In online doc, I found that I should add
addSbtPlugin(“com.typesafe.sbt” % “sbt-rjs” % “1.0.9”)
to my plugins.sbt file.
But after doing that I get the following error when doing “sbt run”:
sbt.librarymanagement.ResolveException: Error downloading com.typesafe.sbt:sbt-rjs;sbtVersion=1.0;scalaVersion=2.12:1.0.9