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: [

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

  created () {'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.

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Thank you!