foundation-sites: Uncaught TypeError: Super expression must either be null or a function with BUILD

I’m getting this error when using the foundation-explicit-pieces.js and customize it to my needs. But ONLY when i use foundation build. With foundation watch everything works just fine.

It doesnt matter which lib i turn off or on, tested with everything off and only left import { Foundation } from 'foundation-sites/js/foundation.core'; this works fine, but when i turn on import { OffCanvas } from 'foundation-sites/js/foundation.offcanvas'; it gives me the error when using build.

What should happen?

It should build without any errors …

What happens instead?

Receiving this error: Uncaught TypeError: Super expression must either be null or a function …

Possible Solution

…

Test Case and/or Steps to Reproduce (for bugs)

How to reproduce:

1. Foundation new
2. Select Zurb template
3. Open app.js
4. Uncomment import './lib/foundation-explicit-pieces';
5. Comment out require('foundation-sites');
6. Open foundation-explicit-pieces.js and comment out some imports
7. Run command foundation build

Context

This error stops running any of the javascript following $(document).foundation(); …

Your Environment

• Foundation version(s) used: Foundation CLI 2.2.5 & foundation-sites: ^6.5.1
• Browser(s) name and version(s): Google Chrome Version 77.0.3865.120 (Official Build) (64-bit)
• Device, Operating System and version: iMac macOS High Sierra version 10.13.6
• Node version: v10.15.0
• NPM version: 6.10.3

Checklist

• I have read and follow the CONTRIBUTING.md document.
• There are no other issues similar to this one.
• The issue title and template are correctly filled.