diff --git a/js/js.serializer/src/org/jetbrains/kotlin/serialization/js/jsProtoBufUtil.kt b/js/js.serializer/src/org/jetbrains/kotlin/serialization/js/jsProtoBufUtil.kt
new file mode 100644
index 00000000000..d083e035be9
--- /dev/null
+++ b/js/js.serializer/src/org/jetbrains/kotlin/serialization/js/jsProtoBufUtil.kt
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.serialization.js
+
+import org.jetbrains.kotlin.serialization.ClassData
+import org.jetbrains.kotlin.serialization.PackageData
+import org.jetbrains.kotlin.serialization.ProtoBuf
+import org.jetbrains.kotlin.serialization.deserialization.NameResolver
+import java.io.ByteArrayInputStream
+
+public fun ByteArray.toPackageData(nameResolver: NameResolver): PackageData {
+    val registry = KotlinJavascriptSerializedResourcePaths.EXTENSION_REGISTRY
+    val packageProto = ProtoBuf.Package.parseFrom(ByteArrayInputStream(this), registry)
+    return PackageData(nameResolver, packageProto)
+}
+
+public fun ByteArray.toClassData(nameResolver: NameResolver): ClassData {
+    val registry = KotlinJavascriptSerializedResourcePaths.EXTENSION_REGISTRY
+    val classProto = ProtoBuf.Class.parseFrom(ByteArrayInputStream(this), registry)
+    return ClassData(nameResolver, classProto)
+}
+