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zone.js - npm

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

As Angular moves towards a zoneless application development model, Zone.js is no longer accepting new features, including additional patches for native platform APIs. The team will also not be accepting any low priority bug fixes. Any critical bug fixes that relate to Angular's direct use of Zone.js will still be accepted.

While still a supported part of Angular, the Angular team strongly discourages using Zone.js outside of Angular application contexts.

See the new API here.

Read up on Zone Primer.

Prior to v0.11.1, Zone.js provided two distribution bundle formats in the dist folder. They were (1) ES5 bundle distributed as zone.js and (2) ES2015 bundle distributed as zone-evergreen.js. Both of these bundles were in UMD format, and are used for Angular's differential-loading mechanism.

Starting with v0.11.1, Zone.js follows the Angular Package Format. Therefor the new Zone.js file layout is:

• bundles: ES5 bundle in UMD format.
• fesm2015: ES5 bundle in ESM format.
• dist: ES5 bundle in UMD format. This directory is present to keep backward compatibility.

If you are using Angular CLI, the polyfills.ts file will contain:

import 'zone.js/dist/zone';

Starting with Zone.js v0.11.1+ the import changes to:

import 'zone.js';

Prior to v0.11.1 the import would load the ES5 bundle in UMD format from dist/zone.js. Starting with v0.11.1 the import loads the ES2015 bundle in ESM format instead.

This is a breaking change for legacy browsers such as IE11.

For backwards compatibility zone.js continues to distribute the same bundles under dist. To restore the old behavior import from the dist directory instead like so:

import 'zone.js/dist/zone';

For details, please refer the changelog and the PR.

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:

• async-listener - a similar library for node
• Async stack traces in Chrome
• strongloop/zone (Deprecated)
• vizone - control flow visualizer that uses zone.js

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.

We are adding support to some nonstandard APIs, such as MediaQuery and Notification. Please see NON-STANDARD-APIS.md for more details.

You can find some samples to describe how to use zone.js in SAMPLE.md.

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.

Starting with v0.11.0, zone.js uses Angular Package Format for bundle distribution. (For backwards compatibility, all bundles can still be accessed from dist folder.)

Additional optional patches not included in the zone.js bundles which extend functionality. The additional bundles can be found under zone.js/plugins folder. To use these bundles, add the following code after importing zone.js bundle.

import 'zone.js';
// For example, import canvas patch
import 'zone.js/plugins/zone-patch-canvas';

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