Repositories list

• proposal-temporal

  Public

  tc39/proposal-temporal’s past year of commit activity
  Provides standard objects and functions for working with dates and times.

  HTML

  •

  Other

  •169•3.6k•29•13•Updated Dec 9, 2025Dec 9, 2025

• ecma402

  Public

  tc39/ecma402’s past year of commit activity
  Status, process, and documents for ECMA 402

  HTML

  •

  Other

  •113•590•157•10•Updated Dec 9, 2025Dec 9, 2025

• dataset

  Public
  The automatic track tc39 proposals

  tc39

  TypeScript

  •

  The Unlicense

  •11•45•2•0•Updated Dec 9, 2025Dec 9, 2025

• test262

  Public

  tc39/test262’s past year of commit activity
  Official ECMAScript Conformance Test Suite

  javascriptjstests+ 1tc39

  JavaScript

  •

  Other

  •514•2.6k•213•66•Updated Dec 8, 2025Dec 8, 2025

• ecma262

  Public

  tc39/ecma262’s past year of commit activity
  Status, process, and documents for ECMA-262

  javascriptecmascript

  HTML

  •

  Other

  •1.4k•16k•354•122•Updated Dec 8, 2025Dec 8, 2025

• proposal-iterator-sequencing

  Public
  a TC39 proposal to create iterators by sequencing existing iterators

  JavaScript

  •6•83•0•0•Updated Dec 8, 2025Dec 8, 2025

• proposal-iterator-join

  Public
  JS proposal for a means to concatenate the contents of an iterator into a string

  JavaScript

  •

  MIT License

  •0•6•0•0•Updated Dec 8, 2025Dec 8, 2025

• proposals

  Public
  Tracking ECMAScript Proposals

  javascriptlanguageproposal+ 5ecmascriptspecspecificationlanguage-designcommittee

  737•19k•6•5•Updated Dec 7, 2025Dec 7, 2025

• how-we-work

  Public

  tc39/how-we-work’s past year of commit activity
  Documentation of how TC39 operates and how to participate

  29•215•23•10•Updated Dec 5, 2025Dec 5, 2025

• tc39.github.io

  Public

  tc39/tc39.github.io’s past year of commit activity
  Get involved in specifying JavaScript

  HTML

  •

  MIT License

  •61•331•27•2•Updated Dec 4, 2025Dec 4, 2025

• ecma426

  Public
  Source map specification, RFCs and new proposals.

  JavaScript

  •

  Other

  •22•173•62•8•Updated Dec 3, 2025Dec 3, 2025

• proposal-nonextensible-applies-to-private

  Public
  Proposal to disallow adding new private fields to non-extensible objects

  JavaScript

  •

  MIT License

  •1•9•4•0•Updated Nov 27, 2025Nov 27, 2025

• proposal-concurrency-control

  Public
  interfaces and data structures for concurrency control and integration into async iterator helpers

  TypeScript

  •0•41•12•1•Updated Nov 26, 2025Nov 26, 2025

• proposal-json-parse-with-source

  Public
  Proposal for extending JSON.parse to expose input source text.

  HTML

  •

  MIT License

  •9•254•0•0•Updated Nov 23, 2025Nov 23, 2025

• proposal-import-text

  Public
  A TC39 proposal for importing text

  0•18•4•0•Updated Nov 22, 2025Nov 22, 2025

• proposal-intl-era-monthcode

  Public
  To specify necessary details about era, eraYear and monthCode usage with Temporal for non-ISO calendars.

  HTML

  •

  MIT License

  •8•4•17•3•Updated Nov 22, 2025Nov 22, 2025

• agendas

  Public
  TC39 meeting agendas

  JavaScript

  •198•1.2k•0•3•Updated Nov 19, 2025Nov 19, 2025

• proposal-object-keys-length

  Public
  `Object.keysLength`: a way to count own enumerable string keys without making an array first

  JavaScript

  •

  MIT License

  •0•10•2•0•Updated Nov 19, 2025Nov 19, 2025

• proposal-object-property-count

  Public
  TC39 proposal for Object.propertyCount(target[, options])

  MIT License

  •2•37•3•0•Updated Nov 19, 2025Nov 19, 2025

• tg5

  Public
  TC39-TG5: Experiments in programming language standardization. https://ecma-international.org/task-groups/tc39-tg5/

  3•26•28•0•Updated Nov 19, 2025Nov 19, 2025

• proposal-typedarray-findwithin

  Public
  A proposal for searching for a subsequence within a TypedArray

  JavaScript

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  MIT License

  •0•3•4•0•Updated Nov 18, 2025Nov 18, 2025

• proposal-typedarray-concat

  Public
  A proposal for optimizable TypedArray concatenation

  JavaScript

  •

  MIT License

  •0•1•5•0•Updated Nov 18, 2025Nov 18, 2025

• proposal-intl-locale-info

  Public
  An API to expose information of locale, such as week data ( first day of a week, weekend start, weekend end), hour cycle, measurement system, commonly used calendar, etc.

  HTML

  •

  MIT License

  •14•61•0•0•Updated Nov 18, 2025Nov 18, 2025

• proposal-await-dictionary

  Public
  A proposal to add Promise.allKeyed to ECMAScript

  JavaScript

  •

  MIT License

  •8•118•5•0•Updated Nov 18, 2025Nov 18, 2025

• proposal-error-stack-accessor

  Public
  ECMAScript Proposal, specs, and reference implementation for Error.prototype.stack accessor

  MIT License

  •2•19•3•0•Updated Nov 18, 2025Nov 18, 2025

• proposal-error-capturestacktrace

  Public
  Standardizing Error.captureStackTrace

  MIT License

  •3•11•5•0•Updated Nov 18, 2025Nov 18, 2025

• proposal-deferred-reexports

  Public
  MIT License

  •4•44•5•1•Updated Nov 18, 2025Nov 18, 2025

• proposal-amount

  Public
  Numbers with precision and a unit for JavaScript

  javascriptunits-of-measurenumbers+ 3accuracymeasurementsprecision

  HTML

  •

  MIT License

  •5•38•31•3•Updated Nov 13, 2025Nov 13, 2025

• proposal-native-promise-predicate

  Public
  ECMAScript Proposal and spec for exposing a native promise predicate

  JavaScript

  •

  MIT License

  •1•12•3•1•Updated Nov 13, 2025Nov 13, 2025

• proposal-native-promise-adoption

  Public
  ECMAScript Proposal for adopting native promise state

  JavaScript

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  MIT License

  •0•7•1•0•Updated Nov 13, 2025Nov 13, 2025