feat(events,session): add React-friendly subscribe APIs and snapshot getters

Adds backwards-compatible primitives needed to consume the renderer from
React 19 hooks (useSyncExternalStore, use(), TanStack Query) without
re-architecting the event bus.

- EventDispatcher.subscribe(type, cb): () => void — unsubscriber-returning
  wrapper matching the useSyncExternalStore subscribe signature.
- CommunicationManager.subscribeMessage(eventCtor, handler): () => void —
  packet-stream equivalent.
- SessionDataManager.getUserDataSnapshot() and
  RoomSessionManager.getActiveRoomSessionSnapshot() — referentially-stable
  read-only views invalidated through new SESSION_DATA_UPDATED and
  ROOM_SESSION_UPDATED events.

All additive; existing addEventListener/removeEventListener / IRoomSession
APIs are unchanged. Bumps renderer to 2.1.0.

packages/api/src/common/IEventDispatcher.ts

@@ -7,4 +7,5 @@ export interface IEventDispatcher
     removeEventListener(type: string, callback: Function): void;
     removeAllListeners(): void;
     dispatchEvent<T extends INitroEvent>(event: T): boolean;
+    subscribe<T extends INitroEvent>(type: string | string[], callback: (event: T) => void): () => void;
 }

packages/api/src/communication/ICommunicationManager.ts

@@ -6,5 +6,6 @@ export interface ICommunicationManager
     init(): Promise<void>;
     registerMessageEvent(event: IMessageEvent): IMessageEvent;
     removeMessageEvent(event: IMessageEvent): void;
+    subscribeMessage<T extends IMessageEvent>(eventCtor: new (callback: (event: T) => void) => T, handler: (event: T) => void): () => void;
     connection: IConnection;
 }

packages/api/src/nitro/session/IRoomSessionManager.ts

@@ -1,4 +1,5 @@
 import { IRoomSession } from './IRoomSession';
+import { IRoomSessionSnapshot } from './IRoomSessionSnapshot';
 
 export interface IRoomSessionManager
 {
@@ -8,5 +9,6 @@ export interface IRoomSessionManager
     startSession(session: IRoomSession): boolean;
     removeSession(id: number, openLandingView?: boolean): void;
     tryRestoreSession(): boolean;
+    getActiveRoomSessionSnapshot(): Readonly<IRoomSessionSnapshot> | null;
     viewerSession: IRoomSession;
 }

packages/api/src/nitro/session/IRoomSessionSnapshot.ts

@@ -0,0 +1,18 @@
+import { IRoomSession } from './IRoomSession';
+
+export interface IRoomSessionSnapshot
+{
+    roomId: number;
+    state: string;
+    isRoomOwner: boolean;
+    isSpectator: boolean;
+    isDecorating: boolean;
+    isGuildRoom: boolean;
+    isPrivateRoom: boolean;
+    controllerLevel: number;
+    doorMode: number;
+    tradeMode: number;
+    allowPets: boolean;
+    groupId: number;
+    session: IRoomSession;
+}

packages/api/src/nitro/session/ISessionDataManager.ts

@@ -3,6 +3,7 @@ import { IFurnitureData } from './IFurnitureData';
 import { IGroupInformationManager } from './IGroupInformationManager';
 import { IIgnoredUsersManager } from './IIgnoredUsersManager';
 import { IProductData } from './IProductData';
+import { IUserDataSnapshot } from './IUserDataSnapshot';
 
 export interface ISessionDataManager
 {
@@ -53,4 +54,5 @@ export interface ISessionDataManager
     isCameraFollowDisabled: boolean;
     uiFlags: number;
     tags: string[];
+    getUserDataSnapshot(): Readonly<IUserDataSnapshot>;
 }

packages/api/src/nitro/session/IUserDataSnapshot.ts

@@ -0,0 +1,22 @@
+export interface IUserDataSnapshot
+{
+    userId: number;
+    userName: string;
+    figure: string;
+    gender: string;
+    realName: string;
+    respectsReceived: number;
+    respectsLeft: number;
+    respectsPetLeft: number;
+    canChangeName: boolean;
+    clubLevel: number;
+    securityLevel: number;
+    isAmbassador: boolean;
+    isEmailVerified: boolean;
+    isNoob: boolean;
+    isAuthenticHabbo: boolean;
+    isSystemOpen: boolean;
+    isSystemShutdown: boolean;
+    uiFlags: number;
+    tags: ReadonlyArray<string>;
+}

packages/api/src/nitro/session/index.ts

@@ -18,6 +18,8 @@ export * from './IRoomSessionManager';
 export * from './IRoomUserData';
 export * from './ISessionDataManager';
 export * from './IUserDataManager';
+export * from './IUserDataSnapshot';
+export * from './IRoomSessionSnapshot';
 export * from './PetBreedingResultData';
 export * from './PetCustomPart';
 export * from './PetFigureData';

packages/communication/src/CommunicationManager.ts

@@ -203,6 +203,17 @@ export class CommunicationManager implements ICommunicationManager
         this._connection.removeMessageEvent(event);
     }
 
+    public subscribeMessage<T extends IMessageEvent>(eventCtor: new (callback: (event: T) => void) => T, handler: (event: T) => void): () => void
+    {
+        if(!eventCtor || !handler) return () => {};
+
+        const event = new eventCtor(handler);
+
+        this.registerMessageEvent(event);
+
+        return () => this.removeMessageEvent(event);
+    }
+
     public get connection(): IConnection
     {
         return this._connection;

packages/events/src/EventDispatcher.ts

@@ -101,4 +101,23 @@ export class EventDispatcher implements IEventDispatcher
     {
         this._listeners.clear();
     }
+
+    public subscribe<T extends INitroEvent>(type: string | string[], callback: (event: T) => void): () => void
+    {
+        if(!type || !callback) return () => {};
+
+        if(Array.isArray(type))
+        {
+            for(const t of type) this.addEventListener<T>(t, callback);
+
+            return () =>
+            {
+                for(const t of type) this.removeEventListener(t, callback);
+            };
+        }
+
+        this.addEventListener<T>(type, callback);
+
+        return () => this.removeEventListener(type, callback);
+    }
 }

packages/events/src/NitroEventType.ts

@@ -17,4 +17,6 @@ export class NitroEventType
     public static readonly AVATAR_EFFECT_DOWNLOADED = 'AVATAR_EFFECT_DOWNLOADED';
     public static readonly AVATAR_EFFECT_LOADED = 'AVATAR_EFFECT_LOADED';
     public static readonly FURNITURE_DATA_LOADED = 'FURNITURE_DATA_LOADED';
+    public static readonly SESSION_DATA_UPDATED = 'SESSION_DATA_UPDATED';
+    public static readonly ROOM_SESSION_UPDATED = 'ROOM_SESSION_UPDATED';
 }

packages/session/src/RoomSessionManager.ts

@@ -1,6 +1,6 @@
-import { IRoomHandlerListener, IRoomSession, IRoomSessionManager } from '@nitrots/api';
+import { IRoomHandlerListener, IRoomSession, IRoomSessionManager, IRoomSessionSnapshot } from '@nitrots/api';
 import { GetCommunication, RoomEnterComposer, RoomUnitWalkComposer } from '@nitrots/communication';
-import { GetEventDispatcher, NitroEventType, RoomSessionEvent } from '@nitrots/events';
+import { GetEventDispatcher, NitroEvent, NitroEventType, RoomSessionEvent } from '@nitrots/events';
 import { NitroLogger } from '@nitrots/utils';
 import { RoomSession } from './RoomSession';
 import { BaseHandler, GenericErrorHandler, PetPackageHandler, PollHandler, RoomChatHandler, RoomDataHandler, RoomDimmerPresetsHandler, RoomPermissionsHandler, RoomPresentHandler, RoomSessionHandler, RoomUsersHandler, WordQuizHandler } from './handler';
@@ -26,6 +26,41 @@ export class RoomSessionManager implements IRoomSessionManager, IRoomHandlerList
     private _pendingRoomClear: ReturnType<typeof setTimeout> = null;
     private _savedPosX: number = -1;
     private _savedPosY: number = -1;
+    private _activeRoomSessionSnapshot: Readonly<IRoomSessionSnapshot> | null = null;
+
+    private invalidateRoomSessionSnapshot(): void
+    {
+        this._activeRoomSessionSnapshot = null;
+
+        GetEventDispatcher().dispatchEvent(new NitroEvent(NitroEventType.ROOM_SESSION_UPDATED));
+    }
+
+    public getActiveRoomSessionSnapshot(): Readonly<IRoomSessionSnapshot> | null
+    {
+        const session = this._viewerSession;
+
+        if(!session) return null;
+
+        if(this._activeRoomSessionSnapshot && this._activeRoomSessionSnapshot.session === session) return this._activeRoomSessionSnapshot;
+
+        this._activeRoomSessionSnapshot = Object.freeze<IRoomSessionSnapshot>({
+            roomId: session.roomId,
+            state: session.state,
+            isRoomOwner: session.isRoomOwner,
+            isSpectator: session.isSpectator,
+            isDecorating: session.isDecorating,
+            isGuildRoom: session.isGuildRoom,
+            isPrivateRoom: session.isPrivateRoom,
+            controllerLevel: session.controllerLevel,
+            doorMode: session.doorMode,
+            tradeMode: session.tradeMode,
+            allowPets: session.allowPets,
+            groupId: session.groupId,
+            session
+        });
+
+        return this._activeRoomSessionSnapshot;
+    }
 
     public async init(): Promise<void>
     {
@@ -196,6 +231,7 @@ export class RoomSessionManager implements IRoomSessionManager, IRoomHandlerList
 
         this._sessions.clear();
         this._viewerSession = null;
+        this.invalidateRoomSessionSnapshot();
         this.createSession(roomId, password, this._savedPosX, this._savedPosY);
         this.clearGuardTimer();
         this._reconnectGuardTimer = setTimeout(() =>
@@ -384,6 +420,8 @@ export class RoomSessionManager implements IRoomSessionManager, IRoomHandlerList
         this._lastRoomPassword = roomSession.password;
         this.persistRoom(roomSession.roomId, roomSession.password);
 
+        this.invalidateRoomSessionSnapshot();
+
         this.startSession(this._viewerSession);
 
         return true;
@@ -406,6 +444,8 @@ export class RoomSessionManager implements IRoomSessionManager, IRoomHandlerList
 
         this.setHandlers(session);
 
+        this.invalidateRoomSessionSnapshot();
+
         return true;
     }
 
@@ -429,6 +469,10 @@ export class RoomSessionManager implements IRoomSessionManager, IRoomHandlerList
         }
 
         GetEventDispatcher().dispatchEvent(new RoomSessionEvent(RoomSessionEvent.ENDED, session, openLandingView));
+
+        if(this._viewerSession === session) this._viewerSession = null;
+
+        this.invalidateRoomSessionSnapshot();
     }
 
     public sessionUpdate(id: number, type: string): void

packages/session/src/SessionDataManager.ts

@@ -1,8 +1,8 @@
-import { IFurnitureData, IGroupInformationManager, IMessageComposer, IMessageEvent, IProductData, ISessionDataManager, NoobnessLevelEnum, SecurityLevel } from '@nitrots/api';
+import { IFurnitureData, IGroupInformationManager, IMessageComposer, IMessageEvent, IProductData, ISessionDataManager, IUserDataSnapshot, NoobnessLevelEnum, SecurityLevel } from '@nitrots/api';
 import { AccountSafetyLockStatusChangeMessageEvent, AccountSafetyLockStatusChangeParser, AvailabilityStatusMessageEvent, ChangeUserNameResultMessageEvent, EmailStatusResultEvent, FigureUpdateEvent, GetCommunication, GetUserTagsComposer, InClientLinkEvent, MysteryBoxKeysEvent, NoobnessLevelMessageEvent, PetRespectComposer, PetScratchFailedMessageEvent, RoomReadyMessageEvent, RoomUnitChatComposer, UserInfoEvent, UserNameChangeMessageEvent, UserPermissionsEvent, UserRespectComposer, UserTagsMessageEvent } from '@nitrots/communication';
 import { GetConfiguration } from '@nitrots/configuration';
 import { GetLocalizationManager } from '@nitrots/localization';
-import { GetEventDispatcher, MysteryBoxKeysUpdateEvent, NitroSettingsEvent, SessionDataPreferencesEvent, UserNameUpdateEvent } from '@nitrots/events';
+import { GetEventDispatcher, MysteryBoxKeysUpdateEvent, NitroEvent, NitroEventType, NitroSettingsEvent, SessionDataPreferencesEvent, UserNameUpdateEvent } from '@nitrots/events';
 import { CreateLinkEvent, HabboWebTools } from '@nitrots/utils';
 import { Texture } from 'pixi.js';
 import { GroupInformationManager } from './GroupInformationManager';
@@ -52,11 +52,49 @@ export class SessionDataManager implements ISessionDataManager
 
     private _badgeImageManager: BadgeImageManager = new BadgeImageManager();
 
+    private _userDataSnapshot: Readonly<IUserDataSnapshot> | null = null;
+
     constructor()
     {
         this.resetUserInfo();
     }
 
+    private invalidateUserDataSnapshot(): void
+    {
+        this._userDataSnapshot = null;
+
+        GetEventDispatcher().dispatchEvent(new NitroEvent(NitroEventType.SESSION_DATA_UPDATED));
+    }
+
+    public getUserDataSnapshot(): Readonly<IUserDataSnapshot>
+    {
+        if(this._userDataSnapshot) return this._userDataSnapshot;
+
+        this._userDataSnapshot = Object.freeze<IUserDataSnapshot>({
+            userId: this._userId,
+            userName: this._name,
+            figure: this._figure,
+            gender: this._gender,
+            realName: this._realName,
+            respectsReceived: this._respectsReceived,
+            respectsLeft: this._respectsLeft,
+            respectsPetLeft: this._respectsPetLeft,
+            canChangeName: this._canChangeName,
+            clubLevel: this._clubLevel,
+            securityLevel: this._securityLevel,
+            isAmbassador: this._isAmbassador,
+            isEmailVerified: this._isEmailVerified,
+            isNoob: (this._noobnessLevel !== NoobnessLevelEnum.OLD_IDENTITY),
+            isAuthenticHabbo: this._isAuthenticHabbo,
+            isSystemOpen: this._systemOpen,
+            isSystemShutdown: this._systemShutdown,
+            uiFlags: this._uiFlags,
+            tags: Object.freeze<string[]>([...this._tags]) as ReadonlyArray<string>
+        });
+
+        return this._userDataSnapshot;
+    }
+
     public async init(): Promise<void>
     {
         await Promise.all([
@@ -75,6 +113,8 @@ export class SessionDataManager implements ISessionDataManager
                 this._gender = event.getParser().gender;
 
                 HabboWebTools.updateFigure(this._figure);
+
+                this.invalidateUserDataSnapshot();
             })),
             GetCommunication().registerMessageEvent(new UserInfoEvent(this.onUserInfoEvent.bind(this))),
             GetCommunication().registerMessageEvent(new UserPermissionsEvent(this.onUserPermissionsEvent.bind(this))),
@@ -98,6 +138,8 @@ export class SessionDataManager implements ISessionDataManager
             this._uiFlags = event.flags;
 
             GetEventDispatcher().dispatchEvent(new SessionDataPreferencesEvent(this._uiFlags));
+
+            this.invalidateUserDataSnapshot();
         };
 
         GetEventDispatcher().addEventListener<NitroSettingsEvent>(NitroSettingsEvent.SETTINGS_UPDATED, this._settingsEventCallback);
@@ -189,6 +231,8 @@ export class SessionDataManager implements ISessionDataManager
         this._safetyLocked = userInfo.safetyLocked;
 
         this._ignoredUsersManager.requestIgnoredUsers(userInfo.username);
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onUserPermissionsEvent(event: UserPermissionsEvent): void
@@ -198,6 +242,8 @@ export class SessionDataManager implements ISessionDataManager
         this._clubLevel = event.getParser().clubLevel;
         this._securityLevel = event.getParser().securityLevel;
         this._isAmbassador = event.getParser().isAmbassador;
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onAvailabilityStatusMessageEvent(event: AvailabilityStatusMessageEvent): void
@@ -211,6 +257,8 @@ export class SessionDataManager implements ISessionDataManager
         this._systemOpen = parser.isOpen;
         this._systemShutdown = parser.onShutdown;
         this._isAuthenticHabbo = parser.isAuthenticUser;
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onPetRespectFailed(event: PetScratchFailedMessageEvent): void
@@ -218,6 +266,8 @@ export class SessionDataManager implements ISessionDataManager
         if(!event || !event.connection) return;
 
         this._respectsPetLeft++;
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onChangeNameUpdateEvent(event: ChangeUserNameResultMessageEvent): void
@@ -233,6 +283,8 @@ export class SessionDataManager implements ISessionDataManager
         this._canChangeName = false;
 
         GetEventDispatcher().dispatchEvent(new UserNameUpdateEvent(parser.name));
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onUserNameChangeMessageEvent(event: UserNameChangeMessageEvent): void
@@ -249,6 +301,8 @@ export class SessionDataManager implements ISessionDataManager
         this._canChangeName = false;
 
         GetEventDispatcher().dispatchEvent(new UserNameUpdateEvent(this._name));
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onUserTags(event: UserTagsMessageEvent): void
@@ -260,6 +314,8 @@ export class SessionDataManager implements ISessionDataManager
         if(!parser) return;
 
         this._tags = parser.tags;
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onRoomModelNameEvent(event: RoomReadyMessageEvent): void
@@ -300,6 +356,8 @@ export class SessionDataManager implements ISessionDataManager
         this._noobnessLevel = event.getParser().noobnessLevel;
 
         if(this._noobnessLevel !== NoobnessLevelEnum.OLD_IDENTITY) GetConfiguration().setValue<number>('new.identity', 1);
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onAccountSafetyLockStatusChangeMessageEvent(event: AccountSafetyLockStatusChangeMessageEvent): void
@@ -316,6 +374,8 @@ export class SessionDataManager implements ISessionDataManager
     private onEmailStatus(event: EmailStatusResultEvent): void
     {
         this._isEmailVerified = event?.getParser()?.isVerified ?? false;
+
+        this.invalidateUserDataSnapshot();
     }
 
     public getFloorItemData(id: number): IFurnitureData
@@ -476,6 +536,8 @@ export class SessionDataManager implements ISessionDataManager
         this.send(new UserRespectComposer(userId));
 
         this._respectsLeft--;
+
+        this.invalidateUserDataSnapshot();
     }
 
     public givePetRespect(petId: number): void
@@ -485,6 +547,8 @@ export class SessionDataManager implements ISessionDataManager
         this.send(new PetRespectComposer(petId));
 
         this._respectsPetLeft--;
+
+        this.invalidateUserDataSnapshot();
     }
 
     public sendSpecialCommandMessage(text: string, styleId: number = 0): void