Naive implementation of ifFeatureFlagDirective

featureFlag.ts

@Directive({
  selector: '[ifFeature]',
})
export class IfFeatureFlagDirective<IfTemplate, ElseTemplate> {
  // assume flags, viewContainerRef, TemplateRef ... 
   
  @Input('ifFeature')
  set ifFeature(f: string) {
    if(this.flags[f]) {
      this.viewContainerRef.createEmbeddedView(this.template);
    } else {
      this.viewContainerRef.clear();
    }
  }
}