Koa v3 Tracker

[jonathanong]

Starting a new tracker for v3

Milestone: https://github.com/koajs/koa/milestone/4

Other Breaking Changes:

• rewrite to ES modules
• adjust naming to WHATWG standards https://nodejs.org/api/url.html#url_url_strings_and_url_objects
• rename raw http requests? koa 3.0 roadmap #1114 (comment)
• officially support the http2 module

Future:

• Deno support
• Bun support
• Rewrite in TypeScript

Tests:

• Migrate to jest
• Properly close down server after each test run

Improved Documentation:

• how to serve http/https/http2
• example of how to use expect-continue
• How to sent Content-Length on a HEAD response #1827
• How to use SSE with Koa? #1774 SSE example with AI chat

[jaydenseric]

Regarding the goal to move to Jest; please don't. Use the native Node.js test runner! It should be more than adequate.

You can pair it with coverage-node, a very lightweight CLI tool, to enforce 100% code coverage in tests:

https://github.com/jaydenseric/coverage-node

[talentlessguy]

to add, Node test runner has identical API to Jest

for assertion, node:assert could be used

[benmccann]

Vitest is another fairly lightweight option for jest-compatible test runner. My last experience was that Jest is terrible to use with ESM as it doesn't fully support it yet. vitest is much better in this regard.

A rewrite might also be a nice time to take a look at including only minimal dependencies (e.g. https://npmgraph.js.org/?q=koa vs https://npmgraph.js.org/?q=polka)

[jonathanong]

I just realized that I already migrated it to jest a while go haha. if anyone is interested in migrating to node's official test runner, that would be great. otherwise, I will leave it as is