sbt multi-project Scala with Scalajs and sbt-web-scalajs-bundler plugin example

build.sbt

ThisBuild / organization := "com.org"
ThisBuild / scalaVersion := "2.13.5"
ThisBuild / version      := "0.1.0-SNAPSHOT"

cancelable in Global := true

lazy val root = (project in file("."))
  .aggregate(server, client, sharedJvm, sharedJs)

lazy val server = (project in file("server"))
  .settings(
    scalaJSProjects := Seq(client),
    Assets / pipelineStages  := Seq(scalaJSPipeline),
    pipelineStages := Seq(digest, gzip),
    // triggers scalaJSPipeline when using compile or continuous compilation
    Compile / compile := ((Compile / compile) dependsOn scalaJSPipeline).value,
    libraryDependencies ++= Seq(
      "com.vmunier" %% "scalajs-scripts" % "1.1.4",
      guice,
      specs2 % Test
    )
  )
  .enablePlugins(PlayScala)
  .enablePlugins(WebScalaJSBundlerPlugin)
  .dependsOn(sharedJvm)

lazy val client = (project in file("client"))
  .settings(
    scalaJSUseMainModuleInitializer := true,
    libraryDependencies ++= Seq(
      "org.scala-js" %%% "scalajs-dom" % "1.1.0"
    )
  )
  .enablePlugins(ScalaJSPlugin, ScalaJSBundlerPlugin)
  .dependsOn(sharedJs)

lazy val shared = crossProject(JSPlatform, JVMPlatform)
  .crossType(CrossType.Pure)
  .in(file("shared"))
  .jsConfigure(_.enablePlugins(ScalaJSBundlerPlugin))
  .jsSettings(
    Compile / npmDependencies ++= Seq(
    // "react-router-dom" -> "5.1.2",
    // "@types/react-router-dom" -> "5.1.2"
    )
  )

lazy val sharedJvm = shared.jvm
lazy val sharedJs = shared.js

plugins.sbt

// ..
addSbtPlugin("com.vmunier"               % "sbt-web-scalajs"           % "1.1.0")
addSbtPlugin("org.scala-js"              % "sbt-scalajs"               % "1.5.1")
addSbtPlugin("ch.epfl.scala"             % "sbt-web-scalajs-bundler"   % "0.20.0")
//...