Change default Scala version to 3.8.0

This Scala CLI version switches the default Scala version to 3.8.0.

scala-cli version
# Scala CLI version: 1.12.0
# Scala version (default): 3.8.0

Added by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4049

Support for Scala.js 1.20.2

This Scala CLI version adds support for Scala.js 1.20.2.

scala-cli -e 'println("Hello")' --js
# Compiling project (Scala 3.8.0, Scala.js 1.20.2)
# Compiled project (Scala 3.8.0, Scala.js 1.20.2)
# Hello

Added by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4040

New aliases for RC and nightly Scala versions

This Scala CLI version introduces dedicated aliases for calling the latest Scala Release Candidate versions in a given series (including LTS).

scala-cli -e 'println(scala.util.Properties.versionNumberString)' -S rc
# 3.8.1-RC1
scala-cli -e 'println(scala.util.Properties.versionNumberString)' -S 3.rc
# 3.8.1-RC1
scala-cli -e 'println(scala.util.Properties.versionNumberString)' -S 3.8.rc
# 3.8.1-RC1
scala-cli -e 'println(dotty.tools.dotc.config.Properties.simpleVersionString)' -S 3.lts.rc --with-compiler
# 3.3.7-RC2
scala-cli -e 'println(dotty.tools.dotc.config.Properties.simpleVersionString)' -S lts.rc --with-compiler
# 3.3.7-RC2

Dedicated default and LTS nightly aliases are also provided.

scala-cli -e 'println(scala.util.Properties.versionNumberString)' -S nightly
# 3.8.2-RC1-bin-20260115-6151803-NIGHTLY
scala-cli -e 'println(dotty.tools.dotc.config.Properties.simpleVersionString)' -S lts.nightly --with-compiler
# 3.3.8-RC1-bin-20260112-d35b2d4-NIGHTLY-git-d35b2d4
scala-cli -e 'println(dotty.tools.dotc.config.Properties.simpleVersionString)' -S 3.lts.nightly --with-compiler
# 3.3.8-RC1-bin-20260112-d35b2d4-NIGHTLY-git-d35b2d4

Also note that there is no easy way to identify an RC for Scala 2 / 2.12 / 2.13 (as a particular nightly serves as the RC for those Scala distributions). A reasonable error is also provided when it is requested.

scala-cli -e 'println(scala.util.Properties.versionNumberString)' -S 2.rc
# Invalid Scala version: 2.rc. In the case of Scala 2, a particular nightly version serves as a release candidate.
scala-cli -e 'println(scala.util.Properties.versionNumberString)' -S 2.12.rc
# Invalid Scala version: 2.12.rc. In the case of Scala 2, a particular nightly version serves as a release candidate.
scala-cli -e 'println(scala.util.Properties.versionNumberString)' -S 2.13.rc
# Invalid Scala version: 2.13.rc. In the case of Scala 2, a particular nightly version serves as a release candidate.

Added by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4042 and https://github.com/VirtusLab/scala-cli/pull/4016

(⚡️ experimental) Support for exporting to Mill 1.0.x and overriding the Mill version with --mill-version

The export sub-command now allows to export to Mill 1.0.x projects.

@main def main() = println("Let's export to Mill 1.0.6!")

scala-cli export mill-1-0-6-export.scala --mill --mill-version 1.0.6 --power
# Exporting to a mill project...
# Exported to: ~/mill-export/dest

Added by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4028

Features & improvements

• Add rc & *.rc Scala version aliases by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4016
• Support export-ing to Mill 1.x.y & allow to override Mill version with --mill-version by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4028
• Improve Scala nightly version handling & add lts.nightly, 3.lts.nightly and nightly Scala version tags by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4042

Fixes

• Fix Scala 3.nightly and 3.latest-minor.nightly to consistently point to the same version by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4014
• fix #4005 - Windows native-image compile failure caused by SUBST collision by @philwalk in https://github.com/VirtusLab/scala-cli/pull/4006

Documentation changes

• Solve docs' website warnings by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4007
• Back port of documentation changes to main by @github-actions[bot] in https://github.com/VirtusLab/scala-cli/pull/4015

Build and internal changes

• Enable Scala Native tests with the test command on Scala 3 by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4018
• Self-contained docker build with ARM64 publishing by @keynmol in https://github.com/VirtusLab/scala-cli/pull/3962

Updates

• Update scala-cli.sh launcher for 1.11.0 by @github-actions[bot] in https://github.com/VirtusLab/scala-cli/pull/4004
• Bump Ammonite to 3.0.6 (was 3.0.5) by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4008
• Bump actions/download-artifact from 6 to 7 by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4009
• Bump actions/upload-artifact from 5 to 6 by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4010
• Bump sass from 1.95.0 to 1.96.0 in /website by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4011
• Bump react & react-dom from 19.2.1 to 19.2.3 in /website by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4012
• Bump Mill to 0.12.17 (was 0.12.16) by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4020
• Bump Scala Next RC to 3.8.0-RC4 by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4021
• Bump actions/checkout from 4 to 6 by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4024
• Bump qs from 6.14.0 to 6.14.1 in /website by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4032
• Bump @algolia/client-search from 5.46.0 to 5.46.2 in /website by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4030
• Bump sass from 1.96.0 to 1.97.1 in /website by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4027
• Bump actions/upload-artifact from 5 to 6 by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4023
• Bump actions/download-artifact from 6 to 7 by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4022
• Bump react-player from 2.16.1 to 3.4.0 in /website by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4025
• Bump Scala 3 Next RC to 3.8.0-RC5 by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4033
• Migrate to Mill 1.0.6 (was 0.12.17) by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4019
• Bump libsodium to 1.0.21 (partially, except for static launchers locked at 1.0.18) by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4041
• Bump coursier to 2.1.25-M23 by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4037
• Bump Scala 3 Next RC to 3.8.0-RC6 by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4039
• Bump Scala.js to 1.20.2 by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4040
• Bump sass from 1.97.1 to 1.97.2 in /website by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4038
• Bump alpine to 3.23 & relevant libsodium to 1.0.20 by @Gedochao in https://github.com/VirtusLab/scala-cli/pull/4047
• Bump @types/react from 19.2.7 to 19.2.8 in /website by @dependabot[bot] in https://github.com/VirtusLab/scala-cli/pull/4048

Full Changelog: https://github.com/VirtusLab/scala-cli/compare/v1.11.0...v1.12.0