Chat: Make the message in onMessageEntered and user in onTypingStart required (DevExpress#29072)

Co-authored-by: Ruslan Farkhutdinov <[email protected]>

Author: r-farkhutdinov

packages/devextreme/js/ui/chat.d.ts

@@ -52,7 +52,7 @@ export type OptionChangedEvent = EventInfo<dxChat> & ChangedOptionInfo;
  */
 export type MessageEnteredEvent = NativeEventInfo<dxChat, KeyboardEvent | PointerEvent | MouseEvent | TouchEvent> & {
     /** @docid _ui_chat_MessageEnteredEvent.message */
-    readonly message?: Message;
+    readonly message: Message;
 };
 
 /**
@@ -74,7 +74,7 @@ export type TypingStartEvent = NativeEventInfo<dxChat, UIEvent & { target: HTMLI
  */
 export type TypingEndEvent = EventInfo<dxChat> & {
     /** @docid _ui_chat_TypingEndEvent.user */
-    readonly user?: User;
+    readonly user: User;
 };
 
 /**

packages/devextreme/ts/dx.all.d.ts

@@ -9779,7 +9779,7 @@ declare module DevExpress.ui {
         /**
          * [descr:_ui_chat_MessageEnteredEvent.message]
          */
-        readonly message?: Message;
+        readonly message: Message;
       };
     export type MessageTemplateData = {
       readonly component: dxChat;
@@ -9800,7 +9800,7 @@ declare module DevExpress.ui {
         /**
          * [descr:_ui_chat_TypingEndEvent.user]
          */
-        readonly user?: User;
+        readonly user: User;
       };
     /**
      * [descr:_ui_chat_TypingStartEvent]