is-monitor/is-monitor-frontend/src/app/resource-types-tree/resource-types-tree.component.html

<ul id="resource-tree" class="list-group">
  <ng-template #recursiveList let-resources>
    <li *ngFor="let type of resources" class="list-group-item">
      <a class="nav-link" href="#" [title]="type.description" (click)="loadResources(type.name)">{{ type.name }}</a>
      <ul *ngIf="type.children.length > 0">
        <ng-container *ngTemplateOutlet="recursiveList; context:{ $implicit: type.children }"></ng-container>
      </ul>
    </li>
  </ng-template>
  <ng-container *ngTemplateOutlet="recursiveList; context:{ $implicit: resources }"></ng-container>
</ul>