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let fakeAsyncData$ = new Observable(observer => {
  setTimeout(() => {
    observer.next('New data is coming');
    observer.complete();
  }, 2000);
});

fakeAsyncData$.subscribe({
  next(val) { console.log(val) } ,
  error(e) { console.log(e) } ,
  complete() { console.log('complete') } 
});