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<!DOCTYPE html>
<body>
<script>
const m = new URL('module1.js', location.href).toString();
const observer = new PerformanceObserver(l => {
const entries = l.getEntriesByName(m);
if (entries.length === 1) {
import(m).then(() => {
observer.disconnect();
const all = performance.getEntriesByName(m);
window.parent.postMessage(all.length, '*');
});
}
});
observer.observe({type: 'resource', buffered: true});
</script>
</body>
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