diff --git a/core/descriptors/src/org/jetbrains/jet/lang/resolve/DescriptorUtils.java b/core/descriptors/src/org/jetbrains/jet/lang/resolve/DescriptorUtils.java
index 5e276544ae6..5dc21e35a03 100644
--- a/core/descriptors/src/org/jetbrains/jet/lang/resolve/DescriptorUtils.java
+++ b/core/descriptors/src/org/jetbrains/jet/lang/resolve/DescriptorUtils.java
@@ -129,6 +129,14 @@ public class DescriptorUtils {
         return descriptor.getContainingDeclaration() instanceof PackageFragmentDescriptor;
     }
 
+    public static boolean isExtension(@NotNull CallableDescriptor descriptor) {
+        return (descriptor.getExtensionReceiverParameter() != null);
+    }
+
+    public static boolean isOverride(@NotNull CallableMemberDescriptor descriptor) {
+        return !descriptor.getOverriddenDescriptors().isEmpty();
+    }
+
     /**
      * @return true iff this is a top-level declaration or a class member with no expected "this" object (e.g. static members in Java,
      * values() and valueOf() methods of enum classes, etc.)
@@ -185,6 +193,18 @@ public class DescriptorUtils {
         return module;
     }
 
+    @Nullable
+    public static ClassDescriptor getContainingClass(@NotNull DeclarationDescriptor descriptor) {
+        DeclarationDescriptor containing = descriptor.getContainingDeclaration();
+        while (containing != null) {
+            if (containing instanceof ClassDescriptor && !isClassObject(containing)) {
+                return (ClassDescriptor) containing;
+            }
+            containing = containing.getContainingDeclaration();
+        }
+        return null;
+    }
+
     public static boolean isAncestor(
             @Nullable DeclarationDescriptor ancestor,
             @NotNull DeclarationDescriptor declarationDescriptor,
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/context/StaticContext.java b/js/js.translator/src/org/jetbrains/k2js/translate/context/StaticContext.java
index 16ab9e587e3..2a06ba4f38d 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/context/StaticContext.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/context/StaticContext.java
@@ -39,6 +39,7 @@ import org.jetbrains.k2js.translate.utils.JsAstUtils;
 import java.util.Map;
 
 import static org.jetbrains.jet.lang.resolve.DescriptorToSourceUtils.descriptorToDeclaration;
+import static org.jetbrains.jet.lang.resolve.DescriptorUtils.isExtension;
 import static org.jetbrains.k2js.config.LibrarySourcesConfig.BUILTINS_JS_MODULE_NAME;
 import static org.jetbrains.k2js.translate.utils.AnnotationsUtils.*;
 import static org.jetbrains.k2js.translate.utils.JsDescriptorUtils.*;
@@ -220,6 +221,7 @@ public final class StaticContext {
         return result;
     }
 
+    @NotNull
     public Config getConfig() {
         return config;
     }
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/declaration/DelegationTranslator.kt b/js/js.translator/src/org/jetbrains/k2js/translate/declaration/DelegationTranslator.kt
index 664a1e58cfc..a0c8401f753 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/declaration/DelegationTranslator.kt
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/declaration/DelegationTranslator.kt
@@ -115,7 +115,7 @@ public class DelegationTranslator(
             val delegateRefName = context().getScopeForDescriptor(getterDescriptor).declareName(delegateName)
             val delegateRef = JsNameRef(delegateRefName, JsLiteral.THIS)
 
-            val returnExpression = if (JsDescriptorUtils.isExtension(descriptor)) {
+            val returnExpression = if (DescriptorUtils.isExtension(descriptor)) {
                 val getterName = context().getNameForDescriptor(getterDescriptor)
                 val receiver = Namer.getReceiverParameterName()
                 JsInvocation(JsNameRef(getterName, delegateRef), JsNameRef(receiver))
@@ -125,7 +125,7 @@ public class DelegationTranslator(
             }
 
             val jsFunction = simpleReturnFunction(context().getScopeForDescriptor(getterDescriptor.getContainingDeclaration()), returnExpression)
-            if (JsDescriptorUtils.isExtension(descriptor)) {
+            if (DescriptorUtils.isExtension(descriptor)) {
                 val receiverName = jsFunction.getScope().declareName(Namer.getReceiverParameterName())
                 jsFunction.getParameters().add(JsParameter(receiverName))
             }
@@ -143,7 +143,7 @@ public class DelegationTranslator(
             val delegateRefName = context().getScopeForDescriptor(setterDescriptor).declareName(delegateName)
             val delegateRef = JsNameRef(delegateRefName, JsLiteral.THIS)
 
-            val setExpression = if (JsDescriptorUtils.isExtension(descriptor)) {
+            val setExpression = if (DescriptorUtils.isExtension(descriptor)) {
                 val setterName = context().getNameForDescriptor(setterDescriptor)
                 val setterNameRef = JsNameRef(setterName, delegateRef)
                 val extensionFunctionReceiverName = jsFunction.getScope().declareName(Namer.getReceiverParameterName())
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/declaration/PropertyTranslator.kt b/js/js.translator/src/org/jetbrains/k2js/translate/declaration/PropertyTranslator.kt
index d0388fb15fe..ea1bd36e8a8 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/declaration/PropertyTranslator.kt
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/declaration/PropertyTranslator.kt
@@ -31,7 +31,7 @@ import org.jetbrains.k2js.translate.utils.JsDescriptorUtils
 import org.jetbrains.k2js.translate.context.Namer.*
 import org.jetbrains.k2js.translate.utils.ast.*
 import org.jetbrains.k2js.translate.utils.TranslationUtils.*
-import org.jetbrains.k2js.translate.utils.JsDescriptorUtils.isExtension
+import org.jetbrains.jet.lang.resolve.DescriptorUtils.isExtension
 import org.jetbrains.jet.lang.resolve.calls.model.ResolvedCall
 
 /**
@@ -64,7 +64,7 @@ public fun MutableList<JsPropertyInitializer>.addGetterAndSetter(
         generateSetter: () -> JsPropertyInitializer
 ) {
     val to: MutableList<JsPropertyInitializer>
-    if (!JsDescriptorUtils.isExtension(descriptor)) {
+    if (!isExtension(descriptor)) {
         to = SmartList<JsPropertyInitializer>()
         this.add(JsPropertyInitializer(context.getNameForDescriptor(descriptor).makeRef(), JsObjectLiteral(to, true)))
     }
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/expression/FunctionTranslator.java b/js/js.translator/src/org/jetbrains/k2js/translate/expression/FunctionTranslator.java
index d757a56e6f8..52e0ff3a84b 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/expression/FunctionTranslator.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/expression/FunctionTranslator.java
@@ -17,7 +17,10 @@
 package org.jetbrains.k2js.translate.expression;
 
 
-import com.google.dart.compiler.backend.js.ast.*;
+import com.google.dart.compiler.backend.js.ast.JsFunction;
+import com.google.dart.compiler.backend.js.ast.JsName;
+import com.google.dart.compiler.backend.js.ast.JsParameter;
+import com.google.dart.compiler.backend.js.ast.JsPropertyInitializer;
 import com.google.dart.compiler.backend.js.ast.metadata.MetadataPackage;
 import com.intellij.util.SmartList;
 import org.jetbrains.annotations.NotNull;
@@ -28,11 +31,11 @@ import org.jetbrains.jet.lang.descriptors.Modality;
 import org.jetbrains.jet.lang.descriptors.ValueParameterDescriptor;
 import org.jetbrains.jet.lang.psi.JetDeclarationWithBody;
 import org.jetbrains.jet.lang.psi.JetFunctionLiteralExpression;
+import org.jetbrains.jet.lang.resolve.DescriptorUtils;
 import org.jetbrains.k2js.translate.context.AliasingContext;
 import org.jetbrains.k2js.translate.context.Namer;
 import org.jetbrains.k2js.translate.context.TranslationContext;
 import org.jetbrains.k2js.translate.general.AbstractTranslator;
-import org.jetbrains.k2js.translate.utils.JsDescriptorUtils;
 import org.jetbrains.k2js.translate.utils.TranslationUtils;
 
 import java.util.Collections;
@@ -142,6 +145,6 @@ public final class FunctionTranslator extends AbstractTranslator {
     }
 
     private boolean isExtensionFunction() {
-        return JsDescriptorUtils.isExtension(descriptor) && !(functionDeclaration instanceof JetFunctionLiteralExpression);
+        return DescriptorUtils.isExtension(descriptor) && !(functionDeclaration instanceof JetFunctionLiteralExpression);
     }
 }
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/reference/CallableReferenceTranslator.kt b/js/js.translator/src/org/jetbrains/k2js/translate/reference/CallableReferenceTranslator.kt
index 34a82bc855c..38d89c46a21 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/reference/CallableReferenceTranslator.kt
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/reference/CallableReferenceTranslator.kt
@@ -83,7 +83,7 @@ object CallableReferenceTranslator {
 
     private fun isConstructor(descriptor: CallableDescriptor): Boolean = descriptor is ConstructorDescriptor
 
-    private fun isExtension(descriptor: CallableDescriptor): Boolean = JsDescriptorUtils.isExtension(descriptor)
+    private fun isExtension(descriptor: CallableDescriptor): Boolean = DescriptorUtils.isExtension(descriptor)
 
     private fun isMember(descriptor: CallableDescriptor): Boolean = JsDescriptorUtils.getContainingDeclaration(descriptor) is ClassDescriptor
 
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/test/JSTestGenerator.java b/js/js.translator/src/org/jetbrains/k2js/translate/test/JSTestGenerator.java
index 70f2efb0e74..3518051a57e 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/test/JSTestGenerator.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/test/JSTestGenerator.java
@@ -23,11 +23,11 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jet.lang.descriptors.ClassDescriptor;
 import org.jetbrains.jet.lang.descriptors.FunctionDescriptor;
 import org.jetbrains.jet.lang.psi.JetFile;
+import org.jetbrains.jet.lang.resolve.DescriptorUtils;
 import org.jetbrains.k2js.translate.callTranslator.CallTranslator;
 import org.jetbrains.k2js.translate.context.TranslationContext;
 import org.jetbrains.k2js.translate.general.JetTestFunctionDetector;
 import org.jetbrains.k2js.translate.reference.ReferenceTranslator;
-import org.jetbrains.k2js.translate.utils.JsDescriptorUtils;
 
 import java.util.Collection;
 import java.util.Collections;
@@ -47,7 +47,7 @@ public final class JSTestGenerator {
     private static void doGenerateTestCalls(@NotNull List<FunctionDescriptor> functionDescriptors,
             @NotNull TranslationContext context, @NotNull JSTester jsTester) {
         for (FunctionDescriptor functionDescriptor : functionDescriptors) {
-            ClassDescriptor classDescriptor = JsDescriptorUtils.getContainingClass(functionDescriptor);
+            ClassDescriptor classDescriptor = DescriptorUtils.getContainingClass(functionDescriptor);
             if (classDescriptor == null) {
                 return;
             }
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/utils/AnnotationsUtils.java b/js/js.translator/src/org/jetbrains/k2js/translate/utils/AnnotationsUtils.java
index de5971b3160..ec82d640b16 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/utils/AnnotationsUtils.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/utils/AnnotationsUtils.java
@@ -32,9 +32,6 @@ import org.jetbrains.k2js.PredefinedAnnotation;
 import java.util.List;
 import java.util.Set;
 
-import static org.jetbrains.k2js.translate.utils.JsDescriptorUtils.getContainingClass;
-import static org.jetbrains.k2js.translate.utils.JsDescriptorUtils.isOverride;
-
 public final class AnnotationsUtils {
 
     private AnnotationsUtils() {
@@ -49,7 +46,7 @@ public final class AnnotationsUtils {
 
     @Nullable
     private static String getAnnotationStringParameter(@NotNull DeclarationDescriptor declarationDescriptor,
-                                                       @NotNull PredefinedAnnotation annotation) {
+            @NotNull PredefinedAnnotation annotation) {
         AnnotationDescriptor annotationDescriptor = getAnnotationByName(declarationDescriptor, annotation);
         assert annotationDescriptor != null;
         //TODO: this is a quick fix for unsupported default args problem
@@ -68,7 +65,7 @@ public final class AnnotationsUtils {
 
     @Nullable
     public static String getNameForAnnotatedObject(@NotNull DeclarationDescriptor declarationDescriptor,
-                                                   @NotNull PredefinedAnnotation annotation) {
+            @NotNull PredefinedAnnotation annotation) {
         if (!hasAnnotation(declarationDescriptor, annotation)) {
             return null;
         }
@@ -80,7 +77,7 @@ public final class AnnotationsUtils {
         List<DeclarationDescriptor> descriptors;
 
         if (declarationDescriptor instanceof CallableMemberDescriptor &&
-            isOverride((CallableMemberDescriptor) declarationDescriptor)) {
+            DescriptorUtils.isOverride((CallableMemberDescriptor) declarationDescriptor)) {
 
             Set<CallableMemberDescriptor> overriddenDeclarations =
                     DescriptorUtils.getAllOverriddenDeclarations((CallableMemberDescriptor) declarationDescriptor);
@@ -88,7 +85,7 @@ public final class AnnotationsUtils {
             descriptors = ContainerUtil.mapNotNull(overriddenDeclarations, new Function<CallableMemberDescriptor, DeclarationDescriptor>() {
                 @Override
                 public DeclarationDescriptor fun(CallableMemberDescriptor descriptor) {
-                    return isOverride(descriptor) ? null : descriptor;
+                    return DescriptorUtils.isOverride(descriptor) ? null : descriptor;
                 }
             });
         }
@@ -145,7 +142,7 @@ public final class AnnotationsUtils {
         if (getAnnotationByName(descriptor, fqn) != null) {
             return true;
         }
-        ClassDescriptor containingClass = getContainingClass(descriptor);
+        ClassDescriptor containingClass = DescriptorUtils.getContainingClass(descriptor);
         return containingClass != null && hasAnnotationOrInsideAnnotatedClass(containingClass, fqn);
     }
 }
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/utils/JsDescriptorUtils.java b/js/js.translator/src/org/jetbrains/k2js/translate/utils/JsDescriptorUtils.java
index cf0e0f4d4e6..79f16c9fcc4 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/utils/JsDescriptorUtils.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/utils/JsDescriptorUtils.java
@@ -96,14 +96,6 @@ public final class JsDescriptorUtils {
         return containing;
     }
 
-    public static boolean isExtension(@NotNull CallableDescriptor descriptor) {
-        return (descriptor.getExtensionReceiverParameter() != null);
-    }
-
-    public static boolean isOverride(@NotNull CallableMemberDescriptor descriptor) {
-        return !descriptor.getOverriddenDescriptors().isEmpty();
-    }
-
     @NotNull
     public static ReceiverParameterDescriptor getReceiverParameterForReceiver(@NotNull ReceiverValue receiverParameter) {
         DeclarationDescriptor declarationDescriptor = getDeclarationDescriptorForReceiver(receiverParameter);
@@ -135,19 +127,6 @@ public final class JsDescriptorUtils {
                                                 ", declarationDescriptor = " + declarationDescriptor);
     }
 
-    //TODO: maybe we have similar routine
-    @Nullable
-    public static ClassDescriptor getContainingClass(@NotNull DeclarationDescriptor descriptor) {
-        DeclarationDescriptor containing = descriptor.getContainingDeclaration();
-        while (containing != null) {
-            if (containing instanceof ClassDescriptor && !isClassObject(containing)) {
-                return (ClassDescriptor) containing;
-            }
-            containing = containing.getContainingDeclaration();
-        }
-        return null;
-    }
-
     @Nullable
     public static FunctionDescriptor getOverriddenDescriptor(@NotNull FunctionDescriptor functionDescriptor) {
         Set<? extends FunctionDescriptor> overriddenDescriptors = functionDescriptor.getOverriddenDescriptors();
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/utils/ManglingUtils.java b/js/js.translator/src/org/jetbrains/k2js/translate/utils/ManglingUtils.java
index 8824935d411..b1b6c27791f 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/utils/ManglingUtils.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/utils/ManglingUtils.java
@@ -48,7 +48,7 @@ public class ManglingUtils {
         String suggestedName = descriptor.getName().asString();
 
         if (descriptor instanceof FunctionDescriptor ||
-            descriptor instanceof PropertyDescriptor && JsDescriptorUtils.isExtension((PropertyDescriptor) descriptor)
+            descriptor instanceof PropertyDescriptor && DescriptorUtils.isExtension((PropertyDescriptor) descriptor)
         ) {
             suggestedName = getMangledName((CallableMemberDescriptor) descriptor);
         }
@@ -69,7 +69,7 @@ public class ManglingUtils {
     private static boolean needsStableMangling(CallableMemberDescriptor descriptor) {
         // Use stable mangling for overrides because we use stable mangling when any function inside a overridable declaration
         // for avoid clashing names when inheritance.
-        if (JsDescriptorUtils.isOverride(descriptor)) {
+        if (DescriptorUtils.isOverride(descriptor)) {
             return true;
         }
 
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/utils/TranslationUtils.java b/js/js.translator/src/org/jetbrains/k2js/translate/utils/TranslationUtils.java
index 222e6b4b516..1e7ce95216b 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/utils/TranslationUtils.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/utils/TranslationUtils.java
@@ -24,6 +24,7 @@ import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.descriptors.*;
 import org.jetbrains.jet.lang.descriptors.impl.AnonymousFunctionDescriptor;
 import org.jetbrains.jet.lang.psi.*;
+import org.jetbrains.jet.lang.resolve.DescriptorUtils;
 import org.jetbrains.jet.lang.types.JetType;
 import org.jetbrains.jet.lang.types.TypeProjection;
 import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
@@ -53,7 +54,7 @@ public final class TranslationUtils {
     public static JsPropertyInitializer translateFunctionAsEcma5PropertyDescriptor(@NotNull JsFunction function,
             @NotNull FunctionDescriptor descriptor,
             @NotNull TranslationContext context) {
-        if (JsDescriptorUtils.isExtension(descriptor)) {
+        if (DescriptorUtils.isExtension(descriptor)) {
             return translateExtensionFunctionAsEcma5DataDescriptor(function, descriptor, context);
         }
         else {
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/utils/utils.kt b/js/js.translator/src/org/jetbrains/k2js/translate/utils/utils.kt
index 570ad86cfb6..9c346e61ac8 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/utils/utils.kt
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/utils/utils.kt
@@ -26,6 +26,7 @@ import org.jetbrains.jet.lang.descriptors.FunctionDescriptor
 import org.jetbrains.k2js.translate.context.Namer
 import org.jetbrains.k2js.translate.context.TranslationContext
 import org.jetbrains.k2js.translate.utils.TranslationUtils.simpleReturnFunction
+import org.jetbrains.jet.lang.resolve.DescriptorUtils
 
 public val <T> ID: (T) -> T = { it }
 
@@ -43,7 +44,7 @@ public fun generateDelegateCall(
     val args = SmartList<JsExpression>()
     val functionScope = context.getScopeForDescriptor(fromDescriptor);
 
-    if (JsDescriptorUtils.isExtension(fromDescriptor)) {
+    if (DescriptorUtils.isExtension(fromDescriptor)) {
         val extensionFunctionReceiverName = functionScope.declareName(Namer.getReceiverParameterName())
         parameters.add(JsParameter(extensionFunctionReceiverName))
         args.add(JsNameRef(extensionFunctionReceiverName))