JS: fix translation of references to external nested classes in files marked with @JsModule. See KT-15797

js/js.translator/src/org/jetbrains/kotlin/js/translate/context/StaticContext.java

@@ -279,7 +279,7 @@ public final class StaticContext {
             expression = getQualifiedExpression(suggested.getScope());
         }
 
-        if (isNativeObject(suggested.getDescriptor())) {
+        if (isNativeObject(suggested.getDescriptor()) && DescriptorUtils.isTopLevelDeclaration(suggested.getDescriptor())) {
             String fileModuleName = AnnotationsUtils.getFileModuleName(getBindingContext(), suggested.getDescriptor());
             if (fileModuleName != null) {
                 JsName moduleJsName = getImportedModule(fileModuleName, null).internalName;

js/js.translator/testData/box/jsModule/externalPackage.js

@@ -6,6 +6,11 @@ define("lib", [], function() {
         return this.x + y;
     };
 
+    function Nested() {
+        this.y = 55;
+    }
+    A.Nested = Nested;
+
     B = {
         x: 123,
         foo: function(y) {

js/js.translator/testData/box/jsModule/externalPackage.kt

@@ -2,10 +2,14 @@
 @file:JsModule("lib")
 package foo
 
-external class A(@native x: Int = noImpl) {
+external class A(x: Int) {
     val x: Int
 
     fun foo(y: Int): Int = noImpl
+
+    class Nested {
+        val y: Int
+    }
 }
 
 external object B {
@@ -25,6 +29,9 @@ fun box(): String {
     assertEquals(23, a.x)
     assertEquals(65, a.foo(42))
 
+    val nested = A.Nested()
+    assertEquals(55, nested.y)
+
     assertEquals(123, B.x)
     assertEquals(265, B.foo(142))
 

js/js.translator/testData/box/jsModule/externalPackagePlain.js

@@ -6,6 +6,11 @@ var lib = function() {
         return this.x + y;
     };
 
+    function Nested() {
+        this.y = 55;
+    }
+    A.Nested = Nested;
+
     B = {
         x: 123,
         foo: function(y) {

js/js.translator/testData/box/jsModule/externalPackagePlain.kt

@@ -6,6 +6,10 @@ external class A(x: Int = noImpl) {
     val x: Int
 
     fun foo(y: Int): Int = noImpl
+
+    class Nested {
+        val y: Int
+    }
 }
 
 external object B {
@@ -25,6 +29,9 @@ fun box(): String {
     assertEquals(23, a.x)
     assertEquals(65, a.foo(42))
 
+    val nested = A.Nested()
+    assertEquals(55, nested.y)
+
     assertEquals(123, B.x)
     assertEquals(265, B.foo(142))