[K/JS, K/Wasm] Generate star imports for external objects with the @JsModule annotation for ES modules

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/lower/ComplexExternalDeclarationsToTopLevelFunctionsLowering.kt

@@ -366,22 +366,21 @@ class ComplexExternalDeclarationsToTopLevelFunctionsLowering(val context: WasmBa
     }
 
     private fun referenceTopLevelExternalDeclaration(declaration: IrDeclarationWithName): String {
-        var name = declaration.getJsNameOrKotlinName().identifier
+        var name: String? = declaration.getJsNameOrKotlinName().identifier
 
         val qualifier = currentFile.getJsQualifier()
 
         val module = currentFile.getJsModule()
             ?: declaration.getJsModule()?.also {
-                // JsModule on top level declarations imports "default"
-                name = "default"
+                name = if (declaration is IrClass && declaration.isObject) null else "default"
             }
 
         if (qualifier == null && module == null)
-            return name
+            return name!!
 
         val qualifieReference = JsModuleAndQualifierReference(module, qualifier)
         context.jsModuleAndQualifierReferences += qualifieReference
-        return qualifieReference.jsVariableName + "." + name
+        return qualifieReference.jsVariableName + name?.let { ".$it" }.orEmpty()
     }
 }