Can't get threads.js working with TypeScript/React/Webpack 5

Hello,

I've tried quite a few things but I just can't get even a minimal example of threads.js working with React/Typescript/Webpack5. I followed the documentation, added the threads-plugin to webpack. I uploaded the repo on my GitHub: https://github.com/achimcc/threads_example

Running yarn start, I receive a warning:

> WARNING in No instantiations of threads.js workers found.
> Please check that:

> 1. You have configured Babel / TypeScript to not transpile ES modules
> 2. You import `Worker` from `threads` where you use it

> For more details see: https://github.com/andywer/threads-plugin

While the Chrome console is reporting some errors:

5e513c3f-5e23-4eff-ae53-e43b68f8daf7:1 Refused to execute script from 'http://localhost:8080/4cbcab03c903775de194.ts' because its MIME type ('video/mp2t') is not executable.
(anonymous) @ 5e513c3f-5e23-4eff-ae53-e43b68f8daf7:1
5e513c3f-5e23-4eff-ae53-e43b68f8daf7:1 Uncaught DOMException: Failed to execute 'importScripts' on 'WorkerGlobalScope': The script at 'http://localhost:8080/4cbcab03c903775de194.ts' failed to load.
at blob:http://localhost:8080/5e513c3f-5e23-4eff-ae53-e43b68f8daf7:1:1

I would highly appreciate any advice! Or is there perhaps a sample repo for a minimal TypeScript/Webpack5 setup?

Many thanks in advance,
Achim