Only load required javascript in Wiki pages

Limit load clone panel in git_access page
Limit various edit applications to the create and edit pages
Only load diff stats dropdown in diff page

app/assets/javascripts/pages/projects/wikis/diff/index.js

+import { initDiffStatsDropdown } from '~/init_diff_stats_dropdown';
+
+initDiffStatsDropdown();

app/assets/javascripts/pages/projects/wikis/edit/index.js

+import { mountApplications } from '~/pages/shared/wikis/edit';
+
+mountApplications();

app/assets/javascripts/pages/projects/wikis/git_access/index.js

+import initClonePanel from '~/clone_panel';
+
+initClonePanel();

app/assets/javascripts/pages/projects/wikis/index.js

-import { initDiffStatsDropdown } from '~/init_diff_stats_dropdown';
-import initWikis from '~/pages/shared/wikis';
+import Wikis from '~/pages/shared/wikis/wikis';
 
-initWikis();
-initDiffStatsDropdown();
+export default new Wikis();

app/assets/javascripts/pages/projects/wikis/show/index.js

+import { mountApplications as mountEditApplications } from '~/pages/shared/wikis/async_edit';
+
+mountEditApplications();

app/assets/javascripts/pages/shared/wikis/async_edit.js

+export const mountApplications = async () => {
+  const el = document.querySelector('.js-wiki-edit-page');
+
+  if (el) {
+    const { mountApplications: mountEditApplications } = await import(
+      /* webpackChunkName: 'wiki_edit' */ './edit'
+    );
+
+    mountEditApplications();
+  }
+};

app/assets/javascripts/pages/shared/wikis/index.js → app/assets/javascripts/pages/shared/wikis/edit.js

 import $ from 'jquery';
 import Vue from 'vue';
-import ShortcutsWiki from '~/behaviors/shortcuts/shortcuts_wiki';
 import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
 import csrf from '~/lib/utils/csrf';
 import Translate from '~/vue_shared/translate';
@@ -9,14 +8,8 @@ import ZenMode from '../../../zen_mode';
 import deleteWikiModal from './components/delete_wiki_modal.vue';
 import wikiAlert from './components/wiki_alert.vue';
 import wikiForm from './components/wiki_form.vue';
-import Wikis from './wikis';
 
 const createModalVueApp = () => {
-  new Wikis(); // eslint-disable-line no-new
-  new ShortcutsWiki(); // eslint-disable-line no-new
-  new ZenMode(); // eslint-disable-line no-new
-  new GLForm($('.wiki-form')); // eslint-disable-line no-new
-
   const deleteWikiModalWrapperEl = document.getElementById('delete-wiki-modal-wrapper');
 
   if (deleteWikiModalWrapperEl) {
@@ -85,7 +78,10 @@ const createWikiFormApp = () => {
   }
 };
 
-export default () => {
+export const mountApplications = () => {
+  new ZenMode(); // eslint-disable-line no-new
+  new GLForm($('.wiki-form')); // eslint-disable-line no-new
+
   createModalVueApp();
   createAlertVueApp();
   createWikiFormApp();

app/assets/javascripts/pages/shared/wikis/wikis.js

 import { GlBreakpointInstance as bp } from '@gitlab/ui/dist/utils';
 import Tracking from '~/tracking';
 import showToast from '~/vue_shared/plugins/global_toast';
+import ShortcutsWiki from '~/behaviors/shortcuts/shortcuts_wiki';
 
 const TRACKING_EVENT_NAME = 'view_wiki_page';
 const TRACKING_CONTEXT_SCHEMA = 'iglu:com.gitlab/wiki_page_context/jsonschema/1-0-1';
@@ -20,6 +21,7 @@ export default class Wikis {
 
     Wikis.trackPageView();
     Wikis.showToasts();
+    Wikis.initShortcuts();
   }
 
   handleToggleSidebar(e) {
@@ -64,4 +66,8 @@ export default class Wikis {
     const toasts = document.querySelectorAll('.js-toast-message');
     toasts.forEach((toast) => showToast(toast.dataset.message));
   }
+
+  static initShortcuts() {
+    new ShortcutsWiki(); // eslint-disable-line no-new
+  }
 }

app/views/shared/wikis/edit.html.haml

@@ -4,7 +4,7 @@
 - if @error
   #js-wiki-error{ data: { error: @error, wiki_page_path: wiki_page_path(@wiki, @page) } }
 
-.wiki-page-header.top-area.has-sidebar-toggle.flex-column.flex-lg-row
+.js-wiki-edit-page.wiki-page-header.top-area.has-sidebar-toggle.flex-column.flex-lg-row
   = wiki_sidebar_toggle_button
 
   %h3.page-title.gl-flex-grow-1

ee/app/assets/javascripts/pages/groups/wikis/diff/index.js

+import { initDiffStatsDropdown } from '~/init_diff_stats_dropdown';
+
+initDiffStatsDropdown();

ee/app/assets/javascripts/pages/groups/wikis/edit/index.js

+import { mountApplications } from '~/pages/shared/wikis/edit';
+
+mountApplications();

ee/app/assets/javascripts/pages/groups/wikis/git_access/index.js

+import initClonePanel from '~/clone_panel';
+
+initClonePanel();

ee/app/assets/javascripts/pages/groups/wikis/index.js

-import initClonePanel from '~/clone_panel';
-import { initDiffStatsDropdown } from '~/init_diff_stats_dropdown';
-import initWikis from '~/pages/shared/wikis';
+import Wikis from '~/pages/shared/wikis/wikis';
 
-initWikis();
-initClonePanel();
-initDiffStatsDropdown();
+export default new Wikis();

ee/app/assets/javascripts/pages/groups/wikis/show/index.js

+import { mountApplications as mountEditApplications } from '~/pages/shared/wikis/async_edit';
+
+mountEditApplications();