Third-Party Plugins

The Plugins in this section are developed/maintained outside the mill git tree. This list is most likely not complete. If you wrote a Mill plugin or find that one is missing in this list, please open a pull request and add that plugin with a short description (in alphabetical order).

For details about including plugins in your read Using Mill Plugins.

Besides the documentation provided here, we urge you to consult the respective linked plugin documentation pages. The usage examples given here are most probably incomplete and sometimes outdated!

Additional to this list, you can also search the mill-plugin topic on GitHub for more plugins.


This plugin adds an opinionated way of defining aliases to Mill builds. Added aliases are global and applied to the whole build.

import mill._, scalalib._
import $ivy.`com.carlosedp::mill-aliases::0.2.1`
import com.carlosedp.aliases._

object foo extends ScalaModule {

object MyAliases extends Aliases {
  def testall     = alias("__.test")
  def compileall  = alias("__.compile")
  def comptestall = alias("__.compile", "__.test")

To show all the defined aliases:

./mill Alias/list

Run an alias:

./mill Alias/run testall

When run, each aliased task is checked if valid.


ANTLR parser generator support for mill.

import $ivy.`net.mlbox::mill-antlr:0.1.0`
import net.mlbox.millantlr.AntlrModule

object foo extends ScalaModule with AntlrModule {
  override def antlrGrammarSources = T.sources {


AspectJ compiler support for mill.

import mill._
import mill.scalalib._
import mill.define._

// Load the plugin from Maven Central via ivy/coursier
import $ivy.`de.tototec::de.tobiasroeser.mill.aspectj_mill0.9:0.3.1-12-89db01
import de.tobiasroeser.mill.aspectj._

object main extends AspectjModule {

  // Select the AspectJ version
  def aspectjVersion = "1.9.5"

  // Set AspectJ options, e.g. the language level and annotation processor
  // Run `mill main.ajcHelp` to get a list of supported options
  def ajcOptions = Seq("-8", "-proc:none")


For documentation, please refer to the project home page.

Bash Completion

Limited bash completion support.


mill-bundler is comparable to scalajs-bundler for SBT: It manages NPM dependencies for a Scala.js module and bundling it. Currently Webpack and Rollup are implemented but it’s easy to use another one.

CI Release

mill-ci-release is a wrapper around the existing publish functionality of Mill with the aim to making releasing your project in GitHub Actions to Maven easier by automating common setup such as setting up gpg in CI, setting up versioning, and ensuring merges to into your main branch get published as a SNAPSHOT. If you’re coming from sbt, then you’re likely familiar with sbt-ci-release which this plugin imitates.

To get started, you’ll want to use CiReleaseModule as a drop in replacement where you’d normally use the Mill PublishModule and then ensure you implement everything that PublishModule requires.

Secondly, you’ll need to ensure you have a few environment variables correctly set in your GitHub repo. You can see detailed instuctions on which are necessary here.

Then in CI to publish you’ll simply issue a single command:

- run: mill -i

This will automatically grab all the artifacts that you’ve defined to publish in your build and publish them. Your version will automatically be managed by mill-vcs-version and if your version ends in -SNAPSHOT you’re project will be published to Sonatype Snapshots or to the normal releases if it’s a new tag.


Use mill as a launcher for self-building systemd daemons, convenient for handling of code-as-config, or quick editing and rebuilding of code-generating templates.

Place the millw script from in your project directory.

import $ivy.`com.mchange::mill-daemon:0.0.1`
import com.mchange.milldaemon.DaemonModule

object coolproj extends RootModule with DaemonModule {
  override def runDaemonPidFile = Some( os.pwd / "" )

./millw runMainDaemon coolproj.Main "$@"
Description=Cool Project



Symlink /opt/coolproj/coolproj.service from /etc/systemd/system, then systemctl restart coolproj.


Show transitive dependencies of your build in your browser.

import $ivy.`com.github.ajrnz::mill-dgraph:0.2.0`
sh> mill plugin.dgraph.browseDeps(proj)()

Docker Native-Image Packager

This plugin allows building Docker container images with GraalVM Native-Image binaries for cloud-native and fast-startup applications.

Import the plugin, extend your module with DockerNative and configure the parameters for your application using the DockerNativeConfig trait in the dockerNative object.

import mill._, mill.scalalib._, mill.scalalib.scalafmt._
import $ivy.`com.carlosedp::mill-docker-nativeimage::0.6.0`
import com.carlosedp.milldockernative.DockerNative

object hello extends ScalaModule with DockerNative {
  def scalaVersion = "3.3.0"
  object dockerNative extends DockerNativeConfig {
    // Native Image parameters
    def nativeImageName         = "hello"
    def nativeImageGraalVmJvmId = T("graalvm-java17:22.3.2")
    def nativeImageClassPath    = runClasspath()
    def nativeImageMainClass    = "com.domain.Hello.Hello"
    // GraalVM parameters depending on your application needs
    def nativeImageOptions = Seq(
    ) ++ (if (sys.props.get("").contains("Linux")) Seq("--static") else Seq.empty)

    // Generated Docker image parameters
    def baseImage    = "ubuntu:22.04"
    def tags         = List("")
    def exposedPorts = Seq(8080)
# Test run
docker run -it --rm

# Push to a registry
./mill hello.dockerNative.push

For more details and configuration options, please refer to the project readme and also check the provided example code.

Docusaurus 2

Simple Docusaurus runner for Mill

The plugin provides a mill module that allows to build the project web site using Docusaurus 2 as a static content generator.


Create an .ensime file for your build.

import mill._
interp.repositories() =
  interp.repositories() ++ Seq(coursier.MavenRepository(""))


import $ivy.`com.github.yyadavalli::mill-ensime:0.0.2`

You can then run the following to generate the .ensime file

mill fun.valycorp.mill.GenEnsime/ensimeConfig

Optionally, you can specify the ensime server version using the –server flag like

mill fun.valycorp.mill.GenEnsime/ensimeConfig --server "3.0.0-SNAPSHOT"

Explicit Deps

A plugin that checks that ivyDeps and ivyCompileDeps accurately reflect the direct dependencies of your source code.
import $ivy.`io.github.kierendavies::mill-explicit-deps::0.1.0`
import io.github.kierendavies.mill.explicitdeps.ExplicitDepsModule

object foo extends ScalaModule with ExplicitDepsModule {
    // ...
> mill foo.checkExplicitDeps
[37/37] main.checkExplicitDeps
Found undeclared dependencies: (add these to ivyDeps)

Found unimported dependencies: (remove these from ivyDeps)

1 targets failed
main.checkExplicitDeps Found 1 undeclared dependencies, 1 unimported dependencies

Fish Completion

Limited fish completion support.


A plugin to test the generation of your Giter8 template and expected working targets for your template after generation.
import $ivy.`io.chris-kipp::mill-giter8::0.2.0`

import io.kipp.mill.giter8.G8Module

object g8 extends G8Module {
  override def validationTargets =
    Seq("example.compile", "example.fix", "example.reformat")

The most common target you’d then use is mill g8.validate.


A git version plugin for mill.

import $ivy.`com.goyeau::mill-git:<latest version>`
import com.goyeau.mill.git.GitVersionedPublishModule
import mill.scalalib.JavaModule
import mill.scalalib.publish.{Developer, License, PomSettings, VersionControl}

object `jvm-project` extends JavaModule with GitVersionedPublishModule {
  override def pomSettings = PomSettings(
    description = "JVM Project",
    organization = "com.goyeau",
    url = "",
    licenses = Seq(License.MIT),
    versionControl = VersionControl.github("joan38", "mill-git"),
    developers = Seq(Developer("joan38", "Joan Goyeau", ""))
> mill show jvm-project.publishVersion
[1/1] show
[2/2] com.goyeau.mill.git.GitVersionModule.version

GitHub Dependency Graph Submission

A plugin to submit your mill dependency graph to GiHub through their Dependency Submission API.

The easiest way to use this plugin is with the mill-dependency-submission action. You can add it as a workflow:

name: github-dependency-graph

      - main

    runs-on: ubuntu-latest
    - uses: actions/checkout@v3
    - uses: coursier/cache-action@v6
    - uses: actions/setup-java@v3
        distribution: 'temurin'
        java-version: '17'
    - uses: ckipp01/mill-dependency-submission@v1


mill-hepek is a plugin for writing Scala `object`s to files.

It is used as a core for Hepek static site generator: .

Integration Testing Mill Plugins

Integration testing for mill plugins.

We assume, you have a mill plugin named mill-demo

import mill._, mill.scalalib._
object demo extends ScalaModule with PublishModule {
  // ...

Add a new test sub-project, e.g. itest.

import $ivy.`de.tototec::de.tobiasroeser.mill.integrationtest_mill0.9:0.4.0`
import de.tobiasroeser.mill.integrationtest._

object demo extends ScalaModule with PublishModule {
  // ...

object itest extends MillIntegrationTestModule {

  def millTestVersion = "0.9.3"

  def pluginsUnderTest = Seq(demo)


Your project should now look similar to this:

+-- demo/
|   +-- src/
+-- it/
    +-- src/
        +-- 01-first-test/
        |   +--
        |   +-- src/
        +-- 02-second-test/

As the buildfiles in your test cases typically want to access the locally built plugin(s), the plugins publishes all plugins referenced under pluginsUnderTest to a temporary ivy repository, just before the test is executed. The mill version used in the integration test then used that temporary ivy repository.

Instead of referring to your plugin with import $ivy.'your::plugin:version', you can use the following line instead, which ensures you will use the correct locally build plugins.

import $exec.plugins

Effectively, at execution time, this line gets replaced by the content of, a file which was generated just before the test started to execute.

Please always refer to the official plugin documentation site for complete and up-to-date information.

JaCoCo - Code Coverage

Mill plugin to collect test coverage data with JaCoCo and generate reports.


Create static sites/blogs with JBake.

JBake home:

import mill._
import $ivy.`de.tototec::de.tobiasroeser.mill.jbake:0.1.0`
import de.tobiasroeser.mill.jbake._

object site extends JBakeModule {

  def jbakeVersion = "2.6.4"


Generate the site:

bash> mill site.jbake

Start a local Web-Server on Port 8820 with the generated site:

bash> mill site.jbakeServe


This is a mill module similar to BuildInfo but for Java. It will generate a Java class containing information from your build.

To declare a module that uses this plugin, extend the com.github.carueda.mill.JBuildInfo trait and provide the desired information via the buildInfoMembers method:

import $ivy.`com.github.carueda::jbuildinfo:0.1.2`
import com.github.carueda.mill.JBuildInfo
import mill.T

object project extends JBuildInfo {
  def buildInfoMembers: T[Map[String, String]] = T {
      "name" -> "some name",
      "version" -> "x.y.z"

This will generate:

public class BuildInfo {
  public static final String getName() { return "some name"; }
  public static final String getVersion() { return "x.y.z"; }
  • def buildInfoMembers: T[Map[String, String]]

The map containing all member names and values for the generated class.

  • def buildInfoClassName: String, default: BuildInfo

The name of the class that will contain all the members from buildInfoMembers.

  • def buildInfoPackageName: Option[String], default: None

The package name for the generated class.


Kotlin compiler support for mill.

// Load the plugin from Maven Central via ivy/coursier
import $ivy.`de.tototec::de.tobiasroeser.mill.kotlin_mill0.9:0.2.0`

import mill._
import mill.scalalib._
import mill.define._

import de.tobiasroeser.mill.kotlin._

object main extends KotlinModule {

  // Select the Kotlin version
  def kotlinVersion = "1.4.21"

  // Set additional Kotlin compiler options, e.g. the language level and annotation processor
  // Run `mill main.kotlincHelp` to get a list of supported options
  def kotlincOptions = super.kotlincOptions() ++ Seq("-verbose")


For documentation please visit the mill-kotlin project page.

You will find there also a version compatibility matrix.


Simple MDoc runner for Mill

This plugin provides a mill module that allows to execute Scala MDoc from within a mill build. Scala MDoc simply compiles properly marked Scala snippets in plain md files and optionally runs them through an interpreter, augmenting the code with the interpreter output.

millw / millw.bat - Mill Wrapper Scripts

Small script to automatically fetch and execute mill build tool.

millw is a small wrapper script around mill and works almost identical to mill, but with additional features and compatibility with Windows. It automatically downloads a mill release into $HOME/.mill/download.


Check binary compatibility with mill.

Just mix-in the Mima trait into your ScalaModule. And set the previous artifacts you want to check binary compatibility.

import mill._, scalalib._

import $ivy.`com.github.lolgab::mill-mima_mill0.9:0.0.2`
import com.github.lolgab.mill.mima._

object main extends ScalaModule with Mima {

  def mimaPreviousArtifacts = Agg(

  // other settings ...


You can then check the binary compatibility of the module with:

> mill main.mimaReportBinaryIssues
Binary compatibility check passed.

missinglink check for Mill, ported from sbt-missinglink.

import $ivy.`io.github.hoangmaihuy::mill-missinglink::<latest-version>`
import io.github.hoangmaihuy.missinglink._

object example extends MissinglinkCheckModule

Runtime missinglink check command

> mill example.missinglinkCheck


Build GraalVM Native-Image binaries with mill.

Import the plugin and add the NativeImage trait to your module and set some configuration options:

import $ivy.`io.github.alexarchambault.mill::mill-native-image::0.1.25`
import io.github.alexarchambault.millnativeimage.NativeImage

object hello extends ScalaModule with NativeImage {
  def scalaVersion = "3.3.0"
  def ivyDeps = ... // Your deps here

  def nativeImageName         = "hello"
  def nativeImageMainClass    = "Main"
  def nativeImageGraalVmJvmId = "graalvm-java17:22.3.2"
  def nativeImageClassPath    = runClasspath()
  def nativeImageOptions = Seq(
  ) ++ (if (sys.props.get("").contains("Linux")) Seq("--static") else Seq.empty)

Then run the nativeImage task to build the native-image binary.

> ./mill hello.nativeImage
                        5.9s (4.9% of total time) in 32 GCs | Peak RSS: 5.71GB | CPU load: 5.84
Produced artifacts:
 /Users/myuser/repos/scala/mill-native-image/example/out/hello/nativeImage.dest/hello (executable
 /Users/myuser/repos/scala/mill-native-image/example/out/hello/nativeImage.dest/hello.build_artifacts.txt (txt)
Finished generating 'hello' in 2m 0s.

For more configuration options, building binaries inside Docker, a sample project and more, check the project readme.


Produce OSGi Bundles with mill.

import mill._, mill.scalalib._
import $ivy.`de.tototec::de.tobiasroeser.mill.osgi:0.0.5`
import de.tobiasroeser.mill.osgi._

object project extends ScalaModule with OsgiBundleModule {

  def bundleSymbolicName = "com.example.project"

  def osgiHeaders = T{ super.osgiHeaders().copy(
    `Export-Package`   = Seq("com.example.api"),
    `Bundle-Activator` = Some("com.example.internal.Activator")

  // other settings ...


PowerShell Completion

Basic PowerShell completion support.


Since Mill 0.6.1-27-f265a4 there is a built-in publishM2Local target in PublishModule.

Mill plugin to publish artifacts into a local Maven repository.

Just mix-in the PublishM2Module into your project. PublishM2Module already extends mill’s built-in PublishModule.


import mill._, scalalib._, publish._

import $ivy.`de.tototec::de.tobiasroeser.mill.publishM2:0.0.1`
import de.tobiasroeser.mill.publishM2._

object project extends PublishModule with PublishM2Module {
  // ...

Publishing to default local Maven repository

> mill project.publishM2Local
[40/40] project.publishM2Local
Publishing to /home/user/.m2/repository

Publishing to custom local Maven repository

> mill project.publishM2Local /tmp/m2repo
[40/40] project.publishM2Local
Publishing to /tmp/m2repo

Rust JNI

A plugin for build Rust JNI code!

For documentation please visit the mill-rust-jni project page.


Scalablytyped support for mill.

Mix-in the ScalablyTyped trait into your ScalaJSModule and set-up a package.json file with your TypeScript dependencies.

import mill._, scalalib._

import $ivy.`com.github.lolgab::mill-scalablytyped::0.0.2`
import com.github.lolgab.mill.scalablytyped._

object main extends ScalaJSModule with ScalablyTyped {

  // other settings ...


It will run ScalablyTyped and add the converted dependencies to the module’s ivyDeps.

Scala TSI

scala-tsi support for Mill

import $ivy.`io.github.hoangmaihuy::mill-scala-tsi::<latest-version>`

import io.github.hoangmaihuy.scalatsi._

object example extends ScalaModule with ScalaTsiModule {
// The classes that you want to generate typescript interfaces for
override def typescriptExports = Seq("MyClass")
// The output file which will contain the typescript interfaces
override def typescriptOutputFile = millSourcePath / "model.ts"
// Include the package(s) of the classes here
// Optionally import your own TSType implicits to override default default generated
override def typescriptGenerationImports = Seq("mymodel._", "MyTypescript._")


case class MyClass(foo: String, bar: Int)

Generate Typescript command:

> mill example.generateTypescript


export interface IMyClass {
  foo: string
  bar: number


Scalafix support for mill.

import $ivy.`com.goyeau::mill-scalafix:<latest version>`
import com.goyeau.mill.scalafix.ScalafixModule
import mill.scalalib._

object project extends ScalaModule with ScalafixModule {
  def scalaVersion = "2.12.11"
> mill project.fix
[29/29] project.fix
/project/project/src/MyClass.scala:12:11: error: [DisableSyntax.var] mutable state should be avoided
  private var hashLength = 7
1 targets failed
project.fix A Scalafix linter error was reported

SCIP (SCIP Code Intelligence Protocol)

Support for generating SCIP indexes from your Mill build. This is most commonly used to power intelligent code navigation on Sourcegraph.

The recommended way to use mill-scip is via the scip-java cli tool that can be installed via Coursier.

cs install scip-java

Once you have scip-java installed the following command and the root of your Mill build will generate an index and place it at the root of your project.

scip-java index

You can also manually trigger this with Mill by doing the following:

mill --import ivy:io.chris-kipp::mill-scip::0.3.7 io.kipp.mill.scip.Scip/generate

This will then generate your index.scip inside of out/io/kipp/mill/scip/Scip/generate.dest/.

Shell Completions

As Mill is a tool often used from the CLI (Command line interface), you may be also interested in installing some completion support for your preferred shell:

Spring Boot

Support packaging Spring Boot Applications with Mill.

import mill._
import mill.scalalib._
import de.tobiasroeser.mill.spring.boot.SpringBootModule

object app extends MavenModule with SpringBootModule {
  override def springBootToolsVersion = "2.7.13"
# Package as executable Spring-Boot Application
$ mill app.springBootAssembly

Universal Packager

Support universal archive packaging for Java application with Mill, ported from sbt-native-packager.

import $ivy.`io.github.hoangmaihuy::mill-universal-packager::<latest-version>`

import io.github.hoangmaihuy.mill.packager.archetypes.JavaAppPackagingModule

object example extends JavaAppPackagingModule {
  override def packageVersion = "0.1.0"
# Package as zip archive with Bash start script
$ mill example.universalPackage

VCS Version

Mill plugin to derive a version from (last) git tag and edit state. It may support other VCS as well.

Lots of formatting options are provided. When used with its defaults, the outcome is identical to the version scheme that Mill itself uses.

import mill._
import mill.scalalib._

// Load the plugin from Maven Central via ivy/coursier
import $ivy.`de.tototec::de.tobiasroeser.mill.vcs.version::0.1.2`
import de.tobiasroeser.mill.vcs.version.VcsVersion

object main extends JavaModule with PublishModule {
  override def publishVersion: T[String] = VcsVersion.vcsState().format()

Zsh Completion

Limited zsh completion support.

This plugin adds ZSH shell completions to Mill.