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ECMAScript proposals

ECMAScript Internationalization API Specification proposals

Contributing new proposals

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

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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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 Tests Last Presented
Legacy RegExp features in JavaScript Claude Pache Mark Miller
Claude Pache
May 2017
Hashbang Grammar Bradley Farias Bradley Farias November 2018
Atomics.waitAsync Lars Hansen Shu-yu Guo
Lars Hansen
December 2019
Import Assertions Myles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg
Myles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg
November 2020
JSON Modules Myles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg
Myles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg
January 2021
Error Cause Chengzhong Wu Chengzhong Wu
Hemanth HM
March 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
March 2021
Resizable and growable ArrayBuffers Shu-yu Guo Shu-yu Guo May 2021
Array find from last Wenlu Wang Wenlu Wang
Daniel Rosenwasser
July 2021
ShadowRealm Caridy Patiño
Jean-Francois Paradis
Dave Herman
Mark Miller
Caridy Patiño
Leo Balter
July 2021

Stage 2

Proposal Author Champion Last Presented
function.sent metaproperty Allen Wirfs-Brock HE Shi-Jun July 2019
Decorators Daniel Ehrenberg Yehuda Katz
Brian Terlson
Daniel Ehrenberg
Chris Garrett
July 2021
throw expressions Ron Buckton Ron Buckton January 2018
Function implementation hiding Domenic Denicola
Michael Ficarra
Michael Ficarra June 2020
New Set methods Michał Wadas
Sathya Gunasekaran
Sathya Gunasekaran January 2019
Sequence properties in Unicode property escapes Mathias Bynens Mathias Bynens October 2019
collection normalization Bradley Farias Bradley Farias January 2019
Array.isTemplateObject Mike Samuel, Krzysztof Kotowicz Krzysztof Kotowicz December 2019
Iterator helpers Gus Caplan Michael Ficarra
Jonathan Keslin
July 2020
Explicit Resource Management Ron Buckton Ron Buckton February 2020
Map.prototype.emplace Bradley Farias Erica Pramer July 2020
Dynamic Import Host Adjustment Mike Samuel, Krzysztof Kotowicz Krzysztof Kotowicz December 2019
WeakRefs cleanupSome Yulia Startsev
Daniel Ehrenberg
Yulia Startsev
Daniel Ehrenberg
July 2020
Record & Tuple Robin Ricard
Richard Button
Robin Ricard
Richard Button
September 2020
JSON.parse source text access Richard Gibson Richard Gibson July 2020
Module Blocks Surma
Daniel Ehrenberg
Surma January 2021
Symbols as WeakMap keys Daniel Ehrenberg
Richard Button
Robin Ricard
Leo Balter
Rick Waldron
Caridy Patiño
Daniel Ehrenberg
Richard Button
Robin Ricard
Leo Balter
Rick Waldron
Caridy Patiño
April 2021
Adopting Unicode behavior for set notation in regular expressions Markus Scherer
Mathias Bynens
Mathias Bynens May 2021
Change Array by copy Robin Ricard Robin Ricard August 2021
Pipeline Operator Daniel Ehrenberg
J.S. Choi
Tab Atkins
Daniel Ehrenberg
J.S. Choi
Tab Atkins
August 2021

means a pull request for tests was merged.

means there is no pull request for tests yet.

🚧 means a pull request for tests was created, but not merged yet.

Onboarding existing 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 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 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!).