Flash is now a ES6 module

Reduced the technical debt around our JS flash function by making it a
module that is imported rather than relying on the global function.
The global function still exists mainly for technical debt with how
some requests are being completed, but new JS should import the module
directly.

Also reduces some tech debt in the file by removing the need for jQuery.
Instead Flash is now 100% vanilla JS.

app/assets/javascripts/awards_handler.js

 /* eslint-disable class-methods-use-this */
-/* global Flash */
 import _ from 'underscore';
 import Cookies from 'js-cookie';
 import { isInIssuePage, updateTooltipTitle } from './lib/utils/common_utils';
+import Flash from './flash';
 
 const animationEndEventString = 'animationend webkitAnimationEnd MSAnimationEnd oAnimationEnd';
 const transitionEndEventString = 'transitionend webkitTransitionEnd oTransitionEnd MSTransitionEnd';

app/assets/javascripts/blob/balsamiq_viewer.js

-/* global Flash */
-
+import Flash from '../flash';
 import BalsamiqViewer from './balsamiq/balsamiq_viewer';
 
 function onError() {
-  const flash = new window.Flash('Balsamiq file could not be loaded.');
+  const flash = new Flash('Balsamiq file could not be loaded.');
 
   return flash;
 }

app/assets/javascripts/blob/file_template_mediator.js

 /* eslint-disable class-methods-use-this */
-/* global Flash */
-
+import Flash from '../flash';
 import FileTemplateTypeSelector from './template_selectors/type_selector';
 import BlobCiYamlSelector from './template_selectors/ci_yaml_selector';
 import DockerfileSelector from './template_selectors/dockerfile_selector';

app/assets/javascripts/blob/viewer/index.js

-/* global Flash */
+import Flash from '../../flash';
 import { handleLocationHash } from '../../lib/utils/common_utils';
 
 export default class BlobViewer {

app/assets/javascripts/boards/boards_bundle.js

 /* eslint-disable one-var, quote-props, comma-dangle, space-before-function-paren */
 /* global BoardService */
-/* global Flash */
 
 import _ from 'underscore';
 import Vue from 'vue';
 import VueResource from 'vue-resource';
+import Flash from '../flash';
 import FilteredSearchBoards from './filtered_search_boards';
 import eventHub from './eventhub';
 import './models/issue';

app/assets/javascripts/boards/components/board_sidebar.js

@@ -3,9 +3,9 @@
 /* global MilestoneSelect */
 /* global LabelsSelect */
 /* global Sidebar */
-/* global Flash */
 
 import Vue from 'vue';
+import Flash from '../../flash';
 import eventHub from '../../sidebar/event_hub';
 import AssigneeTitle from '../../sidebar/components/assignees/assignee_title';
 import Assignees from '../../sidebar/components/assignees/assignees';

app/assets/javascripts/boards/components/modal/footer.js

 /* eslint-disable no-new */
-/* global Flash */
 
 import Vue from 'vue';
+import Flash from '../../../flash';
 import './lists_dropdown';
 
 const ModalStore = gl.issueBoards.ModalStore;

app/assets/javascripts/boards/components/sidebar/remove_issue.js

 /* eslint-disable no-new */
-/* global Flash */
 
 import Vue from 'vue';
+import Flash from '../../../flash';
 
 const Store = gl.issueBoards.BoardsStore;
 

app/assets/javascripts/create_merge_request_dropdown.js

 /* eslint-disable no-new */
-/* global Flash */
+import Flash from './flash';
 import DropLab from './droplab/drop_lab';
 import ISetter from './droplab/plugins/input_setter';
 

app/assets/javascripts/cycle_analytics/cycle_analytics_bundle.js

@@ -2,6 +2,7 @@
 
 import Vue from 'vue';
 import Cookies from 'js-cookie';
+import Flash from '../flash';
 import Translate from '../vue_shared/translate';
 import banner from './components/banner.vue';
 import stageCodeComponent from './components/stage_code_component.vue';

app/assets/javascripts/deploy_keys/components/app.vue

 <script>
-  /* global Flash */
+  import Flash from '../../flash';
   import eventHub from '../eventhub';
   import DeployKeysService from '../service';
   import DeployKeysStore from '../store';

app/assets/javascripts/diff_notes/components/resolve_btn.js

 /* eslint-disable comma-dangle, object-shorthand, func-names, quote-props, no-else-return, camelcase, max-len */
 /* global CommentsStore */
 /* global ResolveService */
-/* global Flash */
 
 import Vue from 'vue';
+import Flash from '../../flash';
 
 const ResolveBtn = Vue.extend({
   props: {

app/assets/javascripts/diff_notes/services/resolve.js

-/* global Flash */
 /* global CommentsStore */
 
 import Vue from 'vue';
+import Flash from '../../flash';
 import '../../vue_shared/vue_resource_interceptor';
 
 window.gl = window.gl || {};

app/assets/javascripts/environments/components/environment.vue

 <script>
-/* global Flash */
 import Visibility from 'visibilityjs';
+import Flash from '../../flash';
 import EnvironmentsService from '../services/environments_service';
 import environmentTable from './environments_table.vue';
 import EnvironmentsStore from '../stores/environments_store';

app/assets/javascripts/environments/folder/environments_folder_view.vue

 <script>
-/* global Flash */
 import Visibility from 'visibilityjs';
+import Flash from '../../flash';
 import EnvironmentsService from '../services/environments_service';
 import environmentTable from '../components/environments_table.vue';
 import EnvironmentsStore from '../stores/environments_store';

app/assets/javascripts/filtered_search/dropdown_emoji.js

-/* global Flash */
-
-import Ajax from '~/droplab/plugins/ajax';
-import Filter from '~/droplab/plugins/filter';
+import Flash from '../flash';
+import Ajax from '../droplab/plugins/ajax';
+import Filter from '../droplab/plugins/filter';
 import './filtered_search_dropdown';
 
 class DropdownEmoji extends gl.FilteredSearchDropdown {

app/assets/javascripts/filtered_search/dropdown_non_user.js

-/* global Flash */
-
-import Ajax from '~/droplab/plugins/ajax';
-import Filter from '~/droplab/plugins/filter';
+import Flash from '../flash';
+import Ajax from '../droplab/plugins/ajax';
+import Filter from '../droplab/plugins/filter';
 import './filtered_search_dropdown';
 
 class DropdownNonUser extends gl.FilteredSearchDropdown {

app/assets/javascripts/filtered_search/dropdown_user.js

-/* global Flash */
-
-import AjaxFilter from '~/droplab/plugins/ajax_filter';
+import Flash from '../flash';
+import AjaxFilter from '../droplab/plugins/ajax_filter';
 import './filtered_search_dropdown';
 import { addClassIfElementExists } from '../lib/utils/dom_utils';
 

app/assets/javascripts/filtered_search/filtered_search_manager.js

+import Flash from '../flash';
 import FilteredSearchContainer from './container';
 import RecentSearchesRoot from './recent_searches_root';
 import RecentSearchesStore from './stores/recent_searches_store';
@@ -36,7 +37,7 @@ class FilteredSearchManager {
       .catch((error) => {
         if (error.name === 'RecentSearchesServiceError') return undefined;
         // eslint-disable-next-line no-new
-        new window.Flash('An error occurred while parsing recent searches');
+        new Flash('An error occurred while parsing recent searches');
         // Gracefully fail to empty array
         return [];
       })

app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js

 import AjaxCache from '../lib/utils/ajax_cache';
-import '../flash'; /* global Flash */
+import Flash from '../flash';
 import FilteredSearchContainer from './container';
 import UsersCache from '../lib/utils/users_cache';
 

app/assets/javascripts/flash.js

-/* eslint-disable func-names, space-before-function-paren, wrap-iife, no-var, one-var, one-var-declaration-per-line, no-param-reassign, quotes, quote-props, prefer-template, comma-dangle, max-len */
+import _ from 'underscore';
 
-window.Flash = (function() {
-  var hideFlash;
+const hideFlash = (flashEl) => {
+  flashEl.style.transition = 'opacity .3s'; // eslint-disable-line no-param-reassign
+  flashEl.style.opacity = '0'; // eslint-disable-line no-param-reassign
 
-  hideFlash = function() {
-    return $(this).fadeOut();
-  };
+  flashEl.addEventListener('transitionend', () => {
+    flashEl.remove();
+  }, {
+    once: true,
+  });
+};
 
-  /**
-   * Flash banner supports different types of Flash configurations
-   * along with ability to provide actionConfig which can be used to show
-   * additional action or link on banner next to message
-   *
-   * @param {String} message Flash message
-   * @param {String} type Type of Flash, it can be `notice` or `alert` (default)
-   * @param {Object} parent Reference to Parent element under which Flash needs to appear
-   * @param {Object} actionConfig Map of config to show action on banner
-   *    @param {String} href URL to which action link should point (default '#')
-   *    @param {String} title Title of action
-   *    @param {Function} clickHandler Method to call when action is clicked on
-   */
-  function Flash(message, type, parent, actionConfig) {
-    var flash, textDiv, actionLink;
-    if (type == null) {
-      type = 'alert';
-    }
-    if (parent == null) {
-      parent = null;
-    }
-    if (parent) {
-      this.flashContainer = parent.find('.flash-container');
-    } else {
-      this.flashContainer = $('.flash-container-page');
-    }
-    this.flashContainer.html('');
-    flash = $('<div/>', {
-      "class": "flash-" + type
-    });
-    flash.on('click', hideFlash);
-    textDiv = $('<div/>', {
-      "class": 'flash-text',
-      text: message
-    });
-    textDiv.appendTo(flash);
+const createAction = config => `
+  <a
+    href="${config.href || '#'}"
+    class="flash-action"
+    ${config.href ? 'role="button"' : ''}
+  >
+    ${_.escape(config.title)}
+  </a>
+`;
 
-    if (actionConfig) {
-      const actionLinkConfig = {
-        class: 'flash-action',
-        href: actionConfig.href || '#',
-        text: actionConfig.title
-      };
+const createFlashEl = (message, type) => `
+  <div
+    class="flash-${type}"
+  >
+    <div
+      class="flash-text"
+    >
+      ${_.escape(message)}
+    </div>
+  </div>
+`;
 
-      if (!actionConfig.href) {
-        actionLinkConfig.role = 'button';
-      }
+const Flash = function Flash(message, type = 'alert', parent = document, actionConfig = null) {
+  const flashContainer = parent.querySelector('.flash-container');
+  flashContainer.innerHTML = createFlashEl(message, type);
 
-      actionLink = $('<a/>', actionLinkConfig);
+  const flashEl = flashContainer.querySelector(`.flash-${type}`);
+  flashEl.addEventListener('click', () => hideFlash(flashEl));
 
-      actionLink.appendTo(flash);
-      this.flashContainer.on('click', '.flash-action', actionConfig.clickHandler);
-    }
-    if (this.flashContainer.parent().hasClass('content-wrapper')) {
-      textDiv.addClass('container-fluid container-limited');
+  if (actionConfig) {
+    flashEl.innerHTML += createAction(actionConfig);
+
+    if (actionConfig.clickHandler) {
+      flashEl.querySelector('.flash-action').addEventListener('click', e => actionConfig.clickHandler(e));
     }
-    flash.appendTo(this.flashContainer);
-    this.flashContainer.show();
   }
 
-  return Flash;
-})();
+  if (flashContainer.parentNode.classList.contains('content-wrapper')) {
+    const flashText = flashEl.querySelector('.flash-text');
+
+    flashText.classList.add('container-fluid');
+    flashText.classList.add('container-limited');
+  }
+
+  flashContainer.style.display = 'block';
+
+  return flashContainer;
+};
+
+export {
+  Flash as default,
+  createFlashEl,
+  hideFlash,
+};
+window.Flash = Flash;

app/assets/javascripts/groups/index.js

-/* global Flash */
-
 import Vue from 'vue';
+import Flash from '../flash';
 import GroupFilterableList from './groups_filterable_list';
 import GroupsComponent from './components/groups.vue';
 import GroupFolder from './components/group_folder.vue';

app/assets/javascripts/integrations/integration_settings_form.js

-/* global Flash */
+import Flash from '../flash';
 
 export default class IntegrationSettingsForm {
   constructor(formSelector) {
@@ -102,7 +102,7 @@ export default class IntegrationSettingsForm {
     })
     .done((res) => {
       if (res.error) {
-        new Flash(`${res.message} ${res.service_response}`, null, null, {
+        new Flash(`${res.message} ${res.service_response}`, 'alert', document, {
           title: 'Save anyway',
           clickHandler: (e) => {
             e.preventDefault();

app/assets/javascripts/issuable_bulk_update_actions.js

 /* eslint-disable comma-dangle, quotes, consistent-return, func-names, array-callback-return, space-before-function-paren, prefer-arrow-callback, max-len, no-unused-expressions, no-sequences, no-underscore-dangle, no-unused-vars, no-param-reassign */
 /* global IssuableIndex */
-/* global Flash */
 import _ from 'underscore';
+import Flash from './flash';
 
 export default {
   init({ container, form, issues, prefixId } = {}) {

app/assets/javascripts/issue.js

 /* eslint-disable func-names, space-before-function-paren, no-var, prefer-rest-params, wrap-iife, one-var, no-underscore-dangle, one-var-declaration-per-line, object-shorthand, no-unused-vars, no-new, comma-dangle, consistent-return, quotes, dot-notation, quote-props, prefer-arrow-callback, max-len */
-/* global Flash */
-
 import 'vendor/jquery.waitforimages';
 import '~/lib/utils/text_utility';
-import './flash';
+import Flash from './flash';
 import TaskList from './task_list';
 import CreateMergeRequestDropdown from './create_merge_request_dropdown';
 import IssuablesHelper from './helpers/issuables_helper';

app/assets/javascripts/issue_show/components/app.vue

 <script>
-/* global Flash */
 import Visibility from 'visibilityjs';
+import Flash from '../../flash';
 import Poll from '../../lib/utils/poll';
 import eventHub from '../event_hub';
 import Service from '../services/index';

app/assets/javascripts/jobs/job_details_mediator.js

-/* global Flash */
 /* global Build */
 
 import Visibility from 'visibilityjs';
+import Flash from '../flash';
 import Poll from '../lib/utils/poll';
 import JobStore from './stores/job_store';
 import JobService from './services/job_service';

app/assets/javascripts/label_manager.js

 /* eslint-disable comma-dangle, class-methods-use-this, no-underscore-dangle, no-param-reassign, no-unused-vars, consistent-return, func-names, space-before-function-paren, max-len */
-/* global Flash */
 /* global Sortable */
 
+import Flash from './flash';
+
 ((global) => {
   class LabelManager {
     constructor({ togglePriorityButton, prioritizedLabels, otherLabels } = {}) {

app/assets/javascripts/main.js

 /* eslint-disable func-names, space-before-function-paren, no-var, quotes, consistent-return, prefer-arrow-callback, comma-dangle, object-shorthand, no-new, max-len, no-multi-spaces, import/newline-after-import, import/first */
-/* global Flash */
 /* global ConfirmDangerModal */
 /* global Aside */
 
@@ -75,7 +74,7 @@ import './diff';
 import './dropzone_input';
 import './due_date_select';
 import './files_comment_button';
-import './flash';
+import Flash from './flash';
 import './gl_dropdown';
 import './gl_field_error';
 import './gl_field_errors';
@@ -168,7 +167,6 @@ $(function () {
   var $document = $(document);
   var $window = $(window);
   var $sidebarGutterToggle = $('.js-sidebar-toggle');
-  var $flash = $('.flash-container');
   var bootstrapBreakpoint = bp.getBreakpointSize();
   var fitSidebarForSize;
 
@@ -253,13 +251,6 @@ $(function () {
   // Form submitter
   });
   gl.utils.localTimeAgo($('abbr.timeago, .js-timeago'), true);
-  // Flash
-  if ($flash.length > 0) {
-    $flash.click(function () {
-      return $(this).fadeOut();
-    });
-    $flash.show();
-  }
   // Disable form buttons while a form is submitting
   $body.on('ajax:complete, ajax:beforeSend, submit', 'form', function (e) {
     var buttons;

app/assets/javascripts/merge_conflicts/components/diff_file_editor.js

 /* eslint-disable comma-dangle, quote-props, no-useless-computed-key, object-shorthand, no-new, no-param-reassign, max-len */
 /* global ace */
-/* global Flash */
 
 import Vue from 'vue';
+import Flash from '../../flash';
 
 ((global) => {
   global.mergeConflicts = global.mergeConflicts || {};

app/assets/javascripts/merge_conflicts/merge_conflicts_bundle.js

 /* eslint-disable new-cap, comma-dangle, no-new */
-/* global Flash */
 
 import Vue from 'vue';
+import Flash from '../flash';
 import initIssuableSidebar from '../init_issuable_sidebar';
 import './merge_conflict_store';
 import './merge_conflict_service';

app/assets/javascripts/merge_request_tabs.js

 /* eslint-disable no-new, class-methods-use-this */
-/* global Flash */
 /* global notes */
 
 import Cookies from 'js-cookie';
-import './flash';
+import Flash from './flash';
 import BlobForkSuggestion from './blob/blob_fork_suggestion';
 import initChangesDropdown from './init_changes_dropdown';
 import bp from './breakpoints';

app/assets/javascripts/milestone.js

 /* eslint-disable func-names, space-before-function-paren, wrap-iife, no-use-before-define, camelcase, quotes, object-shorthand, no-shadow, no-unused-vars, comma-dangle, no-var, prefer-template, no-underscore-dangle, consistent-return, one-var, one-var-declaration-per-line, default-case, prefer-arrow-callback, max-len */
-/* global Flash */
 /* global Sortable */
 
+import Flash from './flash';
+
 (function() {
   this.Milestone = (function() {
     function Milestone() {

app/assets/javascripts/mini_pipeline_graph_dropdown.js

 /* eslint-disable no-new */
-/* global Flash */
+import Flash from './flash';
 
 /**
  * In each pipelines table we have a mini pipeline graph for each pipeline.

app/assets/javascripts/monitoring/components/dashboard.vue

 <script>
-  /* global Flash */
   import _ from 'underscore';
+  import Flash from '../../flash';
   import MonitoringService from '../services/monitoring_service';
   import GraphGroup from './graph_group.vue';
   import Graph from './graph.vue';

app/assets/javascripts/notes.js

@@ -5,7 +5,6 @@ default-case, prefer-template, consistent-return, no-alert, no-return-assign,
 no-param-reassign, prefer-arrow-callback, no-else-return, comma-dangle, no-new,
 brace-style, no-lonely-if, vars-on-top, no-unused-vars, no-sequences, no-shadow,
 newline-per-chained-call, no-useless-escape, class-methods-use-this */
-/* global Flash */
 /* global Autosave */
 /* global ResolveService */
 /* global mrRefreshWidgetUrl */
@@ -18,6 +17,7 @@ import Dropzone from 'dropzone';
 import 'vendor/jquery.caret'; // required by jquery.atwho
 import 'vendor/jquery.atwho';
 import AjaxCache from '~/lib/utils/ajax_cache';
+import Flash from './flash';
 import CommentTypeToggle from './comment_type_toggle';
 import loadAwardsHandler from './awards_handler';
 import './autosave';
@@ -354,7 +354,7 @@ export default class Notes {
             Object.keys(noteEntity.commands_changes).length > 0) {
           $notesList.find('.system-note.being-posted').remove();
         }
-        this.addFlash(noteEntity.errors.commands_only, 'notice', this.parentTimeline);
+        this.addFlash(noteEntity.errors.commands_only, 'notice', this.parentTimeline); // TODO: CHECK THIS!
         this.refresh();
       }
       return;

app/assets/javascripts/notes/components/issue_comment_form.vue

 <script>
-  /* global Flash, Autosave */
+  /* global Autosave */
   import { mapActions, mapGetters } from 'vuex';
   import _ from 'underscore';
   import autosize from 'vendor/autosize';
+  import Flash from '../../flash';
   import '../../autosave';
   import TaskList from '../../task_list';
   import * as constants from '../constants';
@@ -145,7 +146,7 @@
                   Flash(
                     'Something went wrong while adding your comment. Please try again.',
                     'alert',
-                    $(this.$refs.commentForm),
+                    this.$refs.commentForm,
                   );
                 }
               } else {
@@ -160,7 +161,7 @@
               this.isSubmitting = false;
               this.discard(false);
               const msg = 'Your comment could not be submitted! Please check your network connection and try again.';
-              Flash(msg, 'alert', $(this.$el));
+              Flash(msg, 'alert', this.$el);
               this.note = noteData.data.note.note; // Restore textarea content.
               this.removePlaceholderNotes();
             });

app/assets/javascripts/notes/components/issue_discussion.vue

 <script>
-  /* global Flash */
   import { mapActions, mapGetters } from 'vuex';
+  import Flash from '../../flash';
   import { SYSTEM_NOTE } from '../constants';
   import issueNote from './issue_note.vue';
   import userAvatarLink from '../../vue_shared/components/user_avatar/user_avatar_link.vue';
@@ -133,7 +133,7 @@
             this.isReplying = true;
             this.$nextTick(() => {
               const msg = 'Your comment could not be submitted! Please check your network connection and try again.';
-              Flash(msg, 'alert', $(this.$el));
+              Flash(msg, 'alert', this.$el);
               this.$refs.noteForm.note = noteText;
               callback(err);
             });

app/assets/javascripts/notes/components/issue_note.vue

 <script>
-  /* global Flash */
-
   import { mapGetters, mapActions } from 'vuex';
+  import Flash from '../../flash';
   import userAvatarLink from '../../vue_shared/components/user_avatar/user_avatar_link.vue';
   import issueNoteHeader from './issue_note_header.vue';
   import issueNoteActions from './issue_note_actions.vue';
@@ -101,7 +100,7 @@
             this.isEditing = true;
             this.$nextTick(() => {
               const msg = 'Something went wrong while editing your comment. Please try again.';
-              Flash(msg, 'alert', $(this.$el));
+              Flash(msg, 'alert', this.$el);
               this.recoverNoteContent(noteText);
               callback();
             });

app/assets/javascripts/notes/components/issue_note_awards_list.vue

 <script>
-  /* global Flash */
-
   import { mapActions, mapGetters } from 'vuex';
   import emojiSmiling from 'icons/_emoji_slightly_smiling_face.svg';
   import emojiSmile from 'icons/_emoji_smile.svg';
   import emojiSmiley from 'icons/_emoji_smiley.svg';
+  import Flash from '../../flash';
   import { glEmojiTag } from '../../emoji';
   import tooltip from '../../vue_shared/directives/tooltip';
 

app/assets/javascripts/notes/components/issue_notes_app.vue

 <script>
-  /* global Flash */
   import { mapGetters, mapActions } from 'vuex';
+  import Flash from '../../flash';
   import store from '../stores/';
   import * as constants from '../constants';
   import issueNote from './issue_note.vue';

app/assets/javascripts/notes/stores/actions.js

-/* global Flash */
 import Visibility from 'visibilityjs';
+import Flash from '../../flash';
 import Poll from '../../lib/utils/poll';
 import * as types from './mutation_types';
 import * as utils from './utils';
@@ -99,7 +99,7 @@ export const saveNote = ({ commit, dispatch }, noteData) => {
         eTagPoll.makeRequest();
 
         $('.js-gfm-input').trigger('clear-commands-cache.atwho');
-        Flash('Commands applied', 'notice', $(noteData.flashContainer));
+        Flash('Commands applied', 'notice', noteData.flashContainer);
       }
 
       if (commandsChanges) {
@@ -114,8 +114,8 @@ export const saveNote = ({ commit, dispatch }, noteData) => {
             .catch(() => {
               Flash(
                 'Something went wrong while adding your award. Please try again.',
-                null,
-                $(noteData.flashContainer),
+                'alert',
+                noteData.flashContainer,
               );
             });
         }
@@ -126,7 +126,7 @@ export const saveNote = ({ commit, dispatch }, noteData) => {
       }
 
       if (errors && errors.commands_only) {
-        Flash(errors.commands_only, 'notice', $(noteData.flashContainer));
+        Flash(errors.commands_only, 'notice', noteData.flashContainer);
       }
       commit(types.REMOVE_PLACEHOLDER_NOTES);
 

app/assets/javascripts/notifications_dropdown.js

 /* eslint-disable func-names, space-before-function-paren, wrap-iife, one-var, no-var, one-var-declaration-per-line, no-unused-vars, consistent-return, prefer-arrow-callback, no-else-return, max-len */
-/* global Flash */
+import Flash from './flash';
 
 (function() {
   this.NotificationsDropdown = (function() {

app/assets/javascripts/pipelines/components/stage.vue

@@ -13,7 +13,7 @@
  * 4. Commit widget
  */
 
-/* global Flash */
+import Flash from '../../flash';
 import { borderlessStatusIconEntityMap } from '../../vue_shared/ci_status_icons';
 import loadingIcon from '../../vue_shared/components/loading_icon.vue';
 import tooltip from '../../vue_shared/directives/tooltip';

app/assets/javascripts/pipelines/mixins/pipelines.js

-/* global Flash */
-import '~/flash';
 import Visibility from 'visibilityjs';
+import Flash from '../../flash';
 import Poll from '../../lib/utils/poll';
 import emptyState from '../components/empty_state.vue';
 import errorState from '../components/error_state.vue';

app/assets/javascripts/pipelines/pipeline_details_bundle.js

-/* global Flash */
-
 import Vue from 'vue';
+import Flash from '../flash';
 import PipelinesMediator from './pipeline_details_mediatior';
 import pipelineGraph from './components/graph/graph_component.vue';
 import pipelineHeader from './components/header_component.vue';

app/assets/javascripts/pipelines/pipeline_details_mediatior.js

-/* global Flash */
-
 import Visibility from 'visibilityjs';
+import Flash from '../flash';
 import Poll from '../lib/utils/poll';
 import PipelineStore from './stores/pipeline_store';
 import PipelineService from './services/pipeline_service';

app/assets/javascripts/profile/profile.js

 /* eslint-disable comma-dangle, no-unused-vars, class-methods-use-this, quotes, consistent-return, func-names, prefer-arrow-callback, space-before-function-paren, max-len */
-/* global Flash */
+import Flash from '../flash';
 import { getPagePath } from '../lib/utils/common_utils';
 
 ((global) => {

app/assets/javascripts/protected_branches/protected_branch_edit.js

 /* eslint-disable no-new */
-/* global Flash */
-
+import Flash from '../flash';
 import ProtectedBranchAccessDropdown from './protected_branch_access_dropdown';
 
 export default class ProtectedBranchEdit {
@@ -57,7 +56,7 @@ export default class ProtectedBranchEdit {
         },
       },
       error() {
-        new Flash('Failed to update branch!', null, $('.js-protected-branches-list'));
+        new Flash('Failed to update branch!', 'alert', document.querySelector('.js-protected-branches-list'));
       },
     }).always(() => {
       this.$allowedToMergeDropdown.enable();

app/assets/javascripts/protected_tags/protected_tag_edit.js

 /* eslint-disable no-new */
-/* global Flash */
-
+import Flash from '../flash';
 import ProtectedTagAccessDropdown from './protected_tag_access_dropdown';
 
 export default class ProtectedTagEdit {
@@ -43,7 +42,7 @@ export default class ProtectedTagEdit {
         },
       },
       error() {
-        new Flash('Failed to update tag!', null, $('.js-protected-tags-list'));
+        new Flash('Failed to update tag!', 'alert', document.querySelector('.js-protected-tags-list'));
       },
     }).always(() => {
       this.$allowedToCreateDropdownButton.enable();

app/assets/javascripts/repo/components/repo_commit_section.vue

 <script>
-/* global Flash */
+import Flash from '../../flash';
 import Store from '../stores/repo_store';
 import RepoMixin from '../mixins/repo_mixin';
 import Service from '../services/repo_service';

app/assets/javascripts/repo/helpers/repo_helper.js

-/* global Flash */
 import Service from '../services/repo_service';
 import Store from '../stores/repo_store';
-import '../../flash';
+import Flash from '../../flash';
 
 const RepoHelper = {
   monacoInstance: null,

app/assets/javascripts/repo/services/repo_service.js

-/* global Flash */
 import axios from 'axios';
+import Flash from '../../flash';
 import Store from '../stores/repo_store';
 import Api from '../../api';
 import Helper from '../helpers/repo_helper';
@@ -72,9 +72,9 @@ const RepoService = {
 
   commitFlash(data) {
     if (data.short_id && data.stats) {
-      window.Flash(`Your changes have been committed. Commit ${data.short_id} with ${data.stats.additions} additions, ${data.stats.deletions} deletions.`, 'notice');
+      Flash(`Your changes have been committed. Commit ${data.short_id} with ${data.stats.additions} additions, ${data.stats.deletions} deletions.`, 'notice');
     } else {
-      window.Flash(data.message);
+      Flash(data.message);
     }
   },
 };

app/assets/javascripts/search.js

 /* eslint-disable func-names, space-before-function-paren, wrap-iife, no-var, one-var, one-var-declaration-per-line, object-shorthand, prefer-arrow-callback, comma-dangle, prefer-template, quotes, no-else-return, max-len */
-/* global Flash */
+import Flash from './flash';
 import Api from './api';
 
 (function() {

app/assets/javascripts/sidebar/components/assignees/sidebar_assignees.js

-/* global Flash */
-
+import Flash from '../../../flash';
 import AssigneeTitle from './assignee_title';
 import Assignees from './assignees';
 

app/assets/javascripts/sidebar/components/confidential/confidential_issue_sidebar.vue

 <script>
-/* global Flash */
+import Flash from '../../../flash';
 import editForm from './edit_form.vue';
 
 export default {

app/assets/javascripts/sidebar/lib/sidebar_move_issue.js

-/* global Flash */
+import Flash from '../../flash';
 
 function isValidProjectId(id) {
   return id > 0;

app/assets/javascripts/sidebar/sidebar_mediator.js

-/* global Flash */
-
+import Flash from '../flash';
 import Service from './services/sidebar_service';
 import Store from './stores/sidebar_store';
 

app/assets/javascripts/star.js

 /* eslint-disable func-names, space-before-function-paren, wrap-iife, no-unused-vars, one-var, no-var, one-var-declaration-per-line, prefer-arrow-callback, no-new, max-len */
-/* global Flash */
-
+import Flash from './flash';
 import { __, s__ } from './locale';
 
 export default class Star {

app/assets/javascripts/task_list.js

-/* global Flash */
-
 import 'deckar01-task_list';
+import Flash from './flash';
 
 export default class TaskList {
   constructor(options = {}) {

app/assets/javascripts/vue_merge_request_widget/components/mr_widget_deployment.js

-/* global Flash */
-
 import '~/lib/utils/datetime_utility';
+import Flash from '../../flash';
 import MemoryUsage from './mr_widget_memory_usage';
 import StatusIcon from './mr_widget_status_icon';
 import MRWidgetService from '../services/mr_widget_service';

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_merge_when_pipeline_succeeds.js

-/* global Flash */
+import Flash from '../../../flash';
 import statusIcon from '../mr_widget_status_icon';
 import MRWidgetAuthor from '../../components/mr_widget_author';
 import eventHub from '../../event_hub';

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_merged.js

-/* global Flash */
-
+import Flash from '../../../flash';
 import mrWidgetAuthorTime from '../../components/mr_widget_author_time';
 import tooltip from '../../../vue_shared/directives/tooltip';
 import loadingIcon from '../../../vue_shared/components/loading_icon.vue';

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_ready_to_merge.js

-/* global Flash */
 import successSvg from 'icons/_icon_status_success.svg';
 import warningSvg from 'icons/_icon_status_warning.svg';
 import simplePoll from '~/lib/utils/simple_poll';
+import Flash from '../../../flash';
 import statusIcon from '../mr_widget_status_icon';
 import eventHub from '../../event_hub';
 

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_wip.js

-/* global Flash */
+import Flash from '../../../flash';
 import statusIcon from '../mr_widget_status_icon';
 import tooltip from '../../../vue_shared/directives/tooltip';
 import eventHub from '../../event_hub';

app/assets/javascripts/vue_merge_request_widget/mr_widget_options.js

-/* global Flash */
-
+import Flash from '../flash';
 import {
   WidgetHeader,
   WidgetMergeHelp,

app/assets/javascripts/vue_shared/components/markdown/field.vue

 <script>
-  /* global Flash */
+  import Flash from '../../../flash';
   import markdownHeader from './header.vue';
   import markdownToolbar from './toolbar.vue';