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timestamp: number } export function useRealtimeCursors({ roomName, username, throttleMs, }: { roomName: string username: string throttleMs: number }) { const color = generateRandomColor() const userId = generateRandomNumber() const cursors = reactive>({}) const cursorPayload = ref(null) const channelRef = ref(null) const sendCursor = (event: MouseEvent) => { const payload: CursorEventPayload = { position: { x: event.clientX, y: event.clientY, }, user: { id: userId, name: username, }, color, timestamp: Date.now(), } cursorPayload.value = payload channelRef.value?.send({ type: 'broadcast', event: EVENT_NAME, payload, }) } const { run: handleMouseMove, cancel: cancelThrottle } = useThrottleCallback( sendCursor, throttleMs ) onMounted(() => { const channel = supabase.channel(roomName) channel .on('system', {}, (payload: CursorEventPayload) => { console.error('Realtime system error:', payload) // Defensive cleanup Object.keys(cursors).forEach((k) => delete cursors[k]) channelRef.value = null }) .on( 'presence', { event: 'leave' }, ({ leftPresences }: { leftPresences: Array<{ key: string }> }) => { leftPresences.forEach(({ key }) => { delete cursors[key] }) } ) .on('presence', { event: 'join' }, () => { if (!cursorPayload.value) return channelRef.value?.send({ type: 'broadcast', event: EVENT_NAME, payload: cursorPayload.value, }) }) .on('broadcast', { event: EVENT_NAME }, ({ payload }: { payload: CursorEventPayload }) => { if (payload.user.id === userId) return cursors[payload.user.id] = payload }) .subscribe(async (status: REALTIME_SUBSCRIBE_STATES) => { if (status === REALTIME_SUBSCRIBE_STATES.SUBSCRIBED) { try { await channel.track({ key: userId }) channelRef.value = channel } catch (err) { console.error('Failed to track presence for current user:', err) channelRef.value = null } } else { Object.keys(cursors).forEach((k) => delete cursors[k]) channelRef.value = null } }) window.addEventListener('mousemove', handleMouseMove) }) onUnmounted(() => { 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Realtime Cursor For Nuxt And Supabase

Installation

Files

app

Styles