code: function raiseOnUnsafeCSS() {
      var css = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : '';
      var foundInName = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '\'not provided\'';
  
      css = new _cleanCss2.default({
        shorthandCompacting: false
      }).minify(css).styles;
      if (css.match(/-moz-binding/i)) {
        throw new Error('Unsafe CSS found in ' + foundInName + ': "-moz-binding"');
      } else if (css.match(/expression/i)) {
        throw new Error('Unsafe CSS found in ' + foundInName + ': "expression"');
      }
      return css;
    }
docs: Validate against common CSS vulnerabilities.