I’m using Angular with ngx-build-plus and Webpack Module Federation.

I have a Web Worker like this:

const worker = new Worker(new URL('./model.worker.ts', import.meta.url));

Inside the worker, I import a parser class, and that parser imports a custom Angular library.

Issue

When I use the library inside the worker, I get runtime errors like:

Failed to execute 'importScripts' on 'WorkerGlobalScope':
Module scripts don't support importScripts()

or

Uncaught Error: Cannot find module '210'

Observation

• If I remove the library import → worker works
• If I keep it → worker fails
• Same code works fine with default Angular build, but breaks after using Module Federation

Question

• Why is this happening with webpack + Module Federation?
• Are shared libraries not supported inside Web Workers?
• What is the correct way to use dependencies inside workers in this setup?

Repo for reference: https://github.com/kousik2000/mfe-worker-repo