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="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 */

.selected{
  color:red;
}

### 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/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',
    '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 { ReactiveFormsModule, FormGroup, FormBuilder } from "@angular/forms";
import { Selected } from './selected.directive';

@Component({
  selector: 'my-app',
  template: `
  <form [formGroup]="form">
    <div>
      <input type='radio' selected [control]="form.get('checkbox')" formControlName='checkbox' value='1'> Check 1
    </div>
    <div>  
      <input type='radio' selected [control]="form.get('checkbox')" formControlName='checkbox' value='2'> Check 2
    </div>
  </form>
  `,
})
export class App {
  
  private form:FormGroup;
  
  constructor(private formBuilder:FormBuilder) {
    
  }
  
  ngOnInit(){
    this.form = this.formBuilder.group({
      checkbox:['']
    })
  }
}

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

import {Directive, OnChanges, Input, ElementRef} from '@angular/core';
import {FormControl} from "@angular/forms";
import 'rxjs/Rx';

@Directive({selector: 'input[selected]'})
export class Selected implements OnChanges {
    constructor(private element:ElementRef) {}

    //instance of FormControl this radio btn belongs to
    @Input() control:FormControl;

    //Once a FormControl is bound, start listening to its changes
    //Once a change occurs, call manageClass and provide it the new value
    ngOnChanges(){
        this.control.valueChanges.subscribe(newVal=>this.manageClass(newVal));
    }

    //Compares the control's new value to the "value" property of the DOM radio btn
    //If they match, it means the radio btn is currently selected. Set/remove classes
    manageClass(newVal){
        let e = this.element.nativeElement;
        if(e.value===newVal) e.parentElement.classList.add('selected');
        else e.parentElement.classList.remove('selected');
    }
}