Pinia

Intuitive, type safe and flexible Store for Vue

💡 Intuitive
🔑 Type Safe
⚙️ Devtools support
🔌 Extensible
🏗 Modular by design
📦 Extremely light

Pinia works both for Vue 2.x and Vue 3.x. It requires Vue 2 with the latest @vue/composition-api or Vue ^3.2.0-0.

Pinia is the most similar English pronunciation of the word pineapple in Spanish: piña. A pineapple is in reality a group of individual flowers that join together to create a multiple fruit. Similar to stores, each one is born individually, but they are all connected at the end. It's also a delicious tropical fruit indigenous to South America.

👉 Demo with Vue 3 on StackBlitz

👉 Demo with Nuxt 3 on StackBlitz

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FAQ

A few notes about the project and possible questions:

Q: Does this replace Vuex, is it its successor?

A: No, or at least that's not the main intention

Q: What about dynamic modules?

A: Dynamic modules are not type safe, so instead we allow creating different stores that can be imported anywhere

Roadmap / Ideas

Should the state be merged at the same level as actions and getters?
~~Allow grouping stores together into a similar structure and allow defining new getters (pinia)~~ You can directly call useOtherStore() inside of a getter or action.
~~Getter with params that act like computed properties (@ktsn)~~ Can be implement through a custom composable and passed directly to state.

Installation

yarn add pinia
# or with npm
npm install pinia

If you are using Vue 2, make sure to install latest @vue/composition-api:

npm install pinia @vue/composition-api

Usage

Install the plugin

Create a pinia (the root store) and pass it to app:

import { createPinia } from 'pinia'

app.use(createPinia())

Create a Store

You can create as many stores as you want, and they should each exist in different files:

import { defineStore } from 'pinia'

// main is the name of the store. It is unique across your application
// and will appear in devtools
export const useMainStore = defineStore('main', {
  // a function that returns a fresh state
  state: () => ({
    counter: 0,
    name: 'Eduardo',
  }),
  // optional getters
  getters: {
    // getters receive the state as first parameter
    doubleCount: (state) => state.counter * 2,
    // use getters in other getters
    doubleCountPlusOne(): number {
      return this.doubleCount * 2 + 1
    },
  },
  // optional actions
  actions: {
    reset() {
      // `this` is the store instance
      this.counter = 0
    },
  },
})

defineStore returns a function that has to be called to get access to the store:

import { useMainStore } from '@/stores/main'
import { storeToRefs } from 'pinia'

export default defineComponent({
  setup() {
    const main = useMainStore()

    // extract specific store properties
    const { counter, doubleCount } = storeToRefs(main)

    return {
      // gives access to the whole store in the template
      main,
      // gives access only to specific state or getter
      counter,
      doubleCount,
    }
  },
})

Documentation

To learn more about Pinia, check its documentation.

License

MIT

jokerdai/pinia