Setup Mima

.github/workflows/ci.yml

@@ -219,6 +219,31 @@ jobs:
     steps:
       - uses: release-drafter/release-drafter@v5
 
+  mima_check:
+    name: Mima Check
+    if: ${{ github.event_name == 'pull_request' }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        scala: [2.13.10]
+        java: [temurin@21]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout current branch (full)
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup Java (temurin@21)
+        if: matrix.java == 'temurin@21'
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+          cache: sbt
+
+      - run: sbt mimaChecks
+
   unsafeRunScoverage:
     name: Unsafe Scoverage
     strategy:

aliases.sbt

@@ -3,9 +3,11 @@ addCommandAlias("fmtCheck", "scalafmtCheck; Test / scalafmtCheck; sFixCheck")
 addCommandAlias("sFix", "scalafix OrganizeImports; Test / scalafix OrganizeImports")
 addCommandAlias("sFixCheck", "scalafix --check OrganizeImports; Test / scalafix --check OrganizeImports")
 addCommandAlias("generateMediaTypes", "zioHttpTools/runMain zio.http.tools.GenerateMediaTypes")
+addCommandAlias("mimaChecks", "zioHttpJVM/mimaReportBinaryIssues; zioHttpHtmx/mimaReportBinaryIssues"
+  )
 
 onLoadMessage := {
-  import scala.Console._
+  import scala.Console.*
 
   def header(text: String): String  = s"${RED}$text${RESET}"
   def item(text: String): String    = s"${GREEN}> ${CYAN}$text${RESET}"

build.sbt

@@ -33,6 +33,13 @@ ThisBuild / githubWorkflowAddedJobs    :=
       steps = List(WorkflowStep.Use(UseRef.Public("release-drafter", "release-drafter", s"v${releaseDrafterVersion}"))),
       cond = Option("${{ github.base_ref == 'main' }}"),
     ),
+    WorkflowJob(
+      id = "mima_check",
+      name = "Mima Check",
+      steps = WorkflowStep.CheckoutFull +: WorkflowStep.SetupJava(List(JavaSpec.temurin("21"))) :+  WorkflowStep.Sbt(List("mimaChecks")),
+      cond = Option("${{ github.event_name == 'pull_request' }}"),
+      javas = List(JavaSpec.temurin("21")),
+    ),
   ) ++ ScoverageWorkFlow(50, 60) ++ JmhBenchmarkWorkflow(1) ++ BenchmarkWorkFlow()
 
 ThisBuild / githubWorkflowTargetTags ++= Seq("v*")
@@ -176,6 +183,7 @@ lazy val zioHttp = crossProject(JSPlatform, JVMPlatform)
     },
     libraryDependencies ++= netty ++ Seq(`netty-incubator`),
   )
+  .jvmSettings(MimaSettings.mimaSettings(failOnProblem = true))
   .jsSettings(
     ThisProject / fork := false,
     testFrameworks     := Seq(new TestFramework("zio.test.sbt.ZTestFramework")),
@@ -274,6 +282,7 @@ lazy val zioHttpHtmx = (project in file("zio-http-htmx"))
     ),
   )
   .dependsOn(zioHttpJVM)
+  .settings(MimaSettings.mimaSettings(failOnProblem = true))
 
 lazy val zioHttpExample = (project in file("zio-http-example"))
   .settings(stdSettings("zio-http-example"))

project/MimaSettings.scala

@@ -0,0 +1,18 @@
+import com.typesafe.tools.mima.core.*
+import com.typesafe.tools.mima.core.ProblemFilters.*
+import com.typesafe.tools.mima.plugin.MimaKeys.*
+import sbt.{Def, *}
+import sbt.Keys.{name, organization}
+import sbtdynver.DynVerPlugin.autoImport.*
+
+object MimaSettings {
+  def mimaSettings(failOnProblem: Boolean): Seq[Def.Setting[?]] =
+    Seq(
+      mimaPreviousArtifacts ++= previousStableVersion.value.map(organization.value %% name.value % _).toSet,
+      mimaBinaryIssueFilters ++= Seq(
+        exclude[Problem]("zio.http.internal.*"),
+        exclude[Problem]("zio.http.codec.internal.*"),
+      ),
+      mimaFailOnProblem := failOnProblem
+    )
+}

project/plugins.sbt

@@ -14,6 +14,7 @@ addSbtPlugin("org.scala-js"       % "sbt-scalajs"               % "1.16.0")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject"  % "1.3.2")
 addSbtPlugin("com.thesamet"       % "sbt-protoc"                % "1.0.7")
 addSbtPlugin("com.thesamet"       % "sbt-protoc-gen-project"    % "0.1.8")
+addSbtPlugin("com.typesafe"       % "sbt-mima-plugin"           % "1.1.4")
 
 addSbtPlugin("org.jetbrains.scala" % "sbt-ide-settings" % "1.1.2")