an actionCreator method for redux-thunk that helps you to reduce boilerplate code and creates async actions

thunkAction.js

/** Usage
* 
* file: someAction.js
*
* export const SOMEVAR = 'SOMEVAR';
* 
* export function fetchSomething(callbackOnDone, ...args) {
*   return actionCreator({
*     actionName: SOMEVAR,
*     getResult(data) { return data.someProperty },
*     serviceCallback: myService.postCall,
*     resolveCallback: callbackOnDone,
*   }, ...args);
* }
*
* in the reducer:
*   ...
*   switch(action.type) {
*     case Symbol.for(`REQUEST_${SOMEVAR}`):
*       return {... };
*     case Symbol.for(`FAILED_${SOMEVAR}`):
*       return {... };
*     case Symbol.for(`SUCCEED_${SOMEVAR}`):
*       return {... };
*   }
*   ...
*/


function getDataFromBackend(meta, ...args) {

  return (dispatch) => {
    dispatch(request(meta.actionName));

    return meta.serviceCallback(...args)
      .then(response => response.json())
      .then(data => {
        if ('error' in data) {
          return dispatch(failed(meta.actionName, data.error));
        }
        
        if (meta.resolveCallback) {
          meta.resolveCallback();
        }
        return dispatch(succeed(meta.actionName, meta.getResult(data)));
      },
        (error) => dispatch(failed(meta.actionName, error.toString()))
      );
  }
}

function request(actionName) {
  return { type: Symbol.for(`REQUEST_${actionName}`) };
}

function failed(actionName, errorMsg) {
  return { type: Symbol.for(`FAILED_${actionName}`), error: errorMsg };
}

function succeed(actionName, data) {
  return { type: Symbol.for(`SUCCEED_${actionName}`), data };
}

/**
 * @typedef {Object} Meta
 * @property {Function} serviceCallback
 * @property {Function} getResult
 * @property {string} actionName
 * @property {Function} [resolveCallback]
 * 
 * 
 * @param {Meta} meta 
 * @param  {...any} args 
 * @return {Function}
 */
export default (meta, ...args) => {
  Symbol(`REQUEST_${meta.actionName}`);
  Symbol(`FAILED_${meta.actionName}`);
  Symbol(`SUCCEED_${meta.actionName}`);

  return getDataFromBackend(meta, ...args);
}