I am new to Pinia, and am having trouble setting up just a basic store. I have been following Pinia's own documentation, and cannot seem to read any state whatsoever from the vue ponent I'm mapping to the Pinia store.

In my app I have:

import { createPinia } from 'pinia';
export default function initApp(el) {
    let app = createApp(MenuApp);
    app.use(router).use(createPinia()).mount(el);
}

I set up a super basic Pinia store, just to get started:

import {defineStore} from 'pinia';

export const useTestPiniaStore = defineStore('testStore', {
    state: () => {
        return {
            name: 'bob'
        }
    },
})

In my vue ponent I have:

<template>
    <div class="menu-page">
        <h1>{{name}}</h1>
    </div>
</template>
<script>
import { mapState } from 'pinia';
import useTestPiniaStore from '@store/modules/piniaStore';

export default {
  puted: {
    ...mapState(useTestPiniaStore['name']),
  }
}
</script>

Pinia appears in my Vue dev tools, but no stores appear within it, and I get the error Cannot read properties of undefined (reading 'name')

I don't understand what I am doing wrong here. If anyone can give some pointers that would be so appreciated.

I am new to Pinia, and am having trouble setting up just a basic store. I have been following Pinia's own documentation, and cannot seem to read any state whatsoever from the vue ponent I'm mapping to the Pinia store.

In my app I have:

import { createPinia } from 'pinia';
export default function initApp(el) {
    let app = createApp(MenuApp);
    app.use(router).use(createPinia()).mount(el);
}

I set up a super basic Pinia store, just to get started:

import {defineStore} from 'pinia';

export const useTestPiniaStore = defineStore('testStore', {
    state: () => {
        return {
            name: 'bob'
        }
    },
})

In my vue ponent I have:

<template>
    <div class="menu-page">
        <h1>{{name}}</h1>
    </div>
</template>
<script>
import { mapState } from 'pinia';
import useTestPiniaStore from '@store/modules/piniaStore';

export default {
  puted: {
    ...mapState(useTestPiniaStore['name']),
  }
}
</script>

Pinia appears in my Vue dev tools, but no stores appear within it, and I get the error Cannot read properties of undefined (reading 'name')

I don't understand what I am doing wrong here. If anyone can give some pointers that would be so appreciated.

• javascript
• vue.js
• vuex
• pinia

3 Answers 3

mapState() requires two arguments, but you've passed it only one.

The 1st argument should be useTestPiniaStore, and the 2nd should be an array of state properties to map (or an object). It looks like you're trying to reference name from useTestPiniaStore, which would be undefined.

Your puted prop should look like this:

<script>
import { mapState } from 'pinia'
import { useTestPiniaStore } from '@/store'

export default {
  puted: {
    ...mapState(useTestPiniaStore, ['name']),