Support Web Workers

[JustAnotherJavaProgrammer]

I don't know if this is the right place to post this, but here is my problem:

I am using vite-imagetools with sveltekit. I also use pdf-lib to generate PDFs inside a Web Worker. To get image URLs for embedding, I import the images like so:

// @ts-ignore
import oldPaper from "$lib/assets/img/certificate/kiwihug-3gifzboyZk0-unsplash.jpg?rotate=270";
import coatOfArms from "$lib/assets/img/certificate/coat_of_arms.png";

After building the project, this results in the following lines in the output:

var aM = "" + new URL("assets/kiwihug-3gifzboyZk0-unsplash-0925bf36.jpg?rotate=270",document.currentScript && document.currentScript.src || document.baseURI).href
      , oM = "" + new URL("assets/coat_of_arms-a692f603.png",document.currentScript && document.currentScript.src || document.baseURI).href;

This obviously fails, as Web Workers have no document:

Uncaught ReferenceError: document is not defined

Apart from putting these files in my static directory and essentially bypassing imagetools entirely, what can I do?