No intellisense for computed props on an inherited component

[RCVarley]

• [ x ] I have searched through existing issues
• [ x ] I have read through docs
• [ x ] I have read FAQ

Info

• Platform: Windows 10
• Vetur version: 0.24.0
• VS Code version: 1.44.2

Problem

Using VueJS 2 (javascript), I'm trying to add better intellisense in VSCode.

I can use JSDoc syntax to add type definitions within a component, but don't know how to access those definitions from other components.

In the simplified example below, I have a Base Component with the getIsLoaded and getSetIsLoaded computed properties.

Below that, is the Derived Component which extends: BaseComponent.

I want to make VSCode aware of getSetIsLoaded and getIsLoaded, so that another developer can just type 'this.g' to get a list of the available properties and their types.

Reproducible Case

BaseComponent.vue

...
<script>
export default {
  name: 'BaseComponent',
  props: {
    isLoading: {
      type: Boolean,
      default: false,
  },},
  data: () => ({
    _isLoading: false, // this is intended to be private
  }),
  computed:
    /** @returns {boolean} */
    getIsLoading () {
      return this.$data._isLoading;
    },
    getSetIsLoading: {
      /** @returns {boolean} */
      get () {
        return this.$data._isLoading;
      },
      /** @param {boolean} val emits update:isLoading, val */
      set (val) {
        this.$data._isLoading = val;
        this.$emit('update:isLoading', val);
  },},},
  watch: {
    isLoading: {
      immediate: true,
      handler (val) {
        this.getSetIsLoading = val;
  },},},};
</script>
...

DerivedComponent.vue

...
<script>
import BaseComponent from './BaseComponent.vue';

export default {
  name: 'DerivedComponent',
  extends: BaseComponent,
  computed: {
    valueBundle() {
      return {
        isLoading: this.getSetIsLoading
  };},},};
</script>

...

I'm not sure if this is currently supported (I notice that there's a todo relating to the extends option in the type definitions // TODO: support properly inferred 'extends'), but I would really like to know where I'm going wrong, if I am.