docs: function CLIEngine(options) {
  
    /**
     * Stored options for this instance
     * @type {Object}
     */
    this.options = assign(Object.create(defaultOptions), options || {});
  
    // load in additional rules
    if (this.options.rulePaths) {
      this.options.rulePaths.forEach(function(rulesdir) {
        rules.load(rulesdir);
      });
    }
  }