@ricepuddin/redux-segment/examples/react-redux/src/middleware/promiseMiddleware.js

Segment.io analytics integration for redux.

import isPromise from '../utils/isPromise';

export default function promiseMiddleware({ dispatch }) {
  return next => action => {
    if (!isPromise(action.payload)) {
      return next(action);
    }

    const { types, payload, meta } = action;
    const { promise, data } = payload;
    const [ PENDING, FULFILLED, REJECTED ] = types;

   /**
    * Dispatch the pending action
    */
    dispatch({
      type: PENDING,
      ...data && { payload: data },
      ...meta && { meta },
    });

    /**
     * If successful, dispatch the fulfilled action, otherwise dispatch
     * rejected action.
     */
    return promise.then(
      result => {
        dispatch({
          type: FULFILLED,
          payload: result,
          meta,
        });
      },
      error => {
        dispatch({
          type: REJECTED,
          payload: error,
          meta,
        });
      }
    );
  };
}