main.js

const {app, BrowserWindow} = require('electron')

if (handleSquirrelEvent(app)) {
    // squirrel event handled and app will exit in 1000ms, so don't do anything else
    return;
}
const url = require('url')
const path = require('path')

let win

function createWindow() {
   win = new BrowserWindow({width: 1600, height: 800, icon: __dirname+'/assets/img/app_icon.png'})
   win.loadURL(url.format({
      pathname: path.join(__dirname, 'index.html'),
      protocol: 'file:',
      slashes: true
   }))
   win.openDevTools()
   win.on('closed', () => {
   // 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.
   win = null
 })
}

app.on('ready', createWindow)
app.on('window-all-closed', () => {
  // On macOS 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', () => {
  // 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 (win === null) {
    createWindow()
  }
})


function handleSquirrelEvent(application) {
    if (process.argv.length === 1) {
        return false;
    }

    const ChildProcess = require('child_process');
    const path = require('path');

    const appFolder = path.resolve(process.execPath, '..');
    const rootAtomFolder = path.resolve(appFolder, '..');
    const updateDotExe = path.resolve(path.join(rootAtomFolder, 'Update.exe'));
    const exeName = path.basename(process.execPath);

    const spawn = function(command, args) {
        let spawnedProcess, error;

        try {
            spawnedProcess = ChildProcess.spawn(command, args, {
                detached: true
            });
        } catch (error) {}

        return spawnedProcess;
    };

    const spawnUpdate = function(args) {
        return spawn(updateDotExe, args);
    };

    const squirrelEvent = process.argv[1];
    switch (squirrelEvent) {
        case '--squirrel-install':
        case '--squirrel-updated':
            // Optionally do things such as:
            // - Add your .exe to the PATH
            // - Write to the registry for things like file associations and
            //   explorer context menus

            // Install desktop and start menu shortcuts
            spawnUpdate(['--createShortcut', exeName]);

            setTimeout(application.quit, 1000);
            return true;

        case '--squirrel-uninstall':
            // Undo anything you did in the --squirrel-install and
            // --squirrel-updated handlers

            // Remove desktop and start menu shortcuts
            spawnUpdate(['--removeShortcut', exeName]);

            setTimeout(application.quit, 1000);
            return true;

        case '--squirrel-obsolete':
            // This is called on the outgoing version of your app before
            // we update to the new version - it's the opposite of
            // --squirrel-updated

            application.quit();
            return true;
    }
};