code: function flip(str, options) {
    if (typeof str != 'string') {
      throw new Error('input is not a String.');
    }
  
    var node = css.parse(str, options);
  
    flipNode(node.stylesheet);
  
    return css.stringify(node, options);
  }
docs: BiDi flip a CSS string.
  
  @param {String} str
  @param {Object} [options]
  @param {Boolean} [options.compress] Whether to slightly compress output.
  Some newlines and indentation are removed. Comments stay intact.
  @param {String} [options.indent] Default is `'  '` (two spaces).
  @returns {String}