bigbuffet-rw/app/soapbox/reducers/soapbox.js

import {
  SOAPBOX_CONFIG_REQUEST_SUCCESS,
  SOAPBOX_CONFIG_REQUEST_FAIL,
} from '../actions/soapbox';
import { Map as ImmutableMap, fromJS } from 'immutable';

const initialState = ImmutableMap();

const defaultState = ImmutableMap({
  brandColor: '#0482d8', // Azure
});

export default function soapbox(state = initialState, action) {
  switch(action.type) {
  case SOAPBOX_CONFIG_REQUEST_SUCCESS:
    return defaultState.merge(ImmutableMap(fromJS(action.soapboxConfig)));
  case SOAPBOX_CONFIG_REQUEST_FAIL:
    return defaultState;
  default:
    return state;
  }
};