Google Cloud Functions with Scala.js

build.sbt

import org.scalajs.core.tools.linker.backend.ModuleKind.CommonJSModule

enablePlugins(ScalaJSPlugin)

name := "My Cloud Function"
scalaVersion := "2.12.6"

scalaJSUseMainModuleInitializer := false
scalaJSModuleKind := CommonJSModule

libraryDependencies += "io.scalajs.npm" %%% "express" % "0.4.2"

CloudFunctions.scala

package de.janhicken.cfwithscala

import scala.scalajs.js.annotation.JSExportTopLevel

object CloudFunctions {
  @JSExportTopLevel("helloWorld")
  val helloWorld: CloudFunction = (request, response) ⇒ {
    response.status(200).send("Hello World!")
  }
}

package.scala

package de.janhicken

import io.scalajs.npm.express.{Request, Response}

import scala.scalajs.js

package object cfwithscala {
   type CloudFunction = js.Function2[Request, Response, Unit]
}

plugins.sbt

addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.23")

run.sh

sbt fastOptJS
ln -s target/scala-2.1?/*-fastopt.js index.js
gcloud beta functions deploy helloWorld --trigger-http