fuck java

src/main/kotlin/dev/zerozipp/loader/Knot.kt

@@ -7,9 +7,9 @@ import java.nio.file.Path
 class Knot(private val jar: Path) : ClassFileTransformer {
     private val knot = "net.fabricmc.loader.impl.launch.knot"
     private var registry = mutableSetOf<Instrumentation>()
-    override fun transform(classLoader: ClassLoader, className: String,
-        redefined: Class<*>, domain: ProtectionDomain, bytes: ByteArray
-    ): ByteArray? = null.also { load(classLoader) }
+    override fun transform(classLoader: ClassLoader?, className: String?,
+        redefined: Class<*>?, domain: ProtectionDomain?, bytes: ByteArray?
+    ): ByteArray? = null.also { classLoader?.let { load(it) } }
 
     fun register(inst: Instrumentation) {
         val result = runCatching { expose(jar) }
@@ -18,7 +18,7 @@ class Knot(private val jar: Path) : ClassFileTransformer {
         registry.add(inst)
     }
 
-    private fun delegate() = run {
+    private fun delegate(): Any = run {
         val base = Class.forName("$knot.KnotClassLoader")
         val delegate = base.getDeclaredField("delegate")
         val threads = Thread.getAllStackTraces().keys
@@ -27,7 +27,7 @@ class Knot(private val jar: Path) : ClassFileTransformer {
         delegate.apply { isAccessible = true }.get(knot)
     }
 
-    private fun expose(jar: Path) = delegate().let {
+    private fun expose(jar: Path): Unit = delegate().let {
         val base = Class.forName("$knot.KnotClassDelegate")
         val source = base.getMethod("addCodeSource", Path::class.java)
         source.apply { isAccessible = true }.invoke(it, jar)