# Technical Documentation: tc39/proposals > ℹ️ **Provenance:** Multi-Tier Ingestion · [CodeWiki Reference](https://codewiki.google/github.com/tc39/proposals) ### Overview (`README.md`) # [ECMAScript](https://github.com/tc39/ecma262) proposals * [Stage 1 Proposals](stage-1-proposals.md) * [Stage 0 Proposals](stage-0-proposals.md) * [Finished Proposals](finished-proposals.md) * [Inactive Proposals](inactive-proposals.md) [ECMAScript Internationalization API Specification](ecma402/README.md) proposals [Contributing to proposals](#contributing-to-proposals) ## Active proposals Proposals follow [this process document](https://tc39.es/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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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 | Meeting Notes | | ------------------------------------------------------------------------------ | ----------------------------------------------------------------------- | ----------------------------------------------------------------------- | ------------------------------------------------------------------- | ---------------------------------------------------------- | | [Legacy RegExp features in JavaScript][regexp-legacy] | Claude Pache | Mark Miller
Claude Pache | [legacy-regexp][tests-regexp-legacy] |  -[2026‑01][regexp-legacy-notes-2026-01]
 -[2024‑06][regexp-legacy-notes-2024-06]
 -[2023‑07][regexp-legacy-notes-2023-07]
 -[2017‑05][regexp-legacy-notes]
 -[2017‑05][regexp-legacy-notes-2017-05]
 -[2017‑03][regexp-legacy-notes-2017-03]
 -[2016‑09][regexp-legacy-notes-2016-09] | | [Source Phase Imports][source-phase-imports] | Luca Casonato | Guy Bedford
Luca Casonato | [source-phase-imports][source-phase-imports-tests] |  -[2026‑05][source-phase-imports-notes-2026-05]
 -[2026‑01][source-phase-imports-notes-2026-01]
 -[2024‑10][source-phase-imports-notes]
 -[2024‑07][source-phase-imports-notes-2024-07]
 -[2024‑06][source-phase-imports-notes-2024-06]
 -[2023‑07][source-phase-imports-notes-2023-07]
 -[2023‑05][source-phase-imports-notes-2023-05]
 -[2023‑05][source-phase-imports-notes-2023-05-15]
 -[2023‑03][source-phase-imports-notes-2023-03] | | [Dynamic Code Brand Checks][dynamic-code-brand-checks] | Nicolo Ribaudo | Krzysztof Kotowicz
Mike Samuel
Nicolo Ribaudo | [No test262 tests][dynamic-code-brand-checks-no-tests] |  -[2026‑05][dynamic-code-brand-checks-notes-2026-05]
 -[2026‑01][dynamic-code-brand-checks-notes-2026-01]
 -[2024‑06][dynamic-code-brand-checks-notes-2024-06]
 -[2024‑04][dynamic-code-brand-checks-notes-2024-04]
 -[2021‑01][dynamic-code-brand-checks-notes-2021-01]
 -[2019‑12][dynamic-code-brand-checks-notes]
 -[2019‑07][dynamic-code-brand-checks-notes-2019-07] | | [Deferring Module Evaluation][lazy-import] | Yulia Startsev
Guy Bedford | Nicolò Ribaudo | [import-defer][lazy-import-tests] [testing plan][lazy-import-testplan] |  -[2026‑07][lazy-import-notes-2026-07]
 -[2026‑03][lazy-import-notes-2026-03]
 -[2025‑02][lazy-import-notes]
 -[2024‑12][lazy-import-notes-2024-12]
 -[2024‑12][lazy-import-notes-2024-12-03]
 -[2024‑10][lazy-import-notes-2024-10]
 -[2024‑06][lazy-import-notes-2024-06]
 -[2024‑04][lazy-import-notes-2024-04]
 -[2023‑07][lazy-import-notes-2023-07]
 -[2022‑11][lazy-import-notes-2022-11]
 -[2021‑01][lazy-import-notes-2021-01] | | [Non-extensible Applies to Private][nonext-private] | Mark Miller
Shu-yu Guo
Chip Morningstar
Erik Marks | Mark Miller
Shu-yu Guo
Chip Morningstar
Erik Marks | [nonextensible-applies-to-private][nonext-private-tests] |  -[2025‑09][nonext-private-notes]
 -[2025‑07][nonext-private-notes-2025-07]
 -[2025‑04][nonext-private-notes-2025-04] | | [Import Text][import-text] | Eemeli Aro | Eemeli Aro | [import-text][import-text-tests] |  -[2026‑03][import-text-notes-2026-03]
 -[2025‑11][import-text-notes] | | [Error Stack Accessor][stack-accessor] | Jordan Harband | Jordan Harband
Mark Miller | [tests PR][stack-accessor-tests] |  -[2026‑05][stack-accessor-notes-2026-05]
 -[2026‑03][stack-accessor-notes-2026-03]
 -[2025‑11][stack-accessor-notes]
 -[2025‑02][stack-accessor-notes-2025-02] | | [RegExp Buffer Boundaries (`\A`, `\z`, `\Z`)][regexp-buffer-boundaries] | Ron Buckton | Ron Buckton | [tests PR][buffer-boundaries-tests] |  -[2026‑05][regexp-buffer-boundaries-notes-2026-05]
 -[2026‑03][regexp-buffer-boundaries-notes-2026-03]
 -[2026‑01][regexp-buffer-boundaries-notes-2026-01]
 -[2023‑07][regexp-buffer-boundaries-notes-2023-07]
 -[2021‑12][regexp-buffer-boundaries-notes]
 -[2021‑10][regexp-buffer-boundaries-notes-2021-10] | | [Await Dictionary][await-dictionary] | Alexander J. Vincent | Ashley Claymore
Jordan Harband
Chris de Almeida | [await-dictionary][await-dictionary-tests] tests [1][await-dictionary-tests-1] [2][await-dictionary-tests-2] |  -[2026‑07][await-dictionary-notes-2026-07]
 -[2025‑11][await-dictionary-notes-2025-11]
 -[2025‑09][await-dictionary-notes-2025-09]
 -[2023‑03][await-dictionary-notes-2023-03] | | [Curtailing the power of "Thenables"][thenables] | Matthew Gaudet | Matthew Gaudet | :question: |  -2026‑09
 -2026‑09
 -[2026‑07][thenables-notes-2026-07-22]
 -[2026‑07][thenables-notes-2026-07-20]
 -[2026‑05][thenables-notes-2026-05]
 -[2026‑03][thenables-notes-2026-03]
 -[2025‑07][thenables-notes-2025-07]
 -[2025‑02][thenables-notes] | ### Stage 2.7 | Proposal | Author | Champion | Test262 Feature Flag | Meeting Notes | | ------------------------------------------------------------------------------ | ----------------------------------------------------------------------- | ----------------------------------------------------------------------- | ------------------------------------------------------------------- | ---------------------------------------------------------- | | [Decorators][decorators] | Daniel Ehrenberg
Kristen Hewell Garrett | Kristen Hewell Garrett | [decorators][decorators-tests] [testing plan][decorators-testplan] |  -[2026‑05][decorators-notes-2026-05]
 -[2025‑11][decorators-notes-2025-11]
 -[2025‑02][decorators-notes]
 -[2024‑06][decorators-notes-2024-06]
 -[2023‑11][decorators-notes-2023-11]
 -[2023‑05][decorators-notes-2023-05]
 -[2023‑03][decorators-notes-2023-03]
 -[2023‑01][decorators-notes-2023-01]
 -[2023‑01][decorators-notes-2023-01-01]
 -[2022‑06][decorators-notes-2022-06]
 -[2022‑03][decorators-notes-2022-03]
 -[2022‑03][decorators-notes-2022-03-31]
 -[2022‑03][decorators-notes-2022-03-30]
 -[2021‑12][decorators-notes-2021-12]
 -[2021‑07][decorators-notes-2021-07]
 -[2020‑09][decorators-notes-2020-09]
 -[2020‑07][decorators-notes-2020-07]
 -[2020‑06][decorators-notes-2020-06]
 -[2020‑03][decorators-notes-2020-03]
 -[2019‑03][decorators-notes-2019-03-27]
 -[2019‑01][decorators-notes-2019-01]
 -[2018‑11][decorators-notes-2018-11]
 -[2018‑09][decorators-notes-2018-09]
 -[2018‑07][decorators-notes-2018-07]
 -[2018‑05][decorators-notes-2018-05]
 -[2018‑03][decorators-notes-2018-03]
 -[2018‑01][decorators-notes-2018-01]
 -[2018‑01][decorators-notes-2018-01-24]
 -[2017‑09][decorators-notes-2017-09]
 -[2017‑09][decorators-notes-2017-09-27]
 -[2017‑07][decorators-notes-2017-07]
 -[2016‑09][decorators-notes-2016-09]
 -[2016‑07][decorators-notes-2016-07]
 -[2016‑05][decorators-notes-2016-05]
 -[2016‑01][decorators-notes-2016-01]
 -[2015‑09][decorators-notes-2015-09]
 -[2015‑05][decorators-notes-2015-05]
 -[2015‑03][decorators-notes-2015-03]
 -[2015‑01][decorators-notes-2015-01]
 -[2014‑04][decorators-notes-2014-04] | | [Decorator Metadata][decorator-metadata] | Kristen Hewell Garrett | Kristen Hewell Garrett | [decorator-metadata][decorator-metadata-tests] |  -[2026‑05][decorator-metadata-notes-2026-05]
 -[2024‑06][decorator-metadata-notes-2024-06]
 -[2023‑05][decorator-metadata-notes]
 -[2023‑05][decorator-metadata-notes-2023-05]
 -[2023‑03][decorator-metadata-notes-2023-03] | | [ShadowRealm][shadowrealm] | Caridy Patiño
Jean-Francois Paradis | Dave Herman
Mark Miller
Caridy Patiño
Leo Balter
Rick Waldron
Chengzhong Wu | [ShadowRealm][realms-tests] |  -[2025‑02][realms-notes]
 -[2025‑02][realms-notes-2025-02]
 -[2024‑12][realms-notes-2024-12]
 -[2024‑06][realms-notes-2024-06]
 -[2024‑02][realms-notes-2024-02]
 -[2023‑11][realms-notes-2023-11]
 -[2023‑09][realms-notes-2023-09]
 -[2022‑11][realms-notes-2022-11]
 -[2022‑09][realms-notes-2022-09]
 -[2022‑06][realms-notes-2022-06]
 -[2022‑03][realms-notes-2022-03]
 -[2021‑12][realms-notes-2021-12]
 -[2021‑08][realms-notes-2021-08]
 -[2021‑07][realms-notes-2021-07]
 -[2021‑05][realms-notes-2021-05]
 -[2021‑04][realms-notes-2021-04]
 -[2021‑01][realms-notes-2021-01]
 -[2020‑11][realms-notes-2020-11]
 -[2020‑06][realms-notes-2020-06]
 -[2020‑02][realms-notes-2020-02]
 -[2018‑07][realms-notes-2018-07]
 -[2018‑05][realms-notes-2018-05]
 -[2017‑03][realms-notes-2017-03]
 -[2017‑01][realms-notes-2017-01]
 -[2015‑05][realms-notes-2015-05]
 -[2014‑06][realms-notes-2014-06]
 -[2014‑01][realms-notes-2014-01] | | [ESM Phase Imports][esm-phase] | Luca Casonato
Guy Bedford | Luca Casonato
Guy Bedford | :question: |  -[2026‑05][esm-phase-notes-2026-05]
 -[2026‑03][esm-phase-notes-2026-03]
 -[2024‑12][esm-phase-notes]
 -[2024‑12][esm-phase-notes-2024-12]
 -[2024‑10][esm-phase-notes-2024-10]
 -[2024‑06][esm-phase-notes-2024-06]
 -[2024‑04][esm-phase-notes-2024-04]
 -[2024‑02][esm-phase-notes-2024-02] | | [Immutable ArrayBuffers][immutable-abs] | Mark Miller
Peter Hoddie
Richard Gibson
Jack Works | Mark Miller
Peter Hoddie
Richard Gibson
Jack Works | :question: |  -[2025‑07][immutable-abs-notes]
 -[2025‑05][immutable-abs-notes-2025-05]
 -[2025‑04][immutable-abs-notes-2025-04]
 -[2025‑02][immutable-abs-notes-2025-02]
 -[2024‑12][immutable-abs-notes-2024-12]
 -[2024‑10][immutable-abs-notes-2024-10] | | [Import Bytes][import-bytes] | Steven Salat | Steven Salat | [Import Bytes][import-bytes-tests] |  -[2025‑09][import-bytes-notes] | | [JSON.parse options][json-parse-immutable] | Robin Ricard
Richard Button
Nicolò Ribaudo
Ashley Claymore | Nicolò Ribaudo
Ashley Claymore
Peter Klecha | :question: |  -[2026‑07][json-parse-immutable-notes-2026-07]
 -[2026‑03][json-parse-immutable-notes-2026-03]
 -[2023‑07][json-parse-immutable-notes-2023-07]
 -[2022‑07][json-parse-immutable-notes] | | [export all from][export-all-from] | Guy Bedford | Nicolò Ribaudo | :question: |  -2026‑09
 -[2026‑05][export-all-from-notes-2026-05] | | [Deferred Re-exports][deferred-reexport] | Nicolò Ribaudo | Nicolò Ribaudo | :question: |  -2026‑09
 -[2026‑05][deferred-reexport-notes-2026-05]
 -[2026‑01][deferred-reexport-notes-2026-01]
 -[2025‑11][deferred-reexport-notes-2025-11]
 -[2025‑09][deferred-reexport-notes-2025-09]
 -[2025‑04][deferred-reexport-notes]
 -[2024‑04][deferred-reexport-notes-2024-04] | ### Stage 2 | Proposal | Author | Champion | Stage 2.7 reviewers | Meeting Notes | | ------------------------------------------------------------------------------ | ----------------------------------------------------- | --------------------------------------------------------------------------------- | ------------------------------------------ | --------------------------------------------------------------------- | | [`function.sent` metaproperty][function-sent] | Allen Wirfs-Brock | | Daniel Ehrenberg
Domenic Denicola |  -[2026-01][function-sent-notes-2026-01]
 -[2026‑01][function-sent-notes-2026-01-21]
 -[2024‑06][function-sent-notes-2024-06]
 -[2022‑06][function-sent-notes-2022-06]
 -[2019‑07][function-sent-notes]
 -[2018‑03][function-sent-notes-2018-03]
 -[2015‑11][function-sent-notes-2015-11]
 -[2015‑11][function-sent-notes-2015-11-18] | | [`throw` expressions][throw-expressions] | Ron Buckton | Ron Buckton | Nicolò Ribaudo |  -[2024‑06][throw-expressions-notes-2024-06]
 -[2024‑02][throw-expressions-notes]
 -[2023‑09][throw-expressions-notes-2023-09]
 -[2023‑09][throw-expressions-notes-2023-09-26]
 -[2023‑07][throw-expressions-notes-2023-07]
 -[2018‑01][throw-expressions-notes-2018-01]
 -[2017‑11][throw-expressions-notes-2017-11]
 -[2017‑09][throw-expressions-notes-2017-09]
 -[2017‑07][throw-expressions-notes-2017-07] | | [Function implementation hiding][censorship] | Domenic Denicola
Michael Ficarra | Michael Ficarra | Yehuda Katz
Waldemar Horwat
Mike Samuel |  -[2026‑01][censorship-notes-2026-01]
 -[2024‑06][censorship-notes-2024-06]
 -[2023‑07][censorship-notes-2023-07]
 -[2020‑06][censorship-notes]
 -[2019‑12][censorship-notes-2019-12]
 -[2019‑07][censorship-notes-2019-07]
 -[2018‑05][censorship-notes-2018-05] | | [collection normalization][collection-rekey] | Bradley Farias | | Michael Ficarra
Ashley Claymore
Jordan Harband |  -[2026‑01][collection-rekey-notes-2026-01]
 -[2021‑03][collection-rekey-notes-2021-03]
 -[2019‑07][collection-rekey-notes-2019-07]
 -[2019‑01][richer-keys-notes] | | [Module Expressions][module-expressions] | Surma
Daniel Ehrenberg
Nicolò Ribaudo | Surma
Nicolò Ribaudo | Leo Balter
Guy Bedford
Mathieu Hofman
Jordan Harband |  -[2022‑11][module-expressions-notes] | | [Pipeline Operator][pipeline] | J. S. Choi
James DiGioia
Ron Buckton
Tab Atkins | J. S. Choi
Ron Buckton
Tab Atkins | Ross Kirsling
Christian Ulbrich |  -[2026‑01][pipe-notes-2026-01]
 -[2023‑07][pipe-notes-2023-07]
 -[2022‑03][pipe-notes-2022-03]
 -[2022‑01][pipe-notes-2022-01]
 -[2021‑08][pipe-notes]
 -[2021‑03][pipe-notes-2021-03]
 -[2018‑03][pipe-notes-2018-03]
 -[2017‑11][pipe-notes-2017-11]
 -[2017‑09][pipe-notes-2017-09] | | [Destructure Private Fields][destructure-private] | Justin Ridgewell | Kevin Gibbons | Robin Ricard
Waldemar Horwat
Sarah Groff Hennigh-Palermo
Jordan Harband
Sergey Rubanov |  -[2026‑01][destructure-private-notes-2026-01]
 -[2023‑07][destructure-private-notes-2023-07]
 -[2021‑12][destructure-private-notes] | | [String.dedent][string.dedent] | Misha Kaletsky
Hemanth HM
Justin Ridgewell | Hemanth HM
Justin Ridgewell | Robin Ricard
Jordan Harband
Mark Cohen
Sarah Groff Hennigh-Palermo |  -[2026‑01][string.dedent-notes-2026-01]
 -[2022‑11][string.dedent-notes-2022-11]
 -[2022‑09][string.dedent-notes-2022-09]
 -[2022‑06][string.dedent-notes]
 -[2020‑09][string.dedent-notes-2020-09] | | [Module Declarations][module-declarations] | Daniel Ehrenberg
Nicolò Ribaudo | Mark Miller
Nicolò Ribaudo | Richard Gibson
Guy Bedford |  -[2022‑11][module-declarations-notes] | | [Symbol Predicates][symbol-predicates] | Robin Ricard
Jordan Harband | Ashley Claymore
Jordan Harband | Daniel Minor
Nicolò Ribaudo
Mathieu Hofman |  -[2026‑01][symbol-predicates-notes-2026-01]
 -[2023‑09][symbol-predicates-notes-2023-09]
 -[2023‑05][symbol-predicates-notes]
 -[2023‑01][symbol-predicates-notes-2023-01]
 -[2022‑07][symbol-predicates-notes-2022-07] | | [Async Iterator helpers][async-iterator-helpers] | Gus Caplan | Michael Ficarra
Jonathan Keslin
Kevin Gibbons | Richard Gibson
Yulia Startsev
Jason Orendorff |  -[2026‑07][async-iterator-helpers-notes-2026-07-22]
 -[2026‑07][async-iterator-helpers-notes-2026-07-21]
 -[2025‑11][async-iterator-helpers-notes]
 -[2024‑06][async-iterator-helpers-notes-2024-06]
 -[2023‑09][async-iterator-helpers-notes-2023-09]
 -[2023‑05][async-iterator-helpers-notes-2023-05] | | [Iterator.range][iterator-range] | Jack Works | Jack Works | Waldemar Horwat
Jordan Harband |  -[2026‑01][iterator-range-notes-2026-01]
 -[2024‑04][iterator-range-notes]
 -[2023‑03][iterator-range-notes-2023-03] | | [Async Context][async-context] | Chengzhong Wu | Andreu Botella
Chengzhong Wu
Justin Ridgewell | James M Snell
Mark S. Miller |  -[2026‑05][async-context-notes-2026-05]
 -[2025‑09][async-context-notes]
 -[2025‑07][async-context-notes-2025-07]
 -[2025‑05][async-context-notes-2025-05]
 -[2025‑04][async-context-notes-2025-04]
 -[2024‑12][async-context-notes-2024-12]
 -[2024‑10][async-context-notes-2024-10]
 -[2024‑04][async-context-notes-2024-04]
 -[2023‑09][async-context-notes-2023-09]
 -[2023‑05][async-context-notes-2023-05]
 -[2023‑03][async-context-notes-2023-03]
 -[2023‑02][async-context-notes-2023-02]
 -[2020‑07][async-context-notes-2020-07]
 -[2020‑06][async-context-notes-2020-06] | | ["Discard" (`void`) Bindings][discards] | Ron Buckton | Ron Buckton | Ashley Claymore
Oliver Medhurst |  -[2026‑01][discards-notes-2026-01]
 -[2024‑10][discards-notes-2024-10]
 -[2024‑10][discards-notes-2024-10-09]
 -[2024‑06][discards-notes]
 -[2024‑04][discards-notes-2024-04]
 -[2024‑02][discards-notes-2024-02] | | [Propagate active ScriptOrModule with JobCallback Record][scriptormodule] | Chengzhong Wu | Chengzhong Wu | Nicolò Ribaudo
Chris de Almeida |  -[2026‑01][scriptormodule-notes-2026-01]
 -[2024‑07][scriptormodule-notes] | | [Structs: Fixed Layout Objects and Some Synchronization Primitives][structs] | Shu-yu Guo | Shu-yu Guo | Mark Miller
Waldemar Horwat
Yulia Startsev
Nicolò Ribaudo |  -[2024‑10][structs-notes]
 -[2024‑06][structs-notes-2024-06]
 -[2024‑04][structs-notes-2024-04]
 -[2024‑02][structs-notes-2024-02]
 -[2023‑03][structs-notes-2023-03] | | [Extractors][extractors] | Ron Buckton | Ron Buckton | Jordan Harband
Justin Ridgewell |  -[2024‑10][extractors-notes]
 -[2024‑04][extractors-notes-2024-04]
 -[2024‑02][extractors-notes-2024-02] | | [SeededPRNG][seeded-randoms] | Tab Atkins | Tab Atkins | Kevin Gibbons
Jesse Alama
Mark Miller |  -[2025‑05][seeded-randoms-notes]
 -[2025‑05][seeded-randoms-notes-2025-05] | | [`Math.clamp`][clamp] | Oliver Medhurst | Oliver Medhurst | Jordan Harband |  -[2025‑05][clamp-notes]
 -[2025‑02][clamp-notes-2025-02] | | [Native Promise Predicate][native-promise-predicate] | Mathieu Hofman | Mathieu Hofman | Jordan Harband
James Snell
Justin Ridgewell |  -[2025‑09][native-promise-predicate-notes] | | [`Error.captureStackTrace`][capturestacktrace] | Matthew Gaudet | Matthew Gaudet
Dan Minor | Jordan Harband
Michael Ficarra |  -[2025‑11][capturestacktrace-notes-2025-11]
 -[2025‑07][capturestacktrace-notes-2025-07]
 -[2025‑02][capturestacktrace-notes] | | [`Object.keysLength`][keyslength] | Ruben Bridgewater
Jordan Harband | Ruben Bridgewater
Jordan Harband | Eemeli Aro
James Snell |  -[2025‑07][keyslength-notes-2025-07] | | [Sync Imports][import-sync] | Guy Bedford | Guy Bedford | Nicolò Ribaudo
James Snell |  -[2026‑01][import-sync-notes]
 -[2024‑12][import-sync-notes-2024-12] | | [Amount][amount] | Ben Allen | Ben Allen | Waldemar Horwat
Jordan Harband |  -[2026‑07][amount-notes-2026-07]
 -[2026‑05][amount-notes-2026-05]
 -[2026‑03][amount-notes-2026-03]
 -[2025‑11][amount-notes-2025-11]
 -[2025‑09][amount-notes]
 -[2025‑09][amount-notes-2025-09] | | [Error code property][error-code] | James Snell | James Snell | Jordan Harband
Richard Gibson |  -[2026‑07][error-code-notes-2026-07-2]
 -[2026‑07][error-code-notes-2026-07]
 -[2026‑03][error-code-notes-2026-03] | | [Fused Multiply-Add][math-fma] | Waldemar Horwat | Waldemar Horwat | Jordan Harband
Michael Ficarra |  -[2026‑07][math-fma-notes-2025-07] | | [Bigint from exponential][bigint-exp] | Richard Gibson | Richard Gibson | Michael Ficarra
Ruben Bridgewater |  -2026‑09
 -[2026‑07][bigint-exp-notes-2026-07-22]
 -[2026‑07][bigint-exp-notes-2026-07-20] | | [`Composites`][composite] | Ashley Claymore | Ashley Claymore | Jordan Harband
Michael Ficarra
Ross Kirsling |  -2026‑09
 -[2026‑07][composite-notes-2026-07]
 -[2025‑11][composite-notes-2025-11]
 -[2025‑11][composite-notes-2025-11-20]
 -[2025‑04][composite-notes] | The test262 feature flag links to a code search of tests using that feature flag, which may constitute complete or partial coverage. The :question: means there is no feature flag for tests yet. ## Contributing to proposals See [Contributing to ECMAScript](https://github.com/tc39/ecma262/blob/HEAD/CONTRIBUTING.md) and [How We Work](https://github.com/tc39/how-we-work/blob/main/README.md#proposals) 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](https://github.com/tc39) for discoverability and archival purposes. To onboard a proposal: 1. Transfer your repository to the [@tc39-transfer](http://github.com/tc39-transfer) organization * if you are a TC39 delegate, but not a member of that organization, please contact [@LJHarb](https://github.com/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!). [regexp-legacy]: https://github.com/tc39/proposal-regexp-legacy-features [regexp-legacy-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2017-05/may-25.md#15ia-regexp-legacy-features-for-stage-3 [regexp-legacy-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#legacy-regexp-features-in-javascript [regexp-legacy-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-11.md#legacy-regex-features [regexp-legacy-notes-2017-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2017-05/may-23.md#16ia-regexp-legacy-features-for-stage-3 [regexp-legacy-notes-2017-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2017-03/mar-21.md#10ie-regexp-legacy-features-for-stage-3 [regexp-legacy-notes-2023-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-07/july-12.md#legacy-regex-features [regexp-legacy-notes-2016-09]: https://github.com/tc39/notes/blob/HEAD/meetings/2016-09/sept-27.md#102a-legacy-regexp-features [tests-regexp-legacy]: https://github.com/tc39/test262/search?l=JavaScript&q=legacy-regexp [function-sent]: https://github.com/tc39/proposal-function.sent [function-sent-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2019-07/july-23.md#making-functionsent-inactive [decorators]: https://github.com/tc39/proposal-decorators [decorators-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-02/february-18.md#decorators-implementation-updates [decorators-tests]: https://github.com/tc39/test262/search?l=JavaScript&q=decorators [decorators-testplan]: https://github.com/tc39/test262/issues/4042 [shadowrealm]: https://github.com/tc39/proposal-shadowrealm [realms-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-02/february-18.md#shadowrealm-status-update [realms-notes-2025-02]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-02/february-19.md#use-cases-for-shadowrealm [realms-notes-2024-12]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-12/december-02.md#shadowrealm-for-stage-3 [realms-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-12.md#shadowrealm-update [realms-notes-2024-02]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-02/feb-7.md#shadowrealms-update [realms-notes-2023-11]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-11/november-27.md#shadowrealm-stage-2-update [realms-notes-2023-09]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-09/september-27.md#shadowrealm-implementer-feedback-and-demotion-to-stage-2 [realms-notes-2022-11]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-11/dec-01.md#shadowrealm [realms-notes-2022-09]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-09/sep-13.md#shadowrealm-update [realms-notes-2022-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-06/jun-06.md#shadowrealm-implementation-status-and-normate-updates [realms-notes-2022-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-03/mar-29.md#shadowrealms-updates [realms-notes-2021-12]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-12/dec-14.md#shadowrealms-updates-and-potential-normative-changes [realms-notes-2021-08]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-08/aug-31.md#realms-renaming-bikeshedding-thread [realms-notes-2021-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-07/july-13.md#realms-for-stage-3 [realms-notes-2021-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-05/may-26.md#realms [realms-notes-2021-04]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-04/apr-21.md#isolated-realms-update [realms-notes-2021-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-01/jan-26.md#realms-update [realms-notes-2020-11]: https://github.com/tc39/notes/blob/HEAD/meetings/2020-11/nov-17.md#realms-for-stage-3 [realms-notes-2020-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2020-06/june-4.md#realms-stage-2-update [realms-notes-2020-02]: https://github.com/tc39/notes/blob/HEAD/meetings/2020-02/february-5.md#update-on-realms [realms-notes-2018-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2018-07/july-24.md#report-on-realms-shim-security-review [realms-notes-2018-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2018-05/may-23.md#realms [realms-notes-2017-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2017-03/mar-23.md#10iic-realms-update [realms-notes-2017-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2017-01/jan-26.md#13iid-seeking-stage-1-for-realms [realms-notes-2015-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2015-05/may-29.md#fresh-realms-breakout [realms-notes-2014-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2014-06/jun-4.md#47-removal-of-realms-api-from-es6-postponement-to-es7 [realms-notes-2014-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2014-01/jan-29.md#security-review-for-loadersrealms [realms-tests]: https://github.com/tc39/test262/search?l=JavaScript&q=ShadowRealm [throw-expressions]: https://github.com/tc39/proposal-throw-expressions [throw-expressions-notes]: https://github.com/tc39/notes/blob/main/meetings/2024-02/feb-8.md#throw-expressions-update-or-stage-27 [censorship]: https://github.com/tc39/proposal-function-implementation-hiding [censorship-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2020-06/june-2.md#function-implementation-hiding-for-stage-3 [censorship-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-11.md#function-implementation-hiding [censorship-notes-2019-12]: https://github.com/tc39/notes/blob/HEAD/meetings/2019-12/december-4.md#update-on-function-implementation-hiding [censorship-notes-2019-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2019-07/july-24.md#update-on-function-implementation-hiding [censorship-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#function-implementation-hiding [censorship-notes-2023-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-07/july-13.md#function-implementation-hiding [censorship-notes-2018-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2018-05/may-24.md#functionprototypetostring-censorship-for-stage-2-continued-discussion [richer-keys-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2019-01/jan-30.md#richer-keys-for-stage-2 [collection-rekey-notes-2021-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-03/mar-9.md#collection-normalization-methods [collection-rekey-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#collection-normalization [collection-rekey-notes-2019-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2019-07/july-24.md#collection-normalization-update [async-resource-management]: https://github.com/tc39/proposal-async-explicit-resource-management [collection-rekey]: https://github.com/tc39/proposal-collection-normalization [async-iterator-helpers]: https://github.com/tc39/proposal-async-iterator-helpers [async-iterator-helpers-notes]: https://github.com/tc39/notes/blob/main/meetings/2025-11/november-19.md#async-iterator-helpers-recapupdatepolyfill [async-iterator-helpers-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-11.md#async-iterators-update [async-iterator-helpers-notes-2023-09]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-09/september-26.md#asynciterator-helper-status-update-stage-2 [async-iterator-helpers-notes-2023-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-05/may-18.md#async-iterator-stage-2-feedback-needed-on-designtradeoffs [module-expressions]: https://github.com/tc39/proposal-module-expressions [module-expressions-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-11/dec-01.md#module-expressions [pipeline]: https://github.com/tc39/proposal-pipeline-operator [pipe-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-08/aug-31.md#pipeline-operator-for-stage-2 [pipe-notes-2022-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-03/mar-29.md#bikeshedding-the-pipe-operator-topic-token [pipe-notes-2021-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-03/mar-10.md#pipeline-operator [pipe-notes-2018-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2018-03/mar-22.md#10ive-pipeline-operator [pipe-notes-2017-11]: https://github.com/tc39/notes/blob/HEAD/meetings/2017-11/nov-29.md#9iii-pipeline-operator-for-stage-2 [pipe-notes-2017-09]: https://github.com/tc39/notes/blob/HEAD/meetings/2017-09/sept-26.md#11iia-pipeline-operator [pipe-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#pipeline-operator-pt-1 [pipe-notes-2023-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-07/july-13.md#pipeline-operator [pipe-notes-2022-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-01/jan-26.md#holistic-discussion-of-tc39-dataflow-proposals [destructure-private]: https://github.com/tc39/proposal-destructuring-private [destructure-private-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-12/dec-14.md#destructuring-private-fields [destructure-private-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#destructure-private-fields [destructure-private-notes-2023-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-07/july-13.md#destructure-private-fields [regexp-buffer-boundaries]: https://github.com/tc39/proposal-regexp-buffer-boundaries [regexp-buffer-boundaries-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-12/dec-15.md#regexp-buffer-boundaries-for-stage-2 [regexp-buffer-boundaries-notes-2026-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-03/march-10.md#regexp-buffer-boundaries-for-stage-27 [regexp-buffer-boundaries-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#regexp-buffer-boundaries [regexp-buffer-boundaries-notes-2023-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-07/july-13.md#regexp-buffer-boundaries [regexp-buffer-boundaries-notes-2021-10]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-10/oct-28.md#regexp-buffer-boundaries-a-z-z-for-stage-1 [buffer-boundaries-tests]: https://github.com/tc39/test262/pull/4975 [decorator-metadata]: https://github.com/tc39/proposal-decorator-metadata [decorator-metadata-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-05/may-18.md#decorator-metadata-final-spec-text-review-for-stage-3 [decorator-metadata-notes-2023-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-03/mar-21.md#decorator-metadata-update [decorator-metadata-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-11.md#decorators-and-decorator-metadata [decorator-metadata-notes-2023-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-05/may-16.md#decorator-metadata-for-stage-3 [decorator-metadata-tests]: https://github.com/tc39/test262/pull/3971 [string.dedent]: https://github.com/tc39/proposal-string-dedent [string.dedent-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-06/jun-07.md#stringdedent [string.dedent-notes-2022-11]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-11/nov-30.md#stringdedent-for-stage-3 [string.dedent-notes-2022-09]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-09/sep-13.md#stringdedent [string.dedent-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#stringdedent [string.dedent-notes-2020-09]: https://github.com/tc39/notes/blob/HEAD/meetings/2020-09/sept-23.md#stringdedent-for-stage-1 [source-phase-imports]: https://github.com/tc39/proposal-source-phase-imports [source-phase-imports-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-10/october-08.md#source-phase-imports [source-phase-imports-notes-2023-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-07/july-12.md#source-phase-imports-for-stage-3 [source-phase-imports-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#source-phase-imports--esm-phase-imports [source-phase-imports-notes-2024-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-07/july-29.md#source-phase-imports-update [source-phase-imports-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-11.md#source-phase-imports [source-phase-imports-notes-2023-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-05/may-17.md#continuation-source-phase-imports-for-stage-3 [source-phase-imports-notes-2023-05-15]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-05/may-15.md#source-phase-imports-for-stage-3 [source-phase-imports-notes-2023-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-03/mar-22.md#import-reflection-update [source-phase-imports-tests]: https://github.com/tc39/test262/pull/3980 [json-parse-immutable]: https://github.com/tc39/proposal-json-parseimmutable [json-parse-immutable-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-07/jul-19.md#record--tuple-update [json-parse-immutable-notes-2026-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-03/march-10.md#jsonparseimmutable-update [json-parse-immutable-notes-2023-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-07/july-13.md#jsonparseimmutable [module-declarations]: https://github.com/tc39/proposal-module-declarations [module-declarations-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-11/dec-01.md#module-declarations [symbol-predicates]: https://github.com/tc39/proposal-symbol-predicates [symbol-predicates-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-05/may-15.md#symbol-predicates [symbol-predicates-notes-2023-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-01/feb-01.md#symbol-predicates [symbol-predicates-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#symbol-predicates [symbol-predicates-notes-2023-09]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-09/september-26.md#symbol-predicates-update [symbol-predicates-notes-2022-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-07/jul-20.md#symbol-predicates [iterator-range]: https://github.com/tc39/proposal-iterator.range [iterator-range-notes]: https://github.com/tc39/notes/blob/main/meetings/2024-04/april-09.md#iteratorrange-for-stage-27 [iterator-range-notes-2023-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-03/mar-22.md#iteratorrange-for-stage-2 [iterator-range-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#iteratorrange [async-context]: https://github.com/tc39/proposal-async-context [async-context-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-09/september-23.md#asynccontext-yield [lazy-import]: https://github.com/tc39/proposal-defer-import-eval [lazy-import-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-02/february-18.md#import-defer-for-stage-3 [lazy-import-notes-2024-10]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-10/october-10.md#import-defer-updates-regarding-evaluation-triggers [lazy-import-notes-2022-11]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-11/nov-30.md#deferred-module-evaluation [lazy-import-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-11.md#deferred-import-evaluation-for-stage-27 [lazy-import-notes-2023-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-07/july-11.md#deferred-import-evaluation [lazy-import-notes-2021-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-01/jan-28.md#defer-module-import-eval [lazy-import-notes-2026-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-03/march-10.md#import-defer-interaction-with-tc39ecma2623715-and-normative-pr-shield-dynamic-import-defer-against-promiseprototype-monkey-patch [lazy-import-notes-2024-12]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-12/december-05.md#continuation-import-defer-updates [lazy-import-notes-2024-12-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-12/december-03.md#import-defer-updates [lazy-import-notes-2024-04]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-04/april-09.md#deferred-import-evaluation-for-stage-27-without-tree-shakeable-exports [lazy-import-testplan]: https://github.com/tc39/test262/issues/4111 [dynamic-code-brand-checks]: https://github.com/tc39/proposal-dynamic-code-brand-checks [dynamic-code-brand-checks-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2019-12/december-5.md#dynamic-code-brand-checks-for-stage-2 [dynamic-code-brand-checks-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-11.md#eval-changes-for-trusted-types-update [dynamic-code-brand-checks-notes-2021-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-01/jan-26.md#dynamic-host-brand-checks-for-stage-2 [dynamic-code-brand-checks-notes-2019-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2019-07/july-25.md#dynamic-code-brand-checks-for-stage-2 [dynamic-code-brand-checks-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#dynamic-code-brand-checks-pt-1 [dynamic-code-brand-checks-notes-2024-04]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-04/april-10.md#evalnew-function-changes-for-trusted-types-as-normative-pr-or-stage-3 [dynamic-code-brand-checks-no-tests]: https://github.com/tc39/test262/issues/4229 [esm-phase]: https://github.com/tc39/proposal-esm-phase-imports [esm-phase-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-12/december-04.md#esm-phase-imports-for-stage-27 [discards]: https://github.com/tc39/proposal-discard-binding [discards-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-13.md#discard-bindings-update-or-stage-2 [discards-notes-2024-10]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-10/october-10.md#discard-void-bindings-request-for-stage-3-reviewers [discards-notes-2024-10-09]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-10/october-09.md#discard-void-bindings-update [discards-notes-2024-04]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-04/april-10.md#discard-bindings-for-stage-2 [discards-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#discard-void-binding--extractors--structs--throw-expressions [discards-notes-2024-02]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-02/feb-8.md#discard-void-bindings-for-stage-1 [scriptormodule]: https://github.com/tc39/proposal-jobcallback-module [scriptormodule-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-07/july-31.md#continuation-propagate-active-scriptormodule-with-jobcallback-record [scriptormodule-notes-2026-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-01/january-21.md#propagate-active-scriptormodule-with-jobcallback-record [async-it-helper-notes]: https://github.com/tc39/notes/blob/main/meetings/2024-06/june-11.md#async-iterators-update [structs]: https://github.com/tc39/proposal-structs [structs-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-10/october-08.md#structs-and-shared-structs-for-stage-2 [structs-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-13.md#shared-structs-discussion-around-methods [structs-notes-2024-04]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-04/april-11.md#shared-structs-discussion [structs-notes-2024-02]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-02/feb-7.md#wasmgc-shared-memory-proposal-and-shared-structs-proposal-convergence-update [structs-notes-2023-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-03/mar-23.md#shared-structs-update [extractors]: https://github.com/tc39/proposal-extractors [extractors-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-10/october-09.md#extractors-for-stage-2 [extractors-notes-2024-04]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-04/april-10.md#extractors-for-stage-2 [extractors-notes-2024-02]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-02/feb-7.md#extractors-update [immutable-abs]: https://github.com/tc39/proposal-immutable-arraybuffer 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https://github.com/tc39/notes/blob/HEAD/meetings/2025-09/september-22.md#amount-for-stage-2 [regexp-buffer-boundaries-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-19.md#regexp-buffer-boundaries-for-stage-27-or-3 [decorator-metadata-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-19.md#decorators-continuation-decorator-metadata-to-stage-27 [source-phase-imports-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-20.md#source-phase-imports-request-for-consensus-for-normative-change-ambiguous-re-export-handling-for-source-phase-imports [dynamic-code-brand-checks-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-19.md#dynamic-code-brand-checks-for-stage-4-or-normative-change-pr-23 [stack-accessor-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-19.md#error-stack-accessor-for-stage-3 [deferred-reexport-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-19.md#export-defer-stage-2-status-update [decorators-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-19.md#decorators-for-stage-27 [esm-phase-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-20.md#esm-phase-imports-normative-prs [async-context-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-20.md#asynccontext-stage-2-web-integration-status-update [thenables-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-20.md#thenable-curtailment-status-update [amount-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-20.md#amount-for-stage-2 [error-code]: https://github.com/tc39/proposal-error-code-property [error-code-notes-2026-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-21.md#error-code-property-for-stage-2-or-27 [error-code-notes-2026-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-03/march-11.md#error-code-property-for-stage-1-2-or-27 [math-fma]: https://github.com/tc39/proposal-fma [math-fma-notes-2025-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-22.md#fused-multiply-add-for-stage-1-or-2 [lazy-import-notes-2026-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-20.md#import-defer-stage-3-updates [async-iterator-helpers-notes-2026-07-22]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-22.md#continuation-async-iterator-helpers-open-questions [async-iterator-helpers-notes-2026-07-21]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-21.md#async-iterator-helpers-open-questions [amount-notes-2026-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-22.md#duration-units-in-amount-and-intl-sequence-units [error-code-notes-2026-07-2]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-22.md#call-for-stage-2-reviewers-for-error-code-property [json-parse-immutable-notes-2026-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-21.md#jsonparseimmutable [lazy-import-tests]: https://github.com/tc39/test262/search?q=import-defer [await-dictionary-tests]: https://github.com/tc39/test262/search?l=JavaScript&q=await-dictionary [bigint-exp]: https://github.com/tc39/proposal-bigint-from-exponential [export-all-from]: https://github.com/tc39/proposal-export-star-default [export-all-from-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-20.md#export-all-from-for-stage-1 [bigint-exp-notes-2026-07-22]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-22.md#temperature-checks-relating-to-httpsgithubcomtc39proposal-bigint-from-exponential [bigint-exp-notes-2026-07-20]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-20.md#needs-consensus-pr-support-bigint-coercion-of-integers-expressed-as-exponential-notation-strings [composite]: https://github.com/tc39/proposal-composites [composite-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-04/april-14.md#composite-keys-for-stage-1 [composite-notes-2025-11]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-11/november-19.md#composites-comparator-choice [composite-notes-2025-11-20]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-11/november-20.md#continuation-composites-comparator-choice [composite-notes-2026-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-21.md#composites-update --- ### Overview (`ecma402/README.md`) # [ECMAScript Internationalization API Specification](https://github.com/tc39/ecma402) proposals - [Stage 0 Proposals](stage-0-proposals.md) - [Finished Proposals](finished-proposals.md) - [Inactive Proposals](inactive-proposals.md) [ECMAScript](../README.md) proposals ## Active proposals Proposals follow [this process document](https://tc39.es/process-document/). This list contains only stage 1 proposals and higher that have not yet been withdrawn/rejected, or become finished. ### Stage 3 | Proposal | Author | Champion | Test262 Feature Flag | Meeting Notes | | ------------------------------------------------------------------------------ | ----------------------------------------------------------------------- | ----------------------------------------------------------------------- | ------------------------------------------------------------------- | ---------------------------------------------------------- | | [Keep trailing zeros in Intl.NumberFormat and Intl.PluralRules][trailing-zero] | Eemeli Aro | Eemeli Aro | [Intl.NumberFormat-v3][trailing-zero-tests] |  -[2026-05][trailing-zero-notes-2026-05]
 -[2026‑03][trailing-zero-notes-2026-03]
 -[2025‑11][trailing-zero-notes-2025-11]
 -[2025‑07][trailing-zero-notes-2025-07]
 -[2025‑05][trailing-zero-notes] | ### Stage 2.7 | Proposal | Author | Champion | Test262 Feature Flag | Meeting Notes | | ------------------------------------------------------------------------------ | ----------------------------------------------------------------------- | ----------------------------------------------------------------------- | ------------------------------------------------------------------- | ---------------------------------------------------------- | ### Stage 2 | Proposal | Author | Champion | Stage 2.7 reviewers | Meeting Notes | | ------------------------------------------------------------------------------ | ----------------------------------------------------- | --------------------------------------------------------------------------------- | ------------------------------------------ | --------------------------------------------------------------------- | | [eraDisplay option for `Intl.DateTimeFormat`][eradisplay] | Louis-Aime | Shane Carr, Louis-Aime | Eemeli Aro
Daniel Minor |  -[2022‑11][eradisplay-notes-2022-11]
 -[2021‑01][eradisplay-notes] | | [More Currency Display Choices][mo-money] | Eemeli Aro | Eemeli Aro | Jordan Harband
Nicolò Ribaudo |  -[2024‑12][mo-money-notes] | ### Stage 1 | Proposal | Author | Champion | Meeting Notes | | ------------------------------------------------------------ | -------------------- | ---------------------- | ---------------------------------------------------------------- | | [Smart Unit Preferences in Intl.NumberFormat][smart-units] | Younies Mahmoud | Younies Mahmoud |  -[2024‑10][smart-units-notes-2024-10]
 -[2024‑06][smart-units-notes-2024-06]
 -[2020‑06][smart-units-notes] | | [Intl LocaleMatcher][localematcher] | Long Ho | Shane Carr, Long Ho |  -[2021‑01][localematcher-notes] | | [`Intl.Segmenter v2`][Intl.Segmenter-v2] | Frank Yung-Fong Tang | Frank Yung-Fong Tang |  -[2022‑01][segmenter-v2-notes-2022-01]
 -[2021‑12][segmenter-v2-notes] | | [`Intl.MessageFormat`][intl.messageformat] | Eemeli Aro | Eemeli Aro |  -[2024‑06][messageformat-notes-2024-06]
 -[2024‑04][messageformat-notes-2024-04]
 -[2024‑02][messageformat-notes-2024-02]
 -[2024‑02][messageformat-notes-2024-02-06]
 -[2023‑09][messageformat-notes-2023-09]
 -[2022‑03][messageformat-notes] | | [`Intl.MessageResource`][intl.messageresource] | Eemeli Aro | Eemeli Aro |  -[2022‑11][messageresource-notes] | | [Intl.ZonedDateTimeFormat][intl.zoneddatetimeformat] | Frank Yung-Fong Tang | Frank Yung-Fong Tang |  -[2023‑05][zoneddatetimeformat-notes] | | [explore associating a unit with a number][unit-protocol] | Shane Carr | Shane Carr |  -[2025‑11][unit-protocol-notes] | | [Stable Formatting] [stable-formatting] | Eemeli Aro | Eemeli Aro |  -[2023‑09][stable-formatting-notes-1]
 -[2025‑02][stable-formatting-notes-2]
 -[2026‑05][stable-formatting-notes-2026-05] | | [Default Behaviours for some Intl APIs][intl-defaults] | Eemeli Aro | Eemeli Aro |  -[2026‑05][intl-defaults-notes-2026-05] | | [Intl Sequence Units][intl-sequence] | Shane Carr | Shane Carr |  -[2026‑07][intl-sequence-notes-2026-07]
 -[2026‑05][intl-sequence-notes-2026-05] | | [Intl Energy Units][intl-energy-units] | Johan Røed | Nicolò Ribaudo, Shane Carr |  -[2026‑03][intl-energy-units-notes-2026-03]
 -[2025‑11][intl-energy-units-notes-2025-11] | | [Intl.DateTimeFormat Alignment With Other Standards][intl-datetimeformat-alignment] | Eemeli Aro | Eemeli Aro |  -[2026‑07][intl-datetimeformat-alignment-notes-2026-07] | ### Contributing new proposals Please see [Contributing to ECMAScript](https://github.com/tc39/ecma262/blob/HEAD/CONTRIBUTING.md) for the most up-to-date information on contributing proposals to this standard. ### Onboarding existing proposals Proposals that are Stage 1 and above must be transferred to [the TC39 GitHub organization](https://github.com/tc39) for discoverability and archival purposes. To onboard a proposal that lives outside the TC39 organization: 1. Transfer your repository to the [@tc39-transfer](http://github.com/tc39-transfer) organization - if you are a TC39 delegate, but not an admin in that organization, please contact [@LJHarb](https://github.com/ljharb) 2. [@bterlson](https://github.com/bterlson), [@gesa](https://github.com/gesa), or [@codehag](https://github.com/codehag) 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!). [smart-units]: https://github.com/tc39/proposal-smart-unit-preferences [smart-units-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2020-06/june-4.md#smart-unit-preferences-in-intlnumberformat-for-stage-1 [smart-units-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-12.md#smart-units-progress-update [smart-units-notes-2024-10]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-10/october-10.md#smart-units-stage-1-update [eradisplay]: https://github.com/tc39/proposal-intl-eradisplay [eradisplay-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-01/jan-27.md#eradisplay-for-stage-1 [eradisplay-notes-2022-11]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-11/nov-29.md#eradisplay-option-for-intldatetimeformat [localematcher]: https://github.com/tc39/proposal-intl-localematcher [localematcher-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-01/jan-28.md#intl-localematcher-for-stage-1 [Intl.Segmenter-v2]: https://github.com/tc39/proposal-intl-segmenter-v2 [segmenter-v2-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-12/dec-15.md#intlsegmenter-v2 [segmenter-v2-notes-2022-01]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-01/jan-26.md#intlsegmenter-v2 [intl.messageformat]: https://github.com/tc39/proposal-intl-messageformat [messageformat-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-03/mar-30.md#intlmessageformat-for-stage-1 [messageformat-notes-2023-09]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-09/september-26.md#intlmessageformat-stage-1-update-and-discussion [messageformat-notes-2024-02]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-02/feb-7.md#intlmessageformat [messageformat-notes-2024-04]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-04/april-10.md#intlmessageformat-status-update [messageformat-notes-2024-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-06/june-11.md#intlmessageformat-stage-1-open-question-involving-error-handling-design-patterns [messageformat-notes-2024-02-06]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-02/feb-6.md#intlmessageformat-i-have-some-questions [intl.messageresource]: https://github.com/tc39/proposal-intl-message-resource [messageresource-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-11/nov-29.md#intl-messageresource-for-stage-1 [intl.zoneddatetimeformat]: https://github.com/tc39/proposal-intl-zoneddatetimeformat [zoneddatetimeformat-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2023-05/may-17.md#intlzoneddatetimeformat-for-stage-1 [mo-money]: https://github.com/tc39/proposal-intl-currency-display-choices [mo-money-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2024-12/december-02.md#more-currency-display-choices [trailing-zero]: https://github.com/tc39/proposal-intl-keep-trailing-zeros [trailing-zero-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-05/may-28.md#keep-trailing-zeros-in-intlnumberformat-and-intlpluralrules-for-stage-1 [trailing-zero-notes-2025-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-07/july-29.md#keep-trailing-zeros-in-intlnumberformat-and-intlpluralrules-for-stage-2-or-27 [trailing-zero-notes-2025-11]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-11/november-18.md#keep-trailing-zeros-in-intlnumberformat-and-intlpluralrules-update [trailing-zero-notes-2026-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-03/march-10.md#intl-keep-trailing-zeros-for-stage-3 [unit-protocol]: https://github.com/tc39/proposal-intl-unit-protocol [unit-protocol-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-11/november-18.md#intl-unit-protocol [stable-formatting]: https://github.com/tc39/proposal-stable-formatting [stable-formatting-notes-1]: https://github.com/tc39/notes/blob/main/meetings/2023-09/september-27.md#stable-formatting-for-stage-1 [stable-formatting-notes-2]: https://github.com/tc39/notes/blob/main/meetings/2025-02/february-19.md#stable-formatting-update [intl-defaults]: https://github.com/tc39/proposal-intl-default-behaviours [intl-sequence]: https://github.com/tc39/proposal-intl-sequence-units [intl-energy-units]: https://github.com/tc39/proposal-intl-energy-units [intl-energy-units-notes-2026-03]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-03/march-11.md#intl-energy-units-stage-1-update [intl-energy-units-notes-2025-11]: https://github.com/tc39/notes/blob/HEAD/meetings/2025-11/november-20.md#intl-energy-units-for-stage-1 [trailing-zero-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-19.md#intl-keep-trailing-zeros-for-stage-3 [stable-formatting-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-20.md#stable-formatting-for-stage-2 [intl-defaults-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-20.md#default-behaviours-for-some-intl-apis-for-stage-1 [intl-sequence-notes-2026-05]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-05/may-20.md#intl-sequence-units-for-stage-1-or-2 [intl-datetimeformat-alignment]: https://github.com/tc39/proposal-intl-datetime-alignment [intl-sequence-notes-2026-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-22.md#duration-units-in-amount-and-intl-sequence-units [intl-datetimeformat-alignment-notes-2026-07]: https://github.com/tc39/notes/blob/HEAD/meetings/2026-07/july-22.md#intldatetimeformat-alignment-with-other-standards [trailing-zero-tests]: https://github.com/tc39/test262/search?l=JavaScript&q=Intl.NumberFormat-v3 --- --- METRICS --- - Files Extracted: 2 - Estimated Token Budget: ~22037 tokens - Canonical Reference: https://codewiki.google/github.com/tc39/proposals