Intent to Ship: Async Iteration / Async Generators

[Caitlin Potter]

Contact Emails

ca...@chromium.org

Spec

https://tc39.github.io/proposal-async-iteration/

Summary

Async Generators and the new Async Iteration protocol provide tools for

implementing and consuming data sources not synchronously available in their

entirety. A common use-case is to wrap ReadableStreams for consumption via

`for-await-of` loops (example: https://jakearchibald.com/2017/async-iterators-and-generators/).

Motivation

Promises and Streams are a part of the platform, both from the perspective of the world-wide-web,

and from the perspective of Node.js. This feature provides a streamlined, readable interface for

interacting with complex platform tools, and enables developers to more easily implement

complex schemes which cannot run synchronously.

Interoperability risk

* Firefox: In development
* Edge: Public support
* Safari: In development
* Web developers: No signals

Compatibility risk

Low compatibility risk. There is some risk due to Babel's shipment of an incorrect implementation of 

the standard, and the complexity of feature-testing. That said, the feature has been staged for several

weeks now, and content creators most at risk of running into compatibility risks would have likely

encountered them by now during this period.

Ongoing technical constraints

None (granted, more work is likely needed to reduce the overhead of the feature on low-end devices)

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?

Yes

OWP launch tracking bug

https://bugs.chromium.org/p/v8/issues/detail?id=5855

Link to entry on the Chrome Platform Status

https://www.chromestatus.com/feature/5727385018171392

[Adam Klein]

LGTM!

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[Sathya Gunasekaran]

LGTM2!

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[Brian Birtles]

2017年9月13日水曜日 1時48分54秒 UTC+9 Caitlin Potter:

Interoperability risk

* Firefox: In development

This is already scheduled to ship in Firefox 57 (Intent to ship).

[ca...@chromium.org]

Thanks, I've updated the chromestatus entry.

[vsemoz...@gmail.com]

Shipped today? https://bugs.chromium.org/p/v8/issues/detail?id=5855#c36