Unknown Error of using 'watchify' npm package

const ytdl = require('ytdl-core');
const search = require('yt-search');
const { getInfo, play, showInfo } = require('./helper.js');

// Get HTML elements
const searchResult = document.getElementsByClassName('result');
const searchInput = document.getElementById('searchInput');

// Do all the functions
searchInput.addEventListener('keyup', async (ev) => {
  let results = await getInfo(searchInput);
  
  await showInfo(results);
});

const ytdl = require('ytdl-core');
const search = require('yt-search');
const { getInfo, play, showInfo } = require('./helper.js');

// Get HTML elements
const searchResult = document.getElementsByClassName('result');
const searchInput = document.getElementById('searchInput');

// Do all the functions
searchInput.addEventListener('keyup', async (ev) => {
  let results = await getInfo(searchInput);
  
  await showInfo(results);
});