text: const express = require('express');
  const app = express();
  const portNumber = 3000;
  const sourceDir = 'public';
  
  app.use(express.static(sourceDir));
  
  app.listen(portNumber, () => {
  	console.log(`Express web server started: http://localhost:${portNumber}`);
  	console.log(`Serving content from /${sourceDir}/`);
  });
  