redux-utils - reducer without utils

reducers.js

const layoutDefState = {
 isEditorExpanded: false,
 direction:"horizontal"
}
function layout(state=layoutDefState, action) {

switch (action.type){
 case ACT.LAYOUT_TOOGLE_EDITOR_EXPANDED:
   return {
     …state,
     isEditorExpanded: !state.isEditorExpanded
   }
 case ACT.LAYOUT_TOOGLE_DIRECTION:
   console.log(‘layout’, action.type);
   return {
     …state,
     direction: (
       state.direction === ‘vertical’
       ? ‘horizontal’
       : ‘vertical’
     ) 
   }
 default:
   return state
 }
}