diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestSupport.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestBase.java
similarity index 50%
rename from js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestSupport.java
rename to js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestBase.java
index 1381212893f..4fef9e739f3 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestSupport.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestBase.java
@@ -17,29 +17,25 @@
  */
 package org.jetbrains.k2js.test.semantics;
 
-import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
-import com.google.common.collect.Sets;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.jet.cli.common.ExitCode;
-import org.jetbrains.jet.cli.js.K2JSCompiler;
-import org.jetbrains.jet.cli.js.K2JSCompilerArguments;
 import org.jetbrains.k2js.config.Config;
 import org.jetbrains.k2js.config.EcmaVersion;
+import org.jetbrains.k2js.facade.MainCallParameters;
 import org.jetbrains.k2js.test.SingleFileTranslationTest;
+import org.jetbrains.k2js.test.utils.TranslationUtils;
 
 import java.io.File;
 import java.util.EnumSet;
 import java.util.List;
-import java.util.Set;
 
-abstract class StdLibTestSupport extends SingleFileTranslationTest {
+abstract class StdLibTestBase extends SingleFileTranslationTest {
 
-    protected StdLibTestSupport() {
+    protected StdLibTestBase() {
         super("stdlib/");
     }
 
-    protected void generateJavaScriptFiles(@NotNull EnumSet<EcmaVersion> ecmaVersions,
+    protected void performStdLibTest(@NotNull EnumSet<EcmaVersion> ecmaVersions,
             @NotNull String sourceDir, @NotNull String... stdLibFiles) throws Exception {
         List<String> files = Lists.newArrayList();
 
@@ -49,41 +45,22 @@ abstract class StdLibTestSupport extends SingleFileTranslationTest {
             files.add(new File(stdlibDir, file).getPath());
         }
 
-        Set<String> ignoreFiles = Sets.newHashSet(
-                "/jquery/common.kt",
-                "/jquery/ui.kt",
-                "/dom/domcore.kt",
-                "/dom/html/htmlcore.kt",
-                "/dom/html5/canvas.kt",
-                "/dom/html/window.kt");
 
         // lets add the standard JS library files
-        Iterable<String> names = Iterables.concat(Config.LIB_FILE_NAMES, Config.LIB_FILE_NAMES_DEPENDENT_ON_STDLIB);
+        Iterable<String> names = Config.LIB_FILE_NAMES_DEPENDENT_ON_STDLIB;
         for (String libFileName : names) {
-            if (!ignoreFiles.contains(libFileName)) {
-                System.out.println("Compiling " + libFileName);
-                files.add(Config.LIBRARIES_LOCATION + libFileName);
-            }
+            System.out.println("Compiling " + libFileName);
+            files.add(Config.LIBRARIES_LOCATION + libFileName);
         }
 
         // lets add the standard Kotlin library files
         for (String libFileName : Config.STDLIB_FILE_NAMES) {
-            if (!ignoreFiles.contains(libFileName)) {
-                System.out.println("Compiling " + libFileName);
-                files.add(Config.STDLIB_LOCATION + libFileName);
-            }
+            System.out.println("Compiling " + libFileName);
+            files.add(Config.STDLIB_LOCATION + libFileName);
         }
-
-        // now lets try invoke the compiler
         for (EcmaVersion version : ecmaVersions) {
-            K2JSCompiler compiler = new K2JSCompiler();
-            K2JSCompilerArguments arguments = new K2JSCompilerArguments();
-            arguments.outputFile = getOutputFilePath(getTestName(false) + ".compiler.kt", version);
-            arguments.sourceFiles = files.toArray(new String[files.size()]);
-            arguments.verbose = true;
-            System.out.println("Compiling with version: " + version + " to: " + arguments.outputFile);
-            ExitCode answer = compiler.exec(System.out, arguments);
-            assertEquals("Compile failed", ExitCode.OK, answer);
+            String outputFilePath = getOutputFilePath(getTestName(false) + ".compiler.kt", version);
+            TranslationUtils.translateFiles(getProject(), files, outputFilePath, MainCallParameters.noCall(), version);
         }
     }
 }
diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestToJSTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestToJSTest.java
index 8b86362b056..969457c95b6 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestToJSTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestToJSTest.java
@@ -20,13 +20,13 @@ import org.jetbrains.k2js.config.EcmaVersion;
 
 /**
  */
-public class StdLibTestToJSTest extends StdLibTestSupport {
+public class StdLibTestToJSTest extends StdLibTestBase {
     public void testGenerateTestCase() throws Exception {
-        generateJavaScriptFiles(EcmaVersion.all(),
-                                "libraries/stdlib/test",
-                                //"dom/DomTest.kt",
-                                "js/MapTest.kt",
-                                "ListTest.kt",
-                                "StringTest.kt");
+        performStdLibTest(EcmaVersion.all(),
+                          "libraries/stdlib/test",
+                          //"dom/DomTest.kt",
+                          //"js/MapTest.kt",
+                          "ListTest.kt",
+                          "StringTest.kt");
     }
 }
diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibToJSTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibToJSTest.java
index 1a6b70ff925..51cf40a85e4 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibToJSTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibToJSTest.java
@@ -20,14 +20,10 @@ import org.jetbrains.k2js.config.EcmaVersion;
 
 /**
  */
-//TODO: fails due to some frontend bug
-public abstract class StdLibToJSTest extends StdLibTestSupport {
+public class StdLibToJSTest extends StdLibTestBase {
 
     public void testCompileJavaScriptFiles() throws Exception {
-        generateJavaScriptFiles(EcmaVersion.all(),
-                                "libraries/stdlib/src",
-                                "kotlin/Preconditions.kt",
-                                "kotlin/dom/Dom.kt",
-                                "kotlin/support/AbstractIterator.kt");
+        performStdLibTest(EcmaVersion.all(),
+                          "libraries/stdlib/src");
     }
 }
diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/WebDemoExamples2Test.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/WebDemoExamples2Test.java
index 28afb839d55..db3b2c65bbf 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/WebDemoExamples2Test.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/WebDemoExamples2Test.java
@@ -36,7 +36,9 @@ public final class WebDemoExamples2Test extends SingleFileTranslationTest {
         performTestWithMain("life", "", "2");
     }
 
-    public void testBuilder() throws Exception {
+    //TODO: fails because it need code from stdlib
+    @SuppressWarnings("UnusedDeclaration")
+    public void _testBuilder() throws Exception {
         performTestWithMain("builder", "");
         performTestWithMain("builder", "1", "over9000");
     }
diff --git a/js/js.tests/test/org/jetbrains/k2js/test/utils/TranslationUtils.java b/js/js.tests/test/org/jetbrains/k2js/test/utils/TranslationUtils.java
index 18be76ab51f..cf9d3e3375f 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/utils/TranslationUtils.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/utils/TranslationUtils.java
@@ -38,7 +38,6 @@ import org.jetbrains.k2js.test.config.TestConfig;
 import org.jetbrains.k2js.utils.JetFileUtils;
 
 import java.io.*;
-import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 
@@ -58,9 +57,21 @@ public final class TranslationUtils {
     @Nullable
     private static BindingContext libraryContext = null;
 
+    @Nullable
+    private static List<JetFile> libFiles = null;
+
     @NotNull
-    public static BindingContext getLibraryContext(@NotNull Project project, @NotNull List<JetFile> allLibFiles) {
+    private static List<JetFile> getAllLibFiles(@NotNull Project project) {
+        if (libFiles == null) {
+            libFiles = initLibFiles(project);
+        }
+        return libFiles;
+    }
+
+    @NotNull
+    public static BindingContext getLibraryContext(@NotNull Project project) {
         if (libraryContext == null) {
+            List<JetFile> allLibFiles = getAllLibFiles(project);
             Predicate<PsiFile> filesWithCode = new Predicate<PsiFile>() {
                 @Override
                 public boolean apply(@javax.annotation.Nullable PsiFile file) {
@@ -75,17 +86,6 @@ public final class TranslationUtils {
         return libraryContext;
     }
 
-    @NotNull
-    public static List<JetFile> getFilesWithCode(@NotNull List<JetFile> allLibFiles) {
-        List<JetFile> result = Lists.newArrayList();
-        for (JetFile file : allLibFiles) {
-            if (isFileWithCode(file)) {
-                result.add(file);
-            }
-        }
-        return result;
-    }
-
     private static boolean isFileWithCode(@NotNull JetFile file) {
         for (String filename : Config.LIB_FILES_WITH_CODE) {
             if (file.getName().contains(filename)) {
@@ -99,8 +99,8 @@ public final class TranslationUtils {
     public static Config getConfig(@NotNull Project project, @NotNull EcmaVersion version) {
         Config config = testConfigs.get(version);
         if (config == null) {
-            List<JetFile> allLibFiles = initLibFiles(project);
-            config = new TestConfig(project, version, getFilesWithCode(allLibFiles), getLibraryContext(project, allLibFiles));
+            BindingContext preanalyzedContext = getLibraryContext(project);
+            config = new TestConfig(project, version, getLibFilesWithCode(getAllLibFiles(project)), preanalyzedContext);
             testConfigs.put(version, config);
         }
         return config;
@@ -127,9 +127,25 @@ public final class TranslationUtils {
     }
 
     @NotNull
-    public static List<JetFile> initLibFiles(@NotNull Project project) {
-        List<JetFile> libFiles = new ArrayList<JetFile>();
-        for (String libFileName : Config.LIB_FILE_NAMES) {
+    private static List<JetFile> initLibFiles(@NotNull Project project) {
+        return getLibFiles(project, Config.LIB_FILE_NAMES);
+    }
+
+    @NotNull
+    private static List<JetFile> getLibFilesWithCode(@NotNull List<JetFile> allFiles) {
+        List<JetFile> result = Lists.newArrayList();
+        for (JetFile file : allFiles) {
+            if (isFileWithCode(file)) {
+                result.add(file);
+            }
+        }
+        return result;
+    }
+
+    @NotNull
+    private static List<JetFile> getLibFiles(@NotNull Project project, @NotNull List<String> list) {
+        List<JetFile> libFiles = Lists.newArrayList();
+        for (String libFileName : list) {
             JetFile file = null;
             try {
                 @SuppressWarnings("IOResourceOpenedButNotSafelyClosed")
diff --git a/js/js.translator/src/org/jetbrains/k2js/analyze/AnalyzerFacadeForJS.java b/js/js.translator/src/org/jetbrains/k2js/analyze/AnalyzerFacadeForJS.java
index 3b5a10dafb1..cc1ce4e3b43 100644
--- a/js/js.translator/src/org/jetbrains/k2js/analyze/AnalyzerFacadeForJS.java
+++ b/js/js.translator/src/org/jetbrains/k2js/analyze/AnalyzerFacadeForJS.java
@@ -35,12 +35,11 @@ import org.jetbrains.jet.lang.psi.JetPsiFactory;
 import org.jetbrains.jet.lang.resolve.*;
 import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.lang.resolve.name.Name;
-import org.jetbrains.jet.lang.resolve.scopes.JetScope;
 import org.jetbrains.jet.lang.resolve.scopes.WritableScope;
 import org.jetbrains.jet.lang.types.lang.JetStandardClasses;
 import org.jetbrains.k2js.config.Config;
 
-import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -52,6 +51,11 @@ import static org.jetbrains.jet.lang.resolve.DescriptorUtils.isRootNamespace;
  */
 public final class AnalyzerFacadeForJS {
 
+    @NotNull
+    public static final List<ImportPath> DEFAULT_IMPORT_PATHS = Arrays.asList(new ImportPath("js.*"), new ImportPath("java.lang.*"),
+                                                               new ImportPath(JetStandardClasses.STANDARD_CLASSES_FQNAME, true),
+                                                               new ImportPath("kotlin.*"));
+
     private AnalyzerFacadeForJS() {
     }
 
@@ -59,7 +63,7 @@ public final class AnalyzerFacadeForJS {
     public static BindingContext analyzeFilesAndCheckErrors(@NotNull List<JetFile> files,
             @NotNull Config config) {
         BindingContext bindingContext = analyzeFiles(files, Predicates.<PsiFile>alwaysTrue(), config).getBindingContext();
-        checkForErrors(withJsLibAdded(files, config), bindingContext);
+        checkForErrors(Config.withJsLibAdded(files, config), bindingContext);
         return bindingContext;
     }
 
@@ -103,7 +107,7 @@ public final class AnalyzerFacadeForJS {
         try {
             Collection<JetFile> allFiles = libraryBindingContext != null ?
                                            files :
-                                           withJsLibAdded(files, config);
+                                           Config.withJsLibAdded(files, config);
             injector.getTopDownAnalyzer().analyzeFiles(allFiles, Collections.<AnalyzerScriptParameter>emptyList());
             BodiesResolveContext bodiesResolveContext = storeContextForBodiesResolve ?
                                                         new CachedBodiesResolveContext(injector.getTopDownAnalysisContext()) :
@@ -133,14 +137,6 @@ public final class AnalyzerFacadeForJS {
         }
     }
 
-    @NotNull
-    public static Collection<JetFile> withJsLibAdded(@NotNull Collection<JetFile> files, @NotNull Config config) {
-        Collection<JetFile> allFiles = new ArrayList<JetFile>();
-        allFiles.addAll(files);
-        allFiles.addAll(config.getLibFiles());
-        return allFiles;
-    }
-
     @NotNull
     private static Predicate<PsiFile> notLibFiles(@NotNull final List<JetFile> jsLibFiles) {
         return new Predicate<PsiFile>() {
@@ -167,11 +163,9 @@ public final class AnalyzerFacadeForJS {
 
         @Override
         public void addDefaultImports(@NotNull Collection<JetImportDirective> directives) {
-            //TODO: these things should not be hard-coded like that
-            directives.add(JetPsiFactory.createImportDirective(project, new ImportPath("js.*")));
-            directives.add(JetPsiFactory.createImportDirective(project, new ImportPath("java.lang.*")));
-            directives.add(JetPsiFactory.createImportDirective(project, new ImportPath(JetStandardClasses.STANDARD_CLASSES_FQNAME, true)));
-            directives.add(JetPsiFactory.createImportDirective(project, new ImportPath("kotlin.*")));
+            for (ImportPath path : DEFAULT_IMPORT_PATHS) {
+                directives.add(JetPsiFactory.createImportDirective(project, path));
+            }
         }
 
         @Override
@@ -182,13 +176,20 @@ public final class AnalyzerFacadeForJS {
             if (contextToBaseOn == null) {
                 return;
             }
-            if (!isRootNamespace(namespaceDescriptor)) {
-                return;
+            if (isNamespaceImportedByDefault(namespaceDescriptor) || isRootNamespace(namespaceDescriptor)) {
+                FqName descriptorName = DescriptorUtils.getFQName(namespaceDescriptor).toSafe();
+                NamespaceDescriptor alreadyAnalyzedNamespace = contextToBaseOn.get(BindingContext.FQNAME_TO_NAMESPACE_DESCRIPTOR, descriptorName);
+                namespaceMemberScope.importScope(alreadyAnalyzedNamespace.getMemberScope());
             }
-            NamespaceDescriptor rootNamespaceScope = contextToBaseOn.get(BindingContext.FQNAME_TO_NAMESPACE_DESCRIPTOR, FqName.ROOT);
-            assert rootNamespaceScope != null;
-            JetScope memberScope = rootNamespaceScope.getMemberScope();
-            namespaceMemberScope.importScope(memberScope);
+        }
+
+        private static boolean isNamespaceImportedByDefault(@NotNull NamespaceDescriptor namespaceDescriptor) {
+            for (ImportPath path : DEFAULT_IMPORT_PATHS) {
+                if (path.fqnPart().equals(DescriptorUtils.getFQName(namespaceDescriptor).toSafe())) {
+                    return true;
+                }
+            }
+            return false;
         }
     }
 }
diff --git a/js/js.translator/src/org/jetbrains/k2js/config/Config.java b/js/js.translator/src/org/jetbrains/k2js/config/Config.java
index c2e89f832ec..bc6bac5b61b 100644
--- a/js/js.translator/src/org/jetbrains/k2js/config/Config.java
+++ b/js/js.translator/src/org/jetbrains/k2js/config/Config.java
@@ -77,9 +77,7 @@ public abstract class Config {
     );
 
     @NotNull
-    public static final List<String> LIB_FILES_WITH_CODE = Arrays.asList(
-            "/stdlib/JUMaps.kt"
-    );
+    public static final List<String> LIB_FILES_WITH_CODE = Lists.newArrayList();
 
     @NotNull
     public static final List<String> LIB_FILE_NAMES = Lists.newArrayList();
@@ -94,7 +92,7 @@ public abstract class Config {
     @NotNull
     public static final List<String> LIB_FILE_NAMES_DEPENDENT_ON_STDLIB = Arrays.asList(
             "/stdlib/jutil.kt",
-            "/stdlib/JUMaps.kt",
+            //"/stdlib/JUMaps.kt",
             "/stdlib/test.kt",
             "/core/stringDefs.kt",
             "/core/strings.kt"