How to use the @aws-crypto/material-management-node.unwrapDataKey function in @aws-crypto/material-management-node

const _wrapKey = async (material: NodeEncryptionMaterial) => {
      /* Precondition: Public key must be defined to support encrypt. */
      if (!publicKey) throw new Error('No public key defined in constructor.  Encrypt disabled.')
      const { buffer, byteOffset, byteLength } = unwrapDataKey(material.getUnencryptedDataKey())
      const encryptedDataKey = publicEncrypt(
        { key: publicKey, padding },
        Buffer.from(buffer, byteOffset, byteLength))
      const providerInfo = this.keyName
      const providerId = this.keyNamespace
      const flag = KeyringTraceFlag.WRAPPING_KEY_ENCRYPTED_DATA_KEY
      const edk = new EncryptedDataKey({ encryptedDataKey, providerInfo, providerId })
      return material.addEncryptedDataKey(edk, flag)
    }

function aesGcmWrapKey (
  keyNamespace: string,
  keyName: string,
  material: NodeEncryptionMaterial,
  aad: Buffer,
  wrappingMaterial: NodeRawAesMaterial
): NodeEncryptionMaterial {
  const { encryption, ivLength } = wrappingMaterial.suite
  const iv = randomBytes(ivLength)

  const wrappingDataKey = wrappingMaterial.getUnencryptedDataKey()
  const dataKey = unwrapDataKey(material.getUnencryptedDataKey())

  const cipher = createCipheriv(encryption, wrappingDataKey, iv)
    .setAAD(aad)
  // Buffer.concat will use the shared buffer space, and the resultant buffer will have a byteOffset...
  const ciphertext = concatBuffers(cipher.update(dataKey), cipher.final())
  const authTag = cipher.getAuthTag()

  const edk = rawAesEncryptedDataKey(
    keyNamespace,
    keyName,
    iv,
    ciphertext,
    authTag
  )

  return material.addEncryptedDataKey(edk, encryptFlags)