Electron - prevent multiple instances of the program to spawn.

electon.js

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

// This should be placed at the top of your main process script
const gotTheLock = app.requestSingleInstanceLock();

if (!gotTheLock) {
  // If we don't get the lock, quit immediately as another instance is running
  app.quit();
} else {
  app.on('second-instance', (event, commandLine, workingDirectory) => {
    // Someone tried to run a second instance, we should focus our window.
    if (myWindow) {
      if (myWindow.isMinimized()) myWindow.restore();
      myWindow.focus();
    }
  });

  // Create myWindow, load the rest of the app, etc...
  app.on('ready', () => {
    // Your code to create the browser window, etc.
    let myWindow = new BrowserWindow({/* Your configurations here */});
  });
}