Load polyfills for browsers that don't support certain features

Author: Mateusz Krzeszowiak

app/code/Magento/Ui/view/base/requirejs-config.js

@@ -4,6 +4,7 @@
  */
 
 var config = {
+    deps: [],
     shim: {
         'chartjs/Chart.min': ['moment'],
         'tiny_mce_4/tinymce.min': {
@@ -30,3 +31,27 @@ var config = {
         }
     }
 };
+
+/**
+ * Adds polyfills only for browser contexts which prevents bundlers from including them.
+ */
+if (typeof window !== "undefined" && window.document) {
+    /**
+     * Polyfill Map and WeakMap for older browsers that do not support them.
+     */
+    if (typeof Map === 'undefined' || typeof WeakMap === 'undefined'){
+        config.deps.push('es6-collections');
+    }
+    /**
+     * Polyfill MutationObserver only for the browsers that do not support it.
+     */
+    if (typeof MutationObserver === 'undefined') {
+        config.deps.push('MutationObserver');
+    }
+    /**
+     * Polyfill FormData object for old browsers that don't have full support for it.
+     */
+    if (typeof FormData === 'undefined' || typeof FormData.prototype.get === 'undefined') {
+        config.deps.push('FormData');
+    }
+}

app/code/Magento/Ui/view/base/web/js/lib/core/events.js

@@ -6,8 +6,7 @@
 /* global WeakMap, Map*/
 define([
     'ko',
-    'underscore',
-    'es6-collections'
+    'underscore'
 ], function (ko, _) {
     'use strict';
 

app/code/Magento/Ui/view/base/web/js/lib/knockout/extender/bound-nodes.js

@@ -8,8 +8,7 @@ define([
     'ko',
     'underscore',
     'mage/utils/wrapper',
-    'uiEvents',
-    'es6-collections'
+    'uiEvents'
 ], function (ko, _, wrapper, Events) {
     'use strict';
 

app/code/Magento/Ui/view/base/web/js/lib/registry/registry.js

@@ -9,8 +9,7 @@
 /* global WeakMap */
 define([
     'jquery',
-    'underscore',
-    'es6-collections'
+    'underscore'
 ], function ($, _) {
     'use strict';
 

app/code/Magento/Ui/view/base/web/js/lib/view/utils/dom-observer.js

@@ -5,7 +5,6 @@
 define([
     'jquery',
     'underscore',
-    'MutationObserver',
     'domReady!'
 ], function ($, _) {
     'use strict';

app/code/Magento/Ui/view/base/web/js/lib/view/utils/raf.js

@@ -4,9 +4,7 @@
  */
 
 /* global WeakMap */
-define([
-    'es6-collections'
-], function () {
+define([], function () {
     'use strict';
 
     var processMap = new WeakMap(),