any-observable

What is any-observable?

The any-observable package allows you to register an Observable library of your choice and use it throughout your application as a singleton. This means you can use Observables without being locked into a specific library, providing flexibility in your codebase.

What are any-observable's main functionalities?

Registering a specific Observable implementation

This feature allows you to register an Observable implementation that will be used whenever you import 'any-observable'.

const anyObservable = require('any-observable');
anyObservable.register('rxjs'); // or 'zen-observable', etc.

Using the registered Observable

Once an Observable library is registered, you can create and use Observables as you would normally with that library.

const Observable = require('any-observable');
const stream = new Observable(observer => {
  observer.next('Hello, World!');
  observer.complete();
});

stream.subscribe({
  next: console.log,
  complete: () => console.log('Stream finished')
});

Other packages similar to any-observable

rxjs

RxJS is a library for reactive programming using Observables. It provides more functionality out of the box compared to any-observable, which is a wrapper to use any Observable implementation.

zen-observable

Zen Observable is a minimalistic library for Observables. It is smaller and has fewer features than RxJS, but can be used with any-observable to provide a consistent Observable interface.

observable-fns

Observable-fns is a lightweight Observable library that focuses on core functionality. It is similar to zen-observable and can also be used with any-observable.

README

any-observable

Support any Observable library and polyfill

Like any-promise. (Docs are lacking here, so refer to those docs for now)

Install

$ npm install any-observable

You must also install the Observable library you want:

$ npm install zen-observable

Usage

const Observable = require('any-observable'); // Using `zen-observable` since it's installed

Observable.of(1, 2).forEach(value => {
	console.log(value);
});
//=> 1
//=> 2

Registration Shortcuts

This adds the following shortcut registrations:

• rxjs-min: Bare bones RxJs Observable implementation. See the RxJs Installation Instructions for details on patching additional methods into that implementation.
• rxjs: Same as rxjs-min, but adds the somewhat standard Observable.of and Observable.from.
• rxjs-all: The kitchen sink approach to Observables.
• zen: The zen-observable implementation.

Shortcut registration can be done as follows:

import 'any-observable/register/zen';

It's especially handy for more recent versions of Node.js (and many test runners), that offer a --require flag:

$ ava --require=any-observable/register/zen test.js

Related

• is-observable - Check if a value is an Observable
• observable-to-promise - Convert an Observable to a Promise

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