在build.sbt中设置sbt对browserify的调用，以便在编译时捆绑依赖项

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

scalaVersion := "2.12.12"

libraryDependencies += "com.typesafe.sbt" % "sbt-web" % "1.4.4"

pipelineStages := Seq(sbtWeb)

JsEngineKeys.parallelism := 1

val browserifyTask = taskKey[Seq[File]]("browserify task")

browserifyTask := {
  val sourceDir = (sourceDirectory in Assets).value / "js"
  val targetDir = (resourceManaged in Assets).value / "public" / "js"
  val outputFile = targetDir / "bundle.js"

  val command = Seq("browserify", sourceDir.toString, "-o", outputFile.toString)
  val exitCode = command.!

  if (exitCode == 0) {
    Seq(outputFile)
  } else {
    throw new RuntimeException("Failed to run browserify")
  }
}

resourceGenerators in Assets += browserifyTask