Basic Redux in node

const redux = require("redux");

const createStore = redux.createStore;

const initialState = {
  counter: 0,
};

//reducer
const reducer = (state = initialState, action) => {
  const { type } = action;
  switch (type) {
    case "ADD_COUNTER": {
      return {
        ...state,
        counter: +1,
      };
    }
    default:
      return state;
  }
};

//Store
const store = createStore(reducer);

// Dispatching action
const ADD_COUNTER = {
  type: "ADD_COUNTER",
};

//Subcription
store.subscribe(() => {
  const letestState = store.getState();
  console.log(letestState);
});

store.dispatch({ type: "ADD_COUNTER" });