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Tracking ECMAScript Proposals

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ECMAScript proposals

ECMAScript Internationalization API Specification proposals

Contributing new proposals

Please seeContributing to ECMAScript for the most up-to-date information on contributing proposals to this standard.

Active proposals

Proposals followthis process document.This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.Stage 2 indicates that the committee expects these features to be developed and eventually included in the standard.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

ProposalAuthorChampionTest262 Feature FlagLast Presented
Legacy RegExp features in JavaScriptClaude PacheMark Miller
Claude Pache
legacy-regexpMay 2017
JSON ModulesMyles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg
Myles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg
json-modulesJanuary 2021
TemporalPhilipp 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
TemporalMarch 2021
Resizable and growable ArrayBuffersShu-yu GuoShu-yu Guoresizable-arraybufferMay 2021
ShadowRealmCaridy Patiño
Jean-Francois Paradis
Dave Herman
Mark Miller
Caridy Patiño
Leo Balter
Rick Waldron
Chengzhong Wu
ShadowRealmDecember 2021
DecoratorsDaniel Ehrenberg
Chris Garrett
Chris GarrettdecoratorsMarch 2022
JSON.parse source text accessRichard GibsonRichard GibsonJune 2022
RegExp ModifiersRon BucktonRon BucktonJune 2022
Duplicate named capture groupsKevin GibbonsKevin Gibbonsregexp-duplicate-named-groupsJuly 2022
Array.fromAsyncJ.S. ChoiJ.S. ChoiArray.fromAsyncSeptember 2022
New Set methodsMichał Wadas
Sathya Gunasekaran
Kevin Gibbons
Kevin GibbonsNovember 2022
Sync Iterator helpersGus CaplanMichael Ficarra
Jonathan Keslin
Kevin Gibbons
(seeoutdated)November 2022
Explicit Resource Management andAsync Explicit Resource ManagementRon BucktonRon BucktonNovember 2022
ArrayBuffer transferShu-yu Guo
Jordan Harband
Yagiz Nizipli
Shu-yu Guo
Jordan Harband
Yagiz Nizipli
arraybuffer-transferJanuary 2023
Float16 on TypedArrays, DataView,Math.f16roundLeo BalterLeo Balter
Kevin Gibbons
May 2023
Decorator MetadataChris GarrettChris GarrettMarch 2022

Stage 2

ProposalAuthorChampionLast Presented
function.sent metapropertyAllen Wirfs-BrockHE Shi-JunJuly 2019
throw expressionsRon BucktonRon BucktonJanuary 2018
Function implementation hidingDomenic Denicola
Michael Ficarra
Michael FicarraJune 2020
Sequence properties in Unicode property escapesMathias BynensMathias BynensOctober 2019
collection normalizationBradley FariasBradley FariasJanuary 2019
Array.isTemplateObjectMike Samuel, Krzysztof KotowiczKrzysztof KotowiczDecember 2019
Map.prototype.emplaceBradley FariasErica PramerJuly 2020
Dynamic Import Host AdjustmentMike Samuel, Krzysztof KotowiczKrzysztof KotowiczDecember 2019
WeakRefscleanupSomeYulia Startsev
Daniel Ehrenberg
Yulia Startsev
Daniel Ehrenberg
July 2020
Record & TupleRobin Ricard
Richard Button
Robin Ricard
Richard Button
December 2021
Module ExpressionsSurma
Daniel Ehrenberg
Nicolò Ribaudo
Surma
Nicolò Ribaudo
November 2022
Pipeline OperatorJ. S. Choi
James DiGioia
Ron Buckton
Tab Atkins
J. S. Choi
Ron Buckton
Tab Atkins
August 2021
Destructure Private FieldsJustin RidgewellJustin RidgewellDecember 2021
RegExp Buffer Boundaries (\A,\z,\Z)Ron BucktonRon BucktonDecember 2021
String.dedentMisha Kaletsky
Hemanth HM
Justin Ridgewell
Hemanth HM
Justin Ridgewell
June 2022
Import ReflectionLuca CasonatoGuy Bedford
Luca Casonato
November 2022
JSON.parseImmutableRobin Ricard
Richard Button
Nicolò Ribaudo
Ashley Claymore
Robin Ricard
Richard Button
Nicolò Ribaudo
Ashley Claymore
July 2022
Module DeclarationsDaniel Ehrenberg
Nicolò Ribaudo
Daniel Ehrenberg
Mark Miller
Nicolò Ribaudo
November 2022
Symbol PredicatesRobin Ricard
Jordan Harband
Ashley Claymore
Jordan Harband
January 2023
Import AttributesMyles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg
Sven Sauleau
Dan Clark
Daniel Ehrenberg
Nicolò Ribaudo
January 2023
Async Iterator helpersGus CaplanMichael Ficarra
Jonathan Keslin
Kevin Gibbons
January 2023
Iterator.rangeJack WorksJack WorksMarch 2023
Async ContextChengzhong WuChengzhong Wu
Justin Ridgewell
March 2023
Time Zone CanonicalizationJustin GrantJustin Grant
Richard Gibson
May 2023
Promise.withResolversPeter KlechaPeter Klecha
Chris de Almeida
May 2023
Array GroupingJustin RidgewellJustin Ridgewell
Jordan Harband
May 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 tothe 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
  1. 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 workas 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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