package.json

{
  "name": "temp",
  "version": "1.0.0",
  "description": "",
  "main": "undo-redo-demo.js",
  "author": "",
  "license": "MIT",
  "scripts": {
    "start": "node undo-redo-demo"
  },
  "devDependencies": {
    "immutable": "^3.7.6",
    "redux": "^3.3.1",
    "redux-undo": "^0.6.1"
  },
  "dependencies": {
    "redux-immutable": "^3.0.6"
  }
}

undo-redo-demo.js

var redux = require('redux');
var createStore = redux.createStore;
var Immutable = require('immutable');

var undoable = require('redux-undo').default;
var undo = require('redux-undo').ActionCreators.undo;
var redo = require('redux-undo').ActionCreators.redo;

function reducer(state, action) {
	if (typeof state === 'undefined') {
		return Immutable.Map();
	}
	switch ( action.type ) {
		case 'ADD_VALUE':
			return state.set(action.key, action.value);
		case 'REMOVE_VALUE':
			return state.set(action.key, null);
		default:
			return state;
	}
}

// var combineReducers = require('redux').combineReducers;
var combineReducers = require('redux-immutable').combineReducers;
var rootReducer = combineReducers({
	obj: undoable(reducer)
});

var store = createStore(rootReducer);

store.subscribe(function() {
	console.log(store.getState().get('obj'));
});

var letters = 'abcdefghijklmnopqrstuvwxyz ';
function letter() {
	var index = Math.floor( Math.random() * 27 );
	return Math.random() > 0.5 ?
		letters[index].toUpperCase() :
		letters[index];
}

function arrOfLength(len) {
	var arr = [];
	for (var i = 0; i < len; i++) {
		arr.push(null);
	}
	return arr;
}

function addItem() {
	var val = arrOfLength(10).map(letter).join('');
	return {
		type: 'ADD_VALUE',
		value: val,
		key: letter()
	};
}
function removeItem() {
	var val = (new Array(10)).map(letter);
	return {
		type: 'ADD_VALUE',
		key: letter()
	};
}

console.log(letter());
console.log(addItem());

store.dispatch(addItem());
store.dispatch(addItem());
store.dispatch(undo());
store.dispatch(redo());
store.dispatch(redo());