A reactive programming library for JavaScript
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.github chore(github): don't comment on locked issues (#3804) Jun 7, 2018
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doc docs(observable): update observable docs real quick (#4137) Oct 29, 2018
docs_app docs(installation): fix punctuation (#4358) Nov 19, 2018
integration/systemjs refactor(webSocket): rename back to webSocket ala 5.0 (#3590) Apr 20, 2018
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node-tests fix(node): Subscriber no longer trampled if from another copy of rxjs Mar 26, 2018
perf fix(lint_perf): fix lint issues with newer perf tests Mar 30, 2018
spec-dtslint test(dtslint): add share (#4365) Nov 20, 2018
spec test: fix typo in TestScheduler-spec.ts (#4229) Oct 10, 2018
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RxJS Logo RxJS: Reactive Extensions For JavaScript

Build Status Coverage Status npm version Join the chat at https://gitter.im/Reactive-Extensions/RxJS

Selenium Test Status

RxJS 6 Stable


Find out how to update to v6, automatically update your TypeScript code, and more!


Reactive Extensions Library for JavaScript. This is a rewrite of Reactive-Extensions/RxJS and is the latest production-ready version of RxJS. This rewrite is meant to have better performance, better modularity, better debuggable call stacks, while staying mostly backwards compatible, with some breaking changes that reduce the API surface.

Apache 2.0 License

Versions In This Repository

  • master - This is all of the current, unreleased work, which is against v6 of RxJS right now
  • stable - This is the branch for the latest version you'd get if you do npm install rxjs


By contributing or commenting on issues in this repository, whether you've read them or not, you're agreeing to the Contributor Code of Conduct. Much like traffic laws, ignorance doesn't grant you immunity.

Installation and Usage

ES6 via npm

npm install rxjs

To import only what you need by patching (this is useful for size-sensitive bundling):

import { Observable, Subject, ReplaySubject, from, of, range } from 'rxjs';
import { map, filter, switchMap } from 'rxjs/operators';

range(1, 200)
  .pipe(filter(x => x % 2 === 1), map(x => x + x))
  .subscribe(x => console.log(x));

Alternatively, you can use the built-in pipe method on Observables. See pipeable operators for more information.

CommonJS via npm

To install this library for CommonJS (CJS) usage, use the following command:

npm install rxjs

(Note: destructuring available in Node 8+)

const { Observable, Subject, ReplaySubject, from, of, range } = require('rxjs');
const { map, filter, switchMap } = require('rxjs/operators');

range(1, 200)
  .pipe(filter(x => x % 2 === 1), map(x => x + x))
  .subscribe(x => console.log(x));


For CDN, you can use unpkg:


The global namespace for rxjs is rxjs:

const { Observable, Subject, ReplaySubject, from, of, range } = rxjs;
const { map, filter, switchMap } = rxjs.operators;

range(1, 200)
  .pipe(filter(x => x % 2 === 1), map(x => x + x))
  .subscribe(x => console.log(x));


  • Smaller overall bundles sizes
  • Provide better performance than preceding versions of RxJS
  • To model/follow the Observable Spec Proposal to the observable.
  • Provide more modular file structure in a variety of formats
  • Provide more debuggable call stacks than preceding versions of RxJS


  • npm run build_all - builds everything
  • npm test - runs tests
  • npm run test_no_cache - run test with ts-node set to false

npm run info will list available scripts (there are a lot LOL)

Performance Tests

Run npm run build_perf or npm run perf to run the performance tests with protractor.

Run npm run perf_micro [operator] to run micro performance test benchmarking operator.

Adding documentation

We appreciate all contributions to the documentation of any type. All of the information needed to get the docs app up and running locally as well as how to contribute can be found in the documentation directory.

Generating PNG marble diagrams

The script npm run tests2png requires some native packages installed locally: imagemagick, graphicsmagick, and ghostscript.

For Mac OS X with Homebrew:

  • brew install imagemagick
  • brew install graphicsmagick
  • brew install ghostscript
  • You may need to install the Ghostscript fonts manually:
    • Download the tarball from the gs-fonts project
    • mkdir -p /usr/local/share/ghostscript && tar zxvf /path/to/ghostscript-fonts.tar.gz -C /usr/local/share/ghostscript

For Debian Linux:

  • sudo add-apt-repository ppa:dhor/myway
  • apt-get install imagemagick
  • apt-get install graphicsmagick
  • apt-get install ghostscript

For Windows and other Operating Systems, check the download instructions here: