ES6 Example doesn't work

[herrfugbaum]

Describe the bug
The example for the ES6 import does not work.

To Reproduce
Steps to reproduce the behavior:

1. yarn global add serve (ES6 Modules require CORS to be set)
2. cd into the cato root directory (not into /examples)
3. in your terminal type serve
4. Go to http://localhost:5000/examples/es6-module/demo
5. See error in dev tools

Desktop (please complete the following information):

• webpack: ^4.24.0
• Browser: Chrome Version 70.0.3538.102

Additional context

webpack/webpack#3929

webpack/webpack#8318