ECMAScript Internationalization API Specification proposals
March 10, 2026 · View on GitHub
ECMAScript proposals
Active proposals
Proposals follow this process document. This list contains only stage 1 proposals and higher that have not yet been withdrawn/rejected, or become finished.
Stage 3
| Proposal | Author | Champion | Test262 Feature Flag | Meeting Notes |
|---|
Stage 2.7
| Proposal | Author | Champion | Test262 Feature Flag | Meeting Notes |
|---|---|---|---|---|
| Keep trailing zeros in Intl.NumberFormat and Intl.PluralRules | Eemeli Aro | Eemeli Aro | :question: | -2025‑11 -2025‑07 -2025‑05 |
Stage 2
| Proposal | Author | Champion | Stage 2.7 reviewers | Meeting Notes |
|---|---|---|---|---|
eraDisplay option for Intl.DateTimeFormat | Louis-Aime | Shane Carr, Louis-Aime | :question: | -2022‑11 -2021‑01 |
| More Currency Display Choices | Eemeli Aro | Eemeli Aro | :question: | -2024‑12 |
Stage 1
| Proposal | Author | Champion | Meeting Notes |
|---|---|---|---|
| Smart Unit Preferences in Intl.NumberFormat | Younies Mahmoud | Younies Mahmoud | -2024‑10 -2024‑06 -2020‑06 |
| Intl LocaleMatcher | Long Ho | Shane Carr, Long Ho | -2021‑01 |
Intl.Segmenter v2 | Frank Yung-Fong Tang | Frank Yung-Fong Tang | -2022‑01 -2021‑12 |
Intl.MessageFormat | Eemeli Aro | Eemeli Aro | -2024‑06 -2024‑04 -2024‑02 -2023‑09 -2022‑03 |
Intl.MessageResource | Eemeli Aro | Eemeli Aro | -2022‑11 |
| Intl.ZonedDateTimeFormat | Frank Yung-Fong Tang | Frank Yung-Fong Tang | -2023‑05 |
| explore associating a unit with a number | Shane Carr | Shane Carr | -2025‑11 |
Contributing new proposals
Please see Contributing to ECMAScript for the most up-to-date information on contributing proposals to this standard.
Onboarding existing proposals
Proposals that are Stage 1 and above must be transferred to the TC39 GitHub organization for discoverability and archival purposes. To onboard a proposal that lives outside the TC39 organization:
- Transfer your repository to the @tc39-transfer organization
- if you are a TC39 delegate, but not an admin in that organization, please contact @LJHarb
- @bterlson, @gesa, or @codehag will transfer your repository to the TC39 organization the next chance they get.
Note that as part of the onboarding process your repository name may be normalized. Don't worry, repo redirects will continue to work as long as you never create a fork, or a new repository, with the same name - although Github Pages redirects will be broken (please update your links!).