final class StateTransform extends AnyRef

Provides a mechanism for a task to transform the state based on the result of the task. For example:

val foo = AttributeKey[String]("foo")
val setFoo = taskKey[StateTransform]("")
setFoo := {
  state.value.get(foo) match {
    case None => StateTransform(_.put(foo, "foo"))
    case _ => StateTransform(identity)
  }
}
val getFoo = taskKey[Option[String]]
getFoo := state.value.get(foo)

Prior to a call to setFoo, getFoo will return None. After a call to setFoo, getFoo will return Some("foo").

Source
StateTransform.scala
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