valtio
v2.3.1 MIT🧙 Valtio makes proxy-state simple for React and Vanilla
valtio Download Trends
About valtio
Valtio offers a straightforward approach to state management by leveraging JavaScript proxies, aiming to simplify the developer experience for both React and vanilla JavaScript applications. It addresses the common challenge of managing mutable state in a predictable and efficient manner, particularly within component-based architectures. The core problem it solves is enabling developers to work with state as if it were a plain JavaScript object, while internally managing the necessary reactivity and updates.
Designed with simplicity and developer ergonomics in mind, Valtio's philosophy is to allow developers to interact with state directly and mutably without sacrificing the benefits of reactive updates. This makes it an attractive option for developers who prefer a more imperative style of state manipulation but still require a declarative update mechanism in their UI. The primary audience includes React developers seeking an alternative to context-based state or more complex libraries, as well as vanilla JS developers needing a reactive global store.
Valtio's API revolves around the `proxy` function, which turns any object into a reactive proxy, and the `useSnapshot` hook for React components. Developers can directly mutate the proxy object, and any component consuming its state via `useSnapshot` will automatically re-render when relevant parts of the state change. This pattern eliminates the need for manual dispatching of actions or complex state selectors, making updates feel natural and intuitive.
Integration is seamless within the JavaScript ecosystem. For React projects, the `useSnapshot` hook ensures that components only re-render when the specific pieces of state they subscribe to are modified. Beyond React, Valtio can be used in any vanilla JavaScript application, providing a global reactive state accessible throughout the application lifecycle. Its minimal bundle size also makes it suitable for integration into existing projects without significant performance overhead.
With a minified and gzipped bundle size of only 5.8 kB, Valtio presents a highly performant solution for state management. This small footprint ensures minimal impact on application loading times. The library is built upon robust JavaScript proxy technology, providing efficient change detection and updates. Its consistent weekly downloads exceeding 1.2 million indicate a mature and widely adopted solution within the community, with a low number of open issues suggesting stability.
While Valtio excels at mutable proxy-based state, developers should be aware that it does not inherently provide built-in solutions for complex architectural patterns like time-travel debugging or strict immutability enforcement, which are features found in some other state management libraries. Developers requiring these specific advanced patterns might need to integrate additional tools or consider alternative approaches for those particular needs.
When to use
- When you need to manage global or shared state in React applications with a mutable, proxy-based API.
- When you want to avoid boilerplate associated with traditional state management patterns like reducers and actions.
- For vanilla JavaScript applications requiring a simple, reactive global state store that can be updated imperatively.
- When integrating state management into a project where a minimal bundle size (5.8 kB gzipped) is a priority.
- To enable easier state sharing between React components without prop drilling or explicit context providers.
- When leveraging the simplicity of direct object mutation while benefiting from automatic UI updates.
When NOT to use
- If your primary requirement is strict immutability enforcement out-of-the-box, consider libraries with built-in immutability guarantees.
- If you require advanced features like time-travel debugging as a core part of your state management strategy without additional setup.
- When dealing with highly complex state transitions that benefit from the explicit action/reducer pattern found in other libraries.
- If you only need simple, isolated component state, React's built-in `useState` hook might be sufficient and lighter.
- For applications where the overhead of proxy objects is a concern in extremely performance-critical, low-level operations.