A new module for Kotlin sources

api/build.gradle.kts

@@ -0,0 +1,32 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
+
+plugins {
+  kotlin("jvm") version "2.0.21"
+  `java-gradle-plugin`
+}
+
+java {
+  sourceCompatibility = JavaVersion.VERSION_1_8
+  targetCompatibility = JavaVersion.VERSION_1_8
+}
+
+kotlin {
+  explicitApi()
+  compilerOptions {
+    // https://docs.gradle.org/current/userguide/compatibility.html#kotlin
+    apiVersion = KotlinVersion.KOTLIN_1_8
+    jvmTarget = JvmTarget.JVM_1_8
+  }
+}
+
+dependencies {
+  implementation("org.jdom:jdom2:2.0.6.1")
+  implementation("org.ow2.asm:asm-commons:9.7.1")
+  implementation("commons-io:commons-io:2.17.0")
+  implementation("org.apache.ant:ant:1.10.15")
+  implementation("org.codehaus.plexus:plexus-utils:4.0.2")
+  implementation("org.codehaus.plexus:plexus-xml:4.0.4")
+  implementation("org.apache.logging.log4j:log4j-core:2.24.1")
+  implementation("org.vafer:jdependency:2.11")
+}

api/src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/legacy/LegacyShadowPlugin.kt

@@ -0,0 +1,13 @@
+package com.github.jengelman.gradle.plugins.shadow.legacy
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+
+/**
+ * Empty plugin to still have the `com.github.johnrengelman.shadow` plugin applied.
+ *
+ * This allows older build logic to keep on working as if that old plugin ID was applied.
+ */
+public class LegacyShadowPlugin : Plugin<Project> {
+  override fun apply(project: Project): Unit = Unit
+}

build.gradle.kts

@@ -37,6 +37,7 @@ spotless {
 
 dependencies {
   compileOnly(localGroovy())
+  api(projects.api)
 
   implementation("org.jdom:jdom2:2.0.6.1")
   implementation("org.ow2.asm:asm-commons:9.7.1")

settings.gradle.kts

@@ -30,3 +30,6 @@ dependencyResolutionManagement {
 rootProject.name = "shadow"
 
 enableFeaturePreview("STABLE_CONFIGURATION_CACHE")
+enableFeaturePreview("TYPESAFE_PROJECT_ACCESSORS")
+
+include(":api")