Variable retention

retention: () => "timed" | "per-use" | "resident" = retention

Type Declaration

- (): "timed" | "per-use" | "resident"
- Reads the plaintext retention policy, keys.plaintextRetention: resident, timed or per-use. An unrecognised word is timed.
  
  Returns "timed" | "per-use" | "resident"
  the policy