Repositories list

• agendas

  Public
  TC39 meeting agendas

  JavaScript

  •200•1.2k•0•3•Updated Feb 27, 2026Feb 27, 2026

• dataset

  Public

  tc39/dataset’s past year of commit activity
  The automatic track tc39 proposals

  tc39

  TypeScript

  •

  The Unlicense

  •11•47•2•0•Updated Feb 27, 2026Feb 27, 2026

• proposal-temporal

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

  HTML

  •

  Other

  •173•3.7k•17•4•Updated Feb 26, 2026Feb 26, 2026

• ecma262

  Public
  Status, process, and documents for ECMA-262

  javascriptecmascript

  HTML

  •

  Other

  •1.4k•16k•357•116•Updated Feb 26, 2026Feb 26, 2026

• test262-harness

  Public

  tc39/test262-harness’s past year of commit activity
  Experimental harness for test262

  JavaScript

  •

  BSD 3-Clause "New" or "Revised" License

  •46•93•14•8•Updated Feb 26, 2026Feb 26, 2026

• proposal-intl-keep-trailing-zeros

  Public
  MIT License

  •1•3•1•1•Updated Feb 26, 2026Feb 26, 2026

• proposal-amount

  Public
  Numbers with precision and a unit for JavaScript

  javascriptunits-of-measurenumbers+ 3accuracymeasurementsprecision

  HTML

  •

  MIT License

  •8•44•34•4•Updated Feb 26, 2026Feb 26, 2026

• proposal-intl-era-monthcode

  Public

  tc39/proposal-intl-era-monthcode’s past year of commit activity
  To specify necessary details about era, eraYear and monthCode usage with Temporal for non-ISO calendars.

  HTML

  •

  MIT License

  •9•6•5•1•Updated Feb 25, 2026Feb 25, 2026

• proposal-first-class-protocols

  Public

  tc39/proposal-first-class-protocols’s past year of commit activity
  a proposal to bring protocol-based interfaces to ECMAScript users

  JavaScript

  •

  MIT License

  •8•365•25•1•Updated Feb 25, 2026Feb 25, 2026

• test262

  Public
  Official ECMAScript Conformance Test Suite

  javascriptjstests+ 1tc39

  JavaScript

  •

  Other

  •526•2.7k•210•90•Updated Feb 25, 2026Feb 25, 2026

• tc39.github.io

  Public
  Get involved in specifying JavaScript

  HTML

  •

  MIT License

  •61•331•28•2•Updated Feb 25, 2026Feb 25, 2026

• proposal-typedarray-findwithin

  Public
  A proposal for searching for a subsequence within a TypedArray

  JavaScript

  •

  MIT License

  •0•7•7•0•Updated Feb 24, 2026Feb 24, 2026

• proposal-typedarray-concat

  Public
  A proposal for optimizable TypedArray concatenation

  JavaScript

  •

  MIT License

  •0•2•7•0•Updated Feb 24, 2026Feb 24, 2026

• proposal-thenable-curtailment

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

  MIT License

  •0•11•6•0•Updated Feb 23, 2026Feb 23, 2026

• proposal-deferred-reexports

  Public
  MIT License

  •5•50•7•2•Updated Feb 23, 2026Feb 23, 2026

• ecmarkup

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

  TypeScript

  •

  MIT License

  •74•237•101•13•Updated Feb 22, 2026Feb 22, 2026

• ecma426

  Public
  Source map specification, RFCs and new proposals.

  JavaScript

  •

  Other

  •26•176•63•7•Updated Feb 20, 2026Feb 20, 2026

• ecma402

  Public
  Status, process, and documents for ECMA 402

  HTML

  •

  Other

  •114•595•160•7•Updated Feb 19, 2026Feb 19, 2026

• tg5

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

  3•26•28•0•Updated Feb 18, 2026Feb 18, 2026

• notes

  Public
  TC39 meeting notes

  JavaScript

  •125•700•1•12•Updated Feb 17, 2026Feb 17, 2026

• proposal-decimal

  Public
  Built-in exact decimal numbers for JavaScript

  javascriptarithmeticdecimal+ 2ieee754decimal128

  HTML

  •18•605•54•0•Updated Feb 12, 2026Feb 12, 2026

• proposal-defer-import-eval

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

  HTML

  •

  MIT License

  •21•304•6•2•Updated Feb 12, 2026Feb 12, 2026

• how-we-work

  Public
  Documentation of how TC39 operates and how to participate

  29•215•23•9•Updated Feb 12, 2026Feb 12, 2026

• proposal-async-context

  Public
  Async Context for JavaScript

  javascript

  HTML

  •

  Creative Commons Zero v1.0 Universal

  •26•825•23•8•Updated Feb 11, 2026Feb 11, 2026

• proposal-import-bytes

  Public
  A modest proposal for importing bytes in javascript

  JavaScript

  •

  MIT License

  •5•73•2•0•Updated Feb 9, 2026Feb 9, 2026

• proposals

  Public
  Tracking ECMAScript Proposals

  javascriptlanguageproposal+ 5ecmascriptspecspecificationlanguage-designcommittee

  741•19k•3•2•Updated Feb 4, 2026Feb 4, 2026

• faq

  Public
  0•72•1•0•Updated Jan 30, 2026Jan 30, 2026

• proposal-signals

  Public
  A proposal to add signals to JavaScript.

  MIT License

  •71•4.1k•101•8•Updated Jan 25, 2026Jan 25, 2026

• proposal-smart-unit-preferences

  Public
  HTML

  •

  MIT License

  •6•25•5•0•Updated Jan 23, 2026Jan 23, 2026

• proposal-composable-accessors

  Public
  Incrementally add functionality to accessors via built-in decorators

  1•7•0•1•Updated Jan 23, 2026Jan 23, 2026