scoped polyfill for now

app/assets/javascripts/vue_pipelines_index/index.js.es6

@@ -3,6 +3,7 @@
 
 //= require vue-resource
 
+//= require ./object_assign.js.es6
 //= require ./store.js.es6
 //= require ./pipeline_url.js.es6
 //= require ./pipeline_head.js.es6

app/assets/javascripts/vue_pipelines_index/object_assign.js.es6

+/* eslint-disable */
+
+/* global Vue, gl */
+/* eslint-disable no-param-reassign */
+(() => {
+  if (typeof Object.assign != 'function') {
+    (function () {
+      Object.assign = function (target) {
+        'use strict';
+        // We must check against these specific cases.
+        if (target === undefined || target === null) {
+          throw new TypeError('Cannot convert undefined or null to object');
+        }
+
+        var output = Object(target);
+        for (var index = 1; index < arguments.length; index++) {
+          var source = arguments[index];
+          if (source !== undefined && source !== null) {
+            for (var nextKey in source) {
+              if (source.hasOwnProperty(nextKey)) {
+                output[nextKey] = source[nextKey];
+              }
+            }
+          }
+        }
+        return output;
+      };
+    })();
+  }
+})();