without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.productPath(
+      const formattedParent = client.productPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]'
       );
-      var referenceImage = {};
-      var referenceImageId = 'referenceImageId1946713331';
-      var request = {
+      const referenceImage = {};
+      const referenceImageId = 'referenceImageId1946713331';
+      const request = {
         parent: formattedParent,
         referenceImage: referenceImage,
         referenceImageId: referenceImageId,
       };
 
       // Mock response
-      var name = 'name3373707';
-      var uri = 'uri116076';
-      var expectedResponse = {
+      const name = 'name3373707';
+      const uri = 'uri116076';
+      const expectedResponse = {
         name: name,
         uri: uri,
       };
@@ -738,20 +738,20 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes createReferenceImage with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.productPath(
+      const formattedParent = client.productPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]'
       );
-      var referenceImage = {};
-      var referenceImageId = 'referenceImageId1946713331';
-      var request = {
+      const referenceImage = {};
+      const referenceImageId = 'referenceImageId1946713331';
+      const request = {
         parent: formattedParent,
         referenceImage: referenceImage,
         referenceImageId: referenceImageId,
@@ -775,19 +775,19 @@ describe('ProductSearchClient', () => {
 
   describe('deleteReferenceImage', () => {
     it('invokes deleteReferenceImage without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.referenceImagePath(
+      const formattedName = client.referenceImagePath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]',
         '[REFERENCE_IMAGE]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -803,19 +803,19 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes deleteReferenceImage with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.referenceImagePath(
+      const formattedName = client.referenceImagePath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]',
         '[REFERENCE_IMAGE]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -836,27 +836,27 @@ describe('ProductSearchClient', () => {
 
   describe('listReferenceImages', () => {
     it('invokes listReferenceImages without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.productPath(
+      const formattedParent = client.productPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]'
       );
-      var request = {
+      const request = {
         parent: formattedParent,
       };
 
       // Mock response
-      var pageSize = 883849137;
-      var nextPageToken = '';
-      var referenceImagesElement = {};
-      var referenceImages = [referenceImagesElement];
-      var expectedResponse = {
+      const pageSize = 883849137;
+      const nextPageToken = '';
+      const referenceImagesElement = {};
+      const referenceImages = [referenceImagesElement];
+      const expectedResponse = {
         pageSize: pageSize,
         nextPageToken: nextPageToken,
         referenceImages: referenceImages,
@@ -880,18 +880,18 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes listReferenceImages with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.productPath(
+      const formattedParent = client.productPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]'
       );
-      var request = {
+      const request = {
         parent: formattedParent,
       };
 
@@ -913,26 +913,26 @@ describe('ProductSearchClient', () => {
 
   describe('getReferenceImage', () => {
     it('invokes getReferenceImage without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.referenceImagePath(
+      const formattedName = client.referenceImagePath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]',
         '[REFERENCE_IMAGE]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var name2 = 'name2-1052831874';
-      var uri = 'uri116076';
-      var expectedResponse = {
+      const name2 = 'name2-1052831874';
+      const uri = 'uri116076';
+      const expectedResponse = {
         name: name2,
         uri: uri,
       };
@@ -951,19 +951,19 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes getReferenceImage with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.referenceImagePath(
+      const formattedName = client.referenceImagePath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT]',
         '[REFERENCE_IMAGE]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -985,19 +985,19 @@ describe('ProductSearchClient', () => {
 
   describe('addProductToProductSet', () => {
     it('invokes addProductToProductSet without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productSetPath(
+      const formattedName = client.productSetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT_SET]'
       );
-      var product = 'product-309474065';
-      var request = {
+      const product = 'product-309474065';
+      const request = {
         name: formattedName,
         product: product,
       };
@@ -1014,19 +1014,19 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes addProductToProductSet with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productSetPath(
+      const formattedName = client.productSetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT_SET]'
       );
-      var product = 'product-309474065';
-      var request = {
+      const product = 'product-309474065';
+      const request = {
         name: formattedName,
         product: product,
       };
@@ -1048,19 +1048,19 @@ describe('ProductSearchClient', () => {
 
   describe('removeProductFromProductSet', () => {
     it('invokes removeProductFromProductSet without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productSetPath(
+      const formattedName = client.productSetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT_SET]'
       );
-      var product = 'product-309474065';
-      var request = {
+      const product = 'product-309474065';
+      const request = {
         name: formattedName,
         product: product,
       };
@@ -1077,19 +1077,19 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes removeProductFromProductSet with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productSetPath(
+      const formattedName = client.productSetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT_SET]'
       );
-      var product = 'product-309474065';
-      var request = {
+      const product = 'product-309474065';
+      const request = {
         name: formattedName,
         product: product,
       };
@@ -1111,26 +1111,26 @@ describe('ProductSearchClient', () => {
 
   describe('listProductsInProductSet', () => {
     it('invokes listProductsInProductSet without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productSetPath(
+      const formattedName = client.productSetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT_SET]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var nextPageToken = '';
-      var productsElement = {};
-      var products = [productsElement];
-      var expectedResponse = {
+      const nextPageToken = '';
+      const productsElement = {};
+      const products = [productsElement];
+      const expectedResponse = {
         nextPageToken: nextPageToken,
         products: products,
       };
@@ -1153,18 +1153,18 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes listProductsInProductSet with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.productSetPath(
+      const formattedName = client.productSetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[PRODUCT_SET]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -1186,21 +1186,21 @@ describe('ProductSearchClient', () => {
 
   describe('importProductSets', function() {
     it('invokes importProductSets without error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var inputConfig = {};
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const inputConfig = {};
+      const request = {
         parent: formattedParent,
         inputConfig: inputConfig,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.importProductSets = mockLongRunningGrpcMethod(
@@ -1211,7 +1211,7 @@ describe('ProductSearchClient', () => {
       client
         .importProductSets(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(responses => {
@@ -1224,15 +1224,15 @@ describe('ProductSearchClient', () => {
     });
 
     it('invokes importProductSets with error', done => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var inputConfig = {};
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const inputConfig = {};
+      const request = {
         parent: formattedParent,
         inputConfig: inputConfig,
       };
@@ -1247,7 +1247,7 @@ describe('ProductSearchClient', () => {
       client
         .importProductSets(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(() => {
@@ -1261,7 +1261,7 @@ describe('ProductSearchClient', () => {
     });
 
     it('has longrunning decoder functions', () => {
-      var client = new visionModule.v1p3beta1.ProductSearchClient({
+      const client = new visionModule.v1p3beta1.ProductSearchClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
@@ -1279,19 +1279,19 @@ describe('ProductSearchClient', () => {
 describe('ImageAnnotatorClient', () => {
   describe('batchAnnotateImages', () => {
     it('invokes batchAnnotateImages without error', done => {
-      var client = new visionModule.v1p3beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p3beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.batchAnnotateImages = mockSimpleGrpcMethod(
@@ -1307,14 +1307,14 @@ describe('ImageAnnotatorClient', () => {
     });
 
     it('invokes batchAnnotateImages with error', done => {
-      var client = new visionModule.v1p3beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p3beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
@@ -1336,19 +1336,19 @@ describe('ImageAnnotatorClient', () => {
 
   describe('asyncBatchAnnotateFiles', function() {
     it('invokes asyncBatchAnnotateFiles without error', done => {
-      var client = new visionModule.v1p3beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p3beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.asyncBatchAnnotateFiles = mockLongRunningGrpcMethod(
@@ -1359,7 +1359,7 @@ describe('ImageAnnotatorClient', () => {
       client
         .asyncBatchAnnotateFiles(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(responses => {
@@ -1372,14 +1372,14 @@ describe('ImageAnnotatorClient', () => {
     });
 
     it('invokes asyncBatchAnnotateFiles with error', done => {
-      var client = new visionModule.v1p3beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p3beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var requests = [];
-      var request = {
+      const requests = [];
+      const request = {
         requests: requests,
       };
 
@@ -1393,7 +1393,7 @@ describe('ImageAnnotatorClient', () => {
       client
         .asyncBatchAnnotateFiles(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(() => {
@@ -1407,7 +1407,7 @@ describe('ImageAnnotatorClient', () => {
     });
 
     it('has longrunning decoder functions', () => {
-      var client = new visionModule.v1p3beta1.ImageAnnotatorClient({
+      const client = new visionModule.v1p3beta1.ImageAnnotatorClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
@@ -1439,7 +1439,7 @@ function mockSimpleGrpcMethod(expectedRequest, response, error) {
 function mockLongRunningGrpcMethod(expectedRequest, response, error) {
   return request => {
     assert.deepStrictEqual(request, expectedRequest);
-    var mockOperation = {
+    const mockOperation = {
       promise: function() {
         return new Promise((resolve, reject) => {
           if (error) {