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DebounceTime emits all the events which was captred during the time

By : Blake Biller
Date : October 18 2020, 06:10 AM
Hope this helps You are trying to approach it in a difficult way. Validator takes argument - AbstractControl. AbstractControl has property - valueChanges which return stream of changes in your formControl. So here you add debouceTime and later do other operations and finaly return this stream back to FormControl:
code :
hasDuplicateEmail(control: AbstractControl) {
  return control.valueChanges.pipe(
    switchMap(e => 
      this.http.get('checkForRegisterEmail', {e}).pipe(
        map((res: any) => JSONUtil.isEmpty(res) ? null : { duplicate: true })

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Service like rootScope that emits events

By : user2926142
Date : March 29 2020, 07:55 AM
To fix this issue No. Angular's event system is tied to scopes: the $emit, $broadcast and $on methods exist on the Scope prototype. Services, by default, don't associate with any particular scope so you will need to inject $rootScope to send/listen for events.

how to define facade for a method that emits events in ScalaJS

By : user3186526
Date : March 29 2020, 07:55 AM
I hope this helps . Defining Scala.js facade types is all about giving static types to a JavaScript API. Usually the documentation of the JavaScript does mention types, which can therefore be translated into a formal definition pretty easily.
In this case, the changes methods returns an EventEmitter, which is the first thing you need. Let us define this type, and in particular its on method:
code :
class EventEmitter extends js.Object {
  def on(event: String, listener: js.Function): this.type = js.native
trait ChangesEventEmitter extends EventEmitter {
  def cancel(): Unit = js.native
object ChangesEventEmitter {
  implicit class ChangesEventEmitterEvents(
      val self: ChangesEventEmitter) extends AnyVal {
    def onChange(listener: js.Function1[js.Dynamic, Any]): self.type =
      self.on("change", listener)
trait DBChangesOptions extends js.Object {
  val include_docs: js.UndefOr[Boolean] = js.native
  val limit: js.UndefOr[Int] = js.native
def changes(options: DBChangesOptions = ???): ChangesEventEmitter = js.native

reactivex java creating a custom observer that emits events at some random time in the future

By : 周桂禾
Date : March 29 2020, 07:55 AM
it helps some times I am trying to figure out how to create an async observer and trigger/emit events at some time in the future without rebuilding the observable and the subscriber list. , If your observable is cold, just use .delay(); see f.e. this:
code :
Observable.just("Hello!").delay(10, TimeUnit.SECONDS).subscribe(System.out::println);
  .delay(10, TimeUnit.SECONDS)

How to use debounceTime but still trigger the function after certain time?

By : Josephine Nebit Cast
Date : March 29 2020, 07:55 AM
With these it helps Here's my take on it. The code is way way less elegant than one written by Pavel.
You can try it out in the plunker I prepared. (You'll need to open browser console to see the generated output stream). You may also want to play with the normalEventDebounceTime and forcedInterval key configuration parameters, and/or with the event timing in sourceObservable.
code :
const normalEventDebounceTime = 450;
const forcedInterval = 1000;

const sourceObservable = Rx.Observable.create(observer => {
  setTimeout(() => observer.next('event-0'), 0);
  setTimeout(() => observer.next('event-1'), 1000);
  setTimeout(() => observer.next('event-2'), 1100);
  setTimeout(() => observer.next('event-3'), 1500);
  setTimeout(() => observer.next('event-4'), 2000);
  setTimeout(() => observer.next('event-5'), 5000);
  setTimeout(() => observer.next('event-6'), 8000);
  setTimeout(() => observer.complete(), 9000);

const reschedulingSubject = new Rx.Subject();

const reschedulingObservable = reschedulingSubject.asObservable().debounceTime(forcedInterval);

const debouncedSourceObservable = sourceObservable.debounceTime(normalEventDebounceTime);

let keepWatching = true;

  event => {},
  error => {},
  () => {
    keepWatching = false;
    console.info('Source observable is complete. Stop watching please');

  .merge(debouncedSourceObservable, reschedulingObservable)
  .do(() => {
    if (keepWatching) {
      setTimeout(() => reschedulingSubject.next('forced-next'), 100);
  .subscribe(event => console.info(event));
Source observable is complete. Stop watching please

Error: rxjs/operator/debounceTime has no exported member 'debounceTime'

By : user1837356
Date : March 29 2020, 07:55 AM
To fix this issue I'm migrating from angular 5 to angular 6. When I make npm run build, I'm it is throw to the console the following error: , It is just need to change the import from this:
code :
import { debounceTime } from 'rxjs/operator/debounceTime';
import { debounceTime } from 'rxjs/operators';
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