Webpack + Discord.js + Electron

I ran into a problem while building a webpack.

Discord client is not initialized.

This is my first application on Electron. Help please.

Error: Uncaught TypeError: i (...). Client is not a constructor in webpack file.

I ask for help, I will be very glad for a good answer. Below I will provide the code of all files. this problem look like in browser

main.js

const path = require('path');
const url = require('url');
const {app,BrowserWindow} = require('electron');
const {sendMessage,isValidForm} = require('./back.js');


let win;

function createWindow() {
    win = new BrowserWindow({
        width: 1200,
        height : 800,
        icon : __dirname + "/img/icon.png"
    });

    win.loadURL(url.format({
        pathname: path.join(__dirname,"/html/index.html"),
        protocol: 'file:',
        slashes: true
    }));

    win.webContents.openDevTools();

    win.on('closed', () => {
        win = null;
    });
}

app.on('ready', createWindow);

app.on('window-all-closed',() => {
    app.quit();
});

webpack.config.js

var path = require('path');
  module.exports = {
    entry: './src/components/main.js',
    output: {
      filename: 'bundle.js',
      path: path.resolve(__dirname, 'dist')
    },
    externals: [
      (function () {
        var IGNORES = [
          'electron',
          'fs'
        ];
        return function (context, request, callback) {
          if (IGNORES.indexOf(request) >= 0) {
            return callback(null, "require('" + request + "')");
          }
          return callback();
        };
      })()
    ]
  }; 

back.js

const Discord = require('discord.js');
const bot = new Discord.Client();


bot.login("token")
function isValidForm (first,second) {
    if(first.value == "" || second.value == "") {
        return alert('Одна из форм не заполненна')
    }
    sendMessage(first.value, second.value);
}

function sendMessage (channelName,message) {
    const channel = bot.channels.cache.find(ch => ch.name === channelName);
    if(!channel) {
        return alert("Канал с таним названием не найден!");
    }
    channel.send(message);
}

module.exports = {sendMessage,isValidForm};