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agent-skills/skills/pinia/references/advanced-hmr.md
Jason Woltje f5792c40be feat: Complete fleet — 94 skills across 10+ domains
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-16 16:27:42 -06:00

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---
name: hot-module-replacement
description: Enable HMR to preserve store state during development
---
# Hot Module Replacement (HMR)
Pinia supports HMR to edit stores without page reload, preserving existing state.
## Setup
Add this snippet after each store definition:
```ts
import { defineStore, acceptHMRUpdate } from 'pinia'
export const useAuth = defineStore('auth', {
// store options...
})
if (import.meta.hot) {
import.meta.hot.accept(acceptHMRUpdate(useAuth, import.meta.hot))
}
```
## Setup Store Example
```ts
import { defineStore, acceptHMRUpdate } from 'pinia'
export const useCounterStore = defineStore('counter', () => {
const count = ref(0)
const increment = () => count.value++
return { count, increment }
})
if (import.meta.hot) {
import.meta.hot.accept(acceptHMRUpdate(useCounterStore, import.meta.hot))
}
```
## Bundler Support
- **Vite:** Officially supported via `import.meta.hot`
- **Webpack:** Uses `import.meta.webpackHot`
- Any bundler implementing the `import.meta.hot` spec should work
## Nuxt
With `@pinia/nuxt`, `acceptHMRUpdate` is auto-imported but you still need to add the HMR snippet manually.
## Benefits
- Edit store logic without losing state
- Add/remove state, actions, and getters on the fly
- Faster development iteration
<!--
Source references:
- https://pinia.vuejs.org/cookbook/hot-module-replacement.html
-->