Class QueryDir

packages/core/test/acceptance/authoring/signal_queries_spec.ts:326–341

    it('should run content queries defined on directives', () => {
      @Directive({
        selector: '[query]',
        host: {'[textContent]': `noOfEls()`},
      })
      class QueryDir {
        elements = contentChildren('el');
        element = contentChild('el');
        elementReq = contentChild.required('el');

        noOfEls = computed(
          () =>
            this.elements().length +
            (this.element() !== undefined ? 1 : 0) +
            (this.elementReq() !== undefined ? 1 : 0),
        );
      }

      @Component({
        imports: [QueryDir],