Not clear how to load plugins using ES6

Not clear how to load plugin using ES6

**Describe the bug**
I have tried multiple variants, but all I get is `[XXX] is not a function`

**Expected behavior**
A clear and concise example

No files, tests, or entry points are named. Start by reproducing the reported ES6 plugin-loading error and reviewing the existing plugin documentation or examples. Done means documenting a clear ES6 loading example that avoids the reported “is not a function” error.

Written by the indexing model from the issue text.