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import WORKER_SHIM from './sandbox-worker.js?raw';
/**
* Harness loaded as srcdoc into a sandboxed iframe (allow-scripts only).
* The opaque origin is the security boundary: no access to the app origin,
* its storage or its API. The harness spawns a worker so model code never
* runs on a main thread, which makes the parent timeout enforceable by
* removing the iframe.
*/
export const SANDBOX_HARNESS_HTML = `<!doctype html><script>
const SHIM = ${JSON.stringify(WORKER_SHIM)};
addEventListener('message', (event) => {
const respond = (payload) => parent.postMessage(payload, '*');
let worker;
try {
worker = new Worker(URL.createObjectURL(new Blob([SHIM], { type: 'text/javascript' })));
} catch (err) {
respond({ logs: [], result: null, error: 'Worker creation failed: ' + err });
return;
}
worker.onmessage = (msg) => respond(msg.data);
worker.onerror = (err) => respond({ logs: [], result: null, error: String(err.message || err) });
worker.postMessage({ code: event.data.code });
});
</script>`;

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