Nel

Single class library with non empty list inside

  import com.evolutiongaming.nel.Nel
  
  scala> Nel(1, 2)
  res0: com.evolutiongaming.nel.Nel[Int] = Nel(1, 2)

Setup

resolvers += Resolver.bintrayRepo("evolutiongaming", "maven")

libraryDependencies += "com.evolutiongaming" %% "nel" % "1.3.4"