hello_world.ts

@Component({
    selector: 'hello-world',
    template: `<input #input (keydown)="updateModel(input.value)">{{model.message}}`
})
export class HelloWorld {

    model = {
        message: 'Hello World !'
    };

    updateModel(newMessage) {
        this.model.message = '';
    }

}

bootstrap(HelloWorld);