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KeyObject instances can be passed to other threads via postMessage(). The receiver obtains a cloned KeyObject, and the KeyObject does not need to be listed in the transferList argument. const { webcrypto, KeyObject } = await import('crypto'); const { subtle } = webcrypto; const key = await subtle.generateKey({ name: 'HMAC', hash: 'SHA-256', length: 256 }, true, ['sign', 'verify']); const keyObject = KeyObject.from(key); console.log(keyObject.symmetricKeySize); // Prints: 32 (symmetric key size in bytes)const { webcrypto: { subtle, }, KeyObject, } = require('crypto'); (async function() { const key = await subtle.generateKey({ name: 'HMAC', hash: 'SHA-256', length: 256 }, true, ['sign', 'verify']); const keyObject = KeyObject.from(key); console.log(keyObject.symmetricKeySize); // Prints: 32 (symmetric key size in bytes) })(); keyObject.asymmetricKeyDetails#