Path 2: Remote Isolation

main.js

// ==============
// Main process
// ==============
const {BrowserWindow} = require('electron');

const mainWindow = new BrowserWindow({
  width: 800,
  height: 800,
  webPreferences: {
    preload: './path/to/preload/script.js',
    nodeIntegration: false,
    contextIsolation: true,
    // ...
  }
});
mainWindow.loadURL('https://<remote-web-app-goes-here>');

preload.js

// ==============
// Preload script
// ==============
const {remote} = require('electron');

window.interop = {
  setBadgeCount(count) {
    return remote.app.setBadgeCount(count);
  }
};

remote-web-app.js

// ==============
// Guest page (remote web app)
// ==============
if (window.interop) window.interop.setBadgeCount(9001);