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preview-server.mjs

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import http from 'node:http'; import fs from 'node:fs';
const html=fs.readFileSync(new URL('./preview.html',import.meta.url));
const srv=http.createServer((_,res)=>{res.writeHead(200,{'content-type':'text/html'});res.end(html);});
srv.listen(0,()=>console.log('PREVIEW: http://127.0.0.1:'+srv.address().port));