/**

* Copyright Google LLC

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* https://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

// [START gmail_quickstart]

/**

* Lists all labels in the user's mailbox

* @see https://developers.google.com/gmail/api/reference/rest/v1/users.labels/list

*/

function listLabels() {

try {

// Gmail.Users.Labels.list() API returns the list of all Labels in user's mailbox

const response = Gmail.Users.Labels.list("me");

if (!response || response.labels.length === 0) {

// TODO (developer) - No labels are returned from the response

console.log("No labels found.");

return;

}

// Print the Labels that are available.

console.log("Labels:");

for (const label of response.labels) {

console.log("- %s", label.name);

}

} catch (err) {

// TODO (developer) - Handle exception on Labels.list() API

console.log("Labels.list() API failed with error %s", err.toString());

}

}

// [END gmail_quickstart]