Troubleshooting: Missing MapState in Vuex4 for Vue3 within an MVC project

Within my MVC project, I have successfully integrated Vue3 with Vuex4. However, I have encountered an issue specifically related to the mapState function.

Upon using the following import statements, an error is triggered:

import Vue from 'vue';
import Vuex from 'vuex';

1 Uncaught SyntaxError: Cannot use import statement outside a module

To resolve this issue, I included these files in my _Layout page:

<script src="~/lib/vue/vue.global.js"></script>
<script src="~/lib/vuex/vuex.global.js"></script>

At present, the solution seems to be effective. Though, when attempting to utilize mapState, I am faced with a dilemma and uncertain on how to approach it,

import { mapState } from 'vuex';

I attempted to locate a mapState.js file without success or found files containing limited code that did not yield any results...

const store = new Vuex.Store({
state: {
    count: 0
   }
})

const homeIndex = {
data() {
    return {
    }
},
computed: mapState({
    count: state => state.count,
  })
}

Vue.createApp(homeIndex).mount("#app");

Answer №1

When loading scripts directly, there is no need for the import statement typically used for modules. It can be replaced with Vuex.mapState, similar to how you would use Vuex.Store:

computed: Vuex.mapState({
   count: state => state.count,
})

Alternatively, you can achieve a similar result using object destructuring, giving a more similar appearance to imports. This allows you to utilize mapState just like in the original question:

const { mapState, mapGetters, mapActions } = Vuex;

computed: mapState({
   count: state => state.count,
})

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