New pool "node-loader"

[sheremet-va]

Clear and concise description of the problem

Node.js supports experimental loaders to transform code and resolve import paths before executing code.

We currently support deps.registerNodeLoader option, but it only transforms imports inside node_modules packages, and it doesn't work in > Node.js 20 because of an API change.

Supporting loaders makes it easier to test 100% compatible Node.js applications (we don't need to reimplement CJS/ESM for #2854).

Suggested solution

Support Node.js loaders

Alternative

No response

Additional context

No response

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.

[segevfiner]

Better yet, is that using a loader, like Jest does in CJS mode with a require hook. Is that Vite can selectively decide to transform or not deep nested imports. So that problem packages imported deep down in the stack that otherwise work correctly when fully bundled can also work in Vitest without requiring to manually add to deps.inline the entire chain of package leading to them.