atom/src/main-process/context-menu.js

const {Menu} = require('electron')

module.exports =
class ContextMenu {
  constructor (template, atomWindow) {
    this.atomWindow = atomWindow
    this.createClickHandlers(template)
    const menu = Menu.buildFromTemplate(template)
    menu.popup(this.atomWindow.browserWindow, {async: true})
  }

  // It's necessary to build the event handlers in this process, otherwise
  // closures are dragged across processes and failed to be garbage collected
  // appropriately.
  createClickHandlers (template) {
    template.forEach(item => {
      if (item.command) {
        if (!item.commandDetail) item.commandDetail = {}
        item.commandDetail.contextCommand = true
        item.commandDetail.atomWindow = this.atomWindow
        item.click = () => {
          global.atomApplication.sendCommandToWindow(
            item.command,
            this.atomWindow,
            item.commandDetail
          )
        }
      } else if (item.submenu) {
        this.createClickHandlers(item.submenu)
      }
    })
  }
}