title: access vue 3 app instance api from non-vue fiile
body: <p>In vue 2 you can access the Vue instance Global api from .js files like this:</p>
  <pre><code>Vue.prototype.$auth
  </code></pre>
  <p>in Vue 3 you have the app instance, which as far as I know right now only exists within main.js</p>
  <p>so if for instance, I have helper.js, how do I access <code>app.config.globalProperties.$auth</code> from the help file?</p>