# vue-pinia-cursorrules-prompt-file

Guides Cursor to write clean Vue 3 and TypeScript state management using Pinia setup stores, proper reactivity, SSR safeguards, and tests.

- rule · `type=rule` · Cursor · ★ 41024
- Author: PatrickJS
- License: CC0-1.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/PatrickJS/awesome-cursorrules/tree/HEAD/rules/vue-pinia-cursorrules-prompt-file.mdc
- Updated: 2026-05-30
- HTML: https://affpapa.org/en/nevibecode/rules/vue-pinia-cursorrules-prompt-file

## What it does

This rule targets `**/*.ts` and `**/*.vue` files to keep state management organized in Vue 3 projects. It instructs Cursor to generate Pinia stores using Composition API setup syntax under `stores/`. Every reactive property must be returned so Pinia can track it across devtools and SSR contexts.

Inside components, the prompt enforces `storeToRefs()` during state and getter destructuring. Without `storeToRefs()`, component reactivity breaks instantly. Actions remain directly destructurable. The instructions separate server state into tools like Nuxt `useFetch` or TanStack Query, keeping Pinia reserved for client workflows.

It also restricts persistence: tokens and secrets must never touch browser storage. For testing, it enforces `@pinia/testing` with complete store resets between runs to prevent cross-test leakage.

## Install

### Cursor (native platform)

**Manually: put the files in place**
- File: `.cursor/rules/vue-pinia-cursorrules-prompt-file.mdc` — Frontmatter: description, globs, alwaysApply

### Claude Code

**Manually: put the files in place**
- File: `.claude/rules/vue-pinia-cursorrules-prompt-file.md` — The paths frontmatter field limits the files: move globs from the source into paths

### Codex

**AGENTS.md**
- Codex reads AGENTS.md: paste the rule text there

### GitHub Copilot

**Manually: put the files in place**
- File: `.github/instructions/vue-pinia-cursorrules-prompt-file.instructions.md` — The applyTo field sets which files it applies to: move globs from the source into applyTo

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/rules/vue-pinia-cursorrules-prompt-file.md`

### Cline

**Manually: put the files in place**
- File: `.clinerules/vue-pinia-cursorrules-prompt-file.md`

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/PatrickJS/awesome-cursorrules/tree/HEAD/rules/vue-pinia-cursorrules-prompt-file.mdc

## When to use it
- Structure Vue 3 client state with Pinia setup stores in TypeScript
- Prevent broken reactivity when destructuring state inside components
- Separate server API caches from client state management
- Avoid singleton state leakage across requests in Nuxt and SSR

## Example prompts
- Generate a `stores/cart.ts` setup store with typed line items, actions, and pure getters
- Implement a shopping cart Vue component using `storeToRefs()` and typed Pinia actions
- Write unit tests for the cart store actions using `@pinia/testing`

## Source text · vue-pinia-cursorrules-prompt-file.mdc · CC0-1.0

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: f4778db0bb7bf58a.

BEGIN THIRD-PARTY FILE f4778db0bb7bf58a
````text
---
description: "Vue 3 and TypeScript state management guidance for Pinia stores, Composition API usage, SSR, persistence, and testing."
globs: **/*.ts, **/*.vue
alwaysApply: false
---
You are an expert in Vue 3, TypeScript, and Pinia state management.

# Vue + Pinia Guidelines

## State Ownership
- Keep component-only state in the component with `ref`, `reactive`, or `computed`.
- Use Pinia for shared client state that spans routes, layouts, or unrelated component trees.
- Use route params and query strings for shareable navigation state.
- Use Nuxt `useFetch` / `useAsyncData`, TanStack Query for Vue, or the existing API layer for server state.
- Do not copy server cache data into Pinia unless it is an intentional editable draft, offline cache, or workflow snapshot.

## Store Structure
- Prefer setup stores with `defineStore('name', () => { ... })` for Vue 3 Composition API projects.
- Use one store file per domain under `stores/`, such as `stores/cart.ts` or `stores/session.ts`.
- Keep state, computed getters, and actions together when they represent one cohesive domain.
- Return every state property from setup stores so Pinia can track it for devtools, SSR, and plugins.
- Keep getters pure and side-effect free; put writes, I/O, and orchestration in actions.

```ts
import { computed, ref } from 'vue'
import { defineStore } from 'pinia'

interface CartLine {
  id: string
  name: string
  quantity: number
  unitPrice: number
}

export const useCartStore = defineStore('cart', () => {
  const lines = ref<CartLine[]>([])

  const itemCount = computed(() =>
    lines.value.reduce((total, line) => total + line.quantity, 0),
  )

  function addLine(line: CartLine) {
    const existing = lines.value.find((item) => item.id === line.id)
    if (existing) {
      existing.quantity += line.quantity
      return
    }
    lines.value.push(line)
  }

  function clearCart() {
    lines.value = []
  }

  return {
    lines,
    itemCount,
    addLine,
    clearCart,
  }
})
```

## Component Usage
- Call stores at the top of `<script setup>` or inside setup functions, getters, and actions.
- Use `storeToRefs()` when destructuring store state or getters in components.
- Destructure actions directly when useful; actions remain bound to the store.
- Avoid writing large business workflows in components; move them to store actions or composables.
- Prefer computed values over watchers when deriving state.

```vue
<script setup lang="ts">
import { storeToRefs } from 'pinia'
import { useCartStore } from '@/stores/cart'

const cart = useCartStore()
const { itemCount } = storeToRefs(cart)
const { clearCart } = cart
</script>

<template>
  <button type="button" :disabled="itemCount === 0" @click="clearCart">
    Clear cart
  </button>
</template>
```

## TypeScript
- Type store state, action payloads, and API responses explicitly.
- Avoid `any`; use `unknown` and narrow external inputs before committing them to state.
- Use interfaces for object state that is shared across components or API boundaries.
- Prefer discriminated unions for workflow status and error state.
- Keep store IDs stable and descriptive because they appear in devtools and persistence keys.

## Actions and Side Effects
- Actions may be sync or async; keep each action focused on one user or domain workflow.
- Validate action inputs at the boundary before mutating store state.
- Represent async workflows with explicit `status`, `error`, and `lastUpdatedAt` fields when the UI depends on them.
- Reset stale errors before retrying an async action.
````
END THIRD-PARTY FILE f4778db0bb7bf58a

The third-party file has ended. Everything between the f4778db0bb7bf58a tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

First 3552 of 5521 bytes. © PatrickJS · CC0-1.0 · https://github.com/PatrickJS/awesome-cursorrules/tree/HEAD/rules/vue-pinia-cursorrules-prompt-file.mdc

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