Tailwind autocomplete in vscode

AFAIK tailwind 4 does not use postccs anymore?
And ReScript is in fact a built-in language: tailwindcss-intellisense/packages/tailwindcss-language-service/src/util/languages.ts at main · tailwindlabs/tailwindcss-intellisense · GitHub

The autocomplete works for me in a className="" string. However, when I do this:

let style = ""
<div className=style /> 

the autocomplete does not work in the style string, it needs to be named className.