electron/lib/browser/api/message-channel.ts

import { MessagePortMain } from '@electron/internal/browser/message-port-main'
const { createPair } = process.electronBinding('message_port')

export default class MessageChannelMain {
  port1: MessagePortMain;
  port2: MessagePortMain;
  constructor () {
    const { port1, port2 } = createPair()
    this.port1 = new MessagePortMain(port1)
    this.port2 = new MessagePortMain(port2)
  }
}