How to use the topcoder-react-lib.reducers.auth function in topcoder-react-lib

export function factory(req) {
  const options = {
    auth: getAuthTokens(req),
    mergeReducers: {
      [communityActions.tcCommunity.joinDone]: (state, { payload }) => ({
        ...state,
        profile: {
          ...state.profile,
          groups: state.profile.groups.concat({ id: payload.groupId.toString() }),
        },
      }),
    },
  };

  return reducers.auth.factory(options);
}