text: 'use strict';
  
  var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
  
  var clone = require('../helpers/clone');
  
  module.exports = function concat(collectionOrArrayOrObject) {
    var list = collectionOrArrayOrObject;
  
    if (collectionOrArrayOrObject instanceof this.constructor) {
      list = collectionOrArrayOrObject.all();
    } else if ((typeof collectionOrArrayOrObject === 'undefined' ? 'undefined' : _typeof(collectionOrArrayOrObject)) === 'object') {
      list = [];
      Object.keys(collectionOrArrayOrObject).forEach(function (property) {
        list.push(collectionOrArrayOrObject[property]);
      });
    }
  
    var collection = clone(this.items);
  
    list.forEach(function (item) {
      if ((typeof item === 'undefined' ? 'undefined' : _typeof(item)) === 'object') {
        Object.keys(item).forEach(function (key) {
          return collection.push(item[key]);
        });
      } else {
        collection.push(item);
      }
    });
  
    return new this.constructor(collection);
  };