DEV: adds Object.entries and Object.assign polyfills (#6173)

app/assets/javascripts/application.js

@@ -3,6 +3,7 @@
 //= require ./ember-addons/macro-alias
 //= require ./ember-addons/ember-computed-decorators
 //= require ./ember-addons/fmt
+//= require ./polyfills
 //= require_tree ./discourse-common
 //= require_tree ./select-kit
 //= require ./discourse

app/assets/javascripts/polyfills.js

@@ -0,0 +1,43 @@
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries
+if (!Object.entries) {
+  Object.entries = function( obj ){
+    var ownProps = Object.keys( obj ),
+        i = ownProps.length,
+        resArray = new Array(i); // preallocate the Array
+    while (i--)
+      resArray[i] = [ownProps[i], obj[ownProps[i]]];
+
+    return resArray;
+  };
+}
+
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
+if (typeof Object.assign !== 'function') {
+  // Must be writable: true, enumerable: false, configurable: true
+  Object.defineProperty(Object, "assign", {
+    value: function assign(target) { // .length of function is 2
+      'use strict';
+      if (target == null) { // TypeError if undefined or null
+        throw new TypeError('Cannot convert undefined or null to object');
+      }
+
+      var to = Object(target);
+
+      for (var index = 1; index < arguments.length; index++) {
+        var nextSource = arguments[index];
+
+        if (nextSource != null) { // Skip over if undefined or null
+          for (var nextKey in nextSource) {
+            // Avoid bugs when hasOwnProperty is shadowed
+            if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
+              to[nextKey] = nextSource[nextKey];
+            }
+          }
+        }
+      }
+      return to;
+    },
+    writable: true,
+    configurable: true
+  });
+}