ECMAScript proposals

ECMAScript Internationalization API Specification proposals

Contributing to 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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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}	_{Last Presented}
Legacy RegExp features in JavaScript	Claude Pache	Mark Miller Claude Pache	_{legacy-regexp}	_May 2017
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 testing plan}	_July 2024
Decorators	Daniel Ehrenberg Kristen Hewell Garrett	Kristen Hewell Garrett	_{decorators testing plan}	_March 2023
JSON.parse source text access	Richard Gibson	Richard Gibson	_{json-parse-with-source testing plan}	_{January 2023}
`Array.fromAsync`	J.S. Choi	J.S. Choi	_{Array.fromAsync}	_May 2023
Explicit Resource Management	Ron Buckton	Ron Buckton	_{explicit-resource-management}	_March 2023
Decorator Metadata	Kristen Hewell Garrett	Kristen Hewell Garrett	_{decorator-metadata}	_May 2023
Source Phase Imports	Luca Casonato	Guy Bedford Luca Casonato	_{source-phase-imports}	_July 2023
Time Zone Canonicalization	Justin Grant	Justin Grant Richard Gibson	_{Temporal.TimeZone}	_July 2023
Uint8Array to/from Base64	Kevin Gibbons	Kevin Gibbons	_{uint8array-base64}	_{February 2024}
Dynamic Code Brand Checks	Nicolò Ribaudo	Krzysztof Kotowicz Mike Samuel Nicolò Ribaudo	❓	_April 2024
Redeclarable global `eval`-introduced `var`s	Shu-yu Guo	Shu-yu Guo	_{Testing plan}	_April 2024
`Atomics.pause`	Shu-yu Guo	Shu-yu Guo	_{Atomics.pause}	_{October 2024}
`Error.isError`	Jordan Harband	Jordan Harband	_{Error.isError}	_{December 2024}
Deferring Module Evaluation	Yulia Startsev Guy Bedford	Yulia Startsev Guy Bedford Nicolò Ribaudo	_{Testing plan}	_{February 2025}
`Math.sumPrecise`	Kevin Gibbons	Kevin Gibbons	_{Math.sumPrecise}	_{October 2024}

Stage 2.7

Proposal	Author	Champion	_{Test262 Feature Flag}	_{Last Presented}
ShadowRealm	Caridy Patiño Jean-Francois Paradis	Dave Herman Mark Miller Caridy Patiño Leo Balter Rick Waldron Chengzhong Wu	_ShadowRealm	_{February 2024}
Joint Iteration	Michael Ficarra	Michael Ficarra	_{Testing plan}	_June 2024
Iterator Sequencing	Michael Ficarra	Michael Ficarra	❓	_{October 2024}
ESM Phase Imports	Luca Casonato Guy Bedford	Luca Casonato Guy Bedford	❓	_{December 2024}
Immutable ArrayBuffers	Mark Miller Peter Hoddie Richard Gibson Jack Works	Mark Miller Peter Hoddie Richard Gibson Jack Works	❓	_{February 2025}

Stage 2

Proposal	Author	Champion	Stage 2.7 reviewers	_{Last Presented}
`function.sent` metaproperty	Allen Wirfs-Brock	HE Shi-Jun		_July 2019
`throw` expressions	Ron Buckton	Ron Buckton		_{February 2024}
Function implementation hiding	Domenic Denicola Michael Ficarra	Michael Ficarra		_June 2020
collection normalization	Bradley Farias	Bradley Farias		_{January 2019}
isTemplateObject	Mike Samuel, Krzysztof Kotowicz	Daniel Ehrenberg Jordan Harband		_April 2024
`Upsert`	Daniel Minor, Lauritz Thoresen Angeltveit, Jonas Haukenes, Sune Lianes, Vetle Larsen, Mathias Hop Ness	Daniel Minor	Michael Ficarra Jesse Alama	_{December 2024}
Dynamic Import Host Adjustment	Mike Samuel, Krzysztof Kotowicz	Krzysztof Kotowicz		_{December 2019}
Record & Tuple	Robin Ricard Richard Button	Robin Ricard Richard Button		_April 2024
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}
String.dedent	Misha Kaletsky Hemanth HM Justin Ridgewell	Hemanth HM Justin Ridgewell		_June 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		_May 2023
Async Iterator helpers	Gus Caplan	Michael Ficarra Jonathan Keslin Kevin Gibbons		_June 2024
Iterator.range	Jack Works	Jack Works		_April 2024
Async Context	Chengzhong Wu	Andreu Botella Chengzhong Wu Justin Ridgewell	James M Snell Mark S. Miller	_April 2024
"Discard" (`void`) Bindings	Ron Buckton	Ron Buckton		_June 2024
Propagate active ScriptOrModule with JobCallback Record	Chengzhong Wu	Chengzhong Wu		_July 2024
Structs: Fixed Layout Objects and Some Synchronization Primitives	Shu-yu Guo	Shu-yu Guo	Mark Miller Waldemar Horwat Yulia Startsev Nicolò Ribaudo	_{October 2024}
Extractors	Ron Buckton	Ron Buckton	Jordan Harband Justin Ridgewell	_{October 2024}
iterator chunking	Michael Ficarra	Michael Ficarra	Ashley Claymore Jordan Harband Jesse Alama	_{October 2024}
Error Stack Accessor	Jordan Harband	Jordan Harband Mark Miller	Nicolò Ribaudo Michael Ficarra	_{February 2025}

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!).

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