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@tc39

Ecma TC39

Ecma International, Technical Committee 39 - ECMAScript

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TC39

Ecma International's TC39 is a group of JavaScript developers, implementers, academics, and more, collaborating with the community to maintain and evolve the definition of JavaScript.

Contribute

TC39 welcomes contributions from the JavaScript community, whether it is feedback on existing proposals, improved documentation, testing, implementations, or even language feature ideas. See our contributor guide for details.

Important

To participate in TC39 meetings as a member, join Ecma.

Specifications

We develop the JavaScript (formally, ECMAScript) specification, the Internationalization API specification, the Source Map specification, and, of course, JSON! We meet every two months to discuss proposals. To learn more about the process, please take a look at the six stages for new language feature proposals. See our meeting agendas and minutes to learn more.

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  1. ecma262 ecma262 Public

    Status, process, and documents for ECMA-262

    HTML 15.5k 1.4k

  2. ecma402 ecma402 Public

    Status, process, and documents for ECMA 402

    HTML 580 112

  3. test262 test262 Public

    Official ECMAScript Conformance Test Suite

    JavaScript 2.6k 502

  4. proposals proposals Public

    Tracking ECMAScript Proposals

    18.9k 737

  5. agendas agendas Public

    TC39 meeting agendas

    JavaScript 1.2k 199

  6. notes notes Public

    TC39 meeting notes

    JavaScript 686 125

Repositories

Showing 10 of 307 repositories
  • dataset Public

    The automatic track tc39 proposals

    tc39/dataset’s past year of commit activity
    TypeScript 46 Unlicense 13 2 0 Updated Sep 19, 2025
  • agendas Public

    TC39 meeting agendas

    tc39/agendas’s past year of commit activity
    JavaScript 1,150 199 0 3 Updated Sep 18, 2025
  • test262 Public

    Official ECMAScript Conformance Test Suite

    tc39/test262’s past year of commit activity
    JavaScript 2,591 502 207 (4 issues need help) 65 Updated Sep 18, 2025
  • notes Public

    TC39 meeting notes

    tc39/notes’s past year of commit activity
    JavaScript 686 125 1 (1 issue needs help) 7 Updated Sep 18, 2025
  • .github Public
    tc39/.github’s past year of commit activity
    3 5 0 0 Updated Sep 18, 2025
  • proposal-temporal Public

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

    tc39/proposal-temporal’s past year of commit activity
    HTML 3,589 172 33 6 Updated Sep 18, 2025
  • proposal-import-bytes Public

    A modest proposal for importing bytes in javascript

    tc39/proposal-import-bytes’s past year of commit activity
    JavaScript 43 MIT 3 3 0 Updated Sep 18, 2025
  • proposal-upsert Public

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

    tc39/proposal-upsert’s past year of commit activity
    309 MIT 23 4 0 Updated Sep 18, 2025
  • proposal-immutable-arraybuffer Public

    A TC39 proposal for immutable ArrayBuffers

    tc39/proposal-immutable-arraybuffer’s past year of commit activity
    JavaScript 30 MIT 4 7 1 Updated Sep 17, 2025
  • ecma262 Public

    Status, process, and documents for ECMA-262

    tc39/ecma262’s past year of commit activity
    HTML 15,461 1,363 356 (10 issues need help) 132 Updated Sep 16, 2025