V8 Intent to implement: ES6 classes

[Dmitry Lomov]

Implement ES6 classes including:

- class declaration syntax

- enchancements to objects literal syntax

- ‘super’ keyword and Function.prototype.toMethod

The implementation will proceed in V8 under --harmony-classes flag.

Owners: Adam Klein (ad...@chromium.org), Erik Arvidsson (a...@chromium.org), Dmitry Lomov (dsl...@chromium.org)

# TC39 acceptance

Classes (in the form of compromise “maximally-minimal” classes) has been a part of ES6 for more than a year now. The complete spec has been in ES6 specification draft for quite a while.

At a July 2014 TC39 meeting some significant changes to instantiation semantics for classes were proposed, so the specification may still change in certain aspects.

However implementation of classes is a significant effort for V8, and critically important for Javascript community. It is critical that TC39 receives deep implementation feedback on the feature earlier than later. To mitigate spec changes impact, two of the owners (Erik & Dmitry) are directly involved with ‘instantiation reform’ proposal on TC39. Therefore we believe now is the right time to proceed with ES6 classes’ implementation.

# Interest from other vendors

None of browser vendors currently ship ES6 classes, even though both Firefox and IE stated the intent of doing so.

# Technical considerations

Design document:

https://docs.google.com/a/chromium.org/document/d/1UaIt5SeiM-DI8tSOhtM39eSOpjkDiv2UxP9eFK35Rno/

Cheers,

Adam, Erik, Dmitry

[Dimitri Glazkov]

LGTM with Gusto!!!

:DG<

[newghost]

V8 become more and more complex.

[PhistucK]

Yes, stagnation is much better!

?!

☆PhistucK

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[iradc...@appgeo.com]

Any idea on an estimated completion time for this?

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[Dmitry Lomov]

It's ready when it's ready. We don't do deadlines here (usually).