const pipeData = function(fn) {
  return function(data) {
    return Promise.resolve(fn(data)).then(function(res) {
      if (res === void 0) {
        return data;
      }
      const keys = Object.keys(res).filter(function(prop) {
        return res.hasOwnProperty(prop);
      });
      return Promise.all(keys.map(function(prop) {
        return res[prop];
      })).then(function(vals) {
        keys.forEach(function(prop, i) {
          data[prop] = vals[i];
        });
        return data;
      });
    });
  };
};