docs: function createModuleReducer(reducers) {
    var _reducersType = t.nullable(t.ref(ReducerDictionaryType$1));
  
    t.param('reducers', _reducersType).assert(reducers);
    return reducers ? redux.combineReducers(reducers) : function () {
      var state = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
      return state;
    };
  }