Vitest bug: "Error: ENOENT: no such file or directory"

[amorey]

When I run vitest with the miniflare environment I get a missing file error due to one of the build files not being present. Here's a minimal vite project that reproduces the error:
https://github.com/amorey/miniflare-vitest-bug

git clone git@github.com:amorey/miniflare-vitest-bug.git
cd miniflare-vitest-bug
pnpm install
pnpm test

In this particular example, the error is that the build artifact dist/main.cjs is missing. If I remove the "main" definition from package.json, the error goes away.