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

readOnlyProperty(this, 'keyName', keyName)
    readOnlyProperty(this, 'keyNamespace', keyNamespace)
    readOnlyProperty(this, '_wrapKey', _wrapKey)
    readOnlyProperty(this, '_unwrapKey', _unwrapKey)
  }

  _filter ({ providerId, providerInfo }: EncryptedDataKey) {
    const { keyNamespace, keyName } = this
    return providerId === keyNamespace && providerInfo === keyName
  }

  _onEncrypt = _onEncrypt(randomBytesAsync)
  _onDecrypt = _onDecrypt()
}
immutableClass(RawRsaKeyringNode)

function randomBytesAsync (size: number): Promise {
  return new Promise((resolve, reject) => {
    randomBytes(size, (err: Error|null, buffer: Buffer) => {
      if (err) return reject(err)
      resolve(buffer)
    })
  })
}

export type KmsKeyringNodeInput = Partial>
export type KMSNodeConstructible = KMSConstructible
export type KmsNodeClientSupplier = KmsClientSupplier

export class KmsKeyringNode extends KmsKeyringClass(KeyringNode as KeyRingConstructible) {
  constructor ({
    clientProvider = cacheKmsClients,
    keyIds,
    generatorKeyId,
    grantTokens,
    discovery
  }: KmsKeyringNodeInput = {}) {
    super({ clientProvider, keyIds, generatorKeyId, grantTokens, discovery })
  }
}
immutableClass(KmsKeyringNode)

export { getKmsClient, cacheKmsClients, getClient, limitRegions, excludeRegions, cacheClients, KMS }

readOnlyProperty(this, 'keyName', keyName)
    readOnlyProperty(this, 'keyNamespace', keyNamespace)
    readOnlyProperty(this, '_wrapKey', _wrapKey)
    readOnlyProperty(this, '_unwrapKey', _unwrapKey)
  }

  _filter ({ providerId, providerInfo }: EncryptedDataKey) {
    const { keyNamespace, keyName } = this
    return providerId === keyNamespace && providerInfo.startsWith(keyName)
  }

  _onEncrypt = _onEncrypt(randomBytesAsync)
  _onDecrypt = _onDecrypt()
}
immutableClass(RawAesKeyringNode)

const encryptFlags = KeyringTraceFlag.WRAPPING_KEY_ENCRYPTED_DATA_KEY | KeyringTraceFlag.WRAPPING_KEY_SIGNED_ENC_CTX
const decryptFlags = KeyringTraceFlag.WRAPPING_KEY_DECRYPTED_DATA_KEY | KeyringTraceFlag.WRAPPING_KEY_VERIFIED_ENC_CTX

/**
 * Uses aes-gcm to encrypt the data key and return the passed NodeEncryptionMaterial with
 * an EncryptedDataKey added.
 * @param keyNamespace [String] The keyring namespace (for KeyringTrace)
 * @param keyName [String] The keyring name (for KeyringTrace and to extract the extra info stored in providerInfo)
 * @param material [NodeEncryptionMaterial] The target material to which the EncryptedDataKey will be added
 * @param aad [Buffer] The serialized aad (EncryptionContext)
 * @param wrappingMaterial [NodeRawAesMaterial] The material used to decrypt the EncryptedDataKey
 * @returns [NodeEncryptionMaterial] Mutates and returns the same NodeEncryptionMaterial that was passed but with an EncryptedDataKey added
 */
function aesGcmWrapKey (
  keyNamespace: string,