Add babel-polyfill and remove promise-polyfill

package.json

@@ -18,7 +18,6 @@
     "codemirror-formatting": "^1.0.0",
     "font-awesome": "^4.7.0",
     "keymaster": "^1.6.2",
-    "promise-polyfill": "^6.0.2",
     "spectrum-colorpicker": "^1.8.0",
     "underscore": "^1.8.3"
   },
@@ -26,6 +25,7 @@
     "babel-core": "^6.24.1",
     "babel-loader": "^7.0.0",
     "babel-plugin-transform-object-rest-spread": "^6.26.0",
+    "babel-polyfill": "^6.26.0",
     "babel-preset-env": "^1.6.1",
     "chai": "^4.1.2",
     "cross-env": "^5.0.5",

src/utils/fetch.js

@@ -1,7 +1,3 @@
-import Promise from 'promise-polyfill';
-
-window.Promise = window.Promise || Promise;
-
 export default typeof fetch == 'function' ? fetch.bind() : (url, options) => {
   return new Promise((res, rej) => {
     const req = new XMLHttpRequest();

webpack.config.js

@@ -28,7 +28,7 @@ plugins.push(new webpack.ProvidePlugin({
 }));
 
 module.exports = {
-  entry: './src',
+  entry: ['babel-polyfill', './src'],
   output: {
       filename: './dist/' + name + '.min.js',
       library: 'grapesjs',