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Valtio is a lightweight, proxy-based state management library for JavaScript and TypeScript, designed to simplify reactive state handling in both React and vanilla environments. It allows you to manage mutable state through normal JavaScript objects, while providing React hooks (useSnapshot) and subscription utilities to create optimized component re-renders and state observation. It uses ECMAScript Proxies and supports deep state tracking, making state mutation intuitive and powerful without sacrificing performance or compatibility with React's concurrency model.
Features
- Wraps plain objects into reactive proxies using proxy()
- Provides useSnapshot() hook for read-only snapshots that trigger component re-render only on accessed property changes
- Enables global subscriptions via subscribe() or subscribeKey() to monitor specific state changes
- Utilities like watch(), devtools(), proxySet(), and proxyMap() for advanced state workflows
- Supports computed properties via JavaScript getters on proxy objects
- Supports vanilla JavaScript usage outside React with full state-tracking support
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MIT LicenseFollow Valtio
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