Reproduce vite-native-config-virtual-modules from its authentic engineer request.

Reproduce vite-native-config-virtual-modules from its authentic engineer request.: a task in vite-selfbench (Harbor dataset). Fix Vite's native config compatibility diagnostics when bundling an .mts config. In a project whose package is CommonJS, Rolldown's internal virtual JavaScript modules can…

The task

Fix Vite's native config compatibility diagnostics when bundling an `.mts` config. In a project whose package is CommonJS, Rolldown's internal virtual JavaScript modules can currently be mistaken for CommonJS files and trigger a false `esm-syntax-in-cjs` warning. Virtual module IDs are not project filesystem modules…

Part of dari-ai/vite-selfbench.