Example of generating request (fetch, success, failure) flux actions

actions.js

const REQUEST = 'REQUEST';
const SUCCESS = 'SUCCESS';
const FAILURE = 'FAILURE';

/**
 * Returns request constants (request, success, failure) for a given action
 * @param  {String} action  The request action (e.g. GET_CUSTOMER)
 * @return {object}         Object containing the contstants
 */
function constantsCreator(action) {
  return [REQUEST, SUCCESS, FAILURE].reduce(
    (result, type) => Object.assign({}, result, { [type]: `${action}_${type}` }),
    {}
  );
}

/**
 * Returns an action
 * @param  {String} type         The action type
 * @param  {Object} [payload={}] The action payload
 * @return {Object}              The action
 */
function actionCreator(type, payload = {}) {
  return { type, ...payload };
}

// Create action constants for getCustomer
const GET_CUSTOMER = constantsCreator('GET_CUSTOMER');

// Object of GET_CUSTOMER actions
const customer = {
  request: id => actionCreator(GET_CUSTOMER.REQUEST, { id }),
  success: (id, response) => actionCreator(GET_CUSTOMER.SUCCESS, { id, response }),
  failure: (id, error) => actionCreator(GET_CUSTOMER.FAILURE, { id, error }),
};

export {
  GET_CUSTOMER, // Constants
  customer, // Actions
};