Migrating from 0.x (v1) to v2

Starting at version 2.0.0-rc.4, pinia supports both Vue 2 and Vue 3! This means, all new updates will be applied to this version 2 so both Vue 2 and Vue 3 users can benefit from it. If you are using Vue 3, this doesn't change anything for you as you were already using the rc and you can check the CHANGELOG for a detailed explanation of everything that changed. Otherwise, this guide is for you!

Deprecations

Let's take a look at all the changes you need to apply to your code. First, make sure you are already running the latest 0.x version to see any deprecations:

npm i 'pinia@^0.x.x'
# or with yarn
yarn add 'pinia@^0.x.x'

If you are using ESLint, consider using this plugin to find all deprecated usages. Otherwise, you should be able to see them as they appear crossed. These are the APIs that were deprecated that were removed:

• createStore() becomes defineStore()
• In subscriptions, storeName becomes storeId
• PiniaPlugin was renamed PiniaVuePlugin (Pinia plugin for Vue 2)
• $subscribe() no longer accepts a boolean as second parameter, pass an object with detached: true instead.
• Pinia plugins no longer directly receive the id of the store. Use store.$id instead.

Breaking changes

After removing these, you can upgrade to v2 with:

npm i 'pinia@^2.x.x'
# or with yarn
yarn add 'pinia@^2.x.x'

And start updating your code.

Generic Store type

Added in 2.0.0-rc.0

Replace any usage of the type GenericStore with StoreGeneric. This is the new generic store type that should accept any kind of store. If you were writing functions using the type Store without passing its generics (e.g. Store<Id, State, Getters, Actions>), you should also use StoreGeneric as the Store type without generics creates an empty store type.

-function takeAnyStore(store: Store) {}
+function takeAnyStore(store: StoreGeneric) {}

-function takeAnyStore(store: GenericStore) {}
+function takeAnyStore(store: StoreGeneric) {}

DefineStoreOptions for plugins

If you were writing plugins, using TypeScript, and extending the type DefineStoreOptions to add custom options, you should rename it to DefineStoreOptionsBase. This type will apply to both setup and options stores.

 declare module 'pinia' {
-  export interface DefineStoreOptions<S, Store> {
+  export interface DefineStoreOptionsBase<S, Store> {
     debounce?: {
       [k in keyof StoreActions<Store>]?: number
     }
   }
 }

PiniaStorePlugin was renamed

The type PiniaStorePlugin was renamed to PiniaPlugin.

-import { PiniaStorePlugin } from 'pinia'
+import { PiniaPlugin } from 'pinia'

-const piniaPlugin: PiniaStorePlugin = () => {
+const piniaPlugin: PiniaPlugin = () => {
   // ...
 }

Note this change can only be done after upgrading to the latest version of Pinia without deprecations.

@vue/composition-api version

Since pinia now relies on effectScope(), you must use at least the version 1.1.0 of @vue/composition-api:

npm i @vue/composition-api@latest
# or with yarn
yarn add @vue/composition-api@latest

webpack 4 support

If you are using webpack 4 (Vue CLI uses webpack 4), you might encounter an error like this:

ERROR  Failed to compile with 18 errors

 error  in ./node_modules/pinia/dist/pinia.mjs

Can't import the named export 'computed' from non EcmaScript module (only default export is available)

This is due to the modernization of dist files to support native ESM modules in Node.js. Files are now using the extension .mjs and .cjs to let Node benefit from this. To fix this issue you have two possibilities:

• If you are using Vue CLI 4.x, upgrade your dependencies. This should include the fix below.
  • If upgrading is not possible for you, add this to your vue.config.js:

    // vue.config.js
    module.exports = {
    configureWebpack: {
    module: {
      rules: [
        {
          test: /\.mjs$/,
          include: /node_modules/,
          type: 'javascript/auto',
        },
      ],
    },
    },
    }

• If you are manually handling webpack, you will have to let it know how to handle .mjs files:

  // webpack.config.js
  module.exports = {
  module: {
    rules: [
      {
        test: /\.mjs$/,
        include: /node_modules/,
        type: 'javascript/auto',
      },
    ],
  },
  }

Devtools

Pinia v2 no longer hijacks Vue Devtools v5, it requires Vue Devtools v6. Find the download link on the Vue Devtools documentation for the beta channel of the extension.

Nuxt

If you are using Nuxt, pinia has now it's dedicated Nuxt package 🎉. Install it with:

npm i @pinia/nuxt
# or with yarn
yarn add @pinia/nuxt

Also make sure to update your @nuxtjs/composition-api package.

Then adapt your nuxt.config.js and your tsconfig.json if you are using TypeScript:

 // nuxt.config.js
 module.exports {
   buildModules: [
     '@nuxtjs/composition-api/module',
-    'pinia/nuxt',
+    '@pinia/nuxt',
   ],
 }

 // tsconfig.json
 {
   "types": [
     // ...
-    "pinia/nuxt/types"
+    "@pinia/nuxt"
   ]
 }

It is also recommended to give the dedicated Nuxt section a read.