How to use the react-redux-firebase.dataToJS function in react-redux-firebase

export const getUserData = state => {
  const userId = getUserId(state);
  const gameId = getGameId(state);
  return userId && gameId && dataToJS(state.firebase, `games/${gameId}/merchants/${userId}`);
};

export const getGameData = state => {
  const gameId = getGameId(state);
  return gameId && dataToJS(state.firebase, `games/${gameId}`);
};

export const getRoomData = state => {
  return dataToJS(state.firebase, 'rooms');
};

const mapStateToProps = (state) => ({
  userId: getUserId(state),
  playerMap: getPlayerMap(state),
  historyRef: dataToJS(state.firebase, `gameLog/${state.game.id}`)
})

const mapStateToProps = ({ firebase }) => ({
  schedules: dataToJS(firebase, 'schedules'),
});