message: refactor: fix typings for destination
diff: @@ -226,10 +226,10 @@ export class AjaxSubscriber<T> extends Subscriber<Event> {
  next(e: Event): void {
  this.done = true;
  - const { xhr, request, destination } = this;
  - let result;
  + const destination = this.destination as Subscriber<any>;
  + let result: AjaxResponse;
  try {
  - result = new AjaxResponse(e, xhr, request);
  + result = new AjaxResponse(e, this.xhr, this.request);
  } catch (err) {
  return destination.error(err);
  }
  