Changelog

Security Fix: Update protobuf-java to 3.25.5 #3639

Backport: Fixed property handling when using --define/-D from the Mill CLI. #3795

Backport: GenIdea: Handle failure when evaluating module sources/resources #3755

Update asm from 9.7 to 9.7.1 for Java 24 support #3745

Bump uTest to 0.8.4 #3340

Manage TestModule dependencies via build.sc #3320

Fix the warning not being printed when -i/--interactive/--no-server/--bsp are not the first argument #3346

GenIdea: Make Scala SDK specific for JS / Native #3348

CI: Adapt CI for 0.11.x branch #3350

GenIdea: unroll module dependencies #3358

Print pretty error message when Result.Failure is thrown #3393

Avoid spurious deprecation warnings in generated code #3400

Workaround issue in Sonatype which started failing on double slashes in URLs (even though they previously worked) Link

Overhaul of the documentation site at https://mill-build.org

New Java- and Scala-specific sections on the documentation, with more detailed comparisons to existing build tools

Added graphviz diagrams throughout to help the user in visualizing the concepts involved

Update versions of JUnit sbt-test-interface libraries that Mill uses #3296

Make it simpler to resolve dependencies in custom tasks via defaultResolver().resolveDeps #3330

Improvements in Java docs and user experience #3278

Automatically pump os.proc streams when SystemStreams are redirected #3275

Fix resolution of children of override lazy val modules #3270

First class support for Java projects #3261

Add coarse grained lock around BSP request to avoid deadlocks #3243

Support Scala Native 0.5.0 #3054 #3107 #3120

Add jvmOptions to docker contrib configuration #3079

Pass auxiliary class files to zinc, so they are deleted together #3072

BSP: Handle new JvmCompileClasspath request #3086

Add support for Cobertura XML report task to help integration #3093

Support Scala.js minify via scalaJSMinify: Target[String] #3094

Restructure TestModule, add RunModule #3064

Move run-targets into RunModule #3090

TestModule: Support generation of JUnit-compatible xml report #3099 #3172 #3135 #3184

Use docker image hash to determine if build should rerun #3124

Add multi platform support to contrib.docker through docker buildx #3143

Add ability to re-write ESModule imports at link time #3109

Adding sonatype central support #3130 #3187

Add TestModule.discoveredTestClasses target to ease test inspection #3191

Support "pom" packaging type in PublishModule #3222

Restructure VersionFinder, increase speed, added ticker messages #3014

Fix bsp compile classpath inconsistencies #3017

Bring more bsp-specific targets in line with their non-bsp versions #3018

Make BSP task processing more resilient #3022

Update example build.sc with current library versions #3055

Scoverage: Do not include the scalac plugin in the reporting classpath #3060

Add Scala 2.13.13 and 2.12.19 to supported bridges list #3066

Fix BuildInfo static Java file generator #3074

Scoverage inner module defaults to skipIdea = outer.skipIdea #3098

Deduplicate input tasks in inspect command #3102

CI: add scalafix-check to precondition to publish #3095

Docs for Continuous cache invalidation #3096

Isolate scoverage modules from their parent modules #3118

Scoverage improve classpath override to the minimal #3122

Improve internal BSP API and docs, fix a match error condition #3111

Retry example integration tests that didn’t finish after 5 minutes #3125

Fix mill script for parameter starting with -i #3127

Fixed semanticdb file copying issue, added more tests #3080

Detect assemblies with too many entries to fail shell script prepending #3140

Exclude mill provided dependencies in meta builds #3189 #3221

Fix Scala.js toolchain logs in server-client mode #3196

Fix compiler bridge build setup and build essential versions in CI #3179

Add Scala 2.13.14 to bridgeScalaVersions #3166

GenIdea improvements #3153

GenIdea: Use synthetic scala-SDK entry for compiler setup #3154

Fix classpath regression in Bloop export #1918 #3211

Support build.sc in Bloop #3208

Fail if testOnly does not match any test case #3224

Code cleanups

Documentation updates and fixes

Test and CI improvements

Updates: acyclic 0.3.12, Ammonite 3.0.0-M2-11-713b6963, asm 9.7, commons-compress 1.26.2, commons-io 2.16.1, coursier 2.1.10, fastparse 3.1.0, fansi 0.5.0, guava 33.2.1, jarjar-abrams-core 1.14.0, jline 3.26.2, junixsocket 2.9.1, log4j-core 2.23.1, mainargs 0.7.0 mill-mima 0.1.1, mill-scalafix 0.4.0, os-lib 0.10.2, Play 2.8.22 / 2.9.4 / 3.0.4, pprint 0.9.0, protobuf-java 3.25.3, Scala 2.12.19 / 2.13.14, Scala Native 0.4.17 / 0.5.3, scala-xml 2.3.0, scalacheck 1.18.0, scalatest 3.2.18, scoverage 2.1.1, semanticdb-java 0.9.10, semanticdb-scalac 4.9.7 requests 0.8.3, upickle 3.3.1, utest 0.8.3, zinc 1.10.0

Support type selectors as path selection syntax in resolve #2997, #2998

Read coursier default config files to set up repositories and support mirror configuration #2886, #2917

Added support for type attribute when parsing dependencies #2994

Add new ScalaModule.scalacHelp command #2921

Add a ScalaModule.consoleScalacOptions target #2948

Enable colored output for Scala 2 compiler output #2950

Add publishLocalCached and publishM2LocalCached targets to PublishModule #2976

Support Scala Native build target. This allows to build static and dynamic libraries other than binaries #2898

Prepare the Scala.js integration for SIP-51 #2988

Better detect Windows Subsystem for Linux environments #2901

Avoid evaluating `T.input`s twice #2952

Deduplicate (anonymous) tasks in results #2959

Synchronize evaluateGroupCached to avoid concurrent access to cache #2980

Properly sanitize Windows reserved names and symbols in evaluator paths #2964, #2965

Detect colliding cross module values #2984

Mask forward slashes in cross values to fix their cache locations #2986

Re-enable test result summary (print done message from test framework to stdout) #2993

Fix overeager caching of cliImports value in generatedScriptSources #2977

Allow resolving moduleDeps with older Scala 3 versions #2877

GenIdea: Put module dependencies after library dependencies #2925

BSP: do not filter clean-requests for meta-builds #2931

BSP: Add JavaModule.bspBuildTargetData to make JavaModule reports workable BuildTarget #2930

BSP: Send logMessage instead of diagnostics when textDocument is unknown #2979

Scoverage inner module defaults new to skipIdea = true #2989

Dependency updates: asm-tree 9.6, bsp4j 2.2.0-M1, coursier 2.1.8, jline 3.25.0, jna 5.14.0, junixsocket-core 2.8.3, log4j-core 2.22.1, mainargs 0.6.1, os-lib 0.9.3, scalafmt 3.7.15, Scala.js 1.15.0, scala-native 8.4.16, semanticdb-java 0.9.8, semanticdb-scala 4.8.15, upickle 3.1.4, zinc 1.9.6

Contrib dependency updates: Play 2.8.21, Play 2.9.1, Play 3.0.1

Documentation updates and new sections

More code cleanups, explicit result types and enforcement of some code quality metrics via mill-scalafix

Make PathRef robust against concurrent filesyste modifications #2832

Use logger error stream for informational messages #2839

Harden assembly logic against Zip-Slip vulnerabilities #2847

Add an option to disable incremental compilation with zinc #2851

Add check for right Tests traits in ScalaJS and Native #2874

Attempt to recover from client/server connection errors to #2879

Fix discovery of targets whose names get mangled #2883

Make mill show skip -j prefixes to ensure machine readability #2884

Support for Java 21 #2768

Various BSP improvements #2814, #2813, #2810, #2771

The T.workspace context path now always points to the top-level project directory, also for meta builds #2809

Mill now better detects and reports logical cycles in inter-module dependencies #2790

Fixed semanticDB data generation for meta builds #2809

The prepareOffline command also fetches relevant compiler-bridges for Scala modules #2791

Improved ScalaJSModule and added support for IRFileCache #2783

The JavaModule.zincReportCachedProblems configuration can now also customized via a Java system property #2775

Fixed a file truncation issue in protobuf module and print a warning when proto file get overwritten #2800

Documentation improvements

Dependency updates: bsp4j 2.1.0-M7, castor 0.3.0, coursier-interface 1.0.19, jarjarabrams 1.9.0, jline 3.23.0, junitsocket 2.8.1, mainargs 0.5.4, scalafmt 3.7.14, Scala.js 1.14.0, semanticdb-java 0.9.6, semanticdb-scala 4.8.10

Various other improvements and cleanups

Fix binary incompatibility issue with Discover macro’s generated generic code #2749

Support the release-size mode in ScalaNativeModule #2754

Allow Mill CLI to select the meta-build frame it operates on via --meta-level <n> #2719

Improve the mill resolve suggestion when a user specifies a target in the wrong module #2731

Fix conflicting dependencies between upstream JavaModules #2735

Fix the scala-library dependency for (generic) platform modules #2739

Fix terminal forwarding in .console and .repl commands #2743

Target invalidation after making changes to build.sc is now done at a fine-grained method-level granularity, using callgraph reachability analysis to see which targets depend on the code that was changed. See #2417 for more details

Fix redirection of stdout stream to stderr when using show #2689

Fix line numbers in errors for scripts starting with leading comments or whitespace #2686

Fix init command and support runnig Mill without existing build.sc file #2662

Fixes for BSP editor integration sometimes using the wrong output folder for meta-build metadata, causing subsequent builds from the command line to fail #2692

Added a new mill.idea.GenIdea/idea command to generate IntelliJ IDE metadata, improving-upon and replacing the older mill.scalalib.GenIdea/idea command which is now deprecated #2638

Update Coursier to 2.1.6 to mitigate CVE CVE-2022-46751 #2705

mill.define.Cross: Introduced default cross segments and some CLI convenience

mill.testrunner: Fixed exception when running ScalaTest or ZIOTest frameworks

mill.runner: Removed some obsolete / defunct cli options

mill.runner: Properly distinct-ify commands when resolving wide matching target patterns

mill.scalajslib: Restored correct defaults for esFeature

mill.bsp: Fixed a MatchError in the buildtarget/scalaTestClasses request

mill.contrib.bloop: Corrected accidentally changed package name resulting in non-functional plugin

mill.contrib.scoverage: Fixed defunct plugin due to a missing type annotation

Various internal improvements

Dependency updates: Ammonite 3.3.0-M0-32-96e851cb, bsp4j 2.1.0-M5, zinc 1.9.1

Mill is now build with Mill 0.11

0.11.0 is the next breaking version after the 0.10.x series, with a large number of improvements. See the changelog below for 0.11.0-M1 to 0.11.0-M11 for a full list of user-facing changes.

Make foo.test command run tests with user code in the boot classloader, rather than in a sub-classloader #2561

Mill backend server timeout is now configurable #2550

Mill assembly is now distributed via Maven Central, rather than Github release assets, to remove an unnecessary single point of failure #2560

Tests inner trait was removed, to avoid trait shadowing which will be removed in Scala 3. Please use ScalaTests, ScalaJSTests, or ScalaNativeTests instead #2558

Make mill.define.Module a trait to allow abstract/virtual modules to be traits rather than classes #2536

Move mill.BuildInfo to mill.main.BuildInfo to avoid name conflicts with mill.contrib.buildinfo.BuildInfo #2537

PlatformScalaModule now exposes platformScalaSuffix for user code to use #2534

Add Agg.when operator to simplify common workflow of adding optional flags or command line parameters #2353

Generalize handling of test module source folder layout, such that they always match the folder layout of the enclosing module #2531

Overhauled target resolution logic. It is now significantly lazier, resulting in less of the module tree being un-necessarily instantiated, and also more precise and predictable #2453 #2511

Allow tasks to be passed as the CLI parameters of the run command, allowing run to be easily used in the implementation of other tasks #2452

T.inputs are now watched properly with --watch, and trigger re-evaluations when the watched value changes #2489

Support for Java 20 #2501

Broke up mill.modules package #2513, with functionality re-distributed to mill.util and mill.scalalib

Overhaul BSP-related code, for improved fidelity and correctness #2415 #2414 #2518 #2521

Enabled compilation warnings in build.sc #2519

Print out the CLI flags when inspecting T.commands #2522

Added an example/ folder in the Mill repo, containing common build setups demonstrating Mill features with explanations of how each feature works

Pre-compiled Scala incremental compiler interface #2424, to speed up clean builds

Add some helpers to simplify cross-version/cross-platform modules {#2406}[https://github.com/com-lihaoyi/mill/pull/2406]

You can now override T{…​} Targets with T.source or T.sources, and vice versa #2402

Removed the Ammonite script runner dependency used to evaluate build.sc files and instead compile them using Mill #2377

Add TestModule.ZioTest #2432

Caching fixes for external modules #2419

Overhaul of the Mill BuildInfo plugin, moving the key-value into resources to avoid needing to re-compile your module when the values change, adding JavaModule support, and allowing Javadoc/Scaladoc comments to be associated with the generated BuildInfo constants #2425

Global Configuration via ~/.mill/ammonite/predefScript.sc is no longer supported in this version. If that breaks your workflow, please report and tell us your use case so we can provide sufficient replacement or support for your use case before Mill 0.11.

Overhaul of the documentation. Created many executable example projects which are included in the documentation and run/tested on CI

Change cross module definitions to be traits instead of classes, for greater regularity and less builerplate at call sites. This change requires slight modification to existing build scripts that define cross modules.

Introduced automatic PathRef validation for cached targets; default-enabled it for CoursierModule.resolveDeps and various resolvedIvyDeps targets

bsp: Update Protocol version to 2.1.0-M4

bsp: Support new mainClasses field in run and test environments

bsp: Fixed handling of Mill plugins and other improvements

scalanativelib: new nativeDump setting in ScalaNativeModule

contrib.twirllib: Use newer scala-parser-combinators version when used with Scala 3

contrib.scalapblib: Added new flag to search for proto files in dependencies

Various refactorings to improve binary compatibility

Updated dependencies: Ammonite 3.0.0-M0-5 coursier 2.1.0, scala native tools 0.4.12, semanticdb 4.7.6, trees 4.7.6, upickle 3.0.0

DX improvements

main: Re-added missing --color and predef cli arguments.

Cross is no longer adding the cross parameters to the millSourcePath.

API refactorings: PathRef, moved JarManifest to mill.main

No longer inherit the Ammonite CLI config

scalalib: Fixed loosing customized mapDependencies when ScalaModule get mixed in after

scalalib: New TestModule.Weaver

scalajslib: New JsEnvConfig.Selenium

testrunner: Fixed concurrency issue with test event reporting

Updated dependencies: ammonite 3.0.0-M0-3, coursier 2.1.0-RC6, jarajar-abrams-core 1.8.2, lambdatest 0.8.0, log4j-core 2.20.0, os-lib 0.9.1, scoverage 2.0.8, semanticdb-scalac 4.7.5, trees 4.7.5

Documentation updates

scalalib: New configuration target zincReportCachedProblems which, when true, enables reporting of all found problems, even for files which were not re-compiled

scalalib: Improved SemanticDB support for Java and Scala

scalalib: Mitigate another coursier download issue

scalajslib: Fetch more tooling dependencies in prepareOffline

scalanativelib: Fetch more tooling dependencies in prepareOffline

scalanativelib: Updated tools to version 0.4.10

bsp: Improved support for the mill-build module which should improve the editing experience for build.sc and other build files

Cleanups and internal improvements

Updated dependencies: Ammonite 3.0.0-M0-1, junixsocket 2.6.2, semanticdb-java 0.8.13, upickle 3.0.0-M2

Slightly changed the out/ folder layout for overridden and private tasks. Instead of foo.overridden we now use a foo.super path to hold the metadata and scratch files.

Fixed the caching for private targets with same name but defined in different super traits.

Fixed non-functional clean command when used with arguments denoting modules.

scalalib: Fixed GenIdea issues on Windows, when the build uses plugins or additional libraries.

scalajslib: ScalaJSModule.ScalaJSTests now extends ScalaModule.ScalaTests which improves consistency, better default values and compatibility with other modules like ScoverageModule.

scalanativelib: ScalaNativeModule.ScalaNativeTests now extends ScalaModule.ScalaTests which improves consistency, better default values and compatibility with other modules.

contrib.gitlab: Improved error handling for token lookup and documentation.

Updated dependencies: coursier 2.1.0-RC5, jna 5.13.0, semanticdb-scala 4.7.3, trees 4.7.3

Documentation improvements

Splitted BSP module into mill.bsp and mill.bsp.worker and removed various dependencies (guava, bsp4j, xtends, lsp4j, …​) from Mill API

scalalib: Added support to generate semanticdb data for Java source files

scalajslib: Added support for scalaJSOutputPattern

scalajslib: Added suport for scalaJSSourceMap

scalajslib: Dropped support for Scala.js 0.6

Updated dependencies: ammonite 2.5.6, coursier 2.1.0-RC4, semanticdb 4.7.1, requests 0.8.0, scalafmt 3.6.1, trees 4.7.1, upickle 3.0.0-M1, utest 0.8.1

Various internal cleanups and improvements

Documentation improvements

Greatly improved dependency resolution between modules, making it possible to mix Java and Scala modules

main: Restrict Cross parameter to be of type Module

scalalib: Performance improvements in Zinc worker module

scalalib: Resources are no longer added to compileClasspath.

scalalib: Added new compileResources which will end up in compileClasspath

scalalib: Consolidated artifact and platform suffix handling

scalajslib : Performance improvements in worker module

scalanativelib : Performance improvements in worker module

Updated dependencies: coursier 2.1.0-RC3, os-lib 0.9, scala 2.12.17, trees 4.7.0

Removed lots of deprecated API

Various internal cleanups and improvements

Make semanticDbEnablePluginScalacOptions protected and thus accessible for downstream use and customization

Backport of Java 20 compatibility

Deprecated mill.define.SelectMode.Single

Backport of mill.eval.Evaluator.evalOrThrow

Deprecated all inner Tests traits of modules derived from JavaModule and provide type aliases to use their successors

Dependency updates: Ammonite 2.5.11, Coursier 2.1.7, jarjar-abrams 1.9.0, Junixxocket 2.8.2, Play 2.8.21, Scalameta Trees 4.8.12, Scala Native 0.4.16, Scoverage 2.0.11, Zinc 1.9.5

scalalib: Mitigate another coursier download issue (backported from 0.11.0-M4)

testrunner: Fixed a concurrency issue with test event reporting (backported from 0.11.0-M5)

scalajslib: Deprecated fastOpt and fullOpt

Updated dependencies: coursier 2.1.0, jarjar-abrams 1.8.2, jna 5.13.0, junixsocket 2.6.2, log4j-core 2.20.0, scalafmt-dynamic 3.6.1, trees 4.7.6

Fixed non-functional clean command when used with arguments denoting modules.

scalalib: Fixed GenIdea issues on Windows, when the build uses plugins or additional libraries.

scalajslib: Performance improvements in worker module

scalajslib: Pass more settings from ScalaJSModule to its Tests

Some internal improvements backported from 0.11.0-M3

Lots of documentation improvements, additions and restructurings

core: Fixed some rare issues with reading the .mill-jvm-opts file

core: We made slight adaptions to the T.dest location of target defined in included files, to fix potential colliding cache locations

scalalib: JAR archives created by Mill now by default contain directory entries

scalalib: Updated zinc to 1.8.0

scalajslib: Added support for more JsEnv providers

scalanativelib: Support for incremental compilation since Scala Native 0.4.9

contrib.testng: The TestNG library is no longer provided transitively; you need to provide it explicitly

contrib.bloop: Fixed re-generation of bloop config dir; previously, it could happen, that there where no config files at all

BSP: implement buildTarget/OutputPaths request

Various version bumps and internal improvements

Hardened Maven and Ivy artifact handling to prevent path-traversal attacks (see CVE-2022-37866), also updated coursier dependency to a non-vulnerable version

Decoupled mill-moduledefs module into a {link-mill-moduledefs}[separate project], to better suite compiler plugin packaging and improve support for various Scala versions

Applied more workarounds to coursier concurrency issues to make parallel builds more robust

Added support for newer Scala versions in GenIdea (2.2 and 2.3)

Fixed an issue where PublishModule dropped module dependencies when mixed-in after other trait which overrode moduleDeps

new JMH contrib plugin

Lots of internal improvements and dependency updates

Improvements for better Scala 3.2 support

Fixed non-working default commands in cross modules

CoursierModule: mitigate more download failure situations (e.g. checksum failures)

PublishModule: properly show gpg output in server mode

BSP: Better compiler message handling (logMessage instead of showMessage) and support for diagnostic code

ScoverageModule: Support for Scoverage 2.x

New contrib module GitlabPublishModule

Various internal improvements and version bumps

Documentation improvements

Don’t print unwanted debug messages from zinc

PathRefs sigs are now more reproducible and independent of the used filesystem

JavaModule can now use a non-local Java Compiler to support all options

Logger: new debugEnabled to detect whether debug logging is enabled

New testkit module, to use TestEvaluator in external projects

Fixed reading of .mill-jvm-opts in server mode

BSP: Automatic SemanticDB enablement to improve Metals support

mill.twirllib.TwirlModule - new mandatory target twirlScalaVersion to configure the Scala version used by Twirl compiler, and support for newer versions

Lots of documentation updates and additions

Upgraded to Zinc 1.7.1 and various other dependency updates

New init command, to create new Mill projects from Gitter8 (g8) templates

PathRef now gracefully ignores socket files. This also fixes an annoying issue when Mill was previously ran in a source directory.

Fixed a bug with using mill --repl without any further arguments, which was introduced in Mill 0.10.2 and prevented proper no-server mode

Fixed the visualize command which wasn’t working on some newer JREs

Improved Mill server support for Windows 11 and some Windows Server versions

ScalaModule / ZincWorkerModule: Fixed incremental compilation issue with JRE 17 (and probably others)

TestModule now better supports JUnit5 test suites

ScalaJsModule: internal improvements to the stability of the Scala.js linker

ScalaNativeModule: Added support for nativeEmbedResources

BSP: improved handling of the mill-build module when the BSP client is IntelliJ IDEA

Documentation updates and link fixes

Various dependency updates

Switched from ipcsocket to junixsocket library to enhance the robustness of Mill client server communication. This should greatly improve the user experience on Windows.

Internal improvements and better support of GraalVM

The Mill Documentation site has now built-in search functionality

ScalaJsModule: New targets fastLinkJS and fullLinkJS and deprecated fastOpt and fullOpt

ScalaJsModule: Support for ModuleSplitStyle

BSP: Updated to protocol version 2.1.0-M1, added support for test framework names and support for the JVM extension

GenIdea: More consistent ordering of libraries and dependent modules and support for Scala 3.1 language level

Bloop: Added support for runtime dependencies

Enhanced test suite to cover Mill client server scenarios

Various dependency updates

Fixed import $file for files with hyphens and other symbols in its name

Fixed an issues with truncated output just before Mill finishes

Mill commands now support arguments of type Task[T], which can improve writing re-usable commands, especially, they can be called from other tasks more easily

JavaModule: Improved correctness and performance of compileClasspath and bspCompileClasspath targets. This fixes an issue with BSP for large projects. Also, compile-time dependencies no longer sneak into the classpath transitively.

JavaModule: Added docJarUseArgsFile target and fix issue with Windows command length restrictions in docJar

BSP and Bloop: Better detect foreign modules

Various internal API refinements and improvements

Reorganized integration test suite and build setup

Mill workers can now implement AutoCloseable to properly free resources

ScalaModule: Fixed repl start

CoursierModule: Fixed concurrent download issues with coursier (we detect and retry)

MainModule: Fixed potential match error with show and showNamed

Restructured contrib module documentation

Internal improvements

MillClienMain can now act as universal main to start mill with or without a server process

Improved show command that always returns valid JSON

Added showNamed command that includes the task names in the output

Implemented more granular cache invalidation which keeps more caches intact when you split your build setup over multiple .sc files with import $file.

The local .mill-jvm-opts file is no longer restricted to -X options

CoursierModule: Added coursierCacheCustomizer to support a FileCache customizers

JavaModule: the docJar target no longer includes hidden files

ScalaModule: Updated to latest zinc version

ScalaModule: Reworked scalac plugins handling for the better and to support Scala 3

ScalaNativeModule: fixed Dep.withDottyCompat behavior

ScalaJSModule: support for linking multiple modules

ScalafmtModule: Support for newer Scalafmt versions

Tool chain: Update to Mill 0.10.0

Tool chain: we no longer create files outside the mill project directory (e.g. ~/mill-release is now under target/mill-release)

Various dependency updates

Lots of internal improvements

Changed structure of out directory, out/foo/dest is now out/foo.dest

Fixed issues with loading of predef scripts

--watch now supports manual re-runs by pressing enter

Improved subprocess handling

Published poms can now contain properties and versionScheme information

Improved Scala.js support, including more target configuration options and support for Node 17

Improved Scala Native for version > 0.4.2 and support Scala 3

Internal improvements, fixes and dependency version updates

Fixed Log4Shell security vulnerability in ZincWorkerModule (CVE-2021-44228)

Factored out the testrunner into a new module, which also fixes some potential classloader issues when executing tests (e.g. with JNA)

Removed the limitation of max 22 inputs for tasks

--watched commands can now re-run when pressing enter-key

task and arguments of commands can now have hyphens in their name

Reworked and decluttered the out-folder structure

prepareOffline now has a all flag to control if all or only some dependency should be prefetched

Made caching more effective for targets overridden in stackable-traits

Further BSP improvements, esp. for Metals and Scala 3

Lots of other internal improvements and fixes

Various dependency updates

BSP support rework and overhaul of built-in BSP server

GenIdea: failures when inspecting and resolving the build are not properly reported

Coursier: we now implemented a workaround to tackle concurrent downloads issues

New + separator to provide multiple targets (with parameters) via cmdline

New --import cmdline option to run ad-hoc plugins without editing of build.sc

New T.ctx().workspace API to access the project root directory

Various internal improvements and bug fixes

Various refactorings and cleanups

ScalaModule with PublishModule: the scala-library artifact is now always part of the dependencies in published `pom.xml`s and `ivy.xml`s

New JavaModule.mandatoryIvyDeps target to provide essential dependencies like scala-library without forcing the user to call super.ivyDeps

ScalaJSModule.scalaLibraryIvyDeps no longer contains the scala-js-library, but only the scala-library; if you need that, use ScalaJSModule.mandatoryIvyDeps instead.

import $ivy support $MILL_BIN_PLATFORM variable and a new sort notations for external plugins

We fixed and enabled lots of tests to run on Windows

Some generic targets like plan or path now also return their output

GenIdea: improved support for Scala 3 projects *

Removed deprecated API

ScalaModule: added mandatoryScalacOptions to avoid the common issue that users forget to include mandatory options when defining their own.

Renamed toolsClasspath targets found in various modules to avoid hard to resolve clashes when mixing traits

Fixed and improved our test suite on Windows

Various fixes and improvements

Various dependency updates

fixed parsing of command parameters in show command

zinc worker: Updated log4j2 to 2.17.1

zinc worker: Updated log4j2 to 2.16.0 to fix Log4Shell (CVE-2021-44228) vulnerability

Some feature backports from mill 0.10

New + separator to provide multiple targets (with parameters) via cmdline

New --import cmdline option to run ad-hoc plugins without editing of build.sc

import $ivy support $MILL_BIN_PLATFORM variable and a new sort notations for external plugins

BSP: Fixed/improved source item for root project

Bloop: Prevent compilation during bloop config generation

GenIdea: Fix content path of root project (mill-build)

Various version bumps

Fixed some potential binary incompatibilities with external plugins (builds against older os-lib versions)

Fixed location and configuration of mills home path (used for caching of build scripts)

Properly close jar resources - should fix issues in assembly, esp. on Windows where open resources are locked

BSP: Repaired mills BSP server

playlib: Fixed issues with the play-contrib module and added support for Play 2.8

GenIdea: changed dir for generated mill modules to .idea/mill_modules

Various version bumps, including Scala 2.13.5

ScalaModule: Support for Scala 3

CoursierModule: Support customized dependency resolution (needed to work with ScalaFX)

TestModule: Added new testFramework target and only support one test framework. Deprecated testFrameworks targets.

TestModule: Added new convenience traits to configure popular test frameworks, e.g. TestModule.Junit4, TestModule.ScalaTest, TestModule.Utest and many more

Bloop: Added support for foreign modules

Better support for Windows environments

Various internal improvements, cleanups, and deprecations

Various dependencies updates

Removed tut contrib module because of unmaintained/archived upstream dependency

repl and console targets now support forkArgs and forkEnv

Support for Scala 3 release candidates and new Scaladoc 3 tool

Support for Scala.js on Scala 3

Scala Native improvements

Test runner now uses an args file to support running tests on Windows

GenIdea: better supports source jars, full config contributions and provided/runtime dependencies

Various dependency updates

Documentation site reworked to support multiple release versions

Improved CI setup to better test mill on Windows

Updated zinc to 1.4.4

Support for Scala Native 0.4.0

Support for Scala.js ESModule (including Bloop support)

Inner Tests traits in modules like JavaModule, ScalaModule and others now have unique names (JavaModuleTests, ScalaTests, etc), to allow for easier customization

Various version bumps of dependencies

CI now runs all tests, it did miss some before

Implemented more BSP protocol commands and fixed some glitches with IntelliJ

Stabilized CI builds

Various fixes and improvements

Various version bumps

Replace the built in @main method functionality with the MainArgs library

Note that the MainArgs replacement has some backwards incompatibilities: Short flags like -i can no longer be passed via --i, the @doc("") is now @arg(doc = ""), Seq[T] parameters are now passed via repeated --foo flags rather than comma-separated.

Add the ability to relocate/shade files in .assembly #947

Twirl enhancements #952

Add scalacPluginClasspath to Tests #956

Add toMap methods to BuildInfo #958

Bump coursier to version 2.0.0 #973

Make BSP support a first-class citizen #969

Omit the suffix in artifactName in cross modules #953

Allow test classes with constructor parameters #982

Proguard contrib module #972

Support Scala.js useECMAScript2015 option and ModuleKind.ESModule #1004

Support Scala.js incremental linking #1007

Bump external dependencies: uPickle 1.2.0, Ammonite 2.2.0, etc.

Use default coursier repos (#931)

Work around relative paths issue on windows (#936)

Support Scala.js versions >1.0.0 (#934)

new command line options --repl and --no-server, deprecated --interactive option

Support for Scala.js 1.1

Fixed missing source maps for Scala.js 1.0 and 1.1

Improved BSP contrib module

Greatly improved parallel builds via -j <n>/--jobs <n>, with better scheduling and utilization of multiple cores

build.sc files now uses Scala 2.13.2

Avoid duplicate target resolution with mill resolve __

Add ability to pass GPG arguments to publish via --gpgArgs

-w/--watch now works for T.source targets

Finished incomplete support to publish extra artifacts to IVY repositories (publishLocal)

Improved Sonatype uploads

GenIdea: improvements for shared source dirs and skipped modules

ScoverageModule: Some refactorings to allow better customization

More robust classpath handling under Windows

Mill can now execute targets in parallel. This is experimental and need to be enabled with --jobs <n> option.

PublishModule: new publishM2Local to publish into local Maven repositories

PublishModule: enhanced publishLocal to specify to ivy repository location

Windows: Fixed windows launcher and more robust classpath handling

ScalaNativeModule: improved compiling and linking support

new contrib module VersionFile

Dependency: improved dependency update checker and expose results for programmatic use

ǹew contrib module Bintray

ǹew contrib module Artifactory

fixed testCached support in various modules

GenIdea: improvements, esp. related to source jars

Bugfix: Mill now no longer leaks open files (version bump to uPickle 1.0.0)

New --version option

Added Support for Scala.js 1.0.0+

Added Support for Scala Native 0.4.0-M2

JavaModule: Enhanced ivyDepsTree to optionally include compile-time and runtime-time dependencies

JavaModule: allSourceFiles no longer include Scala sources

JavaModule: assembly supports configurable separator when merging resources

ScoverageModule: respect unmanagedClasspath, added console reporter

ScalaPBModule: added more configuration options

Bloop: Fixed inconsistent working directory when executing tests via bloop (forces -Duser.dir when generating bloop config)

Support for METALS 0.8.0 in VSCode

Bump library versions again

Alias T.ctx. functions to T.: T.dest, T.log, etc.

Bump Mill’s client-connect-to-server timeout, to reduce flakiness when the server is taking a moment to start up

Bump library versions: Ammonite 2.0.1, uPickle 0.9.6, Scalatags 0.8.3, OS-Lib 0.6.2, Requests 0.4.7, Geny 0.4.2

Bump library versions: Ammonite 1.9.2, uPickle 0.9.0, Scalatags 0.8.2, OS-Lib 0.5.0, Requests 0.3.0, Geny 0.2.0, uTest 0.7.1

Fixed a long standing issue that output of sub-processes are only shown when -i option was used. Now, you will always seen output of sub-process.

Mill now properly restarts it’s server after it’s version has changed

PublishModule: added ability to publish into non-staging repositories

ScalaPBModule: added extra include path option

GenIdea/idea: improved support for generated sources and use/download sources in more cases

ScalaJS: improvements and support for ScalaJS 0.6.29+ and 1.0.1.RC1

Introduced new CoursierModule to use dependency management independent from a compiler

ScoverageModule: better handling of report directories

ScalaPBModule: more configuration options

various other fixes and improvements

TestModule: new `testCached`target, which only re-runs tests after relevant changes

TestModule.test: fixed issue when stacktraces have no filename info

Dependency/updates: fixed issue with reading stale dependencies

GenIdea/idea: no longer shared output directories between mill and IntelliJ IDEA

support for Dotty >= 0.18.1

Fixed backwards compatibility of mill wrapper script

Mill now support the Build Server Protocol 2.0 (BSP) and can act as a build server

bloop: removed semanticDB dependency

Documentation updates

GenIdea: Bug fixes

GenIdea: Support for module specific extensions (Facets) and additional config files

Add ability to define JAR manifests

Dotty support: Updates and support for binary compiler bridges

Ivy: improved API to create optional dependendies

Interpolate $MILL_VERSION in ivy imports

Zinc: Fixed logger output

Scoverage: Upgrade to Scoverage 1.4.0

Flyway: Upgrade to Flyway 6.0.1

Bloop: Updated semanticDB version to 4.2.2

Documentation updates

Improved robustness in release/deployment process

Mill now supports a ./mill {link-current-doc-site}/#bootstrap-scripts-linuxos-x-only[bootstrap script], allowing a project to pin the version of Mill it requires, as well as letting contributors use ./mill …​ to begin development without needing to install Mill beforehand.

Support for a .mill-version file or MILL_VERSION environment variable for {link-current-doc-site}/#overriding-mill-versions[Overriding Mill Versions]

Fix scoverage: inherit repositories from outer project #645

Improvements to IntelliJ project generation #616

Allow configuration of Scala.js' JsEnv #628

Fixes for scala native test suites without test frameworks #627

Fix publication of artifacts by increasing sonatype timeouts

Bug fixes for Scoverage integration #623

Publish compileIvyDeps as provided scope (535)

Added contrib modules to integrate {link-current-doc-site}/page/contrib-modules.html#bloop[Bloop], {link-current-doc-site}/page/contrib-modules.html#flyway[Flyway], {link-current-doc-site}/page/contrib-modules.html#play-framework[Play Framework], {link-current-doc-site}/page/contrib-modules.html#scoverage[Scoverage]

Allow configuration of GPG key names when publishing (530)

Bump Ammonite version to 1.6.7, making Requests-Scala available to use in your build.sc

Support for Scala 2.13.0-RC2

ScalaFmt support now uses the version specified in .scalafmt.conf

Started to splitting out mill.api from mill.core

Avoid unnecessary dependency downloading by providing fetches per cache policy

Added detailed dependency download progress to the progress ticker

Fixed internal code generator to support large projects

Zinc worker: compiler bridge can be either pre-compiled or on-demand-compiled

Zinc worker: configurable scala library/compiler jar discovery

Zinc worker: configurable compiler cache supporting parallelism

Version bumps: ammonite 1.6.0, scala 2.12.8, zinc 1.2.5

Mill now by default fails fast, so in case a build tasks fails, it exits immediately

Added new -k/--keep-going commandline option to disable fail fast behaviour and continue build as long as possible in case of a failure

Bump uPickle to 0.7.1

Mill is now bundled with OS-Lib, providing a simpler way of dealing with filesystem APIs and subprocesses

Added new debug method to context logger, to log additional debug info into the task specific output dir (out/<task>/log)

Added --debug option to enable debug output to STDERR

Fix ScalaModule#docJar task when Scala minor versions differ 475

Automatically detect main class to make ScalaModule#assembly self-executable

Bump Ammonite to 1.3.2, Fastparse to 2.0.4

Sped up ScalaModule#docJar task by about 10x, greatly speeding up publishing

Add a flag JavaModule#skipIdea you can override to disable Intellij project generation #458

Allow sub-domains when publishing #441

mill inspect now displays out the doc-comment documentation for a task.

Avoid shutdown hook failures in tests #422

Ignore unreadable output files rather than crashing #423

Don’t compile hidden files #428

Add visualizePlan command

Basic build-info plugin in mill-contrib-buildinfo

ScalaPB integration in mill-contrib-scalapblib

Fixes for Twirl support, now in mill-contrib-twirllib

Support for building Dotty projects #397

Allow customization of run/runBackground working directory via forkWorkingDir

Reduced executable size, improved incremental compilation in #414

Improve incremental compilation to work with transitive module dependencies

Speed up hot compilation performance by properly re-using classloaders

Speed up compilation time of build.sc files by removing duplicate macro generated routing code

Add .runBackground and .runMainBackground commands, to run something in the background without waiting for it to return. The process will keep running until it exits normally, or until the same .runBackground command is run a second time to spawn a new version of the process. Can be used with -w for auto-reloading of long-running servers.

{link-current-doc-site}/page/common-project-layouts.html#scala-native-modules[Scala-Native support]. Try it out!

Add --disable-ticker to reduce spam in CI

Fix propagation of --color flag

Fix resolution of scala-{library,compiler,reflect} in case of conflict

Allow configuration of JavaModule and ScalafmtModule scala workers

Allow hyphens in module and task names

Fix publishing of ScalaJS modules to properly handle upstream ScalaJS dependencies

Added the {link-current-doc-site}/#visualize[mill show visualize] command, making it easy to visualize the relationships between various tasks and modules in your Mill build.

Improve Intellij support (351): better jump-to-definition for third-party libraries, no longer stomping over manual configuration, and better handling of import $ivy in your build file.

Support for un-signed publishing and cases where your GPG key has no passphrase (346)

Basic support for Twirl, Play Framework’s templating language (271)

Better performance for streaming large amounts of stdout from Mill’s daemon process.

Allow configuration of append/exclude rules in ScalaModule#assembly (309)

Preserve caches when transitioning between -i/--interactive and the fast client/server mode (329)

Keep Mill daemon running if you Ctrl-C during -w/--watch mode (327)

Allow mill version to run without a build file (328)

Make docJar (and thus publishing) robust against scratch files in the source directories (334) and work with Scala compiler options (336)

Allow passing Ammonite command-line options to the foo.repl command (333)

Add mill clean (315) to easily delete the Mill build caches for specific targets

Improve IntelliJ integration of `MavenModule`s/`SbtModule`s' test folders (298)

Avoid showing useless stack traces when foo.test result-reporting fails or foo.run fails

ScalaFmt support (308)

Allow ScalaModule#generatedSources to allow single files (previous you could only pass in directories)

Universal (combined batch/sh) script generation for launcher, assembly, and release (#264)

Windows client/server improvements (#262)

Windows repl support (note: MSYS2 subsystem/shell will be supported when jline3 v3.6.3 is released)

Fixed Java 9 support

Remove need for running publishAll using --interactive when on OSX and your GPG key has a passphrase

First-class support for `JavaModule`s

Properly pass compiler plugins to Scaladoc (#282)

Support for ivy version-pinning via ivy"…​".forceVersion()

Support for ivy excludes via ivy"…​".exclude() (#254)

Make ivyDepsTree properly handle transitive dependencies (#226)

Fix handling of runtime-scoped ivy dependencies (#173)

Make environment variables available to Mill builds (#257)

Support ScalaCheck test runner (#286)

Support for using Typelevel Scala (#275)

If a module depends on multiple submodules with different versions of an ivy dependency, only one version is resolved (#273)

Support for non-interactive (client/server) mode on Windows.

More fixes for Java 9

Bumped the Mill daemon timeout from 1 minute to 5 minutes of inactivity before it shuts down.

Avoid leaking Node.js subprocesses when running ScalaJSModule tests

Passing command-line arguments with spaces in them to tests no longer parses wrongly

ScalaModule#repositories, scalacPluginIvyDeps, scalacOptions, javacOptions are now automatically propagated to Tests modules

ScalaJSModule linking errors no longer show a useless stack trace

ScalaModule#docJar now properly uses the compileClasspath rather than runClasspath

Bumped underlying Ammonite version to 1.1.0, which provides the improved Windows and Java 9 support

Fixes for non-interactive (client/server) mode on Java 9

Windows batch (.bat) generation for launcher, assembly, and release

Introduced the mill plan foo.bar command, which shows you what the execution plan of running the foo.bar task looks like without actually evaluating it.

Mill now generates an out/mill-profile.json file containing task-timings, to make it easier to see where your mill evaluation time is going

Introduced ScalaModule#ivyDepsTree command to show dependencies tree

Rename describe to inspect for consistency with SBT

mill resolve now prints results sorted alphabetically

Node.js configuration can be customised with ScalaJSModule#nodeJSConfig

Scala.js fullOpt now uses Google Closure Compiler after generating the optimized Javascript output

Scala.js now supports NoModule and CommonJSModule module kinds

Include compileIvyDeps when generating IntelliJ projects

Fixed invalid POM generation

Support for Java 9 (and 10)

Fixes for Windows support

Fixed test classes discovery by skipping interfaces

Include "optional" artifacts in dependency resolution if they exist

out/{module_name} now added as a content root in generated IntelliJ project

Speed up Mill client initialization by another 50-100ms

Speed up incremental `assembly`s in the common case where upstream dependencies do not change.

Make ScalaJSModule#run work with main-method discovery

Make ScalaWorkerModule user-defineable, so you can use your own custom coursier resolvers when resolving Mill’s own jars

Simplify definitions of SCM strings

Make the build REPL explicitly require -i/--interactive to run

Log a message when Mill is initializing the Zinc compiler interface

Greatly reduced the overhead of evaluating Mill tasks, with a warm already-cached mill dev.launcher now taking ~450ms instead of ~1000ms

Mill now saves compiled build files in ~/.mill/ammonite, which is configurable via the --home CLI arg.

Fixed linking of multi-module Scala.js projects

Mill now keeps a long-lived work-daemon around in between commands; this should improve performance of things like compile which benefit from the warm JVM. You can use -i/--interactive for interactive consoles/REPLs and for running commands without the daemon

Implemented the ScalaModule#launcher target for easily creating command-line launchers you can run outside of Mill

ScalaModule#docJar no longer fails if you don’t have scala-compiler on classpath

Support for multiple testFrameworks in a test module.

Fixes for foo.console

Enable Ammonite REPL integration via foo.repl

First public release