docs: function inspect (depth, options) {
      // get clone of app
      var obj = _.omit(immutableApp, ['express', 'inspect', 'server'])
      // go through modules and remove the same values
      obj.modules = _.mapValues(obj.modules, obj => {
          return _.omit(obj, ['express', 'immutableApp', 'inspect', 'server'])
      })
      // return object which will be formatted
      return obj
  }