# Zone.js

[![Build Status](https://travis-ci.org/angular/zone.js.png)](https://travis-ci.org/angular/zone.js)
[![CDNJS](https://img.shields.io/cdnjs/v/zone.js.svg)](https://cdnjs.com/libraries/zone.js)

Implements _Zones_ for JavaScript, inspired by [Dart](https://www.dartlang.org/articles/zones/).

> If you're using zone.js via unpkg please provide a query param `?main=browser`  
`https://unpkg.com/zone.js?main=browser`  
> If you're using the following library, make sure you import them first 

> * 'newrelic' as it patches global.Promise before zone,js does
> * 'async-listener' as it patches global.setTimeout, global.setInterval before zone,js does
> * 'continuation-local-storage' as it uses async-listener 

# NEW Zone.js POST-v0.6.0

See the new API [here](./dist/zone.js.d.ts).

Read up on [Zone Primer](https://docs.google.com/document/d/1F5Ug0jcrm031vhSMJEOgp1l-Is-Vf0UCNDY-LsQtAIY).

## What's a Zone?

A Zone is an execution context that persists across async tasks.
You can think of it as [thread-local storage](http://en.wikipedia.org/wiki/Thread-local_storage) for JavaScript VMs.

See this video from ng-conf 2014 for a detailed explanation:

[![screenshot of the zone.js presentation and ng-conf 2014](/presentation.png)](//www.youtube.com/watch?v=3IqtmUscE_U)

## See also
* [async-listener](https://github.com/othiym23/async-listener) - a similar library for node
* [Async stack traces in Chrome](http://www.html5rocks.com/en/tutorials/developertools/async-call-stack/)
* [strongloop/zone](https://github.com/strongloop/zone)
* [vizone](https://github.com/gilbox/vizone) - control flow visualizer that uses zone.js


## License
MIT