code: function listFiles(auth) {
    const service = google.drive('v3');
    service.files.list(
      {
        auth: auth,
        pageSize: 10,
        fields: 'nextPageToken, files(id, name)',
      },
      (err, res) => {
        if (err) {
          console.error('The API returned an error.');
          throw err;
        }
        const files = res.data.files;
        if (files.length === 0) {
          console.log('No files found.');
        } else {
          console.log('Files:');
          for (const file of files) {
            console.log(`${file.name} (${file.id})`);
          }
        }
      }
    );
  }
docs: Lists the names and IDs of up to 10 files.
  @param {google.auth.OAuth2} auth An authorized OAuth2 client.