coco_playgame/scripts/preview-server.mjs

import { createReadStream, existsSync, statSync } from 'node:fs';
import { createServer } from 'node:http';
import { extname, join, normalize } from 'node:path';

const root = process.cwd();
const port = Number(process.env.PORT || 4173);
const mime = {
  '.html': 'text/html; charset=utf-8',
  '.js': 'text/javascript; charset=utf-8',
  '.css': 'text/css; charset=utf-8',
  '.json': 'application/json; charset=utf-8',
  '.png': 'image/png'
};

createServer((req, res) => {
  const raw = decodeURIComponent((req.url || '/').split('?')[0]);
  const safe = normalize(raw).replace(/^(\.\.[/\\])+/, '');
  let file = join(root, safe === '/' ? '/web/index.html' : safe);
  if (existsSync(file) && statSync(file).isDirectory()) file = join(file, 'index.html');
  if (!existsSync(file)) {
    res.writeHead(404);
    res.end('Not found');
    return;
  }
  res.writeHead(200, { 'content-type': mime[extname(file)] || 'application/octet-stream' });
  createReadStream(file).pipe(res);
}).listen(port, () => {
  console.log(`Steel Assault Rift preview: http://localhost:${port}/web/index.html`);
});