Node.js script to be run daily for achiving YouTube videos in a specified channel list

youtube_channel_achiving.js

const fs = require('fs');
const execSync = require('child_process').execSync;

const CHANNELS_PER_RUN = 8;

function appendLog(string) {
  fs.appendFileSync('log.txt', `${new Date().toUTCString()} - ${string}\n`, () => {});
}

let channels = fs.readFileSync('channels.txt', 'utf8');
channels = channels.split('\n').map(line => line.split(' ')[0]).filter(line => line != '').filter(line => line[0] != '#');

for (let i = 0; i < CHANNELS_PER_RUN; i++) {
  if (channels.length === 0) {
    appendLog('Stopping as all channels are exhausted');
  }
  let channel = channels.splice(Math.floor(Math.random() * channels.length), 1);
  appendLog(`Archiving channel ${channel}`);
  console.log('Working');
  let command = `youtube-dl -i --write-thumbnail --write-info-json --download-archive ARCHIVED.txt -f 'bestvideo[ext=mp4][height<=1080]+bestaudio[ext=m4a]/best[ext=mp4]' --merge-output-format mp4 -o "%(uploader)s/%(upload_date)s %(title)s" --sleep-interval 10 ${channel} > last_output.txt`;
  
  try {
    execSync(command);
  } catch (error) {
    appendLog(`Terminating due to error ` + error);
    break;
  }
}

appendLog('Finished run!');