ECMAScript proposals

ECMAScript Internationalization API Specification 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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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	<sub>Test262 Feature Flag</sub>	<sub>Last Presented</sub>
Legacy RegExp features in JavaScript	Claude Pache	Mark Miller<br />Claude Pache	<sub>legacy-regexp</sub>	<sub>May 2017</sub>
[JSON Modules][json-modules]	Myles Borins<br />Sven Sauleau<br />Dan Clark<br />Daniel Ehrenberg	Myles Borins<br />Sven Sauleau<br />Dan Clark<br />Daniel Ehrenberg	<sub>[json-modules][json-modules-tests]</sub>	<sub>[January 2021][json-modules-notes]</sub>
Temporal	Philipp Dunkel<br />Maggie Johnson-Pint<br />Matt Johnson-Pint<br />Brian Terlson<br />Shane Carr<br />Ujjwal Sharma<br />Philip Chimento<br />Jason Williams<br />Justin Grant	Philipp Dunkel<br />Maggie Johnson-Pint<br />Matt Johnson-Pint<br />Brian Terlson<br />Shane Carr<br />Ujjwal Sharma<br />Philip Chimento<br />Jason Williams<br />Justin Grant	<sub>Temporal</sub>	<sub>July 2024</sub>
Decorators	Daniel Ehrenberg<br />Kristen Hewell Garrett	Kristen Hewell Garrett	<sub>decorators</sub>	<sub>March 2023</sub>
[JSON.parse source text access][json-parse-source]	Richard Gibson	Richard Gibson	<sub>[json-parse-with-source][json-parse-source-tests]</sub>	<sub>[January 2023][json-parse-source-notes]</sub>
[RegExp Modifiers][regexp-modifiers]	Ron Buckton	Ron Buckton	<sub>[regexp-modifiers][regexp-modifiers-tests]</sub>	<sub>[June 2022][regexp-modifiers-notes]</sub>
[`Array.fromAsync`][from-async]	J.S. Choi	J.S. Choi	<sub>[Array.fromAsync][from-async-tests]</sub>	<sub>[May 2023][from-async-notes]</sub>
[Sync Iterator helpers][iterator-helpers]	Gus Caplan	Michael Ficarra<br />Jonathan Keslin<br />Kevin Gibbons	<sub>[iterator-helpers][iterator-helpers-tests]</sub>	<sub>[November 2022][iterator-helpers-notes]</sub>
Explicit Resource Management	Ron Buckton	Ron Buckton	<sub>[explicit-resource-management][resource-management-tests]	<sub>[March 2023][resource-management-notes]</sub>
[Float16 on TypedArrays, DataView, `Math.f16round`][float16s]	Leo Balter	Leo Balter<br />Kevin Gibbons	<sub>[Float16Array][float16s-tests]</sub>	<sub>[May 2023][float16s-notes]</sub>
[Decorator Metadata][decorator-metadata]	Kristen Hewell Garrett	Kristen Hewell Garrett	<sub>[decorator-metadata][decorator-metadata-tests]</sub>	<sub>[May 2023][decorator-metadata-notes]</sub>
[Import Attributes][import-attributes]	Myles Borins<br />Sven Sauleau<br />Dan Clark<br />Daniel Ehrenberg	Sven Sauleau<br />Dan Clark<br />Daniel Ehrenberg<br />Nicolò Ribaudo	<sub>[import-attributes][import-attributes-tests]</sub>	<sub>July 2024</sub>
[Source Phase Imports][source-phase-imports]	Luca Casonato	Guy Bedford<br />Luca Casonato	<sub>[source-phase-imports][source-phase-imports-tests]</sub>	<sub>[July 2023][source-phase-imports-notes]</sub>
[Time Zone Canonicalization][time-zone-canon]	Justin Grant	Justin Grant<br />Richard Gibson	:question:	<sub>[July 2023][time-zone-canon-notes]</sub>
[Uint8Array to/from Base64][uint8array-base64]	Kevin Gibbons	Kevin Gibbons	<sub>[uint8array-base64][uint8array-base64-tests]</sub>	<sub>[February 2024][uint8array-base64-notes]</sub>
[Dynamic Code Brand Checks][dynamic-code-brand-checks]	Nicolo Ribaudo	Krzysztof Kotowicz<br />Mike Samuel<br />Nicolo Ribaudo	:question:	<sub>April 2024</sub>
[Redeclarable global `eval`-introduced `var`s][redeclarable-global-eval-vars]	Shu-yu Guo	Shu-yu Guo	:question:	<sub>[April 2024][redeclarable-global-eval-vars-notes]</sub>
[`Promise.try`][try]	Jordan Harband	Jordan Harband	<sub>[promise-try][try-tests]</sub>	<sub>[June 2024][try-notes]</sub>
[`RegExp.escape`][escape]	Domenic Denicola<br />Benjamin Gruenbaum<br />Jordan Harband	Jordan Harband<br />Kevin Gibbons	<sub>[Testing plan][escape-testplan]	<sub>July 2024</sub>

Stage 2.7

Proposal	Author	Champion	<sub>Test262 Feature Flag</sub>	<sub>Last Presented</sub>
ShadowRealm	Caridy Patiño<br />Jean-Francois Paradis	Dave Herman<br />Mark Miller<br />Caridy Patiño<br />Leo Balter<br />Rick Waldron<br />Chengzhong Wu	<sub>ShadowRealm</sub>	<sub>February 2024</sub>
[`Math.sumPrecise`][math-sum]	Kevin Gibbons	Kevin Gibbons	<sub>[Math.sumPrecise][math-sum-tests]</sub>	<sub>[April 2024][math-sum-notes]</sub>
[Deferring Module Evaluation][lazy-import]	Yulia Startsev<br />Guy Bedford	Yulia Startsev<br />Guy Bedford<br />Nicolò Ribaudo	<sub>[Testing plan][lazy-import-testplan]</sub>	<sub>[June 2024][lazy-import-notes]</sub>
[Joint Iteration][joint]	Michael Ficarra	Michael Ficarra	<sub>[Testing plan][joint-testplan]</sub>	<sub>[June 2024][joint-notes]</sub>
[`Atomics.pause`][atomics-pause]	Shu-yu Guo	Shu-yu Guo	:question:	<sub>[June 2024][atomics-pause-notes]</sub>

Stage 2

Proposal	Author	Champion	<sub>Last Presented</sub>
`function.sent` metaproperty	Allen Wirfs-Brock	HE Shi-Jun	<sub>July 2019</sub>
`throw` expressions	Ron Buckton	Ron Buckton	<sub>February 2024</sub>
Function implementation hiding	Domenic Denicola<br />Michael Ficarra	Michael Ficarra	<sub>June 2020</sub>
[collection normalization][collection-rekey]	Bradley Farias	Bradley Farias	<sub>January 2019</sub>
[isTemplateObject][isTemplateObject]	Mike Samuel, Krzysztof Kotowicz	Daniel Ehrenberg<br />Jordan Harband	<sub>[April 2024][isTemplateObject-notes]</sub>
[`Map.prototype.emplace`][map-emplace]	Bradley Farias	Erica Pramer	<sub>[July 2020][map-emplace-notes]</sub>
[Dynamic Import Host Adjustment][]	Mike Samuel, Krzysztof Kotowicz	Krzysztof Kotowicz	<sub>[December 2019][Dynamic Import Host Adjustment notes]</sub>
[Record & Tuple][record-tuple]	Robin Ricard<br />Richard Button	Robin Ricard<br />Richard Button	<sub>[April 2024][record-tuple-notes]</sub>
[Module Expressions][module-expressions]	Surma<br />Daniel Ehrenberg<br />Nicolò Ribaudo	Surma<br />Nicolò Ribaudo	<sub>[November 2022][module-expressions-notes]</sub>
[Pipeline Operator][pipeline]	J. S. Choi<br />James DiGioia<br />Ron Buckton<br />Tab Atkins	J. S. Choi<br />Ron Buckton<br />Tab Atkins	<sub>[August 2021][pipe-notes]</sub>
[Destructure Private Fields][destructure-private]	Justin Ridgewell	Justin Ridgewell	<sub>[December 2021][destructure-private-notes]</sub>
[RegExp Buffer Boundaries (`\A`, `\z`, `\Z`)][regexp-buffer-boundaries]	Ron Buckton	Ron Buckton	<sub>[December 2021][regexp-buffer-boundaries-notes]</sub>
[String.dedent][string.dedent]	Misha Kaletsky<br />Hemanth HM<br />Justin Ridgewell	Hemanth HM<br />Justin Ridgewell	<sub>[June 2022][string.dedent-notes]</sub>
[JSON.parseImmutable][json-parse-immutable]	Robin Ricard<br />Richard Button<br />Nicolò Ribaudo<br />Ashley Claymore	Robin Ricard<br />Richard Button<br />Nicolò Ribaudo<br />Ashley Claymore	<sub>[July 2022][json-parse-source-notes]</sub>
[Module Declarations][module-declarations]	Daniel Ehrenberg<br />Nicolò Ribaudo	Daniel Ehrenberg<br />Mark Miller<br />Nicolò Ribaudo	<sub>[November 2022][module-declarations-notes]</sub>
[Symbol Predicates][symbol-predicates]	Robin Ricard<br />Jordan Harband	Ashley Claymore<br />Jordan Harband	<sub>[January 2023][symbol-predicates-notes]</sub>
[Async Iterator helpers][async-iterator-helpers]	Gus Caplan	Michael Ficarra<br />Jonathan Keslin<br />Kevin Gibbons	<sub>[June 2024][async-it-helper-notes]</sub>
[Iterator.range][iterator-range]	Jack Works	Jack Works	<sub>[April 2024][iterator-range-notes]</sub>
[Async Context][async-context]	Chengzhong Wu	Andreu Botella<br />Chengzhong Wu<br />Justin Ridgewell	<sub>[April 2024][async-context-notes]</sub>
[Iterator Sequencing][sequencing]	Michael Ficarra	Michael Ficarra	<sub>[June 2024][sequencing-notes]</sub>
[`Error.isError`][is-error]	Jordan Harband	Jordan Harband	<sub>[June 2024][is-error-notes]</sub>
[ESM Phase Imports][esm-phase]	Luca Casonato<br />Guy Bedford	Luca Casonato<br />Guy Bedford	<sub>[June 2024][esm-phase-notes]</sub>
["Discard" (`void`) Bindings][discards]	Ron Buckton	Ron Buckton	<sub>[June 2024][discards-notes]</sub>
[Propagate active ScriptOrModule with JobCallback Record][scriptormodule]	Chengzhong Wu	Chengzhong Wu	<sub>July 2024</sub>

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 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:

Transfer your repository to the @tc39-transfer organization
- if you are a TC39 delegate, but not a member of that organization, please contact @LJHarb
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!).

[resource-management-notes]: