What are the Gulp/Grunt modules for minifying css classes (eg from .catalog__item to .a1)?

Question

css

You need to minify css class names in html and css files via grunt or gulp.
For example, from .catalog__item and .catalog__title to .a1 and .a2
That rare case when exactly this is needed.
The only thing I found is CSS Gsub . But he does not know how to work with html-files.

What other packages might fit?
UPD. The reason why this is done is the client's TOR.
I perfectly understand that this will not give any protection and special benefits. And it is impossible to convince the client to do otherwise.
So I'm glad for any advice on how to accomplish this task. Advice to convince the client can not accept.

Answer 1

it ?