KT-13825: write simple name of class to constructor.$metadata$.simpleName.

js/js.translator/testData/box/reflection/light/jsClassSimpleName.kt

@@ -0,0 +1,46 @@
+package foo
+
+class undefined
+
+class Outer {
+    class Nested
+
+    inner class Inner
+}
+
+fun testWithInstance() {
+    assertEquals("A", A().jsClass.simpleName)
+    assertEquals("B", B().jsClass.simpleName)
+    assertEquals("O", O.jsClass.simpleName)
+    assertEquals("E", E.X.jsClass.simpleName)
+    assertEquals("Y", E.Y.jsClass.simpleName)
+// TODO uncomment after KT-13338 is fixed
+//    assertEquals("E", E.Z.jsClass.name)
+    assertEquals("undefined", undefined().jsClass.simpleName)
+    assertEquals("Nested", Outer.Nested().jsClass.simpleName)
+    assertEquals("Inner", Outer().Inner().jsClass.simpleName)
+}
+
+fun testWithClassReference() {
+    assertEquals("A", jsClass<A>().simpleName)
+    assertEquals("B", jsClass<B>().simpleName)
+    assertEquals("O", jsClass<O>().simpleName)
+    assertEquals("I", jsClass<I>().simpleName)
+    assertEquals("E", jsClass<E>().simpleName)
+    assertEquals("undefined", jsClass<undefined>().simpleName)
+    assertEquals("Nested", jsClass<Outer.Nested>().simpleName)
+    assertEquals("Inner", jsClass<Outer.Inner>().simpleName)
+}
+
+val JsClass<*>.simpleName: String
+    get() {
+        val dynClass: dynamic = this
+        return dynClass.`$metadata$`.simpleName as? String ?: ""
+    }
+
+fun box(): String {
+    testWithInstance()
+    testWithClassReference()
+
+    return "OK"
+}