example of ngrx with immutable and angular

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <script type="text/javascript" charset="utf-8">
      window.AngularVersionForThisPlunker = '4.3.0'
    </script>
    <title>angular playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js@0.8.12/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js@0.8.12/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

/* Styles go here */

### Angular Starter Plunker - Typescript
plus immutable.js, ngrx

var angularVersion;
if(window.AngularVersionForThisPlunker === 'latest'){
  angularVersion = ''; //picks up latest
}
else {
  angularVersion = '@' + window.AngularVersionForThisPlunker;
}

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    '@angular/core': 'npm:@angular/core'+ angularVersion + '/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common' + angularVersion + '/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler' + angularVersion  + '/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http' + angularVersion + '/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router' + angularVersion +'/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms' + angularVersion + '/bundles/forms.umd.js',
    '@angular/animations': 'npm:@angular/animations' + angularVersion + '/bundles/animations.umd.js',
    '@angular/platform-browser/animations': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-animations.umd.js',
    '@angular/animations/browser': 'npm:@angular/animations' + angularVersion + '/bundles/animations-browser.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core' + angularVersion + '/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler' + angularVersion + '/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http' + angularVersion + '/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router' + angularVersion + '/bundles/router-testing.umd.js',
    '@ngrx/store': 'https://npmcdn.com/@ngrx/store@5.1.0',
    'immutable': 'npm:immutable@latest',
    'tslib': 'npm:tslib@1.6.1',
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.2.1/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, NgModule, VERSION} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {FirstComponent} from './first.component'
import {SecondComponent} from './second.component'
import {ThirdComponent} from './third.component'
import { StoreModule } from '@ngrx/store';
import { reducers, metaReducers } from './reducers';

@Component({
  selector: 'my-app',
  template: `
    <first-component></first-component>
    <second-component></second-component>
    <third-component></third-component>
  `,
})
export class App {
  constructor() {
  }
}

@NgModule({
  imports: [ BrowserModule,
        StoreModule.forRoot(reducers, { metaReducers })],
  declarations: [ App, FirstComponent, SecondComponent, ThirdComponent ],
  bootstrap: [ App ]
})
export class AppModule {}

//messages reducer
import {List, Record} from 'immutable';
import * as _state from './messages.state';

export const ADD_MESSAGE = 'ADD_MESSAGE';
export const DELETE_MESSAGE = 'DELETE_MESSAGE';

export interface IMessage {
  id: number,
  text: string
}

const messageRecord = Record({
  id: null,
  text: null
});

export class Message extends messageRecord implements IMessage {
  id: string;
  text: string;
  constructor(config: IMessage) {
    super(config);
  }
}

export const reducer = (state: State = _state.initialState, {type, payload}) => {
  
  switch(type){
    case ADD_MESSAGE:
      state = state
        .set('datetime', new Date().toString());
      
      state = state
        .updateIn(['messages'],
          (list = List([])) => list.push(new Message(payload)));
    break;
      
    case DELETE_MESSAGE:
      state = state.filter(m => m.id !== payload.id);
    break;
  
    default:
    break;
  }
  return state;
}

export const getMessages = (state: State) => state.messages;
export const getLastUpdated = (state: State) => state.datetime;

import {Component} from '@angular/core'
import * as MessagesActions from './messages';
import {Store} from '@ngrx/store'

@Component({
  selector: 'first-component',
  template: '<h1>First Component (Sender)</h1><button (click)="onClick()">Send Message</button>'
})
export class FirstComponent {
  clickCount = 1;
  constructor(private store:Store) {
  }
  
  onClick() {
    this.store.dispatch({
      type: MessagesActions.ADD_MESSAGE,
      payload: {id: this.clickCount, text: this.clickCount + " - hello "}
    });
    this.clickCount = this.clickCount + 1;
  }
}

import {Component} from '@angular/core'
import * as MessagesActions from './messages';
import {Store, select} from '@ngrx/store'
import * as fromRoot from './reducers';

@Component({
  selector: 'second-component',
  template: '<h1>Last Updated (Receiver)</h1><div>{{(messagesObservable | async)}}</div>'
})
export class SecondComponent {
  messagesObservable: Observable<List<Message>>;
  
  constructor(private store:Store) {
    this.messagesObservable = this.store.pipe(select(fromRoot.getMessageTime));
    // this.showSidenav$ = this.store.pipe(select(fromRoot.getShowSidenav));
    this.messagesObservable.subscribe(data => {
      
    });
  }
  
  ngOnDestroy() {
   this.messagesObservable.unsubscribe(); 
  }
}

import {Component} from '@angular/core'
import * as MessagesActions from './messages';
import {Store, select} from '@ngrx/store'
import * as fromRoot from './reducers';

@Component({
  selector: 'third-component',
  template: '<h2>Third Component (Receiver)</h2><div *ngFor="let data of (messagesObservable | async)">{{data?.text}}</div>'
})
export class ThirdComponent {
  messagesObservable: Observable<List<Message>>;

  constructor(private store:Store) {
    this.messagesObservable = store.pipe(select(fromRoot.getMessages));
    this.messagesObservable.subscribe(data => {
      
    });
  }
  
  ngOnDestroy() {
   this.messagesObservable.unsubscribe(); 
  }
}

import * as fromMessages from './messages';
import {
  ActionReducerMap,
  createSelector,
  createFeatureSelector,
  ActionReducer,
  MetaReducer,
} from '@ngrx/store';

export interface State {
  messages: fromMessages.State;
 }

export const reducers: ActionReducerMap<State> = {
  messages: fromMessages.reducer
};

export function logger(reducer: ActionReducer<State>): ActionReducer<State> {
  return function(state: State, action: any): State {
    console.log('state', state);
    console.log('action', action);

    return reducer(state, action);
  };
}

export const metaReducers: MetaReducer<State>[] = [logger];
  
export const getMessagesState = createFeatureSelector<fromMessages.State>('messages');

export const getMessageTime = createSelector(
  getMessagesState,
  fromMessages.getLastUpdated
);

export const getMessages = createSelector(
  getMessagesState,
  fromMessages.getMessages
);

import {List, Record} from 'immutable';

interface IState {
  messages: IMessage[],
  datetime: string,
}

const stateRecord = Record({
  messages: List([]),
  datetime: null
});

export class State extends stateRecord implements State {
  messages: List<Message>;
  datetime: string;
  constructor(config: IState) {
    super(Object.assign({}, config, {
      messages: config.messages && List(config.messages.map(m => new Message(m))),
    }));
  }
}

export const initialState = new State({
  messages: [],
  datetime: undefined
});