vault 
Vault is a tiny library that provides a single data structure called vault.
Inspiration was drawn from HeinrichApfelmus/vault and the original blog post
A vault is a type-safe, persistent storage for values of arbitrary types. Like Ref, it should be capable of storing values of any type in it, but unlike Ref, behave like a persistent, first-class data structure.
It is analogous to a bank vault, where you can access different bank boxes with different keys; hence the name.
Microsite
Head on over to the microsite
Quick Start
To use vault in an existing SBT project with Scala 2.12 or a later version, add the following dependencies to your
build.sbt depending on your needs:
libraryDependencies ++= Seq(
"org.typelevel" %% "vault" % "<version>"
)