MutationRecord addedNodes & removedNodes should be typed as NodeList<Element>

[avalanche1]

In the spirit of https://github.com/microsoft/TypeScript/issues/38616 MutationRecord's addedNodes & removedNodes props should be typed as NodeList<Element>

In TS ^4.1.3 they are NodeList which gives me TS2339: Property 'classList' does not exist on type 'Node' error when trying to access one of its members' Element-related properties:

[HolgerJeromin]

But I get TextNodes with this API. This is more a problem with dynamic type change with the ?. operator.

[instil-spencerc]

I was able to get around this error by doing the following:

mutations.forEach({ target }) => {
  if (target instanceof HTMLElement) {
    console.log(target.classList);
  }
});

[avalanche1]

@instil-spencerc cool but we need a fix, not a work around