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ECMAScript proposals

ECMAScript Internationalization API Specification proposals

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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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}	Meeting Notes
Legacy RegExp features in JavaScript	Claude Pache	Mark Miller Claude Pache	_{legacy-regexp}	_{-2026‑01 -2024‑06 -2023‑07 -2017‑05 -2017‑05 -2017‑03 -2016‑09}
Source Phase Imports	Luca Casonato	Guy Bedford Luca Casonato	_{source-phase-imports}	_{-2026‑05 -2026‑01 -2024‑10 -2024‑07 -2024‑06 -2023‑07 -2023‑05 -2023‑05 -2023‑03}
Dynamic Code Brand Checks	Nicolo Ribaudo	Krzysztof Kotowicz Mike Samuel Nicolo Ribaudo	_{No test262 tests}	_{-2026‑05 -2026‑01 -2024‑06 -2024‑04 -2021‑01 -2019‑12 -2019‑07}
Deferring Module Evaluation	Yulia Startsev Guy Bedford	Nicolò Ribaudo	_{import-defer testing plan}	_{-2026‑07 -2026‑03 -2025‑02 -2024‑12 -2024‑12 -2024‑10 -2024‑06 -2024‑04 -2023‑07 -2022‑11 -2021‑01}
Non-extensible Applies to Private	Mark Miller Shu-yu Guo Chip Morningstar Erik Marks	Mark Miller Shu-yu Guo Chip Morningstar Erik Marks	_{nonextensible-applies-to-private}	_{-2025‑09 -2025‑07 -2025‑04}
Import Text	Eemeli Aro	Eemeli Aro	_import-text	_{-2026‑03 -2025‑11}
Error Stack Accessor	Jordan Harband	Jordan Harband Mark Miller	tests PR	_{-2026‑05 -2026‑03 -2025‑11 -2025‑02}
RegExp Buffer Boundaries (`\A`, `\z`, `\Z`)	Ron Buckton	Ron Buckton	tests PR	_{-2026‑05 -2026‑03 -2026‑01 -2023‑07 -2021‑12 -2021‑10}
Await Dictionary	Alexander J. Vincent	Ashley Claymore Jordan Harband Chris de Almeida	_{await-dictionary} tests 1 2	_{-2026‑07 -2025‑11 -2025‑09 -2023‑03}
Curtailing the power of "Thenables"	Matthew Gaudet	Matthew Gaudet	❓	_{-2026‑09 -2026‑09 -2026‑07 -2026‑07 -2026‑05 -2026‑03 -2025‑07 -2025‑02}

Stage 2.7

Proposal	Author	Champion	_{Test262 Feature Flag}	Meeting Notes
Decorators	Daniel Ehrenberg Kristen Hewell Garrett	Kristen Hewell Garrett	_{decorators testing plan}	_{-2026‑05 -2025‑11 -2025‑02 -2024‑06 -2023‑11 -2023‑05 -2023‑03 -2023‑01 -2023‑01 -2022‑06 -2022‑03 -2022‑03 -2022‑03 -2021‑12 -2021‑07 -2020‑09 -2020‑07 -2020‑06 -2020‑03 -2019‑03 -2019‑01 -2018‑11 -2018‑09 -2018‑07 -2018‑05 -2018‑03 -2018‑01 -2018‑01 -2017‑09 -2017‑09 -2017‑07 -2016‑09 -2016‑07 -2016‑05 -2016‑01 -2015‑09 -2015‑05 -2015‑03 -2015‑01 -2014‑04}
Decorator Metadata	Kristen Hewell Garrett	Kristen Hewell Garrett	_{decorator-metadata}	_{-2026‑05 -2024‑06 -2023‑05 -2023‑05 -2023‑03}
ShadowRealm	Caridy Patiño Jean-Francois Paradis	Dave Herman Mark Miller Caridy Patiño Leo Balter Rick Waldron Chengzhong Wu	_ShadowRealm	_{-2025‑02 -2025‑02 -2024‑12 -2024‑06 -2024‑02 -2023‑11 -2023‑09 -2022‑11 -2022‑09 -2022‑06 -2022‑03 -2021‑12 -2021‑08 -2021‑07 -2021‑05 -2021‑04 -2021‑01 -2020‑11 -2020‑06 -2020‑02 -2018‑07 -2018‑05 -2017‑03 -2017‑01 -2015‑05 -2014‑06 -2014‑01}
ESM Phase Imports	Luca Casonato Guy Bedford	Luca Casonato Guy Bedford	❓	_{-2026‑05 -2026‑03 -2024‑12 -2024‑12 -2024‑10 -2024‑06 -2024‑04 -2024‑02}
Immutable ArrayBuffers	Mark Miller Peter Hoddie Richard Gibson Jack Works	Mark Miller Peter Hoddie Richard Gibson Jack Works	❓	_{-2025‑07 -2025‑05 -2025‑04 -2025‑02 -2024‑12 -2024‑10}
Import Bytes	Steven Salat	Steven Salat	_{Import Bytes}	_-2025‑09
JSON.parse options	Robin Ricard Richard Button Nicolò Ribaudo Ashley Claymore	Nicolò Ribaudo Ashley Claymore Peter Klecha	❓	_{-2026‑07 -2026‑03 -2023‑07 -2022‑07}
export all from	Guy Bedford	Nicolò Ribaudo	❓	_{&nbsp-2026‑09 -2026‑05}
Deferred Re-exports	Nicolò Ribaudo	Nicolò Ribaudo	❓	_{-2026‑09 -2026‑05 -2026‑01 -2025‑11 -2025‑09 -2025‑04 -2024‑04}

Stage 2

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.

Contributing to proposals

See Contributing to ECMAScript and How We Work for the most up-to-date information on contributing to proposals to TC39 standards and how proposals advance.

Onboarding 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:

Transfer your repository to the @tc39-transfer organization
- if you are a TC39 delegate, but not a member of that organization, please contact @LJHarb
The Github Administrator, or one of the chairs, 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!).

Name		Name	Last commit message	Last commit date
.github/ISSUE_TEMPLATE		.github/ISSUE_TEMPLATE
ecma402		ecma402
CODE_OF_CONDUCT.md		CODE_OF_CONDUCT.md
CONTRIBUTING.md		CONTRIBUTING.md
README.md		README.md
finished-proposals.md		finished-proposals.md
inactive-proposals.md		inactive-proposals.md
stage-0-proposals.md		stage-0-proposals.md
stage-1-proposals.md		stage-1-proposals.md

Proposal	Author	Champion	Stage 2.7 reviewers	Meeting Notes
`function.sent` metaproperty	Allen Wirfs-Brock		Daniel Ehrenberg Domenic Denicola	_{-2026-01 -2026‑01 -2024‑06 -2022‑06 -2019‑07 -2018‑03 -2015‑11 -2015‑11}
`throw` expressions	Ron Buckton	Ron Buckton	Nicolò Ribaudo	_{-2024‑06 -2024‑02 -2023‑09 -2023‑09 -2023‑07 -2018‑01 -2017‑11 -2017‑09 -2017‑07}
Function implementation hiding	Domenic Denicola Michael Ficarra	Michael Ficarra	Yehuda Katz Waldemar Horwat Mike Samuel	_{-2026‑01 -2024‑06 -2023‑07 -2020‑06 -2019‑12 -2019‑07 -2018‑05}
collection normalization	Bradley Farias		Michael Ficarra Ashley Claymore Jordan Harband	_{-2026‑01 -2021‑03 -2019‑07 -2019‑01}
Module Expressions	Surma Daniel Ehrenberg Nicolò Ribaudo	Surma Nicolò Ribaudo	Leo Balter Guy Bedford Mathieu Hofman Jordan Harband	_-2022‑11
Pipeline Operator	J. S. Choi James DiGioia Ron Buckton Tab Atkins	J. S. Choi Ron Buckton Tab Atkins	Ross Kirsling Christian Ulbrich	_{-2026‑01 -2023‑07 -2022‑03 -2022‑01 -2021‑08 -2021‑03 -2018‑03 -2017‑11 -2017‑09}
Destructure Private Fields	Justin Ridgewell	Kevin Gibbons	Robin Ricard Waldemar Horwat Sarah Groff Hennigh-Palermo Jordan Harband Sergey Rubanov	_{-2026‑01 -2023‑07 -2021‑12}
String.dedent	Misha Kaletsky Hemanth HM Justin Ridgewell	Hemanth HM Justin Ridgewell	Robin Ricard Jordan Harband Mark Cohen Sarah Groff Hennigh-Palermo	_{-2026‑01 -2022‑11 -2022‑09 -2022‑06 -2020‑09}
Module Declarations	Daniel Ehrenberg Nicolò Ribaudo	Mark Miller Nicolò Ribaudo	Richard Gibson Guy Bedford	_-2022‑11
Symbol Predicates	Robin Ricard Jordan Harband	Ashley Claymore Jordan Harband	Daniel Minor Nicolò Ribaudo Mathieu Hofman	_{-2026‑01 -2023‑09 -2023‑05 -2023‑01 -2022‑07}
Async Iterator helpers	Gus Caplan	Michael Ficarra Jonathan Keslin Kevin Gibbons	Richard Gibson Yulia Startsev Jason Orendorff	_{-2026‑07 -2026‑07 -2025‑11 -2024‑06 -2023‑09 -2023‑05}
Iterator.range	Jack Works	Jack Works	Waldemar Horwat Jordan Harband	_{-2026‑01 -2024‑04 -2023‑03}
Async Context	Chengzhong Wu	Andreu Botella Chengzhong Wu Justin Ridgewell	James M Snell Mark S. Miller	_{-2026‑05 -2025‑09 -2025‑07 -2025‑05 -2025‑04 -2024‑12 -2024‑10 -2024‑04 -2023‑09 -2023‑05 -2023‑03 -2023‑02 -2020‑07 -2020‑06}
"Discard" (`void`) Bindings	Ron Buckton	Ron Buckton	Ashley Claymore Oliver Medhurst	_{-2026‑01 -2024‑10 -2024‑10 -2024‑06 -2024‑04 -2024‑02}
Propagate active ScriptOrModule with JobCallback Record	Chengzhong Wu	Chengzhong Wu	Nicolò Ribaudo Chris de Almeida	_{-2026‑01 -2024‑07}
Structs: Fixed Layout Objects and Some Synchronization Primitives	Shu-yu Guo	Shu-yu Guo	Mark Miller Waldemar Horwat Yulia Startsev Nicolò Ribaudo	_{-2024‑10 -2024‑06 -2024‑04 -2024‑02 -2023‑03}
Extractors	Ron Buckton	Ron Buckton	Jordan Harband Justin Ridgewell	_{-2024‑10 -2024‑04 -2024‑02}
SeededPRNG	Tab Atkins	Tab Atkins	Kevin Gibbons Jesse Alama Mark Miller	_{-2025‑05 -2025‑05}
`Math.clamp`	Oliver Medhurst	Oliver Medhurst	Jordan Harband	_{-2025‑05 -2025‑02}
Native Promise Predicate	Mathieu Hofman	Mathieu Hofman	Jordan Harband James Snell Justin Ridgewell	_-2025‑09
`Error.captureStackTrace`	Matthew Gaudet	Matthew Gaudet Dan Minor	Jordan Harband Michael Ficarra	_{-2025‑11 -2025‑07 -2025‑02}
`Object.keysLength`	Ruben Bridgewater Jordan Harband	Ruben Bridgewater Jordan Harband	Eemeli Aro James Snell	_-2025‑07
Sync Imports	Guy Bedford	Guy Bedford	Nicolò Ribaudo James Snell	_{-2026‑01 -2024‑12}
Amount	Ben Allen	Ben Allen	Waldemar Horwat Jordan Harband	_{-2026‑07 -2026‑05 -2026‑03 -2025‑11 -2025‑09 -2025‑09}
Error code property	James Snell	James Snell	Jordan Harband Richard Gibson	_{-2026‑07 -2026‑07 -2026‑03}
Fused Multiply-Add	Waldemar Horwat	Waldemar Horwat	Jordan Harband Michael Ficarra	_-2026‑07
Bigint from exponential	Richard Gibson	Richard Gibson	Michael Ficarra Ruben Bridgewater	_{-2026‑09 -2026‑07 -2026‑07}
`Composites`	Ashley Claymore	Ashley Claymore	Jordan Harband Michael Ficarra Ross Kirsling	_{-2026‑09 -2026‑07 -2025‑11 -2025‑11 -2025‑04}

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