Function currentUsage

repos/effect/packages/effect/src/Pool.ts:588–594

(self: Pool<A, E>)

      ),
    (scope, exit) => exit._tag === "Failure" ? Scope.close(scope, exit) : Effect.void
  )

const currentUsage = <A, E>(self: Pool<A, E>) => {
  let count = self.state.waiters
  for (const item of self.state.items) {
    count += item.refCount
  }
  return count
}