Cannot import Observable.fromEvent - RXJS

Question

I'm trying to create an Observable from an input event. I have already tried almost everything and I can not import "fromEvent". This is my code. I am using angular 6.0.1 and RXJS 6.1.0

error TS2339: Property 'fromEvent' does not exist on type 'typeof Observable'.

import { Directive, EventEmitter, Input, Output, ElementRef, ViewChild, AfterViewInit } from '@angular/core';
import { NgControl } from '@angular/forms';
import { distinctUntilChanged } from 'rxjs/internal/operators/distinctUntilChanged';
import { debounceTime } from 'rxjs/internal/operators/debounceTime';
import { map } from 'rxjs/internal/operators/map';
import { filter } from 'rxjs/internal/operators/filter';
import { Observable } from 'rxjs/internal/Observable';
//import 'rxjs/internal/observable/fromEvent';
//import 'rxjs/add/observable/fromEvent';

@Directive({
  selector: '[ngModel][debounceTime]'
})
export class InputDebounceDirective implements AfterViewInit {

  @Output()
  public onDebounce = new EventEmitter<any>();

  @Input('debounceTime')
  public debounceTime: number = 1500;

  constructor(private elementRef: ElementRef, private currentModel: NgControl) { }

  ngAfterViewInit() {
    Observable.fromEvent(this.elementRef.nativeElement, 'keyup')
      .pipe(
        debounceTime(this.debounceTime),
        distinctUntilChanged()
      )
      .subscribe(x => {
        this.onDebounce.emit(x);
      });

  }

}

Answer 1

You must import fromEvent as follows in RxJS6:

import {fromEvent} from 'rxjs';

Read the migration guide for further information, in particular have a look on the import paths section there.

When using fromEvent use it as a function as follows:

fromEvent(this.elementRef.nativeElement, 'keyup')

Not as a static method as follows (this was correct in previous RxJS versions)

Observable.fromEvent(this.elementRef.nativeElement, 'keyup')