diff --git a/packages/google-cloud-automl/src/v1beta1/auto_ml_client.js b/packages/google-cloud-automl/src/v1beta1/auto_ml_client.js
index ab8922c10a7..b8c4a9cd36f 100644
--- a/packages/google-cloud-automl/src/v1beta1/auto_ml_client.js
+++ b/packages/google-cloud-automl/src/v1beta1/auto_ml_client.js
@@ -80,13 +80,13 @@ class AutoMlClient {
     // 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}`,
@@ -97,7 +97,7 @@ class AutoMlClient {
     }
 
     // Load the applicable protos.
-    var protos = merge(
+    const protos = merge(
       {},
       gaxGrpc.loadProto(
         path.join(__dirname, '..', '..', 'protos'),
@@ -139,7 +139,7 @@ class AutoMlClient {
         'modelEvaluation'
       ),
     };
-    var protoFilesRoot = new gax.GoogleProtoFilesRoot();
+    let protoFilesRoot = new gax.GoogleProtoFilesRoot();
     protoFilesRoot = protobuf.loadSync(
       path.join(
         __dirname,
@@ -159,26 +159,28 @@ class AutoMlClient {
       grpc: gaxGrpc.grpc,
     }).operationsClient(opts);
 
-    var deleteDatasetResponse = protoFilesRoot.lookup('google.protobuf.Empty');
-    var deleteDatasetMetadata = protoFilesRoot.lookup(
+    const deleteDatasetResponse = protoFilesRoot.lookup(
+      'google.protobuf.Empty'
+    );
+    const deleteDatasetMetadata = protoFilesRoot.lookup(
       'google.cloud.automl.v1beta1.OperationMetadata'
     );
-    var importDataResponse = protoFilesRoot.lookup('google.protobuf.Empty');
-    var importDataMetadata = protoFilesRoot.lookup(
+    const importDataResponse = protoFilesRoot.lookup('google.protobuf.Empty');
+    const importDataMetadata = protoFilesRoot.lookup(
       'google.cloud.automl.v1beta1.OperationMetadata'
     );
-    var exportDataResponse = protoFilesRoot.lookup('google.protobuf.Empty');
-    var exportDataMetadata = protoFilesRoot.lookup(
+    const exportDataResponse = protoFilesRoot.lookup('google.protobuf.Empty');
+    const exportDataMetadata = protoFilesRoot.lookup(
       'google.cloud.automl.v1beta1.OperationMetadata'
     );
-    var createModelResponse = protoFilesRoot.lookup(
+    const createModelResponse = protoFilesRoot.lookup(
       'google.cloud.automl.v1beta1.Model'
     );
-    var createModelMetadata = protoFilesRoot.lookup(
+    const createModelMetadata = protoFilesRoot.lookup(
       'google.cloud.automl.v1beta1.OperationMetadata'
     );
-    var deleteModelResponse = protoFilesRoot.lookup('google.protobuf.Empty');
-    var deleteModelMetadata = protoFilesRoot.lookup(
+    const deleteModelResponse = protoFilesRoot.lookup('google.protobuf.Empty');
+    const deleteModelMetadata = protoFilesRoot.lookup(
       'google.cloud.automl.v1beta1.OperationMetadata'
     );
 
@@ -211,7 +213,7 @@ class AutoMlClient {
     };
 
     // Put together the default options sent with requests.
-    var defaults = gaxGrpc.constructSettings(
+    const defaults = gaxGrpc.constructSettings(
       'google.cloud.automl.v1beta1.AutoMl',
       gapicConfig,
       opts.clientConfig,
@@ -225,14 +227,14 @@ class AutoMlClient {
 
     // Put together the "service stub" for
     // google.cloud.automl.v1beta1.AutoMl.
-    var autoMlStub = gaxGrpc.createStub(
+    const autoMlStub = gaxGrpc.createStub(
       protos.google.cloud.automl.v1beta1.AutoMl,
       opts
     );
 
     // Iterate over each of the methods that the service provides
     // and create an API call method for each.
-    var autoMlStubMethods = [
+    const autoMlStubMethods = [
       'createDataset',
       'getDataset',
       'listDatasets',
@@ -253,7 +255,7 @@ class AutoMlClient {
         autoMlStub.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);
             }
         ),
@@ -325,19 +327,19 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-   * var dataset = {};
-   * var request = {
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const dataset = {};
+   * const request = {
    *   parent: formattedParent,
    *   dataset: dataset,
    * };
    * client.createDataset(request)
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -376,14 +378,14 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
+   * const formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
    * client.getDataset({name: formattedName})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -449,16 +451,16 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
    * // Iterate over all elements.
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
    *
    * client.listDatasets({parent: formattedParent})
    *   .then(responses => {
-   *     var resources = responses[0];
+   *     const resources = responses[0];
    *     for (let i = 0; i < resources.length; i += 1) {
    *       // doThingsWith(resources[i])
    *     }
@@ -468,17 +470,17 @@ class AutoMlClient {
    *   });
    *
    * // 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]);
    *   }
@@ -545,11 +547,11 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
    * client.listDatasetsStream({parent: formattedParent})
    *   .on('data', element => {
    *     // doThingsWith(element)
@@ -593,42 +595,42 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
+   * const formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
    *
    * // Handle the operation using the promise pattern.
    * client.deleteDataset({name: formattedName})
    *   .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 formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
+   * const formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
    *
    * // Handle the operation using the event emitter pattern.
    * client.deleteDataset({name: formattedName})
    *   .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.
@@ -690,13 +692,13 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
-   * var inputConfig = {};
-   * var request = {
+   * const formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
+   * const inputConfig = {};
+   * const request = {
    *   name: formattedName,
    *   inputConfig: inputConfig,
    * };
@@ -704,29 +706,29 @@ class AutoMlClient {
    * // Handle the operation using the promise pattern.
    * client.importData(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 formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
-   * var inputConfig = {};
-   * var request = {
+   * const formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
+   * const inputConfig = {};
+   * const request = {
    *   name: formattedName,
    *   inputConfig: inputConfig,
    * };
@@ -734,8 +736,8 @@ class AutoMlClient {
    * // Handle the operation using the event emitter pattern.
    * client.importData(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.
@@ -796,13 +798,13 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
-   * var outputConfig = {};
-   * var request = {
+   * const formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
+   * const outputConfig = {};
+   * const request = {
    *   name: formattedName,
    *   outputConfig: outputConfig,
    * };
@@ -810,29 +812,29 @@ class AutoMlClient {
    * // Handle the operation using the promise pattern.
    * client.exportData(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 formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
-   * var outputConfig = {};
-   * var request = {
+   * const formattedName = client.datasetPath('[PROJECT]', '[LOCATION]', '[DATASET]');
+   * const outputConfig = {};
+   * const request = {
    *   name: formattedName,
    *   outputConfig: outputConfig,
    * };
@@ -840,8 +842,8 @@ class AutoMlClient {
    * // Handle the operation using the event emitter pattern.
    * client.exportData(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.
@@ -904,13 +906,13 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-   * var model = {};
-   * var request = {
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const model = {};
+   * const request = {
    *   parent: formattedParent,
    *   model: model,
    * };
@@ -918,29 +920,29 @@ class AutoMlClient {
    * // Handle the operation using the promise pattern.
    * client.createModel(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 model = {};
-   * var request = {
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const model = {};
+   * const request = {
    *   parent: formattedParent,
    *   model: model,
    * };
@@ -948,8 +950,8 @@ class AutoMlClient {
    * // Handle the operation using the event emitter pattern.
    * client.createModel(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.
@@ -1004,14 +1006,14 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
+   * const formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
    * client.getModel({name: formattedName})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -1080,16 +1082,16 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
    * // Iterate over all elements.
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
    *
    * client.listModels({parent: formattedParent})
    *   .then(responses => {
-   *     var resources = responses[0];
+   *     const resources = responses[0];
    *     for (let i = 0; i < resources.length; i += 1) {
    *       // doThingsWith(resources[i])
    *     }
@@ -1099,17 +1101,17 @@ class AutoMlClient {
    *   });
    *
    * // 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]);
    *   }
@@ -1179,11 +1181,11 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+   * const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
    * client.listModelsStream({parent: formattedParent})
    *   .on('data', element => {
    *     // doThingsWith(element)
@@ -1230,42 +1232,42 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
+   * const formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
    *
    * // Handle the operation using the promise pattern.
    * client.deleteModel({name: formattedName})
    *   .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 formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
+   * const formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
    *
    * // Handle the operation using the event emitter pattern.
    * client.deleteModel({name: formattedName})
    *   .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.
@@ -1322,14 +1324,14 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
+   * const formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
    * client.deployModel({name: formattedName})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -1370,14 +1372,14 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
+   * const formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
    * client.undeployModel({name: formattedName})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -1416,14 +1418,14 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.modelEvaluationPath('[PROJECT]', '[LOCATION]', '[MODEL]', '[MODEL_EVALUATION]');
+   * const formattedName = client.modelEvaluationPath('[PROJECT]', '[LOCATION]', '[MODEL]', '[MODEL_EVALUATION]');
    * client.getModelEvaluation({name: formattedName})
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
@@ -1494,16 +1496,16 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
    * // Iterate over all elements.
-   * var formattedParent = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
+   * const formattedParent = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
    *
    * client.listModelEvaluations({parent: formattedParent})
    *   .then(responses => {
-   *     var resources = responses[0];
+   *     const resources = responses[0];
    *     for (let i = 0; i < resources.length; i += 1) {
    *       // doThingsWith(resources[i])
    *     }
@@ -1513,17 +1515,17 @@ class AutoMlClient {
    *   });
    *
    * // Or obtain the paged response.
-   * var formattedParent = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
+   * const formattedParent = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
    *
    *
-   * 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]);
    *   }
@@ -1595,11 +1597,11 @@ class AutoMlClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.AutoMlClient({
+   * const client = new automl.v1beta1.AutoMlClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedParent = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
+   * const formattedParent = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
    * client.listModelEvaluationsStream({parent: formattedParent})
    *   .on('data', element => {
    *     // doThingsWith(element)
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_annotation_payload.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_annotation_payload.js
index 23438d58a55..dbe063bb394 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_annotation_payload.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_annotation_payload.js
@@ -44,6 +44,6 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.AnnotationPayload definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/annotation_payload.proto}
  */
-var AnnotationPayload = {
+const AnnotationPayload = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_classification.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_classification.js
index ea822898c3e..3b2a753877c 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_classification.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_classification.js
@@ -29,7 +29,7 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ClassificationAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/classification.proto}
  */
-var ClassificationAnnotation = {
+const ClassificationAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -64,7 +64,7 @@ var ClassificationAnnotation = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ClassificationEvaluationMetrics definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/classification.proto}
  */
-var ClassificationEvaluationMetrics = {
+const ClassificationEvaluationMetrics = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
@@ -149,7 +149,7 @@ var ClassificationEvaluationMetrics = {
  * @enum {number}
  * @memberof google.cloud.automl.v1beta1
  */
-var ClassificationType = {
+const ClassificationType = {
 
   /**
    * Should not be used, an un-set enum has this value by default.
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_data_items.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_data_items.js
index 4b02ba83cee..d19aa4e92eb 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_data_items.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_data_items.js
@@ -35,7 +35,7 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.Image definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/data_items.proto}
  */
-var Image = {
+const Image = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -59,7 +59,7 @@ var Image = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.TextSnippet definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/data_items.proto}
  */
-var TextSnippet = {
+const TextSnippet = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -80,6 +80,6 @@ var TextSnippet = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ExamplePayload definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/data_items.proto}
  */
-var ExamplePayload = {
+const ExamplePayload = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_dataset.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_dataset.js
index 98b33eebd12..aff3ea19966 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_dataset.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_dataset.js
@@ -56,6 +56,6 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.Dataset definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/dataset.proto}
  */
-var Dataset = {
+const Dataset = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_image.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_image.js
index 201a27fddd3..5b11172b148 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_image.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_image.js
@@ -28,7 +28,7 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ImageClassificationDatasetMetadata definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/image.proto}
  */
-var ImageClassificationDatasetMetadata = {
+const ImageClassificationDatasetMetadata = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -58,6 +58,6 @@ var ImageClassificationDatasetMetadata = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ImageClassificationModelMetadata definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/image.proto}
  */
-var ImageClassificationModelMetadata = {
+const ImageClassificationModelMetadata = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_io.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_io.js
index e2301adfcbf..f69974415ce 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_io.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_io.js
@@ -27,7 +27,7 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.InputConfig definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/io.proto}
  */
-var InputConfig = {
+const InputConfig = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -43,7 +43,7 @@ var InputConfig = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.OutputConfig definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/io.proto}
  */
-var OutputConfig = {
+const OutputConfig = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -59,7 +59,7 @@ var OutputConfig = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.GcsSource definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/io.proto}
  */
-var GcsSource = {
+const GcsSource = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -78,6 +78,6 @@ var GcsSource = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.GcsDestination definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/io.proto}
  */
-var GcsDestination = {
+const GcsDestination = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_model.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_model.js
index b48ff025003..2792bc432f4 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_model.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_model.js
@@ -71,7 +71,7 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.Model definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/model.proto}
  */
-var Model = {
+const Model = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_model_evaluation.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_model_evaluation.js
index 3203c83512c..47fa43795dd 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_model_evaluation.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_model_evaluation.js
@@ -56,6 +56,6 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ModelEvaluation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/model_evaluation.proto}
  */
-var ModelEvaluation = {
+const ModelEvaluation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_prediction_service.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_prediction_service.js
index 9308074d092..695f89fdf8d 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_prediction_service.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_prediction_service.js
@@ -43,7 +43,7 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.PredictRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/prediction_service.proto}
  */
-var PredictRequest = {
+const PredictRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -66,6 +66,6 @@ var PredictRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.PredictResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/prediction_service.proto}
  */
-var PredictResponse = {
+const PredictResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_service.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_service.js
index 3be431eb6bb..567e6a0bed1 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_service.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_service.js
@@ -30,7 +30,7 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.CreateDatasetRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var CreateDatasetRequest = {
+const CreateDatasetRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -44,7 +44,7 @@ var CreateDatasetRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.GetDatasetRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var GetDatasetRequest = {
+const GetDatasetRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -78,7 +78,7 @@ var GetDatasetRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ListDatasetsRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var ListDatasetsRequest = {
+const ListDatasetsRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -98,7 +98,7 @@ var ListDatasetsRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ListDatasetsResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var ListDatasetsResponse = {
+const ListDatasetsResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -112,7 +112,7 @@ var ListDatasetsResponse = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.DeleteDatasetRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var DeleteDatasetRequest = {
+const DeleteDatasetRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -132,7 +132,7 @@ var DeleteDatasetRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ImportDataRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var ImportDataRequest = {
+const ImportDataRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -151,7 +151,7 @@ var ImportDataRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ExportDataRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var ExportDataRequest = {
+const ExportDataRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -170,7 +170,7 @@ var ExportDataRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.CreateModelRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var CreateModelRequest = {
+const CreateModelRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -184,7 +184,7 @@ var CreateModelRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.GetModelRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var GetModelRequest = {
+const GetModelRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -220,7 +220,7 @@ var GetModelRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ListModelsRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var ListModelsRequest = {
+const ListModelsRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -240,7 +240,7 @@ var ListModelsRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ListModelsResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var ListModelsResponse = {
+const ListModelsResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -254,7 +254,7 @@ var ListModelsResponse = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.DeleteModelRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var DeleteModelRequest = {
+const DeleteModelRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -268,7 +268,7 @@ var DeleteModelRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.DeployModelRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var DeployModelRequest = {
+const DeployModelRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -282,7 +282,7 @@ var DeployModelRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.UndeployModelRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var UndeployModelRequest = {
+const UndeployModelRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -296,7 +296,7 @@ var UndeployModelRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.GetModelEvaluationRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var GetModelEvaluationRequest = {
+const GetModelEvaluationRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -334,7 +334,7 @@ var GetModelEvaluationRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ListModelEvaluationsRequest definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var ListModelEvaluationsRequest = {
+const ListModelEvaluationsRequest = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -354,6 +354,6 @@ var ListModelEvaluationsRequest = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.ListModelEvaluationsResponse definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/service.proto}
  */
-var ListModelEvaluationsResponse = {
+const ListModelEvaluationsResponse = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_text.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_text.js
index 1ad592d93a4..357ca6ccc99 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_text.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_text.js
@@ -28,7 +28,7 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.TextClassificationDatasetMetadata definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/text.proto}
  */
-var TextClassificationDatasetMetadata = {
+const TextClassificationDatasetMetadata = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -38,6 +38,6 @@ var TextClassificationDatasetMetadata = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.TextClassificationModelMetadata definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/text.proto}
  */
-var TextClassificationModelMetadata = {
+const TextClassificationModelMetadata = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_translation.js b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_translation.js
index f7bfe8d1842..76faa84e3bf 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_translation.js
+++ b/packages/google-cloud-automl/src/v1beta1/doc/google/cloud/automl/v1beta1/doc_translation.js
@@ -28,7 +28,7 @@
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.TranslationDatasetMetadata definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/translation.proto}
  */
-var TranslationDatasetMetadata = {
+const TranslationDatasetMetadata = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -45,7 +45,7 @@ var TranslationDatasetMetadata = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.TranslationEvaluationMetrics definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/translation.proto}
  */
-var TranslationEvaluationMetrics = {
+const TranslationEvaluationMetrics = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -70,7 +70,7 @@ var TranslationEvaluationMetrics = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.TranslationModelMetadata definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/translation.proto}
  */
-var TranslationModelMetadata = {
+const TranslationModelMetadata = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
 
@@ -86,6 +86,6 @@ var TranslationModelMetadata = {
  * @memberof google.cloud.automl.v1beta1
  * @see [google.cloud.automl.v1beta1.TranslationAnnotation definition in proto format]{@link https://github.com/googleapis/googleapis/blob/master/google/cloud/automl/v1beta1/translation.proto}
  */
-var TranslationAnnotation = {
+const TranslationAnnotation = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 };
\ No newline at end of file
diff --git a/packages/google-cloud-automl/src/v1beta1/doc/google/longrunning/doc_operations.js b/packages/google-cloud-automl/src/v1beta1/doc/google/longrunning/doc_operations.js
index 79ef6344437..4af5d7d3574 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/longrunning/doc_operations.js
+++ b/packages/google-cloud-automl/src/v1beta1/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-automl/src/v1beta1/doc/google/protobuf/doc_any.js b/packages/google-cloud-automl/src/v1beta1/doc/google/protobuf/doc_any.js
index c5c5bbafa23..3accb1fc0d8 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/protobuf/doc_any.js
+++ b/packages/google-cloud-automl/src/v1beta1/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-automl/src/v1beta1/doc/google/protobuf/doc_timestamp.js b/packages/google-cloud-automl/src/v1beta1/doc/google/protobuf/doc_timestamp.js
index 51d8f40f54d..1ebe2e6e1a5 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/protobuf/doc_timestamp.js
+++ b/packages/google-cloud-automl/src/v1beta1/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-automl/src/v1beta1/doc/google/rpc/doc_status.js b/packages/google-cloud-automl/src/v1beta1/doc/google/rpc/doc_status.js
index 7122f1682e0..13cfcab1021 100644
--- a/packages/google-cloud-automl/src/v1beta1/doc/google/rpc/doc_status.js
+++ b/packages/google-cloud-automl/src/v1beta1/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-automl/src/v1beta1/prediction_service_client.js b/packages/google-cloud-automl/src/v1beta1/prediction_service_client.js
index 425b5a3b96e..cc65f146523 100644
--- a/packages/google-cloud-automl/src/v1beta1/prediction_service_client.js
+++ b/packages/google-cloud-automl/src/v1beta1/prediction_service_client.js
@@ -71,13 +71,13 @@ class PredictionServiceClient {
     // 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}`,
@@ -88,7 +88,7 @@ class PredictionServiceClient {
     }
 
     // Load the applicable protos.
-    var protos = merge(
+    const protos = merge(
       {},
       gaxGrpc.loadProto(
         path.join(__dirname, '..', '..', 'protos'),
@@ -106,7 +106,7 @@ class PredictionServiceClient {
     };
 
     // Put together the default options sent with requests.
-    var defaults = gaxGrpc.constructSettings(
+    const defaults = gaxGrpc.constructSettings(
       'google.cloud.automl.v1beta1.PredictionService',
       gapicConfig,
       opts.clientConfig,
@@ -120,20 +120,20 @@ class PredictionServiceClient {
 
     // Put together the "service stub" for
     // google.cloud.automl.v1beta1.PredictionService.
-    var predictionServiceStub = gaxGrpc.createStub(
+    const predictionServiceStub = gaxGrpc.createStub(
       protos.google.cloud.automl.v1beta1.PredictionService,
       opts
     );
 
     // Iterate over each of the methods that the service provides
     // and create an API call method for each.
-    var predictionServiceStubMethods = ['predict'];
+    const predictionServiceStubMethods = ['predict'];
     for (let methodName of predictionServiceStubMethods) {
       this._innerApiCalls[methodName] = gax.createApiCall(
         predictionServiceStub.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);
             }
         ),
@@ -216,19 +216,19 @@ class PredictionServiceClient {
    *
    * const automl = require('automl.v1beta1');
    *
-   * var client = new automl.v1beta1.PredictionServiceClient({
+   * const client = new automl.v1beta1.PredictionServiceClient({
    *   // optional auth parameters.
    * });
    *
-   * var formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
-   * var payload = {};
-   * var request = {
+   * const formattedName = client.modelPath('[PROJECT]', '[LOCATION]', '[MODEL]');
+   * const payload = {};
+   * const request = {
    *   name: formattedName,
    *   payload: payload,
    * };
    * client.predict(request)
    *   .then(responses => {
-   *     var response = responses[0];
+   *     const response = responses[0];
    *     // doThingsWith(response)
    *   })
    *   .catch(err => {
diff --git a/packages/google-cloud-automl/test/gapic-v1beta1.js b/packages/google-cloud-automl/test/gapic-v1beta1.js
index 6f16b4d928f..89e9c7db2be 100644
--- a/packages/google-cloud-automl/test/gapic-v1beta1.js
+++ b/packages/google-cloud-automl/test/gapic-v1beta1.js
@@ -18,32 +18,32 @@ const assert = require('assert');
 
 const automlModule = 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('PredictionServiceClient', () => {
   describe('predict', () => {
     it('invokes predict without error', done => {
-      var client = new automlModule.v1beta1.PredictionServiceClient({
+      const client = new automlModule.v1beta1.PredictionServiceClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelPath(
+      const formattedName = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var payload = {};
-      var request = {
+      const payload = {};
+      const request = {
         name: formattedName,
         payload: payload,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.predict = mockSimpleGrpcMethod(
@@ -59,19 +59,19 @@ describe('PredictionServiceClient', () => {
     });
 
     it('invokes predict with error', done => {
-      var client = new automlModule.v1beta1.PredictionServiceClient({
+      const client = new automlModule.v1beta1.PredictionServiceClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelPath(
+      const formattedName = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var payload = {};
-      var request = {
+      const payload = {};
+      const request = {
         name: formattedName,
         payload: payload,
       };
@@ -95,24 +95,24 @@ describe('PredictionServiceClient', () => {
 describe('AutoMlClient', () => {
   describe('createDataset', () => {
     it('invokes createDataset without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var dataset = {};
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const dataset = {};
+      const request = {
         parent: formattedParent,
         dataset: dataset,
       };
 
       // Mock response
-      var name = 'name3373707';
-      var displayName = 'displayName1615086568';
-      var exampleCount = 1517063674;
-      var expectedResponse = {
+      const name = 'name3373707';
+      const displayName = 'displayName1615086568';
+      const exampleCount = 1517063674;
+      const expectedResponse = {
         name: name,
         displayName: displayName,
         exampleCount: exampleCount,
@@ -132,15 +132,15 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes createDataset with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var dataset = {};
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const dataset = {};
+      const request = {
         parent: formattedParent,
         dataset: dataset,
       };
@@ -163,26 +163,26 @@ describe('AutoMlClient', () => {
 
   describe('getDataset', () => {
     it('invokes getDataset without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.datasetPath(
+      const formattedName = client.datasetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[DATASET]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var name2 = 'name2-1052831874';
-      var displayName = 'displayName1615086568';
-      var exampleCount = 1517063674;
-      var expectedResponse = {
+      const name2 = 'name2-1052831874';
+      const displayName = 'displayName1615086568';
+      const exampleCount = 1517063674;
+      const expectedResponse = {
         name: name2,
         displayName: displayName,
         exampleCount: exampleCount,
@@ -202,18 +202,18 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes getDataset with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.datasetPath(
+      const formattedName = client.datasetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[DATASET]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -235,22 +235,22 @@ describe('AutoMlClient', () => {
 
   describe('listDatasets', () => {
     it('invokes listDatasets without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         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 datasetsElement = {};
-      var datasets = [datasetsElement];
-      var expectedResponse = {
+      const nextPageToken = '';
+      const datasetsElement = {};
+      const datasets = [datasetsElement];
+      const expectedResponse = {
         nextPageToken: nextPageToken,
         datasets: datasets,
       };
@@ -273,14 +273,14 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes listDatasets with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         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,
       };
 
@@ -302,23 +302,23 @@ describe('AutoMlClient', () => {
 
   describe('deleteDataset', function() {
     it('invokes deleteDataset without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.datasetPath(
+      const formattedName = client.datasetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[DATASET]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.deleteDataset = mockLongRunningGrpcMethod(
@@ -329,7 +329,7 @@ describe('AutoMlClient', () => {
       client
         .deleteDataset(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(responses => {
@@ -342,18 +342,18 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes deleteDataset with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.datasetPath(
+      const formattedName = client.datasetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[DATASET]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -367,7 +367,7 @@ describe('AutoMlClient', () => {
       client
         .deleteDataset(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(() => {
@@ -381,7 +381,7 @@ describe('AutoMlClient', () => {
     });
 
     it('has longrunning decoder functions', () => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
@@ -398,25 +398,25 @@ describe('AutoMlClient', () => {
 
   describe('importData', function() {
     it('invokes importData without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.datasetPath(
+      const formattedName = client.datasetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[DATASET]'
       );
-      var inputConfig = {};
-      var request = {
+      const inputConfig = {};
+      const request = {
         name: formattedName,
         inputConfig: inputConfig,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.importData = mockLongRunningGrpcMethod(
@@ -427,7 +427,7 @@ describe('AutoMlClient', () => {
       client
         .importData(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(responses => {
@@ -440,19 +440,19 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes importData with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.datasetPath(
+      const formattedName = client.datasetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[DATASET]'
       );
-      var inputConfig = {};
-      var request = {
+      const inputConfig = {};
+      const request = {
         name: formattedName,
         inputConfig: inputConfig,
       };
@@ -467,7 +467,7 @@ describe('AutoMlClient', () => {
       client
         .importData(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(() => {
@@ -481,7 +481,7 @@ describe('AutoMlClient', () => {
     });
 
     it('has longrunning decoder functions', () => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
@@ -498,25 +498,25 @@ describe('AutoMlClient', () => {
 
   describe('exportData', function() {
     it('invokes exportData without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.datasetPath(
+      const formattedName = client.datasetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[DATASET]'
       );
-      var outputConfig = {};
-      var request = {
+      const outputConfig = {};
+      const request = {
         name: formattedName,
         outputConfig: outputConfig,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.exportData = mockLongRunningGrpcMethod(
@@ -527,7 +527,7 @@ describe('AutoMlClient', () => {
       client
         .exportData(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(responses => {
@@ -540,19 +540,19 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes exportData with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.datasetPath(
+      const formattedName = client.datasetPath(
         '[PROJECT]',
         '[LOCATION]',
         '[DATASET]'
       );
-      var outputConfig = {};
-      var request = {
+      const outputConfig = {};
+      const request = {
         name: formattedName,
         outputConfig: outputConfig,
       };
@@ -567,7 +567,7 @@ describe('AutoMlClient', () => {
       client
         .exportData(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(() => {
@@ -581,7 +581,7 @@ describe('AutoMlClient', () => {
     });
 
     it('has longrunning decoder functions', () => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
@@ -598,24 +598,24 @@ describe('AutoMlClient', () => {
 
   describe('createModel', function() {
     it('invokes createModel without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var model = {};
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const model = {};
+      const request = {
         parent: formattedParent,
         model: model,
       };
 
       // Mock response
-      var name = 'name3373707';
-      var displayName = 'displayName1615086568';
-      var datasetId = 'datasetId-2115646910';
-      var expectedResponse = {
+      const name = 'name3373707';
+      const displayName = 'displayName1615086568';
+      const datasetId = 'datasetId-2115646910';
+      const expectedResponse = {
         name: name,
         displayName: displayName,
         datasetId: datasetId,
@@ -630,7 +630,7 @@ describe('AutoMlClient', () => {
       client
         .createModel(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(responses => {
@@ -643,15 +643,15 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes createModel with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
-      var model = {};
-      var request = {
+      const formattedParent = client.locationPath('[PROJECT]', '[LOCATION]');
+      const model = {};
+      const request = {
         parent: formattedParent,
         model: model,
       };
@@ -666,7 +666,7 @@ describe('AutoMlClient', () => {
       client
         .createModel(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(() => {
@@ -680,7 +680,7 @@ describe('AutoMlClient', () => {
     });
 
     it('has longrunning decoder functions', () => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
@@ -697,26 +697,26 @@ describe('AutoMlClient', () => {
 
   describe('getModel', () => {
     it('invokes getModel without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelPath(
+      const formattedName = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var name2 = 'name2-1052831874';
-      var displayName = 'displayName1615086568';
-      var datasetId = 'datasetId-2115646910';
-      var expectedResponse = {
+      const name2 = 'name2-1052831874';
+      const displayName = 'displayName1615086568';
+      const datasetId = 'datasetId-2115646910';
+      const expectedResponse = {
         name: name2,
         displayName: displayName,
         datasetId: datasetId,
@@ -736,18 +736,18 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes getModel with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelPath(
+      const formattedName = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -769,22 +769,22 @@ describe('AutoMlClient', () => {
 
   describe('listModels', () => {
     it('invokes listModels without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         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 modelElement = {};
-      var model = [modelElement];
-      var expectedResponse = {
+      const nextPageToken = '';
+      const modelElement = {};
+      const model = [modelElement];
+      const expectedResponse = {
         nextPageToken: nextPageToken,
         model: model,
       };
@@ -803,14 +803,14 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes listModels with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         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,
       };
 
@@ -832,23 +832,23 @@ describe('AutoMlClient', () => {
 
   describe('deleteModel', function() {
     it('invokes deleteModel without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelPath(
+      const formattedName = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var expectedResponse = {};
+      const expectedResponse = {};
 
       // Mock Grpc layer
       client._innerApiCalls.deleteModel = mockLongRunningGrpcMethod(
@@ -859,7 +859,7 @@ describe('AutoMlClient', () => {
       client
         .deleteModel(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(responses => {
@@ -872,18 +872,18 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes deleteModel with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelPath(
+      const formattedName = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -897,7 +897,7 @@ describe('AutoMlClient', () => {
       client
         .deleteModel(request)
         .then(responses => {
-          var operation = responses[0];
+          const operation = responses[0];
           return operation.promise();
         })
         .then(() => {
@@ -911,7 +911,7 @@ describe('AutoMlClient', () => {
     });
 
     it('has longrunning decoder functions', () => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
@@ -928,25 +928,25 @@ describe('AutoMlClient', () => {
 
   describe('deployModel', () => {
     it('invokes deployModel without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelPath(
+      const formattedName = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var name2 = 'name2-1052831874';
-      var done_ = true;
-      var expectedResponse = {
+      const name2 = 'name2-1052831874';
+      const done_ = true;
+      const expectedResponse = {
         name: name2,
         done: done_,
       };
@@ -965,18 +965,18 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes deployModel with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelPath(
+      const formattedName = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -998,25 +998,25 @@ describe('AutoMlClient', () => {
 
   describe('undeployModel', () => {
     it('invokes undeployModel without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelPath(
+      const formattedName = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var name2 = 'name2-1052831874';
-      var done_ = true;
-      var expectedResponse = {
+      const name2 = 'name2-1052831874';
+      const done_ = true;
+      const expectedResponse = {
         name: name2,
         done: done_,
       };
@@ -1035,18 +1035,18 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes undeployModel with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelPath(
+      const formattedName = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -1068,27 +1068,27 @@ describe('AutoMlClient', () => {
 
   describe('getModelEvaluation', () => {
     it('invokes getModelEvaluation without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelEvaluationPath(
+      const formattedName = client.modelEvaluationPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]',
         '[MODEL_EVALUATION]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
       // Mock response
-      var name2 = 'name2-1052831874';
-      var annotationSpecId = 'annotationSpecId60690191';
-      var evaluatedExampleCount = 277565350;
-      var expectedResponse = {
+      const name2 = 'name2-1052831874';
+      const annotationSpecId = 'annotationSpecId60690191';
+      const evaluatedExampleCount = 277565350;
+      const expectedResponse = {
         name: name2,
         annotationSpecId: annotationSpecId,
         evaluatedExampleCount: evaluatedExampleCount,
@@ -1108,19 +1108,19 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes getModelEvaluation with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedName = client.modelEvaluationPath(
+      const formattedName = client.modelEvaluationPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]',
         '[MODEL_EVALUATION]'
       );
-      var request = {
+      const request = {
         name: formattedName,
       };
 
@@ -1142,26 +1142,26 @@ describe('AutoMlClient', () => {
 
   describe('listModelEvaluations', () => {
     it('invokes listModelEvaluations without error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.modelPath(
+      const formattedParent = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var request = {
+      const request = {
         parent: formattedParent,
       };
 
       // Mock response
-      var nextPageToken = '';
-      var modelEvaluationElement = {};
-      var modelEvaluation = [modelEvaluationElement];
-      var expectedResponse = {
+      const nextPageToken = '';
+      const modelEvaluationElement = {};
+      const modelEvaluation = [modelEvaluationElement];
+      const expectedResponse = {
         nextPageToken: nextPageToken,
         modelEvaluation: modelEvaluation,
       };
@@ -1184,18 +1184,18 @@ describe('AutoMlClient', () => {
     });
 
     it('invokes listModelEvaluations with error', done => {
-      var client = new automlModule.v1beta1.AutoMlClient({
+      const client = new automlModule.v1beta1.AutoMlClient({
         credentials: {client_email: 'bogus', private_key: 'bogus'},
         projectId: 'bogus',
       });
 
       // Mock request
-      var formattedParent = client.modelPath(
+      const formattedParent = client.modelPath(
         '[PROJECT]',
         '[LOCATION]',
         '[MODEL]'
       );
-      var request = {
+      const request = {
         parent: formattedParent,
       };
 
@@ -1232,7 +1232,7 @@ 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) {