How to use the @stencil/core.Ionic.controller function in @stencil/core

comments(story: any) {
    if (Ionic.isServer) return;

    Ionic.controller('loading', { content: 'fetching comments...' }).then(loading => {
      loading.present();

      this.fakeFetch(`${this.apiRootUrl}/item/${story.id}`).then((data: { [key: string]: any }) => {
        setTimeout(() => {
          loading.dismiss().then(() => {
            Ionic.controller('modal', { component: 'comments-page', componentProps: { comments: data.comments, storyId: story.id } }).then(modal => {
              console.log('modal created');

              modal.present().then(() => {
                console.log('modal finished transitioning in, commments: ', modal.componentProps.comments);
              });
            });
          });
        }, 300);
      });

previous() {
    if (this.page > 1) {

      Ionic.controller('loading', { content: `fetching articles...` }).then(loading => {
        loading.present().then(() => {

          this.page = this.page--;
          console.log(this.page--);

          this.fakeFetch(`${this.apiRootUrl}/${this.pageType}?page=${this.page}`).then((data) => {
            this.stories = data;

            loading.dismiss();
          });

        });
      });
    } else {
      window.navigator.vibrate(200);
    }

next() {
    Ionic.controller('loading', { content: `fetching articles...` }).then(loading => {
      loading.present().then(() => {

        this.page = this.page++;
        console.log(this.page++);

        this.fakeFetch(`${this.apiRootUrl}/${this.pageType}?page=${this.page}`).then((data) => {
          if (data.length !== 0) {
            this.stories = data;
          }
          loading.dismiss();
        });

      });
    });
  }

loading.dismiss().then(() => {
            Ionic.controller('modal', { component: 'comments-page', componentProps: { comments: data.comments, storyId: story.id } }).then(modal => {
              console.log('modal created');

              modal.present().then(() => {
                console.log('modal finished transitioning in, commments: ', modal.componentProps.comments);
              });
            });
          });
        }, 300);

break;
      case 'jobs':
        this.thirdSelectedClass = true;
        this.firstSelectedClass = false;
        this.fourthSelectedClass = false;
        this.secondSelectedClass = false;
        break;
      case 'ask':
        this.fourthSelectedClass = true;
        this.thirdSelectedClass = false;
        this.secondSelectedClass = false;
        this.firstSelectedClass = false;
        break;
    }

    Ionic.controller('loading', { content: `fetching ${type} articles...` }).then((loading: any) => {
      loading.present().then(() => {

        this.fakeFetch(`${this.apiRootUrl}/${type}?page=1`).then((data) => {
          this.stories = data;

          loading.dismiss();
        });

        this.pageType = type;

      });
    });
  }