[mkopinsky]

Or as another approach:

    <!-- inventory.html.twig: -->
    <div
        id="app"
        data-inventory="{{ inventory | json_encode }}"
        >
    </div>

    // main.js
    new Vue({
        template: '<App :inventory="inventory"/>',
        components: {App},

        data() {
            return {
                inventory: null
            }
        },
    
        beforeMount: function () {
            this.inventory = JSON.parse(this.$el.attributes['data-inventory'].value);
        }
    }).$mount('#app');