File: revoke-helper.js

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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');
});