proposals

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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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
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
Float16 on TypedArrays, DataView, Math.f16round	Leo Balter	Leo Balter Kevin Gibbons	Float16Array	May 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	Nicolo Ribaudo	Krzysztof Kotowicz Mike Samuel Nicolo Ribaudo	❓	April 2024
Redeclarable global eval-introduced vars	Shu-yu Guo	Shu-yu Guo	Testing plan	April 2024
RegExp.escape	Domenic Denicola Benjamin Gruenbaum Jordan Harband	Jordan Harband Kevin Gibbons	RegExp.escape	July 2024
Atomics.pause	Shu-yu Guo	Shu-yu Guo	Atomics.pause	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
Math.sumPrecise	Kevin Gibbons	Kevin Gibbons	Math.sumPrecise testing plan	April 2024
Deferring Module Evaluation	Yulia Startsev Guy Bedford	Yulia Startsev Guy Bedford Nicolò Ribaudo	Testing plan	June 2024
Joint Iteration	Michael Ficarra	Michael Ficarra	Testing plan	June 2024
Iterator Sequencing	Michael Ficarra	Michael Ficarra	❓	October 2024
Error.isError	Jordan Harband	Jordan Harband	❓	October 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	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
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	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	April 2024
ESM Phase Imports	Luca Casonato Guy Bedford	Luca Casonato Guy Bedford	June 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	October 2024
Extractors	Ron Buckton	Ron Buckton	October 2024
iterator chunking	Michael Ficarra	Michael Ficarra	October 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!).