Angular + Typescript Demo Plunk

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <script type="text/javascript" charset="utf-8">
      window.AngularVersionForThisPlunker = 'latest'
    </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/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js/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="https://use.fontawesome.com/fe178087c3.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>

.icon{
    display:inline-block;
    margin-right:3px;
    cursor:pointer;
    color:#ccc;
}
.icon:hover{color:#006dcc;}
.filled {color:#006dcc;}
/* Styles go here */

.icon{
    display:inline-block;
    margin-right:3px;
    cursor:pointer;
    color:#ccc;
}
.icon:hover{color:#006dcc;}
.filled {color:#006dcc;}

### Angular Starter Plunker - Typescript

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/common/http': 'npm:@angular/common' + angularVersion + '/bundles/common-http.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/common/http/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-http-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',
    '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 {RatingStarComponent} from 'ratingstarComponent';

@Component({
  selector: 'my-app',
  template: `
    <div>
      <h2>{{name}}</h2>
      <rating-star max = 10 (onRating) = onRating($event)></rating-star>
      <span>{{selectedRating}}</span>
    </div>
  `,
})
export class App {
  name:string;
  selectedRating : number;
  constructor() {
    this.name = `Rating stars using Angular 4.4.5`
  }
   onRating(rating : number){
    console.log(rating);
    this.selectedRating = rating;
  }
}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App,RatingStarComponent ],
  bootstrap: [ App ]
})
export class AppModule {}

import { Component,Input,Output,EventEmitter  } from '@angular/core';

@Component({
  selector: 'rating-star',
  template: '<div>'
      +'<span class="icon" *ngFor = "let s of maxItem">'
         +'<i [ngClass]=" s <= this.ratedCount ? \'filled\' :\'\'\ " class="fa fa-star"' 
            +'aria-hidden="true" (click)="toggleRating(s)"></i>'
      +'</span>'
    +'</div>',
  styleUrls: ['style.css']
})
export class RatingStarComponent {
 @Input() max: number;
 @Output() onRating = new EventEmitter<Number>();
 maxItem : any[];
 ratedCount : number;
 
 constructor(){
     this.ratedCount = 0;
 }
 
 ngOnInit(){
     this.maxItem = [];
     for(var i=0;i<this.max;i++){
         this.maxItem.push(i+1);
     }
 }
 toggleRating(s:number){
      this.ratedCount = s;
      this.onRating.emit(this.ratedCount);
 }

}