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.
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## FAQ
A few notes about the project and possible questions:
**Q**: _Is Pinia the successor of Vuex?_
**A**: [Yes](https://vuejs.org/guide/scaling-up/state-management.html#pinia)
**Q**: _What about dynamic modules?_
**A**: Dynamic modules are not type safe, so instead [we allow creating different stores](https://pinia.vuejs.org/cookbook/composing-stores.html) that can be imported anywhere
## Installation
```bash
# or pnpm or yarn
npm install pinia
```
If you are using Vue <2.7, make sure to install latest `@vue/composition-api`:
```bash
npm install pinia @vue/composition-api
```
## Usage
### Install the plugin
Create a pinia (the root store) and pass it to app:
```js
// Vue 3
import { createApp } from 'vue'
import { createPinia } from 'pinia'
import App from './App.vue'
const pinia = createPinia()
const app = createApp(App)
app.use(pinia)
app.mount('#app')
```
```js
// Vue 2
import { createPinia, PiniaVuePlugin } from 'pinia'
Vue.use(PiniaVuePlugin)
const pinia = createPinia()
new Vue({
el: '#app',
// other options...
// ...
// note the same `pinia` instance can be used across multiple Vue apps on
// the same page
pinia,
})
```
For more detailed instructions, including [Nuxt configuration](https://pinia.vuejs.org/ssr/nuxt.html#nuxt-js), check the [Documentation](https://pinia.vuejs.org).
### Create a Store
You can create as many stores as you want, and they should each exist in different files:
```ts
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
doubleCounter: (state) => state.counter * 2,
// use getters in other getters
doubleCounterPlusOne(): number {
return this.doubleCounter + 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:
```ts
import { useMainStore } from '@/stores/main'
import { storeToRefs } from 'pinia'
export default defineComponent({
setup() {
const main = useMainStore()
// extract specific store properties
const { counter, doubleCounter } = storeToRefs(main)
return {
// gives access to the whole store in the template
main,
// gives access only to specific state or getter
counter,
doubleCounter,
}
},
})
```
## Documentation
To learn more about Pinia, check [its documentation](https://pinia.vuejs.org).
## License
[MIT](http://opensource.org/licenses/MIT)
