added back babel-polyfill

index.ts

@@ -2,4 +2,8 @@
 
 import { JavaScriptObfuscator } from './src/JavaScriptObfuscator';
 
+if (!(<any>global)._babelPolyfill) {
+    require('babel-polyfill');
+}
+
 module.exports = JavaScriptObfuscator;

package.json

@@ -16,6 +16,7 @@
     "javascript-obfuscator": "./bin/javascript-obfuscator.js"
   },
   "dependencies": {
+    "babel-polyfill": "^6.9.1",
     "chance": "^1.0.3",
     "commander": "^2.9.0",
     "escodegen": "^1.8.0",