Expose components needed for the ai plugin new interface (#24972)

* Export thread components

* Exporting AdvancedCreateComment

* Expose components needed for the ai plugin new interface

* Exporting the placeholder for the plugin CreatePost component, and simplify the export

* Fixing linter errors

* Fixing type errors

* Reverting typescript related changes

* Cheating typescript to keep the changes as minimal as possible

* Fix linter errors

webapp/channels/src/plugins/export.js

@@ -12,6 +12,7 @@ import {openPricingModal} from 'components/global_header/right_controls/plan_upg
 import {useNotifyAdmin} from 'components/notify_admin_cta/notify_admin_cta';
 import PurchaseModal from 'components/purchase_modal';
 import StartTrialFormModal from 'components/start_trial_form_modal';
+import ThreadViewer from 'components/threading/thread_viewer';
 import Timestamp from 'components/timestamp';
 import BotTag from 'components/widgets/tag/bot_tag';
 import Avatar from 'components/widgets/users/avatar';
@@ -24,6 +25,7 @@ import {formatText} from 'utils/text_formatting';
 import {useWebSocket, useWebSocketClient, WebSocketContext} from 'utils/use_websocket';
 import {imageURLForUser} from 'utils/utils';
 
+import CreatePost from './exported_create_post';
 import {openInteractiveDialog} from './interactive_dialog'; // This import has intentional side effects. Do not remove without research.
 import Textbox from './textbox';
 
@@ -86,6 +88,8 @@ window.Components = {
     imageURLForUser,
     BotBadge: BotTag,
     StartTrialFormModal,
+    ThreadViewer,
+    CreatePost,
 };
 
 // This is a prototype of the Product API for use by internal plugins only while we transition to the proper architecture

webapp/channels/src/plugins/exported_create_post.tsx

@@ -0,0 +1,35 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+
+import AdvancedCreateComment from 'components/advanced_create_comment';
+
+import type {PostDraft} from 'types/store/draft';
+
+type Props = {
+    placeholder?: string;
+    onSubmit: (draft: PostDraft) => void;
+}
+
+const ExportedCreatePost = ({placeholder, onSubmit}: Props) => {
+    const Component = AdvancedCreateComment as any;
+
+    return (
+        <Component
+            placeholder={placeholder}
+            rootDeleted={false}
+            channelId={undefined}
+            rootId={undefined}
+            latestPostId={undefined}
+            onSubmit={onSubmit}
+            onUpdateCommentDraft={() => null}
+            updateCommentDraftWithRootId={() => null}
+            onMoveHistoryIndexBack={() => null}
+            onMoveHistoryIndexForward={() => null}
+            onEditLatestPost={() => ({data: true})}
+        />
+    );
+};
+
+export default ExportedCreatePost;