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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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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
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 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
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
Float16Array May 2023
Decorator Metadata Kristen Hewell Garrett Kristen Hewell Garrett decorator-metadata May 2023
Import Attributes Myles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg
Sven Sauleau
Dan Clark
Daniel Ehrenberg
Nicolò Ribaudo
import-attributes July 2024
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
Promise.try Jordan Harband Jordan Harband promise-try June 2024
RegExp.escape Domenic Denicola
Benjamin Gruenbaum
Jordan Harband
Jordan Harband
Kevin Gibbons
Testing plan July 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
Atomics.pause Shu-yu Guo Shu-yu Guo Atomics.pause June 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
January 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
Iterator Sequencing Michael Ficarra Michael Ficarra June 2024
Error.isError Jordan Harband Jordan Harband June 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

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!).