RunKit + npm:

const Nano = require("nano-css") const rule = require('nano-css/addon/rule'); const virtual = require('nano-css/addon/virtual'); const nano = Nano.create(); rule.addon(nano); console.log(nano.rule({'@media print': {display: 'none'}})); virtual.addon(nano); console.log(nano.rule({'@media print': {display: 'none'}}));