"target": "es2018", => "target": "es2020",?

I'm not entirely sure though, it's worth trying out the extension in both browsers. I think it's as easy as loading it: if it works without errors (content, options, background), then the browser supports the syntax

Webpack errors a lot when I change the output target:

ERROR in ./source/features/linkify-symbolic-links.tsx 7:29
Module parse failed: Unexpected token (7:29)
File was processed with these loaders:
 * ./node_modules/ts-loader/index.js
You may need an additional loader to handle the result of these loaders.
| import features from '.';
| function init() {
>     if (select('.file-mode')?.textContent === 'symbolic link') {
|         const line = select('.js-file-line');
|         wrap(line.firstChild, React.createElement("a", { href: line.textContent }));

I think that can be done later.

Webpack errors a lot when I change the output target:

Apparently due to acornjs/acorn#891

Webpack errors a lot when I change the output target:

Apparently due to acornjs/acorn#891

https://github.com/webpack/webpack/releases/tag/v5.0.0-beta.18 includes the acorn update