Zones for JavaScript
npm install opbeat-zone

Implements _Zones_ for JavaScript, inspired by Dart.
> 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
See the new API here.
Read up on Zone Primer.
A Zone is an execution context that persists across async tasks.
You can think of it as thread-local storage for JavaScript VMs.
See this video from ng-conf 2014 for a detailed explanation:

zone.js patched most standard web APIs(such as DOM events, XMLHttpRequest...) and nodejs APIs
(EventEmitter,fs ...), for more details, please see STANDARD-APIS.md for
more details.
And now we are adding support to some non standard APIs, such as MediaQuery,
Notification. Please see NON-STANDARD-APIS.md for more details.
zone.js patches the async APIs which described above, but those patch will have some overhead,
from zone.js v0.8.9, you can choose which web API module you want to patch, for detail, please
see MODULE.md for more details.