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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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 Patiño Jean-Francois Paradis	Dave Herman Mark Miller Caridy Patiño 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	Michał 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Sync Iterator helpers	Gus Caplan	Michael Ficarra Jonathan Keslin Kevin Gibbons	❓ _{(see outdated)}	_{November 2022}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 and Async 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}
`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 Nicolò Ribaudo	Surma Nicolò 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 Nicolò Ribaudo Ashley Claymore	Robin Ricard Richard Button Nicolò Ribaudo Ashley Claymore	_July 2022
Module Declarations	Daniel Ehrenberg Nicolò Ribaudo	Daniel Ehrenberg Mark Miller Nicolò 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 Nicolò 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.