Introduce scala 3 build for spray-json

Author: satabin

.github/workflows/ci.yml

@@ -80,11 +80,11 @@ jobs:
 
       - name: Make target directories
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main')
-        run: mkdir -p circe/jvm/target playJson/native/target testkit/native/target testkit/js/target core/.native/target playJson/jvm/target sprayJson/target core/.js/target circe/js/target core/.jvm/target circe/native/target playJson/js/target testkit/jvm/target project/target
+        run: mkdir -p circe/jvm/target playJson/native/target testkit/native/target testkit/js/target core/.native/target playJson/jvm/target core/.js/target circe/js/target core/.jvm/target circe/native/target playJson/js/target testkit/jvm/target sprayJson/.jvm/target project/target
 
       - name: Compress target directories
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main')
-        run: tar cf targets.tar circe/jvm/target playJson/native/target testkit/native/target testkit/js/target core/.native/target playJson/jvm/target sprayJson/target core/.js/target circe/js/target core/.jvm/target circe/native/target playJson/js/target testkit/jvm/target project/target
+        run: tar cf targets.tar circe/jvm/target playJson/native/target testkit/native/target testkit/js/target core/.native/target playJson/jvm/target core/.js/target circe/js/target core/.jvm/target circe/native/target playJson/js/target testkit/jvm/target sprayJson/.jvm/target project/target
 
       - name: Upload target directories
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main')

build.sbt

@@ -45,7 +45,8 @@ lazy val core = crossProject(JSPlatform, JVMPlatform, NativePlatform)
     ),
     mimaBinaryIssueFilters ++= List(
       ProblemFilters.exclude[DirectMissingMethodProblem](
-        "diffson.jsonpatch.package#simplediff#remembering.JsonDiffDiff")
+        "diffson.jsonpatch.package#simplediff#remembering.JsonDiffDiff"),
+      ProblemFilters.exclude[DirectAbstractMethodProblem]("diffson.lcs.Lcs.savedHashes")
     )
   )
 
@@ -58,13 +59,14 @@ lazy val testkit = crossProject(JSPlatform, JVMPlatform, NativePlatform)
                                         "org.scalacheck" %%% "scalacheck" % scalacheckVersion))
   .dependsOn(core)
 
-lazy val sprayJson = project
+lazy val sprayJson = crossProject(JVMPlatform)
+  .crossType(CrossType.Pure)
   .in(file("sprayJson"))
   .settings(commonSettings: _*)
   .settings(name := "diffson-spray-json",
-            crossScalaVersions := Seq(scala212, scala213),
-            libraryDependencies += "io.spray" %% "spray-json" % "1.3.6")
-  .dependsOn(core.jvm, testkit.jvm % Test)
+            libraryDependencies += "io.spray" %% "spray-json" % "1.3.6",
+            tlVersionIntroduced := Map("3" -> "4.4.1"))
+  .dependsOn(core, testkit % Test)
 
 lazy val playJson = crossProject(JSPlatform, JVMPlatform, NativePlatform)
   .crossType(CrossType.Full)

core/src/main/scala/diffson/lcs/HashedLcs.scala

@@ -26,7 +26,7 @@ import cats.implicits._
  */
 class HashedLcs[T: Eq](delegate: Lcs[Hashed[T]]) extends Lcs[T] {
 
-  def savedHashes = this
+  override def savedHashes: HashedLcs[T] = this
 
   override def lcs(seq1: List[T], seq2: List[T], low1: Int, high1: Int, low2: Int, high2: Int): List[(Int, Int)] = {
     // wrap all values and delegate to proper implementation