#I don't understand how to solve this problem — Page 1

const { createWriteStream } = require('fs');
const { Bar } = require('cli-progress');
const ytdl = require('ytdl-core');
const ffmpeg = require('fluent-ffmpeg');

async function downloadAudio(url, filename, format) 
  let downloadPath = '/storage/emulated/0/Download/';
  const fullPath = downloadPath + filename;
  const progressBarFormat = `{bar} {percentage}% | ETA: {eta}s | Загрузка`;

  if (url.includes('youtube.com')) {
    const video = ytdl(url);
    const progressBar = new Bar({}, { format: progressBarFormat });

    progressBar.start(100, 0);

    const audio = ffmpeg(video)
      .format(format)
      .on('progress', (progress) => {
        const percentage = progress.percent * 0.01;
        const value = percentage * 100;
        progressBar.update(value);
      })
      .on('error', (error) => {
        console.error(error);
      });

    audio.pipe(createWriteStream(fullPath));

    await new Promise((resolve, reject) => {
      audio.on('end', () => {
        progressBar.stop();
        console.log(`Аудиофайл успешно загружен в ${downloadPath}!`);
        resolve();
      });
    });
  } else if (url.includes('music.youtube.com')) {
    const { videoDetails } = await ytdl.getInfo(url);
    const stream = ytdl.downloadFromInfo(videoDetails, { filter: 'audioonly' });
    const progressBar = new Bar({}, { format: progressBarFormat });

    progressBar.start(100, 0);

    stream.on('progress', (chunkLength, downloaded, total) => {
      const percentage = downloaded / total;
      const value = percentage * 100;
      progressBar.update(value);
    });

    stream.pipe(createWriteStream(fullPath));

    await new Promise((resolve, reject) => {
      stream.on('end', () => {
        progressBar.stop();
        console.log(`Аудиофайл успешно загружен в ${downloadPath}!`)
        
      )};
    };
};
module.exports(download
```Audio);