31796e8e2f
In the early Zone.js versions (< 0.10.3), `ZoneAwarePromise` did not support `Symbol.species`, so when user used a 3rd party `Promise` such as `es6-promise`, and try to load the promise library after import of `zone.js`, the loading promise library will overwrite the patched `Promise` from `zone.js` and will break `Promise` semantics with respect to `zone.js`. Starting with `zone.js` 0.10.3, `Symbol.species` is supported therefore this will not longer be an issue. (https://github.com//pull/34533) Before 0.10.3, the logic in zone.js tried to handle the case in the wrong way. It did so by overriding the descriptor of `global.Promise`, to allow the 3rd party libraries to override native `Promise` instead of `ZoneAwarePromise`. This is not the correct solution, and since the `Promise.species` is now supported, the 3rd party solution of overriding `global.Promise` is no longer needed. PR removes the wrong work around logic. (This will improve the bundle size.) PR Close #36851 |
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README.md
Zone.js
Implements Zones for JavaScript, inspired by Dart.
If you're using zone.js via unpkg (i.e. using
https://unpkg.com/zone.js) and you're using any of the following libraries, 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.
Read up on Zone Primer.
What's a Zone?
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:
See also
- async-listener - a similar library for node
- Async stack traces in Chrome
- strongloop/zone (Deprecated)
- vizone - control flow visualizer that uses zone.js
Standard API support
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.
Nonstandard API support
We are adding support to some nonstandard APIs, such as MediaQuery and Notification. Please see NON-STANDARD-APIS.md for more details.
Examples
You can find some samples to describe how to use zone.js in SAMPLE.md.
Modules
zone.js patches the async APIs described above, but those patches will have some overhead. Starting from zone.js v0.8.9, you can choose which web API module you want to patch. For more details, please see MODULE.md.
Bundles
There are several bundles under dist folder.
| Bundle | Summary |
|---|---|
| zone.js | the default bundle, contains the most used APIs such as setTimeout/Promise/EventTarget..., also this bundle supports all evergreen and legacy (IE/Legacy Firefox/Legacy Safari) Browsers |
| zone-evergreen.js | the bundle for evergreen browsers, doesn't include the patch for legacy browsers such as IE or old versions of Firefox/Safari |
| zone-legacy.js | the patch bundle for legacy browsers, only includes the patch for legacy browsers such as IE or old versions of Firefox/Safari. This bundle must be loaded after zone-evergreen.js, zone.js=zone-evergreen.js + zone-legacy.js |
| zone-testing.js | the bundle for zone testing support, including jasmine/mocha support and async/fakeAsync/sync test utilities |
| zone-externs.js | the API definitions for closure compiler |
And here are the additional optional patches not included in the main zone.js bundles
| Patch | Summary |
|---|---|
| webapis-media-query.js | patch for MediaQuery APIs |
| webapis-notification.js | patch for Notification APIs |
| webapis-rtc-peer-connection.js | patch for RTCPeerConnection APIs |
| webapis-shadydom.js | patch for Shady DOM APIs |
| zone-bluebird.js | patch for Bluebird APIs |
| zone-error.js | patch for Error Global Object, supports remove Zone StackTrace |
| zone-patch-canvas.js | patch for Canvas API |
| zone-patch-cordova.js | patch for Cordova API |
| zone-patch-electron.js | patch for Electron API |
| zone-patch-fetch.js | patch for Fetch API |
| zone-patch-jsonp.js | utility for jsonp API |
| zone-patch-resize-observer.js | patch for ResizeObserver API |
| zone-patch-rxjs.js | patch for rxjs API |
| zone-patch-rxjs-fake-async.js | patch for rxjs fakeasync test |
| zone-patch-socket-io.js | patch for socket-io |
| zone-patch-user-media.js | patch for UserMedia API |
Promise A+ test passed
License
MIT