props.class vs $attrs.class

[kylemilloy]

Hey I notice in a lot of components we use props.class and pass that to a cn helper. I get the sense this is a holdover from converting this from react to vue where we have to explicitly define a class prop for components however in vue we can leverage $attr.class.

Is my assumption correct or is there another reason we're explicitly defining a class prop? If that is the reason, can we reduce some boilerplate by using $attr.class instead?

[sadeghbarati]

Reason we used class as props is mentioned in the PR link

#241