Add missing flash import

app/assets/javascripts/vue_merge_request_widget/components/states/work_in_progress.vue

 <script>
 import $ from 'jquery';
+import { __ } from '~/locale';
+import createFlash from '~/flash';
 import statusIcon from '../mr_widget_status_icon.vue';
 import tooltip from '../../../vue_shared/directives/tooltip';
 import eventHub from '../../event_hub';
@@ -29,12 +31,12 @@ export default {
         .then(res => res.data)
         .then(data => {
           eventHub.$emit('UpdateWidgetData', data);
-          new window.Flash('The merge request can now be merged.', 'notice'); // eslint-disable-line
+          createFlash(__('The merge request can now be merged.'), 'notice');
           $('.merge-request .detail-page-description .title').text(this.mr.title);
         })
         .catch(() => {
           this.isMakingRequest = false;
-          new window.Flash('Something went wrong. Please try again.'); // eslint-disable-line
+          createFlash(__('Something went wrong. Please try again.'));
         });
     },
   },

locale/gitlab.pot

@@ -15527,6 +15527,9 @@ msgstr ""
 msgid "The merge conflicts for this merge request have already been resolved. Please return to the merge request."
 msgstr ""
 
+msgid "The merge request can now be merged."
+msgstr ""
+
 msgid "The name %{entryName} is already taken in this directory."
 msgstr ""
 

spec/javascripts/vue_mr_widget/components/states/mr_widget_wip_spec.js

@@ -47,7 +47,7 @@ describe('Wip', () => {
       it('should make a request to service and handle response', done => {
         const vm = createComponent();
 
-        spyOn(window, 'Flash').and.returnValue(true);
+        const flashSpy = spyOnDependency(WorkInProgress, 'createFlash').and.returnValue(true);
         spyOn(eventHub, '$emit');
         spyOn(vm.service, 'removeWIP').and.returnValue(
           new Promise(resolve => {
@@ -61,10 +61,7 @@ describe('Wip', () => {
         setTimeout(() => {
           expect(vm.isMakingRequest).toBeTruthy();
           expect(eventHub.$emit).toHaveBeenCalledWith('UpdateWidgetData', mrObj);
-          expect(window.Flash).toHaveBeenCalledWith(
-            'The merge request can now be merged.',
-            'notice',
-          );
+          expect(flashSpy).toHaveBeenCalledWith('The merge request can now be merged.', 'notice');
           done();
         }, 333);
       });