Getting JS errors from imported libs

I’m using modern tiddlywiki dev to make my plugin. Often when I import an external library I get an error when running tiddlywiki and I would like to fix it.

In modern I import a library as I would normally in js, and everything compiles together fine. When attempting to run the wiki though I hit this error: TypeError: Cannot read properties of undefined (reading 'navigator')

import { IWidgetEvent, Widget } from 'tiddlywiki';
import { widget } from '$:/core/modules/widgets/widget.js';
import * as pdfMake from 'pdfmake/build/pdfmake';
import htmlToPdfmake from 'html-to-pdfmake';
import 'pdfmake/build/vfs_fonts';

class ExportAsPDF extends widget {
    render(parent: Element, nextSibling: Element) {
        this.computeAttributes();
        this.execute();
    }

    invokeAction(triggeringWidget: Widget, event: IWidgetEvent) {
        var tiddlers = this.wiki.filterTiddlers("[all[]]", this);
        var html = htmlToPdfmake(`
        <div>
            <h1>My title</h1>
            <p>
            This is a sentence with a <strong>bold word</strong>, <em>one in italic</em>,
            and <u>one with underline</u>. And finally <a href="https://www.somewhere.com">a link</a>.
            </p>
        </div>
        `)

        pdfMake.createPdf(<any>html).download();

        console.log(tiddlers);

        return true; // Action was invoked
    };
}

Seems you have ask this in