text: module.exports = {
      filter: require('./filter/filter'),
      flatten: require('./flatten/flatten'),
      map: require('./map/map'),
      limit: require('./limit/limit'),
      sort: require('./sort/sort'),
      skip: require('./skip/skip'),
      distinct: require('./distinct/distinct'),
      effect: require('./effect/effect'),
      takeWhile: require('./takeWhile/takeWhile'),
      concat: require('./concat/concat'),
      skipWhile: require('./skipWhile/skipWhile'),
  };
  