Nope for PostCSS

postcss-nope.js

var postcss = require('postcss');

module.exports = postcss.plugin('postcss-nope', function (opts) {
    opts = opts || {};

    return function (css) {
        css.eachDecl(function transformDecl(decl) {
            decl.value = decl.value.replace('nope', 'none');
        });
    };
});