https://forum.vuejs.org/t/es6-subclassing-of-embeded-types-not-working-inside-vues-data-option/15721

vue-subclassing.js

// Similar to the Lamda setup
class Model {
    constructor() {}

    create() {}
    get() {}
    update() {}
    delete() {}
}

class Bottle extends Model {
    constructor() {
        super()
    }
}

export default {
    data: function() {
      return {
        bottle: new Bottle()
      }
    }
    methods: {
        saveBottle() {
            this.bottle.save();
        }
    }
}