main.js

// Modules to control application life and create native browser window
const { app, BrowserWindow, Menu } = require('electron')
require('electron-reload')(__dirname);
const path = require('path')

function createWindow() {
    // Create the browser window.
    const mainWindow = new BrowserWindow({
        width: 400,
        height: 360,
        resizable: false,
        webPreferences: {
            preload: path.join(__dirname, 'preload.js')
        }
    })

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

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

// 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', function () {
    createWindow()

    const menuTemplate = [
        {
            label: 'Arquivo',
            submenu: [
                {
                    label: 'Sair',
                    click: function () {
                        app.quit()
                    }
                }
            ]
        },
        {
            label: 'Ajuda',
        }
    ]

    const menu = Menu.buildFromTemplate(menuTemplate)
    Menu.setApplicationMenu(menu)
})

// Quit when all windows are closed.
app.on('window-all-closed', function () {
    // 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', 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()
})

// 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.