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ReactiveX /rxjs

A reactive programming library for JavaScript

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RxJS Logo RxJS: Reactive Extensions For JavaScript

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RxJS 7 (beta)


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 v7 of RxJS right now
  • stable - This is the branch for the latest version you'd get if you do
    npm install rxjs

Most PRs should be made to master.


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

It's recommended to pull in the Observable creation methods you need directly from


as shown below with


. And you can pull in any operator you need from one spot, under



import { range } from "rxjs"; import { map, filter } from "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



const { range } = rxjs; const { map, filter } = 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
      set to false

Performance Tests


npm run build\_perf


npm run perf

to run the performance tests with




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.

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