mattermost-desktop/scripts/watch_main_and_preload.js

// Copyright (c) 2015-2016 Yuya Ochiai
// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
const webpack = require('webpack');
const electron = require('electron-connect').server.create({path: 'src'});

const mainConfig = require('../webpack.config.main.js');
const rendererConfig = require('../webpack.config.renderer.js');

let started = false;

const mainCompiler = webpack(mainConfig);
mainCompiler.watch({}, (err, stats) => {
  process.stdout.write(stats.toString({colors: true}));
  process.stdout.write('\n');
  if (!stats.hasErrors()) {
    if (started) {
      electron.restart();
    } else {
      electron.start();
      started = true;
    }
  }
});

for (const key in rendererConfig.entry) {
  if (!key.startsWith('webview/')) {
    if ({}.hasOwnProperty.call(rendererConfig.entry, key)) {
      delete rendererConfig.entry[key];
    }
  }
}
const preloadCompiler = webpack(rendererConfig);
preloadCompiler.watch({}, (err) => {
  if (err) {
    console.log(err);
  }
});