Pinia Documentation Lookup

Access official Pinia documentation for state management patterns, API references, and advanced features.

When to Use

DO USE when:

• Questions about specific Pinia APIs (defineStore, storeToRefs, $patch, etc.)
• State persistence strategies
• SSR/Nuxt-specific Pinia usage
• Advanced features (plugins, subscriptions, hot module replacement)
• Testing Pinia stores
• Store composition patterns
• Migration from Vuex to Pinia
• Composition API setup store patterns

DO NOT USE when:

• Basic store creation covered in project instructions
• Simple state management questions
• General Nuxt questions (use nuxt-documentation-lookup instead)
• Questions about Option Stores (project uses Composition API only)

Process

1. Search Pinia Docs: Use mcp_nuxt_search_nuxt_docs with query

   • Searches official Pinia documentation
   • Returns relevant sections with content

2. Specific Topics:

   • Core Concepts: "defineStore", "state", "getters", "actions"
   • Setup Stores: "composition API", "setup stores", "ref", "computed"
   • Advanced: "plugins", "subscriptions", "$patch", "hot reload"
   • SSR: "server side rendering", "nuxt", "hydration"
   • TypeScript: "typing stores", "type inference", "TypeScript"
   • Testing: "testing stores", "unit tests", "mocking"

3. Provide Context: Include relevant examples from project instructions

Common Queries

Composition API Patterns

Query: "pinia composition api setup stores"
→ Get Composition API store patterns

API Reference

Query: "storeToRefs pinia destructuring"
→ Learn how to properly destructure store properties

SSR & Nuxt

Query: "pinia nuxt server side rendering"
→ Understand SSR considerations with Pinia

Advanced Features

Query: "pinia plugins custom"
→ Learn about creating custom Pinia plugins

State Persistence

Query: "pinia persist state localStorage"
→ Find persistence strategies and plugins

Testing

Query: "testing pinia stores unit tests"
→ Get testing strategies and examples

Store Composition

Query: "pinia composing stores"
→ Learn how to use multiple stores together

Example Workflow

User: "How do I persist Pinia store to localStorage?"

1. Search: "pinia persist state localStorage"
2. Find documentation on persistence plugins
3. Recommend @pinia-plugin-persistedstate/nuxt
4. Provide installation and code example adapted to project structure

User: "What's the difference between setup stores and option stores?"

1. Inform: This project uses Composition API (setup stores) ONLY
2. Reference project instructions
3. Show setup store example from project conventions
4. Explain why: consistency with Vue 3 Composition API

User: "How to use stores in server-side code?"

1. Search: "pinia nuxt server composables"
2. Get SSR-specific documentation
3. Explain server context considerations
4. Provide Nuxt-specific example

User: "How do I test Pinia stores?"

1. Search: "pinia testing unit tests"
2. Get testing documentation
3. Provide vitest/jest setup example
4. Show test examples from project instructions

Integration with Project

PROJECT STANDARD: This project uses EXCLUSIVELY Composition API (setup stores).

Always reference project conventions from stores.instructions.md:

• ✅ Use setup stores ONLY (Composition API style with arrow function)
• ❌ Never use option stores (object with state/getters/actions)
• Use auto-imports (no explicit imports needed)
• Return readonly() for state properties
• Follow naming convention: use[Domain]Store
• Use storeToRefs() for destructuring reactive properties
• Use ref() for state, computed() for getters

Tools Available

Search Nuxt Docs (includes Pinia)

mcp_nuxt_search_nuxt_docs
- query: Search term for Pinia documentation

For Module Info

mcp_nuxt_get-module
- slug: "@pinia/nuxt" for module details

Response Format

1. Direct answer from documentation
2. Code example adapted to project structure
3. Reference project instructions if applicable
4. Additional context for Nuxt 4 compatibility

Common Topics & Keywords

Basic Concepts

• "defineStore" - Creating stores
• "state" - Reactive state
• "getters" - Computed properties
• "actions" - Methods that can be async

Advanced Features

• "storeToRefs" - Destructuring stores
• "$patch" - Batch state updates
• "$reset" - Reset store to initial state
• "$subscribe" - Watch for state changes
• "plugins" - Extend Pinia functionality

Composition API

• "setup stores" - Composition API style stores
• "ref" - Reactive state in setup stores
• "computed" - Getters in setup stores
• "watch" - Watching store changes

SSR & Nuxt

• "nuxt" - Nuxt-specific usage
• "server side rendering" - SSR considerations
• "hydration" - Client-side state hydration
• "useState" - Nuxt composable for SSR state

TypeScript

• "TypeScript" - Type definitions
• "typing stores" - Store type inference
• "typed actions" - Action type safety

Testing

• "testing" - Testing strategies
• "unit tests" - Unit testing stores
• "mocking" - Mocking dependencies
• "setActivePinia" - Testing setup

Important Notes

• Pinia is Vue's official state management solution (replaces Vuex)
• Setup stores align with Vue 3 Composition API
• Auto-imports via @pinia/nuxt module
• SSR-compatible by default in Nuxt
• Lighter and more intuitive than Vuex
• Full TypeScript support with type inference
• No mutations - actions can be synchronous or asynchronous
• DevTools support for debugging

Additional Resources

• Pinia Official Docs
• Pinia Core Concepts
• Pinia Nuxt Integration
• Pinia Cookbook
• Pinia API Reference