server.js

var http = require("http"),
    url = require("url"),
    path = require("path"),
    fs = require("fs"),
    shell = require("shelljs"),
    port = process.argv[2] || 8888;



http.createServer(function(request, response) {
  var uri = url.parse(request.url).pathname,
    filename = path.join(process.cwd(), uri);
  console.log(uri, filename);
  

  fs.exists(filename, function(exists) {
    if(!exists) {
      response.writeHead(404, {"Content-Type": "text/plain"});
      response.write("404 Not Found\n");
      response.end();
      return;
    }

    if (fs.statSync(filename).isDirectory()) filename += '/index.html';

    fs.readFile(filename, "binary", function(err, file) {
      if(err) {        
        response.writeHead(500, {"Content-Type": "text/plain"});
        response.write(err + "\n");
        response.end();
        return;
      }

      concatScript();
      response.writeHead(200);
      response.write(file, "binary");
      response.end();
      });
    });
}).listen(parseInt(port, 10));

console.log("Static file server running at\n  => http://localhost:" + port + "/\nCTRL + C to shutdown");

function concatScript() {
  const scriptNames = [
    'setup.js',
    'NetworkWrapper.js',
    'helper.js',
    'classes.js',
    'levels.js',
    'gameloop.js'
  ];
  const scrdir = 'scripts/';
  let scriptPaths = scriptNames.map(s => scrdir + s);
  let scriptPayload = shell.cat(scriptPaths).stdout;
  // write scriptPayload to disk as script.js
  fs.writeFile('script.js', scriptPayload, (err) => {
    if (err)
      throw err;
    console.log('scripts concatenated.');
  });
  console.log(typeof scriptPayload);
}