Extract State Logic to Redux require is not defined error

1

I am trying to run below code on challenge
section but it is giving me error

Blockquote

require is not defined

Blockquote

while i did not use require any where.

Code:

import React from 'react';
import { createStore } from 'redux'
// define ADD, addMessage(), messageReducer(), and store here:
const ADD = 'ADD';
function addMessage(message) {
  return {
    type: ADD,
    message
  };
};
const initital_state = {
  message:[]
};
function messageReducer(state=initital_state, action) {
  switch(action.type){
    case ADD: return Object.assign({}, state, {
        message: action.message
      });
    default: return state;
  }
}

const store = createStore(messageReducer);

store.dispatch(addMessage('hello'));