old_contents: /* eslint import/no-unresolved: 0 */
  import { app } from 'electron';
  import fse from 'fs-extra';
  import { WindowManager, handleStartupEvent, setApplicationMenu } from './desktop';
  import cnc from './cnc';
  import pkg from './package.json';
  
  let windowManager = null;
  
  const main = () => {
      if (handleStartupEvent()) {
          return;
      }
  
      // https://github.com/electron/electron/blob/master/docs/api/app.md#appmakesingleinstancecallback
      const shouldQuit = app.makeSingleInstance((commandLine, workingDirectory) => {
          // Someone tried to run a second instance, we should focus our window.
          if (!windowManager) {
              return;
          }
  
          const window = windowManager.getWindow();
          if (window) {
              if (window.isMinimized()) {
                  window.restore();
              }
              window.focus();
          }
      });
  
      if (shouldQuit) {
          app.quit();
          return;
      }
  
      // Create the user data directory if it does not exist
      const userData = app.getPath('userData');
      fse.mkdirsSync(userData);
  
      app.on('ready', () => {
          cnc({ host: '127.0.0.1', port: 0 }, (err, server) => {
              if (err) {
                  console.error('Error:', err);
                  return;
              }
  
              const address = server.address();
              if (!address) {
                  console.error('Unable to start the server:', address);
                  return;
              }
  
              setApplicationMenu();
  
              windowManager = new WindowManager();
              windowManager.openWindow({
                  title: `${pkg.name} ${pkg.version}`,
                  url: `http://${address.address}:${address.port}`
              });
          });
      });
  };
  
  main();
  
new_contents: /* eslint import/no-unresolved: 0 */
  import { app } from 'electron';
  import mkdirp from 'mkdirp';
  import { WindowManager, handleStartupEvent, setApplicationMenu } from './desktop';
  import cnc from './cnc';
  import pkg from './package.json';
  
  let windowManager = null;
  
  const main = () => {
      if (handleStartupEvent()) {
          return;
      }
  
      // https://github.com/electron/electron/blob/master/docs/api/app.md#appmakesingleinstancecallback
      const shouldQuit = app.makeSingleInstance((commandLine, workingDirectory) => {
          // Someone tried to run a second instance, we should focus our window.
          if (!windowManager) {
              return;
          }
  
          const window = windowManager.getWindow();
          if (window) {
              if (window.isMinimized()) {
                  window.restore();
              }
              window.focus();
          }
      });
  
      if (shouldQuit) {
          app.quit();
          return;
      }
  
      // Create the user data directory if it does not exist
      const userData = app.getPath('userData');
      mkdirp.sync(userData);
  
      app.on('ready', () => {
          cnc({ host: '127.0.0.1', port: 0 }, (err, server) => {
              if (err) {
                  console.error('Error:', err);
                  return;
              }
  
              const address = server.address();
              if (!address) {
                  console.error('Unable to start the server:', address);
                  return;
              }
  
              setApplicationMenu();
  
              windowManager = new WindowManager();
              windowManager.openWindow({
                  title: `${pkg.name} ${pkg.version}`,
                  url: `http://${address.address}:${address.port}`
              });
          });
      });
  };
  
  main();
  
subject: Use mkdirp.sync() instead of fse.mkdirsSync()