Sometimes reducers get kind of messy:

const initialState = {

    notificationBar: {

        open: false,

    },

};



export default function (state = initialState, action) {

  switch (action.type) {

    case actions.LAYOUT_NOTIFICATIONBAR_OPEN:

      return Object.assign({}, state, {

        // TODO: Find a cleaner way to do this!

        notificationBar: Object.assign({}, state.notificationBar, {

          open: true,

        }),

      });

    default:

      return state;

  }

}

Is there a more terse way to do this?