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self.addEventListener('message', e => {
URL.revokeObjectURL(e.data.url);
// Registering a new object URL will make absolutely sure that the revocation
// has propagated. Without this at least in chrome it is possible for the
// below postMessage to arrive at its destination before the revocation has
// been fully processed.
URL.createObjectURL(new Blob([]));
self.postMessage('revoked');
});
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