GitHub - tc39/proposals: Tracking ECMAScript Proposals (original) (raw)

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 This list contains only stage 2 proposals and higher that have not yet been withdrawn/rejected, or become finished.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 MillerClaude Pache legacy-regexp May 2017
Temporal Philipp DunkelMaggie Johnson-PintMatt Johnson-PintBrian TerlsonShane CarrUjjwal SharmaPhilip ChimentoJason WilliamsJustin Grant Philipp DunkelMaggie Johnson-PintMatt Johnson-PintBrian TerlsonShane CarrUjjwal SharmaPhilip ChimentoJason WilliamsJustin Grant Temporal testing plan July 2024
Decorators Daniel EhrenbergKristen 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
Array.fromAsync J.S. Choi J.S. Choi Array.fromAsync May 2023
Explicit Resource Management Ron Buckton Ron Buckton explicit-resource-management March 2023
Float16 on TypedArrays, DataView, Math.f16round Leo Balter Leo BalterKevin Gibbons Float16Array May 2023
Decorator Metadata Kristen Hewell Garrett Kristen Hewell Garrett decorator-metadata May 2023
Source Phase Imports Luca Casonato Guy BedfordLuca Casonato source-phase-imports July 2023
Time Zone Canonicalization Justin Grant Justin GrantRichard Gibson Temporal.TimeZone July 2023
Uint8Array to/from Base64 Kevin Gibbons Kevin Gibbons uint8array-base64 February 2024
Dynamic Code Brand Checks Nicolo Ribaudo Krzysztof KotowiczMike SamuelNicolo Ribaudo April 2024
Redeclarable global eval-introduced vars Shu-yu Guo Shu-yu Guo Testing plan April 2024
RegExp.escape Domenic DenicolaBenjamin GruenbaumJordan Harband Jordan HarbandKevin Gibbons Testing plan July 2024
Atomics.pause Shu-yu Guo Shu-yu Guo Atomics.pause October 2024

Stage 2.7

Proposal Author Champion Test262 Feature Flag Last Presented
ShadowRealm Caridy PatiñoJean-Francois Paradis Dave HermanMark MillerCaridy PatiñoLeo BalterRick WaldronChengzhong Wu ShadowRealm February 2024
Math.sumPrecise Kevin Gibbons Kevin Gibbons Math.sumPrecise testing plan April 2024
Deferring Module Evaluation Yulia StartsevGuy Bedford Yulia StartsevGuy BedfordNicolò Ribaudo Testing plan June 2024
Joint Iteration Michael Ficarra Michael Ficarra Testing plan June 2024
Iterator Sequencing Michael Ficarra Michael Ficarra October 2024
Error.isError Jordan Harband Jordan Harband October 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 DenicolaMichael Ficarra Michael Ficarra June 2020
collection normalization Bradley Farias Bradley Farias January 2019
isTemplateObject Mike Samuel, Krzysztof Kotowicz Daniel EhrenbergJordan 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 RicardRichard Button Robin RicardRichard Button April 2024
Module Expressions SurmaDaniel EhrenbergNicolò Ribaudo SurmaNicolò Ribaudo November 2022
Pipeline Operator J. S. ChoiJames DiGioiaRon BucktonTab Atkins J. S. ChoiRon BucktonTab 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 KaletskyHemanth HMJustin Ridgewell Hemanth HMJustin Ridgewell June 2022
JSON.parseImmutable Robin RicardRichard ButtonNicolò RibaudoAshley Claymore Robin RicardRichard ButtonNicolò RibaudoAshley Claymore July 2022
Module Declarations Daniel EhrenbergNicolò Ribaudo Daniel EhrenbergMark MillerNicolò Ribaudo November 2022
Symbol Predicates Robin RicardJordan Harband Ashley ClaymoreJordan Harband January 2023
Async Iterator helpers Gus Caplan Michael FicarraJonathan KeslinKevin Gibbons June 2024
Iterator.range Jack Works Jack Works April 2024
Async Context Chengzhong Wu Andreu BotellaChengzhong WuJustin Ridgewell April 2024
ESM Phase Imports Luca CasonatoGuy Bedford Luca CasonatoGuy Bedford June 2024
"Discard" (void) Bindings Ron Buckton Ron Buckton June 2024
Propagate active ScriptOrModule with JobCallback Record Chengzhong Wu Chengzhong Wu July 2024
Structs: Fixed Layout Objects and Some Synchronization Primitives Shu-yu Guo Shu-yu Guo October 2024
Extractors Ron Buckton Ron Buckton October 2024
iterator chunking Michael Ficarra Michael Ficarra October 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!).