electron-starter.js

const electron = require('electron');
// Module to control application life.
const app = electron.app;
// Module to create native browser window.
const BrowserWindow = electron.BrowserWindow;

const path = require('path');
const url = require('url');

// keyboard hook
const ioHook = require('iohook');

// 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 mainWindow;

function createWindow() {
    // Create the browser window.
    mainWindow = new BrowserWindow({
        width: 800,
        height: 300,
        transparent: true,
        frame: false,
        alwaysOnTop: true,
    });


    // and load the index.html of the app.
    const startUrl = process.env.ELECTRON_START_URL || url.format({
        pathname: path.join(__dirname, '/../build/index.html'),
        protocol: 'file:',
        slashes: true
    });
    mainWindow.loadURL(startUrl);
    // Open the DevTools.
    mainWindow.webContents.openDevTools();

    // Emitted when the window is closed.
    mainWindow.on('closed', function () {
        // 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.
        mainWindow = null
    })

    // mainWindow.setSimpleFullScreen(true);
    mainWindow.setResizable(false);
    // mainWindow.setIgnoreMouseEvents(true);

    mainWindow.on('keyup', (event) => {
        console.log(event);
    });

    mainWindow.on('keydown', (event) => {
        console.log(event);
    });

}

// 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', function () {
    // On OS X 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 OS X 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 (mainWindow === null) {
        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.

ioHook.on("keyup", event => {
    console.log(event); // {keychar: 'f', keycode: 19, rawcode: 15, type: 'keup'}
 });
 
 ioHook.start();