<div [ngSwitch]="variant.type">
            <div *ngSwitchCase="'typeA'">
                <typeAComponent></typeAComponent>
            </div>
            <div *ngSwitchCase="'typeB'">
                <typeBComponent></typeBComponent>
            </div>
            <div *ngSwitchCase="'typeC'">
                <typeCComponent></typeCComponent>
            </div>
     </div>

$myClassName = 'myClass';
 $instance = new $myClassName();

//inject the component factory resolver
   constructor(private componentFactoryResolver:ComponentFactoryResolver){}

   //accept a component and a viewContainerRef (where you want to load the component)
     loadComponent(component:Type, target:ViewContainerRef){
      let componentFactory =    this.componentFactoryResolver.resolveComponentFactory(component);
      target.createComponent(componentFactory);
    }