update optimize-locales plugin type

[stefanprobst]

this updates the optimize-locales plugin type:

the second generic in UnpluginInstance is for nested plugins, see https://github.com/unjs/unplugin/blob/466f4d5be7ba048d81613d853c34d7eea2518507/src/types.ts#L162

setting to false instead of boolean means that the optimize-locales plugin will be typed as just Plugin instead of Array<Plugin> | Plugin>.

avoids type issue when spreading like here: https://react-spectrum.adobe.com/react-aria/internationalization.html#vite

[snowystinger]

Thanks for the PR, it's interesting, I can't seem to reproduce the error here https://github.com/adobe/react-spectrum/blob/main/examples/remix/vite.config.ts though the change makes sense.
Do you have a reproduction handy?

I copied our remix example out to a different directory so the workspaces wouldn't exist and built it from there. Found a couple updates that needed to be made #8090 and removed the workspaces/resolutions entry in the package.json. But no error in my vite.config.ts like this one.

[stefanprobst]

i ran into this trying our tanstack/start - tsc seems to be fine with it but i did get this eslint error:

here's a repo where you can see the lint error: https://github.com/stefanprobst/issue-rac-optimize-locales-types/blob/main/app.config.ts

[snowystinger]

o, because technically you can do it, just some eslint rule thinks it's better if you don't

haha, ok, approved, for now you can ts-expect-error