• VSCode Version: 1.38.1 (originally 1.13.1)
• OS Version: any

Steps to Reproduce:

1. Given the files:
   a.js:

/**
 * @param {number} param1
 * @param {string} param2
 */
export function a(param1, param2) {}

index.html:

<script type="module">
  import {a} from './a.js'

  a( )
</script>

2. When typing a(, the type information is not picked up from the definition of a() in a.js.
3. Same works from a JS file

Now that import is beginning to appear in browsers I think handling this would make sense