electron-eventbus.js

const EventEmitter = require('events')
const electron = require('electron')

export default class EventBus extends EventEmitter {
  constructor(name='default') {
    super()
    this._name = name
    this._baseEventKey = `EventBus-${name}:`
  }

  on(event, listender) {
    const ipc = electron.ipcMain || electron.ipcRenderer
    ipc.on(this._baseEventKey + event, (e, argsJson) => {
      const args = JSON.parse(argsJson)
      return listender && listender(...args)
    })
    return super.on(event, listender)
  }

  emit(event, ...args) {
    const webContents = electron.webContents
    const remote = electron.remote
    const ipcRenderer = electron.ipcRenderer
    const allContents = webContents.getAllWebContents()
    const ipcArgs = [this._baseEventKey + event, JSON.stringify(Array.from(args))]

    if (electron.ipcRenderer) { // renderer process
      const curContents = remote.getCurrentWebContents()
      allContents
        .filter(contents => contents.id !== curContents.id)
        .forEach(contents => contents.send(...ipcArgs))
      ipcRenderer.send()
    } else { // main process
      allContents
        .forEach(contents => contents.send(...ipcArgs))
    }

    return super.emit(event, ...args)
  }
}