Can't connect component via vue loader without node/webpack?

Question

Vue.js

Unable to connect external components through vue loader.
Error:
Unknown custom element: - did you register the component correctly? For recursive components, make sure to provide the "name" option.
Although the component has a name field.
I connect like this:

new Vue ({
el: '#app'
components: {
     'NumberInputSpinner': httpVueLoader('js/components/NumberInputSpinner.vue')
 },

And the component itself looks like this:
....

<script>
export default {
  name: 'NumberInputSpinner',

......
Thanks in advance