feat: add wasm to build matrix

.github/workflows/pr-build.yaml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        lang: ['jvm', 'js', 'native']
+        lang: ['jvm', 'js', 'wasm', 'native']
         java: ['17', '21', '25']
     name: Sjsonnet build for ${{ matrix.lang }} on JDK ${{ matrix.java }}
     steps:
@@ -22,6 +22,11 @@ jobs:
           distribution: 'zulu'
           cache: sbt
       - uses: sbt/setup-sbt@v1
+      - name: Set up Node.js 24
+        if: ${{ matrix.lang == 'js' || matrix.lang == 'wasm' }}
+        uses: actions/setup-node@v6
+        with:
+          node-version: '24'
       - name: Cache Coursier cache
         uses: coursier/cache-action@bebeeb0e6f48ebad66d3783946588ecf43114433 # 6.4.8
       - name: Check Formatting

.github/workflows/release-build.yaml

@@ -18,6 +18,10 @@ jobs:
         with:
           java-version: 17
           distribution: 'zulu'
+      - name: Set up Node.js 24
+        uses: actions/setup-node@v6
+        with:
+          node-version: '24'
       - name: Set up environment variables
         run: |
           echo "VERSION=$(cat sjsonnet/version)" >> $GITHUB_ENV
@@ -26,21 +30,24 @@ jobs:
         run: ./mill "sjsonnet.jvm[$SCALA_VERSION].__.assembly"
       - name: JS Build
         run: ./mill "sjsonnet.js[$SCALA_VERSION].fullLinkJS"
+      - name: WASM Build
+        run: ./mill "sjsonnet.wasm[$SCALA_VERSION].fullLinkJS"
       - name: Playground Build
         run: ./mill playground.bundle
       - name: Rename Artifacts
         run: |
           mkdir release
           cp ./out/sjsonnet/js/$SCALA_VERSION/fullLinkJS.dest/main.js ./release/sjsonnet-$VERSION.js
           cp ./out/sjsonnet/js/$SCALA_VERSION/fullLinkJS.dest/main.js.map ./release/sjsonnet-$VERSION.js.map
+          cp -r ./out/sjsonnet/wasm/$SCALA_VERSION/fullLinkJS.dest/ ./release/sjsonnet-wasm-$VERSION/
           cp ./out/sjsonnet/jvm/$SCALA_VERSION/assembly.dest/out.jar ./release/sjsonnet-$VERSION.jar
           cp ./out/sjsonnet/jvm/$SCALA_VERSION/client/assembly.dest/out.jar ./release/sjsonnet-client-$VERSION.jar
           cp ./out/sjsonnet/jvm/$SCALA_VERSION/server/assembly.dest/out.jar ./release/sjsonnet-server-$VERSION.jar
           cp ./out/playground/bundle.dest/index.html ./release/sjsonnet-playground-$VERSION.html
       - uses: actions/upload-artifact@v6
         name: Upload Artifacts
         with:
-          name: sjsonnet-${{ env.VERSION }}-jvmjs
+          name: sjsonnet-${{ env.VERSION }}-jvmjswasm
           path: release/*
           retention-days: 1
           if-no-files-found: error

build.mill

@@ -143,11 +143,12 @@ object bench extends ScalaModule with JmhModule with ScalafmtModule {
 }
 
 object sjsonnet extends VersionFileModule {
-  object js extends Cross[SjsonnetJsModule](scalaVersions)
-  trait SjsonnetJsModule extends SjsonnetCrossModule with ScalaJSModule with SjsonnetPublishModule {
+  trait SjsonnetScalaJSModule
+      extends SjsonnetCrossModule
+      with ScalaJSModule
+      with SjsonnetPublishModule {
     def moduleDir = super.moduleDir / os.up
     def scalaJSVersion = "1.20.2"
-    def moduleKind = Task { ModuleKind.CommonJSModule }
     val sourceDirs = Seq(
       "src",
       "src-js",
@@ -160,8 +161,10 @@ object sjsonnet extends VersionFileModule {
         mvn"org.virtuslab::scala-yaml::0.3.0"
       )
 
-    object test extends ScalaJSTests with CrossTests {
-      def jsEnvConfig = JsEnvConfig.NodeJs(args = List("--stack-size=" + stackSizekBytes))
+    def nodeJsArgs: List[String] = List("--stack-size=" + stackSizekBytes)
+
+    trait SjsonnetScalaJSTests extends ScalaJSTests with CrossTests {
+      def jsEnvConfig = JsEnvConfig.NodeJs(args = nodeJsArgs)
       def resources = Task.Sources(
         this.moduleDir / "resources" / "test_suite",
         this.moduleDir / "resources" / "go_test_suite",
@@ -229,6 +232,21 @@ object sjsonnet extends VersionFileModule {
     }
   }
 
+  object js extends Cross[SjsonnetJsModule](scalaVersions)
+  trait SjsonnetJsModule extends SjsonnetScalaJSModule {
+    def moduleKind = Task { ModuleKind.CommonJSModule }
+    object test extends SjsonnetScalaJSTests
+  }
+
+  object wasm extends Cross[SjsonnetWasmModule](scalaVersions)
+  trait SjsonnetWasmModule extends SjsonnetScalaJSModule {
+    def moduleKind = Task { ModuleKind.ESModule }
+    def moduleSplitStyle = ModuleSplitStyle.FewestModules
+    def scalaJSExperimentalUseWebAssembly = true
+    override def nodeJsArgs = super.nodeJsArgs ++ List("--experimental-wasm-exnref")
+    object test extends SjsonnetScalaJSTests
+  }
+
   object native extends Cross[SjsonnetNativeModule](scalaVersions)
   trait SjsonnetNativeModule
       extends SjsonnetCrossModule