Running polyserve with URL-rewrite middleware

serve.js

const {startServer} = require('polyserve');
const projectConfig = require('./polymer.json');

const serverOptions = {
  compile: projectConfig.compile,
  entryPoint: projectConfig.entryPoint,
  port: 8080,
  root: 'src',
};

(async () => {
  await startServer(serverOptions, (app, options) => {
    app.use((req, res, next) => {
      if (req.url.startsWith('/foo')) {
        req.url = req.url.replace(/^\/foo/, '');
      }
      return next();
    });
    return app;
  });
})();