Erro

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no main.ts
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import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import {
  FormsModule,
  ReactiveFormsModule
} from '@angular/forms';

import { AppComponent }  from './app.component';

@NgModule({
  declarations: [
    AppComponent
    // ... our declarations here
  ],
  imports: [
    BrowserModule,
    FormsModule,         // <-- add this
    ReactiveFormsModule  // <-- and this
  ],
  bootstrap: [ AppComponent ]
})
class FormsDemoAppModule {}


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no app.component.ts
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import { Component } from '@angular/core';
@Component({
  selector: 'my-app',
  template: `
  <div class="ui raised segment">
    <h2 class="ui header">Demo Form: Sku</h2>
    <form #f="ngForm"
          (ngSubmit)="onSubmit(f.value)"
          class="ui form">

      <div class="field">
        <label for="skuInput">SKU</label>
        <input type="text"
               id="skuInput"
               placeholder="SKU"
               name="sku" ngModel>
      </div>

      <button type="submit" class="ui button">Submit</button>
    </form>
  </div>
  `
 })

export class AppComponent {
  onSubmit(form: any): void {
    console.log('you submitted value:', form);
  }
}


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no index.html
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<!DOCTYPE html>
<html>
    <head>
        <script src="node_modules/core-js/client/shim.min.js"></script>
        <script src="node_modules/zone.js/dist/zone.js"></script>
        <script src="node_modules/reflect-metadata/Reflect.js"></script>
        <script src="node_modules/systemjs/dist/system.src.js"></script>
        <script src="systemjs.config.js"></script>
        <script type="text/javascript">
            System.import('app').catch(console.log.bind(console));
        </script>
    </head>
    <body>
        <my-app></my-app>
    </body>
</html>