Persisting State to localStorage Redux React

localStorage.js

import throttle from 'lodash/throttle';

export const loadState = () => {
  try {
      const serializedState = localStorage.getItem('state');
      if(serializedState === null) ? return undefined : return JSON.parse(serializedState)
} 
  catch(err) {
      return undefined
};
  
  
export const saveState = state => {
  try {
      const serializedState = JSON.stringify(state);
      localStorage.setItem('state', serializedState);
  }
  catch(err) {
      //manage errors
    console.log(err)
}

};
  
  
/*
remember to subscribe to store and save State e.g only. Throttle prevents the localstorage being overly updated
and adding a callback timer limits this to every 1 sec

store.subscribe(throttle(() => {
  saveState({
    todos: store.getState().todos
   });
},1000));

const persistedState = loadState();
const store = createStore(
  todoApp,
  persistedState
);

*/