RxJS operators should not be confused with regular functions

I am encountering an issue when attempting to utilize rxjs in vue with vue-rx and rxjs together.

[Vue warn]: Error in created hook: "TypeError: messageObservable.fromEvent(...).map(...).debounceTime is not a function"

After reviewing the documentation, I have checked my imports and they seem to be correct. Additionally, there are no errors during the JS build process in my development environment.

Here are the imports I am using:

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/fromEvent';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/debounceTime';
import 'rxjs/add/operator/distinctUntilChanged';

Below is the code snippet containing the functions utilizing these methods:

const messageObservable = Observable;

subscriptions(){
        message$: messageObservable
    },
    created(){
        message$.
        fromEvent(document.querySelector('textarea'), 'input').
        map(event => event.target.value).
        debounceTime(500).
        distinctUntilChanged().
        subscribe({
                next: function(value) {
                    console.log(value);
                }
            });
    },

Answer №1

It appears that the tutorial you are following is outdated. The imports are no longer valid. (check changelog)

import { Observable } from 'rxjs/Observable';

import 'rxjs/add/observable/fromEvent';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/debounceTime';
import 'rxjs/add/operator/distinctUntilChanged';

The most recent and stable version is rxjs6. This is the correct approach to using it:

import { fromEvent, map, debounceTime, distinctUntilChanged, switchMap } from 'rxjs/operators'
import { Observable } from 'rxjs';

...

created() {
  message$.
    pipe(
      map(event => event.target.value),
      debounceTime(500),
      distinctUntilChanged()
  ).subscribe(console.log);
}

It seems like this is how you should be utilizing fromEvent.

created() {
      message$.
        pipe(
          switchMap(val => fromEvent(document.querySelector('textarea'), 'input'))
          map(event => event.target.value),
          debounceTime(500),
          distinctUntilChanged()
      ).subscribe(console.log);
}

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