Electron | TypeError: "x" is not a constructor - node.js

Question

I have a simple electron app that opens a browser window to a url of a webpage.
I import my stuff using
const { BrowserWindow, app, MessageChannelMain } = require('electron');
I create my window on app.on("ready") using window = new BrowserWindow({ ... }); and everything works fine.
When I try to create a MessageChannelMain using const {port1, port2} = new MessageChannelMain();, I get the error:
TypeError: MessageChannelMain is not a constructor.
Full code:
function init_window(){
if ( mainWindow == null ) {
mainWindow = create_window();
load_window(); // calls mainWindow.loadURL(myURL);
const {port1, port2} = new MessageChannelMain();
port2.postMessage({ test: 21 })
port2.on('message', (event) => {
console.log('from renderer main world:', event.data)
});
port2.start();
mainWindow.webContents.postMessage('main-world-port', null, [port1])
mainWindow.on('closed', function(event) {
mainWindow = null;
});
mainWindow.webContents.on("did-fail-load", function(event) {
})
}
}
function create_window() {
return new BrowserWindow({
width: 1200,
height: 800,
darkTheme: true,
webPreferences: {
contextIsolation: true,
preload: path.join(__dirname, 'preload.js'),
},
});
}
When I console.log(MessageChannelMain); I get undefined.
At the same time, I get other errors when I try to use some electron stuff on the preload script:
const { contextBridge, ipcRenderer } = require('electron')
contextBridge.exposeInMainWorld(
'electron',
{
doThing: () => ipcRenderer.send('do-a-thing')
}
)
Here I am getting TypeError: Cannot read property 'exposeInMainWorld' of undefined