Improve quality of Typescript types (#10742)

src/models/LocalRoom.ts

@@ -35,7 +35,7 @@ export class LocalRoom extends Room {
     /** Whether the actual room should be encrypted. */
     public encrypted = false;
     /** If the actual room has been created, this holds its ID. */
-    public actualRoomId: string;
+    public actualRoomId?: string;
     /** DM chat partner */
     public targets: Member[] = [];
     /** Callbacks that should be invoked after the actual room has been created. */

src/models/RoomUpload.ts

@@ -20,7 +20,7 @@ import { IEncryptedFile } from "../customisations/models/IMediaEventContent";
 
 export class RoomUpload {
     public readonly abortController = new AbortController();
-    public promise: Promise<{ url?: string; file?: IEncryptedFile }>;
+    public promise?: Promise<{ url?: string; file?: IEncryptedFile }>;
     private uploaded = 0;
 
     public constructor(