VueJS: how to reference this.$store in component data property

Question

I am wanting to use my Vuex store data in my app and template.

My Veux store:

var Vue = require('vue');
var Vuex = require('vuex');

Vue.use(Vuex)

let store = new Vuex.Store({
        state: {
            user: {},
        },
    }
}
module.exports = store

I want to use the store data in my app and display it in the template. But, when setting the data in the data property, this.$store is undefined. I am, however, able to access it in the beforeRender function:

var Vue = require('vue'),
store = require('../../link/to/my/store');

module.exports = {
    el: '#selector',

    store,

    components: {},

    data: {
        saving: false,
        user: this.$store.state.user // this.state is not available here
    },

    created: function(){},
    beforeCreate: function() {

        console.log(this.$state.state) // this.$state is available here

        // i get my data in the form of a json string from the dom
        // and update the global store with the data
        let user = document.querySelector('#user-data')
        if (user) this.$store.dispatch('updateUser', JSON.parse(user.innerHTML))

    },

    methods: {}

    }
};

I have also tried with a computed property but to no avail.

Answer 1

As per the Vue documentation:

When defining a component, data must be declared as a function that returns the initial data object.

So, change:

data: {
    saving: false,
    user: this.$store.state.user
},

to this:

data: function () {
  return {
    saving: false,
    user: this.$store.state.user
  };
}

Then the this in the function will have a reference to $store.