diff --git a/jslib/src/core/core.kt b/jslib/src/core/core.kt
index 0e3ceb4fe5c..1edf565e29d 100644
--- a/jslib/src/core/core.kt
+++ b/jslib/src/core/core.kt
@@ -6,6 +6,7 @@ import java.util.*;
 
 
 
+native
 val noImpl : Nothing = throw Exception();
 
 library("println")
diff --git a/jslib/src/core/json.kt b/jslib/src/core/json.kt
index a7a40190118..df624aad0be 100644
--- a/jslib/src/core/json.kt
+++ b/jslib/src/core/json.kt
@@ -3,15 +3,16 @@ package js
 import java.util.*;
 import js.library
 
+native
 class Json() {
 
 }
 
 library("jsonSet")
 fun Json.set(paramName : String, value : Any?) : Unit {}
+
 library("jsonGet")
 fun Json.get(paramName : String) : Any? = null
 
-fun <K, V> Map<K, V>.toJson() : Json = Json()
 library("jsonFromTuples")
 fun json(vararg pairs : Tuple2<String, Any?>) = Json()
diff --git a/translator/src/org/jetbrains/k2js/translate/declaration/NamespaceDeclarationTranslator.java b/translator/src/org/jetbrains/k2js/translate/declaration/NamespaceDeclarationTranslator.java
new file mode 100644
index 00000000000..b2197d9e76d
--- /dev/null
+++ b/translator/src/org/jetbrains/k2js/translate/declaration/NamespaceDeclarationTranslator.java
@@ -0,0 +1,32 @@
+package org.jetbrains.k2js.translate.declaration;
+
+import com.google.common.collect.Lists;
+import com.google.dart.compiler.backend.js.ast.JsStatement;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jet.lang.descriptors.NamespaceDescriptor;
+import org.jetbrains.jet.lang.psi.JetFile;
+import org.jetbrains.k2js.translate.context.TranslationContext;
+import org.jetbrains.k2js.translate.general.AbstractTranslator;
+import org.jetbrains.k2js.translate.general.Translation;
+
+import java.util.List;
+
+import static org.jetbrains.k2js.translate.utils.BindingUtils.getAllNonNativeNamespaceDescriptors;
+
+/**
+ * @author Pavel Talanov
+ */
+public final class NamespaceDeclarationTranslator extends AbstractTranslator {
+
+    public static List<JsStatement> translateFiles(@NotNull List<JetFile> files, @NotNull TranslationContext context) {
+        List<JsStatement> result = Lists.newArrayList();
+        for (NamespaceDescriptor namespaceDescriptor : getAllNonNativeNamespaceDescriptors(context.bindingContext(), files)) {
+            result.add(Translation.translateNamespace(namespaceDescriptor, context));
+        }
+        return result;
+    }
+
+    private NamespaceDeclarationTranslator(@NotNull TranslationContext context) {
+        super(context);
+    }
+}
diff --git a/translator/src/org/jetbrains/k2js/translate/general/Translation.java b/translator/src/org/jetbrains/k2js/translate/general/Translation.java
index d8b1cc3cbb3..1c70c401ee9 100644
--- a/translator/src/org/jetbrains/k2js/translate/general/Translation.java
+++ b/translator/src/org/jetbrains/k2js/translate/general/Translation.java
@@ -13,6 +13,7 @@ import org.jetbrains.jet.lang.types.JetStandardLibrary;
 import org.jetbrains.k2js.translate.context.StaticContext;
 import org.jetbrains.k2js.translate.context.TranslationContext;
 import org.jetbrains.k2js.translate.declaration.ClassTranslator;
+import org.jetbrains.k2js.translate.declaration.NamespaceDeclarationTranslator;
 import org.jetbrains.k2js.translate.declaration.NamespaceTranslator;
 import org.jetbrains.k2js.translate.expression.ExpressionVisitor;
 import org.jetbrains.k2js.translate.expression.FunctionTranslator;
@@ -43,6 +44,11 @@ public final class Translation {
         return NamespaceTranslator.translateNamespace(namespace, context);
     }
 
+    @NotNull
+    public static List<JsStatement> translateFiles(@NotNull List<JetFile> files, @NotNull TranslationContext context) {
+        return NamespaceDeclarationTranslator.translateFiles(files, context);
+    }
+
     @NotNull
     public static JsInvocation translateClassDeclaration(@NotNull JetClass classDeclaration,
                                                          @NotNull TranslationContext context) {
@@ -99,8 +105,7 @@ public final class Translation {
         StaticContext staticContext = StaticContext.generateStaticContext(standardLibrary, bindingContext);
         JsBlock block = staticContext.getProgram().getFragmentBlock(0);
         TranslationContext context = TranslationContext.rootContext(staticContext);
-        block.addStatement(Translation.translateNamespace(namespaceToTranslate, context));
-
+        block.getStatements().addAll(Translation.translateFiles(files, context));
         JsNamer namer = new JsPrettyNamer();
         namer.exec(context.program());
         return context.program();
diff --git a/translator/src/org/jetbrains/k2js/translate/utils/AnnotationsUtils.java b/translator/src/org/jetbrains/k2js/translate/utils/AnnotationsUtils.java
index 7ae74744834..dc34ae47913 100644
--- a/translator/src/org/jetbrains/k2js/translate/utils/AnnotationsUtils.java
+++ b/translator/src/org/jetbrains/k2js/translate/utils/AnnotationsUtils.java
@@ -70,13 +70,26 @@ public final class AnnotationsUtils {
     }
 
     public static boolean isNativeObject(@NotNull DeclarationDescriptor descriptor) {
-        if (getAnnotationByName(descriptor, NATIVE_ANNOTATION_FQNAME) != null) {
+        return hasAnnotationOrInsideAnnotatedClass(descriptor, NATIVE_ANNOTATION_FQNAME);
+    }
+
+    public static boolean isLibraryObject(@NotNull DeclarationDescriptor descriptor) {
+        return hasAnnotationOrInsideAnnotatedClass(descriptor, LIBRARY_ANNOTATION_FQNAME);
+    }
+
+    //TODO: the use of this method is splattered across the code which can be hard to track
+    public static boolean isPredefinedObject(@NotNull DeclarationDescriptor descriptor) {
+        return isLibraryObject(descriptor) || isNativeObject(descriptor);
+    }
+
+    private static boolean hasAnnotationOrInsideAnnotatedClass(DeclarationDescriptor descriptor, String annotationFQName) {
+        if (getAnnotationByName(descriptor, annotationFQName) != null) {
             return true;
         }
         ClassDescriptor containingClass = getContainingClass(descriptor);
         if (containingClass == null) {
             return false;
         }
-        return (getAnnotationByName(containingClass, NATIVE_ANNOTATION_FQNAME) != null);
+        return (getAnnotationByName(containingClass, annotationFQName) != null);
     }
 }
diff --git a/translator/src/org/jetbrains/k2js/translate/utils/BindingUtils.java b/translator/src/org/jetbrains/k2js/translate/utils/BindingUtils.java
index 21e57fa974c..2533826375a 100644
--- a/translator/src/org/jetbrains/k2js/translate/utils/BindingUtils.java
+++ b/translator/src/org/jetbrains/k2js/translate/utils/BindingUtils.java
@@ -1,5 +1,6 @@
 package org.jetbrains.k2js.translate.utils;
 
+import com.google.common.collect.Sets;
 import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -13,6 +14,7 @@ import org.jetbrains.jet.lang.types.JetType;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 
 import static org.jetbrains.k2js.translate.utils.DescriptorUtils.*;
 
@@ -85,6 +87,9 @@ public final class BindingUtils {
                                                                    @NotNull NamespaceDescriptor namespace) {
         List<JetDeclaration> declarations = new ArrayList<JetDeclaration>();
         for (DeclarationDescriptor descriptor : namespace.getMemberScope().getAllDescriptors()) {
+            if (AnnotationsUtils.isPredefinedObject(descriptor)) {
+                continue;
+            }
             //TODO:
             if (descriptor instanceof NamespaceDescriptor) {
                 continue;
@@ -296,4 +301,17 @@ public final class BindingUtils {
         assert propertyDescriptor != null;
         return propertyDescriptor;
     }
+
+    @NotNull
+    public static Set<NamespaceDescriptor> getAllNonNativeNamespaceDescriptors(@NotNull BindingContext context,
+                                                                               @NotNull List<JetFile> files) {
+        Set<NamespaceDescriptor> descriptorSet = Sets.newHashSet();
+        for (JetFile file : files) {
+            NamespaceDescriptor namespaceDescriptor = getNamespaceDescriptor(context, file);
+            if (!AnnotationsUtils.isPredefinedObject(namespaceDescriptor)) {
+                descriptorSet.add(namespaceDescriptor);
+            }
+        }
+        return descriptorSet;
+    }
 }
diff --git a/translator/src/org/jetbrains/k2js/translate/utils/DescriptorUtils.java b/translator/src/org/jetbrains/k2js/translate/utils/DescriptorUtils.java
index 2e2d2184cd8..75c3efc6239 100644
--- a/translator/src/org/jetbrains/k2js/translate/utils/DescriptorUtils.java
+++ b/translator/src/org/jetbrains/k2js/translate/utils/DescriptorUtils.java
@@ -192,6 +192,9 @@ public final class DescriptorUtils {
     public static List<ClassDescriptor> getAllClassesDefinedInNamespace(@NotNull NamespaceDescriptor namespaceDescriptor) {
         List<ClassDescriptor> classDescriptors = Lists.newArrayList();
         for (DeclarationDescriptor descriptor : namespaceDescriptor.getMemberScope().getAllDescriptors()) {
+            if (AnnotationsUtils.isPredefinedObject(descriptor)) {
+                continue;
+            }
             if (descriptor instanceof ClassDescriptor) {
                 classDescriptors.add((ClassDescriptor) descriptor);
             }