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import {createServer} from 'node:http';

import {readFile} from 'node:fs/promises';

import {resolve,extname} from 'node:path';

import {fileURLToPath} from 'node:url';

const types={'.html':'text/html; charset=utf-8','.js':'text/javascript; charset=utf-8','.json':'application/json','.css':'text/css','.xml':'application/xml','.png':'image/png'};

export function createPreviewServer(directory) {

const root=resolve(directory);

return createServer(async(req,res)=>{

try{

const path=decodeURIComponent(new URL(req.url,'http://localhost').pathname);

let file=resolve(root,'.'+path);

if(file!==root&&!file.startsWith(root+'/')){res.writeHead(403);res.end();return;}

if(path.endsWith('/'))file=resolve(file,'index.html');

// Read once, without a separate file check that could become stale.

const bytes=await readFile(file);

res.writeHead(200,{'Content-Type':types[extname(file)]||'application/octet-stream','Cache-Control':'no-store'});res.end(bytes);

}catch{res.writeHead(404);res.end('Not found');}

});

}

if(process.argv[1] && resolve(process.argv[1])===fileURLToPath(import.meta.url)) {

createPreviewServer('dist').listen(8766,'127.0.0.1',()=>console.log('Preview http://127.0.0.1:8766 — browser review only; Outlook needs HTTPS.'));

}