Remove sidebar bundle webpack entry point

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

 import initIssuableSidebar from '~/init_issuable_sidebar';
+import initSidebarBundle from '~/sidebar/sidebar_bundle';
 import Issue from '~/issue';
 import ShortcutsIssuable from '~/shortcuts_issuable';
 import ZenMode from '~/zen_mode';
@@ -10,4 +11,5 @@ document.addEventListener('DOMContentLoaded', () => {
   new ShortcutsIssuable(); // eslint-disable-line no-new
   new ZenMode(); // eslint-disable-line no-new
   initIssuableSidebar();
+  initSidebarBundle();
 });

app/assets/javascripts/pages/projects/merge_requests/conflicts/index.js

+import initSidebarBundle from '~/sidebar/sidebar_bundle';
+
+document.addEventListener('DOMContentLoaded', initSidebarBundle);

app/assets/javascripts/pages/projects/merge_requests/conflicts/show/index.js

+import initSidebarBundle from '~/sidebar/sidebar_bundle';
+
+document.addEventListener('DOMContentLoaded', initSidebarBundle);

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

@@ -3,6 +3,7 @@ import ZenMode from '~/zen_mode';
 import initNotes from '~/init_notes';
 import initIssuableSidebar from '~/init_issuable_sidebar';
 import initDiffNotes from '~/diff_notes/diff_notes_bundle';
+import initSidebarBundle from '~/sidebar/sidebar_bundle';
 import ShortcutsIssuable from '~/shortcuts_issuable';
 import Diff from '~/diff';
 import { handleLocationHash } from '~/lib/utils/common_utils';
@@ -13,6 +14,7 @@ document.addEventListener('DOMContentLoaded', () => {
   new ZenMode(); // eslint-disable-line no-new
 
   initIssuableSidebar();
+  initSidebarBundle();
   initNotes();
   initDiffNotes();
 

app/assets/javascripts/sidebar/sidebar_bundle.js

 import Mediator from './sidebar_mediator';
 import { mountSidebar, getSidebarOptions } from './mount_sidebar';
 
-function domContentLoaded() {
+export default () => {
   const mediator = new Mediator(getSidebarOptions());
   mediator.fetch();
 
   mountSidebar(mediator);
-}
-
-document.addEventListener('DOMContentLoaded', domContentLoaded);
-
-export default domContentLoaded;
+};

app/views/shared/issuable/_sidebar.html.haml

 - todo = issuable_todo(issuable)
 - content_for :page_specific_javascripts do
   = webpack_bundle_tag('common_vue')
-  = webpack_bundle_tag('sidebar')
 
 %aside.right-sidebar.js-right-sidebar.js-issuable-sidebar{ data: { signed: { in: current_user.present? } }, class: sidebar_gutter_collapsed_class, 'aria-live' => 'polite' }
   .issuable-sidebar{ data: { endpoint: "#{issuable_json_path(issuable)}" } }

config/webpack.config.js

@@ -72,7 +72,6 @@ var config = {
     protected_branches:   './protected_branches',
     protected_tags:       './protected_tags',
     registry_list:        './registry/index.js',
-    sidebar:              './sidebar/sidebar_bundle.js',
     snippet:              './snippet/snippet_bundle.js',
     sketch_viewer:        './blob/sketch_viewer.js',
     stl_viewer:           './blob/stl_viewer.js',