Use Gradle Kotlin DSL

minecraft/libraries/HMCLTransformerDiscoveryService/build.gradle

@@ -1,17 +0,0 @@
-version '1.0'
-
-dependencies {
-    compileOnly project.files("lib/modlauncher-4.1.0.jar")
-}
-
-compileJava {
-    sourceCompatibility = 8
-    targetCompatibility = 8
-}
-
-jar {
-    manifest {
-        attributes 'Created-By': 'Copyright(c) 2013-2020 huangyuhui.',
-                'Implementation-Version': project.version
-    }
-}

minecraft/libraries/HMCLTransformerDiscoveryService/build.gradle.kts

@@ -0,0 +1,19 @@
+version = "1.0"
+
+dependencies {
+    compileOnly(project.files("lib/modlauncher-4.1.0.jar"))
+}
+
+tasks.compileJava {
+    sourceCompatibility = "1.8"
+    targetCompatibility = "1.8"
+}
+
+tasks.jar {
+    manifest {
+        attributes(
+            "Created-By" to "Copyright(c) 2013-2020 huangyuhui.",
+            "Implementation-Version" to project.version
+        )
+    }
+}