Error message in Angular 9: "The 'pipe' property is not recognized on the 'void' type"

Question

Error message in Angular 9: "The 'pipe' property is not recognized on the 'void' type"

I recently created a function for streaming 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);
      };
    });
  }

However, when I tried using this function, I encountered an error:

Function usage:

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

The error message displayed is:

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

What could be the problem and how can I resolve it?

javascript angular typescript rxjs

Answer 1

Answer №1

In order to successfully implement the functionality, it is crucial to ensure that the observable is returned from the function being called.

For example, the code should look something like this -

return new Observable (observer => {

 function createObservable(url) {
    return new Observable(observer => {
      // Start the process
      this.processObj.src = url;
      this.processObj.load();
      this.processObj.play();

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

      this.addListeners(this.processObj, this.processEvents, eventHandler);
      return () => {
        // Stop the process
        this.processObj.pause();
        this.processObj.currentTime = 0;
        // Remove event listeners
        this.removeListeners(this.processObj, this.processEvents, eventHandler);
      };
    });
  }

Answer 2

In order to successfully implement the functionality, it is crucial to ensure that the observable is returned from the function being called.

For example, the code should look something like this -

return new Observable (observer => {

 function createObservable(url) {
    return new Observable(observer => {
      // Start the process
      this.processObj.src = url;
      this.processObj.load();
      this.processObj.play();

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

      this.addListeners(this.processObj, this.processEvents, eventHandler);
      return () => {
        // Stop the process
        this.processObj.pause();
        this.processObj.currentTime = 0;
        // Remove event listeners
        this.removeListeners(this.processObj, this.processEvents, eventHandler);
      };
    });
  }

Answer 3

Answer №2

After spending some time troubleshooting, I realized that the solution to my problem was actually quite simple. The issue stemmed from me not correctly calling the method that returned an observable. It turns out that I forgot to include the () when making the method call.

Initial Implementation

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

Corrected Implementation

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

Answer 4

After spending some time troubleshooting, I realized that the solution to my problem was actually quite simple. The issue stemmed from me not correctly calling the method that returned an observable. It turns out that I forgot to include the () when making the method call.

Initial Implementation

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

Corrected Implementation

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

Error message in Angular 9: "The 'pipe' property is not recognized on the 'void' type"

Answer №1

Answer №2

Similar questions

When a specific option is selected in a `select` element with the `multiple` attribute, activate the change event

What is causing the continuous appearance of null in the console log?

JavaScript providing inaccurate height measurement for an element

Guide for accessing and interpreting a random folder arrangement using JavaScript located alongside index.html

Generate fresh input fields with distinct identifiers using JavaScript

Approximately 20% of spoken words are not accurately conveyed by Speech Synthesis Google Voices, failing to adhere to the intended voice selection

The web application I developed has a glitch where it duplicates user input when creating a new post, and doesn't display the user's deleted

Creating distinct web addresses for various sections of vue.js pagination

Retrieving Information from JSON Dataset

Is there a way to link table A's ID to table B's userID in a postgreSQL database?

JavaScript: Simply returning an array with no elements

Is there a way to incorporate the Indian rupee symbol into a Google chart?

Deciding whether an array forms a chain of factors

Stop files from being downloaded every time the page is visited

Adding a recently retrieved data to a current array in JavaScript and Vue.js

What is the reason for both the d3 line chart and bar chart being shown simultaneously?

Ensure to pass the object as a prop while navigating to the new route

What is the best way to resolve the unusual resolution issue that arises when switching from Next.js 12 to 13

The Sanity npm package encounters a type error during the build process

My NPM Install is throwing multiple errors (error number 1). What steps can be taken to troubleshoot and