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naive-async-reducer.js

// helpers/async.js
import { combineReducers } from 'redux';

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

  return combineReducers({ loading, data, error });
};