How to use the @aws-crypto/serialize.Maximum.FRAME_SIZE function in @aws-crypto/serialize

export async function encrypt (
  cmm: KeyringWebCrypto|WebCryptoMaterialsManager,
  plaintext: Uint8Array,
  { suiteId, encryptionContext = {}, frameLength = FRAME_LENGTH }: EncryptInput = {}
): Promise {
  /* Precondition: The frameLength must be less than the maximum frame size for browser encryption. */
  needs(frameLength > 0 && Maximum.FRAME_SIZE >= frameLength, `frameLength out of bounds: 0 > frameLength >= ${Maximum.FRAME_SIZE}`)

  const backend = await getWebCryptoBackend()
  if (!backend) throw new Error('No supported crypto backend')

  /* If the cmm is a Keyring, wrap it with WebCryptoDefaultCryptographicMaterialsManager. */
  cmm = cmm instanceof KeyringWebCrypto
    ? new WebCryptoDefaultCryptographicMaterialsManager(cmm)
    : cmm

  // Subtle Crypto functions are all one-shot so all the plaintext needs to be available.
  const plaintextLength = plaintext.byteLength
  const suite = suiteId ? new WebCryptoAlgorithmSuite(suiteId) : new WebCryptoAlgorithmSuite(AlgorithmSuiteIdentifier.ALG_AES256_GCM_IV12_TAG16_HKDF_SHA384_ECDSA_P384)

  const encryptionRequest: WebCryptoEncryptionRequest = {
    suite,
    encryptionContext,

export function encryptStream (
  cmm: KeyringNode|NodeMaterialsManager,
  op: EncryptStreamInput = {}
): Duplex {
  const { suiteId, encryptionContext = {}, frameLength = FRAME_LENGTH, plaintextLength } = op

  /* Precondition: The frameLength must be less than the maximum frame size Node.js stream. */
  needs(frameLength > 0 && Maximum.FRAME_SIZE >= frameLength, `frameLength out of bounds: 0 > frameLength >= ${Maximum.FRAME_SIZE}`)

  /* If the cmm is a Keyring, wrap it with NodeDefaultCryptographicMaterialsManager. */
  cmm = cmm instanceof KeyringNode
    ? new NodeDefaultCryptographicMaterialsManager(cmm)
    : cmm

  const suite = suiteId && new NodeAlgorithmSuite(suiteId)

  const wrappingStream = new Duplexify()

  cmm.getEncryptionMaterials({ suite, encryptionContext, plaintextLength })
    .then(async (material) => {
      const { dispose, getSigner } = getEncryptHelper(material)

      const { getCipher, messageHeader, rawHeader } = getEncryptionInfo(material, frameLength)