WinterTC

Technical Committee on Web-interoperable Server Runtimes

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README.md

WinterTC (TC55)

Ecma Technical Committee 55: Web-interoperable Server Runtimes (a.k.a. WinterTC) aims to provide a space for JavaScript runtimes to collaborate on API interoperability with each other and with the web.

Learn more at https://wintertc.org/.

We have a public calendar for the WinterTC meetings (you must be a member to join).

Participating

If you are a representative of company or an individual building a web-interoperable runtime, or are interested in collaborating on the work that we do, here is how you can help.

You can open an issue or a PR to any of the existing repos in this GitHub organization.
You can participate in workstream discussions you are interested in. You can find the active workstreams at https://wintertc.org/work
You can join the WinterTC Matrix channel: https://matrix.to/#/#wintertc:matrix.org. This is the primary communications channel outside of the GitHub issues.
You can review the agendas and minutes of the regularly held meetings.
In most scenarios, you can join the committee to actively attend meetings.

Joining the committee

Important

Meetings are private to committee members, but agendas and minutes are public.

Members are typically one of two categories: Delegates and Invited Experts.

If you work for an Ecma member organization), you can become a delegate on behalf of your employer.
If you don't work for an Ecma member, or your company is still exploring membership, you can participate by becoming an invited expert.

If you have already joined the committee via one of these roles, you can find the link to join the call via the GitHub organisation members-only view

For more information on WinterTC (TC55)'s scope and programme of work, see the committee page on Ecma's website.

WinterTC (TC55) was initially started as a W3C Community Group called WinterCG, but in December 2024 decided to move to Ecma. You can read the rationale for this move in the standardization document. All documents from the W3C Community Group era are retained in the WinterCG Archive.

Popular repositories Loading

iter-streams iter-streams Public

A proposal for a new streams API

TypeScript 459 7
proposal-minimum-common-api proposal-minimum-common-api Public

Bikeshed 308 17
proposal-webcrypto-streams proposal-webcrypto-streams Public

Bikeshed 96 4
admin admin Public

The place to work on boostrap, charter, etc

74 4
proposal-sockets-api proposal-sockets-api Public

Proposal for an API for establishing TCP connections in Non-Browser JavaScript runtime environments

HTML 57 6
www www Public

The website for this TC

TypeScript 53 18

Repositories

Type Language Sort

admin Public
The place to work on boostrap, charter, etc

WinterTC55/admin's past year of commit activity

74 4 17 2 Updated Aug 10, 2026
www Public
The website for this TC

WinterTC55/www's past year of commit activity

TypeScript 53 18 1 0 Updated Aug 1, 2026
iter-streams Public
A proposal for a new streams API

WinterTC55/iter-streams's past year of commit activity

TypeScript 459 MIT 7 9 4 Updated Jul 31, 2026
proposal-sockets-api Public
Proposal for an API for establishing TCP connections in Non-Browser JavaScript runtime environments

WinterTC55/proposal-sockets-api's past year of commit activity

HTML 57 6 12 1 Updated Jul 31, 2026
proposal-minimum-common-api Public

WinterTC55/proposal-minimum-common-api's past year of commit activity

Bikeshed 308 17 34 1 Updated Jul 31, 2026
runtime-keys Public
A proposal defining standard identifier keys for various runtime environments

WinterTC55/runtime-keys's past year of commit activity

HTML 46 17 12 0 Updated May 28, 2026
.github Public

WinterTC55/.github's past year of commit activity

1 0 2 1 Updated Mar 6, 2026
proposal-http-server-api Public
WinterTC HTTP server API proposal

WinterTC55/proposal-http-server-api's past year of commit activity

4 0 6 0 Updated Feb 6, 2026
fetch-workstream Public
A repo to discuss the requirements of server-side runtimes wrt the WHATWG Fetch spec

WinterTC55/fetch-workstream's past year of commit activity

3 0 14 0 Updated Feb 6, 2025
fetch Public archive Forked from whatwg/fetch
WinterCG changes to the WHATWG Fetch standard

WinterTC55/fetch's past year of commit activity

HTML 26 489 13 0 Updated Nov 30, 2024