ECMAScript proposals

ECMAScript Internationalization API Specification proposals

Contributing new proposals

Please see Contributing to ECMAScript for the most up-to-date information on contributing proposals to this standard.

Active proposals

Proposals follow this process document. This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished. Stage 2 indicates that the committee expects these features to be developed and eventually included in the standard.

Stage 3

Proposal	Author	Champion	Tests	_{Last Presented}
Legacy RegExp features in JavaScript	Claude Pache	Mark Miller Claude Pache	✅	_May 2017
Hashbang Grammar	Bradley Farias	Bradley Farias	✅	_{November 2018}
`Atomics.waitAsync`	Lars Hansen	Shu-yu Guo Lars Hansen	✅	_{December 2019}
Import Assertions	Myles Borins Sven Sauleau Dan Clark Daniel Ehrenberg	Myles Borins Sven Sauleau Dan Clark Daniel Ehrenberg	✅	_{November 2020}
JSON Modules	Myles Borins Sven Sauleau Dan Clark Daniel Ehrenberg	Myles Borins Sven Sauleau Dan Clark Daniel Ehrenberg	✅	_{January 2021}
Temporal	Philipp Dunkel Maggie Johnson-Pint Matt Johnson-Pint Brian Terlson Shane Carr Ujjwal Sharma Philip Chimento Jason Williams Justin Grant	Philipp Dunkel Maggie Johnson-Pint Matt Johnson-Pint Brian Terlson Shane Carr Ujjwal Sharma Philip Chimento Jason Williams Justin Grant	✅	_March 2021
Resizable and growable ArrayBuffers	Shu-yu Guo	Shu-yu Guo	✅	_May 2021
Array find from last	Wenlu Wang	Wenlu Wang Daniel Rosenwasser	✅	_July 2021
ShadowRealm	Caridy Patiño Jean-Francois Paradis	Dave Herman Mark Miller Caridy Patiño Leo Balter	✅	_August 2021
Array Grouping	Justin Ridgewell	Justin Ridgewell	❓	_{December 2021}

Stage 2

Proposal	Author	Champion	_{Last Presented}
`function.sent` metaproperty	Allen Wirfs-Brock	HE Shi-Jun	_July 2019
Decorators	Daniel Ehrenberg	Yehuda Katz Brian Terlson Daniel Ehrenberg Chris Garrett	_July 2021
`throw` expressions	Ron Buckton	Ron Buckton	_{January 2018}
Function implementation hiding	Domenic Denicola Michael Ficarra	Michael Ficarra	_June 2020
New Set methods	Michał Wadas Sathya Gunasekaran	Sathya Gunasekaran	_{January 2019}
Sequence properties in Unicode property escapes	Mathias Bynens	Mathias Bynens	_{October 2019}
collection normalization	Bradley Farias	Bradley Farias	_{January 2019}
Array.isTemplateObject	Mike Samuel, Krzysztof Kotowicz	Krzysztof Kotowicz	_{December 2019}
Iterator helpers	Gus Caplan	Michael Ficarra Jonathan Keslin	_July 2020
Explicit Resource Management	Ron Buckton	Ron Buckton	_{February 2020}
`Map.prototype.emplace`	Bradley Farias	Erica Pramer	_July 2020
Dynamic Import Host Adjustment	Mike Samuel, Krzysztof Kotowicz	Krzysztof Kotowicz	_{December 2019}
WeakRefs `cleanupSome`	Yulia Startsev Daniel Ehrenberg	Yulia Startsev Daniel Ehrenberg	_July 2020
Record & Tuple	Robin Ricard Richard Button	Robin Ricard Richard Button	_{September 2020}
JSON.parse source text access	Richard Gibson	Richard Gibson	_July 2020
Module Blocks	Surma Daniel Ehrenberg	Surma	_{January 2021}
Symbols as WeakMap keys	Daniel Ehrenberg Richard Button Robin Ricard Leo Balter Rick Waldron Caridy Patiño	Daniel Ehrenberg Richard Button Robin Ricard Leo Balter Rick Waldron Caridy Patiño	_April 2021
Adopting Unicode behavior for set notation in regular expressions	Markus Scherer Mathias Bynens	Mathias Bynens	_May 2021
Change Array by copy	Robin Ricard	Robin Ricard	_August 2021
Pipeline Operator	J. S. Choi James DiGioia Ron Buckton Tab Atkins	J. S. Choi Ron Buckton Tab Atkins	_August 2021
Destructure Private Fields	Justin Ridgewell	Justin Ridgewell	_{October 2021}
`Array.fromAsync`	J.S. Choi	J.S. Choi	_{December 2021}
RegExp Modifiers	Ron Buckton	Ron Buckton	_{December 2021}
RegExp Buffer Boundaries (`\A`, `\z`, `\Z`)	Ron Buckton	Ron Buckton	_{December 2021}

✅ means a pull request for tests was merged.

❓ means there is no pull request for tests yet.

🚧 means a pull request for tests was created, but not merged yet.

Onboarding existing proposals

Proposals that are Stage 1 and above must be transferred to the TC39 GitHub organization for discoverability and archival purposes. To onboard a proposal that lives outside the TC39 organization:

Transfer your repository to the @tc39-transfer organization

if you are a TC39 delegate, but not a member of that organization, please contact @LJHarb

One of the chairs (@bterlson, @gesa, @MylesBorins, or @robpalme) will transfer your repository to the TC39 organization the next chance they get.

Note that as part of the onboarding process your repository name may be normalized. Don't worry, repo redirects will continue to work as long as you never create a fork, or a new repository, with the same name - although Github Pages redirects will be broken (please update your links!).

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tc39 / Proposals