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"