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Pin Scala 3 dependencies to the 3.3.x LTS line #122

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Merged
alexarchambault merged 2 commits into from
Sep 9, 2026
Merged

Pin Scala 3 dependencies to the 3.3.x LTS line #122

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4c072bc
Pin Scala 3 dependencies to the 3.3.x LTS line
alexarchambault Sep 9, 2026
5477857
Check Scala 3 bin compat against Scala 3 artifacts
alexarchambault Sep 9, 2026
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7 changes: 7 additions & 0 deletions .scala-steward.conf
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
# Stay on the Scala 3 LTS line (3.3.x), don't update to 3.4.x and later
updates.pin = [
{ groupId = "org.scala-lang", artifactId = "scala3-library", version = { prefix = "3.3." } },
{ groupId = "org.scala-lang", artifactId = "scala3-library_sjs1", version = { prefix = "3.3." } },
{ groupId = "org.scala-lang", artifactId = "scala3-library_native0.5", version = { prefix = "3.3." } },
{ groupId = "org.scala-lang", artifactId = "scala3-compiler", version = { prefix = "3.3." } }
]
21 changes: 17 additions & 4 deletions build.mill
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Expand Up @@ -100,11 +100,13 @@ trait VersionsPublishModule extends PublishModule with VersionsMima {
trait Versions extends Cross.Module[String] with ScalaModule with VersionsPublishModule {
def artifactName = "versions"
def scalaVersion = crossValue
// first version with Scala 3 artifacts
private def scala3CutOff = "0.6.0"
def mimaPreviousVersions = Task {
import _root_.coursier.version.Version
val previousVersions = super.mimaPreviousVersions()
if (scalaVersion().startsWith("3.")) {
val cutOff = Version("0.6.0")
val cutOff = Version(scala3CutOff)
previousVersions
.map(Version(_))
.filter(_ >= cutOff)
Expand All @@ -113,12 +115,23 @@ trait Versions extends Cross.Module[String] with ScalaModule with VersionsPublis
previousVersions
}
def mimaPreviousArtifacts = Task {
import _root_.coursier.version.Version
val artifacts = super.mimaPreviousArtifacts()
if (scalaVersion().startsWith("3.")) {
// Before the first Scala 3 artifacts, Scala 3 users relied on the Scala 2.13 ones,
// so check binary compatibility against those too. From that version on, the Scala 3
// artifacts above are the ones to check against - the Scala 2.13 ones differ from
// them in ways that are expected (case class unapply signature, default arguments
// getters, …).
val cutOff = Version(scala3CutOff)
val artifactId213 = artifactId().stripSuffix("_3") + "_2.13"
val artifacts213 = super.mimaPreviousVersions().distinct.map(version =>
mvn"${pomSettings().organization}:$artifactId213:$version"
)
val artifacts213 = super.mimaPreviousVersions()
.distinct
.map(Version(_))
.filter(_ < cutOff)
.map(version =>
mvn"${pomSettings().organization}:$artifactId213:${version.repr}"
)
artifacts ++ artifacts213
} else
artifacts
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