Fwd: Intent to ship: Optimize await and AsyncFromSyncIterator
Maya Lekova
Contact emails
Explainer
https://docs.google.com/document/d/1kL08cz4lR6gO5b2FATNK3QAfS8t-6K6kdk88U-n8tug/edit?usp=sharing
Spec
The ECMAScript specification change reached consensus. Pull request: https://github.com/tc39/ecma262/pull/1250
The tag review process is not needed, TC39 consensus was reached instead.
Summary
The goal of this change is to reduce the native “await” functionality to only take 1 tick on the microtask queue instead of 3.
Is this feature supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes.
Risks
Interoperability and Compatibility
Edge: Shipped
Firefox: No signals
Safari: No signals
Web developers: Shouldn’t affect web developers, as most of them transpile away async/await and Babel already ships with the new behaviour.
Activation
The new behaviour won’t affect the way async/await is being used.
Is this feature fully tested by web-platform-tests?
Test262 tests are being implemented. We have related tests in the V8 repository in
test/inspector/debugger.
Entry on the feature dashboard
Fits under https://www.chromestatus.com/feature/5643236399906816, as this is simply an errata to the spec.
---
Best regards,
Maya
Mathias Bynens
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Sathya Gunasekaran
LGTMOn Fri, Sep 28, 2018 at 7:57 AM Maya Lekova <msle...@chromium.org> wrote:Contact emails
Explainer
https://docs.google.com/document/d/1kL08cz4lR6gO5b2FATNK3QAfS8t-6K6kdk88U-n8tug/edit?usp=sharing
Spec
The ECMAScript specification change reached consensus. Pull request: https://github.com/tc39/ecma262/pull/1250
The tag review process is not needed, TC39 consensus was reached instead.
Summary
The goal of this change is to reduce the native “await” functionality to only take 1 tick on the microtask queue instead of 3.
Is this feature supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes.
Risks
Interoperability and Compatibility
Edge: Shipped
Firefox: No signals
Safari: No signals
Web developers: Shouldn’t affect web developers, as most of them transpile away async/await and Babel already ships with the new behaviour.