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Scala Development Environment


If you haven't installed Coursier yet, install it first. (Coursier Installation)

Set up

Now, you can use Coursier to set up Scala development environment easily by just running the following command.

cs setup 

The result may look like

Checking if a JVM is installed
Found a JVM installed under /Users/USERNAME/Library/Caches/Coursier/jvm/adopt@1.11.0-11/Contents/Home.

Checking if ~/Library/Application Support/Coursier/bin is in PATH

Checking if the standard Scala applications are installed
Installed ammonite
Found cs
Installed coursier
Installed scala
Installed scalac
Installed scala-cli
Installed sbt
Installed sbtn
Installed scalafmt

Different Java Versions

Would you like to install different Java versions? Check out the Java page.

Install Both Scala 2 and 3

If you want to have Scala 3 as well as Scala 2, you can install both Scala 2 and Scala 3 separately with the explicit scala3 names for the compiler and REPL.

Scala 2


Coursier installs Scala 3 by default, if you want to install Scala 2 (e.g. 2.13.11), run

cs install scalac:2.13.11 scala:2.13.11

It installs both scalac and scala.

Scala 3

Now you can install Scala 3 with the scala3- prefix.


cs install scala3-compiler scala3-repl


cs update scala3-compiler scala3-repl


sbt plugins

Global sbt plugins

You can set global sbt plugins by running the following command. Please choose the ones you want to have.

echo '
addSbtPlugin("io.github.todokr" % "sbt-project-switcher" % "0.1.4")
addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.6.4")
addSbtPlugin("com.github.cb372" % "sbt-explicit-dependencies" % "0.3.1")

addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.0")
addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.11.0")

addSbtPlugin("net.vonbuchholtz" % "sbt-dependency-check" % "5.1.0")

addSbtPlugin("com.github.sbt" % "sbt-license-report" % "1.5.0")

' >> $HOME/.sbt/1.0/plugins/sbt-plugins.sbt



sbt-tpolecat is an SBT plugin for automagically configuring scalac options

Add the following line to project/plugins.sbt.

addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.4.2")


WartRemover is a linting tool that can help you write safe and correct code.

Add the following line to project/plugins.sbt.

addSbtPlugin("org.wartremover" % "sbt-wartremover" % "3.1.3")

In build.sbt,

wartremoverErrors ++= Warts.all

Or more practical settings might be

wartremoverErrors ++= Warts.allBut(Wart.Any, Wart.Nothing, Wart.ImplicitConversion, Wart.ImplicitParameter)

Also add the following setting to exclude the source code generated by build from wart checking.

wartremoverExcluded += sourceManaged.value

Ammonite REPL