main.js

const {
    app,
    BrowserWindow
} = 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 win

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

    win.webPreferences = {
        nodeIntegration: true
    }

    // and load the index.html of the app.
    win.loadFile("index.html")

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

    // Emitted when the window is closed.
    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
    })
}

// 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)

// Quit when all windows are closed.
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()
    }
})