diff --git a/dist/index.js b/dist/index.js
index 2da09817..4b988052 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -2792,7 +2792,7 @@ exports.FunctionObfuscator = FunctionObfuscator;
 "use strict";
 "use strict";
 
-var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol ? "symbol" : typeof obj; };
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
 
 var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
 
@@ -3205,7 +3205,7 @@ exports.BooleanLiteralReplacer = BooleanLiteralReplacer;
 "use strict";
 "use strict";
 
-var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol ? "symbol" : typeof obj; };
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
 
 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
 
@@ -3734,7 +3734,7 @@ exports.AtobTemplate = AtobTemplate;
 "use strict";
 
 function ConsoleOutputDisableExpressionTemplate() {
-    return "\n        (function () {\n            var _ = '(\u0004\u0006\u0003\u0005[]' + '[\"filter\"][\"\u0007tructor\"]' + '(\"return this\")()' + '.' + '\u0003;\u0006\u0002\u0005\u0004};' + '_\u0003.log\u0001.in' + 'fo\u0001.' + 'war' + 'n\u0001.er' + 'r' + 'or\u0001})();' + '\u0001\u0005_\u0002;' + '_\u0003\u0002function' + '\u0003\u0007ole\u0004\u0002 ()' + '{\u0005 = \u0006var ' + '_\u0007cons', \n                Y, \n                $;\n            \n            for (Y in $ = \"\u0007\u0006\u0005\u0004\u0003\u0002\u0001\") {\n              var arr = _.split($[Y]);\n              _ = arr.join(arr.pop());\n            }\n            \n            [][\"filter\"][\"constructor\"](_)();\n        })()\n    ";
+    return "\n        (function () {\n            var _ = '(\x04\x06\x03\x05[]' + '[\"filter\"][\"\x07tructor\"]' + '(\"return this\")()' + '.' + '\x03;\x06\x02\x05\x04};' + '_\x03.log\x01.in' + 'fo\x01.' + 'war' + 'n\x01.er' + 'r' + 'or\x01})();' + '\x01\x05_\x02;' + '_\x03\x02function' + '\x03\x07ole\x04\x02 ()' + '{\x05 = \x06var ' + '_\x07cons', \n                Y, \n                $;\n            \n            for (Y in $ = \"\x07\x06\x05\x04\x03\x02\x01\") {\n              var arr = _.split($[Y]);\n              _ = arr.join(arr.pop());\n            }\n            \n            [][\"filter\"][\"constructor\"](_)();\n        })()\n    ";
 }
 exports.ConsoleOutputDisableExpressionTemplate = ConsoleOutputDisableExpressionTemplate;
 
diff --git a/package.json b/package.json
index 1b97df16..a5e4adf6 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "javascript-obfuscator": "./bin/javascript-obfuscator.js"
   },
   "dependencies": {
-    "babel-polyfill": "^6.13.0",
+    "babel-polyfill": "^6.16.0",
     "chance": "^1.0.4",
     "class-validator": "^0.6.1",
     "commander": "^2.9.0",
@@ -43,7 +43,7 @@
     "@types/joi": "^9.0.32",
     "@types/mkdirp": "^0.3.29",
     "@types/mocha": "^2.2.32",
-    "@types/node": "^6.0.41",
+    "@types/node": "^6.0.42",
     "@types/sinon": "^1.16.31",
     "awesome-typescript-loader": "^2.2.4",
     "babel-cli": "^6.16.0",
@@ -57,7 +57,7 @@
     "sinon": "^2.0.0-pre.3",
     "ts-node": "^1.3.0",
     "tslint": "^3.15.1",
-    "typescript": "^2.0.0",
+    "typescript": "^2.0.3",
     "webpack": "^2.1.0-beta.25",
     "webpack-node-externals": "^1.4.3"
   },
diff --git a/test/performance-tests/JavaScriptObfuscatorPerformance.spec.ts b/test/performance-tests/JavaScriptObfuscatorPerformance.spec.ts
index 4cc6c715..a50ea1fd 100644
--- a/test/performance-tests/JavaScriptObfuscatorPerformance.spec.ts
+++ b/test/performance-tests/JavaScriptObfuscatorPerformance.spec.ts
@@ -8,10 +8,10 @@ describe('JavaScriptObfuscator performance', () => {
     const iterationsCount: number = 500;
 
     describe('performance', () => {
-        it('should returns object with obfuscated code and empty source map', function () {
+        it('should returns object with obfuscated code and empty source map', function (): void {
             this.timeout(15000);
 
-            for (let i = 0; i < iterationsCount; i++) {
+            for (let i: number = 0; i < iterationsCount; i++) {
                 JavaScriptObfuscator.obfuscate(readFileAsString('./test/fixtures/sample.js'));
             }