gelectron/demo/main.js

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

let mainWindow = null;

const gotLock = app.requestSingleInstanceLock();
if (!gotLock) {
  app.quit();
} else {
  app.on('second-instance', () => {
    if (mainWindow) {
      if (mainWindow.isMinimized()) mainWindow.restore();
      mainWindow.show();
      mainWindow.focus();
    }
  });

  app.whenReady().then(() => {
    mainWindow = new BrowserWindow({
      width: 900,
      height: 680,
      title: 'Gelectron Demo',
      backgroundColor: '#1a1a2e',
      webPreferences: {
        contextIsolation: true,
        nodeIntegration: false,
      },
    });

    mainWindow.loadFile(path.join(__dirname, 'index.html'));

    mainWindow.once('ready-to-show', () => {
      mainWindow.show();
    });

    mainWindow.on('closed', () => {
      mainWindow = null;
    });
  });

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