main.js

// This is free and unencumbered software released into the public domain.
// See LICENSE for details

const {app, BrowserWindow} = require('electron');
const log = require('electron-log');
const {autoUpdater} = require("electron-updater");

//-------------------------------------------------------------------
// Logging
//-------------------------------------------------------------------
autoUpdater.logger = log;
autoUpdater.logger.transports.file.level = 'info';
log.info('App starting...');

//-------------------------------------------------------------------
// configure auto updater event listeners
//-------------------------------------------------------------------

function sendStatusToWindow(text) {
    log.info(text);
    win.webContents.send('message', text);
}

autoUpdater.on('checking-for-update', function () {
    sendStatusToWindow('Checking for update...');
});
autoUpdater.on('update-available', function () {
    sendStatusToWindow('Update available.');
});
autoUpdater.on('update-not-available', function () {
    sendStatusToWindow('Update not available.');
});
autoUpdater.on('error', function (error) {
    sendStatusToWindow(JSON.stringify(error));
});
autoUpdater.on('download-progress', function (progressObj) {
    let log_message = "Download speed: " + progressObj.bytesPerSecond;
    log_message = log_message + ' - Downloaded ' + progressObj.percent + '%';
    log_message = log_message + ' (' + progressObj.transferred + "/" + progressObj.total + ')';
    sendStatusToWindow(log_message);
});
autoUpdater.on('update-downloaded', function () {
    sendStatusToWindow('Update downloaded; will install in 5 seconds');
});
autoUpdater.on('update-downloaded', function () {
    // Wait 5 seconds, then quit and install
    setTimeout(function () {
            autoUpdater.quitAndInstall();
        }, 5000
    );
});

//-------------------------------------------------------------------
// Open a window that displays the version
//-------------------------------------------------------------------
let win;

function createDefaultWindow() {
    win = new BrowserWindow();
    win.setMenu(null);
    win.on('closed', function () {
        win = null;
    });
    win.loadURL(`file://${__dirname}/filebrowser/dist/index.html`);
    return win;
}

app.on('ready', function () {
    createDefaultWindow();
    autoUpdater.checkForUpdates();
    // setTimeout(() => sendStatusToWindow('I\'m just a message to demonstrate, how to show notifications in Electron.'), 3000);

});
app.on('window-all-closed', function () {
    app.quit();
});