javascript - Property 'pipe' does not exist on type 'void' Angular 9 - Stack Overflow

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i create a function for stram audio in angular :

 private streamObservable(url) {
    new Observable(observer => {
      // Play audio
      this.audioObj.src = url;
      this.audioObj.load();
      this.audioObj.play();

      const handler = (event: Event) => {
        observer.next(event);
      };

      this.addEvents(this.audioObj, this.audioEvents, handler);
      return () => {
        // Stop Playing
        this.audioObj.pause();
        this.audioObj.currentTime = 0;
        // remove event listeners
        this.removeEvents(this.audioObj, this.audioEvents, handler);
      };
    });
  }

and when i need to using that function it show me error :

function use :

 playStream(url) {
    return this.streamObservable(url).pipe(takeUntil(this.stop$));
}

and show this error :

Property 'pipe' does not exist on type 'void'.

whats the problem ???how can i solve this problem ???

i create a function for stram audio in angular :

 private streamObservable(url) {
    new Observable(observer => {
      // Play audio
      this.audioObj.src = url;
      this.audioObj.load();
      this.audioObj.play();

      const handler = (event: Event) => {
        observer.next(event);
      };

      this.addEvents(this.audioObj, this.audioEvents, handler);
      return () => {
        // Stop Playing
        this.audioObj.pause();
        this.audioObj.currentTime = 0;
        // remove event listeners
        this.removeEvents(this.audioObj, this.audioEvents, handler);
      };
    });
  }

and when i need to using that function it show me error :

function use :

 playStream(url) {
    return this.streamObservable(url).pipe(takeUntil(this.stop$));
}

and show this error :

Property 'pipe' does not exist on type 'void'.

whats the problem ???how can i solve this problem ???

• javascript
• angular
• typescript
• rxjs

Share Improve this question Follow asked Aug 16, 2020 at 6:42 kianoush dortajkianoush dortaj 45199 silver badges2828 bronze badges

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2 Answers 2

Sorted by: Reset to default 5

You need to return the observable from the called function.

Like - return new Observable (observer => {

 private streamObservable(url) {
    return new Observable(observer => {
      // Play audio
      this.audioObj.src = url;
      this.audioObj.load();
      this.audioObj.play();

      const handler = (event: Event) => {
        observer.next(event);
      };

      this.addEvents(this.audioObj, this.audioEvents, handler);
      return () => {
        // Stop Playing
        this.audioObj.pause();
        this.audioObj.currentTime = 0;
        // remove event listeners
        this.removeEvents(this.audioObj, this.audioEvents, handler);
      };
    });
  }

The solution for me was a pretty simple mistake, in my case I was returning an observable but I wasn't calling the method properly. I was missing the () in the method call.

Original Code

this.service.method.pipe().subscribe();

Fixed Code

this.service.method().pipe().subscribe();

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