ECMAScript proposals

• Stage 1 Proposals
• Stage 0 Proposals
• Finished Proposals
• Inactive 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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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
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
Decorators	Daniel Ehrenberg Kristen Hewell Garrett	Kristen Hewell Garrett	decorators	March 2023
JSON.parse source text access	Richard Gibson	Richard Gibson	json-parse-with-source	January 2023
RegExp Modifiers	Ron Buckton	Ron Buckton	regexp-modifiers	June 2022
Array.fromAsync	J.S. Choi	J.S. Choi	Array.fromAsync	May 2023
Sync Iterator helpers	Gus Caplan	Michael Ficarra Jonathan Keslin Kevin Gibbons	iterator-helpers	November 2022
Explicit Resource Management	Ron Buckton	Ron Buckton	explicit-resource-management	March 2023
Float16 on TypedArrays, DataView, Math.f16round	Leo Balter	Leo Balter Kevin Gibbons	❓	May 2023
Decorator Metadata	Kristen Hewell Garrett	Kristen Hewell Garrett	❓	May 2023
Import Attributes	Myles Borins Sven Sauleau Dan Clark Daniel Ehrenberg	Sven Sauleau Dan Clark Daniel Ehrenberg Nicolò Ribaudo	import-attributes	March 2023
Source Phase Imports	Luca Casonato	Guy Bedford Luca Casonato	❓	July 2023
Uint8Array to/from Base64	Kevin Gibbons	Kevin Gibbons	❓	February 2024
Dynamic Code Brand Checks	Nicolo Ribaudo	Krzysztof Kotowicz Mike Samuel</br />Nicolo Ribaudo	❓	April 2024
Redeclarable global eval-introduced vars	Shu-yu Guo	Shu-yu Guo	❓	April 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
Promise.try	Jordan Harband	Jordan Harband		April 2024
Math.sumPrecise	Kevin Gibbons	Kevin Gibbons		April 2024

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
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
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
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	January 2023
Async Iterator helpers	Gus Caplan	Michael Ficarra Jonathan Keslin Kevin Gibbons	January 2023
Iterator.range	Jack Works	Jack Works	March 2023
Async Context	Chengzhong Wu	Chengzhong Wu Justin Ridgewell	March 2023
Time Zone Canonicalization	Justin Grant	Justin Grant Richard Gibson	May 2023
Deferring Module Evaluation	Yulia Startsev Guy Bedford	Yulia Startsev Guy Bedford Nicolò Ribaudo	July 2023
RegExp.escape	Domenic Denicola Benjamin Gruenbaum Jordan Harband	Jordan Harband Kevin Gibbons	September 2023
Joint Iteration	Michael Ficarra	Michael Ficarra	February 2024

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:

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. 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!).