MarshallOfSound/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Hello World!</title>
  </head>
  <body>
    <h1>Hello World!</h1>
    <div></div>

    <script>
      // You can also require other files to run in this process
      require('./renderer.js')
    </script>
  </body>
</html>

## main.js
// Modules to control application life and create native browser window
const {app, BrowserWindow, ipcMain} = require('electron')

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow

function createWindow () {
  // Create the browser window.
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      nodeIntegration: true
    }
  })

  // and load the index.html of the app.
  mainWindow.loadFile('index.html')

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()

  // Emitted when the window is closed.
  mainWindow.on('closed', function () {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null
  })
}

function setup() {

  ipcMain.on('rocket', (event, args) => {
    let startTime = new Date()
    let endTime = startTime;
    console.log(args)
    console.log(`${startTime.toLocaleTimeString()}: Started processing in main process`)
    while(true) {
      if ((endTime = new Date()) > startTime.getTime() + 1000 * 7)
        break
    }
    console.log(`${new Date().toLocaleTimeString()}: Done processing in main process`)
  })

}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', () => {
  createWindow()
  setup()
})
// Quit when all windows are closed.
app.on('window-all-closed', function () {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', function () {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (mainWindow === null) {
    createWindow()
  }
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

## renderer.js
// This file is required by the index.html file and will
// be executed in the renderer process for that window.
// All of the Node.js APIs are available in this process.

const div = document.querySelector('div');
div.style.height = '100vh';
div.style.width = '100vw';
div.style.backgroundColor = 'red';

const run = () => {
    div.style.backgroundColor = div.style.backgroundColor === 'red'
        ? 'blue'
        : 'red'
    setTimeout(run, 100)
}

run()

window.onload = (e) => {
    const { ipcRenderer } = require('electron')
    console.log(`${new Date().toLocaleTimeString()}: Starting. `)
    setTimeout(() => {

        console.log(`${new Date().toLocaleTimeString()}: Sending message to main process. `)
        ipcRenderer.send('rocket', 'Message from renderer...')
        console.log(`${new Date().toLocaleTimeString()}: Message sent to main process.`)
    }, 2000)
}
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>Hello World!</title>
	</head>
	<body>
	<h1>Hello World!</h1>
	<div></div>

	<script>
	// You can also require other files to run in this process
	require('./renderer.js')
	</script>
	</body>
	</html>
	// Modules to control application life and create native browser window
	const {app, BrowserWindow, ipcMain} = require('electron')

	// Keep a global reference of the window object, if you don't, the window will
	// be closed automatically when the JavaScript object is garbage collected.
	let mainWindow

	function createWindow () {
	// Create the browser window.
	mainWindow = new BrowserWindow({
	width: 800,
	height: 600,
	webPreferences: {
	nodeIntegration: true
	}
	})

	// and load the index.html of the app.
	mainWindow.loadFile('index.html')

	// Open the DevTools.
	// mainWindow.webContents.openDevTools()

	// Emitted when the window is closed.
	mainWindow.on('closed', function () {
	// Dereference the window object, usually you would store windows
	// in an array if your app supports multi windows, this is the time
	// when you should delete the corresponding element.
	mainWindow = null
	})
	}

	function setup() {

	ipcMain.on('rocket', (event, args) => {
	let startTime = new Date()
	let endTime = startTime;
	console.log(args)
	console.log(`${startTime.toLocaleTimeString()}: Started processing in main process`)
	while(true) {
	if ((endTime = new Date()) > startTime.getTime() + 1000 * 7)
	break
	}
	console.log(`${new Date().toLocaleTimeString()}: Done processing in main process`)
	})

	}

	// This method will be called when Electron has finished
	// initialization and is ready to create browser windows.
	// Some APIs can only be used after this event occurs.
	app.on('ready', () => {
	createWindow()
	setup()
	})
	// Quit when all windows are closed.
	app.on('window-all-closed', function () {
	// On OS X it is common for applications and their menu bar
	// to stay active until the user quits explicitly with Cmd + Q
	if (process.platform !== 'darwin') {
	app.quit()
	}
	})

	app.on('activate', function () {
	// On OS X it's common to re-create a window in the app when the
	// dock icon is clicked and there are no other windows open.
	if (mainWindow === null) {
	createWindow()
	}
	})

	// In this file you can include the rest of your app's specific main process
	// code. You can also put them in separate files and require them here.
	// This file is required by the index.html file and will
	// be executed in the renderer process for that window.
	// All of the Node.js APIs are available in this process.

	const div = document.querySelector('div');
	div.style.height = '100vh';
	div.style.width = '100vw';
	div.style.backgroundColor = 'red';

	const run = () => {
	div.style.backgroundColor = div.style.backgroundColor === 'red'
	? 'blue'
	: 'red'
	setTimeout(run, 100)
	}

	run()

	window.onload = (e) => {
	const { ipcRenderer } = require('electron')
	console.log(`${new Date().toLocaleTimeString()}: Starting. `)
	setTimeout(() => {

	console.log(`${new Date().toLocaleTimeString()}: Sending message to main process. `)
	ipcRenderer.send('rocket', 'Message from renderer...')
	console.log(`${new Date().toLocaleTimeString()}: Message sent to main process.`)
	}, 2000)
	}