Clear and concise description of the problem

As a developer using Vitest, I would like any Rollup plugins using the this.warn API to automatically show the warnings in the console while I am running tests, so that I know there might be issues in the plugin that I should fix.

This actually seems to work out-of-the-box today with Vite (minimal repro):

[plugin:custom-rollup-plugin] [plugin custom-rollup-plugin] I am warning you!! (x4)

However, a similar repro with Vitest does not show any warnings when running vitest.

Suggested solution

By default, I think Rollup warnings should be shown in the console. Perhaps there could also be a way to disable this default behavior, or to handle the warnings in vitest.config.js.

Alternative

I'm not aware of any way to surface Rollup plugin warnings using current Vitest. I apologize if I missed something in the docs!

Additional context

$ node --version
v20.11.0
$ npm --version
10.4.0

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.