Repositories list

• proposal-first-class-protocols

  Public
  a proposal to bring protocol-based interfaces to ECMAScript users

  8•360•23•1•Updated Jan 7, 2026Jan 7, 2026

• tc39.github.io

  Public

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

  HTML

  •

  MIT License

  •61•331•28•2•Updated Jan 7, 2026Jan 7, 2026

• dataset

  Public
  The automatic track tc39 proposals

  tc39

  TypeScript

  •

  The Unlicense

  •11•45•2•0•Updated Jan 7, 2026Jan 7, 2026

• 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•6•Updated Jan 6, 2026Jan 6, 2026

• proposal-temporal

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

  HTML

  •

  Other

  •171•3.6k•29•27•Updated Jan 6, 2026Jan 6, 2026

• agendas

  Public
  TC39 meeting agendas

  JavaScript

  •199•1.2k•0•2•Updated Jan 6, 2026Jan 6, 2026

• test262

  Public

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

  javascriptjstests+ 1tc39

  JavaScript

  •

  Other

  •519•2.7k•207•88•Updated Jan 6, 2026Jan 6, 2026

• proposal-error-stacks

  Public
  ECMAScript Proposal, specs, and reference implementation for Error.prototype.stack / System.getStack

  HTML

  •

  MIT License

  •11•184•13•5•Updated Jan 5, 2026Jan 5, 2026

• proposal-import-sync

  Public
  MIT License

  •2•45•5•1•Updated Jan 3, 2026Jan 3, 2026

• proposal-joint-iteration

  Public

  tc39/proposal-joint-iteration’s past year of commit activity
  a TC39 proposal to synchronise the advancement of multiple iterators

  TypeScript

  •3•106•1•0•Updated Jan 2, 2026Jan 2, 2026

• test262-harness

  Public
  Experimental harness for test262

  JavaScript

  •

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

  •47•90•14•4•Updated Jan 1, 2026Jan 1, 2026

• proposal-iterator-join

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

  JavaScript

  •

  MIT License

  •0•8•0•0•Updated Dec 24, 2025Dec 24, 2025

• ecma262

  Public

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

  javascriptecmascript

  HTML

  •

  Other

  •1.4k•16k•353•116•Updated Dec 22, 2025Dec 22, 2025

• ecma402

  Public
  Status, process, and documents for ECMA 402

  HTML

  •

  Other

  •114•592•157•10•Updated Dec 19, 2025Dec 19, 2025

• proposal-async-context

  Public
  Async Context for JavaScript

  javascript

  HTML

  •

  Creative Commons Zero v1.0 Universal

  •24•803•23•5•Updated Dec 18, 2025Dec 18, 2025

• proposal-object-symbols

  Public
  MIT License

  •0•1•1•1•Updated Dec 17, 2025Dec 17, 2025

• proposal-deferred-reexports

  Public
  MIT License

  •5•43•7•2•Updated Dec 16, 2025Dec 16, 2025

• ecma404

  Public archive
  Status, process, and documents for ECMA 404

  HTML

  •0•2•0•0•Updated Dec 12, 2025Dec 12, 2025

• proposals

  Public
  Tracking ECMAScript Proposals

  javascriptlanguageproposal+ 5ecmascriptspecspecificationlanguage-designcommittee

  736•19k•7•3•Updated Dec 10, 2025Dec 10, 2025

• proposal-iterator-sequencing

  Public
  a TC39 proposal to create iterators by sequencing existing iterators

  JavaScript

  •6•85•0•0•Updated Dec 8, 2025Dec 8, 2025

• how-we-work

  Public
  Documentation of how TC39 operates and how to participate

  29•216•23•10•Updated Dec 5, 2025Dec 5, 2025

• ecma426

  Public
  Source map specification, RFCs and new proposals.

  JavaScript

  •

  Other

  •24•174•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•44•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•253•0•0•Updated Nov 23, 2025Nov 23, 2025

• proposal-import-text

  Public
  A TC39 proposal for importing text

  0•19•4•0•Updated Nov 22, 2025Nov 22, 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•12•2•0•Updated Nov 19, 2025Nov 19, 2025

• proposal-object-property-count

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

  MIT License

  •2•38•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•27•28•0•Updated Nov 19, 2025Nov 19, 2025

• proposal-typedarray-findwithin

  Public
  A proposal for searching for a subsequence within a TypedArray

  JavaScript

  •

  MIT License

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