text: /// <reference types="@vertx/core" />
  // @ts-check
  
  vertx
    .createHttpServer()
    .requestHandler(function (req) {
      req.response().end("Hello ES4X!");
    })
    .listen(3000, '0.0.0.0');
  
  console.log(`🚀 server listening on 0.0.0.0:3000!`);
  