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utils/socketConnect.ts — singleton Socket.IO client
src/utils/socketConnect.ts
const SOCKET_URL = import.meta.env.VITE_APP_SOCKET_URL;
let socket: Socket | null = null;
const getSocket = (userId: string): Socket => {
if (!socket || !socket.connected) {
return connectSocket(userId);
}
return socket;
};
connectSocket(userId)query: { userId } — backend maps userId → socket.id in userSocketMap for targeted emits (updateUserSettingData).
On connect:
ping intervaldisconnectSocket()JWTContext.logout():
removeAllListeners()disconnect()socket = nullimport { getSocket } from 'utils/socketConnect';
useEffect(() => {
if (!user?._id) return;
const socket = getSocket(user._id);
socket.on('notification', handleNotification);
return () => {
socket.off('notification', handleNotification);
};
}, [user?._id]);
socket.off the same handler reference in cleanup to avoid duplicate listeners on re-render.