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Proposal is at Stage 4 #212

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Proposal is at Stage 4 #212

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Proposal is at Stage 4
Jul 22, 2020
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13 changes: 11 additions & 2 deletions README.md
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# WeakRefs TC39 proposal

## Status

* WeakRef and FinalizationRegistry are now Stage 4, since the July 2020 TC39 meeting
* V8 -- shipping [Chrome 84](https://v8.dev/features/weak-references)
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@chicoxyzzy chicoxyzzy Jul 23, 2020 •
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It's under flag in Chrome 84 (since v74) and is available by default in v85 (beta, stable release is 25 Aug)

* Spidermonkey -- shipping [Firefox 79](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/79) (current Beta)
* JavaScriptCore -- [in progress](https://bugs.webkit.org/show_bug.cgi?id=198710)
* engine262 -- [Initial patch](https://github.com/engine262/engine262/commit/0516660577b050b17e619af4c3f053c7506c670d), now all landed
* XS -- [Shipping in Moddable XS 9.0.1](https://github.com/Moddable-OpenSource/moddable-xst/releases/tag/v9.0.1)

## Introduction

The WeakRef proposal encompasses two major new pieces of functionality:
Expand Down Expand Up @@ -367,6 +376,6 @@ The WeakRefs proposal guarantees that multiple calls to `WeakRef.prototype.deref
## Status

* WeakRefs are now Stage 4
* [Available behind the `javascript.options.experimental.weakrefs` flag in Firefox Nightly](https://bugzilla.mozilla.org/show_bug.cgi?id=1593698)
* [Available behind the `--harmony-weak-refs` flag in V8, by Marja Hölttä](https://bugs.chromium.org/p/v8/issues/detail?id=8179)
* Chrome 84
* Firefox 79
* [Available in Moddable XS](https://github.com/Moddable-OpenSource/moddable-xst/releases/tag/v9.0.1)