chore: add comments for class level

templates/typescript_gapic/src/$version/$service_client.ts.njk

@@ -50,6 +50,33 @@ export interface PaginationResponse<
 }
 {% endif %}
 export class {{ service.name }}Client {
+  /**
+    * Construct an instance of {{ service.name }}Client.
+    *
+    * @@param {object} [options] - The configuration object. See the subsequent
+    *   parameters for more details.
+    * @@param {object} [options.credentials] - Credentials object.
+    * @@param {string} [options.credentials.client_email]
+    * @@param {string} [options.credentials.private_key]
+    * @@param {string} [options.email] - Account email address. Required when
+    *     using a .pem or .p12 keyFilename.
+    * @@param {string} [options.keyFilename] - Full path to the a .json, .pem, or
+    *     .p12 key downloaded from the Google Developers Console. If you provide
+    *     a path to a JSON file, the projectId option below is not necessary.
+    *     NOTE: .pem and .p12 require you to specify options.email as well.
+    * @@param {number} [options.port] - The port on which to connect to
+    *     the remote host.
+    * @@param {string} [options.projectId] - The project ID from the Google
+    *     Developer's Console, e.g. 'grape-spaceship-123'. We will also check
+    *     the environment variable GCLOUD_PROJECT for your project ID. If your
+    *     app is running in an environment which supports
+    *     {@@link https://developers.google.com/identity/protocols/application-default-credentials Application Default Credentials},
+    *     your project ID will be detected automatically.
+    * @@param {function} [options.promise] - Custom promise module to use instead
+    *     of native Promises.
+    * @@param {string} [options.apiEndpoint] - The domain name of the
+    *     API remote host.
+    */
   private _descriptors: Descriptors = {page: {}, stream: {}, longrunning: {}};
   private _innerApiCalls: {[name: string]: Function};
   auth: gax.GoogleAuth;

typescript/test/testdata/keymanager/src/v1/keymanagementservice_client.ts.baseline

@@ -63,6 +63,33 @@ export interface PaginationResponse<
 }
 
 export class KeyManagementServiceClient {
+  /**
+    * Construct an instance of KeyManagementServiceClient.
+    *
+    * @@param {object} [options] - The configuration object. See the subsequent
+    *   parameters for more details.
+    * @@param {object} [options.credentials] - Credentials object.
+    * @@param {string} [options.credentials.client_email]
+    * @@param {string} [options.credentials.private_key]
+    * @@param {string} [options.email] - Account email address. Required when
+    *     using a .pem or .p12 keyFilename.
+    * @@param {string} [options.keyFilename] - Full path to the a .json, .pem, or
+    *     .p12 key downloaded from the Google Developers Console. If you provide
+    *     a path to a JSON file, the projectId option below is not necessary.
+    *     NOTE: .pem and .p12 require you to specify options.email as well.
+    * @@param {number} [options.port] - The port on which to connect to
+    *     the remote host.
+    * @@param {string} [options.projectId] - The project ID from the Google
+    *     Developer's Console, e.g. 'grape-spaceship-123'. We will also check
+    *     the environment variable GCLOUD_PROJECT for your project ID. If your
+    *     app is running in an environment which supports
+    *     {@@link https://developers.google.com/identity/protocols/application-default-credentials Application Default Credentials},
+    *     your project ID will be detected automatically.
+    * @@param {function} [options.promise] - Custom promise module to use instead
+    *     of native Promises.
+    * @@param {string} [options.apiEndpoint] - The domain name of the
+    *     API remote host.
+    */
   private _descriptors: Descriptors = {page: {}, stream: {}, longrunning: {}};
   private _innerApiCalls: {[name: string]: Function};
   auth: gax.GoogleAuth;

typescript/test/testdata/showcase/src/v1beta1/echo_client.ts.baseline

@@ -66,6 +66,33 @@ export interface PaginationResponse<
 }
 
 export class EchoClient {
+  /**
+    * Construct an instance of EchoClient.
+    *
+    * @@param {object} [options] - The configuration object. See the subsequent
+    *   parameters for more details.
+    * @@param {object} [options.credentials] - Credentials object.
+    * @@param {string} [options.credentials.client_email]
+    * @@param {string} [options.credentials.private_key]
+    * @@param {string} [options.email] - Account email address. Required when
+    *     using a .pem or .p12 keyFilename.
+    * @@param {string} [options.keyFilename] - Full path to the a .json, .pem, or
+    *     .p12 key downloaded from the Google Developers Console. If you provide
+    *     a path to a JSON file, the projectId option below is not necessary.
+    *     NOTE: .pem and .p12 require you to specify options.email as well.
+    * @@param {number} [options.port] - The port on which to connect to
+    *     the remote host.
+    * @@param {string} [options.projectId] - The project ID from the Google
+    *     Developer's Console, e.g. 'grape-spaceship-123'. We will also check
+    *     the environment variable GCLOUD_PROJECT for your project ID. If your
+    *     app is running in an environment which supports
+    *     {@@link https://developers.google.com/identity/protocols/application-default-credentials Application Default Credentials},
+    *     your project ID will be detected automatically.
+    * @@param {function} [options.promise] - Custom promise module to use instead
+    *     of native Promises.
+    * @@param {string} [options.apiEndpoint] - The domain name of the
+    *     API remote host.
+    */
   private _descriptors: Descriptors = {page: {}, stream: {}, longrunning: {}};
   private _innerApiCalls: {[name: string]: Function};
   auth: gax.GoogleAuth;