KT-2752: add diagnostic that reports about applying JsName on overridden declarations

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/diagnostics/DefaultErrorMessagesJs.kt

@@ -42,6 +42,7 @@ private val DIAGNOSTIC_FACTORY_TO_RENDERER by lazy {
         put(ErrorsJs.JS_NAME_ON_PRIMARY_CONSTRUCTOR_PROHIBITED, "@JsName annotation is prohibited for primary constructors")
         put(ErrorsJs.JS_NAME_ON_ACCESSOR_AND_PROPERTY, "@JsName can be either on a property or its accessors, not both of them")
         put(ErrorsJs.JS_NAME_IS_NOT_ON_ALL_ACCESSORS, "@JsName should be on all of the property accessors")
+        put(ErrorsJs.JS_NAME_PROHIBITED_FOR_OVERRIDE, "@JsName is prohibited for overridden members")
 
         this
     }

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/diagnostics/ErrorsJs.java

@@ -49,6 +49,7 @@ public interface ErrorsJs {
     DiagnosticFactory0<KtElement> JS_NAME_ON_PRIMARY_CONSTRUCTOR_PROHIBITED = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory0<KtElement> JS_NAME_ON_ACCESSOR_AND_PROPERTY = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory0<PsiElement> JS_NAME_IS_NOT_ON_ALL_ACCESSORS = DiagnosticFactory0.create(ERROR);
+    DiagnosticFactory0<PsiElement> JS_NAME_PROHIBITED_FOR_OVERRIDE = DiagnosticFactory0.create(ERROR);
 
     @SuppressWarnings("UnusedDeclaration")
     Object _initializer = new Object() {

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/diagnostics/JsNameChecker.kt

@@ -16,10 +16,7 @@
 
 package org.jetbrains.kotlin.js.resolve.diagnostics
 
-import org.jetbrains.kotlin.descriptors.ConstructorDescriptor
-import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
-import org.jetbrains.kotlin.descriptors.PropertyAccessorDescriptor
-import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.diagnostics.DiagnosticSink
 import org.jetbrains.kotlin.js.translate.utils.AnnotationsUtils
 import org.jetbrains.kotlin.psi.KtDeclaration
@@ -39,6 +36,10 @@ object JsNameChecker : SimpleDeclarationChecker {
         if (AnnotationsUtils.getJsName(descriptor) == null) return
         val jsNamePsi = AnnotationsUtils.getJsNameAnnotationPsi(bindingContext, declaration, descriptor) ?: return
 
+        if (descriptor is CallableMemberDescriptor && descriptor.overriddenDescriptors.isNotEmpty()) {
+            diagnosticHolder.report(ErrorsJs.JS_NAME_PROHIBITED_FOR_OVERRIDE.on(jsNamePsi))
+        }
+
         when (descriptor) {
             is ConstructorDescriptor -> {
                 if (descriptor.isPrimary) {