# Valtio Define

> Comprehensive skills for working with valtio-define

- Skill: `hairyf/valtio-define` (Agent Skill, multi-file: 10 files)
- Install (CLI): `npx skillmds@latest add hairyf/valtio-define`
- Raw SKILL.md: https://api.skillmd.com/api/skills/hairyf/valtio-define/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: hairyf (https://skillmd.com/u/hairyf)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/hairyf/valtio-define

---


> Based on valtio-define v1.3.0 (updated since v1.2.1). A Valtio-based state management library with a Pinia-like API for React applications.

## Overview

valtio-define provides a factory function for creating reactive stores with state, actions, and getters. Built on top of Valtio, it offers a familiar API similar to Pinia with full TypeScript support.

## Core References

| Topic | Description | Reference |
|-------|-------------|-----------|
| defineStore | Core API for creating reactive stores | [core-define-store](references/core-define-store.md) |
| useStore | React hook for accessing store state | [core-use-store](references/core-use-store.md) |
| Types | TypeScript types and interfaces | [core-types](references/core-types.md) |

## Advanced Features

| Topic | Description | Reference |
|-------|-------------|-----------|
| Subscriptions | Subscribe to state changes | [advanced-subscribe](references/advanced-subscribe.md) |
| Patch | Update state with patch operations | [advanced-patch](references/advanced-patch.md) |
| Store to State | Convert store to useState-like hooks | [advanced-store-to-state](references/advanced-store-to-state.md) |

## Features

| Topic | Description | Reference |
|-------|-------------|-----------|
| Plugin System | Extend stores with plugins | [feature-plugin-system](references/feature-plugin-system.md) |
| Persist Plugin | Persist state to storage | [feature-plugin-persist](references/feature-plugin-persist.md) |
| Signal Plugin | JSX inline signals via `$signal` + custom JSX runtime | [feature-plugin-signal](references/feature-plugin-signal.md) |

## Quick Start

```tsx
import { defineStore, useStore } from 'valtio-define'

const store = defineStore({
  state: () => ({ count: 0 }),
  actions: {
    increment() { this.count++ },
  },
  getters: {
    doubled() { return this.count * 2 },
  },
})

function Counter() {
  const state = useStore(store)
  return (
    <div>
      <div>Count: {state.count}</div>
      <div>Doubled: {state.doubled}</div>
      <button onClick={store.increment}>Increment</button>
    </div>
  )
}
```