Vite 3 Bug - HMR First Dev

HMR doesn't work the first time the dev server is started.

Reproduction steps:

1. git clone git@github.com:brillout/vite-3-bug_hmr-first-dev
   cd vite-3-bug_hmr-first-dev/
   pnpm install
   pnpm run dev

   Same as single line (copy-paste me):

   git clone git@github.com:brillout/vite-3-bug_hmr-first-dev && cd vite-3-bug_hmr-first-dev/ && pnpm install && pnpm run dev

2. Go to http://localhost:3000/. Observe in the terminal the following message:

   3:06:09 PM [vite] ✨ new dependencies optimized: .pnpm/vite@3.0.0-beta.0/node_modules/vite/dist/client/client.mjs
   3:06:09 PM [vite] ✨ optimized dependencies changed. reloading
   

3. Wait for the page to finish loading. Then increment the counter button. The button text is now Counter 1.

4. Edit /pages/index/index.page.jsx. E.g. change Welcome to Welcome !. Observe that a) the page is reloaded and the counter is reset to Counter 0, and b) the terminal says:

   3:06:21 PM [vite] page reload pages/index/index.page.jsx
   

   In other words: HMR doesn't work.

5. Shut down the server (hit Ctrl-C in the terminal), re-start the server (pnpm run dev), and go to http://localhost:3000/ again.

6. Again: click on the counter button to get Counter 1, edit /pages/index/index.page.jsx, and observe how HMR now works: a) the page is not reloaded and the counter state Counter 1 is preserved, and b) the terminal says:

   3:05:47 PM [vite] hmr update /pages/index/index.page.jsx
   

To re-reproduce the bug remove node_modules/.vite/ and try again.

Conclusion: HRM is broken when node_modules/.vite/ has not already been generated.