diff --git a/compiler/util/src/org/jetbrains/kotlin/utils/LibraryUtils.kt b/compiler/util/src/org/jetbrains/kotlin/utils/LibraryUtils.kt
index 1def8df889a..f8c6a59fca7 100644
--- a/compiler/util/src/org/jetbrains/kotlin/utils/LibraryUtils.kt
+++ b/compiler/util/src/org/jetbrains/kotlin/utils/LibraryUtils.kt
@@ -20,6 +20,7 @@ import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.util.io.FileUtil
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.util.Processor
+import org.jetbrains.kotlin.utils.fileUtils.withReplacedExtensionOrNull
 import java.io.*
 import java.util.Properties
 import java.util.jar.Attributes
@@ -112,37 +113,38 @@ public object LibraryUtils {
     }
 
     platformStatic
-    public fun readJsFiles(libraries: List<String>): List<String> {
-        val files = arrayListOf<String>()
-        val libs = libraries.map { File(it) }.filter { it.exists() }
+    public fun traverseJsLibraries(libs: List<File>, action: (content: String, path: String)->Unit) {
+        libs.forEach { traverseJsLibrary(it, action) }
+    }
 
-        for (lib in libs) {
-            when {
-                lib.isDirectory() ->
-                    traverseDirectory(lib) { file, path ->
-                        files.add(FileUtil.loadFile(file))
-                    }
-                FileUtil.isJarOrZip(lib) ->
-                    traverseArchive(lib) { content, path ->
-                        files.add(content)
-                    }
-                lib.getName().endsWith(KotlinJavascriptMetadataUtils.JS_EXT) ->
-                    files.add(FileUtil.loadFile(lib))
-                else ->
-                    throw IllegalArgumentException("Unknown library format (directory, zip or js file expected): $lib")
+    platformStatic
+    public fun traverseJsLibrary(lib: File, action: (content: String, path: String)->Unit) {
+        when {
+            lib.isDirectory() -> traverseDirectory(lib, action)
+            FileUtil.isJarOrZip(lib) -> traverseArchive(lib, action)
+            lib.getName().endsWith(KotlinJavascriptMetadataUtils.JS_EXT) -> {
+                lib.runIfFileExists(action)
+                val jsFile = lib.withReplacedExtensionOrNull(KotlinJavascriptMetadataUtils.META_JS_SUFFIX, KotlinJavascriptMetadataUtils.JS_EXT)
+                jsFile?.runIfFileExists(action)
             }
+            else ->
+                throw IllegalArgumentException("Unknown library format (directory, zip or js file expected): $lib")
         }
+    }
 
-        return files
+    private fun File.runIfFileExists(action: (content: String, path: String)->Unit) {
+        if (isFile()) {
+            action(FileUtil.loadFile(this), "")
+        }
     }
 
     private fun copyJsFilesFromDirectory(dir: File, outputLibraryJsPath: String) {
         traverseDirectory(dir) {
-            file, relativePath -> FileUtil.copy(file, File(outputLibraryJsPath, relativePath))
+            content, relativePath -> FileUtil.writeToFile(File(outputLibraryJsPath, relativePath), content)
         }
     }
 
-    private fun processDirectory(dir: File, action: (File, relativePath: String) -> Unit) {
+    private fun processDirectory(dir: File, action: (content: String, relativePath: String) -> Unit) {
         FileUtil.processFilesRecursively(dir, object : Processor<File> {
             override fun process(file: File): Boolean {
                 val relativePath = FileUtil.getRelativePath(dir, file) ?: throw IllegalArgumentException("relativePath should not be null " + dir + " " + file)
@@ -150,14 +152,14 @@ public object LibraryUtils {
                     val suggestedRelativePath = getSuggestedPath(relativePath)
                     if (suggestedRelativePath == null) return true
 
-                    action(file, suggestedRelativePath)
+                    action(FileUtil.loadFile(file), suggestedRelativePath)
                 }
                 return true
             }
         })
     }
 
-    fun traverseDirectory(dir: File, action: (File, relativePath: String) -> Unit) {
+    fun traverseDirectory(dir: File, action: (content: String, relativePath: String) -> Unit) {
         try {
             processDirectory(dir, action)
         }
diff --git a/compiler/util/src/org/jetbrains/kotlin/utils/fileUtils.kt b/compiler/util/src/org/jetbrains/kotlin/utils/fileUtils.kt
index 7f108fabd21..e340169223d 100644
--- a/compiler/util/src/org/jetbrains/kotlin/utils/fileUtils.kt
+++ b/compiler/util/src/org/jetbrains/kotlin/utils/fileUtils.kt
@@ -21,3 +21,14 @@ import java.io.File
 // TODO: move to stdlib as:
 // public fun File?.readTextOrEmpty(encoding: String = Charset.defaultCharset().name()): String = this?.readText(encoding) ?: ""
 public fun File?.readTextOrEmpty(): String = this?.readText() ?: ""
+
+public fun File.withReplacedExtensionOrNull(oldExt: String, newExt: String): File? {
+    if (getName().endsWith(oldExt)) {
+        val path = getPath()
+        val pathWithoutExt = path.substring(0, path.length() - oldExt.length())
+        val pathWithNewExt = pathWithoutExt + newExt
+        return File(pathWithNewExt)
+    }
+
+    return null
+}
\ No newline at end of file
diff --git a/js/js.inliner/src/org/jetbrains/kotlin/js/inline/FunctionReader.kt b/js/js.inliner/src/org/jetbrains/kotlin/js/inline/FunctionReader.kt
index 1d1e1cd688f..4ae6038fbb8 100644
--- a/js/js.inliner/src/org/jetbrains/kotlin/js/inline/FunctionReader.kt
+++ b/js/js.inliner/src/org/jetbrains/kotlin/js/inline/FunctionReader.kt
@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.js.inline
 import com.google.dart.compiler.backend.js.ast.*
 import com.google.dart.compiler.backend.js.ast.metadata.inlineStrategy
 import com.google.gwt.dev.js.ThrowExceptionOnErrorReporter
+import com.intellij.openapi.util.io.FileUtil
 import com.intellij.util.containers.SLRUCache
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
@@ -32,9 +33,11 @@ import org.jetbrains.kotlin.js.translate.reference.CallExpressionTranslator
 import org.jetbrains.kotlin.js.translate.utils.JsDescriptorUtils.getExternalModuleName
 import org.jetbrains.kotlin.resolve.descriptorUtil.isExtension
 import org.jetbrains.kotlin.resolve.inline.InlineStrategy
+import org.jetbrains.kotlin.utils.KotlinJavascriptMetadataUtils
 import org.jetbrains.kotlin.utils.LibraryUtils
 import org.jetbrains.kotlin.utils.sure
 import java.io.File
+import kotlin.platform.platformStatic
 
 // TODO: add hash checksum to defineModule?
 /**
@@ -65,17 +68,16 @@ public class FunctionReader(private val context: TranslationContext) {
     init {
         val config = context.getConfig() as LibrarySourcesConfig
         val libs = config.getLibraries().map { File(it) }
-        val files = LibraryUtils.readJsFiles(libs.map { it.getPath() }.toList())
 
-        for (file in files) {
-            val matcher = DEFINE_MODULE_PATTERN.matcher(file)
+        LibraryUtils.traverseJsLibraries(libs) { fileContent, path ->
+            val matcher = DEFINE_MODULE_PATTERN.toPattern().matcher(fileContent)
 
             while (matcher.find()) {
                 val moduleName = matcher.group(3)
                 val moduleVariable = matcher.group(4)
                 val kotlinVariable = matcher.group(1)
                 assert(moduleName !in moduleJsDefinition) { "Module is defined in more, than one file" }
-                moduleJsDefinition[moduleName] = file
+                moduleJsDefinition[moduleName] = fileContent
                 moduleRootVariable[moduleName] = moduleVariable
                 moduleKotlinVariable[moduleName] = kotlinVariable
             }