text: 'use strict';
  
  var alphabet = require('./alphabet');
  var build = require('./build');
  var isValid = require('./is-valid');
  
  // if you are using cluster or multiple servers use this to make each instance
  // has a unique value for worker
  // Note: I don't know if this is automatically set when using third
  // party cluster solutions such as pm2.
  var clusterWorkerId = require('./util/cluster-worker-id') || 0;
  
  /**
   * Set the seed.
   * Highly recommended if you don't want people to try to figure out your id schema.
   * exposed as shortid.seed(int)
   * @param seed Integer value to seed the random alphabet.  ALWAYS USE THE SAME SEED or you might get overlaps.
   */
  function seed(seedValue) {
      alphabet.seed(seedValue);
      return module.exports;
  }
  
  /**
   * Set the cluster worker or machine id
   * exposed as shortid.worker(int)
   * @param workerId worker must be positive integer.  Number less than 16 is recommended.
   * returns shortid module so it can be chained.
   */
  function worker(workerId) {
      clusterWorkerId = workerId;
      return module.exports;
  }
  
  /**
   *
   * sets new characters to use in the alphabet
   * returns the shuffled alphabet
   */
  function characters(newCharacters) {
      if (newCharacters !== undefined) {
          alphabet.characters(newCharacters);
      }
  
      return alphabet.shuffled();
  }
  
  /**
   * Generate unique id
   * Returns string id
   */
  function generate() {
    return build(clusterWorkerId);
  }
  
  // Export all other functions as properties of the generate function
  module.exports = generate;
  module.exports.generate = generate;
  module.exports.seed = seed;
  module.exports.worker = worker;
  module.exports.characters = characters;
  module.exports.isValid = isValid;
  