@vallemar @NathanWalker Actually, I have already done this before without hackish solutions and I'm quite against using postcss.
See my branch: https://github.com/CatchABus/NativeScript/commits/css-parsers-cleanup/

I believe it's for the best of our interests to switch to css-tree.
This way, we'll use the same parser in build and run time and it also seems to be faster as a parser.