index.js

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

function createWindow() {
  let win = new BrowserWindow({
    width: 8,
    height: 8,
    x: 0,
    y: 0,
    frame: false,
    transparent: true,
    hasShadow: false,
    alwaysOnTop: true,
    resizable: false,
    show: true,
    skipTaskbar: true,
    dock: false,
    webPreferences: {
      nodeIntegration: false,
      contextIsolation: true
    }
  });

  win.loadFile('index.html');

  win.setIgnoreMouseEvents(true);
  // win.setHiddenInMissionControl(true);
  win.setAlwaysOnTop(true);
  win.setVisibleOnAllWorkspaces(true, { visibleOnFullScreen: true, skipTransformProcessType: true });
  win.setOpacity(0.01);
}

app.whenReady().then(() => {
  if (process.platform === 'darwin') {
    app.dock.hide();
  }
  createWindow();
});

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit();
  }
});