text: const express = require('express');
  const app = express();
  const portNumber = 3000;
  
  const sourceDir = 'dist';
  
  app.use(function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    next();
  });
  
  app.use(express.static('src/assets'));
  app.use(express.static(sourceDir));
  
  if (portNumber) {
    app.listen(portNumber, (err) => {
      if (err) {
        console.error(err);
      }
      console.info("----\n==> 🌎  %s is running, talking to API server on %s.", "APlayVR", portNumber);
      console.info("==> 💻  Open http://%s:%s in a browser to view the app.", "localhost", portNumber);
    });
  } else {
    console.error("==>     ERROR: No PORT environment variable has been specified");
  }