[JS IR] Possibility to use export for nested inside object

[JS IR] Fix test data after master rebase

[JS IR] Use stdlib's listOfNotNull

[JS IR] Possibility to use export for nested inside object

- Add tests for such cases

Merge-request: KT-MR-4883

^KT-49363 fixed

js/js.translator/testData/box/export/exportNestedClass.kt

@@ -24,7 +24,25 @@ class B {
     }
 }
 
+@JsExport
+object MyObject {
+    class A {
+        fun valueA() = "OK"
+    }
+    class B {
+        fun valueB() = "OK"
+    }
+    class C {
+        fun valueC() = "OK"
+    }
+}
+
 // FILE: test.js
 function box() {
-    return new this["export_nested_class"].B.Foo().bar("K");
+    if (new this["export_nested_class"].B.Foo().bar("K") != "OK") return "fail 1";
+    if (new this["export_nested_class"].MyObject.A().valueA() != "OK") return "fail 2";
+    if (new this["export_nested_class"].MyObject.B().valueB() != "OK") return "fail 3";
+    if (new this["export_nested_class"].MyObject.C().valueC() != "OK") return "fail 4";
+
+    return "OK"
 }

js/js.translator/testData/box/export/exportNestedObject.kt

@@ -37,6 +37,19 @@ sealed class MyEnum(val name: String) {
     object C: MyEnum("C")
 }
 
+@JsExport
+object MyObject {
+    object A {
+        fun valueA() = "OK"
+    }
+    object B {
+        fun valueB() = "OK"
+    }
+    object C {
+        fun valueC() = "OK"
+    }
+}
+
 // FILE: test.js
 
 function box() {
@@ -54,5 +67,9 @@ function box() {
     if (nestedObjectExport.MyEnum.B.name != 'B') return 'MyEnum.B failure';
     if (nestedObjectExport.MyEnum.C.name != 'C') return 'MyEnum.C failure';
 
+    if (nestedObjectExport.MyObject.A.valueA() != "OK") return 'MyObject.A failure';
+    if (nestedObjectExport.MyObject.B.valueB() != "OK") return 'MyObject.B failure';
+    if (nestedObjectExport.MyObject.C.valueC() != "OK") return 'MyObject.C failure';
+
     return 'OK';
 }