Not require Websocket type definition imports

types/api/websocket.d.ts

@@ -1,14 +1,14 @@
 // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.
 
-export type WebsocketBroadcast = {
+type WebsocketBroadcast = {
     omit_users: Dictionary<boolean>;
     user_id: string;
     channel_id: string;
     team_id: string;
 }
 
-export type WebSocketMessage = {
+type WebSocketMessage = {
     event: string;
     data: any;
     broadcast: WebsocketBroadcast;