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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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	_{Test262 Feature Flag}	_{Last Presented}
Legacy RegExp features in JavaScript	Claude Pache	Mark Miller Claude Pache	_{legacy-regexp}	_May 2017
`Atomics.waitAsync`	Lars Hansen	Shu-yu Guo Lars Hansen	_{Atomics.waitAsync}	_{December 2019}
JSON Modules	Myles Borins Sven Sauleau Dan Clark Daniel Ehrenberg	Myles Borins Sven Sauleau Dan Clark Daniel Ehrenberg	_json-modules	_{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	_Temporal	_March 2021
Resizable and growable ArrayBuffers	Shu-yu Guo	Shu-yu Guo	_{resizable-arraybuffer}	_May 2021
ShadowRealm	Caridy Patio Jean-Francois Paradis	Dave Herman Mark Miller Caridy Patio Leo Balter Rick Waldron Chengzhong Wu	_ShadowRealm	_{December 2021}
Array Grouping	Justin Ridgewell	Justin Ridgewell	_{array-grouping}	_{December 2021}
Decorators	Daniel Ehrenberg Chris Garrett	Chris Garrett	_decorators	_March 2022
RegExp v flag with set notation + properties of strings	Markus Scherer Mathias Bynens	Mathias Bynens	_{regexp-v-flag}	_March 2022
JSON.parse source text access	Richard Gibson	Richard Gibson	❓	_June 2022
RegExp Modifiers	Ron Buckton	Ron Buckton	❓	_June 2022
Duplicate named capture groups	Kevin Gibbons	Kevin Gibbons	_{regexp-duplicate-named-groups}	_July 2022
`Array.fromAsync`	J.S. Choi	J.S. Choi	_{Array.fromAsync}	_{September 2022}
New Set methods	Micha Wadas Sathya Gunasekaran Kevin Gibbons	Kevin Gibbons	❓	_{November 2022}
Well-Formed Unicode Strings	Guy Bedford Bradley Farias	Guy Bedford Bradley Farias Michael Ficarra	_{String.prototype.{is,to}WellFormed}	_{November 2022}
Sync Iterator helpers	Gus Caplan	Michael Ficarra Jonathan Keslin Kevin Gibbons	❓ _{(see outdated)}	_{November 2022}
Explicit Resource Management	Ron Buckton	Ron Buckton	❓	_{November 2022}
ArrayBuffer transfer	Shu-yu Guo Jordan Harband Yagiz Nizipli	Shu-yu Guo Jordan Harband Yagiz Nizipli	_{arraybuffer-transfer}	_{January 2023}

Stage 2

Proposal	Author	Champion	_{Last Presented}
`function.sent` metaproperty	Allen Wirfs-Brock	HE Shi-Jun	_July 2019
`throw` expressions	Ron Buckton	Ron Buckton	_{January 2018}
Function implementation hiding	Domenic Denicola Michael Ficarra	Michael Ficarra	_June 2020
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}
Async Explicit Resource Management	Ron Buckton	Ron Buckton	_{November 2022}
`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	_{December 2021}
Module Expressions	Surma Daniel Ehrenberg Nicol Ribaudo	Surma Nicol Ribaudo	_{November 2022}
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	_{December 2021}
RegExp Buffer Boundaries (`\A`, `\z`, `\Z`)	Ron Buckton	Ron Buckton	_{December 2021}
Decorator Metadata	Chris Garrett	Chris Garrett	_March 2022
String.dedent	Misha Kaletsky Hemanth HM Justin Ridgewell	Hemanth HM Justin Ridgewell	_June 2022
Import Reflection	Luca Casonato	Guy Bedford Luca Casonato	_{November 2022}
JSON.parseImmutable	Robin Ricard Richard Button Nicol Ribaudo Ashley Claymore	Robin Ricard Richard Button Nicol Ribaudo Ashley Claymore	_July 2022
Module Declarations	Daniel Ehrenberg Nicol Ribaudo	Daniel Ehrenberg Mark Miller Nicol Ribaudo	_{November 2022}
Symbol Predicates	Robin Ricard Jordan Harband	Ashley Claymore Jordan Harband	_{January 2023}
Import Attributes	Myles Borins Sven Sauleau Dan Clark Daniel Ehrenberg	Sven Sauleau Dan Clark Daniel Ehrenberg Nicol Ribaudo	_{January 2023}
Async Iterator helpers	Gus Caplan	Michael Ficarra Jonathan Keslin Kevin Gibbons	_{January 2023}
Iterator.range	Jack Works	Jack Works	_March 2023
Float16 on TypedArrays, DataView, `Math.f16round`	Leo Balter	Leo Balter Kevin Gibbons	_March 2023
Async Context	Chengzhong Wu	Chengzhong Wu Justin Ridgewell	_March 2023

The test262 feature flag links to a code search of tests using that feature flag, which may constitute complete or partial coverage. The ❓ means there is no feature flag for tests 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!).