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

const _unwrapKey = async (material: NodeDecryptionMaterial, edk: EncryptedDataKey) => {
      const { keyNamespace, keyName } = this
      /* The AAD section is uInt16BE(length) + AAD
       * see: https://docs.aws.amazon.com/encryption-sdk/latest/developer-guide/message-format.html#header-aad
       * However, the RAW Keyring wants _only_ the ADD.
       * So, I just slice off the length.
       */
      const { buffer, byteOffset, byteLength } = serializeEncryptionContext(material.encryptionContext).slice(2)
      const aad = Buffer.from(buffer, byteOffset, byteLength)
      // const aad = Buffer.concat(encodeEncryptionContext(context || {}))

      return aesGcmUnwrapKey(keyNamespace, keyName, material, wrappingMaterial, edk, aad)
    }

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

/* The AAD section is uInt16BE(length) + AAD
       * see: https://docs.aws.amazon.com/encryption-sdk/latest/developer-guide/message-format.html#header-aad
       * However, the RAW Keyring wants _only_ the ADD.
       * So, I just slice off the length.
       */
      const { buffer, byteOffset, byteLength } = serializeEncryptionContext(material.encryptionContext).slice(2)
      const aad = Buffer.from(buffer, byteOffset, byteLength)
      // const aad = Buffer.concat(encodeEncryptionContext(context || {}))

      return aesGcmUnwrapKey(keyNamespace, keyName, material, wrappingMaterial, edk, aad)
    }

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

const { keyNamespace, keyName } = this
      /* The AAD section is uInt16BE(length) + AAD
       * see: https://docs.aws.amazon.com/encryption-sdk/latest/developer-guide/message-format.html#header-aad
       * However, the RAW Keyring wants _only_ the ADD.
       * So, I just slice off the length.
       */
      const { buffer, byteOffset, byteLength } = serializeEncryptionContext(material.encryptionContext).slice(2)
      const aad = Buffer.from(buffer, byteOffset, byteLength)
      // const aad = Buffer.concat(encodeEncryptionContext(context || {}))

      return aesGcmUnwrapKey(keyNamespace, keyName, material, wrappingMaterial, edk, aad)
    }

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

const _unwrapKey = async (material: NodeDecryptionMaterial, edk: EncryptedDataKey) => {
      const { keyNamespace, keyName } = this
      /* The AAD section is uInt16BE(length) + AAD
       * see: https://docs.aws.amazon.com/encryption-sdk/latest/developer-guide/message-format.html#header-aad
       * However, the RAW Keyring wants _only_ the ADD.
       * So, I just slice off the length.
       */
      const { buffer, byteOffset, byteLength } = serializeEncryptionContext(material.encryptionContext).slice(2)
      const aad = Buffer.from(buffer, byteOffset, byteLength)
      // const aad = Buffer.concat(encodeEncryptionContext(context || {}))

      return aesGcmUnwrapKey(keyNamespace, keyName, material, wrappingMaterial, edk, aad)
    }

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

const trace: KeyringTrace = {
        keyName: this.keyName,
        keyNamespace: this.keyNamespace,
        flags: KeyringTraceFlag.WRAPPING_KEY_DECRYPTED_DATA_KEY
      }

      const { buffer, byteOffset, byteLength } = edk.encryptedDataKey
      const encryptedDataKey = Buffer.from(buffer, byteOffset, byteLength)
      const unencryptedDataKey = privateDecrypt(
        { key: privateKey, padding },
        encryptedDataKey)
      return material.setUnencryptedDataKey(unencryptedDataKey, trace)
    }

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

keyNamespace: this.keyNamespace,
        flags: KeyringTraceFlag.WRAPPING_KEY_DECRYPTED_DATA_KEY
      }

      const { buffer, byteOffset, byteLength } = edk.encryptedDataKey
      const encryptedDataKey = Buffer.from(buffer, byteOffset, byteLength)
      const unencryptedDataKey = privateDecrypt(
        { key: privateKey, padding },
        encryptedDataKey)
      return material.setUnencryptedDataKey(unencryptedDataKey, trace)
    }

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

const trace: KeyringTrace = {
        keyName: this.keyName,
        keyNamespace: this.keyNamespace,
        flags: KeyringTraceFlag.WRAPPING_KEY_DECRYPTED_DATA_KEY
      }

      const { buffer, byteOffset, byteLength } = edk.encryptedDataKey
      const encryptedDataKey = Buffer.from(buffer, byteOffset, byteLength)
      const unencryptedDataKey = privateDecrypt(
        { key: privateKey, padding },
        encryptedDataKey)
      return material.setUnencryptedDataKey(unencryptedDataKey, trace)
    }

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

keyName: this.keyName,
        keyNamespace: this.keyNamespace,
        flags: KeyringTraceFlag.WRAPPING_KEY_DECRYPTED_DATA_KEY
      }

      const { buffer, byteOffset, byteLength } = edk.encryptedDataKey
      const encryptedDataKey = Buffer.from(buffer, byteOffset, byteLength)
      const unencryptedDataKey = privateDecrypt(
        { key: privateKey, padding },
        encryptedDataKey)
      return material.setUnencryptedDataKey(unencryptedDataKey, trace)
    }

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