/**

* Copyright 2022 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]

import path from 'node:path';

import process from 'node:process';

import {authenticate} from '@google-cloud/local-auth';

import {google} from 'googleapis';

// The scope for reading Gmail labels.

const SCOPES = ['https://www.googleapis.com/auth/gmail.readonly'];

// The path to the credentials file.

const CREDENTIALS_PATH = path.join(process.cwd(), 'credentials.json');

/**

* Lists the labels in the user's account.

*/

async function listLabels() {

// Authenticate with Google and get an authorized client.

const auth = await authenticate({

scopes: SCOPES,

keyfilePath: CREDENTIALS_PATH,

});

// Create a new Gmail API client.

const gmail = google.gmail({version: 'v1', auth});

// Get the list of labels.

const result = await gmail.users.labels.list({

userId: 'me',

});

const labels = result.data.labels;

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

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

return;

}

console.log('Labels:');

// Print the name of each label.

labels.forEach((label) => {

console.log(`- ${label.name}`);

});

}

await listLabels();

// [END gmail_quickstart]