unsupported MIME type

[2567910]

Hello,
first this a very cool project. But for me the component dose not seem to work. When i implement the component like in the example it dose not work. Every time i click notify me the following error is thrown:

The script has an unsupported MIME type ('text/html').
Uncaught (in promise) DOMException: Failed to register a ServiceWorker for scope ('http://localhost:5000/') with script ('http://localhost:5000/serviceWorker.min.js'): The script has an unsupported MIME type ('text/html').

FYI:
Node: v15.11.0
React: ^16.14.0