[@react-router/dev/vite] triggers warning with pnpm, broken with yarn (3-4.9.2)

[akomm]

Using:
node 22 (same with 20)

• @react-router/node: 7.6.2
• @react-router/serve: 7.6.2
• @react-router/dev: 7.6.2
• default framework template

made all the different install methods and package managers "clean" by removing all caches, locks and node_modules in between.

pnpm dev (= react-router dev) triggers the warning, but works:

The CJS build of Vite's Node API is deprecated. See https://vite.dev/guide/troubleshooting.html#vite-cjs-node-api-deprecated for more details.

The project is fully ESM, none of the problems exist listed above exist.

When installing dependencies with yarn (tested 3.6.3 and 4.9.2) it does crash because of cjs import used (ERR_REQUIRE_ESM). Seems like some yarn issue, since it does not crash when npm install (+pnpm)

This happens using the default template.

vite.config.ts: Removing reactRouter() plugin (from: @react-router/dev/vite) voids the warning under pnpm.

Running VITE_CJS_TRACE=true pnpm vite

Reveals everything was run initially as ESM correctly, but at:
@[email protected]_@[email protected][email protected][email protected]_r_927aab58496416c928f923b6f5ef2a18/node_modules/@react-router/dev/dist/vite.js

Which uses commonjs syntax. Any imports afterwards "forked" to the cjs options, next after is:
[email protected]_@[email protected][email protected][email protected][email protected]/node_modules/vite-node/dist/server.cjs

The switching to .cjs happens in @react-router/dev/vite

I use now pnpm anyway, so its just warning for me, but was surprised of that result out of the box.

Is the plugin still cjs or is there some package.json missconfiguration that switches to cjs?