TypeError: Class constructor ResourceLoader cannot be invoked without 'new'

Basic info:

Cannot extend the ResourceLoader to create a custom ResourceLoader. This fails even using the example code from the README.md.

• Node.js version: v8.9.4 && v11.0.0
• jsdom version: v12 & v13

Minimal reproduction case

const jsdom = require('jsdom');
const { ResourceLoader } = jsdom;

class CustomResourceLoader extends ResourceLoader {
  constructor() {
    super({ strictSSL: false });
  }
  fetch(url, options) {
    console.log('URL -- ', url, options);
    return super.fetch(url, options);
  }
}

const resources = new CustomResourceLoader();

How does similar code behave in browsers?

(Link to a jsbin or similar suggested.)

[domenic]

Ah OK. Sounds like a bug in TypeScript then, best filed on their repository.

[gogoout]

Just put the easiest solution here as someone may encounter this. Just add "target": "es6" to your tsconfig.json.