How to work with props if you use immutable js in conjunction with redux?

Question

React

Let's say there is a store

const initState = Immutable.fromJS({
  data: [],
});

export default function reducer(state = initState, action) {
  switch (action.type) {
    case actions.SET_DATA: {
      const { payload } = action;
      return state.merge({ data: payload })
}

there is a component

const Component = (props) => {
const { data } = props;
   return {
      <div> data </div>
    }
}
const mapStateToProps = (state) => {
   data: state.data || state.data.toJS()
}
Component.defaultValue = {
data: ??????
}

What is better to write in defaultValue and is it worth using the toJS() method for state props to convert immutable SET and MAP into regular arrays and objects?