Problems viewing symbols w/ ES6

I am having trouble getting symbols in the outline sidebar using JS ES6. (Old skool JS works fine)

import FeedsCollection from '@/modules/core/feeds/api/collection'

export default {
  name: 'FeedsCollectionApi',

  mixins: [
    FeedsCollection
  ],

  data () {
    return {
      state: {
        view: {
          sort: {
            by: 'created:asc'
          }
        }
      }
    }
  },

  created () {
    console.info('FeedsCollection#created')
  }
}

This code shows no symbols. In the outline it shows a message “No symbols found in the current document”.

I’ve checked that indexing is on and that my files are not being excluded. But still no symbols. Do I conclude that ES6 symbols aren’t supported out-of-the-box and that I need to write an extension … surely not?!

Appreciate any help.

I’m afraid that this forum is for extension development questions only. If you would like to contact Nova support about general questions, please submit your request at the Nova Help Form, as mentioned in the forum guidelines.

Thank you!