Pinia store encountering a Typescript Vue component issue: error message "The property 'testStore' does not exist on the 'CreateComponentPublicInstance' type."

Within my <script setup> block, I have imported my testStore. However, whenever I attempt to use this.testStore.name in my Vue file, Vetur displays the following error:

Property 'testStore' does not exist on type 'CreateComponentPublicInstance<{ [x: string & `on${string}`]: ((...args: any[]) => any) | undefined; } | { [x: string & `on${string}`]: undefined; }, {}, {}, {}, {}, ComponentOptionsMixin, ComponentOptionsMixin, ... 10 more ..., {}>'.
  Property 'testStore' does not exist on type '{ $: ComponentInternalInstance; $data: {}; $props: { [x: string & `on${string}`]: ((...args: any[]) => any) | undefined; } | { [x: string & `on${string}`]: undefined; }; ... 10 more ...; $watch(source: string | Function, cb: Function, options?: WatchOptions<...> | undefined): WatchStopHandle; } & { ...; } & ShallowU...'.Vetur(2339)

As a beginner in typescript, I am unsure how to resolve this issue. The Pinia documentation does not offer clear guidance on this matter (I could only find information on creating a shim for custom properties but nothing regarding defining stores).

This is my pinia store file (testStore.ts)

import { defineStore } from 'pinia';

const state = () => ({
  name: 'This is my store'
});

const actions = {};

const getters = {
};
export const useTestStore = defineStore('testStore', {
  state,
  getters,
  actions,
});

This is my .vue file

<script setup lang="ts">
import { defineComponent } from 'vue'
import { useTestStore } from '@/stores/testStore';
const testStore = useTestStore();
</script>
<template>
  {{ testStore.name }}
</template>
<script lang="ts">
export default defineComponent({
  name: 'testStore',
  mounted () {
    console.log(this.testStore.name)
  }
});
</script>

Answer №1

I believe your code should look like this:

<script setup lang="ts">
  import { defineComponent } from 'vue'
  import { useTestStore } from '@/stores/testStore';
  
  const testStore = useTestStore();

  console.log(testStore); // Display the testStore
</script>

<template>
  {{ testStore.name }}
</template>

Note:

<script setup lang="ts"></script>

and

<script lang="ts">
  export default defineComponent({});
</script>

Both are used for defining components, choose just one, not both.

Here are some Vue documentation links that may be helpful:

https://vuejs.org/guide/typescript/composition-api.html

https://vuejs.org/guide/typescript/options-api.html

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