Hi! I'm one of the maintainer of Misskey, a federated microblogging platform built with TypeScript.

I'm currently trying to bundle and minify backend using Rolldown to improve memory consumption, as the whole code will be stored on memory when running the server.

misskey-dev/misskey#17068

However, the server was not launched (not all modules are loaded and stuck forever) until @babu-ch provided a fix:

kakkokari-gtyih/misskey#2

This pull request moves some of the custom Error class defined as a static member of the class, to a root level. After this patch, the backend successfully up and started running.

While I can now proceed to migrate build steps to rolldown, I'm curious if this is a bug related to rolldown or upstream tools (i.e. oxc). The following points are worth noting:

• This pull request did not move all classes defined as static members within a class to the root level. There are still places, such as ClipService, that use this syntax. Although we did not change those, it worked without any issues.
• Of course, it works without any issues in the current build steps (file-to-file conversion using SWC).

One tricky point is that this project uses NestJS, and therefore decorator metadata is in use.
Any suggestions or insights are much appreciated, thank you for the awesome tooling for JavaScript!