Fix Gradle

buildSrc/src/main/kotlin/JNIPlugin.kt

@@ -5,18 +5,22 @@ import org.gradle.api.tasks.Delete
 import org.gradle.api.tasks.Exec
 import org.gradle.kotlin.dsl.*
 import java.io.File
+import java.util.concurrent.Callable
 
 class JNIPlugin : Plugin<Project> {
     open class JNIConfig(private val project: Project) {
-        fun addPlatform(name: String, libExtension: String) = project.run {
+        var root: File = File(project.rootDir, "src/main/c")
-            val cDir = File(projectDir.absolutePath, "src/main/c")
 
-            val buildDir = File(cDir, "build-${name}")
+        fun addPlatform(name: String, libExtension: String) = project.run {
+            val buildDir = Callable {
+                File(root, "build-${name}")
+            }
 
             tasks.register<Exec>("cmake-${name}") {
                 doFirst {
-                    if (!buildDir.exists()) {
+                    val file = buildDir.call()
-                        buildDir.mkdir()
+                    if (!file.exists()) {
+                        file.mkdir()
                     }
                 }
 

buildSrc/src/main/kotlin/TypeScriptPlugin.kt

@@ -15,8 +15,9 @@ class TypeScriptPlugin : Plugin<Project> {
     open class NPMTask : DefaultTask() {
         @get:Input
         lateinit var taskName: String
+        @get:Optional
         @get:Input
-        lateinit var outputDir: String
+        var outputDir: String? = null
 
         @TaskAction
         fun exec() {
@@ -39,14 +40,16 @@ class TypeScriptPlugin : Plugin<Project> {
             }
         }
 
+        @Optional
         @OutputDirectory
         fun getOutput(): Callable<File>? {
-            return if (this::outputDir.isInitialized) {
+            val dir = outputDir
+            return if (dir != null) {
                 Callable {
-                    if (File(outputDir).isAbsolute) {
+                    if (File(dir).isAbsolute) {
-                        File(outputDir)
+                        File(dir)
                     } else {
-                        File(project.the<TypeScriptConfig>().root, outputDir)
+                        File(project.the<TypeScriptConfig>().root, dir)
                     }
                 }
             } else {