[JS IR] Not export fun with stable name and default argument

if it is not exported, but just with stable name

^KT-50464 fixed

Merge-request: KT-MR-5324
Merged-by: Ilya Goncharov <Ilya.Goncharov@jetbrains.com>

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/ExportedDefaultParameterStub.kt

@@ -15,11 +15,11 @@ import org.jetbrains.kotlin.backend.common.lower.irBlockBody
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.backend.js.JsIrBackendContext
 import org.jetbrains.kotlin.ir.backend.js.JsLoweredDeclarationOrigin
+import org.jetbrains.kotlin.ir.backend.js.export.isExported
 import org.jetbrains.kotlin.ir.backend.js.ir.JsIrBuilder
 import org.jetbrains.kotlin.ir.backend.js.utils.JsAnnotations
 import org.jetbrains.kotlin.ir.backend.js.utils.hasStableJsName
 import org.jetbrains.kotlin.ir.builders.*
-import org.jetbrains.kotlin.ir.builders.declarations.addFunction
 import org.jetbrains.kotlin.ir.builders.declarations.buildFun
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
@@ -105,7 +105,9 @@ class ExportedDefaultParameterStub(val context: JsIrBackendContext) : Declaratio
             origin = JsIrBuilder.SYNTHESIZED_DECLARATION
         }
 
-        context.additionalExportedDeclarations.add(exportedDefaultStubFun)
+        if (declaration.isExported(context)) {
+            context.additionalExportedDeclarations.add(exportedDefaultStubFun)
+        }
 
         exportedDefaultStubFun.parent = declaration.parent
         exportedDefaultStubFun.copyParameterDeclarationsFrom(declaration)

js/js.translator/testData/typescript-export/selectiveExport/selectiveExport.kt

@@ -30,6 +30,9 @@ class Class
 
 external interface ExternalInterface
 
+@JsName("bbb")
+fun zzz(x: Int = 10) {}
+
 // FILE: file2.kt
 
 @file:JsExport