GeezerVison

const alice = await crypto.subtle.generateKey({ name: 'ECDH', namedCurve: 'P-256' }, false, ['deriveKey']);

const bob = await crypto.subtle.generateKey({ name: 'ECDH', namedCurve: 'P-256' }, false, ['deriveKey']);

const alice_ecdh_params = { name: 'ECDH', public: bob.publicKey };
const alice_shared_key = await crypto.subtle.deriveKey(alice_ecdh_params, alice.privateKey, 'HKDF', false, ['deriveKey']);

TypeError [ERR_INVALID_ARG_TYPE]: The "length" argument must be of type number. Received undefined
    at __node_internal_captureLargerStackTrace (node:internal/errors:465:5)
    at new NodeError (node:internal/errors:372:5)
    at __node_internal_ (node:internal/validators:103:13)
    at Object.asyncDeriveBitsECDH (node:internal/crypto/diffiehellman:435:5)
    at SubtleCrypto.deriveKey (node:internal/crypto/webcrypto:184:10)
    at REPL10:1:83 {
  code: 'ERR_INVALID_ARG_TYPE'