From 9ece62fa0f8145dd427b42c051c52d4f9ac84e4d Mon Sep 17 00:00:00 2001
From: Zalim Bashorov <Zalim.Bashorov@jetbrains.com>
Date: Tue, 9 Aug 2016 20:47:16 +0300
Subject: [PATCH] JS backend: fix runtime type checking for interfaces

---
 js/js.translator/testData/kotlin_lib_ecma5.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/js/js.translator/testData/kotlin_lib_ecma5.js b/js/js.translator/testData/kotlin_lib_ecma5.js
index 66b39a14950..6d1b30776fe 100644
--- a/js/js.translator/testData/kotlin_lib_ecma5.js
+++ b/js/js.translator/testData/kotlin_lib_ecma5.js
@@ -366,12 +366,18 @@
         return false;
     }
 
+    /**
+     *
+     * @param {*} object
+     * @param {Function|Object} klass
+     * @returns {Boolean}
+     */
     Kotlin.isType = function (object, klass) {
         if (object == null || klass == null || (typeof object !== 'object' && typeof object !== 'function')) {
             return false;
         }
         else {
-            if (object instanceof klass) {
+            if (typeof klass === "function" && object instanceof klass) {
                 return true;
             }
             else if (isNativeClass(klass) || klass.$metadata$.type == Kotlin.TYPE.CLASS) {