Valtio makes proxy-state simple for React and vanilla JavaScript. It provides a minimal, flexible, and unopinionated API that turns objects into self-aware proxies, enabling fine-grained subscription and reactivity. Valtio shines at render optimization in React and is compatible with Suspense and React 18+.
The skill is based on Valtio v2.3.0, generated at 2026-01-29.
Core References
| Topic | Description | Reference |
|---|---|---|
| Proxy | Create reactive state objects that track changes | core-proxy |
| useSnapshot | React hook for render-optimized state access | core-use-snapshot |
| Snapshot | Create immutable snapshots for comparison and Suspense | core-snapshot |
| Subscribe | Subscribe to state changes from anywhere | core-subscribe |
Utils
| Topic | Description | Reference |
|---|---|---|
| proxyMap | Observable Map-like proxy for Map data structures | utils-proxy-map |
| proxySet | Observable Set-like proxy for Set data structures | utils-proxy-set |
| subscribeKey | Subscribe to changes of a specific property | utils-subscribe-key |
| DevTools | Redux DevTools Extension integration | utils-devtools |
| Ref | Create unproxied references for special objects | utils-ref |
Guides
| Topic | Description | Reference |
|---|---|---|
| Component State | Isolate component state using useRef | guides-component-state |
| Computed Properties | Create computed properties with getters and setters | guides-computed-properties |
| Async | Work with promises and React Suspense | guides-async |
Best Practices
| Topic | Description | Reference |
|---|---|---|
| Actions | Organize actions for mutating state | best-practices-actions |
| Persistence | Persist state to localStorage or other storage | best-practices-persistence |
| State Composition | Split and compose states for organization | best-practices-state-composition |