ECMAScript proposals

• Stage 1 Proposals
• Stage 0 Proposals
• Finished Proposals
• Inactive 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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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Sync Iterator helpers	Gus Caplan	Michael Ficarra Jonathan Keslin Kevin Gibbons	❓ (see outdated)	November 2022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	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 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 Assertions	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

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:

1. Transfer your repository to the @tc39-transfer organization

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

2. 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!).