[v4] Using build time environment variables in tailwind

[jason-johnson]

I want to create my project once and apply it to multiple, diverse environments. The environments are differentiated based on environment variables. For example, I will probably have a "primary"/"secondary" colour scheme which applies to all projects but the actual colours depend on the client they are for.

In previous versions of tailwindcss, one could use environment variables in the tailwindcss.config file but the new direction seems to be to move away from this file so it's not clear to me how to handle this use case now. I saw that CSS has an env() function but this seems to be something for run time and what I need is at compile time.

How is the best way to handle this use case now?