From 7a0f7d06447a1f7bc8f4583d91ec7e4e40b70989 Mon Sep 17 00:00:00 2001
From: Mikhail Shustov <restrry@gmail.com>
Date: Fri, 3 Apr 2020 15:26:55 +0200
Subject: [PATCH] tranform management section lazy loading (#62408) (#62423)

---
 .../public/app/mount_management_section.ts    | 52 +++++++++++++++++++
 x-pack/plugins/transform/public/plugin.ts     | 41 ++-------------
 2 files changed, 55 insertions(+), 38 deletions(-)
 create mode 100644 x-pack/plugins/transform/public/app/mount_management_section.ts

diff --git a/x-pack/plugins/transform/public/app/mount_management_section.ts b/x-pack/plugins/transform/public/app/mount_management_section.ts
new file mode 100644
index 0000000000000..f3a48975a68e6
--- /dev/null
+++ b/x-pack/plugins/transform/public/app/mount_management_section.ts
@@ -0,0 +1,52 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+import { CoreSetup } from 'src/core/public';
+import { ManagementAppMountParams } from '../../../../../src/plugins/management/public/';
+import { Storage } from '../../../../../src/plugins/kibana_utils/public';
+
+import { PluginsDependencies } from '../plugin';
+
+import { AppDependencies } from './app_dependencies';
+import { breadcrumbService } from './services/navigation';
+import { docTitleService } from './services/navigation';
+import { textService } from './services/text';
+import { renderApp } from './app';
+
+const localStorage = new Storage(window.localStorage);
+
+export async function mountManagementSection(
+  coreSetup: CoreSetup<PluginsDependencies>,
+  params: ManagementAppMountParams
+) {
+  const { element, setBreadcrumbs } = params;
+  const { http, notifications, getStartServices } = coreSetup;
+  const startServices = await getStartServices();
+  const [core, plugins] = startServices;
+  const { chrome, docLinks, i18n, overlays, savedObjects, uiSettings } = core;
+  const { data } = plugins;
+  const { docTitle } = chrome;
+
+  // Initialize services
+  textService.init();
+  docTitleService.init(docTitle.change);
+  breadcrumbService.setup(setBreadcrumbs);
+
+  // AppCore/AppPlugins to be passed on as React context
+  const appDependencies: AppDependencies = {
+    chrome,
+    data,
+    docLinks,
+    http,
+    i18n,
+    notifications,
+    overlays,
+    savedObjects,
+    storage: localStorage,
+    uiSettings,
+  };
+
+  return renderApp(element, appDependencies);
+}
diff --git a/x-pack/plugins/transform/public/plugin.ts b/x-pack/plugins/transform/public/plugin.ts
index 9a83f5b0e05f3..cfe84a5ab693d 100644
--- a/x-pack/plugins/transform/public/plugin.ts
+++ b/x-pack/plugins/transform/public/plugin.ts
@@ -9,16 +9,6 @@ import { CoreSetup } from 'src/core/public';
 import { DataPublicPluginStart } from 'src/plugins/data/public';
 import { ManagementSetup } from 'src/plugins/management/public';
 
-import { Storage } from '../../../../src/plugins/kibana_utils/public';
-
-import { renderApp } from './app/app';
-import { AppDependencies } from './app/app_dependencies';
-import { breadcrumbService } from './app/services/navigation';
-import { docTitleService } from './app/services/navigation';
-import { textService } from './app/services/text';
-
-const localStorage = new Storage(window.localStorage);
-
 export interface PluginsDependencies {
   data: DataPublicPluginStart;
   management: ManagementSetup;
@@ -37,34 +27,9 @@ export class TransformUiPlugin {
           defaultMessage: 'Transforms',
         }),
         order: 3,
-        mount: async ({ element, setBreadcrumbs }) => {
-          const { http, notifications, getStartServices } = coreSetup;
-          const startServices = await getStartServices();
-          const [core, plugins] = startServices;
-          const { chrome, docLinks, i18n, overlays, savedObjects, uiSettings } = core;
-          const { data } = plugins;
-          const { docTitle } = chrome;
-
-          // Initialize services
-          textService.init();
-          docTitleService.init(docTitle.change);
-          breadcrumbService.setup(setBreadcrumbs);
-
-          // AppCore/AppPlugins to be passed on as React context
-          const appDependencies: AppDependencies = {
-            chrome,
-            data,
-            docLinks,
-            http,
-            i18n,
-            notifications,
-            overlays,
-            savedObjects,
-            storage: localStorage,
-            uiSettings,
-          };
-
-          return renderApp(element, appDependencies);
+        mount: async params => {
+          const { mountManagementSection } = await import('./app/mount_management_section');
+          return mountManagementSection(coreSetup, params);
         },
       });
     }