Product
Introducing License Enforcement in Socket
Ensure open-source compliance with Socket’s License Enforcement Beta. Set up your License Policy and secure your software!
Valtio is a proxy-state library for React that makes it easy to manage and mutate state with a simple and intuitive API. It leverages JavaScript proxies to create reactive state objects that automatically trigger re-renders in your React components when the state changes.
Reactive State Management
Valtio allows you to create reactive state objects using the `proxy` function. The `useSnapshot` hook is used to subscribe to state changes and trigger re-renders in your React components.
const { proxy, useSnapshot } = require('valtio');
const state = proxy({ count: 0 });
function Counter() {
const snap = useSnapshot(state);
return (
<div>
<p>{snap.count}</p>
<button onClick={() => state.count++}>Increment</button>
</div>
);
}
Derived State
Valtio supports derived state using the `derive` function. This allows you to create computed properties that automatically update when the underlying state changes.
const { proxy, useSnapshot, derive } = require('valtio');
const state = proxy({ count: 0 });
derive({
doubleCount: (get) => get(state).count * 2
});
function Counter() {
const snap = useSnapshot(state);
return (
<div>
<p>{snap.count}</p>
<p>{snap.doubleCount}</p>
<button onClick={() => state.count++}>Increment</button>
</div>
);
}
Middleware
Valtio provides a `subscribe` function to listen for state changes and execute side effects. This is useful for logging, analytics, or other middleware-like functionalities.
const { proxy, subscribe } = require('valtio');
const state = proxy({ count: 0 });
subscribe(state, () => {
console.log('State changed:', state.count);
});
state.count++;
Zustand is a small, fast, and scalable bearbones state-management solution for React. It provides a simple API for creating global state and has a minimalistic approach compared to Valtio. While Valtio uses proxies for reactivity, Zustand uses hooks and selectors for state management.
MobX is a battle-tested library that makes state management simple and scalable by transparently applying functional reactive programming (TFRP). It uses observables to track state changes and automatically re-renders components. MobX is more feature-rich and has a steeper learning curve compared to Valtio.
Redux is a predictable state container for JavaScript apps, commonly used with React. It provides a centralized store and actions to manage state changes. Redux is more verbose and requires more boilerplate code compared to Valtio, but it is highly scalable and has a large ecosystem of middleware and developer tools.
npm i valtio
makes proxy-state simple
import { proxy, useProxy } from 'valtio'
const state = proxy({ count: 0, text: 'hello' })
setInterval(() => {
++state.count
}, 1000)
useProxy
function Counter() {
const snapshot = useProxy(state)
// Rule of thumb: read from snapshots, mutate the source
// The component renders when the snapshot-reads change
return (
<div>
{snapshot.count}
<button onClick={() => ++state.count}>+1</button>
</div>
)
}
import { subscribe } from 'valtio'
// Suscribe to all state changes
const unsubscribe = subscribe(state, () => console.log(`state has changed to ${state}`))
// Unsubscribe by calling the result
unsubscribe()
// Subscribe to a portion of state
subscribe(state.foo, () => console.log(`state.foo has changed to ${state.foo}`))
And that's it!
FAQs
🧙 Valtio makes proxy-state simple for React and Vanilla
The npm package valtio receives a total of 353,343 weekly downloads. As such, valtio popularity was classified as popular.
We found that valtio demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Product
Ensure open-source compliance with Socket’s License Enforcement Beta. Set up your License Policy and secure your software!
Product
We're launching a new set of license analysis and compliance features for analyzing, managing, and complying with licenses across a range of supported languages and ecosystems.
Product
We're excited to introduce Socket Optimize, a powerful CLI command to secure open source dependencies with tested, optimized package overrides.