Transform ECMAScript Observable / Zen Observable into RXJS Observable

Question

Transform ECMAScript Observable / Zen Observable into RXJS Observable

I currently have an ECMAScript Observable that is compliant with specifications, specifically sourced from the wonka library. I am facing challenges in converting this type of observable to an rxjs 6 observable.

It appears that this conversion was possible with rxjs 5. I attempted the following:

import { pipe, toObservable, fromArray } from 'wonka';
import { from } from 'rxjs';
...
from(
  pipe(
    fromArray([1, 2, 3]),
    toObservable
  )
);

Upon testing this code in the browser, I encountered this error message:

ERROR TypeError: You provided an invalid object where a stream was expected.
You can provide an Observable, Promise, Array, or Iterable.

and also received this error:

Argument of type 'observableT<any>' is not assignable to parameter of type 'ObservableInput<any>'

In order to work around this issue, I managed to convert it to a zen-observable by following these steps:

npm i zen-observable
npm i --save-dev @types/zen-observable

import { from } from 'zen-observable';
...
getObservable(): Observable<any> {
  return from(
    pipe(
      fromArray([1, 2, 3]),
      toObservable
    ) as any) as any;
}

However, utilizing a zen-observable does not offer the same capabilities and functionalities as an rxjs observable.

If you have insights on how to properly convert this to an rxjs observable, I would greatly appreciate your help.

Thank you, J

typescript rxjs observable urql

Answer 1

Answer №1

Create a conversion method that leverages the similarity in subscription APIs:

function convertZenToRx<T>(zenObservable: Zen.Observable<T>): Rx.Observable<T> {
  return new Rx.Observable(
    observer => zenObservable.subscribe(observer)
  );
}

Answer 2

Create a conversion method that leverages the similarity in subscription APIs:

function convertZenToRx<T>(zenObservable: Zen.Observable<T>): Rx.Observable<T> {
  return new Rx.Observable(
    observer => zenObservable.subscribe(observer)
  );
}

Answer 3

Answer №2

After tweaking backtick's solution, I finally made it functional:

return new Observable((observer: any) => {
  pipe(
    fromArray([1, 2, 3]),
    toObservable
  ).subscribe(observer);
});

Answer 4

After tweaking backtick's solution, I finally made it functional:

return new Observable((observer: any) => {
  pipe(
    fromArray([1, 2, 3]),
    toObservable
  ).subscribe(observer);
});

Answer 5

Answer №3

Unfortunately, none of the solutions provided up to 08 Jun 2023 seemed to work for my specific case.

In response, I took matters into my own hands and crafted a custom injectable service class.

Check out the code snippet below:

// Class: CustomConverterService (injectable service)
// Author: [Your Name]
// Date: [Current Date]
//
// Description: This service is designed to convert a Zen Observable to an Rx
// Observable, allowing you to leverage the powerful features that Rx offers.
// By mirroring Zen Observable events onto an Rx Observable using Subjects,
// we can seamlessly integrate the two frameworks.
//
// The resulting Subject<T> can be used as either an Rx Observable<T>
// or Rx Subject<T>, depending on your preference.
//
// One key advantage of using Rx Observables/Subjects over Zen Observables
// is the ability to utilize Rx pipes and utilities like @ngneat/until-destroy
// for automatic subscription cleanup.
//
// Note that our custom Zen subscription is automatically unsubscribed when
// the Subject<T> is unsubscribed or terminated.
//
// Remember to manage the subscriptions obtained from the returned Subject<T> object.
//
// For usage in Angular components, ensure you are familiar with injecting services.
//
import { Injectable } from '@angular/core';
import { Subject, finalize } from 'rxjs';
import { Observable } from 'zen-observable-ts';

@Injectable({
  providedIn: 'root',
})
export class CustomConverterService {
  convertZenObservable<T>(zenObservable: Observable<T>): Subject<T> {
    const subject = new Subject<T>();
    const zenSubscription = zenObservable.subscribe((e: T) => subject.next(e));

    return subject.pipe(
      finalize(() => {
        zenSubscription.unsubscribe();
        console.log('Zen subscription successfully unsubscribed!');
      })
    ) as Subject<T>;
  }
}

Answer 6

Unfortunately, none of the solutions provided up to 08 Jun 2023 seemed to work for my specific case.

In response, I took matters into my own hands and crafted a custom injectable service class.

Check out the code snippet below:

// Class: CustomConverterService (injectable service)
// Author: [Your Name]
// Date: [Current Date]
//
// Description: This service is designed to convert a Zen Observable to an Rx
// Observable, allowing you to leverage the powerful features that Rx offers.
// By mirroring Zen Observable events onto an Rx Observable using Subjects,
// we can seamlessly integrate the two frameworks.
//
// The resulting Subject<T> can be used as either an Rx Observable<T>
// or Rx Subject<T>, depending on your preference.
//
// One key advantage of using Rx Observables/Subjects over Zen Observables
// is the ability to utilize Rx pipes and utilities like @ngneat/until-destroy
// for automatic subscription cleanup.
//
// Note that our custom Zen subscription is automatically unsubscribed when
// the Subject<T> is unsubscribed or terminated.
//
// Remember to manage the subscriptions obtained from the returned Subject<T> object.
//
// For usage in Angular components, ensure you are familiar with injecting services.
//
import { Injectable } from '@angular/core';
import { Subject, finalize } from 'rxjs';
import { Observable } from 'zen-observable-ts';

@Injectable({
  providedIn: 'root',
})
export class CustomConverterService {
  convertZenObservable<T>(zenObservable: Observable<T>): Subject<T> {
    const subject = new Subject<T>();
    const zenSubscription = zenObservable.subscribe((e: T) => subject.next(e));

    return subject.pipe(
      finalize(() => {
        zenSubscription.unsubscribe();
        console.log('Zen subscription successfully unsubscribed!');
      })
    ) as Subject<T>;
  }
}

Transform ECMAScript Observable / Zen Observable into RXJS Observable

Answer №1

Answer №2

Answer №3

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