Riot API champion concept

champion.js

'use strict'; 

/**
 * A factory for creating access to the riot champion API.
 * @param {http} http The object to send HTTP GET requests with. This is not a node
 * http instance. It must respond to a get method with the signature (region, version, pathname, querystring).
 * @param {String} version The version of the API to query.
 */
function champions(http, version) {
  /**
   * Retrieve all champions from the Riot API.
   * @param {String} region The region to query.
   * @param {Boolean} freeToPlayOnly Indicate whether champions requested should
   * only be free to play champions. Defaults to false.
   * @return {Promise<Champion[]>} Returns a promise representing the current
   * retrieve operation. Upon success, an array of Champions will be resolved.
   */
  function all(region, freeToPlayOnly) {
    return http.get(region, version, '/champion', {
      freeToPlay: freeToPlayOnly
    });
  }

  return {
    all: all
  };
}

module.exports = champions;