LineNumbers not working in typescript?

[mke21]

I don't seem to be able to use linenumbers somehow in typescript with webpack:

import { CodeJar } from "codejar";
import { withLineNumbers } from 'codejar/linenumbers';

const CONFIG = {
	tab: ' '.repeat(2)
};

function highlight(editor: HTMLElement): void {
       // shortened highlight function
	let code = editor.textContent;
	code = code.replace(
		/(#.*)/g,
		'<span class="comment">$1</span>'
	);
	editor.innerHTML = code;
}

let div = <HTMLDivElement>document.createElement("div");
document.body.appendChild(div);
let editor = CodeJar(div, withLineNumbers(highlight), CONFIG);

The compiler does not like this:

  ./node_modules/codejar/linenumbers.ts 2.39 KiB [built] [code generated] [1 error]
ERROR in ./node_modules/codejar/linenumbers.ts 1:5
Module parse failed: Unexpected token (1:5)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders

What am I doing wrong?