example.js

telegram.getUserProfilePhotos(user.id, 0, 1).then((response) => {
  const photos = response.photos;
  const photo = photos[0];
  const largePhoto = photo[2];

  telegram.getFileLink(largePhoto.file_id).then((avatarLink) => {
    axios.get(avatarLink).then((avatar) => {
      const form = new FormData();
      form.append('data', new Buffer.from(avatar.data), {
        filename: 'example.jpg',
      });

      return new Promise((resolve, reject) => {
        form.submit('https://telegra.ph/upload', (err, res) => {
          if (err) return reject(err);
          let data = '';

          const onData = chunk => {
            data += chunk;
          };

          const onEnd = () => {
            res.removeListener('data', onData);
            res.removeListener('error', reject);
            res.removeListener('end', onEnd);

            console.log(JSON.parse(data));

            resolve(JSON.parse(data));
          };

          res.on('data', onData);
          res.on('end', onEnd);
          res.on('error', reject);
        });
      });
    });
  });
});