rxjs toolbox

mutation-observer.ts

// https://twitter.com/niklas_wortmann/status/1167361268732370944
const observeOnMutation = (target, config): Observable<MutationRecord[]> => {
  return new Observable((observer) => {
    const mutation = new MutationObserver((mutaitons, instance) => {
      observer.next(mutations);
    });
    
    mutation.observe(target, config);
    
    const teardown = () => {
      mutation.disconnect();
    };
    
    return teardown;
}