const ipc = require('electron').ipcRenderer
const asyncMsgBtn = document.getElementById('async-msg')
asyncMsgBtn.addEventListener('click', function () {
ipc.send('asynchronous-message', 'ping')
})
ipc.on('asynchronous-reply', function (event, arg) {
const message = `Asynchronous message reply: ${arg}`
document.getElementById('async-reply').innerHTML = message
})