This if a facade of selectize.js library. All the code is inside facade folder (selectize subproject)
In order to resolve a lib you should add a resolver::
resolvers += sbt.Resolver.bintrayRepo("denigma", "denigma-releases") //add resolver libraryDependencies += "org.scalajs" %%% "selectize-facade" % "0.12.1-0.2.1" //add dependency
You can see an example in preview subproject.
To run preview:
sbt //to opens sbt console re-start //Use this command **instead of** run to run the app Open localhost:5553 to see the result, it should reload whenever any sources are changed