HMR does not pickup windi config's customisations if they were not used before the cold start

[bhvngt]

Describe the bug

I have an app that uses svelte, windicss and vite. Customisation made within windi.config.js if not used before cold start are not getting picked up by the HMR.

Minimal Reproductions
Here's the codesandbox that produces this bug.

1. bg-primary is used in App.svelte
2. When vite is started it correctly reflects the custom color.
3. When the value of primary is changed it gets pickedup by vite's HMR and is reflected on the site.
4. If the class is now changed to bg-secondary which was not used in the app earlier, though vite's file watcher records the change, the class itself is not reflected in the output. Possibly because it does not get sent to the browser by windicss

Versions

• vite-plugin-windicss: 1.4.3
• vite: 2.5.7
• framework(vue/react/svelte/etc): svelte