Recommended approach for component variants

[bd-cbasmajian]

Hello, I'm migrating from version 3 -> 4. What is the recommended approach for creating components with variants that minimizes code duplication?

For example, I have a base button class named .btn. I have variants that modify some properties, for example .btn-primary and .btn-secondary.
In v3, I could use @apply btn in my variants, similar to the way sass uses @extend.
I do not want a solution that uses class lists in web or framework classes. I just want variants classes that are portable and can be used in any markup.
I do not want to use all css variables, too much code.

Should I still be using tailwind?