add js delegate

used by private val logger by KotlinLogging.logger()

Author: oshai

src/jsMain/kotlin/io/github/oshai/KotlinLogging.kt

@@ -0,0 +1,29 @@
+package io.github.oshai
+
+import kotlin.properties.ReadOnlyProperty
+import kotlin.reflect.KProperty
+
+/**
+ * The JS way to define a logger without explicit name
+ * ```
+ * class MyClass {
+ *     private val logger by KotlinLogging.logger()
+ * }
+ * ```
+ */
+public fun KotlinLogging.logger(): ReadOnlyProperty<Any?, KLogger> = LoggerDelegate()
+
+private class LoggerDelegate : ReadOnlyProperty<Any?, KLogger> {
+  private lateinit var logger: KLogger
+
+  override fun getValue(thisRef: Any?, property: KProperty<*>): KLogger {
+    if (!::logger.isInitialized) {
+      logger =
+        thisRef.asDynamic()?.constructor?.name.unsafeCast<String?>()?.let {
+          KotlinLogging.logger(it)
+        }
+          ?: KotlinLogging.logger("root-logger")
+    }
+    return logger
+  }
+}

src/jsTest/kotlin/io/github/oshai/SimpleJsTest.kt

@@ -18,6 +18,11 @@ class SimpleJsTest {
     KotlinLoggingConfiguration.APPENDER = ConsoleOutputAppender
   }
 
+  @Test
+  fun loggerNameTest() {
+    assertEquals("MyClass", MyClass().logger2.name)
+  }
+
   private fun createAppender(): SimpleAppender = SimpleAppender()
 
   class SimpleAppender : Appender {
@@ -50,3 +55,7 @@ class SimpleJsTest {
     }
   }
 }
+
+class MyClass {
+  val logger2 by KotlinLogging.logger()
+}