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configurable-async-reducer.js

export const createAsyncReducer = (type, reducers = {}) => {
  let defaultReducers = {
    loading: (state = false, action) => {
      if (action.type === type) {
        return action.readyState === REQUEST;
      }
      return state;
    },
    data: (state = null, action) => {
      if (action.type === type) {
        return action.data;
      }
      return state;
    },
    error: (state = null, action) => {
      if (action.type === type) {
        return action.error;
      }
      return state;
    },
  };

  return combineReducers(Object.assign({}, defaultReducers, reducers));
};