Source Map File Contains 'undefined' when using the node javascript engine

[eli-jordan]

I have been getting started with the play framework, and using this plugin to compile my coffeescript files. I have run into a problem with source maps, where the source mapping file is generated, but it doesnt contain the correct mappings, just 'undefined'. All I did was create a new scala play project using activator, set the node JS engine, and try it out with coffeescript. I have included the config files and the generated output below.

plugins.sbt

resolvers += "Typesafe repository" at "http://repo.typesafe.com/typesafe/releases/"

// The Play plugin
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.3.2")

// web plugins

addSbtPlugin("com.typesafe.sbt" % "sbt-coffeescript" % "1.0.0")

addSbtPlugin("com.typesafe.sbt" % "sbt-less" % "1.0.0")

addSbtPlugin("com.typesafe.sbt" % "sbt-jshint" % "1.0.0")

addSbtPlugin("com.typesafe.sbt" % "sbt-rjs" % "1.0.1")

addSbtPlugin("com.typesafe.sbt" % "sbt-digest" % "1.0.0")

build.sbt

name := """test"""

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayScala)

scalaVersion := "2.11.1"

JsEngineKeys.engineType := JsEngineKeys.EngineType.Node

libraryDependencies ++= Seq(
jdbc,
anorm,
cache,
ws
)

coffeescript file

class Foo
constructor: () -> console.log("Coffee Script File")

test.js: compile js file

(function() {
var Foo;

Foo = (function() {

function Foo() {
  console.log("Coffee Script File");
}

return Foo;

})();

}).call(this);

//# sourceMappingURL=test.js.map

test.js.map: source mapping file

undefined