Cannot use structuredClone on CryptoKey

I am trying to create a WebWorker, and pass a CryptoKey to it. The idea is that the Web Worker should not be able to extract the key, so I generate the key with extractable === false. However, trying to pass a clone of a CryptoKey fails.

According to the MDN, this should be possible.

CryptoKey objects can be stored using the structured clone algorithm, meaning that you can store and retrieve them using standard web storage APIs. The specification expects that most developers will use the IndexedDB API to store CryptoKey objects.

Here is a small snippet that demonstrates the problem. After calling structuredClone an empty object is returned.

const result = await crypto.subtle.generateKey(
  { name: 'AES-CBC', length: 256 },
  false,
  ['encrypt', 'decrypt'],
);

console.log(result);
console.log(structuredClone(result));

denoland / deno

Cannot use structuredClone on CryptoKey #12734