chore: 🤖 Cross compile for Scala 3.0.0-RC1

Author: gaeljw

build.sbt

@@ -33,6 +33,7 @@ ThisBuild / homepage := Some(
 val scala211 = "2.11.12"
 val scala212 = "2.12.13"
 val scala213 = "2.13.5"
+val scala3 = "3.0.0-RC1"
 
 scalaVersion := scala213
 
@@ -52,6 +53,7 @@ lazy val commonSettings = Seq(
       case Some((2, 11)) => ScalacOptions.scalacOptions211
       case Some((2, 12)) => ScalacOptions.scalacOptions212
       case Some((2, 13)) => ScalacOptions.scalacOptions213
+      case Some((3, 0))  => ScalacOptions.scalacOptions3
       case _             => Seq()
     }
   }
@@ -75,10 +77,12 @@ lazy val cucumberScala = (projectMatrix in file("cucumber-scala"))
     libraryDependencies ++= Seq(
       "io.cucumber" % "cucumber-core" % cucumberVersion,
       // Users have to provide it (for JacksonDefaultDataTableTransformer)
-      "com.fasterxml.jackson.module" %% "jackson-module-scala" % jacksonVersion % Provided,
+      ("com.fasterxml.jackson.module" %% "jackson-module-scala" % jacksonVersion % Provided)
+        .withDottyCompat(scalaVersion.value),
       "junit" % "junit" % junitVersion % Test,
       "io.cucumber" % "cucumber-junit" % cucumberVersion % Test,
-      "org.mockito" %% "mockito-scala" % mockitoScalaVersion % Test
+      ("org.mockito" %% "mockito-scala" % mockitoScalaVersion % Test)
+        .withDottyCompat(scalaVersion.value)
     ),
     libraryDependencies ++= {
       CrossVersion.partialVersion(scalaVersion.value) match {
@@ -102,7 +106,7 @@ lazy val cucumberScala = (projectMatrix in file("cucumber-scala"))
       Seq(file)
     }.taskValue
   )
-  .jvmPlatform(scalaVersions = Seq(scala213, scala212, scala211))
+  .jvmPlatform(scalaVersions = Seq(scala3, scala213, scala212, scala211))
 
 // Examples project
 lazy val examples = (projectMatrix in file("examples"))
@@ -116,7 +120,7 @@ lazy val examples = (projectMatrix in file("examples"))
     publishArtifact := false
   )
   .dependsOn(cucumberScala % Test)
-  .jvmPlatform(scalaVersions = Seq(scala213, scala212))
+  .jvmPlatform(scalaVersions = Seq(scala3, scala213, scala212))
 
 // Version policy check
 

project/ScalacOptions.scala

@@ -1,5 +1,19 @@
 object ScalacOptions {
 
+  val scalacOptions3 = Seq(
+    "-source:3.0",
+    "-deprecation", // Emit warning and location for usages of deprecated APIs.
+    "-explain", // Explain type errors in more detail.
+//    "-explaintypes", // Explain type errors in more detail.
+    "-feature", // Emit warning and location for usages of features that should be imported explicitly.
+    "-language:existentials", // Existential types (besides wildcard types) can be written and inferred
+    "-language:experimental.macros", // Allow macro definition (besides implementation and application)
+    "-language:higherKinds", // Allow higher-kinded types
+    "-language:implicitConversions", // Allow definition of implicit functions called views
+    "-unchecked", // Enable additional warnings where generated code depends on assumptions.
+    "-Xfatal-warnings" // Fail the compilation if there are any warnings.
+  )
+
   // Source: https://nathankleyn.com/2019/05/13/recommended-scalac-flags-for-2-13/
   val scalacOptions213 = Seq(
     "-deprecation", // Emit warning and location for usages of deprecated APIs.

project/plugins.sbt

@@ -1,6 +1,9 @@
 // Cross compilation matrix
 addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.7.0")
 
+// Scala 3 (Dotty)
+addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.5.3")
+
 // Scalafmt (formatter)
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.2")