text: const fs = require('fs');
  const nhdl = require('nhentaidownloader');
  var args = process.argv.slice(2);
  if (!args[0] || args[0].match(/[^0-9]/g)) throw Error('First argrument must be number and valid nhentai ID.');
  
  var ID = args[0];
  
  nhdl(ID).then(buffer => {
    fs.writeFileSync(`./${ID}.zip`, buffer);
  });
  