Configure an express server.js

// Express is a minimalist web framework for Node.js.

// To get a server up and running there are a few steps you have to follow.

// Install express npm install express --save
// Require express on a file var express = require('express');
// Get the app from express by invoking it var app = express();
// Start the server with the app's listen function
// The listen function will start a server that you are going to be able to use through the browser.

// It has different signature methods, the one you are going to use in this kata is (port, host, callback)

// Your Task
// Inside the solution function you have to require express and start a server.

// The PORT and HOST are going to be pre-loaded in the process.env object (in a node application process.env stores the environment configuration).

// process.env = {
//   PORT: 3000,
//   HOST: '0.0.0.0',
// };

const solution = () => {
    var express = require('express');
    var app = express();
    
    app.listen(process.env.PORT, process.env.HOST, ()=>{})
  };