static-server.js

#! /usr/bin/env node 

// static-server.js 

const express = require('express') 
const server = express() 

// serve whatever directory you run the command from 
const dir = process.cwd() 
server.use(express.static(dir)) 

// the default port is 3000 

let port = 3000 

// if the last argument passed into the command is a number, 
// use that as the port instead 

// sometimes parsing fails, but we don't want 
// that to halt the program. 
try { 
const lastArgument = process.argv[process.argv.length - 1] 
  const number = JSON.parse(lastArgument) 
  if (typeof number === 'number') port = number 
} catch (e) {} 

server.listen(port) 

console.log(`serving on port ${port}`) 
console.log(dir)