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Advanced
Optimistic Updates + Server Confirmation
When you add a todo, it appears instantly in amber as an 'optimistic' entry. Once the server confirms it via SSE, the item transitions to a green 'confirmed' state before settling into the list.
What to watch for
- ▶Add a todo — it appears instantly in amber (optimistic)
- ▶Within ~500ms the item turns green (server confirmed via SSE)
- ▶The confirmed badge fades after 1.5 seconds
- ▶On error, the optimistic entry disappears (rolled back)
Add todo
Two-phase lifecycle
Phase 1 — Optimistic
Item appears immediately in the UI. Rendered from local state — no server round-trip yet.
Phase 2 — Confirmed
Server mutation succeeds. SSE event triggers a query refetch. The real item replaces the optimistic placeholder.
Error — Rollback
If the mutation fails, the optimistic entry is removed and the cache is restored.