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

const _unwrapKey = async (material: NodeDecryptionMaterial, edk: EncryptedDataKey) => {
      /* Precondition: Private key must be defined to support decrypt. */
      if (!privateKey) throw new Error('No private key defined in constructor.  Decrypt disabled.')

      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)
    }