Repositories list

• proposal-amount

  Public
  Numbers with precision and a unit for JavaScript

  javascriptunits-of-measurenumbers+ 3

  javascriptunits-of-measurenumbersaccuracymeasurementsprecision

  HTML

  •

  MIT License

  •1010 forks•4848 stars•4444 issues•11 pull request•Updated May 15, 2026May 15, 2026

• test262

  Public
  Official ECMAScript Conformance Test Suite

  javascriptjstests+ 1

  javascriptjsteststc39

  JavaScript

  •

  Other

  •542542 forks•2.8k2.8k stars•212212 issues•108108 pull requests•Updated May 15, 2026May 15, 2026

• dataset

  Public
  The automatic track tc39 proposals

  tc39

  tc39

  TypeScript

  •

  The Unlicense

  •1212 forks•4747 stars•22 issues•00 pull requests•Updated May 15, 2026May 15, 2026

• ecma402

  Public
  Status, process, and documents for ECMA 402

  HTML

  •

  Other

  •115115 forks•600600 stars•170170 issues•1111 pull requests•Updated May 14, 2026May 14, 2026

• tc39.github.io

  Public
  Get involved in specifying JavaScript

  HTML

  •

  MIT License

  •6363 forks•331331 stars•2727 issues•55 pull requests•Updated May 14, 2026May 14, 2026

• notes

  Public
  TC39 meeting notes

  JavaScript

  •127127 forks•707707 stars•11 issue•77 pull requests•Updated May 14, 2026May 14, 2026

• agendas

  Public
  TC39 meeting agendas

  JavaScript

  •200200 forks•1.2k1.2k stars•00 issues•33 pull requests•Updated May 13, 2026May 13, 2026

• ecma262

  Public
  Status, process, and documents for ECMA-262

  javascriptecmascript

  javascriptecmascript

  HTML

  •

  Other

  •1.4k1.4k forks•16k16k stars•364364 issues•127127 pull requests•Updated May 13, 2026May 13, 2026

• proposal-temporal

  Public
  Provides standard objects and functions for working with dates and times.

  HTML

  •

  Other

  •176176 forks•3.7k3.7k stars•2020 issues•66 pull requests•Updated May 12, 2026May 12, 2026

• proposals

  Public
  Tracking ECMAScript Proposals

  javascriptlanguageproposal+ 5

  javascriptlanguageproposalecmascriptspecspecificationlanguage-designcommittee

  745745 forks•19k19k stars•33 issues•33 pull requests•Updated May 12, 2026May 12, 2026

• tg5

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

  44 forks•2626 stars•2828 issues•00 pull requests•Updated May 12, 2026May 12, 2026

• proposal-async-context

  Public
  Async Context for JavaScript

  javascript

  javascript

  HTML

  •

  Creative Commons Zero v1.0 Universal

  •2828 forks•845845 stars•2323 issues•99 pull requests•Updated May 11, 2026May 11, 2026

• proposal-stable-formatting

  Public
  A TC-39 proposal to bring stable Intl-inspired formatting options to ECMAScript

  HTML

  •33 forks•1313 stars•55 issues•66 pull requests•Updated May 10, 2026May 10, 2026

• ecmarkup

  Public
  An HTML superset/Markdown subset source format for ECMAScript and related specifications

  TypeScript

  •

  MIT License

  •7575 forks•241241 stars•9999 issues•1717 pull requests•Updated May 9, 2026May 9, 2026

• eshost

  Public
  A uniform wrapper around a multitude of ECMAScript hosts. CLI: https://github.com/bterlson/eshost-cli

  JavaScript

  •

  Other

  •4444 forks•147147 stars•1212 issues•11 pull request•Updated May 8, 2026May 8, 2026

• proposal-intl-sequence-units

  Public
  Support for CLDR mixed units, like "5ft 6in"

  JavaScript

  •

  MIT License

  •00 forks•11 star•66 issues•00 pull requests•Updated May 8, 2026May 8, 2026

• proposal-dynamic-code-brand-checks

  Public
  TC39 proposal that enables flexible brand checks before dynamic code loading

  HTML

  •

  MIT License

  •55 forks•5151 stars•22 issues•11 pull request•Updated May 8, 2026May 8, 2026

• proposal-immutable-arraybuffer

  Public
  A TC39 proposal for immutable ArrayBuffers

  JavaScript

  •

  MIT License

  •66 forks•3636 stars•66 issues•00 pull requests•Updated May 8, 2026May 8, 2026

• proposal-deferred-reexports

  Public
  MIT License

  •66 forks•5454 stars•77 issues•33 pull requests•Updated May 7, 2026May 7, 2026

• faq

  Public
  11 fork•7272 stars•11 issue•00 pull requests•Updated May 7, 2026May 7, 2026

• proposal-thenable-curtailment

  Public
  A proposal to curtail the power of "thenable" objects.

  MIT License

  •22 forks•1414 stars•1010 issues•00 pull requests•Updated May 6, 2026May 6, 2026

• proposal-upsert

  Public
  ECMAScript Proposal, specs, and reference implementation for Map.prototype.upsert

  MIT License

  •3131 forks•348348 stars•66 issues•00 pull requests•Updated May 6, 2026May 6, 2026

• proposal-esm-phase-imports

  Public
  HTML

  •

  MIT License

  •33 forks•5353 stars•44 issues•44 pull requests•Updated Apr 25, 2026Apr 25, 2026

• proposal-defer-import-eval

  Public
  A proposal for introducing a way to defer evaluate of a module

  HTML

  •

  MIT License

  •2121 forks•311311 stars•77 issues•11 pull request•Updated Apr 21, 2026Apr 21, 2026

• proposal-intl-unit-protocol

  Public
  TC39 proposal for adding units to format functions

  JavaScript

  •

  MIT License

  •00 forks•88 stars•22 issues•00 pull requests•Updated Apr 21, 2026Apr 21, 2026

• proposal-json-parseimmutable

  Public
  JSON.parseImmutable for creating Records and Tuples from JSON strings

  HTML

  •

  MIT License

  •33 forks•4545 stars•33 issues•11 pull request•Updated Apr 20, 2026Apr 20, 2026

• ecma426

  Public
  Source map specification, RFCs and new proposals.

  JavaScript

  •

  Other

  •2626 forks•185185 stars•6363 issues•1010 pull requests•Updated Apr 15, 2026Apr 15, 2026

• proposal-iterator-includes

  Public
  Array.prototype.includes but for iterators

  JavaScript

  •22 forks•1010 stars•11 issue•00 pull requests•Updated Apr 11, 2026Apr 11, 2026

• how-we-work

  Public
  Documentation of how TC39 operates and how to participate

  2929 forks•219219 stars•2323 issues•99 pull requests•Updated Apr 10, 2026Apr 10, 2026

• proposal-duplicate-named-capturing-groups

  Public archive
  TC39 proposal to allow regex capturing group names to be repeated

  22 forks•3131 stars•11 issue•00 pull requests•Updated Apr 10, 2026Apr 10, 2026