ravicious/child.js

## child.js
const {setTimeout} = require('node:timers/promises')

process.on('SIGTERM', () => {
    console.log('got SIGTERM')
    setTimeout(100).then(() => {
        console.log('Exiting')
        process.exit(0)
    })
})

console.log('running')

setTimeout(10000).then(() => {
    console.log('Timeout ended')
})

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP -->
    <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'">
    <link href="./styles.css" rel="stylesheet">
    <title>Hello World!</title>
  </head>
  <body>
    <h1>Hello World!</h1>
    We are using Node.js <span id="node-version"></span>,
    Chromium <span id="chrome-version"></span>,
    and Electron <span id="electron-version"></span>.

    <!-- You can also require other files to run in this process -->
    <script src="./renderer.js"></script>
  </body>
</html>

## main.js
// Modules to control application life and create native browser window
const { app, BrowserWindow, globalShortcut } = require('electron')
const path = require('node:path')
const {setTimeout} = require('node:timers/promises')
const {fork, spawn, exec} = require('node:child_process')

const childProcess = fork(path.join(__dirname, 'child.js'), [], {stdio: 'pipe'})

childProcess.stdout.on('data', (data) => {
  console.log('child: ' + data)
})

function createWindow () {
  // Create the browser window.
  const mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    x: 250,
    y: 250,
    backgroundColor: 'green',
    minWidth: 490,
    minHeight:300,
    autoHideMenuBar: true,
    webPreferences: {
      preload: path.join(__dirname, 'preload.js'),
      webgl: false,
      enableWebSQL: false,
      safeDialogs: true,
      contextIsolation: true,
      nodeIntegration: false,
      sandbox: false,
    }
  })

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

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()
  mainWindow.once('close', () => {
    const windowState = mainWindow.getNormalBounds()

    setTimeout(500).then(() => {
      console.log(windowState)
    })
  })


}

// 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.whenReady().then(() => {
  createWindow()

  app.on('activate', function () {
    // On macOS 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 (BrowserWindow.getAllWindows().length === 0) createWindow()
  })
})

  app.on('will-quit', async event => {
    event.preventDefault();
    globalShortcut.unregisterAll()
    await setTimeout(200)
    childProcess.kill('SIGTERM')
    await setTimeout(25)
    app.exit();
  });

  app.on('quit', () => {
  });


// 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.

## package.json
{
  "name": "electron-fiddle",
  "productName": "electron-fiddle",
  "description": "My Electron application description",
  "keywords": [],
  "main": "./main.js",
  "version": "1.0.0",
  "author": "rav",
  "scripts": {
    "start": "electron ."
  },
  "dependencies": {},
  "devDependencies": {
    "electron": "28.0.0"
  }
}

## preload.js
/**
 * The preload script runs before. It has access to web APIs
 * as well as Electron's renderer process modules and some
 * polyfilled Node.js functions.
 *
 * https://www.electronjs.org/docs/latest/tutorial/sandbox
 */
window.addEventListener('DOMContentLoaded', () => {
  const replaceText = (selector, text) => {
    const element = document.getElementById(selector)
    if (element) element.innerText = text
  }

  for (const type of ['chrome', 'node', 'electron']) {
    replaceText(`${type}-version`, process.versions[type])
  }
})

## renderer.js
/**
 * This file is loaded via the <script> tag in the index.html file and will
 * be executed in the renderer process for that window. No Node.js APIs are
 * available in this process because `nodeIntegration` is turned off and
 * `contextIsolation` is turned on. Use the contextBridge API in `preload.js`
 * to expose Node.js functionality from the main process.
 */

## styles.css
/* styles.css */

/* Add styles here to customize the appearance of your app */
	const {setTimeout} = require('node:timers/promises')

	process.on('SIGTERM', () => {
	console.log('got SIGTERM')
	setTimeout(100).then(() => {
	console.log('Exiting')
	process.exit(0)
	})
	})

	console.log('running')

	setTimeout(10000).then(() => {
	console.log('Timeout ended')
	})
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	<!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP -->
	<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'">
	<link href="./styles.css" rel="stylesheet">
	<title>Hello World!</title>
	</head>
	<body>
	<h1>Hello World!</h1>
	We are using Node.js <span id="node-version"></span>,
	Chromium <span id="chrome-version"></span>,
	and Electron <span id="electron-version"></span>.

	<!-- You can also require other files to run in this process -->
	<script src="./renderer.js"></script>
	</body>
	</html>
	// Modules to control application life and create native browser window
	const { app, BrowserWindow, globalShortcut } = require('electron')
	const path = require('node:path')
	const {setTimeout} = require('node:timers/promises')
	const {fork, spawn, exec} = require('node:child_process')

	const childProcess = fork(path.join(__dirname, 'child.js'), [], {stdio: 'pipe'})

	childProcess.stdout.on('data', (data) => {
	console.log('child: ' + data)
	})

	function createWindow () {
	// Create the browser window.
	const mainWindow = new BrowserWindow({
	width: 800,
	height: 600,
	x: 250,
	y: 250,
	backgroundColor: 'green',
	minWidth: 490,
	minHeight:300,
	autoHideMenuBar: true,
	webPreferences: {
	preload: path.join(__dirname, 'preload.js'),
	webgl: false,
	enableWebSQL: false,
	safeDialogs: true,
	contextIsolation: true,
	nodeIntegration: false,
	sandbox: false,
	}
	})

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

	// Open the DevTools.
	// mainWindow.webContents.openDevTools()
	mainWindow.once('close', () => {
	const windowState = mainWindow.getNormalBounds()

	setTimeout(500).then(() => {
	console.log(windowState)
	})
	})


	}

	// 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.whenReady().then(() => {
	createWindow()

	app.on('activate', function () {
	// On macOS 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 (BrowserWindow.getAllWindows().length === 0) createWindow()
	})
	})

	app.on('will-quit', async event => {
	event.preventDefault();
	globalShortcut.unregisterAll()
	await setTimeout(200)
	childProcess.kill('SIGTERM')
	await setTimeout(25)
	app.exit();
	});

	app.on('quit', () => {
	});


	// 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.
	{
	"name": "electron-fiddle",
	"productName": "electron-fiddle",
	"description": "My Electron application description",
	"keywords": [],
	"main": "./main.js",
	"version": "1.0.0",
	"author": "rav",
	"scripts": {
	"start": "electron ."
	},
	"dependencies": {},
	"devDependencies": {
	"electron": "28.0.0"
	}
	}
	/**
	* The preload script runs before. It has access to web APIs
	* as well as Electron's renderer process modules and some
	* polyfilled Node.js functions.
	*
	* https://www.electronjs.org/docs/latest/tutorial/sandbox
	*/
	window.addEventListener('DOMContentLoaded', () => {
	const replaceText = (selector, text) => {
	const element = document.getElementById(selector)
	if (element) element.innerText = text
	}

	for (const type of ['chrome', 'node', 'electron']) {
	replaceText(`${type}-version`, process.versions[type])
	}
	})
	/**
	* This file is loaded via the <script> tag in the index.html file and will
	* be executed in the renderer process for that window. No Node.js APIs are
	* available in this process because `nodeIntegration` is turned off and
	* `contextIsolation` is turned on. Use the contextBridge API in `preload.js`
	* to expose Node.js functionality from the main process.
	*/
	/* styles.css */

	/* Add styles here to customize the appearance of your app */