https://www.npmjs.com/package/css-tree
https://en.wikipedia.org/wiki/Abstract_syntax_tree
http://iamdustan.com/reworkcss_ast_explorer/
https://github.com/reworkcss/css
https://code.visualstudio.com/Docs/editor/debugging
https://github.com/ramda/ramda/wiki/What-Function-Should-I-Use%3F