Node js static http server

index.js

const chalk = require('chalk');
const fs = require('fs');
const http = require('http');
const path = require('path');
const url = require('url');

const mimeType = {
  '.html': 'text/html',
  '.js': 'text/javascript',
  '.css': 'text/css',
  '.svg': 'image/svg+xml'
};

const colors = {
  fail: chalk.red.bold,
  success: chalk.green
};

const staticHandler = (req, res) => {
  let filename = decodeURI(url.parse(req.url).pathname);
  let pathname = path.join(__dirname, 'dist', filename);

  const logPrefix = `${chalk.yellow(req.method)} ${chalk.blueBright(req.url)} ->`;

  fs.exists(pathname, (exists) => {
    if (!exists) {
      console.log(logPrefix, colors.fail('404'));

      res.statusCode = 404;
      res.end('Not Found!');

      return;
    }

    if (fs.statSync(pathname).isDirectory()) {
      pathname = path.join(pathname, 'index.html');
    }

    fs.readFile(pathname, (error, data) => {
      if (error) {
        console.log(logPrefix, colors.fail('500', error.toString()));

        res.statusCode = 500;
        res.end(`Error getting the file:${error}`);
      } else {
        const extension = path.parse(pathname).ext;

        console.log(logPrefix, colors.success(path.relative(__dirname, pathname)));

        res.setHeader('Content-Type', mimeType[extension] || 'text/plain');
        res.end(data);
      }
    });
  });
};

http
  .createServer(staticHandler)
  .listen(8080);