code: function join(args) {
    var arg;
    var i = 0;
    var path = '';
  
    if (arguments.length === 0) {
      return utils.sep;
    }
  
    while ((arg = arguments[i++])) {
      if (typeof arg !== 'string') {
        throw new TypeError('utils.join() expects string arguments');
      }
  
      path += utils.sep + arg;
    }
  
    path = path.replace(/\/+/g, utils.sep);
    if (path[path.length - 1] === utils.sep) {
      path = path.substring(0, path.length - 1);
    }
    return path;
  }
docs: Join paths.
  
  @param {...String} args Paths
  @returns {String}