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 */

### 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)
  .catch(err => console.log(err));

//our root app component
import { Component, NgModule, OnInit } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { CommonModule } from '@angular/common';
import { ReactiveFormsModule, FormBuilder, FormGroup, FormControl, Validators } from '@angular/forms';
import { CurrencyPipe } from './elements/currency.pipe';
import { CurrencyInputComponent } from './elements/currency-input.component';

@Component({
  selector: 'my-app',
  templateUrl: './src/app.html',
})
export class App implements OnInit {
  form: FormGroup;

  private _amount: number = 100;

  constructor(
    private fb: FormBuilder
  ) { }

  ngOnInit() {
    this.form = this.fb.group({
      amount: [null, [Validators.required]]
    });
    
    this.form.patchValue({amount: this._amount});

    /*
    this.amountControl.valueChanges
      .subscribe((newValue) => {
        if (this._amount !== newValue) {
          this._amount = newValue;
          this.amountControl.patchValue(newValue, {
            emitModelToViewChange: true
          });
        }
      });
    */
  }

  get amountControl() {
    return this.form.get('amount') as FormControl;
  }
}


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

<form [formGroup]="form" name="amountForm" novalidate>
  <app-currency-input
    name="amount"
    class="value-box"
    formControlName="amount"
    required
  ></app-currency-input>
</form>

import { CurrencyPipe } from './currency.pipe';
import { Component, forwardRef, Input } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';

@Component({
  selector: 'app-currency-input',
  templateUrl: './src/elements/currency-input.component.html',
  providers: [
    CurrencyPipe,
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => CurrencyInputComponent),
      multi: true
    }
  ]
})
export class CurrencyInputComponent implements ControlValueAccessor {

  @Input()
  class = '';

  currencyValue: string;

  onChange: (value: number) => void;
  onTouched: () => void;

  constructor(
    private currencyPipe: CurrencyPipe
  ) { }

  parseToNumber(currencyString: string) {
    this.onChange(this.currencyPipe.parse(currencyString));
  }

  transformToCurrencyString(value: number): string {
    return this.currencyPipe.transform(value);
  }

  writeValue(value: number): void {
    if (value !== undefined) {
      this.currencyValue = this.transformToCurrencyString(value);
    }
  }

  registerOnChange(fn: any): void {
    this.onChange = fn;
  }

  registerOnTouched(fn: any): void {
    this.onTouched = fn;
  }

}

<input
  type="text"
  [value]="currencyValue"
  (change)="parseToNumber($event.target.value)"
  [ngClass]="class"
  appCurrency
>

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'currency'
})
export class CurrencyPipe implements PipeTransform {

  /**
   * Transforms plain number input into string with currency formatting
   *
   * @param {(number | string)} value
   * @param {string} currencySymbol
   * @returns {string}
   * @memberof CurrencyPipe
   */
  transform(value: string | number): string {
    return value + ' €';
  }

  /**
   * Parses the number from a given string with currency formatting
   *
   * @param {string} value
   * @returns {number}
   * @memberof CurrencyPipe
   */
  parse(value: string): number {
    return parseFloat(value);
  }

}